gl_backend.c

   1
   2 #include "quakedef.h"
   3 #include "cl_collision.h"
   4
   5 #define MAX_RENDERTARGETS 4
   6
   7 cvar_t gl_debug = {CVAR_CLIENT, "gl_debug", "0", "enables OpenGL debug output, 0 = off, 1 = HIGH severity only, 2 = also MEDIUM severity, 3 = also LOW severity messages.  (note: enabling may not take effect until vid_restart on some drivers)"};
   8 cvar_t gl_paranoid = {CVAR_CLIENT, "gl_paranoid", "0", "enables OpenGL error checking and other tests"};
   9 cvar_t gl_printcheckerror = {CVAR_CLIENT, "gl_printcheckerror", "0", "prints all OpenGL error checks, useful to identify location of driver crashes"};
  10
  11 cvar_t r_render = {CVAR_CLIENT, "r_render", "1", "enables rendering 3D views (you want this on!)"};
  12 cvar_t r_renderview = {CVAR_CLIENT, "r_renderview", "1", "enables rendering 3D views (you want this on!)"};
  13 cvar_t r_waterwarp = {CVAR_CLIENT | CVAR_SAVE, "r_waterwarp", "1", "warp view while underwater"};
  14 cvar_t gl_polyblend = {CVAR_CLIENT | CVAR_SAVE, "gl_polyblend", "1", "tints view while underwater, hurt, etc"};
  15
  16 cvar_t v_flipped = {CVAR_CLIENT, "v_flipped", "0", "mirror the screen (poor man's left handed mode)"};
  17 qboolean v_flipped_state = false;
  18
  19 r_viewport_t gl_viewport;
  20 matrix4x4_t gl_modelmatrix;
  21 matrix4x4_t gl_viewmatrix;
  22 matrix4x4_t gl_modelviewmatrix;
  23 matrix4x4_t gl_projectionmatrix;
  24 matrix4x4_t gl_modelviewprojectionmatrix;
  25 float gl_modelview16f[16];
  26 float gl_modelviewprojection16f[16];
  27 qboolean gl_modelmatrixchanged;
  28
  29 #ifdef DEBUGGL
  30 int gl_errornumber = 0;
  31
  32 void GL_PrintError(int errornumber, const char *filename, int linenumber)
  33 {
  34         switch(errornumber)
  35         {
  36 #ifdef GL_INVALID_ENUM
  37         case GL_INVALID_ENUM:
  38                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  39                 break;
  40 #endif
  41 #ifdef GL_INVALID_VALUE
  42         case GL_INVALID_VALUE:
  43                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  44                 break;
  45 #endif
  46 #ifdef GL_INVALID_OPERATION
  47         case GL_INVALID_OPERATION:
  48                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  49                 break;
  50 #endif
  51 #ifdef GL_STACK_OVERFLOW
  52         case GL_STACK_OVERFLOW:
  53                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  54                 break;
  55 #endif
  56 #ifdef GL_STACK_UNDERFLOW
  57         case GL_STACK_UNDERFLOW:
  58                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  59                 break;
  60 #endif
  61 #ifdef GL_OUT_OF_MEMORY
  62         case GL_OUT_OF_MEMORY:
  63                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  64                 break;
  65 #endif
  66 #ifdef GL_TABLE_TOO_LARGE
  67         case GL_TABLE_TOO_LARGE:
  68                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  69                 break;
  70 #endif
  71 #ifdef GL_INVALID_FRAMEBUFFER_OPERATION
  72         case GL_INVALID_FRAMEBUFFER_OPERATION:
  73                 Con_Printf("GL_INVALID_FRAMEBUFFER_OPERATION at %s:%i\n", filename, linenumber);
  74                 break;
  75 #endif
  76         default:
  77                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  78                 break;
  79         }
  80 }
  81
  82 static void GLAPIENTRY GL_DebugOutputCallback(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* message, const GLvoid* userParam)
  83 {
  84         const char *sev = "ENUM?", *typ = "ENUM?", *src = "ENUM?";
  85         switch (severity)
  86         {
  87         case GL_DEBUG_SEVERITY_LOW_ARB: sev = "LOW"; break;
  88         case GL_DEBUG_SEVERITY_MEDIUM_ARB: sev = "MED"; break;
  89         case GL_DEBUG_SEVERITY_HIGH_ARB: sev = "HIGH"; break;
  90         }
  91         switch (type)
  92         {
  93         case GL_DEBUG_TYPE_ERROR_ARB: typ = "ERROR"; break;
  94         case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR_ARB: typ = "DEPRECATED"; break;
  95         case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR_ARB: typ = "UNDEFINED"; break;
  96         case GL_DEBUG_TYPE_PORTABILITY_ARB: typ = "PORTABILITY"; break;
  97         case GL_DEBUG_TYPE_PERFORMANCE_ARB: typ = "PERFORMANCE"; break;
  98         case GL_DEBUG_TYPE_OTHER_ARB: typ = "OTHER"; break;
  99         }
 100         switch (source)
 101         {
 102         case GL_DEBUG_SOURCE_API_ARB: src = "API"; break;
 103         case GL_DEBUG_SOURCE_SHADER_COMPILER_ARB: src = "SHADER"; break;
 104         case GL_DEBUG_SOURCE_WINDOW_SYSTEM_ARB: src = "WIN"; break;
 105         case GL_DEBUG_SOURCE_THIRD_PARTY_ARB: src = "THIRDPARTY"; break;
 106         case GL_DEBUG_SOURCE_APPLICATION_ARB: src = "APP"; break;
 107         case GL_DEBUG_SOURCE_OTHER_ARB: src = "OTHER"; break;
 108         }
 109         Con_Printf("GLDEBUG: %s %s %s: %u: %s\n", sev, typ, src, (unsigned int)id, message);
 110 }
 111 #endif
 112
 113 #define BACKENDACTIVECHECK if (!gl_state.active) Sys_Error("GL backend function called when backend is not active");
 114
 115 void SCR_ScreenShot_f(cmd_state_t *cmd);
 116
 117 typedef struct gltextureunit_s
 118 {
 119         int pointer_texcoord_components;
 120         int pointer_texcoord_gltype;
 121         size_t pointer_texcoord_stride;
 122         const void *pointer_texcoord_pointer;
 123         const r_meshbuffer_t *pointer_texcoord_vertexbuffer;
 124         size_t pointer_texcoord_offset;
 125
 126         rtexture_t *texture;
 127         int t2d, t3d, tcubemap;
 128         int arrayenabled;
 129 }
 130 gltextureunit_t;
 131
 132 typedef struct gl_state_s
 133 {
 134         int cullface;
 135         int cullfaceenable;
 136         int blendfunc1;
 137         int blendfunc2;
 138         qboolean blend;
 139         GLboolean depthmask;
 140         int colormask; // stored as bottom 4 bits: r g b a (3 2 1 0 order)
 141         int depthtest;
 142         int depthfunc;
 143         float depthrange[2];
 144         float polygonoffset[2];
 145         qboolean alphatocoverage;
 146         int scissortest;
 147         unsigned int unit;
 148         gltextureunit_t units[MAX_TEXTUREUNITS];
 149         float color4f[4];
 150         int lockrange_first;
 151         int lockrange_count;
 152         int vertexbufferobject;
 153         int elementbufferobject;
 154         int uniformbufferobject;
 155         int framebufferobject;
 156         int defaultframebufferobject; // deal with platforms that use a non-zero default fbo
 157         qboolean pointer_color_enabled;
 158
 159         // GL3.2 Core requires that we have a GL_VERTEX_ARRAY_OBJECT, but... just one.
 160         unsigned int defaultvao;
 161
 162         int pointer_vertex_components;
 163         int pointer_vertex_gltype;
 164         size_t pointer_vertex_stride;
 165         const void *pointer_vertex_pointer;
 166         const r_meshbuffer_t *pointer_vertex_vertexbuffer;
 167         size_t pointer_vertex_offset;
 168
 169         int pointer_color_components;
 170         int pointer_color_gltype;
 171         size_t pointer_color_stride;
 172         const void *pointer_color_pointer;
 173         const r_meshbuffer_t *pointer_color_vertexbuffer;
 174         size_t pointer_color_offset;
 175
 176         void *preparevertices_tempdata;
 177         size_t preparevertices_tempdatamaxsize;
 178         int preparevertices_numvertices;
 179
 180         memexpandablearray_t meshbufferarray;
 181
 182         qboolean active;
 183 }
 184 gl_state_t;
 185
 186 static gl_state_t gl_state;
 187
 188
 189 /*
 190 note: here's strip order for a terrain row:
 191 0--1--2--3--4
 192 |\ |\ |\ |\ |
 193 | \| \| \| \|
 194 A--B--C--D--E
 195 clockwise
 196
 197 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
 198
 199 *elements++ = i + row;
 200 *elements++ = i;
 201 *elements++ = i + row + 1;
 202 *elements++ = i;
 203 *elements++ = i + 1;
 204 *elements++ = i + row + 1;
 205
 206
 207 for (y = 0;y < rows - 1;y++)
 208 {
 209         for (x = 0;x < columns - 1;x++)
 210         {
 211                 i = y * rows + x;
 212                 *elements++ = i + columns;
 213                 *elements++ = i;
 214                 *elements++ = i + columns + 1;
 215                 *elements++ = i;
 216                 *elements++ = i + 1;
 217                 *elements++ = i + columns + 1;
 218         }
 219 }
 220
 221 alternative:
 222 0--1--2--3--4
 223 | /| /|\ | /|
 224 |/ |/ | \|/ |
 225 A--B--C--D--E
 226 counterclockwise
 227
 228 for (y = 0;y < rows - 1;y++)
 229 {
 230         for (x = 0;x < columns - 1;x++)
 231         {
 232                 i = y * rows + x;
 233                 *elements++ = i;
 234                 *elements++ = i + columns;
 235                 *elements++ = i + columns + 1;
 236                 *elements++ = i + columns;
 237                 *elements++ = i + columns + 1;
 238                 *elements++ = i + 1;
 239         }
 240 }
 241 */
 242
 243 int polygonelement3i[(POLYGONELEMENTS_MAXPOINTS-2)*3];
 244 unsigned short polygonelement3s[(POLYGONELEMENTS_MAXPOINTS-2)*3];
 245 int quadelement3i[QUADELEMENTS_MAXQUADS*6];
 246 unsigned short quadelement3s[QUADELEMENTS_MAXQUADS*6];
 247
 248 static void GL_VBOStats_f(cmd_state_t *cmd)
 249 {
 250         GL_Mesh_ListVBOs(true);
 251 }
 252
 253 static void GL_Backend_ResetState(void);
 254
 255 static void gl_backend_start(void)
 256 {
 257         memset(&gl_state, 0, sizeof(gl_state));
 258
 259         Mem_ExpandableArray_NewArray(&gl_state.meshbufferarray, r_main_mempool, sizeof(r_meshbuffer_t), 128);
 260
 261         Con_DPrintf("OpenGL backend started.\n");
 262
 263         CHECKGLERROR
 264
 265         switch(vid.renderpath)
 266         {
 267         case RENDERPATH_GL32:
 268                 // GL3.2 Core requires that we have a VAO bound - but using more than one has no performance benefit so this is just placeholder
 269                 qglGenVertexArrays(1, &gl_state.defaultvao);
 270                 qglBindVertexArray(gl_state.defaultvao);
 271                 // fall through
 272         case RENDERPATH_GLES2:
 273                 // fetch current fbo here (default fbo is not 0 on some GLES devices)
 274                 CHECKGLERROR
 275                 qglGetIntegerv(GL_FRAMEBUFFER_BINDING, &gl_state.defaultframebufferobject);CHECKGLERROR
 276                 break;
 277         }
 278
 279         GL_Backend_ResetState();
 280 }
 281
 282 static void gl_backend_shutdown(void)
 283 {
 284         Con_DPrint("OpenGL Backend shutting down\n");
 285
 286         switch(vid.renderpath)
 287         {
 288         case RENDERPATH_GL32:
 289         case RENDERPATH_GLES2:
 290                 break;
 291         }
 292
 293         if (gl_state.preparevertices_tempdata)
 294                 Mem_Free(gl_state.preparevertices_tempdata);
 295
 296         Mem_ExpandableArray_FreeArray(&gl_state.meshbufferarray);
 297
 298         memset(&gl_state, 0, sizeof(gl_state));
 299 }
 300
 301 static void gl_backend_newmap(void)
 302 {
 303 }
 304
 305 static void gl_backend_devicelost(void)
 306 {
 307         int i, endindex;
 308         r_meshbuffer_t *buffer;
 309         switch(vid.renderpath)
 310         {
 311         case RENDERPATH_GL32:
 312         case RENDERPATH_GLES2:
 313                 break;
 314         }
 315         endindex = (int)Mem_ExpandableArray_IndexRange(&gl_state.meshbufferarray);
 316         for (i = 0;i < endindex;i++)
 317         {
 318                 buffer = (r_meshbuffer_t *) Mem_ExpandableArray_RecordAtIndex(&gl_state.meshbufferarray, i);
 319                 if (!buffer || !buffer->isdynamic)
 320                         continue;
 321                 switch(vid.renderpath)
 322                 {
 323                 case RENDERPATH_GL32:
 324                 case RENDERPATH_GLES2:
 325                         break;
 326                 }
 327         }
 328 }
 329
 330 static void gl_backend_devicerestored(void)
 331 {
 332         switch(vid.renderpath)
 333         {
 334         case RENDERPATH_GL32:
 335         case RENDERPATH_GLES2:
 336                 break;
 337         }
 338 }
 339
 340 void gl_backend_init(void)
 341 {
 342         int i;
 343
 344         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 345         {
 346                 polygonelement3s[i * 3 + 0] = 0;
 347                 polygonelement3s[i * 3 + 1] = i + 1;
 348                 polygonelement3s[i * 3 + 2] = i + 2;
 349         }
 350         // elements for rendering a series of quads as triangles
 351         for (i = 0;i < QUADELEMENTS_MAXQUADS;i++)
 352         {
 353                 quadelement3s[i * 6 + 0] = i * 4;
 354                 quadelement3s[i * 6 + 1] = i * 4 + 1;
 355                 quadelement3s[i * 6 + 2] = i * 4 + 2;
 356                 quadelement3s[i * 6 + 3] = i * 4;
 357                 quadelement3s[i * 6 + 4] = i * 4 + 2;
 358                 quadelement3s[i * 6 + 5] = i * 4 + 3;
 359         }
 360
 361         for (i = 0;i < (POLYGONELEMENTS_MAXPOINTS - 2)*3;i++)
 362                 polygonelement3i[i] = polygonelement3s[i];
 363         for (i = 0;i < QUADELEMENTS_MAXQUADS*6;i++)
 364                 quadelement3i[i] = quadelement3s[i];
 365
 366         Cvar_RegisterVariable(&r_render);
 367         Cvar_RegisterVariable(&r_renderview);
 368         Cvar_RegisterVariable(&r_waterwarp);
 369         Cvar_RegisterVariable(&gl_polyblend);
 370         Cvar_RegisterVariable(&v_flipped);
 371         Cvar_RegisterVariable(&gl_debug);
 372         Cvar_RegisterVariable(&gl_paranoid);
 373         Cvar_RegisterVariable(&gl_printcheckerror);
 374
 375         Cmd_AddCommand(&cmd_client, "gl_vbostats", GL_VBOStats_f, "prints a list of all buffer objects (vertex data and triangle elements) and total video memory used by them");
 376
 377         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap, gl_backend_devicelost, gl_backend_devicerestored);
 378 }
 379
 380 void GL_SetMirrorState(qboolean state);
 381
 382 void R_Viewport_TransformToScreen(const r_viewport_t *v, const vec4_t in, vec4_t out)
 383 {
 384         vec4_t temp;
 385         float iw;
 386         Matrix4x4_Transform4 (&v->viewmatrix, in, temp);
 387         Matrix4x4_Transform4 (&v->projectmatrix, temp, out);
 388         iw = 1.0f / out[3];
 389         out[0] = v->x + (out[0] * iw + 1.0f) * v->width * 0.5f;
 390
 391         // for an odd reason, inverting this is wrong for R_Shadow_ScissorForBBox (we then get badly scissored lights)
 392         //out[1] = v->y + v->height - (out[1] * iw + 1.0f) * v->height * 0.5f;
 393         out[1] = v->y + (out[1] * iw + 1.0f) * v->height * 0.5f;
 394
 395         out[2] = v->z + (out[2] * iw + 1.0f) * v->depth * 0.5f;
 396 }
 397
 398 void GL_Finish(void)
 399 {
 400         switch(vid.renderpath)
 401         {
 402         case RENDERPATH_GL32:
 403         case RENDERPATH_GLES2:
 404                 CHECKGLERROR
 405                 qglFinish();CHECKGLERROR
 406                 break;
 407         }
 408 }
 409
 410 static int bboxedges[12][2] =
 411 {
 412         // top
 413         {0, 1}, // +X
 414         {0, 2}, // +Y
 415         {1, 3}, // Y, +X
 416         {2, 3}, // X, +Y
 417         // bottom
 418         {4, 5}, // +X
 419         {4, 6}, // +Y
 420         {5, 7}, // Y, +X
 421         {6, 7}, // X, +Y
 422         // verticals
 423         {0, 4}, // +Z
 424         {1, 5}, // X, +Z
 425         {2, 6}, // Y, +Z
 426         {3, 7}, // XY, +Z
 427 };
 428
 429 qboolean R_ScissorForBBox(const float *mins, const float *maxs, int *scissor)
 430 {
 431         int i, ix1, iy1, ix2, iy2;
 432         float x1, y1, x2, y2;
 433         vec4_t v, v2;
 434         float vertex[20][3];
 435         int j, k;
 436         vec4_t plane4f;
 437         int numvertices;
 438         float corner[8][4];
 439         float dist[8];
 440         int sign[8];
 441         float f;
 442
 443         scissor[0] = r_refdef.view.viewport.x;
 444         scissor[1] = r_refdef.view.viewport.y;
 445         scissor[2] = r_refdef.view.viewport.width;
 446         scissor[3] = r_refdef.view.viewport.height;
 447
 448         // if view is inside the box, just say yes it's visible
 449         if (BoxesOverlap(r_refdef.view.origin, r_refdef.view.origin, mins, maxs))
 450                 return false;
 451
 452         // transform all corners that are infront of the nearclip plane
 453         VectorNegate(r_refdef.view.frustum[4].normal, plane4f);
 454         plane4f[3] = r_refdef.view.frustum[4].dist;
 455         numvertices = 0;
 456         for (i = 0;i < 8;i++)
 457         {
 458                 Vector4Set(corner[i], (i & 1) ? maxs[0] : mins[0], (i & 2) ? maxs[1] : mins[1], (i & 4) ? maxs[2] : mins[2], 1);
 459                 dist[i] = DotProduct4(corner[i], plane4f);
 460                 sign[i] = dist[i] > 0;
 461                 if (!sign[i])
 462                 {
 463                         VectorCopy(corner[i], vertex[numvertices]);
 464                         numvertices++;
 465                 }
 466         }
 467         // if some points are behind the nearclip, add clipped edge points to make
 468         // sure that the scissor boundary is complete
 469         if (numvertices > 0 && numvertices < 8)
 470         {
 471                 // add clipped edge points
 472                 for (i = 0;i < 12;i++)
 473                 {
 474                         j = bboxedges[i][0];
 475                         k = bboxedges[i][1];
 476                         if (sign[j] != sign[k])
 477                         {
 478                                 f = dist[j] / (dist[j] - dist[k]);
 479                                 VectorLerp(corner[j], f, corner[k], vertex[numvertices]);
 480                                 numvertices++;
 481                         }
 482                 }
 483         }
 484
 485         // if we have no points to check, it is behind the view plane
 486         if (!numvertices)
 487                 return true;
 488
 489         // if we have some points to transform, check what screen area is covered
 490         x1 = y1 = x2 = y2 = 0;
 491         v[3] = 1.0f;
 492         //Con_Printf("%i vertices to transform...\n", numvertices);
 493         for (i = 0;i < numvertices;i++)
 494         {
 495                 VectorCopy(vertex[i], v);
 496                 R_Viewport_TransformToScreen(&r_refdef.view.viewport, v, v2);
 497                 //Con_Printf("%.3f %.3f %.3f %.3f transformed to %.3f %.3f %.3f %.3f\n", v[0], v[1], v[2], v[3], v2[0], v2[1], v2[2], v2[3]);
 498                 if (i)
 499                 {
 500                         if (x1 > v2[0]) x1 = v2[0];
 501                         if (x2 < v2[0]) x2 = v2[0];
 502                         if (y1 > v2[1]) y1 = v2[1];
 503                         if (y2 < v2[1]) y2 = v2[1];
 504                 }
 505                 else
 506                 {
 507                         x1 = x2 = v2[0];
 508                         y1 = y2 = v2[1];
 509                 }
 510         }
 511
 512         // now convert the scissor rectangle to integer screen coordinates
 513         ix1 = (int)(x1 - 1.0f);
 514         //iy1 = vid.height - (int)(y2 - 1.0f);
 515         //iy1 = r_refdef.view.viewport.width + 2 * r_refdef.view.viewport.x - (int)(y2 - 1.0f);
 516         iy1 = (int)(y1 - 1.0f);
 517         ix2 = (int)(x2 + 1.0f);
 518         //iy2 = vid.height - (int)(y1 + 1.0f);
 519         //iy2 = r_refdef.view.viewport.height + 2 * r_refdef.view.viewport.y - (int)(y1 + 1.0f);
 520         iy2 = (int)(y2 + 1.0f);
 521         //Con_Printf("%f %f %f %f\n", x1, y1, x2, y2);
 522
 523         // clamp it to the screen
 524         if (ix1 < r_refdef.view.viewport.x) ix1 = r_refdef.view.viewport.x;
 525         if (iy1 < r_refdef.view.viewport.y) iy1 = r_refdef.view.viewport.y;
 526         if (ix2 > r_refdef.view.viewport.x + r_refdef.view.viewport.width) ix2 = r_refdef.view.viewport.x + r_refdef.view.viewport.width;
 527         if (iy2 > r_refdef.view.viewport.y + r_refdef.view.viewport.height) iy2 = r_refdef.view.viewport.y + r_refdef.view.viewport.height;
 528
 529         // if it is inside out, it's not visible
 530         if (ix2 <= ix1 || iy2 <= iy1)
 531                 return true;
 532
 533         // the light area is visible, set up the scissor rectangle
 534         scissor[0] = ix1;
 535         scissor[1] = iy1;
 536         scissor[2] = ix2 - ix1;
 537         scissor[3] = iy2 - iy1;
 538
 539         // D3D Y coordinate is top to bottom, OpenGL is bottom to top, fix the D3D one
 540         switch(vid.renderpath)
 541         {
 542         case RENDERPATH_GL32:
 543         case RENDERPATH_GLES2:
 544                 break;
 545         }
 546
 547         return false;
 548 }
 549
 550
 551 static void R_Viewport_ApplyNearClipPlaneFloatGL(const r_viewport_t *v, float *m, float normalx, float normaly, float normalz, float dist)
 552 {
 553         float q[4];
 554         float d;
 555         float clipPlane[4], v3[3], v4[3];
 556         float normal[3];
 557
 558         // This is inspired by Oblique Depth Projection from http://www.terathon.com/code/oblique.php
 559
 560         VectorSet(normal, normalx, normaly, normalz);
 561         Matrix4x4_Transform3x3(&v->viewmatrix, normal, clipPlane);
 562         VectorScale(normal, -dist, v3);
 563         Matrix4x4_Transform(&v->viewmatrix, v3, v4);
 564         // FIXME: LadyHavoc: I think this can be done more efficiently somehow but I can't remember the technique
 565         clipPlane[3] = -DotProduct(v4, clipPlane);
 566
 567         // Calculate the clip-space corner point opposite the clipping plane
 568         // as (sgn(clipPlane.x), sgn(clipPlane.y), 1, 1) and
 569         // transform it into camera space by multiplying it
 570         // by the inverse of the projection matrix
 571         q[0] = ((clipPlane[0] < 0.0f ? -1.0f : clipPlane[0] > 0.0f ? 1.0f : 0.0f) + m[8]) / m[0];
 572         q[1] = ((clipPlane[1] < 0.0f ? -1.0f : clipPlane[1] > 0.0f ? 1.0f : 0.0f) + m[9]) / m[5];
 573         q[2] = -1.0f;
 574         q[3] = (1.0f + m[10]) / m[14];
 575
 576         // Calculate the scaled plane vector
 577         d = 2.0f / DotProduct4(clipPlane, q);
 578
 579         // Replace the third row of the projection matrix
 580         m[2] = clipPlane[0] * d;
 581         m[6] = clipPlane[1] * d;
 582         m[10] = clipPlane[2] * d + 1.0f;
 583         m[14] = clipPlane[3] * d;
 584 }
 585
 586 void R_Viewport_InitOrtho(r_viewport_t *v, const matrix4x4_t *cameramatrix, int x, int y, int width, int height, float x1, float y1, float x2, float y2, float nearclip, float farclip, const float *nearplane)
 587 {
 588         float left = x1, right = x2, bottom = y2, top = y1, zNear = nearclip, zFar = farclip;
 589         float m[16];
 590         memset(v, 0, sizeof(*v));
 591         v->type = R_VIEWPORTTYPE_ORTHO;
 592         v->cameramatrix = *cameramatrix;
 593         v->x = x;
 594         v->y = y;
 595         v->z = 0;
 596         v->width = width;
 597         v->height = height;
 598         v->depth = 1;
 599         memset(m, 0, sizeof(m));
 600         m[0]  = 2/(right - left);
 601         m[5]  = 2/(top - bottom);
 602         m[10] = -2/(zFar - zNear);
 603         m[12] = - (right + left)/(right - left);
 604         m[13] = - (top + bottom)/(top - bottom);
 605         m[14] = - (zFar + zNear)/(zFar - zNear);
 606         m[15] = 1;
 607         switch(vid.renderpath)
 608         {
 609         case RENDERPATH_GL32:
 610         case RENDERPATH_GLES2:
 611                 break;
 612         }
 613         v->screentodepth[0] = -farclip / (farclip - nearclip);
 614         v->screentodepth[1] = farclip * nearclip / (farclip - nearclip);
 615
 616         Matrix4x4_Invert_Full(&v->viewmatrix, &v->cameramatrix);
 617
 618         if (nearplane)
 619                 R_Viewport_ApplyNearClipPlaneFloatGL(v, m, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 620
 621         Matrix4x4_FromArrayFloatGL(&v->projectmatrix, m);
 622
 623 #if 0
 624         {
 625                 vec4_t test1;
 626                 vec4_t test2;
 627                 Vector4Set(test1, (x1+x2)*0.5f, (y1+y2)*0.5f, 0.0f, 1.0f);
 628                 R_Viewport_TransformToScreen(v, test1, test2);
 629                 Con_Printf("%f %f %f -> %f %f %f\n", test1[0], test1[1], test1[2], test2[0], test2[1], test2[2]);
 630         }
 631 #endif
 632 }
 633
 634 void R_Viewport_InitOrtho3D(r_viewport_t *v, const matrix4x4_t *cameramatrix, int x, int y, int width, int height, float frustumx, float frustumy, float nearclip, float farclip, const float *nearplane)
 635 {
 636         matrix4x4_t tempmatrix, basematrix;
 637         float m[16];
 638         memset(v, 0, sizeof(*v));
 639
 640         v->type = R_VIEWPORTTYPE_PERSPECTIVE;
 641         v->cameramatrix = *cameramatrix;
 642         v->x = x;
 643         v->y = y;
 644         v->z = 0;
 645         v->width = width;
 646         v->height = height;
 647         v->depth = 1;
 648         memset(m, 0, sizeof(m));
 649         m[0]  = 1.0 / frustumx;
 650         m[5]  = 1.0 / frustumy;
 651         m[10] = -2 / (farclip - nearclip);
 652         m[14] = -(farclip + nearclip) / (farclip - nearclip);
 653         m[15] = 1;
 654         v->screentodepth[0] = -farclip / (farclip - nearclip);
 655         v->screentodepth[1] = farclip * nearclip / (farclip - nearclip);
 656
 657         Matrix4x4_Invert_Full(&tempmatrix, &v->cameramatrix);
 658         Matrix4x4_CreateRotate(&basematrix, -90, 1, 0, 0);
 659         Matrix4x4_ConcatRotate(&basematrix, 90, 0, 0, 1);
 660         Matrix4x4_Concat(&v->viewmatrix, &basematrix, &tempmatrix);
 661
 662         if (nearplane)
 663                 R_Viewport_ApplyNearClipPlaneFloatGL(v, m, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 664
 665         if(v_flipped.integer)
 666         {
 667                 m[0] = -m[0];
 668                 m[4] = -m[4];
 669                 m[8] = -m[8];
 670                 m[12] = -m[12];
 671         }
 672
 673         Matrix4x4_FromArrayFloatGL(&v->projectmatrix, m);
 674 }
 675
 676 void R_Viewport_InitPerspective(r_viewport_t *v, const matrix4x4_t *cameramatrix, int x, int y, int width, int height, float frustumx, float frustumy, float nearclip, float farclip, const float *nearplane)
 677 {
 678         matrix4x4_t tempmatrix, basematrix;
 679         float m[16];
 680         memset(v, 0, sizeof(*v));
 681
 682         v->type = R_VIEWPORTTYPE_PERSPECTIVE;
 683         v->cameramatrix = *cameramatrix;
 684         v->x = x;
 685         v->y = y;
 686         v->z = 0;
 687         v->width = width;
 688         v->height = height;
 689         v->depth = 1;
 690         memset(m, 0, sizeof(m));
 691         m[0]  = 1.0 / frustumx;
 692         m[5]  = 1.0 / frustumy;
 693         m[10] = -(farclip + nearclip) / (farclip - nearclip);
 694         m[11] = -1;
 695         m[14] = -2 * nearclip * farclip / (farclip - nearclip);
 696         v->screentodepth[0] = -farclip / (farclip - nearclip);
 697         v->screentodepth[1] = farclip * nearclip / (farclip - nearclip);
 698
 699         Matrix4x4_Invert_Full(&tempmatrix, &v->cameramatrix);
 700         Matrix4x4_CreateRotate(&basematrix, -90, 1, 0, 0);
 701         Matrix4x4_ConcatRotate(&basematrix, 90, 0, 0, 1);
 702         Matrix4x4_Concat(&v->viewmatrix, &basematrix, &tempmatrix);
 703
 704         if (nearplane)
 705                 R_Viewport_ApplyNearClipPlaneFloatGL(v, m, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 706
 707         if(v_flipped.integer)
 708         {
 709                 m[0] = -m[0];
 710                 m[4] = -m[4];
 711                 m[8] = -m[8];
 712                 m[12] = -m[12];
 713         }
 714
 715         Matrix4x4_FromArrayFloatGL(&v->projectmatrix, m);
 716 }
 717
 718 void R_Viewport_InitPerspectiveInfinite(r_viewport_t *v, const matrix4x4_t *cameramatrix, int x, int y, int width, int height, float frustumx, float frustumy, float nearclip, const float *nearplane)
 719 {
 720         matrix4x4_t tempmatrix, basematrix;
 721         const float nudge = 1.0 - 1.0 / (1<<23);
 722         float m[16];
 723         memset(v, 0, sizeof(*v));
 724
 725         v->type = R_VIEWPORTTYPE_PERSPECTIVE_INFINITEFARCLIP;
 726         v->cameramatrix = *cameramatrix;
 727         v->x = x;
 728         v->y = y;
 729         v->z = 0;
 730         v->width = width;
 731         v->height = height;
 732         v->depth = 1;
 733         memset(m, 0, sizeof(m));
 734         m[ 0] = 1.0 / frustumx;
 735         m[ 5] = 1.0 / frustumy;
 736         m[10] = -nudge;
 737         m[11] = -1;
 738         m[14] = -2 * nearclip * nudge;
 739         v->screentodepth[0] = (m[10] + 1) * 0.5 - 1;
 740         v->screentodepth[1] = m[14] * -0.5;
 741
 742         Matrix4x4_Invert_Full(&tempmatrix, &v->cameramatrix);
 743         Matrix4x4_CreateRotate(&basematrix, -90, 1, 0, 0);
 744         Matrix4x4_ConcatRotate(&basematrix, 90, 0, 0, 1);
 745         Matrix4x4_Concat(&v->viewmatrix, &basematrix, &tempmatrix);
 746
 747         if (nearplane)
 748                 R_Viewport_ApplyNearClipPlaneFloatGL(v, m, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 749
 750         if(v_flipped.integer)
 751         {
 752                 m[0] = -m[0];
 753                 m[4] = -m[4];
 754                 m[8] = -m[8];
 755                 m[12] = -m[12];
 756         }
 757
 758         Matrix4x4_FromArrayFloatGL(&v->projectmatrix, m);
 759 }
 760
 761 float cubeviewmatrix[6][16] =
 762 {
 763     // standard cubemap projections
 764     { // +X
 765          0, 0,-1, 0,
 766          0,-1, 0, 0,
 767         -1, 0, 0, 0,
 768          0, 0, 0, 1,
 769     },
 770     { // -X
 771          0, 0, 1, 0,
 772          0,-1, 0, 0,
 773          1, 0, 0, 0,
 774          0, 0, 0, 1,
 775     },
 776     { // +Y
 777          1, 0, 0, 0,
 778          0, 0,-1, 0,
 779          0, 1, 0, 0,
 780          0, 0, 0, 1,
 781     },
 782     { // -Y
 783          1, 0, 0, 0,
 784          0, 0, 1, 0,
 785          0,-1, 0, 0,
 786          0, 0, 0, 1,
 787     },
 788     { // +Z
 789          1, 0, 0, 0,
 790          0,-1, 0, 0,
 791          0, 0,-1, 0,
 792          0, 0, 0, 1,
 793     },
 794     { // -Z
 795         -1, 0, 0, 0,
 796          0,-1, 0, 0,
 797          0, 0, 1, 0,
 798          0, 0, 0, 1,
 799     },
 800 };
 801 float rectviewmatrix[6][16] =
 802 {
 803     // sign-preserving cubemap projections
 804     { // +X
 805          0, 0,-1, 0,
 806          0, 1, 0, 0,
 807          1, 0, 0, 0,
 808          0, 0, 0, 1,
 809     },
 810     { // -X
 811          0, 0, 1, 0,
 812          0, 1, 0, 0,
 813          1, 0, 0, 0,
 814          0, 0, 0, 1,
 815     },
 816     { // +Y
 817          1, 0, 0, 0,
 818          0, 0,-1, 0,
 819          0, 1, 0, 0,
 820          0, 0, 0, 1,
 821     },
 822     { // -Y
 823          1, 0, 0, 0,
 824          0, 0, 1, 0,
 825          0, 1, 0, 0,
 826          0, 0, 0, 1,
 827     },
 828     { // +Z
 829          1, 0, 0, 0,
 830          0, 1, 0, 0,
 831          0, 0,-1, 0,
 832          0, 0, 0, 1,
 833     },
 834     { // -Z
 835          1, 0, 0, 0,
 836          0, 1, 0, 0,
 837          0, 0, 1, 0,
 838          0, 0, 0, 1,
 839     },
 840 };
 841
 842 void R_Viewport_InitCubeSideView(r_viewport_t *v, const matrix4x4_t *cameramatrix, int side, int size, float nearclip, float farclip, const float *nearplane)
 843 {
 844         matrix4x4_t tempmatrix, basematrix;
 845         float m[16];
 846         memset(v, 0, sizeof(*v));
 847         v->type = R_VIEWPORTTYPE_PERSPECTIVECUBESIDE;
 848         v->cameramatrix = *cameramatrix;
 849         v->width = size;
 850         v->height = size;
 851         v->depth = 1;
 852         memset(m, 0, sizeof(m));
 853         m[0] = m[5] = 1.0f;
 854         m[10] = -(farclip + nearclip) / (farclip - nearclip);
 855         m[11] = -1;
 856         m[14] = -2 * nearclip * farclip / (farclip - nearclip);
 857
 858         Matrix4x4_FromArrayFloatGL(&basematrix, cubeviewmatrix[side]);
 859         Matrix4x4_Invert_Full(&tempmatrix, &v->cameramatrix);
 860         Matrix4x4_Concat(&v->viewmatrix, &basematrix, &tempmatrix);
 861
 862         if (nearplane)
 863                 R_Viewport_ApplyNearClipPlaneFloatGL(v, m, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 864
 865         Matrix4x4_FromArrayFloatGL(&v->projectmatrix, m);
 866 }
 867
 868 void R_Viewport_InitRectSideView(r_viewport_t *v, const matrix4x4_t *cameramatrix, int side, int size, int border, float nearclip, float farclip, const float *nearplane, int offsetx, int offsety)
 869 {
 870         matrix4x4_t tempmatrix, basematrix;
 871         float m[16];
 872         memset(v, 0, sizeof(*v));
 873         v->type = R_VIEWPORTTYPE_PERSPECTIVECUBESIDE;
 874         v->cameramatrix = *cameramatrix;
 875         v->x = offsetx + (side & 1) * size;
 876         v->y = offsety + (side >> 1) * size;
 877         v->width = size;
 878         v->height = size;
 879         v->depth = 1;
 880         memset(m, 0, sizeof(m));
 881         m[0] = m[5] = 1.0f * ((float)size - border) / size;
 882         m[10] = -(farclip + nearclip) / (farclip - nearclip);
 883         m[11] = -1;
 884         m[14] = -2 * nearclip * farclip / (farclip - nearclip);
 885
 886         Matrix4x4_FromArrayFloatGL(&basematrix, rectviewmatrix[side]);
 887         Matrix4x4_Invert_Full(&tempmatrix, &v->cameramatrix);
 888         Matrix4x4_Concat(&v->viewmatrix, &basematrix, &tempmatrix);
 889
 890         if (nearplane)
 891                 R_Viewport_ApplyNearClipPlaneFloatGL(v, m, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 892
 893         Matrix4x4_FromArrayFloatGL(&v->projectmatrix, m);
 894 }
 895
 896 void R_SetViewport(const r_viewport_t *v)
 897 {
 898         gl_viewport = *v;
 899
 900         // FIXME: v_flipped_state is evil, this probably breaks somewhere
 901         GL_SetMirrorState(v_flipped.integer && (v->type == R_VIEWPORTTYPE_PERSPECTIVE || v->type == R_VIEWPORTTYPE_PERSPECTIVE_INFINITEFARCLIP));
 902
 903         // copy over the matrices to our state
 904         gl_viewmatrix = v->viewmatrix;
 905         gl_projectionmatrix = v->projectmatrix;
 906
 907         switch(vid.renderpath)
 908         {
 909         case RENDERPATH_GL32:
 910         case RENDERPATH_GLES2:
 911                 CHECKGLERROR
 912                 qglViewport(v->x, v->y, v->width, v->height);CHECKGLERROR
 913                 break;
 914         }
 915
 916         // force an update of the derived matrices
 917         gl_modelmatrixchanged = true;
 918         R_EntityMatrix(&gl_modelmatrix);
 919 }
 920
 921 void R_GetViewport(r_viewport_t *v)
 922 {
 923         *v = gl_viewport;
 924 }
 925
 926 static void GL_BindVBO(int bufferobject)
 927 {
 928         if (gl_state.vertexbufferobject != bufferobject)
 929         {
 930                 gl_state.vertexbufferobject = bufferobject;
 931                 CHECKGLERROR
 932                 qglBindBuffer(GL_ARRAY_BUFFER, bufferobject);CHECKGLERROR
 933         }
 934 }
 935
 936 static void GL_BindEBO(int bufferobject)
 937 {
 938         if (gl_state.elementbufferobject != bufferobject)
 939         {
 940                 gl_state.elementbufferobject = bufferobject;
 941                 CHECKGLERROR
 942                 qglBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferobject);CHECKGLERROR
 943         }
 944 }
 945
 946 static void GL_BindUBO(int bufferobject)
 947 {
 948         if (gl_state.uniformbufferobject != bufferobject)
 949         {
 950                 gl_state.uniformbufferobject = bufferobject;
 951 #ifdef GL_UNIFORM_BUFFER
 952                 CHECKGLERROR
 953                 qglBindBuffer(GL_UNIFORM_BUFFER, bufferobject);CHECKGLERROR
 954 #endif
 955         }
 956 }
 957
 958 static const GLuint drawbuffers[4] = {GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2, GL_COLOR_ATTACHMENT3};
 959 int R_Mesh_CreateFramebufferObject(rtexture_t *depthtexture, rtexture_t *colortexture, rtexture_t *colortexture2, rtexture_t *colortexture3, rtexture_t *colortexture4)
 960 {
 961         int temp;
 962         GLuint status;
 963         switch(vid.renderpath)
 964         {
 965         case RENDERPATH_GL32:
 966         case RENDERPATH_GLES2:
 967                 CHECKGLERROR
 968                 qglGenFramebuffers(1, (GLuint*)&temp);CHECKGLERROR
 969                 R_Mesh_SetRenderTargets(temp, NULL, NULL, NULL, NULL, NULL);
 970                 // GL_ARB_framebuffer_object (GL3-class hardware) - depth stencil attachment
 971 #ifdef USE_GLES2
 972                 // FIXME: separate stencil attachment on GLES
 973                 if (depthtexture  && depthtexture->texnum ) qglFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT  , depthtexture->gltexturetypeenum , depthtexture->texnum , 0);CHECKGLERROR
 974                 if (depthtexture  && depthtexture->renderbuffernum ) qglFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT  , GL_RENDERBUFFER, depthtexture->renderbuffernum );CHECKGLERROR
 975 #else
 976                 if (depthtexture  && depthtexture->texnum )
 977                 {
 978                         qglFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT  , depthtexture->gltexturetypeenum , depthtexture->texnum , 0);CHECKGLERROR
 979                         if (depthtexture->glisdepthstencil) qglFramebufferTexture2D(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT  , depthtexture->gltexturetypeenum , depthtexture->texnum , 0);CHECKGLERROR
 980                 }
 981                 if (depthtexture  && depthtexture->renderbuffernum )
 982                 {
 983                         qglFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT  , GL_RENDERBUFFER, depthtexture->renderbuffernum );CHECKGLERROR
 984                         if (depthtexture->glisdepthstencil) qglFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT  , GL_RENDERBUFFER, depthtexture->renderbuffernum );CHECKGLERROR
 985                 }
 986 #endif
 987                 if (colortexture  && colortexture->texnum ) qglFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 , colortexture->gltexturetypeenum , colortexture->texnum , 0);CHECKGLERROR
 988                 if (colortexture2 && colortexture2->texnum) qglFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1 , colortexture2->gltexturetypeenum, colortexture2->texnum, 0);CHECKGLERROR
 989                 if (colortexture3 && colortexture3->texnum) qglFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT2 , colortexture3->gltexturetypeenum, colortexture3->texnum, 0);CHECKGLERROR
 990                 if (colortexture4 && colortexture4->texnum) qglFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT3 , colortexture4->gltexturetypeenum, colortexture4->texnum, 0);CHECKGLERROR
 991                 if (colortexture  && colortexture->renderbuffernum ) qglFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 , GL_RENDERBUFFER, colortexture->renderbuffernum );CHECKGLERROR
 992                 if (colortexture2 && colortexture2->renderbuffernum) qglFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1 , GL_RENDERBUFFER, colortexture2->renderbuffernum);CHECKGLERROR
 993                 if (colortexture3 && colortexture3->renderbuffernum) qglFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT2 , GL_RENDERBUFFER, colortexture3->renderbuffernum);CHECKGLERROR
 994                 if (colortexture4 && colortexture4->renderbuffernum) qglFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT3 , GL_RENDERBUFFER, colortexture4->renderbuffernum);CHECKGLERROR
 995
 996 #ifndef USE_GLES2
 997                 if (colortexture4)
 998                 {
 999                         qglDrawBuffers(4, drawbuffers);CHECKGLERROR
1000                         qglReadBuffer(GL_NONE);CHECKGLERROR
1001                 }
1002                 else if (colortexture3)
1003                 {
1004                         qglDrawBuffers(3, drawbuffers);CHECKGLERROR
1005                         qglReadBuffer(GL_NONE);CHECKGLERROR
1006                 }
1007                 else if (colortexture2)
1008                 {
1009                         qglDrawBuffers(2, drawbuffers);CHECKGLERROR
1010                         qglReadBuffer(GL_NONE);CHECKGLERROR
1011                 }
1012                 else if (colortexture)
1013                 {
1014                         qglDrawBuffer(GL_COLOR_ATTACHMENT0);CHECKGLERROR
1015                         qglReadBuffer(GL_COLOR_ATTACHMENT0);CHECKGLERROR
1016                 }
1017                 else
1018                 {
1019                         qglDrawBuffer(GL_NONE);CHECKGLERROR
1020                         qglReadBuffer(GL_NONE);CHECKGLERROR
1021                 }
1022 #endif
1023                 status = qglCheckFramebufferStatus(GL_FRAMEBUFFER);CHECKGLERROR
1024                 if (status != GL_FRAMEBUFFER_COMPLETE)
1025                 {
1026                         Con_Printf("R_Mesh_CreateFramebufferObject: glCheckFramebufferStatus returned %i\n", status);
1027                         gl_state.framebufferobject = 0; // GL unbinds it for us
1028                         qglDeleteFramebuffers(1, (GLuint*)&temp);CHECKGLERROR
1029                         temp = 0;
1030                 }
1031                 return temp;
1032         }
1033         return 0;
1034 }
1035
1036 void R_Mesh_DestroyFramebufferObject(int fbo)
1037 {
1038         switch(vid.renderpath)
1039         {
1040         case RENDERPATH_GL32:
1041         case RENDERPATH_GLES2:
1042                 if (fbo)
1043                 {
1044                         // GL clears the binding if we delete something bound
1045                         if (gl_state.framebufferobject == fbo)
1046                                 gl_state.framebufferobject = 0;
1047                         qglDeleteFramebuffers(1, (GLuint*)&fbo);CHECKGLERROR
1048                 }
1049                 break;
1050         }
1051 }
1052
1053 void R_Mesh_SetRenderTargets(int fbo, rtexture_t *depthtexture, rtexture_t *colortexture, rtexture_t *colortexture2, rtexture_t *colortexture3, rtexture_t *colortexture4)
1054 {
1055         unsigned int i;
1056         unsigned int j;
1057         rtexture_t *textures[5];
1058         Vector4Set(textures, colortexture, colortexture2, colortexture3, colortexture4);
1059         textures[4] = depthtexture;
1060         // unbind any matching textures immediately, otherwise D3D will complain about a bound texture being used as a render target
1061         for (j = 0;j < 5;j++)
1062                 if (textures[j])
1063                         for (i = 0;i < MAX_TEXTUREUNITS;i++)
1064                                 if (gl_state.units[i].texture == textures[j])
1065                                         R_Mesh_TexBind(i, NULL);
1066         // set up framebuffer object or render targets for the active rendering API
1067         switch (vid.renderpath)
1068         {
1069         case RENDERPATH_GL32:
1070         case RENDERPATH_GLES2:
1071                 if (gl_state.framebufferobject != fbo)
1072                 {
1073                         gl_state.framebufferobject = fbo;
1074                         qglBindFramebuffer(GL_FRAMEBUFFER, gl_state.framebufferobject ? gl_state.framebufferobject : gl_state.defaultframebufferobject);CHECKGLERROR
1075                 }
1076                 break;
1077         }
1078 }
1079
1080 static void GL_Backend_ResetState(void)
1081 {
1082         gl_state.active = true;
1083         gl_state.depthtest = true;
1084         gl_state.alphatocoverage = false;
1085         gl_state.blendfunc1 = GL_ONE;
1086         gl_state.blendfunc2 = GL_ZERO;
1087         gl_state.blend = false;
1088         gl_state.depthmask = GL_TRUE;
1089         gl_state.colormask = 15;
1090         gl_state.color4f[0] = gl_state.color4f[1] = gl_state.color4f[2] = gl_state.color4f[3] = 1;
1091         gl_state.lockrange_first = 0;
1092         gl_state.lockrange_count = 0;
1093         gl_state.cullface = GL_FRONT;
1094         gl_state.cullfaceenable = false;
1095         gl_state.polygonoffset[0] = 0;
1096         gl_state.polygonoffset[1] = 0;
1097         gl_state.framebufferobject = 0;
1098         gl_state.depthfunc = GL_LEQUAL;
1099
1100         switch(vid.renderpath)
1101         {
1102         case RENDERPATH_GL32:
1103         case RENDERPATH_GLES2:
1104                 // set up debug output early
1105                 if (vid.support.arb_debug_output)
1106                 {
1107                         GLuint unused = 0;
1108                         CHECKGLERROR
1109                         if (gl_debug.integer >= 1)
1110                                 qglEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB);
1111                         if (gl_debug.integer >= 3)
1112                                 qglDebugMessageControlARB(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, &unused, gl_debug.integer >= 3 ? GL_TRUE : GL_FALSE);
1113                         else if (gl_debug.integer >= 1)
1114                         {
1115                                 qglDebugMessageControlARB(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_LOW_ARB, 0, &unused, gl_debug.integer >= 3 ? GL_TRUE : GL_FALSE);
1116                                 qglDebugMessageControlARB(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_MEDIUM_ARB, 0, &unused, gl_debug.integer >= 2 ? GL_TRUE : GL_FALSE);
1117                                 qglDebugMessageControlARB(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_HIGH_ARB, 0, &unused, gl_debug.integer >= 1 ? GL_TRUE : GL_FALSE);
1118                         }
1119                         else
1120                                 qglDebugMessageControlARB(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, &unused, GL_FALSE);
1121                         qglDebugMessageCallbackARB(GL_DebugOutputCallback, NULL);
1122                 }
1123                 CHECKGLERROR
1124                 qglColorMask(1, 1, 1, 1);CHECKGLERROR
1125                 qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
1126                 qglDisable(GL_BLEND);CHECKGLERROR
1127                 qglCullFace(gl_state.cullface);CHECKGLERROR
1128                 qglDisable(GL_CULL_FACE);CHECKGLERROR
1129                 qglDepthFunc(GL_LEQUAL);CHECKGLERROR
1130                 qglEnable(GL_DEPTH_TEST);CHECKGLERROR
1131                 qglDepthMask(gl_state.depthmask);CHECKGLERROR
1132                 qglPolygonOffset(gl_state.polygonoffset[0], gl_state.polygonoffset[1]);
1133                 qglBindBuffer(GL_ARRAY_BUFFER, 0);
1134                 qglBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
1135                 qglBindFramebuffer(GL_FRAMEBUFFER, gl_state.defaultframebufferobject);
1136                 qglEnableVertexAttribArray(GLSLATTRIB_POSITION);
1137                 qglDisableVertexAttribArray(GLSLATTRIB_COLOR);
1138                 qglVertexAttrib4f(GLSLATTRIB_COLOR, 1, 1, 1, 1);
1139                 gl_state.unit = MAX_TEXTUREUNITS;
1140                 CHECKGLERROR
1141                 break;
1142         }
1143 }
1144
1145 void GL_ActiveTexture(unsigned int num)
1146 {
1147         if (gl_state.unit != num)
1148         {
1149                 gl_state.unit = num;
1150                 switch(vid.renderpath)
1151                 {
1152                 case RENDERPATH_GL32:
1153                 case RENDERPATH_GLES2:
1154                         CHECKGLERROR
1155                         qglActiveTexture(GL_TEXTURE0 + gl_state.unit);CHECKGLERROR
1156                         break;
1157                 }
1158         }
1159 }
1160
1161 void GL_BlendFunc(int blendfunc1, int blendfunc2)
1162 {
1163         if (gl_state.blendfunc1 != blendfunc1 || gl_state.blendfunc2 != blendfunc2)
1164         {
1165                 qboolean blendenable;
1166                 gl_state.blendfunc1 = blendfunc1;
1167                 gl_state.blendfunc2 = blendfunc2;
1168                 blendenable = (gl_state.blendfunc1 != GL_ONE || gl_state.blendfunc2 != GL_ZERO);
1169                 switch(vid.renderpath)
1170                 {
1171                 case RENDERPATH_GL32:
1172                 case RENDERPATH_GLES2:
1173                         CHECKGLERROR
1174                         if (qglBlendFuncSeparate)
1175                         {
1176                                 qglBlendFuncSeparate(gl_state.blendfunc1, gl_state.blendfunc2, GL_ZERO, GL_ONE);CHECKGLERROR // ELUAN: Adreno 225 (and others) compositing workaround
1177                         }
1178                         else
1179                         {
1180                                 qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
1181                         }
1182                         if (gl_state.blend != blendenable)
1183                         {
1184                                 gl_state.blend = blendenable;
1185                                 if (!gl_state.blend)
1186                                 {
1187                                         qglDisable(GL_BLEND);CHECKGLERROR
1188                                 }
1189                                 else
1190                                 {
1191                                         qglEnable(GL_BLEND);CHECKGLERROR
1192                                 }
1193                         }
1194                         break;
1195                 }
1196         }
1197 }
1198
1199 void GL_DepthMask(int state)
1200 {
1201         if (gl_state.depthmask != state)
1202         {
1203                 gl_state.depthmask = state;
1204                 switch(vid.renderpath)
1205                 {
1206                 case RENDERPATH_GL32:
1207                 case RENDERPATH_GLES2:
1208                         CHECKGLERROR
1209                         qglDepthMask(gl_state.depthmask);CHECKGLERROR
1210                         break;
1211                 }
1212         }
1213 }
1214
1215 void GL_DepthTest(int state)
1216 {
1217         if (gl_state.depthtest != state)
1218         {
1219                 gl_state.depthtest = state;
1220                 switch(vid.renderpath)
1221                 {
1222                 case RENDERPATH_GL32:
1223                 case RENDERPATH_GLES2:
1224                         CHECKGLERROR
1225                         if (gl_state.depthtest)
1226                         {
1227                                 qglEnable(GL_DEPTH_TEST);CHECKGLERROR
1228                         }
1229                         else
1230                         {
1231                                 qglDisable(GL_DEPTH_TEST);CHECKGLERROR
1232                         }
1233                         break;
1234                 }
1235         }
1236 }
1237
1238 void GL_DepthFunc(int state)
1239 {
1240         if (gl_state.depthfunc != state)
1241         {
1242                 gl_state.depthfunc = state;
1243                 switch(vid.renderpath)
1244                 {
1245                 case RENDERPATH_GL32:
1246                 case RENDERPATH_GLES2:
1247                         CHECKGLERROR
1248                         qglDepthFunc(gl_state.depthfunc);CHECKGLERROR
1249                         break;
1250                 }
1251         }
1252 }
1253
1254 void GL_DepthRange(float nearfrac, float farfrac)
1255 {
1256         if (gl_state.depthrange[0] != nearfrac || gl_state.depthrange[1] != farfrac)
1257         {
1258                 gl_state.depthrange[0] = nearfrac;
1259                 gl_state.depthrange[1] = farfrac;
1260                 switch(vid.renderpath)
1261                 {
1262                 case RENDERPATH_GL32:
1263                 case RENDERPATH_GLES2:
1264                         CHECKGLERROR
1265 #ifdef USE_GLES2
1266                         qglDepthRangef(gl_state.depthrange[0], gl_state.depthrange[1]);CHECKGLERROR
1267 #else
1268                         qglDepthRange(gl_state.depthrange[0], gl_state.depthrange[1]);CHECKGLERROR
1269 #endif
1270                         break;
1271                 }
1272         }
1273 }
1274
1275 void R_SetStencil(qboolean enable, int writemask, int fail, int zfail, int zpass, int compare, int comparereference, int comparemask)
1276 {
1277         switch (vid.renderpath)
1278         {
1279         case RENDERPATH_GL32:
1280         case RENDERPATH_GLES2:
1281                 CHECKGLERROR
1282                 if (enable)
1283                 {
1284                         qglEnable(GL_STENCIL_TEST);CHECKGLERROR
1285                 }
1286                 else
1287                 {
1288                         qglDisable(GL_STENCIL_TEST);CHECKGLERROR
1289                 }
1290                 qglStencilMask(writemask);CHECKGLERROR
1291                 qglStencilOp(fail, zfail, zpass);CHECKGLERROR
1292                 qglStencilFunc(compare, comparereference, comparemask);CHECKGLERROR
1293                 CHECKGLERROR
1294                 break;
1295         }
1296 }
1297
1298 void GL_PolygonOffset(float planeoffset, float depthoffset)
1299 {
1300         if (gl_state.polygonoffset[0] != planeoffset || gl_state.polygonoffset[1] != depthoffset)
1301         {
1302                 gl_state.polygonoffset[0] = planeoffset;
1303                 gl_state.polygonoffset[1] = depthoffset;
1304                 switch(vid.renderpath)
1305                 {
1306                 case RENDERPATH_GL32:
1307                 case RENDERPATH_GLES2:
1308                         CHECKGLERROR
1309                         qglPolygonOffset(gl_state.polygonoffset[0], gl_state.polygonoffset[1]);CHECKGLERROR
1310                         break;
1311                 }
1312         }
1313 }
1314
1315 void GL_SetMirrorState(qboolean state)
1316 {
1317         if (v_flipped_state != state)
1318         {
1319                 v_flipped_state = state;
1320                 if (gl_state.cullface == GL_BACK)
1321                         gl_state.cullface = GL_FRONT;
1322                 else if (gl_state.cullface == GL_FRONT)
1323                         gl_state.cullface = GL_BACK;
1324                 else
1325                         return;
1326                 switch(vid.renderpath)
1327                 {
1328                 case RENDERPATH_GL32:
1329                 case RENDERPATH_GLES2:
1330                         CHECKGLERROR
1331                         qglCullFace(gl_state.cullface);CHECKGLERROR
1332                         break;
1333                 }
1334         }
1335 }
1336
1337 void GL_CullFace(int state)
1338 {
1339         if(v_flipped_state)
1340         {
1341                 if(state == GL_FRONT)
1342                         state = GL_BACK;
1343                 else if(state == GL_BACK)
1344                         state = GL_FRONT;
1345         }
1346
1347         switch(vid.renderpath)
1348         {
1349         case RENDERPATH_GL32:
1350         case RENDERPATH_GLES2:
1351                 CHECKGLERROR
1352
1353                 if (state != GL_NONE)
1354                 {
1355                         if (!gl_state.cullfaceenable)
1356                         {
1357                                 gl_state.cullfaceenable = true;
1358                                 qglEnable(GL_CULL_FACE);CHECKGLERROR
1359                         }
1360                         if (gl_state.cullface != state)
1361                         {
1362                                 gl_state.cullface = state;
1363                                 qglCullFace(gl_state.cullface);CHECKGLERROR
1364                         }
1365                 }
1366                 else
1367                 {
1368                         if (gl_state.cullfaceenable)
1369                         {
1370                                 gl_state.cullfaceenable = false;
1371                                 qglDisable(GL_CULL_FACE);CHECKGLERROR
1372                         }
1373                 }
1374                 break;
1375         }
1376 }
1377
1378 void GL_AlphaToCoverage(qboolean state)
1379 {
1380         if (gl_state.alphatocoverage != state)
1381         {
1382                 gl_state.alphatocoverage = state;
1383                 switch(vid.renderpath)
1384                 {
1385                 case RENDERPATH_GLES2:
1386                         break;
1387                 case RENDERPATH_GL32:
1388 #ifndef USE_GLES2
1389                         // alpha to coverage turns the alpha value of the pixel into 0%, 25%, 50%, 75% or 100% by masking the multisample fragments accordingly
1390                         CHECKGLERROR
1391                         if (gl_state.alphatocoverage)
1392                         {
1393                                 qglEnable(GL_SAMPLE_ALPHA_TO_COVERAGE);CHECKGLERROR
1394 //                              qglEnable(GL_MULTISAMPLE);CHECKGLERROR
1395                         }
1396                         else
1397                         {
1398                                 qglDisable(GL_SAMPLE_ALPHA_TO_COVERAGE);CHECKGLERROR
1399 //                              qglDisable(GL_MULTISAMPLE);CHECKGLERROR
1400                         }
1401 #endif
1402                         break;
1403                 }
1404         }
1405 }
1406
1407 void GL_ColorMask(int r, int g, int b, int a)
1408 {
1409         // NOTE: this matches D3DCOLORWRITEENABLE_RED, GREEN, BLUE, ALPHA
1410         int state = (r ? 1 : 0) | (g ? 2 : 0) | (b ? 4 : 0) | (a ? 8 : 0);
1411         if (gl_state.colormask != state)
1412         {
1413                 gl_state.colormask = state;
1414                 switch(vid.renderpath)
1415                 {
1416                 case RENDERPATH_GL32:
1417                 case RENDERPATH_GLES2:
1418                         CHECKGLERROR
1419                         qglColorMask((GLboolean)r, (GLboolean)g, (GLboolean)b, (GLboolean)a);CHECKGLERROR
1420                         break;
1421                 }
1422         }
1423 }
1424
1425 void GL_Color(float cr, float cg, float cb, float ca)
1426 {
1427         if (gl_state.pointer_color_enabled || gl_state.color4f[0] != cr || gl_state.color4f[1] != cg || gl_state.color4f[2] != cb || gl_state.color4f[3] != ca)
1428         {
1429                 gl_state.color4f[0] = cr;
1430                 gl_state.color4f[1] = cg;
1431                 gl_state.color4f[2] = cb;
1432                 gl_state.color4f[3] = ca;
1433                 switch(vid.renderpath)
1434                 {
1435                 case RENDERPATH_GL32:
1436                 case RENDERPATH_GLES2:
1437                         qglVertexAttrib4f(GLSLATTRIB_COLOR, cr, cg, cb, ca);CHECKGLERROR
1438                         break;
1439                 }
1440         }
1441 }
1442
1443 void GL_Scissor (int x, int y, int width, int height)
1444 {
1445         switch(vid.renderpath)
1446         {
1447         case RENDERPATH_GL32:
1448         case RENDERPATH_GLES2:
1449                 CHECKGLERROR
1450                 qglScissor(x, y,width,height);CHECKGLERROR
1451                 break;
1452         }
1453 }
1454
1455 void GL_ScissorTest(int state)
1456 {
1457         if (gl_state.scissortest != state)
1458         {
1459                 gl_state.scissortest = state;
1460                 switch(vid.renderpath)
1461                 {
1462                 case RENDERPATH_GL32:
1463                 case RENDERPATH_GLES2:
1464                         CHECKGLERROR
1465                         if(gl_state.scissortest)
1466                                 qglEnable(GL_SCISSOR_TEST);
1467                         else
1468                                 qglDisable(GL_SCISSOR_TEST);
1469                         CHECKGLERROR
1470                         break;
1471                 }
1472         }
1473 }
1474
1475 void GL_Clear(int mask, const float *colorvalue, float depthvalue, int stencilvalue)
1476 {
1477         // opaque black - if you want transparent black, you'll need to pass in a colorvalue
1478         static const float blackcolor[4] = {0.0f, 0.0f, 0.0f, 1.0f};
1479         // prevent warnings when trying to clear a buffer that does not exist
1480         if (!colorvalue)
1481                 colorvalue = blackcolor;
1482         if (!vid.stencil)
1483         {
1484                 mask &= ~GL_STENCIL_BUFFER_BIT;
1485                 stencilvalue = 0;
1486         }
1487         switch(vid.renderpath)
1488         {
1489         case RENDERPATH_GL32:
1490         case RENDERPATH_GLES2:
1491                 CHECKGLERROR
1492                 if (mask & GL_COLOR_BUFFER_BIT)
1493                 {
1494                         qglClearColor(colorvalue[0], colorvalue[1], colorvalue[2], colorvalue[3]);CHECKGLERROR
1495                 }
1496                 if (mask & GL_DEPTH_BUFFER_BIT)
1497                 {
1498 #ifdef USE_GLES2
1499                         qglClearDepthf(depthvalue);CHECKGLERROR
1500 #else
1501                         qglClearDepth(depthvalue);CHECKGLERROR
1502 #endif
1503                 }
1504                 if (mask & GL_STENCIL_BUFFER_BIT)
1505                 {
1506                         qglClearStencil(stencilvalue);CHECKGLERROR
1507                 }
1508                 qglClear(mask);CHECKGLERROR
1509                 break;
1510         }
1511 }
1512
1513 void GL_ReadPixelsBGRA(int x, int y, int width, int height, unsigned char *outpixels)
1514 {
1515         switch(vid.renderpath)
1516         {
1517         case RENDERPATH_GL32:
1518         case RENDERPATH_GLES2:
1519                 CHECKGLERROR
1520 #ifndef GL_BGRA
1521                 {
1522                         int i;
1523                         int r;
1524                 //      int g;
1525                         int b;
1526                 //      int a;
1527                         qglReadPixels(x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, outpixels);CHECKGLERROR
1528                         for (i = 0;i < width * height * 4;i += 4)
1529                         {
1530                                 r = outpixels[i+0];
1531                 //              g = outpixels[i+1];
1532                                 b = outpixels[i+2];
1533                 //              a = outpixels[i+3];
1534                                 outpixels[i+0] = b;
1535                 //              outpixels[i+1] = g;
1536                                 outpixels[i+2] = r;
1537                 //              outpixels[i+3] = a;
1538                         }
1539                 }
1540 #else
1541                 qglReadPixels(x, y, width, height, GL_BGRA, GL_UNSIGNED_BYTE, outpixels);CHECKGLERROR
1542 #endif
1543                         break;
1544         }
1545 }
1546
1547 // called at beginning of frame
1548 void R_Mesh_Start(void)
1549 {
1550         BACKENDACTIVECHECK
1551         R_Mesh_SetRenderTargets(0, NULL, NULL, NULL, NULL, NULL);
1552         if (gl_printcheckerror.integer && !gl_paranoid.integer)
1553         {
1554                 Con_Printf("WARNING: gl_printcheckerror is on but gl_paranoid is off, turning it on...\n");
1555                 Cvar_SetValueQuick(&gl_paranoid, 1);
1556         }
1557 }
1558
1559 static qboolean GL_Backend_CompileShader(int programobject, GLenum shadertypeenum, const char *shadertype, int numstrings, const char **strings)
1560 {
1561         int shaderobject;
1562         int shadercompiled;
1563         char compilelog[MAX_INPUTLINE];
1564         shaderobject = qglCreateShader(shadertypeenum);CHECKGLERROR
1565         if (!shaderobject)
1566                 return false;
1567         qglShaderSource(shaderobject, numstrings, strings, NULL);CHECKGLERROR
1568         qglCompileShader(shaderobject);CHECKGLERROR
1569         qglGetShaderiv(shaderobject, GL_COMPILE_STATUS, &shadercompiled);CHECKGLERROR
1570         qglGetShaderInfoLog(shaderobject, sizeof(compilelog), NULL, compilelog);CHECKGLERROR
1571         if (compilelog[0] && ((strstr(compilelog, "error") || strstr(compilelog, "ERROR") || strstr(compilelog, "Error")) || ((strstr(compilelog, "WARNING") || strstr(compilelog, "warning") || strstr(compilelog, "Warning")) && developer.integer) || developer_extra.integer))
1572         {
1573                 int i, j, pretextlines = 0;
1574                 for (i = 0;i < numstrings - 1;i++)
1575                         for (j = 0;strings[i][j];j++)
1576                                 if (strings[i][j] == '\n')
1577                                         pretextlines++;
1578                 Con_Printf("%s shader compile log:\n%s\n(line offset for any above warnings/errors: %i)\n", shadertype, compilelog, pretextlines);
1579         }
1580         if (!shadercompiled)
1581         {
1582                 qglDeleteShader(shaderobject);CHECKGLERROR
1583                 return false;
1584         }
1585         qglAttachShader(programobject, shaderobject);CHECKGLERROR
1586         qglDeleteShader(shaderobject);CHECKGLERROR
1587         return true;
1588 }
1589
1590 unsigned int GL_Backend_CompileProgram(int vertexstrings_count, const char **vertexstrings_list, int geometrystrings_count, const char **geometrystrings_list, int fragmentstrings_count, const char **fragmentstrings_list)
1591 {
1592         GLint programlinked;
1593         GLuint programobject = 0;
1594         char linklog[MAX_INPUTLINE];
1595         CHECKGLERROR
1596
1597         programobject = qglCreateProgram();CHECKGLERROR
1598         if (!programobject)
1599                 return 0;
1600
1601         qglBindAttribLocation(programobject, GLSLATTRIB_POSITION , "Attrib_Position" );
1602         qglBindAttribLocation(programobject, GLSLATTRIB_COLOR    , "Attrib_Color"    );
1603         qglBindAttribLocation(programobject, GLSLATTRIB_TEXCOORD0, "Attrib_TexCoord0");
1604         qglBindAttribLocation(programobject, GLSLATTRIB_TEXCOORD1, "Attrib_TexCoord1");
1605         qglBindAttribLocation(programobject, GLSLATTRIB_TEXCOORD2, "Attrib_TexCoord2");
1606         qglBindAttribLocation(programobject, GLSLATTRIB_TEXCOORD3, "Attrib_TexCoord3");
1607         qglBindAttribLocation(programobject, GLSLATTRIB_TEXCOORD4, "Attrib_TexCoord4");
1608         qglBindAttribLocation(programobject, GLSLATTRIB_TEXCOORD5, "Attrib_TexCoord5");
1609         qglBindAttribLocation(programobject, GLSLATTRIB_TEXCOORD6, "Attrib_SkeletalIndex");
1610         qglBindAttribLocation(programobject, GLSLATTRIB_TEXCOORD7, "Attrib_SkeletalWeight");
1611 #ifndef USE_GLES2
1612         qglBindFragDataLocation(programobject, 0, "dp_FragColor");
1613 #endif
1614         CHECKGLERROR
1615
1616         if (vertexstrings_count && !GL_Backend_CompileShader(programobject, GL_VERTEX_SHADER, "vertex", vertexstrings_count, vertexstrings_list))
1617                 goto cleanup;
1618
1619 #if defined(GL_GEOMETRY_SHADER) && !defined(USE_GLES2)
1620         if (geometrystrings_count && !GL_Backend_CompileShader(programobject, GL_GEOMETRY_SHADER, "geometry", geometrystrings_count, geometrystrings_list))
1621                 goto cleanup;
1622 #endif
1623
1624         if (fragmentstrings_count && !GL_Backend_CompileShader(programobject, GL_FRAGMENT_SHADER, "fragment", fragmentstrings_count, fragmentstrings_list))
1625                 goto cleanup;
1626
1627         qglLinkProgram(programobject);CHECKGLERROR
1628         qglGetProgramiv(programobject, GL_LINK_STATUS, &programlinked);CHECKGLERROR
1629         qglGetProgramInfoLog(programobject, sizeof(linklog), NULL, linklog);CHECKGLERROR
1630
1631         if (linklog[0])
1632         {
1633
1634                 if (strstr(linklog, "error") || strstr(linklog, "ERROR") || strstr(linklog, "Error") || strstr(linklog, "WARNING") || strstr(linklog, "warning") || strstr(linklog, "Warning") || developer_extra.integer)
1635                         Con_DPrintf("program link log:\n%s\n", linklog);
1636
1637                 // software vertex shader is ok but software fragment shader is WAY
1638                 // too slow, fail program if so.
1639                 // NOTE: this string might be ATI specific, but that's ok because the
1640                 // ATI R300 chip (Radeon 9500-9800/X300) is the most likely to use a
1641                 // software fragment shader due to low instruction and dependent
1642                 // texture limits.
1643                 if (strstr(linklog, "fragment shader will run in software"))
1644                         programlinked = false;
1645         }
1646
1647         if (!programlinked)
1648                 goto cleanup;
1649
1650         return programobject;
1651 cleanup:
1652         qglDeleteProgram(programobject);CHECKGLERROR
1653         return 0;
1654 }
1655
1656 void GL_Backend_FreeProgram(unsigned int prog)
1657 {
1658         CHECKGLERROR
1659         qglDeleteProgram(prog);
1660         CHECKGLERROR
1661 }
1662
1663 // renders triangles using vertices from the active arrays
1664 void R_Mesh_Draw(int firstvertex, int numvertices, int firsttriangle, int numtriangles, const int *element3i, const r_meshbuffer_t *element3i_indexbuffer, int element3i_bufferoffset, const unsigned short *element3s, const r_meshbuffer_t *element3s_indexbuffer, int element3s_bufferoffset)
1665 {
1666         unsigned int numelements = numtriangles * 3;
1667         int bufferobject3i;
1668         size_t bufferoffset3i;
1669         int bufferobject3s;
1670         size_t bufferoffset3s;
1671         if (numvertices < 3 || numtriangles < 1)
1672         {
1673                 if (numvertices < 0 || numtriangles < 0 || developer_extra.integer)
1674                         Con_DPrintf("R_Mesh_Draw(%d, %d, %d, %d, %8p, %8p, %8x, %8p, %8p, %8x);\n", firstvertex, numvertices, firsttriangle, numtriangles, (void *)element3i, (void *)element3i_indexbuffer, (int)element3i_bufferoffset, (void *)element3s, (void *)element3s_indexbuffer, (int)element3s_bufferoffset);
1675                 return;
1676         }
1677         // adjust the pointers for firsttriangle
1678         if (element3i)
1679                 element3i += firsttriangle * 3;
1680         if (element3i_indexbuffer)
1681                 element3i_bufferoffset += firsttriangle * 3 * sizeof(*element3i);
1682         if (element3s)
1683                 element3s += firsttriangle * 3;
1684         if (element3s_indexbuffer)
1685                 element3s_bufferoffset += firsttriangle * 3 * sizeof(*element3s);
1686         // upload a dynamic index buffer if needed
1687         if (element3s)
1688         {
1689                 if (!element3s_indexbuffer)
1690                         element3s_indexbuffer = R_BufferData_Store(numelements * sizeof(*element3s), (void *)element3s, R_BUFFERDATA_INDEX16, &element3s_bufferoffset);
1691         }
1692         else if (element3i)
1693         {
1694                 if (!element3i_indexbuffer)
1695                         element3i_indexbuffer = R_BufferData_Store(numelements * sizeof(*element3i), (void *)element3i, R_BUFFERDATA_INDEX32, &element3i_bufferoffset);
1696         }
1697         bufferobject3i = element3i_indexbuffer ? element3i_indexbuffer->bufferobject : 0;
1698         bufferoffset3i = element3i_bufferoffset;
1699         bufferobject3s = element3s_indexbuffer ? element3s_indexbuffer->bufferobject : 0;
1700         bufferoffset3s = element3s_bufferoffset;
1701         r_refdef.stats[r_stat_draws]++;
1702         r_refdef.stats[r_stat_draws_vertices] += numvertices;
1703         r_refdef.stats[r_stat_draws_elements] += numelements;
1704         if (gl_paranoid.integer)
1705         {
1706                 unsigned int i;
1707                 if (element3i)
1708                 {
1709                         for (i = 0;i < (unsigned int) numtriangles * 3;i++)
1710                         {
1711                                 if (element3i[i] < firstvertex || element3i[i] >= firstvertex + numvertices)
1712                                 {
1713                                         Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range %i - %i) in element3i array\n", element3i[i], firstvertex, firstvertex + numvertices);
1714                                         return;
1715                                 }
1716                         }
1717                 }
1718                 if (element3s)
1719                 {
1720                         for (i = 0;i < (unsigned int) numtriangles * 3;i++)
1721                         {
1722                                 if (element3s[i] < firstvertex || element3s[i] >= firstvertex + numvertices)
1723                                 {
1724                                         Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range %i - %i) in element3s array\n", element3s[i], firstvertex, firstvertex + numvertices);
1725                                         return;
1726                                 }
1727                         }
1728                 }
1729         }
1730         if (r_render.integer || r_refdef.draw2dstage)
1731         {
1732                 switch(vid.renderpath)
1733                 {
1734                 case RENDERPATH_GL32:
1735                 case RENDERPATH_GLES2:
1736                         CHECKGLERROR
1737                         if (bufferobject3s)
1738                         {
1739                                 GL_BindEBO(bufferobject3s);
1740                                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_SHORT, (void *)bufferoffset3s);CHECKGLERROR
1741                         }
1742                         else if (bufferobject3i)
1743                         {
1744                                 GL_BindEBO(bufferobject3i);
1745                                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (void *)bufferoffset3i);CHECKGLERROR
1746                         }
1747                         else
1748                         {
1749                                 qglDrawArrays(GL_TRIANGLES, firstvertex, numvertices);CHECKGLERROR
1750                         }
1751                         break;
1752                 }
1753         }
1754 }
1755
1756 // restores backend state, used when done with 3D rendering
1757 void R_Mesh_Finish(void)
1758 {
1759         R_Mesh_SetRenderTargets(0, NULL, NULL, NULL, NULL, NULL);
1760 }
1761
1762 r_meshbuffer_t *R_Mesh_CreateMeshBuffer(const void *data, size_t size, const char *name, qboolean isindexbuffer, qboolean isuniformbuffer, qboolean isdynamic, qboolean isindex16)
1763 {
1764         r_meshbuffer_t *buffer;
1765         buffer = (r_meshbuffer_t *)Mem_ExpandableArray_AllocRecord(&gl_state.meshbufferarray);
1766         memset(buffer, 0, sizeof(*buffer));
1767         buffer->bufferobject = 0;
1768         buffer->devicebuffer = NULL;
1769         buffer->size = size;
1770         buffer->isindexbuffer = isindexbuffer;
1771         buffer->isuniformbuffer = isuniformbuffer;
1772         buffer->isdynamic = isdynamic;
1773         buffer->isindex16 = isindex16;
1774         strlcpy(buffer->name, name, sizeof(buffer->name));
1775         R_Mesh_UpdateMeshBuffer(buffer, data, size, false, 0);
1776         return buffer;
1777 }
1778
1779 void R_Mesh_UpdateMeshBuffer(r_meshbuffer_t *buffer, const void *data, size_t size, qboolean subdata, size_t offset)
1780 {
1781         if (!buffer)
1782                 return;
1783         if (buffer->isindexbuffer)
1784         {
1785                 r_refdef.stats[r_stat_indexbufferuploadcount]++;
1786                 r_refdef.stats[r_stat_indexbufferuploadsize] += (int)size;
1787         }
1788         else
1789         {
1790                 r_refdef.stats[r_stat_vertexbufferuploadcount]++;
1791                 r_refdef.stats[r_stat_vertexbufferuploadsize] += (int)size;
1792         }
1793         if (!subdata)
1794                 buffer->size = size;
1795         switch(vid.renderpath)
1796         {
1797         case RENDERPATH_GL32:
1798         case RENDERPATH_GLES2:
1799                 if (!buffer->bufferobject)
1800                         qglGenBuffers(1, (GLuint *)&buffer->bufferobject);
1801                 CHECKGLERROR
1802                 if (buffer->isuniformbuffer)
1803                         GL_BindUBO(buffer->bufferobject);
1804                 else if (buffer->isindexbuffer)
1805                         GL_BindEBO(buffer->bufferobject);
1806                 else
1807                         GL_BindVBO(buffer->bufferobject);
1808
1809                 {
1810                         int buffertype;
1811                         buffertype = buffer->isindexbuffer ? GL_ELEMENT_ARRAY_BUFFER : GL_ARRAY_BUFFER;
1812 #ifdef GL_UNIFORM_BUFFER
1813                         if (buffer->isuniformbuffer)
1814                                 buffertype = GL_UNIFORM_BUFFER;
1815 #endif
1816                         CHECKGLERROR
1817                         if (subdata)
1818                                 qglBufferSubData(buffertype, offset, size, data);
1819                         else
1820                                 qglBufferData(buffertype, size, data, buffer->isdynamic ? GL_STREAM_DRAW : GL_STATIC_DRAW);
1821                         CHECKGLERROR
1822                 }
1823                 if (buffer->isuniformbuffer)
1824                         GL_BindUBO(0);
1825                 break;
1826         }
1827 }
1828
1829 void R_Mesh_DestroyMeshBuffer(r_meshbuffer_t *buffer)
1830 {
1831         if (!buffer)
1832                 return;
1833         switch(vid.renderpath)
1834         {
1835         case RENDERPATH_GL32:
1836         case RENDERPATH_GLES2:
1837                 // GL clears the binding if we delete something bound
1838                 if (gl_state.uniformbufferobject == buffer->bufferobject)
1839                         gl_state.uniformbufferobject = 0;
1840                 if (gl_state.vertexbufferobject == buffer->bufferobject)
1841                         gl_state.vertexbufferobject = 0;
1842                 if (gl_state.elementbufferobject == buffer->bufferobject)
1843                         gl_state.elementbufferobject = 0;
1844                 CHECKGLERROR
1845                 qglDeleteBuffers(1, (GLuint *)&buffer->bufferobject);CHECKGLERROR
1846                 break;
1847         }
1848         Mem_ExpandableArray_FreeRecord(&gl_state.meshbufferarray, (void *)buffer);
1849 }
1850
1851 static const char *buffertypename[R_BUFFERDATA_COUNT] = {"vertex", "index16", "index32", "uniform"};
1852 void GL_Mesh_ListVBOs(qboolean printeach)
1853 {
1854         int i, endindex;
1855         int type;
1856         int isdynamic;
1857         int index16count, index16mem;
1858         int index32count, index32mem;
1859         int vertexcount, vertexmem;
1860         int uniformcount, uniformmem;
1861         int totalcount, totalmem;
1862         size_t bufferstat[R_BUFFERDATA_COUNT][2][2];
1863         r_meshbuffer_t *buffer;
1864         memset(bufferstat, 0, sizeof(bufferstat));
1865         endindex = (int)Mem_ExpandableArray_IndexRange(&gl_state.meshbufferarray);
1866         for (i = 0;i < endindex;i++)
1867         {
1868                 buffer = (r_meshbuffer_t *) Mem_ExpandableArray_RecordAtIndex(&gl_state.meshbufferarray, i);
1869                 if (!buffer)
1870                         continue;
1871                 if (buffer->isuniformbuffer)
1872                         type = R_BUFFERDATA_UNIFORM;
1873                 else if (buffer->isindexbuffer && buffer->isindex16)
1874                         type = R_BUFFERDATA_INDEX16;
1875                 else if (buffer->isindexbuffer)
1876                         type = R_BUFFERDATA_INDEX32;
1877                 else
1878                         type = R_BUFFERDATA_VERTEX;
1879                 isdynamic = buffer->isdynamic;
1880                 bufferstat[type][isdynamic][0]++;
1881                 bufferstat[type][isdynamic][1] += buffer->size;
1882                 if (printeach)
1883                         Con_Printf("buffer #%i %s = %i bytes (%s %s)\n", i, buffer->name, (int)buffer->size, isdynamic ? "dynamic" : "static", buffertypename[type]);
1884         }
1885         index16count   = (int)(bufferstat[R_BUFFERDATA_INDEX16][0][0] + bufferstat[R_BUFFERDATA_INDEX16][1][0]);
1886         index16mem     = (int)(bufferstat[R_BUFFERDATA_INDEX16][0][1] + bufferstat[R_BUFFERDATA_INDEX16][1][1]);
1887         index32count   = (int)(bufferstat[R_BUFFERDATA_INDEX32][0][0] + bufferstat[R_BUFFERDATA_INDEX32][1][0]);
1888         index32mem     = (int)(bufferstat[R_BUFFERDATA_INDEX32][0][1] + bufferstat[R_BUFFERDATA_INDEX32][1][1]);
1889         vertexcount  = (int)(bufferstat[R_BUFFERDATA_VERTEX ][0][0] + bufferstat[R_BUFFERDATA_VERTEX ][1][0]);
1890         vertexmem    = (int)(bufferstat[R_BUFFERDATA_VERTEX ][0][1] + bufferstat[R_BUFFERDATA_VERTEX ][1][1]);
1891         uniformcount = (int)(bufferstat[R_BUFFERDATA_UNIFORM][0][0] + bufferstat[R_BUFFERDATA_UNIFORM][1][0]);
1892         uniformmem   = (int)(bufferstat[R_BUFFERDATA_UNIFORM][0][1] + bufferstat[R_BUFFERDATA_UNIFORM][1][1]);
1893         totalcount = index16count + index32count + vertexcount + uniformcount;
1894         totalmem = index16mem + index32mem + vertexmem + uniformmem;
1895         Con_Printf("%i 16bit indexbuffers totalling %i bytes (%.3f MB)\n%i 32bit indexbuffers totalling %i bytes (%.3f MB)\n%i vertexbuffers totalling %i bytes (%.3f MB)\n%i uniformbuffers totalling %i bytes (%.3f MB)\ncombined %i buffers totalling %i bytes (%.3fMB)\n", index16count, index16mem, index16mem / 10248576.0, index32count, index32mem, index32mem / 10248576.0, vertexcount, vertexmem, vertexmem / 10248576.0, uniformcount, uniformmem, uniformmem / 10248576.0, totalcount, totalmem, totalmem / 10248576.0);
1896 }
1897
1898
1899
1900 void R_Mesh_VertexPointer(int components, int gltype, size_t stride, const void *pointer, const r_meshbuffer_t *vertexbuffer, size_t bufferoffset)
1901 {
1902         switch(vid.renderpath)
1903         {
1904         case RENDERPATH_GL32:
1905         case RENDERPATH_GLES2:
1906                 if (gl_state.pointer_vertex_components != components || gl_state.pointer_vertex_gltype != gltype || gl_state.pointer_vertex_stride != stride || gl_state.pointer_vertex_pointer != pointer || gl_state.pointer_vertex_vertexbuffer != vertexbuffer || gl_state.pointer_vertex_offset != bufferoffset)
1907                 {
1908                         int bufferobject = vertexbuffer ? vertexbuffer->bufferobject : 0;
1909                         if (!bufferobject && gl_paranoid.integer)
1910                                 Con_DPrintf("Warning: no bufferobject in R_Mesh_VertexPointer(%i, %i, %i, %p, %p, %08x)", components, gltype, (int)stride, pointer, vertexbuffer, (unsigned int)bufferoffset);
1911                         gl_state.pointer_vertex_components = components;
1912                         gl_state.pointer_vertex_gltype = gltype;
1913                         gl_state.pointer_vertex_stride = stride;
1914                         gl_state.pointer_vertex_pointer = pointer;
1915                         gl_state.pointer_vertex_vertexbuffer = vertexbuffer;
1916                         gl_state.pointer_vertex_offset = bufferoffset;
1917                         CHECKGLERROR
1918                         GL_BindVBO(bufferobject);
1919                         // LadyHavoc: special flag added to gltype for unnormalized types
1920                         qglVertexAttribPointer(GLSLATTRIB_POSITION, components, gltype & ~0x80000000, (gltype & 0x80000000) == 0, (GLsizei)stride, bufferobject ? (void *)bufferoffset : pointer);CHECKGLERROR
1921                 }
1922                 break;
1923         }
1924 }
1925
1926 void R_Mesh_ColorPointer(int components, int gltype, size_t stride, const void *pointer, const r_meshbuffer_t *vertexbuffer, size_t bufferoffset)
1927 {
1928         // note: vertexbuffer may be non-NULL even if pointer is NULL, so check
1929         // the pointer only.
1930         switch(vid.renderpath)
1931         {
1932         case RENDERPATH_GL32:
1933         case RENDERPATH_GLES2:
1934                 CHECKGLERROR
1935                 if (pointer)
1936                 {
1937                         // caller wants color array enabled
1938                         int bufferobject = vertexbuffer ? vertexbuffer->bufferobject : 0;
1939                         if (!gl_state.pointer_color_enabled)
1940                         {
1941                                 gl_state.pointer_color_enabled = true;
1942                                 CHECKGLERROR
1943                                 qglEnableVertexAttribArray(GLSLATTRIB_COLOR);CHECKGLERROR
1944                         }
1945                         if (gl_state.pointer_color_components != components || gl_state.pointer_color_gltype != gltype || gl_state.pointer_color_stride != stride || gl_state.pointer_color_pointer != pointer || gl_state.pointer_color_vertexbuffer != vertexbuffer || gl_state.pointer_color_offset != bufferoffset)
1946                         {
1947                                 gl_state.pointer_color_components = components;
1948                                 gl_state.pointer_color_gltype = gltype;
1949                                 gl_state.pointer_color_stride = stride;
1950                                 gl_state.pointer_color_pointer = pointer;
1951                                 gl_state.pointer_color_vertexbuffer = vertexbuffer;
1952                                 gl_state.pointer_color_offset = bufferoffset;
1953                                 CHECKGLERROR
1954                                 GL_BindVBO(bufferobject);
1955                                 // LadyHavoc: special flag added to gltype for unnormalized types
1956                                 qglVertexAttribPointer(GLSLATTRIB_COLOR, components, gltype & ~0x80000000, (gltype & 0x80000000) == 0, (GLsizei)stride, bufferobject ? (void *)bufferoffset : pointer);CHECKGLERROR
1957                         }
1958                 }
1959                 else
1960                 {
1961                         // caller wants color array disabled
1962                         if (gl_state.pointer_color_enabled)
1963                         {
1964                                 gl_state.pointer_color_enabled = false;
1965                                 CHECKGLERROR
1966                                 qglDisableVertexAttribArray(GLSLATTRIB_COLOR);CHECKGLERROR
1967                                 // when color array is on the current color gets trashed, set it again
1968                                 qglVertexAttrib4f(GLSLATTRIB_COLOR, gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);CHECKGLERROR
1969                         }
1970                 }
1971                 break;
1972         }
1973 }
1974
1975 void R_Mesh_TexCoordPointer(unsigned int unitnum, int components, int gltype, size_t stride, const void *pointer, const r_meshbuffer_t *vertexbuffer, size_t bufferoffset)
1976 {
1977         gltextureunit_t *unit = gl_state.units + unitnum;
1978         if (unitnum >= MAX_TEXTUREUNITS)
1979                 Sys_Error("R_Mesh_TexCoordPointer: unitnum %i > max units %i\n", unitnum, MAX_TEXTUREUNITS);
1980         // update array settings
1981         // note: there is no need to check bufferobject here because all cases
1982         // that involve a valid bufferobject also supply a texcoord array
1983         switch(vid.renderpath)
1984         {
1985         case RENDERPATH_GL32:
1986         case RENDERPATH_GLES2:
1987                 CHECKGLERROR
1988                 if (pointer)
1989                 {
1990                         int bufferobject = vertexbuffer ? vertexbuffer->bufferobject : 0;
1991                         // texture array unit is enabled, enable the array
1992                         if (!unit->arrayenabled)
1993                         {
1994                                 unit->arrayenabled = true;
1995                                 qglEnableVertexAttribArray(unitnum+GLSLATTRIB_TEXCOORD0);CHECKGLERROR
1996                         }
1997                         // texcoord array
1998                         if (unit->pointer_texcoord_components != components || unit->pointer_texcoord_gltype != gltype || unit->pointer_texcoord_stride != stride || unit->pointer_texcoord_pointer != pointer || unit->pointer_texcoord_vertexbuffer != vertexbuffer || unit->pointer_texcoord_offset != bufferoffset)
1999                         {
2000                                 unit->pointer_texcoord_components = components;
2001                                 unit->pointer_texcoord_gltype = gltype;
2002                                 unit->pointer_texcoord_stride = stride;
2003                                 unit->pointer_texcoord_pointer = pointer;
2004                                 unit->pointer_texcoord_vertexbuffer = vertexbuffer;
2005                                 unit->pointer_texcoord_offset = bufferoffset;
2006                                 GL_BindVBO(bufferobject);
2007                                 // LadyHavoc: special flag added to gltype for unnormalized types
2008                                 qglVertexAttribPointer(unitnum+GLSLATTRIB_TEXCOORD0, components, gltype & ~0x80000000, (gltype & 0x80000000) == 0, (GLsizei)stride, bufferobject ? (void *)bufferoffset : pointer);CHECKGLERROR
2009                         }
2010                 }
2011                 else
2012                 {
2013                         // texture array unit is disabled, disable the array
2014                         if (unit->arrayenabled)
2015                         {
2016                                 unit->arrayenabled = false;
2017                                 qglDisableVertexAttribArray(unitnum+GLSLATTRIB_TEXCOORD0);CHECKGLERROR
2018                         }
2019                 }
2020                 break;
2021         }
2022 }
2023
2024 int R_Mesh_TexBound(unsigned int unitnum, int id)
2025 {
2026         gltextureunit_t *unit = gl_state.units + unitnum;
2027         if (unitnum >= MAX_TEXTUREUNITS)
2028                 Sys_Error("R_Mesh_TexCoordPointer: unitnum %i > max units %i\n", unitnum, MAX_TEXTUREUNITS);
2029         if (id == GL_TEXTURE_2D)
2030                 return unit->t2d;
2031         if (id == GL_TEXTURE_3D)
2032                 return unit->t3d;
2033         if (id == GL_TEXTURE_CUBE_MAP)
2034                 return unit->tcubemap;
2035         return 0;
2036 }
2037
2038 void R_Mesh_CopyToTexture(rtexture_t *tex, int tx, int ty, int sx, int sy, int width, int height)
2039 {
2040         switch(vid.renderpath)
2041         {
2042         case RENDERPATH_GL32:
2043         case RENDERPATH_GLES2:
2044                 R_Mesh_TexBind(0, tex);
2045                 GL_ActiveTexture(0);CHECKGLERROR
2046                 qglCopyTexSubImage2D(GL_TEXTURE_2D, 0, tx, ty, sx, sy, width, height);CHECKGLERROR
2047                 break;
2048         }
2049 }
2050
2051 void R_Mesh_ClearBindingsForTexture(int texnum)
2052 {
2053         gltextureunit_t *unit;
2054         unsigned int unitnum;
2055         // unbind the texture from any units it is bound on - this prevents accidental reuse of certain textures whose bindings can linger far too long otherwise (e.g. bouncegrid which is a 3D texture) and confuse the driver later.
2056         for (unitnum = 0; unitnum < MAX_TEXTUREUNITS; unitnum++)
2057         {
2058                 unit = gl_state.units + unitnum;
2059                 if (unit->texture && unit->texture->texnum == texnum)
2060                         R_Mesh_TexBind(unitnum, NULL);
2061         }
2062 }
2063
2064 void R_Mesh_TexBind(unsigned int unitnum, rtexture_t *tex)
2065 {
2066         gltextureunit_t *unit = gl_state.units + unitnum;
2067         int texnum;
2068         if (unitnum >= MAX_TEXTUREUNITS)
2069                 Sys_Error("R_Mesh_TexBind: unitnum %i > max units %i\n", unitnum, MAX_TEXTUREUNITS);
2070         switch(vid.renderpath)
2071         {
2072         case RENDERPATH_GL32:
2073         case RENDERPATH_GLES2:
2074                 if (tex)
2075                 {
2076                         texnum = R_GetTexture(tex);
2077                         switch (tex->gltexturetypeenum)
2078                         {
2079                         case GL_TEXTURE_2D:
2080                                 if (unit->t2d != texnum) { GL_ActiveTexture(unitnum);qglBindTexture(GL_TEXTURE_2D, texnum); CHECKGLERROR unit->t2d = texnum; }
2081                                 if (unit->t3d) { GL_ActiveTexture(unitnum); qglBindTexture(GL_TEXTURE_3D, 0); CHECKGLERROR unit->t3d = 0; }
2082                                 if (unit->tcubemap) { GL_ActiveTexture(unitnum); qglBindTexture(GL_TEXTURE_CUBE_MAP, 0); CHECKGLERROR unit->tcubemap = 0; }
2083                                 break;
2084                         case GL_TEXTURE_3D:
2085                                 if (unit->t2d) { GL_ActiveTexture(unitnum); qglBindTexture(GL_TEXTURE_2D, 0); CHECKGLERROR unit->t2d = 0; }
2086                                 if (unit->t3d != texnum) { GL_ActiveTexture(unitnum); qglBindTexture(GL_TEXTURE_3D, texnum); CHECKGLERROR unit->t3d = texnum; }
2087                                 if (unit->tcubemap) { GL_ActiveTexture(unitnum); qglBindTexture(GL_TEXTURE_CUBE_MAP, 0); CHECKGLERROR unit->tcubemap = 0; }
2088                                 break;
2089                         case GL_TEXTURE_CUBE_MAP:
2090                                 if (unit->t2d) { GL_ActiveTexture(unitnum); qglBindTexture(GL_TEXTURE_2D, 0); CHECKGLERROR unit->t2d = 0; }
2091                                 if (unit->t3d) { GL_ActiveTexture(unitnum); qglBindTexture(GL_TEXTURE_3D, 0); CHECKGLERROR unit->t3d = 0; }
2092                                 if (unit->tcubemap != texnum) { GL_ActiveTexture(unitnum); qglBindTexture(GL_TEXTURE_CUBE_MAP, texnum); CHECKGLERROR unit->tcubemap = texnum; }
2093                                 break;
2094                         }
2095                 }
2096                 else
2097                 {
2098                         if (unit->t2d) { GL_ActiveTexture(unitnum); qglBindTexture(GL_TEXTURE_2D, 0); CHECKGLERROR unit->t2d = 0; }
2099                         if (unit->t3d) { GL_ActiveTexture(unitnum); qglBindTexture(GL_TEXTURE_3D, 0); CHECKGLERROR unit->t3d = 0; }
2100                         if (unit->tcubemap) { GL_ActiveTexture(unitnum); qglBindTexture(GL_TEXTURE_CUBE_MAP, 0); CHECKGLERROR unit->tcubemap = 0; }
2101                 }
2102         }
2103         unit->texture = tex;
2104 }
2105
2106 void R_Mesh_ResetTextureState(void)
2107 {
2108 #if 0
2109         unsigned int unitnum;
2110
2111         BACKENDACTIVECHECK
2112
2113         for (unitnum = 0;unitnum < MAX_TEXTUREUNITS;unitnum++)
2114                 R_Mesh_TexBind(unitnum, NULL);
2115 #endif
2116 }
2117
2118 void R_Mesh_PrepareVertices_Vertex3f(int numvertices, const float *vertex3f, const r_meshbuffer_t *vertexbuffer, int bufferoffset)
2119 {
2120         // upload temporary vertexbuffer for this rendering
2121         if (!vertexbuffer)
2122                 vertexbuffer = R_BufferData_Store(numvertices * sizeof(float[3]), (void *)vertex3f, R_BUFFERDATA_VERTEX, &bufferoffset);
2123         R_Mesh_VertexPointer(     3, GL_FLOAT        , sizeof(float[3])        , vertex3f  , vertexbuffer     , bufferoffset           );
2124         R_Mesh_ColorPointer(      4, GL_FLOAT        , sizeof(float[4])        , NULL      , NULL             , 0                      );
2125         R_Mesh_TexCoordPointer(0, 2, GL_FLOAT        , sizeof(float[2])        , NULL      , NULL             , 0                      );
2126         R_Mesh_TexCoordPointer(1, 3, GL_FLOAT        , sizeof(float[3])        , NULL      , NULL             , 0                      );
2127         R_Mesh_TexCoordPointer(2, 3, GL_FLOAT        , sizeof(float[3])        , NULL      , NULL             , 0                      );
2128         R_Mesh_TexCoordPointer(3, 3, GL_FLOAT        , sizeof(float[3])        , NULL      , NULL             , 0                      );
2129         R_Mesh_TexCoordPointer(4, 2, GL_FLOAT        , sizeof(float[2])        , NULL      , NULL             , 0                      );
2130         R_Mesh_TexCoordPointer(5, 2, GL_FLOAT        , sizeof(float[2])        , NULL      , NULL             , 0                      );
2131         R_Mesh_TexCoordPointer(6, 4, GL_UNSIGNED_BYTE, sizeof(unsigned char[4]), NULL      , NULL             , 0                      );
2132         R_Mesh_TexCoordPointer(7, 4, GL_UNSIGNED_BYTE, sizeof(unsigned char[4]), NULL      , NULL             , 0                      );
2133 }
2134
2135 void R_Mesh_PrepareVertices_Generic_Arrays(int numvertices, const float *vertex3f, const float *color4f, const float *texcoord2f)
2136 {
2137         r_meshbuffer_t *buffer_vertex3f = NULL;
2138         r_meshbuffer_t *buffer_color4f = NULL;
2139         r_meshbuffer_t *buffer_texcoord2f = NULL;
2140         int bufferoffset_vertex3f = 0;
2141         int bufferoffset_color4f = 0;
2142         int bufferoffset_texcoord2f = 0;
2143         if (color4f)
2144                 buffer_color4f    = R_BufferData_Store(numvertices * sizeof(float[4]), color4f   , R_BUFFERDATA_VERTEX, &bufferoffset_color4f   );
2145         if (vertex3f)
2146                 buffer_vertex3f   = R_BufferData_Store(numvertices * sizeof(float[3]), vertex3f  , R_BUFFERDATA_VERTEX, &bufferoffset_vertex3f  );
2147         if (texcoord2f)
2148                 buffer_texcoord2f = R_BufferData_Store(numvertices * sizeof(float[2]), texcoord2f, R_BUFFERDATA_VERTEX, &bufferoffset_texcoord2f);
2149         R_Mesh_VertexPointer(     3, GL_FLOAT        , sizeof(float[3])        , vertex3f          , buffer_vertex3f          , bufferoffset_vertex3f          );
2150         R_Mesh_ColorPointer(      4, GL_FLOAT        , sizeof(float[4])        , color4f           , buffer_color4f           , bufferoffset_color4f           );
2151         R_Mesh_TexCoordPointer(0, 2, GL_FLOAT        , sizeof(float[2])        , texcoord2f        , buffer_texcoord2f        , bufferoffset_texcoord2f        );
2152         R_Mesh_TexCoordPointer(1, 3, GL_FLOAT        , sizeof(float[3])        , NULL              , NULL                     , 0                              );
2153         R_Mesh_TexCoordPointer(2, 3, GL_FLOAT        , sizeof(float[3])        , NULL              , NULL                     , 0                              );
2154         R_Mesh_TexCoordPointer(3, 3, GL_FLOAT        , sizeof(float[3])        , NULL              , NULL                     , 0                              );
2155         R_Mesh_TexCoordPointer(4, 2, GL_FLOAT        , sizeof(float[2])        , NULL              , NULL                     , 0                              );
2156         R_Mesh_TexCoordPointer(5, 2, GL_FLOAT        , sizeof(float[2])        , NULL              , NULL                     , 0                              );
2157         R_Mesh_TexCoordPointer(6, 4, GL_UNSIGNED_BYTE, sizeof(unsigned char[4]), NULL              , NULL                     , 0                              );
2158         R_Mesh_TexCoordPointer(7, 4, GL_UNSIGNED_BYTE, sizeof(unsigned char[4]), NULL              , NULL                     , 0                              );
2159 }
2160
2161 void R_Mesh_PrepareVertices_Mesh_Arrays(int numvertices, const float *vertex3f, const float *svector3f, const float *tvector3f, const float *normal3f, const float *color4f, const float *texcoordtexture2f, const float *texcoordlightmap2f)
2162 {
2163         r_meshbuffer_t *buffer_vertex3f = NULL;
2164         r_meshbuffer_t *buffer_color4f = NULL;
2165         r_meshbuffer_t *buffer_texcoordtexture2f = NULL;
2166         r_meshbuffer_t *buffer_svector3f = NULL;
2167         r_meshbuffer_t *buffer_tvector3f = NULL;
2168         r_meshbuffer_t *buffer_normal3f = NULL;
2169         r_meshbuffer_t *buffer_texcoordlightmap2f = NULL;
2170         int bufferoffset_vertex3f = 0;
2171         int bufferoffset_color4f = 0;
2172         int bufferoffset_texcoordtexture2f = 0;
2173         int bufferoffset_svector3f = 0;
2174         int bufferoffset_tvector3f = 0;
2175         int bufferoffset_normal3f = 0;
2176         int bufferoffset_texcoordlightmap2f = 0;
2177         if (color4f)
2178                 buffer_color4f            = R_BufferData_Store(numvertices * sizeof(float[4]), color4f           , R_BUFFERDATA_VERTEX, &bufferoffset_color4f           );
2179         if (vertex3f)
2180                 buffer_vertex3f           = R_BufferData_Store(numvertices * sizeof(float[3]), vertex3f          , R_BUFFERDATA_VERTEX, &bufferoffset_vertex3f          );
2181         if (svector3f)
2182                 buffer_svector3f          = R_BufferData_Store(numvertices * sizeof(float[3]), svector3f         , R_BUFFERDATA_VERTEX, &bufferoffset_svector3f         );
2183         if (tvector3f)
2184                 buffer_tvector3f          = R_BufferData_Store(numvertices * sizeof(float[3]), tvector3f         , R_BUFFERDATA_VERTEX, &bufferoffset_tvector3f         );
2185         if (normal3f)
2186                 buffer_normal3f           = R_BufferData_Store(numvertices * sizeof(float[3]), normal3f          , R_BUFFERDATA_VERTEX, &bufferoffset_normal3f          );
2187         if (texcoordtexture2f)
2188                 buffer_texcoordtexture2f  = R_BufferData_Store(numvertices * sizeof(float[2]), texcoordtexture2f , R_BUFFERDATA_VERTEX, &bufferoffset_texcoordtexture2f );
2189         if (texcoordlightmap2f)
2190                 buffer_texcoordlightmap2f = R_BufferData_Store(numvertices * sizeof(float[2]), texcoordlightmap2f, R_BUFFERDATA_VERTEX, &bufferoffset_texcoordlightmap2f);
2191         R_Mesh_VertexPointer(     3, GL_FLOAT        , sizeof(float[3])        , vertex3f          , buffer_vertex3f          , bufferoffset_vertex3f          );
2192         R_Mesh_ColorPointer(      4, GL_FLOAT        , sizeof(float[4])        , color4f           , buffer_color4f           , bufferoffset_color4f           );
2193         R_Mesh_TexCoordPointer(0, 2, GL_FLOAT        , sizeof(float[2])        , texcoordtexture2f , buffer_texcoordtexture2f , bufferoffset_texcoordtexture2f );
2194         R_Mesh_TexCoordPointer(1, 3, GL_FLOAT        , sizeof(float[3])        , svector3f         , buffer_svector3f         , bufferoffset_svector3f         );
2195         R_Mesh_TexCoordPointer(2, 3, GL_FLOAT        , sizeof(float[3])        , tvector3f         , buffer_tvector3f         , bufferoffset_tvector3f         );
2196         R_Mesh_TexCoordPointer(3, 3, GL_FLOAT        , sizeof(float[3])        , normal3f          , buffer_normal3f          , bufferoffset_normal3f          );
2197         R_Mesh_TexCoordPointer(4, 2, GL_FLOAT        , sizeof(float[2])        , texcoordlightmap2f, buffer_texcoordlightmap2f, bufferoffset_texcoordlightmap2f);
2198         R_Mesh_TexCoordPointer(5, 2, GL_FLOAT        , sizeof(float[2])        , NULL              , NULL                     , 0                              );
2199         R_Mesh_TexCoordPointer(6, 4, GL_UNSIGNED_BYTE, sizeof(unsigned char[4]), NULL              , NULL                     , 0                              );
2200         R_Mesh_TexCoordPointer(7, 4, GL_UNSIGNED_BYTE, sizeof(unsigned char[4]), NULL              , NULL                     , 0                              );
2201 }
2202
2203 void GL_BlendEquationSubtract(qboolean negated)
2204 {
2205         CHECKGLERROR
2206         if(negated)
2207         {
2208                 switch(vid.renderpath)
2209                 {
2210                 case RENDERPATH_GL32:
2211                 case RENDERPATH_GLES2:
2212                         qglBlendEquation(GL_FUNC_REVERSE_SUBTRACT);CHECKGLERROR
2213                         break;
2214                 }
2215         }
2216         else
2217         {
2218                 switch(vid.renderpath)
2219                 {
2220                 case RENDERPATH_GL32:
2221                 case RENDERPATH_GLES2:
2222                         qglBlendEquation(GL_FUNC_ADD);CHECKGLERROR
2223                         break;
2224                 }
2225         }
2226 }