gl_backend.c

   1
   2 #include "quakedef.h"
   3 #include "image.h"
   4 #include "jpeg.h"
   5
   6 cvar_t gl_mesh_maxverts = {0, "gl_mesh_maxverts", "21760"};
   7 cvar_t gl_mesh_floatcolors = {0, "gl_mesh_floatcolors", "1"};
   8 cvar_t gl_mesh_drawrangeelements = {0, "gl_mesh_drawrangeelements", "1"};
   9 cvar_t gl_mesh_vertex_array_range = {0, "gl_mesh_vertex_array_range", "0"};
  10 cvar_t gl_mesh_vertex_array_range_readfrequency = {0, "gl_mesh_vertex_array_range_readfrequency", "0.2"};
  11 cvar_t gl_mesh_vertex_array_range_writefrequency = {0, "gl_mesh_vertex_array_range_writefrequency", "0.2"};
  12 cvar_t gl_mesh_vertex_array_range_priority = {0, "gl_mesh_vertex_array_range_priority", "0.7"};
  13 cvar_t gl_delayfinish = {CVAR_SAVE, "gl_delayfinish", "0"};
  14
  15 cvar_t r_render = {0, "r_render", "1"};
  16 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1"}; // whether or not to use dithering
  17 cvar_t gl_lockarrays = {0, "gl_lockarrays", "1"};
  18
  19 int gl_maxdrawrangeelementsvertices;
  20 int gl_maxdrawrangeelementsindices;
  21
  22 #ifdef DEBUGGL
  23 int errornumber = 0;
  24
  25 void GL_PrintError(int errornumber, char *filename, int linenumber)
  26 {
  27         switch(errornumber)
  28         {
  29 #ifdef GL_INVALID_ENUM
  30         case GL_INVALID_ENUM:
  31                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  32                 break;
  33 #endif
  34 #ifdef GL_INVALID_VALUE
  35         case GL_INVALID_VALUE:
  36                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  37                 break;
  38 #endif
  39 #ifdef GL_INVALID_OPERATION
  40         case GL_INVALID_OPERATION:
  41                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  42                 break;
  43 #endif
  44 #ifdef GL_STACK_OVERFLOW
  45         case GL_STACK_OVERFLOW:
  46                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  47                 break;
  48 #endif
  49 #ifdef GL_STACK_UNDERFLOW
  50         case GL_STACK_UNDERFLOW:
  51                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  52                 break;
  53 #endif
  54 #ifdef GL_OUT_OF_MEMORY
  55         case GL_OUT_OF_MEMORY:
  56                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  57                 break;
  58 #endif
  59 #ifdef GL_TABLE_TOO_LARGE
  60         case GL_TABLE_TOO_LARGE:
  61                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  62                 break;
  63 #endif
  64         default:
  65                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  66                 break;
  67         }
  68 }
  69 #endif
  70
  71 #define BACKENDACTIVECHECK if (!backendactive) Sys_Error("GL backend function called when backend is not active\n");
  72
  73 int c_meshs, c_meshelements;
  74
  75 void SCR_ScreenShot_f (void);
  76
  77 // these are externally accessible
  78 int r_lightmapscalebit;
  79 float r_colorscale;
  80 GLfloat *varray_vertex3f, *varray_buf_vertex3f;
  81 GLfloat *varray_color4f, *varray_buf_color4f;
  82 GLfloat *varray_texcoord3f[MAX_TEXTUREUNITS], *varray_buf_texcoord3f[MAX_TEXTUREUNITS];
  83 GLfloat *varray_texcoord2f[MAX_TEXTUREUNITS], *varray_buf_texcoord2f[MAX_TEXTUREUNITS];
  84 static qbyte *varray_color4b, *varray_buf_color4b;
  85 int mesh_maxverts;
  86 int mesh_var;
  87 float mesh_var_readfrequency;
  88 float mesh_var_writefrequency;
  89 float mesh_var_priority;
  90 int varray_offset = 0, varray_offsetnext = 0;
  91 GLuint *varray_buf_elements3i;
  92 int mesh_maxelements = 3072;
  93
  94 static matrix4x4_t backend_viewmatrix;
  95 static matrix4x4_t backend_modelmatrix;
  96 static matrix4x4_t backend_modelviewmatrix;
  97 static matrix4x4_t backend_glmodelviewmatrix;
  98 static matrix4x4_t backend_projectmatrix;
  99
 100 static int backendunits, backendactive;
 101 static mempool_t *gl_backend_mempool;
 102
 103 /*
 104 note: here's strip order for a terrain row:
 105 0--1--2--3--4
 106 |\ |\ |\ |\ |
 107 | \| \| \| \|
 108 A--B--C--D--E
 109
 110 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
 111
 112 *elements++ = i + row;
 113 *elements++ = i;
 114 *elements++ = i + row + 1;
 115 *elements++ = i;
 116 *elements++ = i + 1;
 117 *elements++ = i + row + 1;
 118 */
 119
 120 void GL_Backend_AllocElementsArray(void)
 121 {
 122         if (varray_buf_elements3i)
 123                 Mem_Free(varray_buf_elements3i);
 124         varray_buf_elements3i = Mem_Alloc(gl_backend_mempool, mesh_maxelements * sizeof(GLuint));
 125 }
 126
 127 void GL_Backend_FreeElementArray(void)
 128 {
 129         if (varray_buf_elements3i)
 130                 Mem_Free(varray_buf_elements3i);
 131         varray_buf_elements3i = NULL;
 132 }
 133
 134 void GL_Backend_CheckCvars(void)
 135 {
 136         // 21760 is (65536 / 3) rounded off to a multiple of 128
 137         if (gl_mesh_maxverts.integer < 1024)
 138                 Cvar_SetValueQuick(&gl_mesh_maxverts, 1024);
 139         if (gl_mesh_maxverts.integer > 21760)
 140                 Cvar_SetValueQuick(&gl_mesh_maxverts, 21760);
 141         if (gl_mesh_vertex_array_range.integer && !gl_support_var)
 142                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range, 0);
 143         if (gl_mesh_vertex_array_range_readfrequency.value < 0)
 144                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_readfrequency, 0);
 145         if (gl_mesh_vertex_array_range_readfrequency.value > 1)
 146                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_readfrequency, 1);
 147         if (gl_mesh_vertex_array_range_writefrequency.value < 0)
 148                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_writefrequency, 0);
 149         if (gl_mesh_vertex_array_range_writefrequency.value > 1)
 150                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_writefrequency, 1);
 151         if (gl_mesh_vertex_array_range_priority.value < 0)
 152                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_priority, 0);
 153         if (gl_mesh_vertex_array_range_priority.value > 1)
 154                 Cvar_SetValueQuick(&gl_mesh_vertex_array_range_priority, 1);
 155 }
 156
 157 int polygonelements[768];
 158
 159 void GL_Backend_AllocArrays(void)
 160 {
 161         int i, size;
 162         qbyte *data;
 163
 164         if (!gl_backend_mempool)
 165         {
 166                 gl_backend_mempool = Mem_AllocPool("GL_Backend");
 167                 varray_buf_vertex3f = NULL;
 168                 varray_buf_color4f = NULL;
 169                 varray_buf_color4b = NULL;
 170                 varray_buf_elements3i = NULL;
 171                 for (i = 0;i < MAX_TEXTUREUNITS;i++)
 172                         varray_buf_texcoord3f[i] = varray_buf_texcoord2f[i] = NULL;
 173         }
 174
 175         mesh_maxverts = gl_mesh_maxverts.integer;
 176         mesh_var = gl_mesh_vertex_array_range.integer;
 177         mesh_var_readfrequency = gl_mesh_vertex_array_range_readfrequency.value;
 178         mesh_var_writefrequency = gl_mesh_vertex_array_range_writefrequency.value;
 179         mesh_var_priority = gl_mesh_vertex_array_range_priority.value;
 180
 181         if (varray_buf_vertex3f)
 182                 VID_FreeVertexArrays(varray_buf_vertex3f);
 183         varray_buf_vertex3f = NULL;
 184         varray_buf_color4f = NULL;
 185         varray_buf_color4b = NULL;
 186         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 187                 varray_buf_texcoord3f[i] = varray_buf_texcoord2f[i] = NULL;
 188
 189         size = mesh_maxverts * (sizeof(float[3]) + sizeof(float[4]) + sizeof(qbyte[4]) + (sizeof(float[3]) + sizeof(float[2])) * backendunits);
 190         data = VID_AllocVertexArrays(gl_backend_mempool, size, gl_mesh_vertex_array_range.integer, gl_mesh_vertex_array_range_readfrequency.value, gl_mesh_vertex_array_range_writefrequency.value, gl_mesh_vertex_array_range_priority.value);
 191         varray_buf_vertex3f = (void *)data;data += sizeof(float[3]) * mesh_maxverts;
 192         varray_buf_color4f = (void *)data;data += sizeof(float[4]) * mesh_maxverts;
 193         for (i = 0;i < backendunits;i++)
 194         {
 195                 varray_buf_texcoord3f[i] = (void *)data;data += sizeof(float[3]) * mesh_maxverts;
 196                 varray_buf_texcoord2f[i] = (void *)data;data += sizeof(float[2]) * mesh_maxverts;
 197         }
 198         for (;i < MAX_TEXTUREUNITS;i++)
 199                 varray_buf_texcoord3f[i] = varray_buf_texcoord2f[i] = NULL;
 200         varray_buf_color4b = (void *)data;data += sizeof(qbyte[4]) * mesh_maxverts;
 201
 202         GL_Backend_AllocElementsArray();
 203
 204         if (gl_support_var)
 205         {
 206                 CHECKGLERROR
 207                 qglVertexArrayRangeNV(size, varray_buf_vertex3f);
 208                 CHECKGLERROR
 209                 qglEnableClientState(GL_VERTEX_ARRAY_RANGE_NV);
 210                 CHECKGLERROR
 211         }
 212 }
 213
 214 void GL_Backend_FreeArrays(void)
 215 {
 216         int i;
 217
 218         if (gl_support_var)
 219         {
 220                 CHECKGLERROR
 221                 qglDisableClientState(GL_VERTEX_ARRAY_RANGE_NV);
 222                 CHECKGLERROR
 223         }
 224
 225         if (varray_buf_vertex3f)
 226                 VID_FreeVertexArrays(varray_buf_vertex3f);
 227         varray_buf_vertex3f = NULL;
 228         varray_buf_color4f = NULL;
 229         varray_buf_color4b = NULL;
 230         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 231                 varray_buf_texcoord3f[i] = varray_buf_texcoord2f[i] = NULL;
 232         varray_buf_elements3i = NULL;
 233
 234         Mem_FreePool(&gl_backend_mempool);
 235 }
 236
 237 static void gl_backend_start(void)
 238 {
 239         GL_Backend_CheckCvars();
 240
 241         Con_Printf("OpenGL Backend started with gl_mesh_maxverts %i\n", gl_mesh_maxverts.integer);
 242         if (qglDrawRangeElements != NULL)
 243         {
 244                 CHECKGLERROR
 245                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 246                 CHECKGLERROR
 247                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 248                 CHECKGLERROR
 249                 Con_Printf("glDrawRangeElements detected (max vertices %i, max indices %i)\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 250         }
 251         if (strstr(gl_renderer, "3Dfx"))
 252         {
 253                 Con_Printf("3Dfx driver detected, forcing gl_mesh_floatcolors to 0 to prevent crashs\n");
 254                 Cvar_SetValueQuick(&gl_mesh_floatcolors, 0);
 255         }
 256
 257         backendunits = min(MAX_TEXTUREUNITS, gl_textureunits);
 258
 259         GL_Backend_AllocArrays();
 260
 261         backendactive = true;
 262 }
 263
 264 static void gl_backend_shutdown(void)
 265 {
 266         backendunits = 0;
 267         backendactive = false;
 268
 269         Con_Printf("OpenGL Backend shutting down\n");
 270
 271         GL_Backend_FreeArrays();
 272 }
 273
 274 void GL_Backend_ResizeArrays(int numvertices)
 275 {
 276         Cvar_SetValueQuick(&gl_mesh_maxverts, numvertices);
 277         GL_Backend_CheckCvars();
 278         mesh_maxverts = gl_mesh_maxverts.integer;
 279         GL_Backend_AllocArrays();
 280 }
 281
 282 static void gl_backend_newmap(void)
 283 {
 284 }
 285
 286 void gl_backend_init(void)
 287 {
 288         int i;
 289
 290         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 291         {
 292                 polygonelements[i * 3 + 0] = 0;
 293                 polygonelements[i * 3 + 1] = i + 1;
 294                 polygonelements[i * 3 + 2] = i + 2;
 295         }
 296
 297         Cvar_RegisterVariable(&r_render);
 298         Cvar_RegisterVariable(&gl_dither);
 299         Cvar_RegisterVariable(&gl_lockarrays);
 300         Cvar_RegisterVariable(&gl_delayfinish);
 301 #ifdef NORENDER
 302         Cvar_SetValue("r_render", 0);
 303 #endif
 304
 305         Cvar_RegisterVariable(&gl_mesh_maxverts);
 306         Cvar_RegisterVariable(&gl_mesh_floatcolors);
 307         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 308         Cvar_RegisterVariable(&gl_mesh_vertex_array_range);
 309         Cvar_RegisterVariable(&gl_mesh_vertex_array_range_readfrequency);
 310         Cvar_RegisterVariable(&gl_mesh_vertex_array_range_writefrequency);
 311         Cvar_RegisterVariable(&gl_mesh_vertex_array_range_priority);
 312         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 313 }
 314
 315 void GL_SetupView_ViewPort (int x, int y, int width, int height)
 316 {
 317         if (!r_render.integer)
 318                 return;
 319
 320         // y is weird beause OpenGL is bottom to top, we use top to bottom
 321         qglViewport(x, vid.realheight - (y + height), width, height);
 322         CHECKGLERROR
 323 }
 324
 325 void GL_SetupView_Orientation_Identity (void)
 326 {
 327         Matrix4x4_CreateIdentity(&backend_viewmatrix);
 328         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 329 }
 330
 331 void GL_SetupView_Orientation_FromEntity (vec3_t origin, vec3_t angles)
 332 {
 333         Matrix4x4_CreateRotate(&backend_viewmatrix, -90, 1, 0, 0);
 334         Matrix4x4_ConcatRotate(&backend_viewmatrix, 90, 0, 0, 1);
 335         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[2], 1, 0, 0);
 336         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[0], 0, 1, 0);
 337         Matrix4x4_ConcatRotate(&backend_viewmatrix, -angles[1], 0, 0, 1);
 338         Matrix4x4_ConcatTranslate(&backend_viewmatrix, -origin[0], -origin[1], -origin[2]);
 339         memset(&backend_modelmatrix, 0, sizeof(backend_modelmatrix));
 340 }
 341
 342 void GL_SetupView_Mode_Perspective (double fovx, double fovy, double zNear, double zFar)
 343 {
 344         double xmax, ymax;
 345
 346         if (!r_render.integer)
 347                 return;
 348
 349         // set up viewpoint
 350         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 351         qglLoadIdentity();CHECKGLERROR
 352         // pyramid slopes
 353         xmax = zNear * tan(fovx * M_PI / 360.0);
 354         ymax = zNear * tan(fovy * M_PI / 360.0);
 355         // set view pyramid
 356         qglFrustum(-xmax, xmax, -ymax, ymax, zNear, zFar);CHECKGLERROR
 357         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 358         GL_SetupView_Orientation_Identity();
 359 }
 360
 361 void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double fovx, double fovy, double zNear)
 362 {
 363         float nudge, m[16];
 364
 365         if (!r_render.integer)
 366                 return;
 367
 368         // set up viewpoint
 369         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 370         qglLoadIdentity();CHECKGLERROR
 371         // set view pyramid
 372         nudge = 1.0 - 1.0 / (1<<23);
 373         m[ 0] = 1.0 / tan(fovx * M_PI / 360.0);
 374         m[ 1] = 0;
 375         m[ 2] = 0;
 376         m[ 3] = 0;
 377         m[ 4] = 0;
 378         m[ 5] = 1.0 / tan(fovy * M_PI / 360.0);
 379         m[ 6] = 0;
 380         m[ 7] = 0;
 381         m[ 8] = 0;
 382         m[ 9] = 0;
 383         m[10] = -1 * nudge;
 384         m[11] = -1 * nudge;
 385         m[12] = 0;
 386         m[13] = 0;
 387         m[14] = -2 * zNear * nudge;
 388         m[15] = 0;
 389         qglLoadMatrixf(m);
 390         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 391         GL_SetupView_Orientation_Identity();
 392         backend_projectmatrix.m[0][0] = m[0];
 393         backend_projectmatrix.m[1][0] = m[1];
 394         backend_projectmatrix.m[2][0] = m[2];
 395         backend_projectmatrix.m[3][0] = m[3];
 396         backend_projectmatrix.m[0][1] = m[4];
 397         backend_projectmatrix.m[1][1] = m[5];
 398         backend_projectmatrix.m[2][1] = m[6];
 399         backend_projectmatrix.m[3][1] = m[7];
 400         backend_projectmatrix.m[0][2] = m[8];
 401         backend_projectmatrix.m[1][2] = m[9];
 402         backend_projectmatrix.m[2][2] = m[10];
 403         backend_projectmatrix.m[3][2] = m[11];
 404         backend_projectmatrix.m[0][3] = m[12];
 405         backend_projectmatrix.m[1][3] = m[13];
 406         backend_projectmatrix.m[2][3] = m[14];
 407         backend_projectmatrix.m[3][3] = m[15];
 408 }
 409
 410 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
 411 {
 412         if (!r_render.integer)
 413                 return;
 414
 415         // set up viewpoint
 416         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 417         qglLoadIdentity();CHECKGLERROR
 418         qglOrtho(x1, x2, y2, y1, zNear, zFar);
 419         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 420         GL_SetupView_Orientation_Identity();
 421 }
 422
 423 typedef struct gltextureunit_s
 424 {
 425         int t1d, t2d, t3d, tcubemap;
 426         int arrayenabled, arrayis3d;
 427         float rgbscale, alphascale;
 428         int combinergb, combinealpha;
 429         // FIXME: add more combine stuff
 430 }
 431 gltextureunit_t;
 432
 433 static struct
 434 {
 435         int blendfunc1;
 436         int blendfunc2;
 437         int blend;
 438         GLboolean depthmask;
 439         int depthdisable;
 440         int unit;
 441         int clientunit;
 442         gltextureunit_t units[MAX_TEXTUREUNITS];
 443         int colorarray;
 444 }
 445 gl_state;
 446
 447 void GL_SetupTextureState(void)
 448 {
 449         int i;
 450         gltextureunit_t *unit;
 451         for (i = 0;i < backendunits;i++)
 452         {
 453                 if (qglActiveTexture)
 454                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 455                 if (qglClientActiveTexture)
 456                         qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 457                 unit = gl_state.units + i;
 458                 unit->t1d = 0;
 459                 unit->t2d = 0;
 460                 unit->t3d = 0;
 461                 unit->tcubemap = 0;
 462                 unit->rgbscale = 1;
 463                 unit->alphascale = 1;
 464                 unit->combinergb = GL_MODULATE;
 465                 unit->combinealpha = GL_MODULATE;
 466                 unit->arrayenabled = false;
 467                 unit->arrayis3d = false;
 468                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 469                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), varray_buf_texcoord2f[i]);CHECKGLERROR
 470                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 471                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 472                 if (gl_texture3d)
 473                 {
 474                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 475                 }
 476                 if (gl_texturecubemap)
 477                 {
 478                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 479                 }
 480                 if (gl_combine.integer)
 481                 {
 482                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 483                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 484                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 485                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 486                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 487                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 488                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 489                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 490                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 491                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 492                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 493                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 494                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 495                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 496                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 497                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 498                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 499                 }
 500                 else
 501                 {
 502                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 503                 }
 504         }
 505 }
 506
 507 void GL_Backend_ResetState(void)
 508 {
 509         memset(&gl_state, 0, sizeof(gl_state));
 510         gl_state.depthdisable = false;
 511         gl_state.blendfunc1 = GL_ONE;
 512         gl_state.blendfunc2 = GL_ZERO;
 513         gl_state.blend = false;
 514         gl_state.depthmask = GL_TRUE;
 515         gl_state.colorarray = false;
 516
 517         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 518         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 519
 520         qglEnable(GL_CULL_FACE);CHECKGLERROR
 521         qglCullFace(GL_FRONT);CHECKGLERROR
 522         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 523         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 524         qglDisable(GL_BLEND);CHECKGLERROR
 525         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 526         qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), varray_buf_vertex3f);CHECKGLERROR
 527         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 528         if (gl_mesh_floatcolors.integer)
 529         {
 530                 qglColorPointer(4, GL_FLOAT, sizeof(float[4]), varray_buf_color4f);CHECKGLERROR
 531         }
 532         else
 533         {
 534                 qglColorPointer(4, GL_UNSIGNED_BYTE, sizeof(qbyte[4]), varray_buf_color4b);CHECKGLERROR
 535         }
 536         GL_Color(1, 1, 1, 1);
 537
 538         GL_SetupTextureState();
 539 }
 540
 541 void GL_UseColorArray(void)
 542 {
 543         if (!gl_state.colorarray)
 544         {
 545                 gl_state.colorarray = true;
 546                 qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 547         }
 548 }
 549
 550 void GL_Color(float cr, float cg, float cb, float ca)
 551 {
 552         if (gl_state.colorarray)
 553         {
 554                 gl_state.colorarray = false;
 555                 qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 556         }
 557         qglColor4f(cr, cg, cb, ca);
 558 }
 559
 560 void GL_TransformToScreen(const vec4_t in, vec4_t out)
 561 {
 562         vec4_t temp;
 563         float iw;
 564         Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
 565         Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
 566         iw = 1.0f / out[3];
 567         out[0] = r_refdef.x + (out[0] * iw + 1.0f) * r_refdef.width * 0.5f;
 568         out[1] = r_refdef.y + (out[1] * iw + 1.0f) * r_refdef.height * 0.5f;
 569         out[2] = out[2] * iw;
 570 }
 571
 572 // called at beginning of frame
 573 void R_Mesh_Start(void)
 574 {
 575         BACKENDACTIVECHECK
 576
 577         CHECKGLERROR
 578
 579         GL_Backend_CheckCvars();
 580         if (mesh_maxverts != gl_mesh_maxverts.integer
 581          || mesh_var != gl_mesh_vertex_array_range.integer
 582          || mesh_var_readfrequency != gl_mesh_vertex_array_range_readfrequency.value
 583          || mesh_var_writefrequency != gl_mesh_vertex_array_range_writefrequency.value
 584          || mesh_var_priority != gl_mesh_vertex_array_range_priority.value)
 585                 GL_Backend_ResizeArrays(gl_mesh_maxverts.integer);
 586
 587         GL_Backend_ResetState();
 588
 589         if (mesh_var)
 590         {
 591                 CHECKGLERROR
 592                 qglFlushVertexArrayRangeNV();
 593                 CHECKGLERROR
 594         }
 595         varray_offset = 0;
 596 }
 597
 598 int gl_backend_rebindtextures;
 599
 600 void GL_ConvertColorsFloatToByte(int numverts)
 601 {
 602         int i, k, total;
 603         // LordHavoc: to avoid problems with aliasing (treating memory as two
 604         // different types - exactly what this is doing), these must be volatile
 605         // (or a union)
 606         volatile int *icolor;
 607         volatile float *fcolor;
 608         GLubyte *bcolor;
 609
 610         total = numverts * 4;
 611
 612         // shift float to have 8bit fraction at base of number
 613         fcolor = varray_buf_color4f;
 614         for (i = 0;i < total;)
 615         {
 616                 fcolor[i    ] += 32768.0f;
 617                 fcolor[i + 1] += 32768.0f;
 618                 fcolor[i + 2] += 32768.0f;
 619                 fcolor[i + 3] += 32768.0f;
 620                 i += 4;
 621         }
 622
 623         // then read as integer and kill float bits...
 624         icolor = (int *)varray_buf_color4f;
 625         bcolor = varray_buf_color4b;
 626         for (i = 0;i < total;)
 627         {
 628                 k = icolor[i    ] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i    ] = (GLubyte) k;
 629                 k = icolor[i + 1] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 1] = (GLubyte) k;
 630                 k = icolor[i + 2] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 2] = (GLubyte) k;
 631                 k = icolor[i + 3] & 0x7FFFFF;if (k > 255) k = 255;bcolor[i + 3] = (GLubyte) k;
 632                 i += 4;
 633         }
 634 }
 635
 636 /*
 637 // enlarges geometry buffers if they are too small
 638 void _R_Mesh_ResizeCheck(int numverts)
 639 {
 640         if (numverts > mesh_maxverts)
 641         {
 642                 BACKENDACTIVECHECK
 643                 GL_Backend_ResizeArrays(numverts + 100);
 644                 GL_Backend_ResetState();
 645         }
 646 }
 647 */
 648
 649 void GL_Backend_RenumberElements(int numelements, const int *in, int offset)
 650 {
 651         int i;
 652         for (i = 0;i < numelements;i++)
 653                 varray_buf_elements3i[i] = in[i] + offset;
 654 }
 655
 656 // gets geometry space for a mesh
 657 void R_Mesh_GetSpace(int numverts)
 658 {
 659         int i;
 660
 661         varray_offset = varray_offsetnext;
 662         if (varray_offset + numverts > mesh_maxverts)
 663                 varray_offset = 0;
 664         if (numverts > mesh_maxverts)
 665         {
 666                 BACKENDACTIVECHECK
 667                 GL_Backend_ResizeArrays(numverts + 100);
 668                 GL_Backend_ResetState();
 669                 varray_offset = 0;
 670         }
 671
 672         if (varray_offset == 0 && mesh_var)
 673         {
 674                 CHECKGLERROR
 675                 qglFlushVertexArrayRangeNV();
 676                 CHECKGLERROR
 677         }
 678
 679         // for debugging
 680         //if (!mesh_var)
 681         //      varray_offset = rand() % (mesh_maxverts - numverts);
 682
 683         varray_vertex3f = varray_buf_vertex3f + varray_offset * 3;
 684         varray_color4f = varray_buf_color4f + varray_offset * 4;
 685         varray_color4b = varray_buf_color4b + varray_offset * 4;
 686         for (i = 0;i < backendunits;i++)
 687         {
 688                 varray_texcoord3f[i] = varray_buf_texcoord3f[i] + varray_offset * 3;
 689                 varray_texcoord2f[i] = varray_buf_texcoord2f[i] + varray_offset * 2;
 690         }
 691
 692         varray_offsetnext = varray_offset + numverts;
 693 }
 694
 695 // renders the current mesh
 696 void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
 697 {
 698         int numelements;
 699         if (numtriangles == 0 || numverts == 0)
 700         {
 701                 Con_Printf("R_Mesh_Draw(%d, %d, %08p);\n", numverts, numtriangles, elements);
 702                 return;
 703         }
 704         numelements = numtriangles * 3;
 705         if (mesh_maxelements < numelements)
 706         {
 707                 mesh_maxelements = numelements;
 708                 GL_Backend_AllocElementsArray();
 709         }
 710         GL_Backend_RenumberElements(numelements, elements, varray_offset);
 711         c_meshs++;
 712         c_meshelements += numelements;
 713         if (gl_state.colorarray && !gl_mesh_floatcolors.integer)
 714                 GL_ConvertColorsFloatToByte(numverts);
 715         if (r_render.integer)
 716         {
 717                 if (gl_supportslockarrays && gl_lockarrays.integer)
 718                 {
 719                         qglLockArraysEXT(varray_offset, numverts);
 720                         CHECKGLERROR
 721                         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
 722                         {
 723                                 qglDrawRangeElements(GL_TRIANGLES, varray_offset, varray_offset + numverts, numelements, GL_UNSIGNED_INT, (const GLuint *) varray_buf_elements3i);
 724                                 CHECKGLERROR
 725                         }
 726                         else
 727                         {
 728                                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) varray_buf_elements3i);
 729                                 CHECKGLERROR
 730                         }
 731                         qglUnlockArraysEXT();
 732                         CHECKGLERROR
 733                 }
 734                 else
 735                 {
 736                         qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) varray_buf_elements3i);
 737                         CHECKGLERROR
 738                 }
 739         }
 740 }
 741
 742 // restores backend state, used when done with 3D rendering
 743 void R_Mesh_Finish(void)
 744 {
 745         int i;
 746         BACKENDACTIVECHECK
 747         if (mesh_var)
 748         {
 749                 CHECKGLERROR
 750                 qglFlushVertexArrayRangeNV();
 751                 CHECKGLERROR
 752         }
 753         varray_offset = 0;
 754
 755         for (i = backendunits - 1;i >= 0;i--)
 756         {
 757                 if (qglActiveTexture)
 758                         qglActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 759                 if (qglClientActiveTexture)
 760                         qglClientActiveTexture(GL_TEXTURE0_ARB + i);CHECKGLERROR
 761                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 762                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 763                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 764                 if (gl_texture3d)
 765                 {
 766                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 767                 }
 768                 if (gl_texturecubemap)
 769                 {
 770                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 771                 }
 772                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 773                 if (gl_combine.integer)
 774                 {
 775                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 776                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 777                 }
 778         }
 779         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 780         qglDisableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 781
 782         qglDisable(GL_BLEND);CHECKGLERROR
 783         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 784         qglDepthMask(GL_TRUE);CHECKGLERROR
 785         qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CHECKGLERROR
 786 }
 787
 788 void R_Mesh_Matrix(const matrix4x4_t *matrix)
 789 {
 790         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
 791         {
 792                 backend_modelmatrix = *matrix;
 793                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewmatrix, matrix);
 794                 Matrix4x4_Transpose(&backend_glmodelviewmatrix, &backend_modelviewmatrix);
 795                 qglLoadMatrixf(&backend_glmodelviewmatrix.m[0][0]);
 796         }
 797 }
 798
 799 // sets up the requested state
 800 void R_Mesh_MainState(const rmeshstate_t *m)
 801 {
 802         BACKENDACTIVECHECK
 803
 804         if (gl_state.blendfunc1 != m->blendfunc1 || gl_state.blendfunc2 != m->blendfunc2)
 805         {
 806                 qglBlendFunc(gl_state.blendfunc1 = m->blendfunc1, gl_state.blendfunc2 = m->blendfunc2);CHECKGLERROR
 807                 if (gl_state.blendfunc2 == GL_ZERO)
 808                 {
 809                         if (gl_state.blendfunc1 == GL_ONE)
 810                         {
 811                                 if (gl_state.blend)
 812                                 {
 813                                         gl_state.blend = 0;
 814                                         qglDisable(GL_BLEND);CHECKGLERROR
 815                                 }
 816                         }
 817                         else
 818                         {
 819                                 if (!gl_state.blend)
 820                                 {
 821                                         gl_state.blend = 1;
 822                                         qglEnable(GL_BLEND);CHECKGLERROR
 823                                 }
 824                         }
 825                 }
 826                 else
 827                 {
 828                         if (!gl_state.blend)
 829                         {
 830                                 gl_state.blend = 1;
 831                                 qglEnable(GL_BLEND);CHECKGLERROR
 832                         }
 833                 }
 834         }
 835         if (gl_state.depthdisable != m->depthdisable)
 836         {
 837                 gl_state.depthdisable = m->depthdisable;
 838                 if (gl_state.depthdisable)
 839                         qglDisable(GL_DEPTH_TEST);
 840                 else
 841                         qglEnable(GL_DEPTH_TEST);
 842         }
 843         if (gl_state.depthmask != (m->blendfunc2 == GL_ZERO || m->depthwrite))
 844         {
 845                 qglDepthMask(gl_state.depthmask = (m->blendfunc2 == GL_ZERO || m->depthwrite));CHECKGLERROR
 846         }
 847 }
 848
 849 void R_Mesh_TextureState(const rmeshstate_t *m)
 850 {
 851         int i, combinergb, combinealpha;
 852         float scale;
 853         gltextureunit_t *unit;
 854
 855         BACKENDACTIVECHECK
 856
 857         if (gl_backend_rebindtextures)
 858         {
 859                 gl_backend_rebindtextures = false;
 860                 GL_SetupTextureState();
 861         }
 862
 863         for (i = 0;i < backendunits;i++)
 864         {
 865                 unit = gl_state.units + i;
 866                 if (unit->t1d != m->tex1d[i] || unit->t2d != m->tex[i] || unit->t3d != m->tex3d[i] || unit->tcubemap != m->texcubemap[i])
 867                 {
 868                         if (m->tex3d[i] || m->texcubemap[i])
 869                         {
 870                                 if (!unit->arrayis3d)
 871                                 {
 872                                         unit->arrayis3d = true;
 873                                         if (gl_state.clientunit != i)
 874                                         {
 875                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 876                                         }
 877                                         qglTexCoordPointer(3, GL_FLOAT, sizeof(float[3]), varray_buf_texcoord3f[i]);
 878                                 }
 879                                 if (!unit->arrayenabled)
 880                                 {
 881                                         unit->arrayenabled = true;
 882                                         if (gl_state.clientunit != i)
 883                                         {
 884                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 885                                         }
 886                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 887                                 }
 888                         }
 889                         else if (m->tex1d[i] || m->tex[i])
 890                         {
 891                                 if (unit->arrayis3d)
 892                                 {
 893                                         unit->arrayis3d = false;
 894                                         if (gl_state.clientunit != i)
 895                                         {
 896                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 897                                         }
 898                                         qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), varray_buf_texcoord2f[i]);
 899                                 }
 900                                 if (!unit->arrayenabled)
 901                                 {
 902                                         unit->arrayenabled = true;
 903                                         if (gl_state.clientunit != i)
 904                                         {
 905                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 906                                         }
 907                                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 908                                 }
 909                         }
 910                         else
 911                         {
 912                                 if (unit->arrayenabled)
 913                                 {
 914                                         unit->arrayenabled = false;
 915                                         if (gl_state.clientunit != i)
 916                                         {
 917                                                 qglClientActiveTexture(GL_TEXTURE0_ARB + (gl_state.clientunit = i));CHECKGLERROR
 918                                         }
 919                                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 920                                 }
 921                         }
 922                         if (unit->t1d != m->tex1d[i])
 923                         {
 924                                 if (gl_state.unit != i)
 925                                 {
 926                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 927                                 }
 928                                 if (m->tex1d[i])
 929                                 {
 930                                         if (unit->t1d == 0)
 931                                                 qglEnable(GL_TEXTURE_1D);CHECKGLERROR
 932                                 }
 933                                 else
 934                                 {
 935                                         if (unit->t1d)
 936                                                 qglDisable(GL_TEXTURE_1D);CHECKGLERROR
 937                                 }
 938                                 qglBindTexture(GL_TEXTURE_1D, (unit->t1d = m->tex1d[i]));CHECKGLERROR
 939                         }
 940                         if (unit->t2d != m->tex[i])
 941                         {
 942                                 if (gl_state.unit != i)
 943                                 {
 944                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 945                                 }
 946                                 if (m->tex[i])
 947                                 {
 948                                         if (unit->t2d == 0)
 949                                                 qglEnable(GL_TEXTURE_2D);CHECKGLERROR
 950                                 }
 951                                 else
 952                                 {
 953                                         if (unit->t2d)
 954                                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 955                                 }
 956                                 qglBindTexture(GL_TEXTURE_2D, (unit->t2d = m->tex[i]));CHECKGLERROR
 957                         }
 958                         if (unit->t3d != m->tex3d[i])
 959                         {
 960                                 if (gl_state.unit != i)
 961                                 {
 962                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 963                                 }
 964                                 if (m->tex3d[i])
 965                                 {
 966                                         if (unit->t3d == 0)
 967                                                 qglEnable(GL_TEXTURE_3D);CHECKGLERROR
 968                                 }
 969                                 else
 970                                 {
 971                                         if (unit->t3d)
 972                                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 973                                 }
 974                                 qglBindTexture(GL_TEXTURE_3D, (unit->t3d = m->tex3d[i]));CHECKGLERROR
 975                         }
 976                         if (unit->tcubemap != m->texcubemap[i])
 977                         {
 978                                 if (gl_state.unit != i)
 979                                 {
 980                                         qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
 981                                 }
 982                                 if (m->texcubemap[i])
 983                                 {
 984                                         if (unit->tcubemap == 0)
 985                                                 qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 986                                 }
 987                                 else
 988                                 {
 989                                         if (unit->tcubemap)
 990                                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 991                                 }
 992                                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
 993                         }
 994                 }
 995                 combinergb = m->texcombinergb[i];
 996                 if (!combinergb)
 997                         combinergb = GL_MODULATE;
 998                 if (unit->combinergb != combinergb)
 999                 {
1000                         if (gl_state.unit != i)
1001                         {
1002                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
1003                         }
1004                         unit->combinergb = combinergb;
1005                         if (gl_combine.integer)
1006                         {
1007                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
1008                         }
1009                         else
1010                         {
1011                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
1012                         }
1013                 }
1014                 combinealpha = m->texcombinealpha[i];
1015                 if (!combinealpha)
1016                         combinealpha = GL_MODULATE;
1017                 if (unit->combinealpha != combinealpha)
1018                 {
1019                         if (gl_state.unit != i)
1020                         {
1021                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
1022                         }
1023                         unit->combinealpha = combinealpha;
1024                         if (gl_combine.integer)
1025                         {
1026                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1027                         }
1028                 }
1029                 scale = max(m->texrgbscale[i], 1);
1030                 if (gl_state.units[i].rgbscale != scale)
1031                 {
1032                         if (gl_state.unit != i)
1033                         {
1034                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
1035                         }
1036                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.units[i].rgbscale = scale));CHECKGLERROR
1037                 }
1038                 scale = max(m->texalphascale[i], 1);
1039                 if (gl_state.units[i].alphascale != scale)
1040                 {
1041                         if (gl_state.unit != i)
1042                         {
1043                                 qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
1044                         }
1045                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (gl_state.units[i].alphascale = scale));CHECKGLERROR
1046                 }
1047         }
1048 }
1049
1050 void R_Mesh_State(const rmeshstate_t *m)
1051 {
1052         R_Mesh_MainState(m);
1053         R_Mesh_TextureState(m);
1054 }
1055
1056 /*
1057 ==============================================================================
1058
1059                                                 SCREEN SHOTS
1060
1061 ==============================================================================
1062 */
1063
1064 qboolean SCR_ScreenShot(char *filename, int x, int y, int width, int height, qboolean jpeg)
1065 {
1066         qboolean ret;
1067         int i, j;
1068         qbyte *buffer;
1069
1070         if (!r_render.integer)
1071                 return false;
1072
1073         buffer = Mem_Alloc(tempmempool, width*height*3);
1074         qglReadPixels (x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE, buffer);
1075         CHECKGLERROR
1076
1077         // LordHavoc: compensate for v_overbrightbits when using hardware gamma
1078         if (v_hwgamma.integer)
1079         {
1080                 for (i = 0;i < width * height * 3;i++)
1081                 {
1082                         j = buffer[i] << v_overbrightbits.integer;
1083                         buffer[i] = (qbyte) (bound(0, j, 255));
1084                 }
1085         }
1086
1087         if (jpeg)
1088                 ret = JPEG_SaveImage_preflipped (filename, width, height, buffer);
1089         else
1090                 ret = Image_WriteTGARGB_preflipped (filename, width, height, buffer);
1091
1092         Mem_Free(buffer);
1093         return ret;
1094 }
1095
1096 //=============================================================================
1097
1098 void R_ClearScreen(void)
1099 {
1100         if (r_render.integer)
1101         {
1102                 // clear to black
1103                 qglClearColor(0,0,0,0);CHECKGLERROR
1104                 qglClearDepth(1);CHECKGLERROR
1105                 if (gl_stencil)
1106                 {
1107                         // LordHavoc: we use a stencil centered around 128 instead of 0,
1108                         // to avoid clamping interfering with strange shadow volume
1109                         // drawing orders
1110                         qglClearStencil(128);CHECKGLERROR
1111                 }
1112                 // clear the screen
1113                 qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));CHECKGLERROR
1114                 // set dithering mode
1115                 if (gl_dither.integer)
1116                 {
1117                         qglEnable(GL_DITHER);CHECKGLERROR
1118                 }
1119                 else
1120                 {
1121                         qglDisable(GL_DITHER);CHECKGLERROR
1122                 }
1123         }
1124 }
1125
1126 /*
1127 ==================
1128 SCR_UpdateScreen
1129
1130 This is called every frame, and can also be called explicitly to flush
1131 text to the screen.
1132 ==================
1133 */
1134 void SCR_UpdateScreen (void)
1135 {
1136         if (gl_delayfinish.integer)
1137         {
1138                 VID_Finish ();
1139
1140                 R_TimeReport("finish");
1141         }
1142
1143         if (r_textureunits.integer > gl_textureunits)
1144                 Cvar_SetValueQuick(&r_textureunits, gl_textureunits);
1145         if (r_textureunits.integer < 1)
1146                 Cvar_SetValueQuick(&r_textureunits, 1);
1147
1148         if (gl_combine.integer && (!gl_combine_extension || r_textureunits.integer < 2))
1149                 Cvar_SetValueQuick(&gl_combine, 0);
1150
1151         // lighting scale
1152         r_colorscale = 1.0f / (float) (1 << v_overbrightbits.integer);
1153
1154         // lightmaps only
1155         r_lightmapscalebit = v_overbrightbits.integer;
1156         if (gl_combine.integer && r_textureunits.integer > 1)
1157                 r_lightmapscalebit += 2;
1158
1159         R_TimeReport("setup");
1160
1161         R_ClearScreen();
1162
1163         R_TimeReport("clear");
1164
1165         if (scr_conlines < vid.conheight && cls.signon == SIGNONS)
1166                 R_RenderView();
1167
1168         // draw 2D stuff
1169         R_DrawQueue();
1170
1171         if (gl_delayfinish.integer)
1172         {
1173                 // tell driver to commit it's partially full geometry queue to the rendering queue
1174                 // (this doesn't wait for the commands themselves to complete)
1175                 qglFlush();
1176         }
1177         else
1178         {
1179                 VID_Finish ();
1180
1181                 R_TimeReport("finish");
1182         }
1183 }
1184
1185 // utility functions
1186
1187 void R_Mesh_CopyVertex3f(const float *vertex3f, int numverts)
1188 {
1189         if (mesh_var)
1190         {
1191                 float *out = varray_vertex3f;
1192                 while (--numverts)
1193                 {
1194                         *out++ = *vertex3f++;
1195                         *out++ = *vertex3f++;
1196                         *out++ = *vertex3f++;
1197                 }
1198         }
1199         else
1200                 memcpy(varray_vertex3f, vertex3f, numverts * sizeof(float[3]));
1201 }
1202
1203 void R_Mesh_CopyTexCoord2f(int tmu, const float *texcoord2f, int numverts)
1204 {
1205         if (mesh_var)
1206         {
1207                 float *out = varray_texcoord2f[tmu];
1208                 while (--numverts)
1209                 {
1210                         *out++ = *texcoord2f++;
1211                         *out++ = *texcoord2f++;
1212                 }
1213         }
1214         else
1215                 memcpy(varray_texcoord2f[tmu], texcoord2f, numverts * sizeof(float[2]));
1216 }
1217
1218 void R_Mesh_CopyColor4f(const float *color4f, int numverts)
1219 {
1220         if (mesh_var)
1221         {
1222                 float *out = varray_color4f;
1223                 while (--numverts)
1224                 {
1225                         *out++ = *color4f++;
1226                         *out++ = *color4f++;
1227                         *out++ = *color4f++;
1228                         *out++ = *color4f++;
1229                 }
1230         }
1231         else
1232                 memcpy(varray_color4f, color4f, numverts * sizeof(float[4]));
1233 }
1234
1235