implemented scissor rect clipping of lights in realtime lighting mode

[xonotic/darkplaces.git] / gl_backend.c

diff --git a/gl_backend.c b/gl_backend.c
index 65b2c4a1c8e1769ce02445f1058b33c7fbc63730..8f681d232181153180063bee1cb3814fbf55956d 100644 (file)
--- a/gl_backend.c
+++ b/gl_backend.c
@@ -1,5 +1,6 @@
 
 #include "quakedef.h"
+#include "image.h"
 
 cvar_t gl_mesh_maxverts = {0, "gl_mesh_maxverts", "1024"};
 cvar_t gl_mesh_floatcolors = {0, "gl_mesh_floatcolors", "1"};
@@ -79,11 +80,29 @@ static matrix4x4_t backend_viewmatrix;
 static matrix4x4_t backend_modelmatrix;
 static matrix4x4_t backend_modelviewmatrix;
 static matrix4x4_t backend_glmodelviewmatrix;
+static matrix4x4_t backend_projectmatrix;
 
 static int backendunits, backendactive;
 static qbyte *varray_bcolor;
 static mempool_t *gl_backend_mempool;
 
+/*
+note: here's strip order for a terrain row:
+0--1--2--3--4
+|\ |\ |\ |\ |
+| \| \| \| \|
+A--B--C--D--E
+
+A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
+
+*elements++ = i + row;
+*elements++ = i;
+*elements++ = i + row + 1;
+*elements++ = i;
+*elements++ = i + 1;
+*elements++ = i + row + 1;
+*/
+
 int polygonelements[768];
 
 void GL_Backend_AllocArrays(void)
@@ -271,6 +290,22 @@ void GL_SetupView_Mode_PerspectiveInfiniteFarClip (double fovx, double fovy, dou
        qglLoadMatrixd(m);
        qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
        GL_SetupView_Orientation_Identity();
+       backend_projectmatrix.m[0][0] = m[0];
+       backend_projectmatrix.m[1][0] = m[1];
+       backend_projectmatrix.m[2][0] = m[2];
+       backend_projectmatrix.m[3][0] = m[3];
+       backend_projectmatrix.m[0][1] = m[4];
+       backend_projectmatrix.m[1][1] = m[5];
+       backend_projectmatrix.m[2][1] = m[6];
+       backend_projectmatrix.m[3][1] = m[7];
+       backend_projectmatrix.m[0][2] = m[8];
+       backend_projectmatrix.m[1][2] = m[9];
+       backend_projectmatrix.m[2][2] = m[10];
+       backend_projectmatrix.m[3][2] = m[11];
+       backend_projectmatrix.m[0][3] = m[12];
+       backend_projectmatrix.m[1][3] = m[13];
+       backend_projectmatrix.m[2][3] = m[14];
+       backend_projectmatrix.m[3][3] = m[15];
 }
 
 void GL_SetupView_Mode_Ortho (double x1, double y1, double x2, double y2, double zNear, double zFar)
@@ -290,7 +325,7 @@ typedef struct gltextureunit_s
 {
        unsigned int t1d, t2d, t3d, tcubemap;
        unsigned int arrayenabled;
-       float rgbscale;
+       float rgbscale, alphascale;
        int combinergb, combinealpha;
        // FIXME: add more combine stuff
 }
@@ -326,6 +361,7 @@ void GL_SetupTextureState(void)
                unit->t3d = 0;
                unit->tcubemap = 0;
                unit->rgbscale = 1;
+               unit->alphascale = 1;
                unit->combinergb = GL_MODULATE;
                unit->combinealpha = GL_MODULATE;
                unit->arrayenabled = false;
@@ -428,6 +464,18 @@ void GL_Color(float cr, float cg, float cb, float ca)
        qglColor4f(cr, cg, cb, ca);
 }
 
+void GL_TransformToScreen(const vec4_t in, vec4_t out)
+{
+       vec4_t temp;
+       float iw;
+       Matrix4x4_Transform4 (&backend_viewmatrix, in, temp);
+       Matrix4x4_Transform4 (&backend_projectmatrix, temp, out);
+       iw = 1.0f / out[3];
+       out[0] = r_refdef.x + (out[0] * iw + 1.0f) * r_refdef.width * 0.5f;
+       out[1] = r_refdef.y + (out[1] * iw + 1.0f) * r_refdef.height * 0.5f;
+       out[2] = out[2] * iw;
+}
+
 // called at beginning of frame
 void R_Mesh_Start(void)
 {
@@ -561,6 +609,7 @@ void R_Mesh_Finish(void)
                if (gl_combine.integer)
                {
                        qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
+                       qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
                }
        }
        qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
@@ -636,7 +685,7 @@ void R_Mesh_MainState(const rmeshstate_t *m)
 void R_Mesh_TextureState(const rmeshstate_t *m)
 {
        int i, combinergb, combinealpha;
-       float rgbscale;
+       float scale;
        gltextureunit_t *unit;
 
        BACKENDACTIVECHECK
@@ -763,14 +812,23 @@ void R_Mesh_TextureState(const rmeshstate_t *m)
                                qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, (unit->tcubemap = m->texcubemap[i]));CHECKGLERROR
                        }
                }
-               rgbscale = max(m->texrgbscale[i], 1);
-               if (gl_state.units[i].rgbscale != rgbscale)
+               scale = max(m->texrgbscale[i], 1);
+               if (gl_state.units[i].rgbscale != scale)
                {
                        if (gl_state.unit != i)
                        {
                                qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
                        }
-                       qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.units[i].rgbscale = rgbscale));CHECKGLERROR
+                       qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (gl_state.units[i].rgbscale = scale));CHECKGLERROR
+               }
+               scale = max(m->texalphascale[i], 1);
+               if (gl_state.units[i].alphascale != scale)
+               {
+                       if (gl_state.unit != i)
+                       {
+                               qglActiveTexture(GL_TEXTURE0_ARB + (gl_state.unit = i));CHECKGLERROR
+                       }
+                       qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (gl_state.units[i].alphascale = scale));CHECKGLERROR
                }
        }
 }
@@ -821,8 +879,13 @@ void R_ClearScreen(void)
        {
                // clear to black
                qglClearColor(0,0,0,0);CHECKGLERROR
+               qglClearDepth(1);CHECKGLERROR
+               if (gl_stencil)
+               {
+                       qglClearStencil(0);CHECKGLERROR
+               }
                // clear the screen
-               qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);CHECKGLERROR
+               qglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | (gl_stencil ? GL_STENCIL_BUFFER_BIT : 0));CHECKGLERROR
                // set dithering mode
                if (gl_dither.integer)
                {