optimized surface rendering to surface->groupmesh->data_* array pointers directly...

[xonotic/darkplaces.git] / r_shadow.c

diff --git a/r_shadow.c b/r_shadow.c
index 9575f9c785c8ed8d23a7ff5146ad1661325efdb2..f5cbf9fa2b90655b3b7f25eacb23a50c7afbabdc 100644 (file)
--- a/r_shadow.c
+++ b/r_shadow.c
@@ -1552,7 +1552,7 @@ static void R_Shadow_GenTexCoords_Specular_NormalCubeMap(float *out3f, int numve
        }
 }
 
-void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements, const float *vertex3f, const float *svector3f, const float *tvector3f, const float *normal3f, const float *texcoord2f, const float *relativelightorigin, const float *relativeeyeorigin, const float *lightcolor, const matrix4x4_t *matrix_modeltolight, const matrix4x4_t *matrix_modeltoattenuationxyz, const matrix4x4_t *matrix_modeltoattenuationz, rtexture_t *basetexture, rtexture_t *bumptexture, rtexture_t *glosstexture, rtexture_t *lightcubemap, vec_t ambientscale, vec_t diffusescale, vec_t specularscale)
+void R_Shadow_RenderLighting(int firstvertex, int numvertices, int numtriangles, const int *elements, const float *vertex3f, const float *svector3f, const float *tvector3f, const float *normal3f, const float *texcoord2f, const float *relativelightorigin, const float *relativeeyeorigin, const float *lightcolor, const matrix4x4_t *matrix_modeltolight, const matrix4x4_t *matrix_modeltoattenuationxyz, const matrix4x4_t *matrix_modeltoattenuationz, rtexture_t *basetexture, rtexture_t *bumptexture, rtexture_t *glosstexture, rtexture_t *lightcubemap, vec_t ambientscale, vec_t diffusescale, vec_t specularscale)
 {
        int renders;
        float color[3], color2[3], colorscale;
@@ -1641,8 +1641,8 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                        qglUniform1fARB(qglGetUniformLocationARB(prog, "OffsetMapping_Bias"), r_shadow_glsl_offsetmapping_bias.value);CHECKGLERROR
                }
                CHECKGLERROR
-               GL_LockArrays(0, numverts);
-               R_Mesh_Draw(0, numverts, numtriangles, elements);
+               GL_LockArrays(firstvertex, numvertices);
+               R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                c_rt_lightmeshes++;
                c_rt_lighttris += numtriangles;
                GL_LockArrays(0, 0);
@@ -1680,7 +1680,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[0] = *matrix_modeltoattenuationxyz;
 #else
                                m.pointer_texcoord3f[0] = varray_texcoord3f[0];
-                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[0], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[0] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                m.tex[1] = R_GetTexture(basetexture);
                                m.pointer_texcoord[1] = texcoord2f;
@@ -1690,7 +1690,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[2] = *matrix_modeltolight;
 #else
                                m.pointer_texcoord3f[2] = varray_texcoord3f[2];
-                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[2], numverts, vertex3f, matrix_modeltolight);
+                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[2] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltolight);
 #endif
                                GL_BlendFunc(GL_ONE, GL_ONE);
                        }
@@ -1705,7 +1705,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[0] = *matrix_modeltoattenuationxyz;
 #else
                                m.pointer_texcoord3f[0] = varray_texcoord3f[0];
-                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[0], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[0] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                m.tex[1] = R_GetTexture(basetexture);
                                m.pointer_texcoord[1] = texcoord2f;
@@ -1722,7 +1722,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[0] = *matrix_modeltoattenuationxyz;
 #else
                                m.pointer_texcoord[0] = varray_texcoord2f[0];
-                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[0], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[0] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                m.tex[1] = R_GetTexture(r_shadow_attenuation2dtexture);
 #ifdef USETEXMATRIX
@@ -1730,7 +1730,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[1] = *matrix_modeltoattenuationz;
 #else
                                m.pointer_texcoord[1] = varray_texcoord2f[1];
-                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1], numverts, vertex3f, matrix_modeltoattenuationz);
+                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationz);
 #endif
                                m.tex[2] = R_GetTexture(basetexture);
                                m.pointer_texcoord[2] = texcoord2f;
@@ -1742,7 +1742,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texmatrix[3] = *matrix_modeltolight;
 #else
                                        m.pointer_texcoord3f[3] = varray_texcoord3f[3];
-                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[3], numverts, vertex3f, matrix_modeltolight);
+                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[3] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltolight);
 #endif
                                }
                                GL_BlendFunc(GL_ONE, GL_ONE);
@@ -1758,7 +1758,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[0] = *matrix_modeltoattenuationxyz;
 #else
                                m.pointer_texcoord[0] = varray_texcoord2f[0];
-                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[0], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[0] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                m.tex[1] = R_GetTexture(r_shadow_attenuation2dtexture);
 #ifdef USETEXMATRIX
@@ -1766,7 +1766,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[1] = *matrix_modeltoattenuationz;
 #else
                                m.pointer_texcoord[1] = varray_texcoord2f[1];
-                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1], numverts, vertex3f, matrix_modeltoattenuationz);
+                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationz);
 #endif
                                m.tex[2] = R_GetTexture(basetexture);
                                m.pointer_texcoord[2] = texcoord2f;
@@ -1783,7 +1783,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[0] = *matrix_modeltoattenuationxyz;
 #else
                                m.pointer_texcoord[0] = varray_texcoord2f[0];
-                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[0], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[0] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                m.tex[1] = R_GetTexture(r_shadow_attenuation2dtexture);
 #ifdef USETEXMATRIX
@@ -1791,13 +1791,13 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[1] = *matrix_modeltoattenuationz;
 #else
                                m.pointer_texcoord[1] = varray_texcoord2f[1];
-                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1], numverts, vertex3f, matrix_modeltoattenuationz);
+                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationz);
 #endif
                                R_Mesh_State(&m);
                                GL_ColorMask(0,0,0,1);
                                GL_BlendFunc(GL_ONE, GL_ZERO);
-                               GL_LockArrays(0, numverts);
-                               R_Mesh_Draw(0, numverts, numtriangles, elements);
+                               GL_LockArrays(firstvertex, numvertices);
+                               R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                GL_LockArrays(0, 0);
                                c_rt_lightmeshes++;
                                c_rt_lighttris += numtriangles;
@@ -1814,7 +1814,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texmatrix[1] = *matrix_modeltolight;
 #else
                                        m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1], numverts, vertex3f, matrix_modeltolight);
+                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltolight);
 #endif
                                }
                                GL_BlendFunc(GL_DST_ALPHA, GL_ONE);
@@ -1823,11 +1823,11 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                        R_Mesh_State(&m);
                        GL_ColorMask(r_refdef.colormask[0], r_refdef.colormask[1], r_refdef.colormask[2], 0);
                        VectorScale(lightcolor, colorscale, color2);
-                       GL_LockArrays(0, numverts);
+                       GL_LockArrays(firstvertex, numvertices);
                        for (renders = 0;renders < 64 && (color2[0] > 0 || color2[1] > 0 || color2[2] > 0);renders++, color2[0]--, color2[1]--, color2[2]--)
                        {
                                GL_Color(bound(0, color2[0], 1), bound(0, color2[1], 1), bound(0, color2[2], 1), 1);
-                               R_Mesh_Draw(0, numverts, numtriangles, elements);
+                               R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                c_rt_lightmeshes++;
                                c_rt_lighttris += numtriangles;
                        }
@@ -1855,20 +1855,20 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texcubemap[1] = R_GetTexture(r_shadow_normalcubetexture);
                                m.texcombinergb[1] = GL_DOT3_RGBA_ARB;
                                m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                               R_Shadow_GenTexCoords_Diffuse_NormalCubeMap(varray_texcoord3f[1], numverts, vertex3f, svector3f, tvector3f, normal3f, relativelightorigin);
+                               R_Shadow_GenTexCoords_Diffuse_NormalCubeMap(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, svector3f + 3 * firstvertex, tvector3f + 3 * firstvertex, normal3f + 3 * firstvertex, relativelightorigin);
                                m.tex3d[2] = R_GetTexture(r_shadow_attenuation3dtexture);
 #ifdef USETEXMATRIX
                                m.pointer_texcoord3f[2] = vertex3f;
                                m.texmatrix[2] = *matrix_modeltoattenuationxyz;
 #else
                                m.pointer_texcoord3f[2] = varray_texcoord3f[2];
-                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[2], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[2] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                R_Mesh_State(&m);
                                GL_ColorMask(0,0,0,1);
                                GL_BlendFunc(GL_ONE, GL_ZERO);
-                               GL_LockArrays(0, numverts);
-                               R_Mesh_Draw(0, numverts, numtriangles, elements);
+                               GL_LockArrays(firstvertex, numvertices);
+                               R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                GL_LockArrays(0, 0);
                                c_rt_lightmeshes++;
                                c_rt_lighttris += numtriangles;
@@ -1885,7 +1885,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texmatrix[1] = *matrix_modeltolight;
 #else
                                        m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1], numverts, vertex3f, matrix_modeltolight);
+                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltolight);
 #endif
                                }
                                GL_BlendFunc(GL_DST_ALPHA, GL_ONE);
@@ -1901,13 +1901,13 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[0] = *matrix_modeltoattenuationxyz;
 #else
                                m.pointer_texcoord3f[0] = varray_texcoord3f[0];
-                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[0], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[0] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                R_Mesh_State(&m);
                                GL_ColorMask(0,0,0,1);
                                GL_BlendFunc(GL_ONE, GL_ZERO);
-                               GL_LockArrays(0, numverts);
-                               R_Mesh_Draw(0, numverts, numtriangles, elements);
+                               GL_LockArrays(firstvertex, numvertices);
+                               R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                GL_LockArrays(0, 0);
                                c_rt_lightmeshes++;
                                c_rt_lighttris += numtriangles;
@@ -1920,11 +1920,11 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texcubemap[1] = R_GetTexture(r_shadow_normalcubetexture);
                                m.texcombinergb[1] = GL_DOT3_RGBA_ARB;
                                m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                               R_Shadow_GenTexCoords_Diffuse_NormalCubeMap(varray_texcoord3f[1], numverts, vertex3f, svector3f, tvector3f, normal3f, relativelightorigin);
+                               R_Shadow_GenTexCoords_Diffuse_NormalCubeMap(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, svector3f + 3 * firstvertex, tvector3f + 3 * firstvertex, normal3f + 3 * firstvertex, relativelightorigin);
                                R_Mesh_State(&m);
                                GL_BlendFunc(GL_DST_ALPHA, GL_ZERO);
-                               GL_LockArrays(0, numverts);
-                               R_Mesh_Draw(0, numverts, numtriangles, elements);
+                               GL_LockArrays(firstvertex, numvertices);
+                               R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                GL_LockArrays(0, 0);
                                c_rt_lightmeshes++;
                                c_rt_lighttris += numtriangles;
@@ -1941,7 +1941,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texmatrix[1] = *matrix_modeltolight;
 #else
                                        m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1], numverts, vertex3f, matrix_modeltolight);
+                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltolight);
 #endif
                                }
                                GL_BlendFunc(GL_DST_ALPHA, GL_ONE);
@@ -1957,12 +1957,12 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texcubemap[1] = R_GetTexture(r_shadow_normalcubetexture);
                                m.texcombinergb[1] = GL_DOT3_RGBA_ARB;
                                m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                               R_Shadow_GenTexCoords_Diffuse_NormalCubeMap(varray_texcoord3f[1], numverts, vertex3f, svector3f, tvector3f, normal3f, relativelightorigin);
+                               R_Shadow_GenTexCoords_Diffuse_NormalCubeMap(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, svector3f + 3 * firstvertex, tvector3f + 3 * firstvertex, normal3f + 3 * firstvertex, relativelightorigin);
                                R_Mesh_State(&m);
                                GL_ColorMask(0,0,0,1);
                                GL_BlendFunc(GL_ONE, GL_ZERO);
-                               GL_LockArrays(0, numverts);
-                               R_Mesh_Draw(0, numverts, numtriangles, elements);
+                               GL_LockArrays(firstvertex, numvertices);
+                               R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                GL_LockArrays(0, 0);
                                c_rt_lightmeshes++;
                                c_rt_lighttris += numtriangles;
@@ -1977,7 +1977,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[1] = *matrix_modeltoattenuationxyz;
 #else
                                m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                GL_BlendFunc(GL_DST_ALPHA, GL_ONE);
                        }
@@ -1992,14 +1992,14 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texcubemap[1] = R_GetTexture(r_shadow_normalcubetexture);
                                m.texcombinergb[1] = GL_DOT3_RGBA_ARB;
                                m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                               R_Shadow_GenTexCoords_Diffuse_NormalCubeMap(varray_texcoord3f[1], numverts, vertex3f, svector3f, tvector3f, normal3f, relativelightorigin);
+                               R_Shadow_GenTexCoords_Diffuse_NormalCubeMap(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, svector3f + 3 * firstvertex, tvector3f + 3 * firstvertex, normal3f + 3 * firstvertex, relativelightorigin);
                                m.tex[2] = R_GetTexture(r_shadow_attenuation2dtexture);
 #ifdef USETEXMATRIX
                                m.pointer_texcoord3f[2] = vertex3f;
                                m.texmatrix[2] = *matrix_modeltoattenuationxyz;
 #else
                                m.pointer_texcoord[2] = varray_texcoord2f[2];
-                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[2], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[2] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                m.tex[3] = R_GetTexture(r_shadow_attenuation2dtexture);
 #ifdef USETEXMATRIX
@@ -2007,13 +2007,13 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[3] = *matrix_modeltoattenuationz;
 #else
                                m.pointer_texcoord[3] = varray_texcoord2f[3];
-                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[3], numverts, vertex3f, matrix_modeltoattenuationz);
+                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[3] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationz);
 #endif
                                R_Mesh_State(&m);
                                GL_ColorMask(0,0,0,1);
                                GL_BlendFunc(GL_ONE, GL_ZERO);
-                               GL_LockArrays(0, numverts);
-                               R_Mesh_Draw(0, numverts, numtriangles, elements);
+                               GL_LockArrays(firstvertex, numvertices);
+                               R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                GL_LockArrays(0, 0);
                                c_rt_lightmeshes++;
                                c_rt_lighttris += numtriangles;
@@ -2030,7 +2030,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texmatrix[1] = *matrix_modeltolight;
 #else
                                        m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1], numverts, vertex3f, matrix_modeltolight);
+                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltolight);
 #endif
                                }
                                GL_BlendFunc(GL_DST_ALPHA, GL_ONE);
@@ -2046,7 +2046,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[0] = *matrix_modeltoattenuationxyz;
 #else
                                m.pointer_texcoord[0] = varray_texcoord2f[0];
-                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[0], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[0] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                m.tex[1] = R_GetTexture(r_shadow_attenuation2dtexture);
 #ifdef USETEXMATRIX
@@ -2054,13 +2054,13 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[1] = *matrix_modeltoattenuationz;
 #else
                                m.pointer_texcoord[1] = varray_texcoord2f[1];
-                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1], numverts, vertex3f, matrix_modeltoattenuationz);
+                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationz);
 #endif
                                R_Mesh_State(&m);
                                GL_ColorMask(0,0,0,1);
                                GL_BlendFunc(GL_ONE, GL_ZERO);
-                               GL_LockArrays(0, numverts);
-                               R_Mesh_Draw(0, numverts, numtriangles, elements);
+                               GL_LockArrays(firstvertex, numvertices);
+                               R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                GL_LockArrays(0, 0);
                                c_rt_lightmeshes++;
                                c_rt_lighttris += numtriangles;
@@ -2073,11 +2073,11 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texcubemap[1] = R_GetTexture(r_shadow_normalcubetexture);
                                m.texcombinergb[1] = GL_DOT3_RGBA_ARB;
                                m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                               R_Shadow_GenTexCoords_Diffuse_NormalCubeMap(varray_texcoord3f[1], numverts, vertex3f, svector3f, tvector3f, normal3f, relativelightorigin);
+                               R_Shadow_GenTexCoords_Diffuse_NormalCubeMap(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, svector3f + 3 * firstvertex, tvector3f + 3 * firstvertex, normal3f + 3 * firstvertex, relativelightorigin);
                                R_Mesh_State(&m);
                                GL_BlendFunc(GL_DST_ALPHA, GL_ZERO);
-                               GL_LockArrays(0, numverts);
-                               R_Mesh_Draw(0, numverts, numtriangles, elements);
+                               GL_LockArrays(firstvertex, numvertices);
+                               R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                GL_LockArrays(0, 0);
                                c_rt_lightmeshes++;
                                c_rt_lighttris += numtriangles;
@@ -2094,7 +2094,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texmatrix[1] = *matrix_modeltolight;
 #else
                                        m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1], numverts, vertex3f, matrix_modeltolight);
+                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltolight);
 #endif
                                }
                                GL_BlendFunc(GL_DST_ALPHA, GL_ONE);
@@ -2103,11 +2103,11 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                        R_Mesh_State(&m);
                        GL_ColorMask(r_refdef.colormask[0], r_refdef.colormask[1], r_refdef.colormask[2], 0);
                        VectorScale(lightcolor, colorscale, color2);
-                       GL_LockArrays(0, numverts);
+                       GL_LockArrays(firstvertex, numvertices);
                        for (renders = 0;renders < 64 && (color2[0] > 0 || color2[1] > 0 || color2[2] > 0);renders++, color2[0]--, color2[1]--, color2[2]--)
                        {
                                GL_Color(bound(0, color2[0], 1), bound(0, color2[1], 1), bound(0, color2[2], 1), 1);
-                               R_Mesh_Draw(0, numverts, numtriangles, elements);
+                               R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                c_rt_lightmeshes++;
                                c_rt_lighttris += numtriangles;
                        }
@@ -2130,13 +2130,13 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texcubemap[1] = R_GetTexture(r_shadow_normalcubetexture);
                                        m.texcombinergb[1] = GL_DOT3_RGBA_ARB;
                                        m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                                       R_Shadow_GenTexCoords_Specular_NormalCubeMap(varray_texcoord3f[1], numverts, vertex3f, svector3f, tvector3f, normal3f, relativelightorigin, relativeeyeorigin);
+                                       R_Shadow_GenTexCoords_Specular_NormalCubeMap(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, svector3f + 3 * firstvertex, tvector3f + 3 * firstvertex, normal3f + 3 * firstvertex, relativelightorigin, relativeeyeorigin);
                                        R_Mesh_State(&m);
                                        GL_ColorMask(0,0,0,1);
                                        // this squares the result
                                        GL_BlendFunc(GL_SRC_ALPHA, GL_ZERO);
-                                       GL_LockArrays(0, numverts);
-                                       R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       GL_LockArrays(firstvertex, numvertices);
+                                       R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                        GL_LockArrays(0, 0);
                                        c_rt_lightmeshes++;
                                        c_rt_lighttris += numtriangles;
@@ -2144,17 +2144,17 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        memset(&m, 0, sizeof(m));
                                        m.pointer_vertex = vertex3f;
                                        R_Mesh_State(&m);
-                                       GL_LockArrays(0, numverts);
+                                       GL_LockArrays(firstvertex, numvertices);
                                        // square alpha in framebuffer a few times to make it shiny
                                        GL_BlendFunc(GL_ZERO, GL_DST_ALPHA);
                                        // these comments are a test run through this math for intensity 0.5
                                        // 0.5 * 0.5 = 0.25 (done by the BlendFunc earlier)
                                        // 0.25 * 0.25 = 0.0625 (this is another pass)
                                        // 0.0625 * 0.0625 = 0.00390625 (this is another pass)
-                                       R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                        c_rt_lightmeshes++;
                                        c_rt_lighttris += numtriangles;
-                                       R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                        c_rt_lightmeshes++;
                                        c_rt_lighttris += numtriangles;
                                        GL_LockArrays(0, 0);
@@ -2167,12 +2167,12 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texmatrix[0] = *matrix_modeltoattenuationxyz;
 #else
                                        m.pointer_texcoord3f[0] = varray_texcoord3f[0];
-                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[0], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[0] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                        R_Mesh_State(&m);
                                        GL_BlendFunc(GL_DST_ALPHA, GL_ZERO);
-                                       GL_LockArrays(0, numverts);
-                                       R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       GL_LockArrays(firstvertex, numvertices);
+                                       R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                        GL_LockArrays(0, 0);
                                        c_rt_lightmeshes++;
                                        c_rt_lighttris += numtriangles;
@@ -2189,7 +2189,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                                m.texmatrix[1] = *matrix_modeltolight;
 #else
                                                m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1], numverts, vertex3f, matrix_modeltolight);
+                                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltolight);
 #endif
                                        }
                                        GL_BlendFunc(GL_DST_ALPHA, GL_ONE);
@@ -2204,13 +2204,13 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texcubemap[1] = R_GetTexture(r_shadow_normalcubetexture);
                                        m.texcombinergb[1] = GL_DOT3_RGBA_ARB;
                                        m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                                       R_Shadow_GenTexCoords_Specular_NormalCubeMap(varray_texcoord3f[1], numverts, vertex3f, svector3f, tvector3f, normal3f, relativelightorigin, relativeeyeorigin);
+                                       R_Shadow_GenTexCoords_Specular_NormalCubeMap(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, svector3f + 3 * firstvertex, tvector3f + 3 * firstvertex, normal3f + 3 * firstvertex, relativelightorigin, relativeeyeorigin);
                                        R_Mesh_State(&m);
                                        GL_ColorMask(0,0,0,1);
                                        // this squares the result
                                        GL_BlendFunc(GL_SRC_ALPHA, GL_ZERO);
-                                       GL_LockArrays(0, numverts);
-                                       R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       GL_LockArrays(firstvertex, numvertices);
+                                       R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                        GL_LockArrays(0, 0);
                                        c_rt_lightmeshes++;
                                        c_rt_lighttris += numtriangles;
@@ -2218,17 +2218,17 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        memset(&m, 0, sizeof(m));
                                        m.pointer_vertex = vertex3f;
                                        R_Mesh_State(&m);
-                                       GL_LockArrays(0, numverts);
+                                       GL_LockArrays(firstvertex, numvertices);
                                        // square alpha in framebuffer a few times to make it shiny
                                        GL_BlendFunc(GL_ZERO, GL_DST_ALPHA);
                                        // these comments are a test run through this math for intensity 0.5
                                        // 0.5 * 0.5 = 0.25 (done by the BlendFunc earlier)
                                        // 0.25 * 0.25 = 0.0625 (this is another pass)
                                        // 0.0625 * 0.0625 = 0.00390625 (this is another pass)
-                                       R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                        c_rt_lightmeshes++;
                                        c_rt_lighttris += numtriangles;
-                                       R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                        c_rt_lightmeshes++;
                                        c_rt_lighttris += numtriangles;
                                        GL_LockArrays(0, 0);
@@ -2243,7 +2243,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texmatrix[1] = *matrix_modeltoattenuationxyz;
 #else
                                        m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                                       R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                        GL_BlendFunc(GL_DST_ALPHA, GL_ONE);
                                }
@@ -2257,13 +2257,13 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texcubemap[1] = R_GetTexture(r_shadow_normalcubetexture);
                                        m.texcombinergb[1] = GL_DOT3_RGBA_ARB;
                                        m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                                       R_Shadow_GenTexCoords_Specular_NormalCubeMap(varray_texcoord3f[1], numverts, vertex3f, svector3f, tvector3f, normal3f, relativelightorigin, relativeeyeorigin);
+                                       R_Shadow_GenTexCoords_Specular_NormalCubeMap(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, svector3f + 3 * firstvertex, tvector3f + 3 * firstvertex, normal3f + 3 * firstvertex, relativelightorigin, relativeeyeorigin);
                                        R_Mesh_State(&m);
                                        GL_ColorMask(0,0,0,1);
                                        // this squares the result
                                        GL_BlendFunc(GL_SRC_ALPHA, GL_ZERO);
-                                       GL_LockArrays(0, numverts);
-                                       R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       GL_LockArrays(firstvertex, numvertices);
+                                       R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                        GL_LockArrays(0, 0);
                                        c_rt_lightmeshes++;
                                        c_rt_lighttris += numtriangles;
@@ -2271,17 +2271,17 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        memset(&m, 0, sizeof(m));
                                        m.pointer_vertex = vertex3f;
                                        R_Mesh_State(&m);
-                                       GL_LockArrays(0, numverts);
+                                       GL_LockArrays(firstvertex, numvertices);
                                        // square alpha in framebuffer a few times to make it shiny
                                        GL_BlendFunc(GL_ZERO, GL_DST_ALPHA);
                                        // these comments are a test run through this math for intensity 0.5
                                        // 0.5 * 0.5 = 0.25 (done by the BlendFunc earlier)
                                        // 0.25 * 0.25 = 0.0625 (this is another pass)
                                        // 0.0625 * 0.0625 = 0.00390625 (this is another pass)
-                                       R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                        c_rt_lightmeshes++;
                                        c_rt_lighttris += numtriangles;
-                                       R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                        c_rt_lightmeshes++;
                                        c_rt_lighttris += numtriangles;
                                        GL_LockArrays(0, 0);
@@ -2294,7 +2294,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texmatrix[0] = *matrix_modeltoattenuationxyz;
 #else
                                        m.pointer_texcoord[0] = varray_texcoord2f[0];
-                                       R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[0], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                                       R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[0] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                        m.tex[1] = R_GetTexture(r_shadow_attenuation2dtexture);
 #ifdef USETEXMATRIX
@@ -2302,12 +2302,12 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texmatrix[1] = *matrix_modeltoattenuationz;
 #else
                                        m.pointer_texcoord[1] = varray_texcoord2f[1];
-                                       R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1], numverts, vertex3f, matrix_modeltoattenuationz);
+                                       R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationz);
 #endif
                                        R_Mesh_State(&m);
                                        GL_BlendFunc(GL_DST_ALPHA, GL_ZERO);
-                                       GL_LockArrays(0, numverts);
-                                       R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       GL_LockArrays(firstvertex, numvertices);
+                                       R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                        GL_LockArrays(0, 0);
                                        c_rt_lightmeshes++;
                                        c_rt_lighttris += numtriangles;
@@ -2324,7 +2324,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                                m.texmatrix[1] = *matrix_modeltolight;
 #else
                                                m.pointer_texcoord3f[1] = varray_texcoord3f[1];
-                                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1], numverts, vertex3f, matrix_modeltolight);
+                                               R_Shadow_Transform_Vertex3f_TexCoord3f(varray_texcoord3f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltolight);
 #endif
                                        }
                                        GL_BlendFunc(GL_DST_ALPHA, GL_ONE);
@@ -2332,11 +2332,11 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                R_Mesh_State(&m);
                                GL_ColorMask(r_refdef.colormask[0], r_refdef.colormask[1], r_refdef.colormask[2], 0);
                                VectorScale(lightcolor, colorscale, color2);
-                               GL_LockArrays(0, numverts);
+                               GL_LockArrays(firstvertex, numvertices);
                                for (renders = 0;renders < 64 && (color2[0] > 0 || color2[1] > 0 || color2[2] > 0);renders++, color2[0]--, color2[1]--, color2[2]--)
                                {
                                        GL_Color(bound(0, color2[0], 1), bound(0, color2[1], 1), bound(0, color2[2], 1), 1);
-                                       R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                        c_rt_lightmeshes++;
                                        c_rt_lighttris += numtriangles;
                                }
@@ -2363,7 +2363,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[1] = *matrix_modeltoattenuationxyz;
 #else
                                m.pointer_texcoord[1] = varray_texcoord2f[1];
-                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                if (r_textureunits.integer >= 3)
                                {
@@ -2374,7 +2374,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texmatrix[2] = *matrix_modeltoattenuationz;
 #else
                                        m.pointer_texcoord[2] = varray_texcoord2f[2];
-                                       R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[2], numverts, vertex3f, matrix_modeltoattenuationz);
+                                       R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[2] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationz);
 #endif
                                }
                        }
@@ -2391,11 +2391,11 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                if (r_textureunits.integer >= 3)
                                        GL_Color(color[0], color[1], color[2], 1);
                                else if (r_textureunits.integer >= 2)
-                                       R_Shadow_VertexNoShadingWithZAttenuation(numverts, vertex3f, color, matrix_modeltolight);
+                                       R_Shadow_VertexNoShadingWithZAttenuation(numvertices, vertex3f + 3 * firstvertex, color + 3 * firstvertex, matrix_modeltolight);
                                else
-                                       R_Shadow_VertexNoShadingWithXYZAttenuation(numverts, vertex3f, color, matrix_modeltolight);
-                               GL_LockArrays(0, numverts);
-                               R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       R_Shadow_VertexNoShadingWithXYZAttenuation(numvertices, vertex3f + 3 * firstvertex, color + 3 * firstvertex, matrix_modeltolight);
+                               GL_LockArrays(firstvertex, numvertices);
+                               R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                GL_LockArrays(0, 0);
                                c_rt_lightmeshes++;
                                c_rt_lighttris += numtriangles;
@@ -2419,7 +2419,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                m.texmatrix[1] = *matrix_modeltoattenuationxyz;
 #else
                                m.pointer_texcoord[1] = varray_texcoord2f[1];
-                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1], numverts, vertex3f, matrix_modeltoattenuationxyz);
+                               R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[1] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationxyz);
 #endif
                                if (r_textureunits.integer >= 3)
                                {
@@ -2430,7 +2430,7 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                        m.texmatrix[2] = *matrix_modeltoattenuationz;
 #else
                                        m.pointer_texcoord[2] = varray_texcoord2f[2];
-                                       R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[2], numverts, vertex3f, matrix_modeltoattenuationz);
+                                       R_Shadow_Transform_Vertex3f_TexCoord2f(varray_texcoord2f[2] + 3 * firstvertex, numvertices, vertex3f + 3 * firstvertex, matrix_modeltoattenuationz);
 #endif
                                }
                        }
@@ -2441,13 +2441,13 @@ void R_Shadow_RenderLighting(int numverts, int numtriangles, const int *elements
                                color[1] = bound(0, color2[1], 1);
                                color[2] = bound(0, color2[2], 1);
                                if (r_textureunits.integer >= 3)
-                                       R_Shadow_VertexShading(numverts, vertex3f, normal3f, color, matrix_modeltolight);
+                                       R_Shadow_VertexShading(numvertices, vertex3f + 3 * firstvertex, normal3f + 3 * firstvertex, color + 3 * firstvertex, matrix_modeltolight);
                                else if (r_textureunits.integer >= 2)
-                                       R_Shadow_VertexShadingWithZAttenuation(numverts, vertex3f, normal3f, color, matrix_modeltolight);
+                                       R_Shadow_VertexShadingWithZAttenuation(numvertices, vertex3f + 3 * firstvertex, normal3f + 3 * firstvertex, color + 3 * firstvertex, matrix_modeltolight);
                                else
-                                       R_Shadow_VertexShadingWithXYZAttenuation(numverts, vertex3f, normal3f, color, matrix_modeltolight);
-                               GL_LockArrays(0, numverts);
-                               R_Mesh_Draw(0, numverts, numtriangles, elements);
+                                       R_Shadow_VertexShadingWithXYZAttenuation(numvertices, vertex3f + 3 * firstvertex, normal3f + 3 * firstvertex, color + 3 * firstvertex, matrix_modeltolight);
+                               GL_LockArrays(firstvertex, numvertices);
+                               R_Mesh_Draw(firstvertex, numvertices, numtriangles, elements);
                                GL_LockArrays(0, 0);
                                c_rt_lightmeshes++;
                                c_rt_lighttris += numtriangles;
@@ -2804,7 +2804,7 @@ void R_DrawRTLight(rtlight_t *rtlight, int visiblevolumes)
                        {
                                R_Mesh_Matrix(&ent->matrix);
                                for (mesh = rtlight->static_meshchain_light;mesh;mesh = mesh->next)
-                                       R_Shadow_RenderLighting(mesh->numverts, mesh->numtriangles, mesh->element3i, mesh->vertex3f, mesh->svector3f, mesh->tvector3f, mesh->normal3f, mesh->texcoord2f, relativelightorigin, relativeeyeorigin, lightcolor2, &matrix_modeltolight, &matrix_modeltoattenuationxyz, &matrix_modeltoattenuationz, mesh->map_diffuse, mesh->map_normal, mesh->map_specular, cubemaptexture, rtlight->ambientscale, rtlight->diffusescale, rtlight->specularscale);
+                                       R_Shadow_RenderLighting(0, mesh->numverts, mesh->numtriangles, mesh->element3i, mesh->vertex3f, mesh->svector3f, mesh->tvector3f, mesh->normal3f, mesh->texcoord2f, relativelightorigin, relativeeyeorigin, lightcolor2, &matrix_modeltolight, &matrix_modeltoattenuationxyz, &matrix_modeltoattenuationz, mesh->map_diffuse, mesh->map_normal, mesh->map_specular, cubemaptexture, rtlight->ambientscale, rtlight->diffusescale, rtlight->specularscale);
                        }
                        else
                                ent->model->DrawLight(ent, relativelightorigin, relativeeyeorigin, rtlight->radius, lightcolor2, &matrix_modeltolight, &matrix_modeltoattenuationxyz, &matrix_modeltoattenuationz, cubemaptexture, rtlight->ambientscale, rtlight->diffusescale, rtlight->specularscale, numsurfaces, surfacelist);