gl_backend.c

   1
   2 #include "quakedef.h"
   3 #include "cl_collision.h"
   4
   5 cvar_t gl_mesh_drawrangeelements = {0, "gl_mesh_drawrangeelements", "1", "use glDrawRangeElements function if available instead of glDrawElements (for performance comparisons or bug testing)"};
   6 cvar_t gl_mesh_testarrayelement = {0, "gl_mesh_testarrayelement", "0", "use glBegin(GL_TRIANGLES);glArrayElement();glEnd(); primitives instead of glDrawElements (useful to test for driver bugs with glDrawElements)"};
   7 cvar_t gl_mesh_testmanualfeeding = {0, "gl_mesh_testmanualfeeding", "0", "use glBegin(GL_TRIANGLES);glTexCoord2f();glVertex3f();glEnd(); primitives instead of glDrawElements (useful to test for driver bugs with glDrawElements)"};
   8 cvar_t gl_mesh_prefer_short_elements = {0, "gl_mesh_prefer_short_elements", "1", "use GL_UNSIGNED_SHORT element arrays instead of GL_UNSIGNED_INT"};
   9 cvar_t gl_paranoid = {0, "gl_paranoid", "0", "enables OpenGL error checking and other tests"};
  10 cvar_t gl_printcheckerror = {0, "gl_printcheckerror", "0", "prints all OpenGL error checks, useful to identify location of driver crashes"};
  11
  12 cvar_t r_render = {0, "r_render", "1", "enables rendering 3D views (you want this on!)"};
  13 cvar_t r_renderview = {0, "r_renderview", "1", "enables rendering 3D views (you want this on!)"};
  14 cvar_t r_waterwarp = {CVAR_SAVE, "r_waterwarp", "1", "warp view while underwater"};
  15 cvar_t gl_polyblend = {CVAR_SAVE, "gl_polyblend", "1", "tints view while underwater, hurt, etc"};
  16 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1", "enables OpenGL dithering (16bit looks bad with this off)"};
  17 cvar_t gl_lockarrays = {0, "gl_lockarrays", "0", "enables use of glLockArraysEXT, may cause glitches with some broken drivers, and may be slower than normal"};
  18 cvar_t gl_lockarrays_minimumvertices = {0, "gl_lockarrays_minimumvertices", "1", "minimum number of vertices required for use of glLockArraysEXT, setting this too low may reduce performance"};
  19 cvar_t gl_vbo = {CVAR_SAVE, "gl_vbo", "3", "make use of GL_ARB_vertex_buffer_object extension to store static geometry in video memory for faster rendering, 0 disables VBO allocation or use, 1 enables VBOs for vertex and triangle data, 2 only for vertex data, 3 for vertex data and triangle data of simple meshes (ones with only one surface)"};
  20 cvar_t gl_fbo = {CVAR_SAVE, "gl_fbo", "1", "make use of GL_ARB_framebuffer_object extension to enable shadowmaps and other features using pixel formats different from the framebuffer"};
  21
  22 cvar_t v_flipped = {0, "v_flipped", "0", "mirror the screen (poor man's left handed mode)"};
  23 qboolean v_flipped_state = false;
  24
  25 int gl_maxdrawrangeelementsvertices;
  26 int gl_maxdrawrangeelementsindices;
  27
  28 #ifdef DEBUGGL
  29 int errornumber = 0;
  30
  31 void GL_PrintError(int errornumber, char *filename, int linenumber)
  32 {
  33         switch(errornumber)
  34         {
  35 #ifdef GL_INVALID_ENUM
  36         case GL_INVALID_ENUM:
  37                 Con_Printf("GL_INVALID_ENUM at %s:%i\n", filename, linenumber);
  38                 break;
  39 #endif
  40 #ifdef GL_INVALID_VALUE
  41         case GL_INVALID_VALUE:
  42                 Con_Printf("GL_INVALID_VALUE at %s:%i\n", filename, linenumber);
  43                 break;
  44 #endif
  45 #ifdef GL_INVALID_OPERATION
  46         case GL_INVALID_OPERATION:
  47                 Con_Printf("GL_INVALID_OPERATION at %s:%i\n", filename, linenumber);
  48                 break;
  49 #endif
  50 #ifdef GL_STACK_OVERFLOW
  51         case GL_STACK_OVERFLOW:
  52                 Con_Printf("GL_STACK_OVERFLOW at %s:%i\n", filename, linenumber);
  53                 break;
  54 #endif
  55 #ifdef GL_STACK_UNDERFLOW
  56         case GL_STACK_UNDERFLOW:
  57                 Con_Printf("GL_STACK_UNDERFLOW at %s:%i\n", filename, linenumber);
  58                 break;
  59 #endif
  60 #ifdef GL_OUT_OF_MEMORY
  61         case GL_OUT_OF_MEMORY:
  62                 Con_Printf("GL_OUT_OF_MEMORY at %s:%i\n", filename, linenumber);
  63                 break;
  64 #endif
  65 #ifdef GL_TABLE_TOO_LARGE
  66         case GL_TABLE_TOO_LARGE:
  67                 Con_Printf("GL_TABLE_TOO_LARGE at %s:%i\n", filename, linenumber);
  68                 break;
  69 #endif
  70 #ifdef GL_INVALID_FRAMEBUFFER_OPERATION_EXT
  71         case GL_INVALID_FRAMEBUFFER_OPERATION_EXT:
  72                 Con_Printf("GL_INVALID_FRAMEBUFFER_OPERATION at %s:%i\n", filename, linenumber);
  73                 break;
  74 #endif
  75         default:
  76                 Con_Printf("GL UNKNOWN (%i) at %s:%i\n", errornumber, filename, linenumber);
  77                 break;
  78         }
  79 }
  80 #endif
  81
  82 #define BACKENDACTIVECHECK if (!gl_state.active) Sys_Error("GL backend function called when backend is not active");
  83
  84 void SCR_ScreenShot_f (void);
  85
  86 typedef struct gl_bufferobjectinfo_s
  87 {
  88         int target;
  89         int object;
  90         size_t size;
  91         char name[MAX_QPATH];
  92 }
  93 gl_bufferobjectinfo_t;
  94
  95 typedef struct gltextureunit_s
  96 {
  97         const void *pointer_texcoord;
  98         size_t pointer_texcoord_offset;
  99         int pointer_texcoord_buffer;
 100         int t2d, t3d, tcubemap, trectangle;
 101         int arrayenabled;
 102         unsigned int arraycomponents;
 103         int rgbscale, alphascale;
 104         int combinergb, combinealpha;
 105         // texmatrixenabled exists only to avoid unnecessary texmatrix compares
 106         int texmatrixenabled;
 107         matrix4x4_t matrix;
 108 }
 109 gltextureunit_t;
 110
 111 typedef struct gl_state_s
 112 {
 113         int cullface;
 114         int cullfaceenable;
 115         int blendfunc1;
 116         int blendfunc2;
 117         int blend;
 118         GLboolean depthmask;
 119         int colormask; // stored as bottom 4 bits: r g b a (3 2 1 0 order)
 120         int depthtest;
 121         float depthrange[2];
 122         float polygonoffset[2];
 123         int alphatest;
 124         int scissortest;
 125         unsigned int unit;
 126         unsigned int clientunit;
 127         gltextureunit_t units[MAX_TEXTUREUNITS];
 128         float color4f[4];
 129         int lockrange_first;
 130         int lockrange_count;
 131         int vertexbufferobject;
 132         int elementbufferobject;
 133         qboolean pointer_color_enabled;
 134         const void *pointer_vertex;
 135         const void *pointer_color;
 136         size_t pointer_vertex_offset;
 137         size_t pointer_color_offset;
 138         int pointer_vertex_buffer;
 139         int pointer_color_buffer;
 140         qboolean active;
 141 }
 142 gl_state_t;
 143
 144 static gl_state_t gl_state;
 145
 146 static memexpandablearray_t gl_bufferobjectinfoarray;
 147
 148 static r_viewport_t backend_viewport;
 149 static matrix4x4_t backend_modelmatrix;
 150 static matrix4x4_t backend_modelviewmatrix;
 151
 152 /*
 153 note: here's strip order for a terrain row:
 154 0--1--2--3--4
 155 |\ |\ |\ |\ |
 156 | \| \| \| \|
 157 A--B--C--D--E
 158 clockwise
 159
 160 A0B, 01B, B1C, 12C, C2D, 23D, D3E, 34E
 161
 162 *elements++ = i + row;
 163 *elements++ = i;
 164 *elements++ = i + row + 1;
 165 *elements++ = i;
 166 *elements++ = i + 1;
 167 *elements++ = i + row + 1;
 168
 169
 170 for (y = 0;y < rows - 1;y++)
 171 {
 172         for (x = 0;x < columns - 1;x++)
 173         {
 174                 i = y * rows + x;
 175                 *elements++ = i + columns;
 176                 *elements++ = i;
 177                 *elements++ = i + columns + 1;
 178                 *elements++ = i;
 179                 *elements++ = i + 1;
 180                 *elements++ = i + columns + 1;
 181         }
 182 }
 183
 184 alternative:
 185 0--1--2--3--4
 186 | /| /|\ | /|
 187 |/ |/ | \|/ |
 188 A--B--C--D--E
 189 counterclockwise
 190
 191 for (y = 0;y < rows - 1;y++)
 192 {
 193         for (x = 0;x < columns - 1;x++)
 194         {
 195                 i = y * rows + x;
 196                 *elements++ = i;
 197                 *elements++ = i + columns;
 198                 *elements++ = i + columns + 1;
 199                 *elements++ = i + columns;
 200                 *elements++ = i + columns + 1;
 201                 *elements++ = i + 1;
 202         }
 203 }
 204 */
 205
 206 int polygonelement3i[(POLYGONELEMENTS_MAXPOINTS-2)*3];
 207 unsigned short polygonelement3s[(POLYGONELEMENTS_MAXPOINTS-2)*3];
 208 int quadelement3i[QUADELEMENTS_MAXQUADS*6];
 209 unsigned short quadelement3s[QUADELEMENTS_MAXQUADS*6];
 210
 211 void GL_VBOStats_f(void)
 212 {
 213         GL_Mesh_ListVBOs(true);
 214 }
 215
 216 static void GL_Backend_ResetState(void);
 217
 218 static void gl_backend_start(void)
 219 {
 220         CHECKGLERROR
 221
 222         if (qglDrawRangeElements != NULL)
 223         {
 224                 CHECKGLERROR
 225                 qglGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &gl_maxdrawrangeelementsvertices);
 226                 CHECKGLERROR
 227                 qglGetIntegerv(GL_MAX_ELEMENTS_INDICES, &gl_maxdrawrangeelementsindices);
 228                 CHECKGLERROR
 229                 Con_DPrintf("GL_MAX_ELEMENTS_VERTICES = %i\nGL_MAX_ELEMENTS_INDICES = %i\n", gl_maxdrawrangeelementsvertices, gl_maxdrawrangeelementsindices);
 230         }
 231
 232         if (vid.support.arb_fragment_shader)
 233         {
 234                 Con_DPrintf("GLSL shader support detected: texture units = %i texenv, %i image, %i array\n", vid.texunits, vid.teximageunits, vid.texarrayunits);
 235                 vid.teximageunits = bound(1, vid.teximageunits, MAX_TEXTUREUNITS);
 236                 vid.texarrayunits = bound(1, vid.texarrayunits, MAX_TEXTUREUNITS);
 237         }
 238         else
 239                 Con_DPrintf("GL_MAX_TEXTUREUNITS = %i\n", vid.texunits);
 240
 241         Mem_ExpandableArray_NewArray(&gl_bufferobjectinfoarray, r_main_mempool, sizeof(gl_bufferobjectinfo_t), 128);
 242
 243         Con_DPrintf("OpenGL backend started.\n");
 244
 245         CHECKGLERROR
 246
 247         gl_state.active = true;
 248         GL_Backend_ResetState();
 249 }
 250
 251 static void gl_backend_shutdown(void)
 252 {
 253         gl_state.active = false;
 254
 255         Con_DPrint("OpenGL Backend shutting down\n");
 256
 257         Mem_ExpandableArray_FreeArray(&gl_bufferobjectinfoarray);
 258
 259         memset(&gl_state, 0, sizeof(gl_state));
 260 }
 261
 262 static void gl_backend_newmap(void)
 263 {
 264 }
 265
 266 void gl_backend_init(void)
 267 {
 268         int i;
 269
 270         for (i = 0;i < POLYGONELEMENTS_MAXPOINTS - 2;i++)
 271         {
 272                 polygonelement3s[i * 3 + 0] = 0;
 273                 polygonelement3s[i * 3 + 1] = i + 1;
 274                 polygonelement3s[i * 3 + 2] = i + 2;
 275         }
 276         // elements for rendering a series of quads as triangles
 277         for (i = 0;i < QUADELEMENTS_MAXQUADS;i++)
 278         {
 279                 quadelement3s[i * 6 + 0] = i * 4;
 280                 quadelement3s[i * 6 + 1] = i * 4 + 1;
 281                 quadelement3s[i * 6 + 2] = i * 4 + 2;
 282                 quadelement3s[i * 6 + 3] = i * 4;
 283                 quadelement3s[i * 6 + 4] = i * 4 + 2;
 284                 quadelement3s[i * 6 + 5] = i * 4 + 3;
 285         }
 286
 287         for (i = 0;i < (POLYGONELEMENTS_MAXPOINTS - 2)*3;i++)
 288                 polygonelement3i[i] = polygonelement3s[i];
 289         for (i = 0;i < QUADELEMENTS_MAXQUADS*3;i++)
 290                 quadelement3i[i] = quadelement3s[i];
 291
 292         Cvar_RegisterVariable(&r_render);
 293         Cvar_RegisterVariable(&r_renderview);
 294         Cvar_RegisterVariable(&r_waterwarp);
 295         Cvar_RegisterVariable(&gl_polyblend);
 296         Cvar_RegisterVariable(&v_flipped);
 297         Cvar_RegisterVariable(&gl_dither);
 298         Cvar_RegisterVariable(&gl_lockarrays);
 299         Cvar_RegisterVariable(&gl_lockarrays_minimumvertices);
 300         Cvar_RegisterVariable(&gl_vbo);
 301         Cvar_RegisterVariable(&gl_paranoid);
 302         Cvar_RegisterVariable(&gl_printcheckerror);
 303
 304         Cvar_RegisterVariable(&gl_mesh_drawrangeelements);
 305         Cvar_RegisterVariable(&gl_mesh_testarrayelement);
 306         Cvar_RegisterVariable(&gl_mesh_testmanualfeeding);
 307         Cvar_RegisterVariable(&gl_mesh_prefer_short_elements);
 308
 309         Cmd_AddCommand("gl_vbostats", GL_VBOStats_f, "prints a list of all buffer objects (vertex data and triangle elements) and total video memory used by them");
 310
 311         R_RegisterModule("GL_Backend", gl_backend_start, gl_backend_shutdown, gl_backend_newmap);
 312 }
 313
 314 void GL_SetMirrorState(qboolean state);
 315
 316 void R_Viewport_TransformToScreen(const r_viewport_t *v, const vec4_t in, vec4_t out)
 317 {
 318         vec4_t temp;
 319         float iw;
 320         Matrix4x4_Transform4 (&v->viewmatrix, in, temp);
 321         Matrix4x4_Transform4 (&v->projectmatrix, temp, out);
 322         iw = 1.0f / out[3];
 323         out[0] = v->x + (out[0] * iw + 1.0f) * v->width * 0.5f;
 324         out[1] = v->y + v->height - (out[1] * iw + 1.0f) * v->height * 0.5f;
 325         out[2] = v->z + (out[2] * iw + 1.0f) * v->depth * 0.5f;
 326 }
 327
 328 static void R_Viewport_ApplyNearClipPlane(r_viewport_t *v, double normalx, double normaly, double normalz, double dist)
 329 {
 330         double q[4];
 331         double d;
 332         float clipPlane[4], v3[3], v4[3];
 333         float normal[3];
 334
 335         // This is inspired by Oblique Depth Projection from http://www.terathon.com/code/oblique.php
 336
 337         VectorSet(normal, normalx, normaly, normalz);
 338         Matrix4x4_Transform3x3(&v->viewmatrix, normal, clipPlane);
 339         VectorScale(normal, dist, v3);
 340         Matrix4x4_Transform(&v->viewmatrix, v3, v4);
 341         // FIXME: LordHavoc: I think this can be done more efficiently somehow but I can't remember the technique
 342         clipPlane[3] = -DotProduct(v4, clipPlane);
 343
 344 #if 0
 345 {
 346         // testing code for comparing results
 347         float clipPlane2[4];
 348         VectorCopy4(clipPlane, clipPlane2);
 349         R_Mesh_Matrix(&identitymatrix);
 350         VectorSet(q, normal[0], normal[1], normal[2], -dist);
 351         qglClipPlane(GL_CLIP_PLANE0, q);
 352         qglGetClipPlane(GL_CLIP_PLANE0, q);
 353         VectorCopy4(q, clipPlane);
 354 }
 355 #endif
 356
 357         // Calculate the clip-space corner point opposite the clipping plane
 358         // as (sgn(clipPlane.x), sgn(clipPlane.y), 1, 1) and
 359         // transform it into camera space by multiplying it
 360         // by the inverse of the projection matrix
 361         q[0] = ((clipPlane[0] < 0.0f ? -1.0f : clipPlane[0] > 0.0f ? 1.0f : 0.0f) + v->m[8]) / v->m[0];
 362         q[1] = ((clipPlane[1] < 0.0f ? -1.0f : clipPlane[1] > 0.0f ? 1.0f : 0.0f) + v->m[9]) / v->m[5];
 363         q[2] = -1.0f;
 364         q[3] = (1.0f + v->m[10]) / v->m[14];
 365
 366         // Calculate the scaled plane vector
 367         d = 2.0f / DotProduct4(clipPlane, q);
 368
 369         // Replace the third row of the projection matrix
 370         v->m[2] = clipPlane[0] * d;
 371         v->m[6] = clipPlane[1] * d;
 372         v->m[10] = clipPlane[2] * d + 1.0f;
 373         v->m[14] = clipPlane[3] * d;
 374 }
 375
 376 void R_Viewport_InitOrtho(r_viewport_t *v, const matrix4x4_t *cameramatrix, int x, int y, int width, int height, double x1, double y1, double x2, double y2, double nearclip, double farclip, const double *nearplane)
 377 {
 378         float left = x1, right = x2, bottom = y2, top = y1, zNear = nearclip, zFar = farclip;
 379         memset(v, 0, sizeof(*v));
 380         v->type = R_VIEWPORTTYPE_ORTHO;
 381         v->cameramatrix = *cameramatrix;
 382         v->x = x;
 383         v->y = y;
 384         v->z = 0;
 385         v->width = width;
 386         v->height = height;
 387         v->depth = 1;
 388         v->m[0]  = 2/(right - left);
 389         v->m[5]  = 2/(top - bottom);
 390         v->m[10] = -2/(zFar - zNear);
 391         v->m[12] = - (right + left)/(right - left);
 392         v->m[13] = - (top + bottom)/(top - bottom);
 393         v->m[14] = - (zFar + zNear)/(zFar - zNear);
 394         v->m[15] = 1;
 395
 396         Matrix4x4_Invert_Full(&v->viewmatrix, &v->cameramatrix);
 397         Matrix4x4_FromArrayDoubleGL(&v->projectmatrix, v->m);
 398
 399         if (nearplane)
 400                 R_Viewport_ApplyNearClipPlane(v, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 401
 402 #if 0
 403         {
 404                 vec4_t test1;
 405                 vec4_t test2;
 406                 Vector4Set(test1, (x1+x2)*0.5f, (y1+y2)*0.5f, 0.0f, 1.0f);
 407                 R_Viewport_TransformToScreen(v, test1, test2);
 408                 Con_Printf("%f %f %f -> %f %f %f\n", test1[0], test1[1], test1[2], test2[0], test2[1], test2[2]);
 409         }
 410 #endif
 411 }
 412
 413 void R_Viewport_InitPerspective(r_viewport_t *v, const matrix4x4_t *cameramatrix, int x, int y, int width, int height, double frustumx, double frustumy, double nearclip, double farclip, const double *nearplane)
 414 {
 415         matrix4x4_t tempmatrix, basematrix;
 416         memset(v, 0, sizeof(*v));
 417
 418         if(v_flipped.integer)
 419                 frustumx = -frustumx;
 420
 421         v->type = R_VIEWPORTTYPE_PERSPECTIVE;
 422         v->cameramatrix = *cameramatrix;
 423         v->x = x;
 424         v->y = y;
 425         v->z = 0;
 426         v->width = width;
 427         v->height = height;
 428         v->depth = 1;
 429         v->m[0]  = 1.0 / frustumx;
 430         v->m[5]  = 1.0 / frustumy;
 431         v->m[10] = -(farclip + nearclip) / (farclip - nearclip);
 432         v->m[11] = -1;
 433         v->m[14] = -2 * nearclip * farclip / (farclip - nearclip);
 434
 435         Matrix4x4_Invert_Full(&tempmatrix, &v->cameramatrix);
 436         Matrix4x4_CreateRotate(&basematrix, -90, 1, 0, 0);
 437         Matrix4x4_ConcatRotate(&basematrix, 90, 0, 0, 1);
 438         Matrix4x4_Concat(&v->viewmatrix, &basematrix, &tempmatrix);
 439
 440         Matrix4x4_FromArrayDoubleGL(&v->projectmatrix, v->m);
 441
 442         if (nearplane)
 443                 R_Viewport_ApplyNearClipPlane(v, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 444 }
 445
 446 void R_Viewport_InitPerspectiveInfinite(r_viewport_t *v, const matrix4x4_t *cameramatrix, int x, int y, int width, int height, double frustumx, double frustumy, double nearclip, const double *nearplane)
 447 {
 448         matrix4x4_t tempmatrix, basematrix;
 449         const double nudge = 1.0 - 1.0 / (1<<23);
 450         memset(v, 0, sizeof(*v));
 451
 452         if(v_flipped.integer)
 453                 frustumx = -frustumx;
 454
 455         v->type = R_VIEWPORTTYPE_PERSPECTIVE_INFINITEFARCLIP;
 456         v->cameramatrix = *cameramatrix;
 457         v->x = x;
 458         v->y = y;
 459         v->z = 0;
 460         v->width = width;
 461         v->height = height;
 462         v->depth = 1;
 463         v->m[ 0] = 1.0 / frustumx;
 464         v->m[ 5] = 1.0 / frustumy;
 465         v->m[10] = -nudge;
 466         v->m[11] = -1;
 467         v->m[14] = -2 * nearclip * nudge;
 468
 469         Matrix4x4_Invert_Full(&tempmatrix, &v->cameramatrix);
 470         Matrix4x4_CreateRotate(&basematrix, -90, 1, 0, 0);
 471         Matrix4x4_ConcatRotate(&basematrix, 90, 0, 0, 1);
 472         Matrix4x4_Concat(&v->viewmatrix, &basematrix, &tempmatrix);
 473
 474         Matrix4x4_FromArrayDoubleGL(&v->projectmatrix, v->m);
 475
 476         if (nearplane)
 477                 R_Viewport_ApplyNearClipPlane(v, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 478 }
 479
 480 float cubeviewmatrix[6][16] =
 481 {
 482     // standard cubemap projections
 483     { // +X
 484          0, 0,-1, 0,
 485          0,-1, 0, 0,
 486         -1, 0, 0, 0,
 487          0, 0, 0, 1,
 488     },
 489     { // -X
 490          0, 0, 1, 0,
 491          0,-1, 0, 0,
 492          1, 0, 0, 0,
 493          0, 0, 0, 1,
 494     },
 495     { // +Y
 496          1, 0, 0, 0,
 497          0, 0,-1, 0,
 498          0, 1, 0, 0,
 499          0, 0, 0, 1,
 500     },
 501     { // -Y
 502          1, 0, 0, 0,
 503          0, 0, 1, 0,
 504          0,-1, 0, 0,
 505          0, 0, 0, 1,
 506     },
 507     { // +Z
 508          1, 0, 0, 0,
 509          0,-1, 0, 0,
 510          0, 0,-1, 0,
 511          0, 0, 0, 1,
 512     },
 513     { // -Z
 514         -1, 0, 0, 0,
 515          0,-1, 0, 0,
 516          0, 0, 1, 0,
 517          0, 0, 0, 1,
 518     },
 519 };
 520 float rectviewmatrix[6][16] =
 521 {
 522     // sign-preserving cubemap projections
 523     { // +X
 524          0, 0,-1, 0,
 525          0, 1, 0, 0,
 526          1, 0, 0, 0,
 527          0, 0, 0, 1,
 528     },
 529     { // -X
 530          0, 0, 1, 0,
 531          0, 1, 0, 0,
 532          1, 0, 0, 0,
 533          0, 0, 0, 1,
 534     },
 535     { // +Y
 536          1, 0, 0, 0,
 537          0, 0,-1, 0,
 538          0, 1, 0, 0,
 539          0, 0, 0, 1,
 540     },
 541     { // -Y
 542          1, 0, 0, 0,
 543          0, 0, 1, 0,
 544          0, 1, 0, 0,
 545          0, 0, 0, 1,
 546     },
 547     { // +Z
 548          1, 0, 0, 0,
 549          0, 1, 0, 0,
 550          0, 0,-1, 0,
 551          0, 0, 0, 1,
 552     },
 553     { // -Z
 554          1, 0, 0, 0,
 555          0, 1, 0, 0,
 556          0, 0, 1, 0,
 557          0, 0, 0, 1,
 558     },
 559 };
 560
 561 void R_Viewport_InitCubeSideView(r_viewport_t *v, const matrix4x4_t *cameramatrix, int side, int size, float nearclip, float farclip, const float *nearplane)
 562 {
 563         matrix4x4_t tempmatrix, basematrix;
 564         memset(v, 0, sizeof(*v));
 565         v->type = R_VIEWPORTTYPE_PERSPECTIVECUBESIDE;
 566         v->cameramatrix = *cameramatrix;
 567         v->width = size;
 568         v->height = size;
 569         v->depth = 1;
 570         v->m[0] = v->m[5] = 1.0f;
 571         v->m[10] = -(farclip + nearclip) / (farclip - nearclip);
 572         v->m[11] = -1;
 573         v->m[14] = -2 * nearclip * farclip / (farclip - nearclip);
 574
 575         Matrix4x4_FromArrayFloatGL(&basematrix, cubeviewmatrix[side]);
 576         Matrix4x4_Invert_Simple(&tempmatrix, &v->cameramatrix);
 577         Matrix4x4_Concat(&v->viewmatrix, &basematrix, &tempmatrix);
 578         Matrix4x4_FromArrayDoubleGL(&v->projectmatrix, v->m);
 579
 580         if (nearplane)
 581                 R_Viewport_ApplyNearClipPlane(v, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 582 }
 583
 584 void R_Viewport_InitRectSideView(r_viewport_t *v, const matrix4x4_t *cameramatrix, int side, int size, int border, float nearclip, float farclip, const float *nearplane)
 585 {
 586         matrix4x4_t tempmatrix, basematrix;
 587         memset(v, 0, sizeof(*v));
 588         v->type = R_VIEWPORTTYPE_PERSPECTIVECUBESIDE;
 589         v->cameramatrix = *cameramatrix;
 590         v->x = (side & 1) * size;
 591         v->y = (side >> 1) * size;
 592         v->width = size;
 593         v->height = size;
 594         v->depth = 1;
 595         v->m[0] = v->m[5] = 1.0f * ((float)size - border) / size;
 596         v->m[10] = -(farclip + nearclip) / (farclip - nearclip);
 597         v->m[11] = -1;
 598         v->m[14] = -2 * nearclip * farclip / (farclip - nearclip);
 599
 600         Matrix4x4_FromArrayFloatGL(&basematrix, rectviewmatrix[side]);
 601         Matrix4x4_Invert_Simple(&tempmatrix, &v->cameramatrix);
 602         Matrix4x4_Concat(&v->viewmatrix, &basematrix, &tempmatrix);
 603         Matrix4x4_FromArrayDoubleGL(&v->projectmatrix, v->m);
 604
 605         if (nearplane)
 606                 R_Viewport_ApplyNearClipPlane(v, nearplane[0], nearplane[1], nearplane[2], nearplane[3]);
 607 }
 608
 609 void R_SetViewport(const r_viewport_t *v)
 610 {
 611         float glmatrix[16];
 612         backend_viewport = *v;
 613
 614         CHECKGLERROR
 615         qglViewport(v->x, v->y, v->width, v->height);CHECKGLERROR
 616
 617         // Load the projection matrix into OpenGL
 618         qglMatrixMode(GL_PROJECTION);CHECKGLERROR
 619         qglLoadMatrixd(backend_viewport.m);CHECKGLERROR
 620         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 621
 622         // FIXME: v_flipped_state is evil, this probably breaks somewhere
 623         GL_SetMirrorState(v_flipped.integer && (v->type == R_VIEWPORTTYPE_PERSPECTIVE || v->type == R_VIEWPORTTYPE_PERSPECTIVE_INFINITEFARCLIP));
 624
 625         // directly force an update of the modelview matrix
 626         Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewport.viewmatrix, &backend_modelmatrix);
 627         Matrix4x4_ToArrayFloatGL(&backend_modelviewmatrix, glmatrix);
 628         qglLoadMatrixf(glmatrix);CHECKGLERROR
 629 }
 630
 631 void R_GetViewport(r_viewport_t *v)
 632 {
 633         *v = backend_viewport;
 634 }
 635
 636 static void GL_BindVBO(int bufferobject)
 637 {
 638         if (gl_state.vertexbufferobject != bufferobject)
 639         {
 640                 gl_state.vertexbufferobject = bufferobject;
 641                 CHECKGLERROR
 642                 qglBindBufferARB(GL_ARRAY_BUFFER_ARB, bufferobject);
 643                 CHECKGLERROR
 644         }
 645 }
 646
 647 static void GL_BindEBO(int bufferobject)
 648 {
 649         if (gl_state.elementbufferobject != bufferobject)
 650         {
 651                 gl_state.elementbufferobject = bufferobject;
 652                 CHECKGLERROR
 653                 qglBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, bufferobject);
 654                 CHECKGLERROR
 655         }
 656 }
 657
 658 static void GL_Backend_ResetState(void)
 659 {
 660         unsigned int i;
 661         gltextureunit_t *unit;
 662         memset(&gl_state, 0, sizeof(gl_state));
 663         gl_state.active = true;
 664         gl_state.depthtest = true;
 665         gl_state.alphatest = false;
 666         gl_state.blendfunc1 = GL_ONE;
 667         gl_state.blendfunc2 = GL_ZERO;
 668         gl_state.blend = false;
 669         gl_state.depthmask = GL_TRUE;
 670         gl_state.colormask = 15;
 671         gl_state.color4f[0] = gl_state.color4f[1] = gl_state.color4f[2] = gl_state.color4f[3] = 1;
 672         gl_state.lockrange_first = 0;
 673         gl_state.lockrange_count = 0;
 674         gl_state.cullface = v_flipped_state ? GL_BACK : GL_FRONT; // quake is backwards, this culls back faces
 675         gl_state.cullfaceenable = true;
 676         gl_state.polygonoffset[0] = 0;
 677         gl_state.polygonoffset[1] = 0;
 678
 679         CHECKGLERROR
 680
 681         qglColorMask(1, 1, 1, 1);
 682         qglAlphaFunc(GL_GEQUAL, 0.5);CHECKGLERROR
 683         qglDisable(GL_ALPHA_TEST);CHECKGLERROR
 684         qglBlendFunc(gl_state.blendfunc1, gl_state.blendfunc2);CHECKGLERROR
 685         qglDisable(GL_BLEND);CHECKGLERROR
 686         qglCullFace(gl_state.cullface);CHECKGLERROR
 687         qglEnable(GL_CULL_FACE);CHECKGLERROR
 688         qglDepthFunc(GL_LEQUAL);CHECKGLERROR
 689         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 690         qglDepthMask(gl_state.depthmask);CHECKGLERROR
 691         qglPolygonOffset(gl_state.polygonoffset[0], gl_state.polygonoffset[1]);
 692
 693         if (vid.support.arb_vertex_buffer_object)
 694         {
 695                 qglBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
 696                 qglBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 0);
 697         }
 698
 699         if (vid.support.ext_framebuffer_object)
 700         {
 701                 qglBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
 702                 qglBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
 703         }
 704
 705         qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), NULL);CHECKGLERROR
 706         qglEnableClientState(GL_VERTEX_ARRAY);CHECKGLERROR
 707
 708         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), NULL);CHECKGLERROR
 709         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
 710
 711         GL_Color(0, 0, 0, 0);
 712         GL_Color(1, 1, 1, 1);
 713
 714         gl_state.unit = MAX_TEXTUREUNITS;
 715         gl_state.clientunit = MAX_TEXTUREUNITS;
 716         for (i = 0;i < MAX_TEXTUREUNITS;i++)
 717         {
 718                 unit = gl_state.units + i;
 719                 unit->rgbscale = 1;
 720                 unit->alphascale = 1;
 721                 unit->combinergb = GL_MODULATE;
 722                 unit->combinealpha = GL_MODULATE;
 723                 unit->matrix = identitymatrix;
 724         }
 725
 726         for (i = 0;i < vid.teximageunits;i++)
 727         {
 728                 GL_ActiveTexture(i);
 729                 qglBindTexture(GL_TEXTURE_2D, 0);CHECKGLERROR
 730                 if (vid.support.ext_texture_3d)
 731                 {
 732                         qglBindTexture(GL_TEXTURE_3D, 0);CHECKGLERROR
 733                 }
 734                 if (vid.support.arb_texture_cube_map)
 735                 {
 736                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, 0);CHECKGLERROR
 737                 }
 738                 if (vid.support.arb_texture_rectangle)
 739                 {
 740                         qglBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);CHECKGLERROR
 741                 }
 742         }
 743
 744         for (i = 0;i < vid.texarrayunits;i++)
 745         {
 746                 GL_ClientActiveTexture(i);
 747                 GL_BindVBO(0);
 748                 qglTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), NULL);CHECKGLERROR
 749                 qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
 750         }
 751
 752         for (i = 0;i < vid.texunits;i++)
 753         {
 754                 GL_ActiveTexture(i);
 755                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
 756                 if (vid.support.ext_texture_3d)
 757                 {
 758                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
 759                 }
 760                 if (vid.support.arb_texture_cube_map)
 761                 {
 762                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
 763                 }
 764                 if (vid.support.arb_texture_rectangle)
 765                 {
 766                         qglDisable(GL_TEXTURE_RECTANGLE_ARB);CHECKGLERROR
 767                 }
 768                 qglMatrixMode(GL_TEXTURE);CHECKGLERROR
 769                 qglLoadIdentity();CHECKGLERROR
 770                 qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
 771                 if (gl_combine.integer)
 772                 {
 773                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);CHECKGLERROR
 774                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);CHECKGLERROR
 775                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);CHECKGLERROR
 776                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 777                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_TEXTURE);CHECKGLERROR // for GL_INTERPOLATE_ARB mode
 778                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 779                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);CHECKGLERROR
 780                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);CHECKGLERROR
 781                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_MODULATE);CHECKGLERROR
 782                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);CHECKGLERROR
 783                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, GL_PREVIOUS_ARB);CHECKGLERROR
 784                         qglTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, GL_CONSTANT_ARB);CHECKGLERROR
 785                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 786                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 787                         qglTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, GL_SRC_ALPHA);CHECKGLERROR
 788                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1);CHECKGLERROR
 789                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, 1);CHECKGLERROR
 790                 }
 791                 else
 792                 {
 793                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);CHECKGLERROR
 794                 }
 795                 CHECKGLERROR
 796         }
 797         CHECKGLERROR
 798 }
 799
 800 void GL_ActiveTexture(unsigned int num)
 801 {
 802         if (gl_state.unit != num)
 803         {
 804                 gl_state.unit = num;
 805                 if (qglActiveTexture)
 806                 {
 807                         CHECKGLERROR
 808                         qglActiveTexture(GL_TEXTURE0_ARB + gl_state.unit);
 809                         CHECKGLERROR
 810                 }
 811         }
 812 }
 813
 814 void GL_ClientActiveTexture(unsigned int num)
 815 {
 816         if (gl_state.clientunit != num)
 817         {
 818                 gl_state.clientunit = num;
 819                 if (qglActiveTexture)
 820                 {
 821                         CHECKGLERROR
 822                         qglClientActiveTexture(GL_TEXTURE0_ARB + gl_state.clientunit);
 823                         CHECKGLERROR
 824                 }
 825         }
 826 }
 827
 828 void GL_BlendFunc(int blendfunc1, int blendfunc2)
 829 {
 830         if (gl_state.blendfunc1 != blendfunc1 || gl_state.blendfunc2 != blendfunc2)
 831         {
 832                 CHECKGLERROR
 833                 qglBlendFunc(gl_state.blendfunc1 = blendfunc1, gl_state.blendfunc2 = blendfunc2);CHECKGLERROR
 834                 if (gl_state.blendfunc2 == GL_ZERO)
 835                 {
 836                         if (gl_state.blendfunc1 == GL_ONE)
 837                         {
 838                                 if (gl_state.blend)
 839                                 {
 840                                         gl_state.blend = 0;
 841                                         qglDisable(GL_BLEND);CHECKGLERROR
 842                                 }
 843                         }
 844                         else
 845                         {
 846                                 if (!gl_state.blend)
 847                                 {
 848                                         gl_state.blend = 1;
 849                                         qglEnable(GL_BLEND);CHECKGLERROR
 850                                 }
 851                         }
 852                 }
 853                 else
 854                 {
 855                         if (!gl_state.blend)
 856                         {
 857                                 gl_state.blend = 1;
 858                                 qglEnable(GL_BLEND);CHECKGLERROR
 859                         }
 860                 }
 861         }
 862 }
 863
 864 void GL_DepthMask(int state)
 865 {
 866         if (gl_state.depthmask != state)
 867         {
 868                 CHECKGLERROR
 869                 qglDepthMask(gl_state.depthmask = state);CHECKGLERROR
 870         }
 871 }
 872
 873 void GL_DepthTest(int state)
 874 {
 875         if (gl_state.depthtest != state)
 876         {
 877                 gl_state.depthtest = state;
 878                 CHECKGLERROR
 879                 if (gl_state.depthtest)
 880                 {
 881                         qglEnable(GL_DEPTH_TEST);CHECKGLERROR
 882                 }
 883                 else
 884                 {
 885                         qglDisable(GL_DEPTH_TEST);CHECKGLERROR
 886                 }
 887         }
 888 }
 889
 890 void GL_DepthRange(float nearfrac, float farfrac)
 891 {
 892         if (gl_state.depthrange[0] != nearfrac || gl_state.depthrange[1] != farfrac)
 893         {
 894                 gl_state.depthrange[0] = nearfrac;
 895                 gl_state.depthrange[1] = farfrac;
 896                 qglDepthRange(nearfrac, farfrac);
 897         }
 898 }
 899
 900 void GL_PolygonOffset(float planeoffset, float depthoffset)
 901 {
 902         if (gl_state.polygonoffset[0] != planeoffset || gl_state.polygonoffset[1] != depthoffset)
 903         {
 904                 gl_state.polygonoffset[0] = planeoffset;
 905                 gl_state.polygonoffset[1] = depthoffset;
 906                 qglPolygonOffset(planeoffset, depthoffset);
 907         }
 908 }
 909
 910 void GL_SetMirrorState(qboolean state)
 911 {
 912         if(!state != !v_flipped_state)
 913         {
 914                 // change cull face mode!
 915                 if(gl_state.cullface == GL_BACK)
 916                         qglCullFace((gl_state.cullface = GL_FRONT));
 917                 else if(gl_state.cullface == GL_FRONT)
 918                         qglCullFace((gl_state.cullface = GL_BACK));
 919         }
 920         v_flipped_state = state;
 921 }
 922
 923 void GL_CullFace(int state)
 924 {
 925         CHECKGLERROR
 926
 927         if(v_flipped_state)
 928         {
 929                 if(state == GL_FRONT)
 930                         state = GL_BACK;
 931                 else if(state == GL_BACK)
 932                         state = GL_FRONT;
 933         }
 934
 935         if (state != GL_NONE)
 936         {
 937                 if (!gl_state.cullfaceenable)
 938                 {
 939                         gl_state.cullfaceenable = true;
 940                         qglEnable(GL_CULL_FACE);CHECKGLERROR
 941                 }
 942                 if (gl_state.cullface != state)
 943                 {
 944                         gl_state.cullface = state;
 945                         qglCullFace(gl_state.cullface);CHECKGLERROR
 946                 }
 947         }
 948         else
 949         {
 950                 if (gl_state.cullfaceenable)
 951                 {
 952                         gl_state.cullfaceenable = false;
 953                         qglDisable(GL_CULL_FACE);CHECKGLERROR
 954                 }
 955         }
 956 }
 957
 958 void GL_AlphaTest(int state)
 959 {
 960         if (gl_state.alphatest != state)
 961         {
 962                 gl_state.alphatest = state;
 963                 CHECKGLERROR
 964                 if (gl_state.alphatest)
 965                 {
 966                         qglEnable(GL_ALPHA_TEST);CHECKGLERROR
 967                 }
 968                 else
 969                 {
 970                         qglDisable(GL_ALPHA_TEST);CHECKGLERROR
 971                 }
 972         }
 973 }
 974
 975 void GL_ColorMask(int r, int g, int b, int a)
 976 {
 977         int state = r*8 + g*4 + b*2 + a*1;
 978         if (gl_state.colormask != state)
 979         {
 980                 gl_state.colormask = state;
 981                 CHECKGLERROR
 982                 qglColorMask((GLboolean)r, (GLboolean)g, (GLboolean)b, (GLboolean)a);CHECKGLERROR
 983         }
 984 }
 985
 986 void GL_Color(float cr, float cg, float cb, float ca)
 987 {
 988         if (gl_state.pointer_color_enabled || gl_state.color4f[0] != cr || gl_state.color4f[1] != cg || gl_state.color4f[2] != cb || gl_state.color4f[3] != ca)
 989         {
 990                 gl_state.color4f[0] = cr;
 991                 gl_state.color4f[1] = cg;
 992                 gl_state.color4f[2] = cb;
 993                 gl_state.color4f[3] = ca;
 994                 CHECKGLERROR
 995                 qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);
 996                 CHECKGLERROR
 997         }
 998 }
 999
1000 void GL_LockArrays(int first, int count)
1001 {
1002         if (count < gl_lockarrays_minimumvertices.integer)
1003         {
1004                 first = 0;
1005                 count = 0;
1006         }
1007         if (gl_state.lockrange_count != count || gl_state.lockrange_first != first)
1008         {
1009                 if (gl_state.lockrange_count)
1010                 {
1011                         gl_state.lockrange_count = 0;
1012                         CHECKGLERROR
1013                         qglUnlockArraysEXT();
1014                         CHECKGLERROR
1015                 }
1016                 if (count && vid.support.ext_compiled_vertex_array && gl_lockarrays.integer)
1017                 {
1018                         gl_state.lockrange_first = first;
1019                         gl_state.lockrange_count = count;
1020                         CHECKGLERROR
1021                         qglLockArraysEXT(first, count);
1022                         CHECKGLERROR
1023                 }
1024         }
1025 }
1026
1027 void GL_Scissor (int x, int y, int width, int height)
1028 {
1029         CHECKGLERROR
1030         qglScissor(x, y,width,height);
1031         CHECKGLERROR
1032 }
1033
1034 void GL_ScissorTest(int state)
1035 {
1036         if(gl_state.scissortest == state)
1037                 return;
1038
1039         CHECKGLERROR
1040         if((gl_state.scissortest = state))
1041                 qglEnable(GL_SCISSOR_TEST);
1042         else
1043                 qglDisable(GL_SCISSOR_TEST);
1044         CHECKGLERROR
1045 }
1046
1047 void GL_Clear(int mask)
1048 {
1049         CHECKGLERROR
1050         qglClear(mask);CHECKGLERROR
1051 }
1052
1053 // called at beginning of frame
1054 void R_Mesh_Start(void)
1055 {
1056         BACKENDACTIVECHECK
1057         CHECKGLERROR
1058         if (gl_printcheckerror.integer && !gl_paranoid.integer)
1059         {
1060                 Con_Printf("WARNING: gl_printcheckerror is on but gl_paranoid is off, turning it on...\n");
1061                 Cvar_SetValueQuick(&gl_paranoid, 1);
1062         }
1063 }
1064
1065 qboolean GL_Backend_CompileShader(int programobject, GLenum shadertypeenum, const char *shadertype, int numstrings, const char **strings)
1066 {
1067         int shaderobject;
1068         int shadercompiled;
1069         char compilelog[MAX_INPUTLINE];
1070         shaderobject = qglCreateShaderObjectARB(shadertypeenum);CHECKGLERROR
1071         if (!shaderobject)
1072                 return false;
1073         qglShaderSourceARB(shaderobject, numstrings, strings, NULL);CHECKGLERROR
1074         qglCompileShaderARB(shaderobject);CHECKGLERROR
1075         qglGetObjectParameterivARB(shaderobject, GL_OBJECT_COMPILE_STATUS_ARB, &shadercompiled);CHECKGLERROR
1076         qglGetInfoLogARB(shaderobject, sizeof(compilelog), NULL, compilelog);CHECKGLERROR
1077         if (compilelog[0] && developer.integer > 0)
1078         {
1079                 int i, j, pretextlines = 0;
1080                 for (i = 0;i < numstrings - 1;i++)
1081                         for (j = 0;strings[i][j];j++)
1082                                 if (strings[i][j] == '\n')
1083                                         pretextlines++;
1084                 Con_DPrintf("%s shader compile log:\n%s\n(line offset for any above warnings/errors: %i)\n", shadertype, compilelog, pretextlines);
1085         }
1086         if (!shadercompiled)
1087         {
1088                 qglDeleteObjectARB(shaderobject);CHECKGLERROR
1089                 return false;
1090         }
1091         qglAttachObjectARB(programobject, shaderobject);CHECKGLERROR
1092         qglDeleteObjectARB(shaderobject);CHECKGLERROR
1093         return true;
1094 }
1095
1096 unsigned int GL_Backend_CompileProgram(int vertexstrings_count, const char **vertexstrings_list, int geometrystrings_count, const char **geometrystrings_list, int fragmentstrings_count, const char **fragmentstrings_list)
1097 {
1098         GLint programlinked;
1099         GLuint programobject = 0;
1100         char linklog[MAX_INPUTLINE];
1101         CHECKGLERROR
1102
1103         programobject = qglCreateProgramObjectARB();CHECKGLERROR
1104         if (!programobject)
1105                 return 0;
1106
1107         if (vertexstrings_count && !GL_Backend_CompileShader(programobject, GL_VERTEX_SHADER_ARB, "vertex", vertexstrings_count, vertexstrings_list))
1108                 goto cleanup;
1109
1110 #ifdef GL_GEOMETRY_SHADER_ARB
1111         if (geometrystrings_count && !GL_Backend_CompileShader(programobject, GL_GEOMETRY_SHADER_ARB, "geometry", geometrystrings_count, geometrystrings_list))
1112                 goto cleanup;
1113 #endif
1114
1115         if (fragmentstrings_count && !GL_Backend_CompileShader(programobject, GL_FRAGMENT_SHADER_ARB, "fragment", fragmentstrings_count, fragmentstrings_list))
1116                 goto cleanup;
1117
1118         qglLinkProgramARB(programobject);CHECKGLERROR
1119         qglGetObjectParameterivARB(programobject, GL_OBJECT_LINK_STATUS_ARB, &programlinked);CHECKGLERROR
1120         qglGetInfoLogARB(programobject, sizeof(linklog), NULL, linklog);CHECKGLERROR
1121         if (linklog[0])
1122         {
1123                 Con_DPrintf("program link log:\n%s\n", linklog);
1124                 // software vertex shader is ok but software fragment shader is WAY
1125                 // too slow, fail program if so.
1126                 // NOTE: this string might be ATI specific, but that's ok because the
1127                 // ATI R300 chip (Radeon 9500-9800/X300) is the most likely to use a
1128                 // software fragment shader due to low instruction and dependent
1129                 // texture limits.
1130                 if (strstr(linklog, "fragment shader will run in software"))
1131                         programlinked = false;
1132         }
1133         if (!programlinked)
1134                 goto cleanup;
1135         return programobject;
1136 cleanup:
1137         qglDeleteObjectARB(programobject);CHECKGLERROR
1138         return 0;
1139 }
1140
1141 void GL_Backend_FreeProgram(unsigned int prog)
1142 {
1143         CHECKGLERROR
1144         qglDeleteObjectARB(prog);
1145         CHECKGLERROR
1146 }
1147
1148 void GL_Backend_RenumberElements(int *out, int count, const int *in, int offset)
1149 {
1150         int i;
1151         if (offset)
1152         {
1153                 for (i = 0;i < count;i++)
1154                         *out++ = *in++ + offset;
1155         }
1156         else
1157                 memcpy(out, in, sizeof(*out) * count);
1158 }
1159
1160 // renders triangles using vertices from the active arrays
1161 int paranoidblah = 0;
1162 void R_Mesh_Draw(int firstvertex, int numvertices, int firsttriangle, int numtriangles, const int *element3i, const unsigned short *element3s, int bufferobject3i, int bufferobject3s)
1163 {
1164         unsigned int numelements = numtriangles * 3;
1165         if (numvertices < 3 || numtriangles < 1)
1166         {
1167                 if (numvertices < 0 || numtriangles < 0 || developer.integer >= 100)
1168                         Con_Printf("R_Mesh_Draw(%d, %d, %d, %d, %8p, %8p, %i, %i);\n", firstvertex, numvertices, firsttriangle, numtriangles, (void *)element3i, (void *)element3s, bufferobject3i, bufferobject3s);
1169                 return;
1170         }
1171         if (!gl_mesh_prefer_short_elements.integer)
1172         {
1173                 if (element3i)
1174                         element3s = NULL;
1175                 if (bufferobject3i)
1176                         bufferobject3s = 0;
1177         }
1178         if (element3i)
1179                 element3i += firsttriangle * 3;
1180         if (element3s)
1181                 element3s += firsttriangle * 3;
1182         switch (gl_vbo.integer)
1183         {
1184         default:
1185         case 0:
1186         case 2:
1187                 bufferobject3i = bufferobject3s = 0;
1188                 break;
1189         case 1:
1190                 break;
1191         case 3:
1192                 if (firsttriangle)
1193                         bufferobject3i = bufferobject3s = 0;
1194                 break;
1195         }
1196         CHECKGLERROR
1197         r_refdef.stats.meshes++;
1198         r_refdef.stats.meshes_elements += numelements;
1199         if (gl_paranoid.integer)
1200         {
1201                 unsigned int i, j, size;
1202                 const int *p;
1203                 // note: there's no validation done here on buffer objects because it
1204                 // is somewhat difficult to get at the data, and gl_paranoid can be
1205                 // used without buffer objects if the need arises
1206                 // (the data could be gotten using glMapBuffer but it would be very
1207                 //  slow due to uncachable video memory reads)
1208                 if (!qglIsEnabled(GL_VERTEX_ARRAY))
1209                         Con_Print("R_Mesh_Draw: vertex array not enabled\n");
1210                 CHECKGLERROR
1211                 if (gl_state.pointer_vertex)
1212                         for (j = 0, size = numvertices * 3, p = (int *)((float *)gl_state.pointer_vertex + firstvertex * 3);j < size;j++, p++)
1213                                 paranoidblah += *p;
1214                 if (gl_state.pointer_color_enabled)
1215                 {
1216                         if (!qglIsEnabled(GL_COLOR_ARRAY))
1217                                 Con_Print("R_Mesh_Draw: color array set but not enabled\n");
1218                         CHECKGLERROR
1219                         if (gl_state.pointer_color && gl_state.pointer_color_enabled)
1220                                 for (j = 0, size = numvertices * 4, p = (int *)((float *)gl_state.pointer_color + firstvertex * 4);j < size;j++, p++)
1221                                         paranoidblah += *p;
1222                 }
1223                 for (i = 0;i < vid.texarrayunits;i++)
1224                 {
1225                         if (gl_state.units[i].arrayenabled)
1226                         {
1227                                 GL_ClientActiveTexture(i);
1228                                 if (!qglIsEnabled(GL_TEXTURE_COORD_ARRAY))
1229                                         Con_Print("R_Mesh_Draw: texcoord array set but not enabled\n");
1230                                 CHECKGLERROR
1231                                 if (gl_state.units[i].pointer_texcoord && gl_state.units[i].arrayenabled)
1232                                         for (j = 0, size = numvertices * gl_state.units[i].arraycomponents, p = (int *)((float *)gl_state.units[i].pointer_texcoord + firstvertex * gl_state.units[i].arraycomponents);j < size;j++, p++)
1233                                                 paranoidblah += *p;
1234                         }
1235                 }
1236                 if (element3i)
1237                 {
1238                         for (i = 0;i < (unsigned int) numtriangles * 3;i++)
1239                         {
1240                                 if (element3i[i] < firstvertex || element3i[i] >= firstvertex + numvertices)
1241                                 {
1242                                         Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range %i - %i) in element3i array\n", element3i[i], firstvertex, firstvertex + numvertices);
1243                                         return;
1244                                 }
1245                         }
1246                 }
1247                 if (element3s)
1248                 {
1249                         for (i = 0;i < (unsigned int) numtriangles * 3;i++)
1250                         {
1251                                 if (element3s[i] < firstvertex || element3s[i] >= firstvertex + numvertices)
1252                                 {
1253                                         Con_Printf("R_Mesh_Draw: invalid vertex index %i (outside range %i - %i) in element3s array\n", element3s[i], firstvertex, firstvertex + numvertices);
1254                                         return;
1255                                 }
1256                         }
1257                 }
1258                 CHECKGLERROR
1259         }
1260         if (r_render.integer || r_refdef.draw2dstage)
1261         {
1262                 CHECKGLERROR
1263                 if (gl_mesh_testmanualfeeding.integer)
1264                 {
1265                         unsigned int i, j, element;
1266                         const GLfloat *p;
1267                         qglBegin(GL_TRIANGLES);
1268                         for (i = 0;i < (unsigned int) numtriangles * 3;i++)
1269                         {
1270                                 element = element3i ? element3i[i] : element3s[i];
1271                                 for (j = 0;j < vid.texarrayunits;j++)
1272                                 {
1273                                         if (gl_state.units[j].pointer_texcoord && gl_state.units[j].arrayenabled)
1274                                         {
1275                                                 if (vid.texarrayunits > 1)
1276                                                 {
1277                                                         if (gl_state.units[j].arraycomponents == 4)
1278                                                         {
1279                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 4;
1280                                                                 qglMultiTexCoord4f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2], p[3]);
1281                                                         }
1282                                                         else if (gl_state.units[j].arraycomponents == 3)
1283                                                         {
1284                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 3;
1285                                                                 qglMultiTexCoord3f(GL_TEXTURE0_ARB + j, p[0], p[1], p[2]);
1286                                                         }
1287                                                         else if (gl_state.units[j].arraycomponents == 2)
1288                                                         {
1289                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 2;
1290                                                                 qglMultiTexCoord2f(GL_TEXTURE0_ARB + j, p[0], p[1]);
1291                                                         }
1292                                                         else
1293                                                         {
1294                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 1;
1295                                                                 qglMultiTexCoord1f(GL_TEXTURE0_ARB + j, p[0]);
1296                                                         }
1297                                                 }
1298                                                 else
1299                                                 {
1300                                                         if (gl_state.units[j].arraycomponents == 4)
1301                                                         {
1302                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 4;
1303                                                                 qglTexCoord4f(p[0], p[1], p[2], p[3]);
1304                                                         }
1305                                                         else if (gl_state.units[j].arraycomponents == 3)
1306                                                         {
1307                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 3;
1308                                                                 qglTexCoord3f(p[0], p[1], p[2]);
1309                                                         }
1310                                                         else if (gl_state.units[j].arraycomponents == 2)
1311                                                         {
1312                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 2;
1313                                                                 qglTexCoord2f(p[0], p[1]);
1314                                                         }
1315                                                         else
1316                                                         {
1317                                                                 p = ((const GLfloat *)(gl_state.units[j].pointer_texcoord)) + element * 1;
1318                                                                 qglTexCoord1f(p[0]);
1319                                                         }
1320                                                 }
1321                                         }
1322                                 }
1323                                 if (gl_state.pointer_color && gl_state.pointer_color_enabled)
1324                                 {
1325                                         p = ((const GLfloat *)(gl_state.pointer_color)) + element * 4;
1326                                         qglColor4f(p[0], p[1], p[2], p[3]);
1327                                 }
1328                                 p = ((const GLfloat *)(gl_state.pointer_vertex)) + element * 3;
1329                                 qglVertex3f(p[0], p[1], p[2]);
1330                         }
1331                         qglEnd();
1332                         CHECKGLERROR
1333                 }
1334                 else if (gl_mesh_testarrayelement.integer)
1335                 {
1336                         int i;
1337                         qglBegin(GL_TRIANGLES);
1338                         if (element3i)
1339                         {
1340                                 for (i = 0;i < numtriangles * 3;i++)
1341                                         qglArrayElement(element3i[i]);
1342                         }
1343                         else if (element3s)
1344                         {
1345                                 for (i = 0;i < numtriangles * 3;i++)
1346                                         qglArrayElement(element3s[i]);
1347                         }
1348                         qglEnd();
1349                         CHECKGLERROR
1350                 }
1351                 else if (bufferobject3s)
1352                 {
1353                         GL_BindEBO(bufferobject3s);
1354                         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
1355                         {
1356                                 qglDrawRangeElements(GL_TRIANGLES, firstvertex, firstvertex + numvertices - 1, numelements, GL_UNSIGNED_SHORT, (void *)(firsttriangle * sizeof(unsigned short[3])));
1357                                 CHECKGLERROR
1358                         }
1359                         else
1360                         {
1361                                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_SHORT, (void *)(firsttriangle * sizeof(unsigned short[3])));
1362                                 CHECKGLERROR
1363                         }
1364                 }
1365                 else if (bufferobject3i)
1366                 {
1367                         GL_BindEBO(bufferobject3i);
1368                         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
1369                         {
1370                                 qglDrawRangeElements(GL_TRIANGLES, firstvertex, firstvertex + numvertices - 1, numelements, GL_UNSIGNED_INT, (void *)(firsttriangle * sizeof(unsigned int[3])));
1371                                 CHECKGLERROR
1372                         }
1373                         else
1374                         {
1375                                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (void *)(firsttriangle * sizeof(unsigned int[3])));
1376                                 CHECKGLERROR
1377                         }
1378                 }
1379                 else if (element3s)
1380                 {
1381                         GL_BindEBO(0);
1382                         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
1383                         {
1384                                 qglDrawRangeElements(GL_TRIANGLES, firstvertex, firstvertex + numvertices - 1, numelements, GL_UNSIGNED_SHORT, element3s);
1385                                 CHECKGLERROR
1386                         }
1387                         else
1388                         {
1389                                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_SHORT, element3s);
1390                                 CHECKGLERROR
1391                         }
1392                 }
1393                 else if (element3i)
1394                 {
1395                         GL_BindEBO(0);
1396                         if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
1397                         {
1398                                 qglDrawRangeElements(GL_TRIANGLES, firstvertex, firstvertex + numvertices - 1, numelements, GL_UNSIGNED_INT, element3i);
1399                                 CHECKGLERROR
1400                         }
1401                         else
1402                         {
1403                                 qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, element3i);
1404                                 CHECKGLERROR
1405                         }
1406                 }
1407         }
1408 }
1409
1410 // restores backend state, used when done with 3D rendering
1411 void R_Mesh_Finish(void)
1412 {
1413 }
1414
1415 int R_Mesh_CreateStaticBufferObject(unsigned int target, void *data, size_t size, const char *name)
1416 {
1417         gl_bufferobjectinfo_t *info;
1418         GLuint bufferobject;
1419
1420         if (!gl_vbo.integer)
1421                 return 0;
1422
1423         qglGenBuffersARB(1, &bufferobject);
1424         switch(target)
1425         {
1426         case GL_ELEMENT_ARRAY_BUFFER_ARB: GL_BindEBO(bufferobject);break;
1427         case GL_ARRAY_BUFFER_ARB: GL_BindVBO(bufferobject);break;
1428         default: Sys_Error("R_Mesh_CreateStaticBufferObject: unknown target type %i\n", target);return 0;
1429         }
1430         qglBufferDataARB(target, size, data, GL_STATIC_DRAW_ARB);
1431
1432         info = (gl_bufferobjectinfo_t *) Mem_ExpandableArray_AllocRecord(&gl_bufferobjectinfoarray);
1433         memset(info, 0, sizeof(*info));
1434         info->target = target;
1435         info->object = bufferobject;
1436         info->size = size;
1437         strlcpy(info->name, name, sizeof(info->name));
1438
1439         return (int)bufferobject;
1440 }
1441
1442 void R_Mesh_DestroyBufferObject(int bufferobject)
1443 {
1444         int i, endindex;
1445         gl_bufferobjectinfo_t *info;
1446
1447         qglDeleteBuffersARB(1, (GLuint *)&bufferobject);
1448
1449         endindex = Mem_ExpandableArray_IndexRange(&gl_bufferobjectinfoarray);
1450         for (i = 0;i < endindex;i++)
1451         {
1452                 info = (gl_bufferobjectinfo_t *) Mem_ExpandableArray_RecordAtIndex(&gl_bufferobjectinfoarray, i);
1453                 if (!info)
1454                         continue;
1455                 if (info->object == bufferobject)
1456                 {
1457                         Mem_ExpandableArray_FreeRecord(&gl_bufferobjectinfoarray, (void *)info);
1458                         break;
1459                 }
1460         }
1461 }
1462
1463 void GL_Mesh_ListVBOs(qboolean printeach)
1464 {
1465         int i, endindex;
1466         size_t ebocount = 0, ebomemory = 0;
1467         size_t vbocount = 0, vbomemory = 0;
1468         gl_bufferobjectinfo_t *info;
1469         endindex = Mem_ExpandableArray_IndexRange(&gl_bufferobjectinfoarray);
1470         for (i = 0;i < endindex;i++)
1471         {
1472                 info = (gl_bufferobjectinfo_t *) Mem_ExpandableArray_RecordAtIndex(&gl_bufferobjectinfoarray, i);
1473                 if (!info)
1474                         continue;
1475                 switch(info->target)
1476                 {
1477                 case GL_ELEMENT_ARRAY_BUFFER_ARB: ebocount++;ebomemory += info->size;if (printeach) Con_Printf("EBO #%i %s = %i bytes\n", info->object, info->name, (int)info->size);break;
1478                 case GL_ARRAY_BUFFER_ARB: vbocount++;vbomemory += info->size;if (printeach) Con_Printf("VBO #%i %s = %i bytes\n", info->object, info->name, (int)info->size);break;
1479                 default: Con_Printf("gl_vbostats: unknown target type %i\n", info->target);break;
1480                 }
1481         }
1482         Con_Printf("vertex buffers: %i element buffers totalling %i bytes (%.3f MB), %i vertex buffers totalling %i bytes (%.3f MB), combined %i bytes (%.3fMB)\n", (int)ebocount, (int)ebomemory, ebomemory / 1048576.0, (int)vbocount, (int)vbomemory, vbomemory / 1048576.0, (int)(ebomemory + vbomemory), (ebomemory + vbomemory) / 1048576.0);
1483 }
1484
1485 void R_Mesh_Matrix(const matrix4x4_t *matrix)
1486 {
1487         if (memcmp(matrix, &backend_modelmatrix, sizeof(matrix4x4_t)))
1488         {
1489                 float glmatrix[16];
1490                 backend_modelmatrix = *matrix;
1491                 Matrix4x4_Concat(&backend_modelviewmatrix, &backend_viewport.viewmatrix, &backend_modelmatrix);
1492                 Matrix4x4_ToArrayFloatGL(&backend_modelviewmatrix, glmatrix);
1493                 CHECKGLERROR
1494                 qglLoadMatrixf(glmatrix);CHECKGLERROR
1495         }
1496 }
1497
1498 void R_Mesh_VertexPointer(const float *vertex3f, int bufferobject, size_t bufferoffset)
1499 {
1500         if (!gl_vbo.integer || gl_mesh_testarrayelement.integer)
1501                 bufferobject = 0;
1502         if (gl_state.pointer_vertex != vertex3f || gl_state.pointer_vertex_buffer != bufferobject || gl_state.pointer_vertex_offset != bufferoffset)
1503         {
1504                 gl_state.pointer_vertex = vertex3f;
1505                 gl_state.pointer_vertex_buffer = bufferobject;
1506                 gl_state.pointer_vertex_offset = bufferoffset;
1507                 CHECKGLERROR
1508                 GL_BindVBO(bufferobject);
1509                 qglVertexPointer(3, GL_FLOAT, sizeof(float[3]), bufferobject ? (void *)bufferoffset : vertex3f);CHECKGLERROR
1510         }
1511 }
1512
1513 void R_Mesh_ColorPointer(const float *color4f, int bufferobject, size_t bufferoffset)
1514 {
1515         // note: this can not rely on bufferobject to decide whether a color array
1516         // is supplied, because surfmesh_t shares one vbo for all arrays, which
1517         // means that a valid vbo may be supplied even if there is no color array.
1518         if (color4f)
1519         {
1520                 if (!gl_vbo.integer || gl_mesh_testarrayelement.integer)
1521                         bufferobject = 0;
1522                 // caller wants color array enabled
1523                 if (!gl_state.pointer_color_enabled)
1524                 {
1525                         gl_state.pointer_color_enabled = true;
1526                         CHECKGLERROR
1527                         qglEnableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1528                 }
1529                 if (gl_state.pointer_color != color4f || gl_state.pointer_color_buffer != bufferobject || gl_state.pointer_color_offset != bufferoffset)
1530                 {
1531                         gl_state.pointer_color = color4f;
1532                         gl_state.pointer_color_buffer = bufferobject;
1533                         gl_state.pointer_color_offset = bufferoffset;
1534                         CHECKGLERROR
1535                         GL_BindVBO(bufferobject);
1536                         qglColorPointer(4, GL_FLOAT, sizeof(float[4]), bufferobject ? (void *)bufferoffset : color4f);CHECKGLERROR
1537                 }
1538         }
1539         else
1540         {
1541                 // caller wants color array disabled
1542                 if (gl_state.pointer_color_enabled)
1543                 {
1544                         gl_state.pointer_color_enabled = false;
1545                         CHECKGLERROR
1546                         qglDisableClientState(GL_COLOR_ARRAY);CHECKGLERROR
1547                         // when color array is on the glColor gets trashed, set it again
1548                         qglColor4f(gl_state.color4f[0], gl_state.color4f[1], gl_state.color4f[2], gl_state.color4f[3]);CHECKGLERROR
1549                 }
1550         }
1551 }
1552
1553 void R_Mesh_TexCoordPointer(unsigned int unitnum, unsigned int numcomponents, const float *texcoord, int bufferobject, size_t bufferoffset)
1554 {
1555         gltextureunit_t *unit = gl_state.units + unitnum;
1556         // update array settings
1557         CHECKGLERROR
1558         // note: there is no need to check bufferobject here because all cases
1559         // that involve a valid bufferobject also supply a texcoord array
1560         if (texcoord)
1561         {
1562                 if (!gl_vbo.integer || gl_mesh_testarrayelement.integer)
1563                         bufferobject = 0;
1564                 // texture array unit is enabled, enable the array
1565                 if (!unit->arrayenabled)
1566                 {
1567                         unit->arrayenabled = true;
1568                         GL_ClientActiveTexture(unitnum);
1569                         qglEnableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1570                 }
1571                 // texcoord array
1572                 if (unit->pointer_texcoord != texcoord || unit->pointer_texcoord_buffer != bufferobject || unit->pointer_texcoord_offset != bufferoffset || unit->arraycomponents != numcomponents)
1573                 {
1574                         unit->pointer_texcoord = texcoord;
1575                         unit->pointer_texcoord_buffer = bufferobject;
1576                         unit->pointer_texcoord_offset = bufferoffset;
1577                         unit->arraycomponents = numcomponents;
1578                         GL_ClientActiveTexture(unitnum);
1579                         GL_BindVBO(bufferobject);
1580                         qglTexCoordPointer(unit->arraycomponents, GL_FLOAT, sizeof(float) * unit->arraycomponents, bufferobject ? (void *)bufferoffset : texcoord);CHECKGLERROR
1581                 }
1582         }
1583         else
1584         {
1585                 // texture array unit is disabled, disable the array
1586                 if (unit->arrayenabled)
1587                 {
1588                         unit->arrayenabled = false;
1589                         GL_ClientActiveTexture(unitnum);
1590                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1591                 }
1592         }
1593 }
1594
1595 void R_Mesh_TexBindAll(unsigned int unitnum, int tex2d, int tex3d, int texcubemap, int texrectangle)
1596 {
1597         gltextureunit_t *unit = gl_state.units + unitnum;
1598         if (unitnum >= vid.teximageunits)
1599                 return;
1600         // update 2d texture binding
1601         if (unit->t2d != tex2d)
1602         {
1603                 GL_ActiveTexture(unitnum);
1604                 if (unitnum < vid.texunits)
1605                 {
1606                         if (tex2d)
1607                         {
1608                                 if (unit->t2d == 0)
1609                                 {
1610                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
1611                                 }
1612                         }
1613                         else
1614                         {
1615                                 if (unit->t2d)
1616                                 {
1617                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1618                                 }
1619                         }
1620                 }
1621                 unit->t2d = tex2d;
1622                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1623         }
1624         // update 3d texture binding
1625         if (unit->t3d != tex3d)
1626         {
1627                 GL_ActiveTexture(unitnum);
1628                 if (unitnum < vid.texunits)
1629                 {
1630                         if (tex3d)
1631                         {
1632                                 if (unit->t3d == 0)
1633                                 {
1634                                         qglEnable(GL_TEXTURE_3D);CHECKGLERROR
1635                                 }
1636                         }
1637                         else
1638                         {
1639                                 if (unit->t3d)
1640                                 {
1641                                         qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1642                                 }
1643                         }
1644                 }
1645                 unit->t3d = tex3d;
1646                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1647         }
1648         // update cubemap texture binding
1649         if (unit->tcubemap != texcubemap)
1650         {
1651                 GL_ActiveTexture(unitnum);
1652                 if (unitnum < vid.texunits)
1653                 {
1654                         if (texcubemap)
1655                         {
1656                                 if (unit->tcubemap == 0)
1657                                 {
1658                                         qglEnable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1659                                 }
1660                         }
1661                         else
1662                         {
1663                                 if (unit->tcubemap)
1664                                 {
1665                                         qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1666                                 }
1667                         }
1668                 }
1669                 unit->tcubemap = texcubemap;
1670                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1671         }
1672         // update rectangle texture binding
1673         if (unit->trectangle != texrectangle)
1674         {
1675                 GL_ActiveTexture(unitnum);
1676                 if (unitnum < vid.texunits)
1677                 {
1678                         if (texrectangle)
1679                         {
1680                                 if (unit->trectangle == 0)
1681                                 {
1682                                         qglEnable(GL_TEXTURE_RECTANGLE_ARB);CHECKGLERROR
1683                                 }
1684                         }
1685                         else
1686                         {
1687                                 if (unit->trectangle)
1688                                 {
1689                                         qglDisable(GL_TEXTURE_RECTANGLE_ARB);CHECKGLERROR
1690                                 }
1691                         }
1692                 }
1693                 unit->trectangle = texrectangle;
1694                 qglBindTexture(GL_TEXTURE_RECTANGLE_ARB, unit->trectangle);CHECKGLERROR
1695         }
1696 }
1697
1698 void R_Mesh_TexBind(unsigned int unitnum, int texnum)
1699 {
1700         gltextureunit_t *unit = gl_state.units + unitnum;
1701         if (unitnum >= vid.teximageunits)
1702                 return;
1703         // update 2d texture binding
1704         if (unit->t2d != texnum)
1705         {
1706                 GL_ActiveTexture(unitnum);
1707                 if (unitnum < vid.texunits)
1708                 {
1709                         if (texnum)
1710                         {
1711                                 if (unit->t2d == 0)
1712                                 {
1713                                         qglEnable(GL_TEXTURE_2D);CHECKGLERROR
1714                                 }
1715                         }
1716                         else
1717                         {
1718                                 if (unit->t2d)
1719                                 {
1720                                         qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1721                                 }
1722                         }
1723                 }
1724                 unit->t2d = texnum;
1725                 qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1726         }
1727         // update 3d texture binding
1728         if (unit->t3d)
1729         {
1730                 GL_ActiveTexture(unitnum);
1731                 if (unitnum < vid.texunits)
1732                 {
1733                         if (unit->t3d)
1734                         {
1735                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1736                         }
1737                 }
1738                 unit->t3d = 0;
1739                 qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1740         }
1741         // update cubemap texture binding
1742         if (unit->tcubemap != 0)
1743         {
1744                 GL_ActiveTexture(unitnum);
1745                 if (unitnum < vid.texunits)
1746                 {
1747                         if (unit->tcubemap)
1748                         {
1749                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1750                         }
1751                 }
1752                 unit->tcubemap = 0;
1753                 qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1754         }
1755         // update rectangle texture binding
1756         if (unit->trectangle != 0)
1757         {
1758                 GL_ActiveTexture(unitnum);
1759                 if (unitnum < vid.texunits)
1760                 {
1761                         if (unit->trectangle)
1762                         {
1763                                 qglDisable(GL_TEXTURE_RECTANGLE_ARB);CHECKGLERROR
1764                         }
1765                 }
1766                 unit->trectangle = 0;
1767                 qglBindTexture(GL_TEXTURE_RECTANGLE_ARB, unit->trectangle);CHECKGLERROR
1768         }
1769 }
1770
1771 static const float gl_identitymatrix[16] = {1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1};
1772
1773 void R_Mesh_TexMatrix(unsigned int unitnum, const matrix4x4_t *matrix)
1774 {
1775         gltextureunit_t *unit = gl_state.units + unitnum;
1776         if (matrix->m[3][3])
1777         {
1778                 // texmatrix specified, check if it is different
1779                 if (!unit->texmatrixenabled || memcmp(&unit->matrix, matrix, sizeof(matrix4x4_t)))
1780                 {
1781                         float glmatrix[16];
1782                         unit->texmatrixenabled = true;
1783                         unit->matrix = *matrix;
1784                         CHECKGLERROR
1785                         Matrix4x4_ToArrayFloatGL(&unit->matrix, glmatrix);
1786                         GL_ActiveTexture(unitnum);
1787                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
1788                         qglLoadMatrixf(glmatrix);CHECKGLERROR
1789                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
1790                 }
1791         }
1792         else
1793         {
1794                 // no texmatrix specified, revert to identity
1795                 if (unit->texmatrixenabled)
1796                 {
1797                         unit->texmatrixenabled = false;
1798                         unit->matrix = identitymatrix;
1799                         CHECKGLERROR
1800                         GL_ActiveTexture(unitnum);
1801                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
1802                         qglLoadIdentity();CHECKGLERROR
1803                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
1804                 }
1805         }
1806 }
1807
1808 void R_Mesh_TexCombine(unsigned int unitnum, int combinergb, int combinealpha, int rgbscale, int alphascale)
1809 {
1810         gltextureunit_t *unit = gl_state.units + unitnum;
1811         CHECKGLERROR
1812         if (gl_combine.integer)
1813         {
1814                 // GL_ARB_texture_env_combine
1815                 if (!combinergb)
1816                         combinergb = GL_MODULATE;
1817                 if (!combinealpha)
1818                         combinealpha = GL_MODULATE;
1819                 if (!rgbscale)
1820                         rgbscale = 1;
1821                 if (!alphascale)
1822                         alphascale = 1;
1823                 if (unit->combinergb != combinergb)
1824                 {
1825                         unit->combinergb = combinergb;
1826                         GL_ActiveTexture(unitnum);
1827                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
1828                 }
1829                 if (unit->combinealpha != combinealpha)
1830                 {
1831                         unit->combinealpha = combinealpha;
1832                         GL_ActiveTexture(unitnum);
1833                         qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1834                 }
1835                 if (unit->rgbscale != rgbscale)
1836                 {
1837                         GL_ActiveTexture(unitnum);
1838                         qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = rgbscale));CHECKGLERROR
1839                 }
1840                 if (unit->alphascale != alphascale)
1841                 {
1842                         GL_ActiveTexture(unitnum);
1843                         qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = alphascale));CHECKGLERROR
1844                 }
1845         }
1846         else
1847         {
1848                 // normal GL texenv
1849                 if (!combinergb)
1850                         combinergb = GL_MODULATE;
1851                 if (unit->combinergb != combinergb)
1852                 {
1853                         unit->combinergb = combinergb;
1854                         GL_ActiveTexture(unitnum);
1855                         qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
1856                 }
1857         }
1858 }
1859
1860 void R_Mesh_TextureState(const rmeshstate_t *m)
1861 {
1862         unsigned int i;
1863
1864         BACKENDACTIVECHECK
1865
1866         CHECKGLERROR
1867         for (i = 0;i < vid.teximageunits;i++)
1868                 R_Mesh_TexBindAll(i, m->tex[i], m->tex3d[i], m->texcubemap[i], m->texrectangle[i]);
1869         for (i = 0;i < vid.texarrayunits;i++)
1870         {
1871                 if (m->pointer_texcoord3f[i])
1872                         R_Mesh_TexCoordPointer(i, 3, m->pointer_texcoord3f[i], m->pointer_texcoord_bufferobject[i], m->pointer_texcoord_bufferoffset[i]);
1873                 else
1874                         R_Mesh_TexCoordPointer(i, 2, m->pointer_texcoord[i], m->pointer_texcoord_bufferobject[i], m->pointer_texcoord_bufferoffset[i]);
1875         }
1876         for (i = 0;i < vid.texunits;i++)
1877         {
1878                 R_Mesh_TexMatrix(i, &m->texmatrix[i]);
1879                 R_Mesh_TexCombine(i, m->texcombinergb[i], m->texcombinealpha[i], m->texrgbscale[i], m->texalphascale[i]);
1880         }
1881         CHECKGLERROR
1882 }
1883
1884 void R_Mesh_ResetTextureState(void)
1885 {
1886         unsigned int unitnum;
1887
1888         BACKENDACTIVECHECK
1889
1890         CHECKGLERROR
1891         for (unitnum = 0;unitnum < vid.teximageunits;unitnum++)
1892         {
1893                 gltextureunit_t *unit = gl_state.units + unitnum;
1894                 // update 2d texture binding
1895                 if (unit->t2d)
1896                 {
1897                         GL_ActiveTexture(unitnum);
1898                         if (unitnum < vid.texunits)
1899                         {
1900                                 qglDisable(GL_TEXTURE_2D);CHECKGLERROR
1901                         }
1902                         unit->t2d = 0;
1903                         qglBindTexture(GL_TEXTURE_2D, unit->t2d);CHECKGLERROR
1904                 }
1905                 // update 3d texture binding
1906                 if (unit->t3d)
1907                 {
1908                         GL_ActiveTexture(unitnum);
1909                         if (unitnum < vid.texunits)
1910                         {
1911                                 qglDisable(GL_TEXTURE_3D);CHECKGLERROR
1912                         }
1913                         unit->t3d = 0;
1914                         qglBindTexture(GL_TEXTURE_3D, unit->t3d);CHECKGLERROR
1915                 }
1916                 // update cubemap texture binding
1917                 if (unit->tcubemap)
1918                 {
1919                         GL_ActiveTexture(unitnum);
1920                         if (unitnum < vid.texunits)
1921                         {
1922                                 qglDisable(GL_TEXTURE_CUBE_MAP_ARB);CHECKGLERROR
1923                         }
1924                         unit->tcubemap = 0;
1925                         qglBindTexture(GL_TEXTURE_CUBE_MAP_ARB, unit->tcubemap);CHECKGLERROR
1926                 }
1927                 // update rectangle texture binding
1928                 if (unit->trectangle)
1929                 {
1930                         GL_ActiveTexture(unitnum);
1931                         if (unitnum < vid.texunits)
1932                         {
1933                                 qglDisable(GL_TEXTURE_RECTANGLE_ARB);CHECKGLERROR
1934                         }
1935                         unit->trectangle = 0;
1936                         qglBindTexture(GL_TEXTURE_RECTANGLE_ARB, unit->trectangle);CHECKGLERROR
1937                 }
1938         }
1939         for (unitnum = 0;unitnum < vid.texarrayunits;unitnum++)
1940         {
1941                 gltextureunit_t *unit = gl_state.units + unitnum;
1942                 // texture array unit is disabled, disable the array
1943                 if (unit->arrayenabled)
1944                 {
1945                         unit->arrayenabled = false;
1946                         GL_ClientActiveTexture(unitnum);
1947                         qglDisableClientState(GL_TEXTURE_COORD_ARRAY);CHECKGLERROR
1948                 }
1949         }
1950         for (unitnum = 0;unitnum < vid.texunits;unitnum++)
1951         {
1952                 gltextureunit_t *unit = gl_state.units + unitnum;
1953                 // no texmatrix specified, revert to identity
1954                 if (unit->texmatrixenabled)
1955                 {
1956                         unit->texmatrixenabled = false;
1957                         unit->matrix = identitymatrix;
1958                         CHECKGLERROR
1959                         GL_ActiveTexture(unitnum);
1960                         qglMatrixMode(GL_TEXTURE);CHECKGLERROR
1961                         qglLoadIdentity();CHECKGLERROR
1962                         qglMatrixMode(GL_MODELVIEW);CHECKGLERROR
1963                 }
1964                 if (gl_combine.integer)
1965                 {
1966                         // GL_ARB_texture_env_combine
1967                         if (unit->combinergb != GL_MODULATE)
1968                         {
1969                                 unit->combinergb = GL_MODULATE;
1970                                 GL_ActiveTexture(unitnum);
1971                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, unit->combinergb);CHECKGLERROR
1972                         }
1973                         if (unit->combinealpha != GL_MODULATE)
1974                         {
1975                                 unit->combinealpha = GL_MODULATE;
1976                                 GL_ActiveTexture(unitnum);
1977                                 qglTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, unit->combinealpha);CHECKGLERROR
1978                         }
1979                         if (unit->rgbscale != 1)
1980                         {
1981                                 GL_ActiveTexture(unitnum);
1982                                 qglTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, (unit->rgbscale = 1));CHECKGLERROR
1983                         }
1984                         if (unit->alphascale != 1)
1985                         {
1986                                 GL_ActiveTexture(unitnum);
1987                                 qglTexEnvi(GL_TEXTURE_ENV, GL_ALPHA_SCALE, (unit->alphascale = 1));CHECKGLERROR
1988                         }
1989                 }
1990                 else
1991                 {
1992                         // normal GL texenv
1993                         if (unit->combinergb != GL_MODULATE)
1994                         {
1995                                 unit->combinergb = GL_MODULATE;
1996                                 GL_ActiveTexture(unitnum);
1997                                 qglTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, unit->combinergb);CHECKGLERROR
1998                         }
1999                 }
2000         }
2001 }