dlls/wined3d/gl_compat.c

   1 /*
   2  * Compatibility functions for older GL implementations
   3  *
   4  * Copyright 2008 Stefan Dösinger for CodeWeavers
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdio.h>
  25 #ifdef HAVE_FLOAT_H
  26 # include <float.h>
  27 #endif
  28
  29 #include "wined3d_private.h"
  30
  31 WINE_DEFAULT_DEBUG_CHANNEL(gl_compat);
  32 WINE_DECLARE_DEBUG_CHANNEL(d3d_perf);
  33
  34 /* Start GL_ARB_multitexture emulation */
  35 static void WINE_GLAPI wine_glMultiTexCoord1fARB(GLenum target, GLfloat s) {
  36     if(target != GL_TEXTURE0) {
  37         ERR("Texture unit > 0 used, but GL_ARB_multitexture is not supported\n");
  38         return;
  39     }
  40     context_get_current()->gl_info->gl_ops.gl.p_glTexCoord1f(s);
  41 }
  42
  43 static void WINE_GLAPI wine_glMultiTexCoord1fvARB(GLenum target, const GLfloat *v) {
  44     if(target != GL_TEXTURE0) {
  45         ERR("Texture unit > 0 used, but GL_ARB_multitexture is not supported\n");
  46         return;
  47     }
  48     context_get_current()->gl_info->gl_ops.gl.p_glTexCoord1fv(v);
  49 }
  50
  51 static void WINE_GLAPI wine_glMultiTexCoord2fARB(GLenum target, GLfloat s, GLfloat t) {
  52     if(target != GL_TEXTURE0) {
  53         ERR("Texture unit > 0 used, but GL_ARB_multitexture is not supported\n");
  54         return;
  55     }
  56     context_get_current()->gl_info->gl_ops.gl.p_glTexCoord2f(s, t);
  57 }
  58
  59 static void WINE_GLAPI wine_glMultiTexCoord2fvARB(GLenum target, const GLfloat *v) {
  60     if(target != GL_TEXTURE0) {
  61         ERR("Texture unit > 0 used, but GL_ARB_multitexture is not supported\n");
  62         return;
  63     }
  64     context_get_current()->gl_info->gl_ops.gl.p_glTexCoord2fv(v);
  65 }
  66
  67 static void WINE_GLAPI wine_glMultiTexCoord3fARB(GLenum target, GLfloat s, GLfloat t, GLfloat r) {
  68     if(target != GL_TEXTURE0) {
  69         ERR("Texture unit > 0 used, but GL_ARB_multitexture is not supported\n");
  70         return;
  71     }
  72     context_get_current()->gl_info->gl_ops.gl.p_glTexCoord3f(s, t, r);
  73 }
  74
  75 static void WINE_GLAPI wine_glMultiTexCoord3fvARB(GLenum target, const GLfloat *v) {
  76     if(target != GL_TEXTURE0) {
  77         ERR("Texture unit > 0 used, but GL_ARB_multitexture is not supported\n");
  78         return;
  79     }
  80     context_get_current()->gl_info->gl_ops.gl.p_glTexCoord3fv(v);
  81 }
  82
  83 static void WINE_GLAPI wine_glMultiTexCoord4fARB(GLenum target, GLfloat s, GLfloat t, GLfloat r, GLfloat q) {
  84     if(target != GL_TEXTURE0) {
  85         ERR("Texture unit > 0 used, but GL_ARB_multitexture is not supported\n");
  86         return;
  87     }
  88     context_get_current()->gl_info->gl_ops.gl.p_glTexCoord4f(s, t, r, q);
  89 }
  90
  91 static void WINE_GLAPI wine_glMultiTexCoord4fvARB(GLenum target, const GLfloat *v) {
  92     if(target != GL_TEXTURE0) {
  93         ERR("Texture unit > 0 used, but GL_ARB_multitexture is not supported\n");
  94         return;
  95     }
  96     context_get_current()->gl_info->gl_ops.gl.p_glTexCoord4fv(v);
  97 }
  98
  99 static void WINE_GLAPI wine_glMultiTexCoord2svARB(GLenum target, const GLshort *v) {
 100     if(target != GL_TEXTURE0) {
 101         ERR("Texture unit > 0 used, but GL_ARB_multitexture is not supported\n");
 102         return;
 103     }
 104     context_get_current()->gl_info->gl_ops.gl.p_glTexCoord2sv(v);
 105 }
 106
 107 static void WINE_GLAPI wine_glMultiTexCoord4svARB(GLenum target, const GLshort *v) {
 108     if(target != GL_TEXTURE0) {
 109         ERR("Texture unit > 0 used, but GL_ARB_multitexture is not supported\n");
 110         return;
 111     }
 112     context_get_current()->gl_info->gl_ops.gl.p_glTexCoord4sv(v);
 113 }
 114
 115 static void WINE_GLAPI wine_glActiveTexture(GLenum texture)
 116 {
 117     if(texture != GL_TEXTURE0) {
 118         ERR("Texture unit > 0 used, but GL_ARB_multitexture is not supported\n");
 119         return;
 120     }
 121 }
 122
 123 static void WINE_GLAPI wine_glClientActiveTextureARB(GLenum texture) {
 124     if(texture != GL_TEXTURE0) {
 125         ERR("Texture unit > 0 used, but GL_ARB_multitexture is not supported\n");
 126         return;
 127     }
 128 }
 129
 130 static void (WINE_GLAPI *old_multitex_glGetIntegerv) (GLenum pname, GLint* params) = NULL;
 131 static void WINE_GLAPI wine_glGetIntegerv(GLenum pname, GLint* params) {
 132     switch(pname) {
 133         case GL_ACTIVE_TEXTURE:         *params = 0;    break;
 134         case GL_MAX_TEXTURE_UNITS_ARB:  *params = 1;    break;
 135         default: old_multitex_glGetIntegerv(pname, params);
 136     }
 137 }
 138
 139 static void (WINE_GLAPI *old_multitex_glGetFloatv) (GLenum pname, GLfloat* params) = NULL;
 140 static void WINE_GLAPI wine_glGetFloatv(GLenum pname, GLfloat* params) {
 141     if (pname == GL_ACTIVE_TEXTURE) *params = 0.0f;
 142     else old_multitex_glGetFloatv(pname, params);
 143 }
 144
 145 static void (WINE_GLAPI *old_multitex_glGetDoublev) (GLenum pname, GLdouble* params) = NULL;
 146 static void WINE_GLAPI wine_glGetDoublev(GLenum pname, GLdouble* params) {
 147     if(pname == GL_ACTIVE_TEXTURE) *params = 0.0;
 148     else old_multitex_glGetDoublev(pname, params);
 149 }
 150
 151 /* Start GL_EXT_fogcoord emulation */
 152 static void (WINE_GLAPI *old_fogcoord_glEnable) (GLenum cap) = NULL;
 153 static void WINE_GLAPI wine_glEnable(GLenum cap) {
 154     if(cap == GL_FOG) {
 155         struct wined3d_context *ctx = context_get_current();
 156         ctx->fog_enabled = 1;
 157         if(ctx->gl_fog_source != GL_FRAGMENT_DEPTH_EXT) return;
 158     }
 159     old_fogcoord_glEnable(cap);
 160 }
 161
 162 static void (WINE_GLAPI *old_fogcoord_glDisable) (GLenum cap) = NULL;
 163 static void WINE_GLAPI wine_glDisable(GLenum cap) {
 164     if(cap == GL_FOG) {
 165         struct wined3d_context *ctx = context_get_current();
 166         ctx->fog_enabled = 0;
 167         if(ctx->gl_fog_source != GL_FRAGMENT_DEPTH_EXT) return;
 168     }
 169     old_fogcoord_glDisable(cap);
 170 }
 171
 172 static void (WINE_GLAPI *old_fogcoord_glFogi) (GLenum pname, GLint param) = NULL;
 173 static void WINE_GLAPI wine_glFogi(GLenum pname, GLint param) {
 174     struct wined3d_context *ctx = context_get_current();
 175
 176     if(pname == GL_FOG_COORDINATE_SOURCE_EXT) {
 177         ctx->gl_fog_source = param;
 178         if(param == GL_FRAGMENT_DEPTH_EXT) {
 179             if(ctx->fog_enabled) old_fogcoord_glEnable(GL_FOG);
 180         } else {
 181             WARN_(d3d_perf)("Fog coords activated, but not supported. Using slow emulation\n");
 182             old_fogcoord_glDisable(GL_FOG);
 183         }
 184     } else {
 185         if(pname == GL_FOG_START) {
 186             ctx->fogstart = (float) param;
 187         } else if(pname == GL_FOG_END) {
 188             ctx->fogend = (float) param;
 189         }
 190         old_fogcoord_glFogi(pname, param);
 191     }
 192 }
 193
 194 static void (WINE_GLAPI *old_fogcoord_glFogiv) (GLenum pname, const GLint *param) = NULL;
 195 static void WINE_GLAPI wine_glFogiv(GLenum pname, const GLint *param) {
 196     struct wined3d_context *ctx = context_get_current();
 197     if(pname == GL_FOG_COORDINATE_SOURCE_EXT) {
 198         ctx->gl_fog_source = *param;
 199         if(*param == GL_FRAGMENT_DEPTH_EXT) {
 200             if(ctx->fog_enabled) old_fogcoord_glEnable(GL_FOG);
 201         } else {
 202             WARN_(d3d_perf)("Fog coords activated, but not supported. Using slow emulation\n");
 203             old_fogcoord_glDisable(GL_FOG);
 204         }
 205     } else {
 206         if(pname == GL_FOG_START) {
 207             ctx->fogstart = (float) *param;
 208         } else if(pname == GL_FOG_END) {
 209             ctx->fogend = (float) *param;
 210         }
 211         old_fogcoord_glFogiv(pname, param);
 212     }
 213 }
 214
 215 static void (WINE_GLAPI *old_fogcoord_glFogf) (GLenum pname, GLfloat param) = NULL;
 216 static void WINE_GLAPI wine_glFogf(GLenum pname, GLfloat param) {
 217     struct wined3d_context *ctx = context_get_current();
 218     if(pname == GL_FOG_COORDINATE_SOURCE_EXT) {
 219         ctx->gl_fog_source = (GLint) param;
 220         if(param == GL_FRAGMENT_DEPTH_EXT) {
 221             if(ctx->fog_enabled) old_fogcoord_glEnable(GL_FOG);
 222         } else {
 223             WARN_(d3d_perf)("Fog coords activated, but not supported. Using slow emulation\n");
 224             old_fogcoord_glDisable(GL_FOG);
 225         }
 226     } else {
 227         if(pname == GL_FOG_START) {
 228             ctx->fogstart = param;
 229         } else if(pname == GL_FOG_END) {
 230             ctx->fogend = param;
 231         }
 232         old_fogcoord_glFogf(pname, param);
 233     }
 234 }
 235
 236 static void (WINE_GLAPI *old_fogcoord_glFogfv) (GLenum pname, const GLfloat *param) = NULL;
 237 static void WINE_GLAPI wine_glFogfv(GLenum pname, const GLfloat *param) {
 238     struct wined3d_context *ctx = context_get_current();
 239     if(pname == GL_FOG_COORDINATE_SOURCE_EXT) {
 240         ctx->gl_fog_source = (GLint) *param;
 241         if(*param == GL_FRAGMENT_DEPTH_EXT) {
 242             if(ctx->fog_enabled) old_fogcoord_glEnable(GL_FOG);
 243         } else {
 244             WARN_(d3d_perf)("Fog coords activated, but not supported. Using slow emulation\n");
 245             old_fogcoord_glDisable(GL_FOG);
 246         }
 247     } else {
 248         if(pname == GL_FOG_COLOR) {
 249             ctx->fogcolor[0] = param[0];
 250             ctx->fogcolor[1] = param[1];
 251             ctx->fogcolor[2] = param[2];
 252             ctx->fogcolor[3] = param[3];
 253         } else if(pname == GL_FOG_START) {
 254             ctx->fogstart = *param;
 255         } else if(pname == GL_FOG_END) {
 256             ctx->fogend = *param;
 257         }
 258         old_fogcoord_glFogfv(pname, param);
 259     }
 260 }
 261
 262 static void (WINE_GLAPI *old_fogcoord_glVertex4f) (GLfloat x, GLfloat y, GLfloat z, GLfloat w) = NULL;
 263 static void (WINE_GLAPI *old_fogcoord_glColor4f) (GLfloat r, GLfloat g, GLfloat b, GLfloat a) = NULL;
 264
 265 static void WINE_GLAPI wine_glVertex4f(GLfloat x, GLfloat y, GLfloat z, GLfloat w) {
 266     struct wined3d_context *ctx = context_get_current();
 267
 268     /* This can be called from draw_test_quad() and at that point there is no
 269      * wined3d_context current. */
 270     if (!ctx)
 271     {
 272         old_fogcoord_glVertex4f(x, y, z, w);
 273         return;
 274     }
 275     if(ctx->gl_fog_source == GL_FOG_COORDINATE_EXT && ctx->fog_enabled) {
 276         GLfloat c[4] = {ctx->color[0], ctx->color[1], ctx->color[2], ctx->color[3]};
 277         GLfloat i;
 278
 279         i = (ctx->fogend - ctx->fog_coord_value) / (ctx->fogend - ctx->fogstart);
 280         c[0] = i * c[0] + (1.0f - i) * ctx->fogcolor[0];
 281         c[1] = i * c[1] + (1.0f - i) * ctx->fogcolor[1];
 282         c[2] = i * c[2] + (1.0f - i) * ctx->fogcolor[2];
 283
 284         old_fogcoord_glColor4f(c[0], c[1], c[2], c[3]);
 285         old_fogcoord_glVertex4f(x, y, z, w);
 286     } else {
 287         old_fogcoord_glVertex4f(x, y, z, w);
 288     }
 289 }
 290
 291 static void WINE_GLAPI wine_glVertex4fv(const GLfloat *pos) {
 292     wine_glVertex4f(pos[0], pos[1], pos[2], pos[3]);
 293 }
 294
 295 static void WINE_GLAPI wine_glVertex3f(GLfloat x, GLfloat y, GLfloat z) {
 296     wine_glVertex4f(x, y, z, 1.0f);
 297 }
 298
 299 static void WINE_GLAPI wine_glVertex3fv(const GLfloat *pos) {
 300     wine_glVertex4f(pos[0], pos[1], pos[2], 1.0f);
 301 }
 302
 303 static void WINE_GLAPI wine_glColor4f(GLfloat r, GLfloat g, GLfloat b, GLfloat a) {
 304     struct wined3d_context *ctx = context_get_current();
 305
 306     /* This can be called from draw_test_quad() and at that point there is no
 307      * wined3d_context current. */
 308     if (!ctx)
 309     {
 310         old_fogcoord_glColor4f(r, g, b, a);
 311         return;
 312     }
 313     ctx->color[0] = r;
 314     ctx->color[1] = g;
 315     ctx->color[2] = b;
 316     ctx->color[3] = a;
 317     old_fogcoord_glColor4f(r, g, b, a);
 318 }
 319
 320 static void WINE_GLAPI wine_glColor4fv(const GLfloat *c) {
 321     wine_glColor4f(c[0], c[1], c[2], c[3]);
 322 }
 323
 324 static void WINE_GLAPI wine_glColor3f(GLfloat r, GLfloat g, GLfloat b) {
 325     wine_glColor4f(r, g, b, 1.0f);
 326 }
 327
 328 static void WINE_GLAPI wine_glColor3fv(const GLfloat *c) {
 329     wine_glColor4f(c[0], c[1], c[2], 1.0f);
 330 }
 331
 332 static void WINE_GLAPI wine_glColor4ub(GLubyte r, GLubyte g, GLubyte b, GLubyte a) {
 333     wine_glColor4f(r / 255.0f, g / 255.0f, b / 255.0f, a / 255.0f);
 334 }
 335
 336 /* In D3D the fog coord is a UBYTE, so there's no problem with using the single
 337  * precision function
 338  */
 339 static void WINE_GLAPI wine_glFogCoordfEXT(GLfloat f) {
 340     struct wined3d_context *ctx = context_get_current();
 341     ctx->fog_coord_value = f;
 342 }
 343 static void WINE_GLAPI wine_glFogCoorddEXT(GLdouble f) {
 344     wine_glFogCoordfEXT((GLfloat) f);
 345 }
 346 static void WINE_GLAPI wine_glFogCoordfvEXT(const GLfloat *f) {
 347     wine_glFogCoordfEXT(*f);
 348 }
 349 static void WINE_GLAPI wine_glFogCoorddvEXT(const GLdouble *f) {
 350     wine_glFogCoordfEXT((GLfloat) *f);
 351 }
 352
 353 /* End GL_EXT_fog_coord emulation */
 354
 355 void install_gl_compat_wrapper(struct wined3d_gl_info *gl_info, enum wined3d_gl_extension ext)
 356 {
 357     switch (ext)
 358     {
 359         case ARB_MULTITEXTURE:
 360             if (gl_info->supported[ARB_MULTITEXTURE])
 361                 return;
 362             if (gl_info->gl_ops.ext.p_glActiveTexture == wine_glActiveTexture)
 363             {
 364                 FIXME("ARB_multitexture emulation hooks already applied.\n");
 365                 return;
 366             }
 367             TRACE("Applying GL_ARB_multitexture emulation hooks.\n");
 368             gl_info->gl_ops.ext.p_glActiveTexture           = wine_glActiveTexture;
 369             gl_info->gl_ops.ext.p_glClientActiveTextureARB  = wine_glClientActiveTextureARB;
 370             gl_info->gl_ops.ext.p_glMultiTexCoord1fARB      = wine_glMultiTexCoord1fARB;
 371             gl_info->gl_ops.ext.p_glMultiTexCoord1fvARB     = wine_glMultiTexCoord1fvARB;
 372             gl_info->gl_ops.ext.p_glMultiTexCoord2fARB      = wine_glMultiTexCoord2fARB;
 373             gl_info->gl_ops.ext.p_glMultiTexCoord2fvARB     = wine_glMultiTexCoord2fvARB;
 374             gl_info->gl_ops.ext.p_glMultiTexCoord3fARB      = wine_glMultiTexCoord3fARB;
 375             gl_info->gl_ops.ext.p_glMultiTexCoord3fvARB     = wine_glMultiTexCoord3fvARB;
 376             gl_info->gl_ops.ext.p_glMultiTexCoord4fARB      = wine_glMultiTexCoord4fARB;
 377             gl_info->gl_ops.ext.p_glMultiTexCoord4fvARB     = wine_glMultiTexCoord4fvARB;
 378             gl_info->gl_ops.ext.p_glMultiTexCoord2svARB     = wine_glMultiTexCoord2svARB;
 379             gl_info->gl_ops.ext.p_glMultiTexCoord4svARB     = wine_glMultiTexCoord4svARB;
 380             old_multitex_glGetIntegerv = gl_info->gl_ops.gl.p_glGetIntegerv;
 381             gl_info->gl_ops.gl.p_glGetIntegerv = wine_glGetIntegerv;
 382             old_multitex_glGetFloatv = gl_info->gl_ops.gl.p_glGetFloatv;
 383             gl_info->gl_ops.gl.p_glGetFloatv = wine_glGetFloatv;
 384             old_multitex_glGetDoublev = gl_info->gl_ops.gl.p_glGetDoublev;
 385             gl_info->gl_ops.gl.p_glGetDoublev = wine_glGetDoublev;
 386             gl_info->supported[ARB_MULTITEXTURE] = TRUE;
 387             return;
 388
 389         case EXT_FOG_COORD:
 390             /* This emulation isn't perfect. There are a number of potential problems, but they should
 391              * not matter in practise:
 392              *
 393              * Fog vs fragment shader: If we are using GL_ARB_fragment_program with the fog option, the
 394              * glDisable(GL_FOG) here won't matter. However, if we have GL_ARB_fragment_program, it is pretty
 395              * unlikely that we don't have GL_EXT_fog_coord. Besides, we probably have GL_ARB_vertex_program
 396              * too, which would allow fog coord emulation in a fixed function vertex pipeline replacement.
 397              *
 398              * Fog vs texture: We apply the fog in the vertex color. An app could set up texturing settings which
 399              * ignore the vertex color, thus effectively disabling our fog. However, in D3D this type of fog is
 400              * a per-vertex fog too, so the apps shouldn't do that.
 401              *
 402              * Fog vs lighting: The app could in theory use D3DFOG_NONE table and D3DFOG_NONE vertex fog with
 403              * untransformed vertices. That enables lighting and fog coords at the same time, and the lighting
 404              * calculations could affect the already blended in fog color. There's nothing we can do against that,
 405              * but most apps using fog color do their own lighting too and often even use RHW vertices. So live
 406              * with it.
 407              */
 408             if (gl_info->supported[EXT_FOG_COORD])
 409                 return;
 410             if (gl_info->gl_ops.gl.p_glFogi == wine_glFogi)
 411             {
 412                 FIXME("EXT_fog_coord emulation hooks already applied.\n");
 413                 return;
 414             }
 415             TRACE("Applying GL_ARB_fog_coord emulation hooks\n");
 416
 417             /* This probably means that the implementation doesn't advertise the extension, but implicitly supports
 418              * it via the GL core version, or someone messed around in the extension table in directx.c. Add version-
 419              * dependent loading for this extension if we ever hit this situation
 420              */
 421             if (gl_info->supported[ARB_FRAGMENT_PROGRAM])
 422             {
 423                 FIXME("GL implementation supports GL_ARB_fragment_program but not GL_EXT_fog_coord\n");
 424                 FIXME("The fog coord emulation will most likely fail\n");
 425             }
 426             else if (gl_info->supported[ARB_FRAGMENT_SHADER])
 427             {
 428                 FIXME("GL implementation supports GL_ARB_fragment_shader but not GL_EXT_fog_coord\n");
 429                 FIXME("The fog coord emulation will most likely fail\n");
 430             }
 431
 432             old_fogcoord_glFogi = gl_info->gl_ops.gl.p_glFogi;
 433             gl_info->gl_ops.gl.p_glFogi = wine_glFogi;
 434             old_fogcoord_glFogiv = gl_info->gl_ops.gl.p_glFogiv;
 435             gl_info->gl_ops.gl.p_glFogiv = wine_glFogiv;
 436             old_fogcoord_glFogf = gl_info->gl_ops.gl.p_glFogf;
 437             gl_info->gl_ops.gl.p_glFogf = wine_glFogf;
 438             old_fogcoord_glFogfv = gl_info->gl_ops.gl.p_glFogfv;
 439             gl_info->gl_ops.gl.p_glFogfv = wine_glFogfv;
 440             old_fogcoord_glEnable = glEnableWINE;
 441             glEnableWINE = wine_glEnable;
 442             old_fogcoord_glDisable = glDisableWINE;
 443             glDisableWINE = wine_glDisable;
 444
 445             old_fogcoord_glVertex4f = gl_info->gl_ops.gl.p_glVertex4f;
 446             gl_info->gl_ops.gl.p_glVertex4f = wine_glVertex4f;
 447             gl_info->gl_ops.gl.p_glVertex4fv = wine_glVertex4fv;
 448             gl_info->gl_ops.gl.p_glVertex3f = wine_glVertex3f;
 449             gl_info->gl_ops.gl.p_glVertex3fv = wine_glVertex3fv;
 450
 451             old_fogcoord_glColor4f = gl_info->gl_ops.gl.p_glColor4f;
 452             gl_info->gl_ops.gl.p_glColor4f = wine_glColor4f;
 453             gl_info->gl_ops.gl.p_glColor4fv = wine_glColor4fv;
 454             gl_info->gl_ops.gl.p_glColor3f = wine_glColor3f;
 455             gl_info->gl_ops.gl.p_glColor3fv = wine_glColor3fv;
 456             gl_info->gl_ops.gl.p_glColor4ub = wine_glColor4ub;
 457
 458             gl_info->gl_ops.ext.p_glFogCoordfEXT = wine_glFogCoordfEXT;
 459             gl_info->gl_ops.ext.p_glFogCoordfvEXT = wine_glFogCoordfvEXT;
 460             gl_info->gl_ops.ext.p_glFogCoorddEXT = wine_glFogCoorddEXT;
 461             gl_info->gl_ops.ext.p_glFogCoorddvEXT = wine_glFogCoorddvEXT;
 462             gl_info->supported[EXT_FOG_COORD] = TRUE;
 463             return;
 464
 465         default:
 466             FIXME("Extension %u emulation not supported.\n", ext);
 467     }
 468 }