src/mesa/main/extensions.c

   1 /* $Id: extensions.c,v 1.58 2001/04/24 21:52:36 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #ifdef PC_HEADER
  29 #include "all.h"
  30 #else
  31 #include "glheader.h"
  32 #include "context.h"
  33 #include "extensions.h"
  34 #include "mem.h"
  35 #include "simple_list.h"
  36 #include "mtypes.h"
  37 #endif
  38
  39
  40 #define MAX_EXT_NAMELEN 80
  41
  42 struct extension {
  43    struct extension *next, *prev;
  44    GLint enabled;
  45    GLboolean *flag;                     /* optional flag stored elsewhere */
  46    char name[MAX_EXT_NAMELEN+1];
  47    void (*notify)( GLcontext *, GLboolean );
  48 };
  49
  50 #define F(x) (int)&(((struct gl_extensions *)0)->x)
  51 #define ON GL_TRUE
  52 #define OFF GL_FALSE
  53
  54 static struct {
  55    GLboolean enabled;
  56    const char *name;
  57    int flag_offset;
  58 } default_extensions[] = {
  59    { OFF, "GL_ARB_imaging",                    F(ARB_imaging) },
  60    { OFF, "GL_ARB_multitexture",               F(ARB_multitexture) },
  61    { OFF, "GL_ARB_texture_border_clamp",       F(ARB_texture_border_clamp) },
  62    { OFF, "GL_ARB_texture_compression",        F(ARB_texture_compression) },
  63    { OFF, "GL_ARB_texture_cube_map",           F(ARB_texture_cube_map) },
  64    { OFF, "GL_ARB_texture_env_add",            F(EXT_texture_env_add) },
  65    { OFF, "GL_ARB_texture_env_combine",        F(ARB_texture_env_combine) },
  66    { OFF, "GL_ARB_texture_env_dot3",           F(ARB_texture_env_dot3) },
  67    { ON,  "GL_ARB_transpose_matrix",           0 },
  68    { ON,  "GL_EXT_abgr",                       0 },
  69    { ON,  "GL_EXT_bgra",                       0 },
  70    { OFF, "GL_EXT_blend_color",                F(EXT_blend_color) },
  71    { OFF, "GL_EXT_blend_func_separate",        F(EXT_blend_func_separate) },
  72    { OFF, "GL_EXT_blend_logic_op",             F(EXT_blend_logic_op) },
  73    { OFF, "GL_EXT_blend_minmax",               F(EXT_blend_minmax) },
  74    { OFF, "GL_EXT_blend_subtract",             F(EXT_blend_subtract) },
  75    { ON,  "GL_EXT_clip_volume_hint",           F(EXT_clip_volume_hint) },
  76    { OFF, "GL_EXT_cull_vertex",                0 },
  77    { OFF, "GL_EXT_convolution",                F(EXT_convolution) },
  78    { ON,  "GL_EXT_compiled_vertex_array",      F(EXT_compiled_vertex_array) },
  79    { OFF, "GL_EXT_fog_coord",                  F(EXT_fog_coord) },
  80    { OFF, "GL_EXT_histogram",                  F(EXT_histogram) },
  81    { ON,  "GL_EXT_packed_pixels",              F(EXT_packed_pixels) },
  82    { OFF, "GL_EXT_paletted_texture",           F(EXT_paletted_texture) },
  83    { OFF, "GL_EXT_point_parameters",           F(EXT_point_parameters) },
  84    { ON,  "GL_EXT_polygon_offset",             F(EXT_polygon_offset) },
  85    { ON,  "GL_EXT_rescale_normal",             F(EXT_rescale_normal) },
  86    { OFF, "GL_EXT_secondary_color",            F(EXT_secondary_color) },
  87    { OFF, "GL_EXT_shared_texture_palette",     F(EXT_shared_texture_palette) },
  88    { OFF, "GL_EXT_stencil_wrap",               F(EXT_stencil_wrap) },
  89    { ON,  "GL_EXT_texture3D",                  F(EXT_texture3D) },
  90    { OFF, "GL_EXT_texture_compression_s3tc",   F(EXT_texture_compression_s3tc) },
  91    { OFF, "GL_EXT_texture_env_add",            F(EXT_texture_env_add) },
  92    { OFF, "GL_EXT_texture_env_combine",        F(EXT_texture_env_combine) },
  93    { OFF, "GL_EXT_texture_env_dot3",           F(EXT_texture_env_dot3) },
  94    { OFF, "GL_EXT_texture_filter_anisotropic", F(EXT_texture_filter_anisotropic) },
  95    { ON,  "GL_EXT_texture_object",             F(EXT_texture_object) },
  96    { OFF, "GL_EXT_texture_lod_bias",           F(EXT_texture_lod_bias) },
  97    { ON,  "GL_EXT_vertex_array",               0 },
  98    { OFF, "GL_EXT_vertex_array_set",           F(EXT_vertex_array_set) },
  99    { OFF, "GL_HP_occlusion_test",              F(HP_occlusion_test) },
 100    { OFF, "GL_INGR_blend_func_separate",       F(INGR_blend_func_separate) },
 101    { OFF, "GL_MESA_packed_depth_stencil",      0 },
 102    { OFF, "GL_MESA_resize_buffers",            F(MESA_resize_buffers) },
 103    { OFF, "GL_MESA_sprite_point",              F(MESA_sprite_point) },
 104    { ON,  "GL_MESA_window_pos",                F(MESA_window_pos) },
 105    { OFF, "GL_NV_blend_square",                F(NV_blend_square) },
 106    { ON,  "GL_NV_texgen_reflection",           F(NV_texgen_reflection) },
 107    { OFF, "GL_SGI_color_matrix",               F(SGI_color_matrix) },
 108    { OFF, "GL_SGI_color_table",                F(SGI_color_table) },
 109    { OFF, "GL_SGIS_pixel_texture",             F(SGIS_pixel_texture) },
 110    { OFF, "GL_SGIS_texture_border_clamp",      F(ARB_texture_border_clamp) },
 111    { OFF, "GL_SGIS_texture_edge_clamp",        F(SGIS_texture_edge_clamp) },
 112    { OFF, "GL_SGIX_depth_texture",             F(SGIX_depth_texture) },
 113    { OFF, "GL_SGIX_pixel_texture",             F(SGIX_pixel_texture) },
 114    { OFF, "GL_SGIX_shadow",                    F(SGIX_shadow) },
 115    { OFF, "GL_SGIX_shadow_ambient",            F(SGIX_shadow_ambient) },
 116    { OFF, "GL_3DFX_texture_compression_FXT1",  F(_3DFX_texture_compression_FXT1) }
 117 };
 118
 119
 120
 121
 122 /*
 123  * Enable all extensions suitable for a software-only renderer.
 124  * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
 125  */
 126 void
 127 _mesa_enable_sw_extensions(GLcontext *ctx)
 128 {
 129    const char *extensions[] = {
 130       "GL_ARB_imaging",
 131       "GL_ARB_multitexture",
 132       "GL_ARB_texture_border_clamp",
 133       "GL_ARB_texture_cube_map",
 134       "GL_ARB_texture_env_add",
 135       "GL_ARB_texture_env_combine",
 136       "GL_ARB_texture_env_dot3",
 137       "GL_EXT_blend_color",
 138       "GL_EXT_blend_func_separate",
 139       "GL_EXT_blend_logic_op",
 140       "GL_EXT_blend_minmax",
 141       "GL_EXT_blend_subtract",
 142       "GL_EXT_convolution",
 143       "GL_EXT_fog_coord",
 144       "GL_EXT_histogram",
 145       "GL_EXT_paletted_texture",
 146       "GL_EXT_point_parameters",
 147       "GL_EXT_secondary_color",
 148       "GL_EXT_shared_texture_palette",
 149       "GL_EXT_stencil_wrap",
 150       "GL_EXT_texture_env_add",
 151       "GL_EXT_texture_env_combine",
 152       "GL_EXT_texture_env_dot3",
 153       "GL_EXT_texture_lod_bias",
 154       "GL_HP_occlusion_test",
 155       "GL_INGR_blend_func_separate",
 156       "GL_MESA_resize_buffers",
 157       "GL_NV_blend_square",
 158       "GL_NV_texgen_reflection",
 159       "GL_SGI_color_matrix",
 160       "GL_SGI_color_table",
 161       "GL_SGIS_pixel_texture",
 162       "GL_SGIS_texture_edge_clamp",
 163       "GL_SGIS_texture_border_clamp",
 164       "GL_SGIX_depth_texture",
 165       "GL_SGIX_pixel_texture",
 166       "GL_SGIX_shadow",
 167       "GL_SGIX_shadow_ambient",
 168       NULL
 169    };
 170    GLuint i;
 171
 172    for (i = 0; extensions[i]; i++) {
 173       _mesa_enable_extension(ctx, extensions[i]);
 174    }
 175 }
 176
 177
 178 /*
 179  * Enable GL_ARB_imaging and all the EXT extensions that are subsets of it.
 180  */
 181 void
 182 _mesa_enable_imaging_extensions(GLcontext *ctx)
 183 {
 184    const char *extensions[] = {
 185       "GL_ARB_imaging",
 186       "GL_EXT_blend_color",
 187       "GL_EXT_blend_minmax",
 188       "GL_EXT_blend_subtract",
 189       "GL_EXT_convolution",
 190       "GL_EXT_histogram",
 191       "GL_SGI_color_matrix",
 192       "GL_SGI_color_table",
 193       NULL
 194    };
 195    GLuint i;
 196
 197    for (i = 0; extensions[i]; i++) {
 198       _mesa_enable_extension(ctx, extensions[i]);
 199    }
 200 }
 201
 202
 203 /*
 204  * Add a new extenstion.  This would be called from a Mesa driver.
 205  */
 206 void
 207 _mesa_add_extension( GLcontext *ctx,
 208                      GLboolean enabled,
 209                      const char *name,
 210                      GLboolean *flag_ptr )
 211 {
 212    /* We should never try to add an extension after
 213     * _mesa_extensions_get_string() has been called!
 214     */
 215    assert(ctx->Extensions.ext_string == 0);
 216
 217    {
 218       struct extension *t = MALLOC_STRUCT(extension);
 219       t->enabled = enabled;
 220       strncpy(t->name, name, MAX_EXT_NAMELEN);
 221       t->name[MAX_EXT_NAMELEN] = 0;
 222       t->flag = flag_ptr;
 223       if (t->flag)
 224          *t->flag = enabled;
 225       insert_at_tail( ctx->Extensions.ext_list, t );
 226    }
 227 }
 228
 229
 230 /*
 231  * Either enable or disable the named extension.
 232  */
 233 static void
 234 set_extension( GLcontext *ctx, const char *name, GLint state )
 235 {
 236    /* XXX we should assert that ext_string is null.  We should never be
 237     * enabling/disabling extensions after _mesa_extensions_get_string()
 238     * has been called!
 239     */
 240    struct extension *i;
 241    foreach( i, ctx->Extensions.ext_list )
 242       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0)
 243          break;
 244
 245    if (i == ctx->Extensions.ext_list) {
 246       /* this is an error.  Drivers should never try to enable/disable
 247        * an extension which is unknown to Mesa or wasn't added by calling
 248        * _mesa_add_extension().
 249        */
 250       return;
 251    }
 252
 253    if (i->flag)
 254       *(i->flag) = state;
 255    i->enabled = state;
 256 }
 257
 258
 259
 260 void
 261 _mesa_enable_extension( GLcontext *ctx, const char *name )
 262 {
 263    if (ctx->Extensions.ext_string == 0)
 264       set_extension( ctx, name, 1 );
 265 }
 266
 267
 268 void
 269 _mesa_disable_extension( GLcontext *ctx, const char *name )
 270 {
 271    if (ctx->Extensions.ext_string == 0)
 272       set_extension( ctx, name, 0 );
 273 }
 274
 275
 276 /*
 277  * Test if the named extension is enabled in this context.
 278  */
 279 GLboolean
 280 _mesa_extension_is_enabled( GLcontext *ctx, const char *name)
 281 {
 282    struct extension *i;
 283    foreach( i, ctx->Extensions.ext_list )
 284       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0) {
 285          if (i->enabled)
 286             return GL_TRUE;
 287          else
 288             return GL_FALSE;
 289       }
 290
 291    return GL_FALSE;
 292 }
 293
 294
 295 void
 296 _mesa_extensions_dtr( GLcontext *ctx )
 297 {
 298    struct extension *i, *nexti;
 299
 300    if (ctx->Extensions.ext_string) {
 301       FREE( ctx->Extensions.ext_string );
 302       ctx->Extensions.ext_string = 0;
 303    }
 304
 305    if (ctx->Extensions.ext_list) {
 306       foreach_s( i, nexti, ctx->Extensions.ext_list ) {
 307          remove_from_list( i );
 308          FREE( i );
 309       }
 310
 311       FREE(ctx->Extensions.ext_list);
 312       ctx->Extensions.ext_list = 0;
 313    }
 314 }
 315
 316
 317 void
 318 _mesa_extensions_ctr( GLcontext *ctx )
 319 {
 320    GLuint i;
 321    GLboolean *base = (GLboolean *)&ctx->Extensions;
 322
 323    ctx->Extensions.ext_string = NULL;
 324    ctx->Extensions.ext_list = MALLOC_STRUCT(extension);
 325    make_empty_list( ctx->Extensions.ext_list );
 326
 327    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 328       GLboolean *ptr = NULL;
 329
 330       if (default_extensions[i].flag_offset)
 331          ptr = base + default_extensions[i].flag_offset;
 332
 333       (void) _mesa_add_extension( ctx,
 334                                   default_extensions[i].enabled,
 335                                   default_extensions[i].name,
 336                                   ptr);
 337    }
 338 }
 339
 340
 341 const char *
 342 _mesa_extensions_get_string( GLcontext *ctx )
 343 {
 344    if (ctx->Extensions.ext_string == 0)
 345    {
 346       struct extension *i;
 347       char *str;
 348       GLuint len = 0;
 349       foreach (i, ctx->Extensions.ext_list)
 350          if (i->enabled)
 351             len += strlen(i->name) + 1;
 352
 353       if (len == 0)
 354          return "";
 355
 356       str = (char *)MALLOC(len * sizeof(char));
 357       ctx->Extensions.ext_string = str;
 358
 359       foreach (i, ctx->Extensions.ext_list)
 360          if (i->enabled) {
 361             strcpy(str, i->name);
 362             str += strlen(str);
 363             *str++ = ' ';
 364          }
 365
 366       *(str-1) = 0;
 367    }
 368
 369    return ctx->Extensions.ext_string;
 370 }