src/mesa/main/extensions.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.3
   4  *
   5  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 #include "glheader.h"
  27 #include "imports.h"
  28 #include "context.h"
  29 #include "extensions.h"
  30 #include "simple_list.h"
  31 #include "mtypes.h"
  32
  33
  34 #define F(x) (int)(unsigned long)&(((struct gl_extensions *)0)->x)
  35 #define ON GL_TRUE
  36 #define OFF GL_FALSE
  37
  38
  39 /*
  40  * Note: The GL_MESAX_* extensions are placeholders for future ARB extensions.
  41  */
  42 static const struct {
  43    GLboolean enabled;
  44    const char *name;
  45    int flag_offset;
  46 } default_extensions[] = {
  47    { OFF, "GL_ARB_depth_texture",              F(ARB_depth_texture) },
  48    { OFF, "GL_ARB_draw_buffers",               F(ARB_draw_buffers) },
  49    { OFF, "GL_ARB_fragment_program",           F(ARB_fragment_program) },
  50    { OFF, "GL_ARB_fragment_shader",            F(ARB_fragment_shader) },
  51    { OFF, "GL_MESAX_half_float_pixel",         F(ARB_half_float_pixel) },
  52    { OFF, "GL_ARB_imaging",                    F(ARB_imaging) },
  53    { OFF, "GL_ARB_multisample",                F(ARB_multisample) },
  54    { OFF, "GL_ARB_multitexture",               F(ARB_multitexture) },
  55    { OFF, "GL_ARB_occlusion_query",            F(ARB_occlusion_query) },
  56    { OFF, "GL_ARB_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
  57    { OFF, "GL_ARB_point_parameters",           F(EXT_point_parameters) },
  58    { OFF, "GL_ARB_point_sprite",               F(ARB_point_sprite) },
  59    { OFF, "GL_ARB_shader_objects",             F(ARB_shader_objects) },
  60    { OFF, "GL_ARB_shadow",                     F(ARB_shadow) },
  61    { OFF, "GL_ARB_shadow_ambient",             F(SGIX_shadow_ambient) },
  62    { OFF, "GL_ARB_texture_border_clamp",       F(ARB_texture_border_clamp) },
  63    { OFF, "GL_ARB_texture_compression",        F(ARB_texture_compression) },
  64    { OFF, "GL_ARB_texture_cube_map",           F(ARB_texture_cube_map) },
  65    { OFF, "GL_ARB_texture_env_add",            F(EXT_texture_env_add) },
  66    { OFF, "GL_ARB_texture_env_combine",        F(ARB_texture_env_combine) },
  67    { OFF, "GL_ARB_texture_env_crossbar",       F(ARB_texture_env_crossbar) },
  68    { OFF, "GL_ARB_texture_env_dot3",           F(ARB_texture_env_dot3) },
  69    { OFF, "GL_MESAX_texture_float",            F(ARB_texture_float) },
  70    { OFF, "GL_ARB_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
  71    { OFF, "GL_ARB_texture_non_power_of_two",   F(ARB_texture_non_power_of_two)},
  72    { OFF, "GL_ARB_texture_rectangle",          F(NV_texture_rectangle) },
  73    { ON,  "GL_ARB_transpose_matrix",           F(ARB_transpose_matrix) },
  74    { OFF, "GL_ARB_vertex_buffer_object",       F(ARB_vertex_buffer_object) },
  75    { OFF, "GL_ARB_vertex_program",             F(ARB_vertex_program) },
  76    { OFF, "GL_ARB_vertex_shader",              F(ARB_vertex_shader) },
  77    { ON,  "GL_ARB_window_pos",                 F(ARB_window_pos) },
  78    { ON,  "GL_EXT_abgr",                       F(EXT_abgr) },
  79    { ON,  "GL_EXT_bgra",                       F(EXT_bgra) },
  80    { OFF, "GL_EXT_blend_color",                F(EXT_blend_color) },
  81    { OFF, "GL_EXT_blend_equation_separate",    F(EXT_blend_equation_separate) },
  82    { OFF, "GL_EXT_blend_func_separate",        F(EXT_blend_func_separate) },
  83    { OFF, "GL_EXT_blend_logic_op",             F(EXT_blend_logic_op) },
  84    { OFF, "GL_EXT_blend_minmax",               F(EXT_blend_minmax) },
  85    { OFF, "GL_EXT_blend_subtract",             F(EXT_blend_subtract) },
  86    { ON,  "GL_EXT_clip_volume_hint",           F(EXT_clip_volume_hint) },
  87    { OFF, "GL_EXT_cull_vertex",                F(EXT_cull_vertex) },
  88    { ON,  "GL_EXT_compiled_vertex_array",      F(EXT_compiled_vertex_array) },
  89    { OFF, "GL_EXT_convolution",                F(EXT_convolution) },
  90    { ON,  "GL_EXT_copy_texture",               F(EXT_copy_texture) },
  91    { OFF, "GL_EXT_depth_bounds_test",          F(EXT_depth_bounds_test) },
  92    { ON,  "GL_EXT_draw_range_elements",        F(EXT_draw_range_elements) },
  93    { OFF, "GL_EXT_framebuffer_object",         F(EXT_framebuffer_object) },
  94    { OFF, "GL_EXT_fog_coord",                  F(EXT_fog_coord) },
  95    { OFF, "GL_EXT_histogram",                  F(EXT_histogram) },
  96    { OFF, "GL_EXT_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
  97    { ON,  "GL_EXT_packed_pixels",              F(EXT_packed_pixels) },
  98    { OFF, "GL_EXT_paletted_texture",           F(EXT_paletted_texture) },
  99    { OFF, "GL_EXT_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
 100    { OFF, "GL_EXT_point_parameters",           F(EXT_point_parameters) },
 101    { ON,  "GL_EXT_polygon_offset",             F(EXT_polygon_offset) },
 102    { ON,  "GL_EXT_rescale_normal",             F(EXT_rescale_normal) },
 103    { OFF, "GL_EXT_secondary_color",            F(EXT_secondary_color) },
 104    { ON,  "GL_EXT_separate_specular_color",    F(EXT_separate_specular_color) },
 105    { OFF, "GL_EXT_shadow_funcs",               F(EXT_shadow_funcs) },
 106    { OFF, "GL_EXT_shared_texture_palette",     F(EXT_shared_texture_palette) },
 107    { OFF, "GL_EXT_stencil_two_side",           F(EXT_stencil_two_side) },
 108    { OFF, "GL_EXT_stencil_wrap",               F(EXT_stencil_wrap) },
 109    { ON,  "GL_EXT_subtexture",                 F(EXT_subtexture) },
 110    { ON,  "GL_EXT_texture",                    F(EXT_texture) },
 111    { ON,  "GL_EXT_texture3D",                  F(EXT_texture3D) },
 112    { OFF, "GL_EXT_texture_compression_s3tc",   F(EXT_texture_compression_s3tc) },
 113    { ON,  "GL_EXT_texture_edge_clamp",         F(SGIS_texture_edge_clamp) },
 114    { OFF, "GL_EXT_texture_env_add",            F(EXT_texture_env_add) },
 115    { OFF, "GL_EXT_texture_env_combine",        F(EXT_texture_env_combine) },
 116    { OFF, "GL_EXT_texture_env_dot3",           F(EXT_texture_env_dot3) },
 117    { OFF, "GL_EXT_texture_filter_anisotropic", F(EXT_texture_filter_anisotropic) },
 118    { OFF, "GL_EXT_texture_lod_bias",           F(EXT_texture_lod_bias) },
 119    { OFF, "GL_EXT_texture_mirror_clamp",       F(EXT_texture_mirror_clamp) },
 120    { ON,  "GL_EXT_texture_object",             F(EXT_texture_object) },
 121    { OFF, "GL_EXT_texture_rectangle",          F(NV_texture_rectangle) },
 122    { ON,  "GL_EXT_vertex_array",               F(EXT_vertex_array) },
 123    { OFF, "GL_EXT_vertex_array_set",           F(EXT_vertex_array_set) },
 124    { OFF, "GL_3DFX_texture_compression_FXT1",  F(TDFX_texture_compression_FXT1) },
 125    { OFF, "GL_APPLE_client_storage",           F(APPLE_client_storage) },
 126    { ON,  "GL_APPLE_packed_pixels",            F(APPLE_packed_pixels) },
 127    { OFF, "GL_ATI_blend_equation_separate",    F(EXT_blend_equation_separate) },
 128    { OFF, "GL_ATI_texture_env_combine3",       F(ATI_texture_env_combine3)},
 129    { OFF, "GL_ATI_texture_mirror_once",        F(ATI_texture_mirror_once)},
 130    { OFF, "GL_ATI_fragment_shader",            F(ATI_fragment_shader)},
 131    { OFF, "GL_HP_occlusion_test",              F(HP_occlusion_test) },
 132    { OFF, "GL_IBM_multimode_draw_arrays",      F(IBM_multimode_draw_arrays) },
 133    { ON,  "GL_IBM_rasterpos_clip",             F(IBM_rasterpos_clip) },
 134    { OFF, "GL_IBM_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
 135    { OFF, "GL_INGR_blend_func_separate",       F(EXT_blend_func_separate) },
 136    { OFF, "GL_MESA_pack_invert",               F(MESA_pack_invert) },
 137    { OFF, "GL_MESA_packed_depth_stencil",      F(MESA_packed_depth_stencil) },
 138    { OFF, "GL_MESA_program_debug",             F(MESA_program_debug) },
 139    { OFF, "GL_MESA_resize_buffers",            F(MESA_resize_buffers) },
 140    { OFF, "GL_MESA_ycbcr_texture",             F(MESA_ycbcr_texture) },
 141    { ON,  "GL_MESA_window_pos",                F(ARB_window_pos) },
 142    { OFF, "GL_NV_blend_square",                F(NV_blend_square) },
 143    { OFF, "GL_NV_fragment_program",            F(NV_fragment_program) },
 144    { ON,  "GL_NV_light_max_exponent",          F(NV_light_max_exponent) },
 145    { OFF, "GL_NV_point_sprite",                F(NV_point_sprite) },
 146    { OFF, "GL_NV_texture_rectangle",           F(NV_texture_rectangle) },
 147    { ON,  "GL_NV_texgen_reflection",           F(NV_texgen_reflection) },
 148    { OFF, "GL_NV_vertex_program",              F(NV_vertex_program) },
 149    { OFF, "GL_NV_vertex_program1_1",           F(NV_vertex_program1_1) },
 150    { ON,  "GL_OES_read_format",                F(OES_read_format) },
 151    { OFF, "GL_SGI_color_matrix",               F(SGI_color_matrix) },
 152    { OFF, "GL_SGI_color_table",                F(SGI_color_table) },
 153    { OFF, "GL_SGI_texture_color_table",        F(SGI_texture_color_table) },
 154    { OFF, "GL_SGIS_generate_mipmap",           F(SGIS_generate_mipmap) },
 155    { OFF, "GL_SGIS_pixel_texture",             F(SGIS_pixel_texture) },
 156    { OFF, "GL_SGIS_texture_border_clamp",      F(ARB_texture_border_clamp) },
 157    { ON,  "GL_SGIS_texture_edge_clamp",        F(SGIS_texture_edge_clamp) },
 158    { ON,  "GL_SGIS_texture_lod",               F(SGIS_texture_lod) },
 159    { OFF, "GL_SGIX_depth_texture",             F(SGIX_depth_texture) },
 160    { OFF, "GL_SGIX_pixel_texture",             F(SGIX_pixel_texture) },
 161    { OFF, "GL_SGIX_shadow",                    F(SGIX_shadow) },
 162    { OFF, "GL_SGIX_shadow_ambient",            F(SGIX_shadow_ambient) },
 163    { OFF, "GL_SUN_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
 164    { OFF, "GL_S3_s3tc",                        F(S3_s3tc) },
 165 };
 166
 167
 168
 169 /**
 170  * Enable all extensions suitable for a software-only renderer.
 171  * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
 172  */
 173 void
 174 _mesa_enable_sw_extensions(GLcontext *ctx)
 175 {
 176    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 177    ctx->Extensions.ARB_draw_buffers = GL_TRUE;
 178 #if FEATURE_ARB_fragment_program
 179    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 180 #endif
 181    /*ctx->Extensions.ARB_half_float_pixel = GL_TRUE;*/
 182    ctx->Extensions.ARB_imaging = GL_TRUE;
 183    ctx->Extensions.ARB_multitexture = GL_TRUE;
 184 #if FEATURE_ARB_occlusion_query
 185    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 186 #endif
 187    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 188    ctx->Extensions.ARB_shadow = GL_TRUE;
 189    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 190    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 191    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 192    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 193    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 194    /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
 195    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 196    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 197 #if FEATURE_ARB_vertex_program
 198    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 199 #endif
 200 #if FEATURE_ARB_vertex_buffer_object
 201    ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
 202 #endif
 203 #if FEATURE_ARB_shader_objects
 204    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 205 #if FEATURE_ARB_fragment_shader
 206    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 207 #endif
 208 #if FEATURE_ARB_vertex_shader
 209    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 210 #endif
 211 #endif
 212 #if FEATURE_ATI_fragment_shader
 213    ctx->Extensions.ATI_fragment_shader = GL_TRUE;
 214 #endif
 215    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 216    ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 217    ctx->Extensions.EXT_blend_color = GL_TRUE;
 218    ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 219    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 220    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 221    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 222    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 223    ctx->Extensions.EXT_convolution = GL_TRUE;
 224    ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
 225    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 226    /*ctx->Extensions.EXT_framebuffer_object = GL_TRUE;*/
 227    ctx->Extensions.EXT_histogram = GL_TRUE;
 228    ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
 229    ctx->Extensions.EXT_paletted_texture = GL_TRUE;
 230 #if FEATURE_EXT_pixel_buffer_object
 231    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 232 #endif
 233    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 234    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 235    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 236    ctx->Extensions.EXT_shared_texture_palette = GL_TRUE;
 237    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 238    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 239    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 240    ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
 241    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 242    ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 243    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 244    ctx->Extensions.HP_occlusion_test = GL_TRUE;
 245    ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;
 246    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 247 #if FEATURE_MESA_program_debug
 248    ctx->Extensions.MESA_program_debug = GL_TRUE;
 249 #endif
 250    ctx->Extensions.MESA_resize_buffers = GL_TRUE;
 251    ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 252    ctx->Extensions.NV_blend_square = GL_TRUE;
 253    /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
 254    ctx->Extensions.NV_point_sprite = GL_TRUE;
 255    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 256    /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
 257 #if FEATURE_NV_vertex_program
 258    ctx->Extensions.NV_vertex_program = GL_TRUE;
 259    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 260 #endif
 261 #if FEATURE_NV_fragment_program
 262    ctx->Extensions.NV_fragment_program = GL_TRUE;
 263 #endif
 264    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 265    ctx->Extensions.SGI_color_table = GL_TRUE;
 266    ctx->Extensions.SGI_texture_color_table = GL_TRUE;
 267    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 268    ctx->Extensions.SGIS_pixel_texture = GL_TRUE;
 269    ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE;
 270    ctx->Extensions.SGIX_depth_texture = GL_TRUE;
 271    ctx->Extensions.SGIX_pixel_texture = GL_TRUE;
 272    ctx->Extensions.SGIX_shadow = GL_TRUE;
 273    ctx->Extensions.SGIX_shadow_ambient = GL_TRUE;
 274 }
 275
 276
 277 /**
 278  * Enable GL_ARB_imaging and all the EXT extensions that are subsets of it.
 279  */
 280 void
 281 _mesa_enable_imaging_extensions(GLcontext *ctx)
 282 {
 283    ctx->Extensions.ARB_imaging = GL_TRUE;
 284    ctx->Extensions.EXT_blend_color = GL_TRUE;
 285    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 286    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 287    ctx->Extensions.EXT_convolution = GL_TRUE;
 288    ctx->Extensions.EXT_histogram = GL_TRUE;
 289    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 290    ctx->Extensions.SGI_color_table = GL_TRUE;
 291 }
 292
 293
 294
 295 /**
 296  * Enable all OpenGL 1.3 features and extensions.
 297  * A convenience function to be called by drivers.
 298  */
 299 void
 300 _mesa_enable_1_3_extensions(GLcontext *ctx)
 301 {
 302    ctx->Extensions.ARB_multisample = GL_TRUE;
 303    ctx->Extensions.ARB_multitexture = GL_TRUE;
 304    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 305    ctx->Extensions.ARB_texture_compression = GL_TRUE;
 306    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 307    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 308    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 309    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 310    /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
 311 }
 312
 313
 314
 315 /**
 316  * Enable all OpenGL 1.4 features and extensions.
 317  * A convenience function to be called by drivers.
 318  */
 319 void
 320 _mesa_enable_1_4_extensions(GLcontext *ctx)
 321 {
 322    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 323    ctx->Extensions.ARB_shadow = GL_TRUE;
 324    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 325    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 326    ctx->Extensions.ARB_window_pos = GL_TRUE;
 327    ctx->Extensions.EXT_blend_color = GL_TRUE;
 328    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 329    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 330    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 331    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 332    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 333    ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
 334    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 335    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 336    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 337    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 338    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 339 }
 340
 341
 342 /**
 343  * Enable all OpenGL 1.5 features and extensions.
 344  * A convenience function to be called by drivers.
 345  */
 346 void
 347 _mesa_enable_1_5_extensions(GLcontext *ctx)
 348 {
 349    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 350    ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
 351    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 352 }
 353
 354
 355 /**
 356  * Enable all OpenGL 2.0 features and extensions.
 357  * A convenience function to be called by drivers.
 358  */
 359 void
 360 _mesa_enable_2_0_extensions(GLcontext *ctx)
 361 {
 362    ctx->Extensions.ARB_draw_buffers = GL_TRUE;
 363    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 364    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 365    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 366 #if FEATURE_ARB_shader_objects
 367    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 368 #if FEATURE_ARB_fragment_shader
 369    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 370 #endif
 371 #if FEATURE_ARB_vertex_shader
 372    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 373 #endif
 374 #endif
 375 }
 376
 377
 378
 379 /**
 380  * Either enable or disable the named extension.
 381  */
 382 static void
 383 set_extension( GLcontext *ctx, const char *name, GLboolean state )
 384 {
 385    GLboolean *base = (GLboolean *) &ctx->Extensions;
 386    GLuint i;
 387
 388    if (ctx->Extensions.String) {
 389       /* The string was already queried - can't change it now! */
 390       _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
 391       return;
 392    }
 393
 394    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 395       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 396          if (default_extensions[i].flag_offset) {
 397             GLboolean *enabled = base + default_extensions[i].flag_offset;
 398             *enabled = state;
 399          }
 400          return;
 401       }
 402    }
 403    _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
 404 }
 405
 406
 407 /**
 408  * Enable the named extension.
 409  * Typically called by drivers.
 410  */
 411 void
 412 _mesa_enable_extension( GLcontext *ctx, const char *name )
 413 {
 414    set_extension(ctx, name, GL_TRUE);
 415 }
 416
 417
 418 /**
 419  * Disable the named extension.
 420  * XXX is this really needed???
 421  */
 422 void
 423 _mesa_disable_extension( GLcontext *ctx, const char *name )
 424 {
 425    set_extension(ctx, name, GL_FALSE);
 426 }
 427
 428
 429 /**
 430  * Test if the named extension is enabled in this context.
 431  */
 432 GLboolean
 433 _mesa_extension_is_enabled( GLcontext *ctx, const char *name )
 434 {
 435    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 436    GLuint i;
 437
 438    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 439       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 440          if (!default_extensions[i].flag_offset)
 441             return GL_TRUE;
 442          return *(base + default_extensions[i].flag_offset);
 443       }
 444    }
 445    return GL_FALSE;
 446 }
 447
 448
 449 /**
 450  * Run through the default_extensions array above and set the
 451  * ctx->Extensions.ARB/EXT_* flags accordingly.
 452  * To be called during context initialization.
 453  */
 454 void
 455 _mesa_init_extensions( GLcontext *ctx )
 456 {
 457    GLboolean *base = (GLboolean *) &ctx->Extensions;
 458    GLuint i;
 459
 460    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 461       if (default_extensions[i].enabled &&
 462           default_extensions[i].flag_offset) {
 463          *(base + default_extensions[i].flag_offset) = GL_TRUE;
 464       }
 465    }
 466 }
 467
 468
 469 /**
 470  * Construct the GL_EXTENSIONS string.  Called the first time that
 471  * glGetString(GL_EXTENSIONS) is called.
 472  */
 473 GLubyte *
 474 _mesa_make_extension_string( GLcontext *ctx )
 475 {
 476    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 477    GLuint extStrLen = 0;
 478    GLubyte *s;
 479    GLuint i;
 480
 481    /* first, compute length of the extension string */
 482    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 483       if (!default_extensions[i].flag_offset ||
 484           *(base + default_extensions[i].flag_offset)) {
 485          extStrLen += _mesa_strlen(default_extensions[i].name) + 1;
 486       }
 487    }
 488    s = (GLubyte *) _mesa_malloc(extStrLen);
 489
 490    /* second, build the extension string */
 491    extStrLen = 0;
 492    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 493       if (!default_extensions[i].flag_offset ||
 494           *(base + default_extensions[i].flag_offset)) {
 495          GLuint len = _mesa_strlen(default_extensions[i].name);
 496          _mesa_memcpy(s + extStrLen, default_extensions[i].name, len);
 497          extStrLen += len;
 498          s[extStrLen] = (GLubyte) ' ';
 499          extStrLen++;
 500       }
 501    }
 502    ASSERT(extStrLen > 0);
 503
 504    s[extStrLen - 1] = 0;
 505
 506    return s;
 507 }