src/mesa/main/extensions.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2008  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)(uintptr_t)&(((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_program_shadow",    F(ARB_fragment_program_shadow) },
  51    { OFF, "GL_ARB_fragment_shader",            F(ARB_fragment_shader) },
  52    { OFF, "GL_ARB_half_float_pixel",           F(ARB_half_float_pixel) },
  53    { OFF, "GL_ARB_imaging",                    F(ARB_imaging) },
  54    { OFF, "GL_ARB_multisample",                F(ARB_multisample) },
  55    { OFF, "GL_ARB_multitexture",               F(ARB_multitexture) },
  56    { OFF, "GL_ARB_occlusion_query",            F(ARB_occlusion_query) },
  57    { OFF, "GL_ARB_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
  58    { OFF, "GL_ARB_point_parameters",           F(EXT_point_parameters) },
  59    { OFF, "GL_ARB_point_sprite",               F(ARB_point_sprite) },
  60    { OFF, "GL_ARB_shader_objects",             F(ARB_shader_objects) },
  61    { OFF, "GL_ARB_shading_language_100",       F(ARB_shading_language_100) },
  62    { OFF, "GL_ARB_shading_language_120",       F(ARB_shading_language_120) },
  63    { OFF, "GL_ARB_shadow",                     F(ARB_shadow) },
  64    { OFF, "GL_ARB_shadow_ambient",             F(SGIX_shadow_ambient) },
  65    { OFF, "GL_ARB_texture_border_clamp",       F(ARB_texture_border_clamp) },
  66    { OFF, "GL_ARB_texture_compression",        F(ARB_texture_compression) },
  67    { OFF, "GL_ARB_texture_cube_map",           F(ARB_texture_cube_map) },
  68    { OFF, "GL_ARB_texture_env_add",            F(EXT_texture_env_add) },
  69    { OFF, "GL_ARB_texture_env_combine",        F(ARB_texture_env_combine) },
  70    { OFF, "GL_ARB_texture_env_crossbar",       F(ARB_texture_env_crossbar) },
  71    { OFF, "GL_ARB_texture_env_dot3",           F(ARB_texture_env_dot3) },
  72    { OFF, "GL_MESAX_texture_float",            F(ARB_texture_float) },
  73    { OFF, "GL_ARB_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
  74    { OFF, "GL_ARB_texture_non_power_of_two",   F(ARB_texture_non_power_of_two)},
  75    { OFF, "GL_ARB_texture_rectangle",          F(NV_texture_rectangle) },
  76    { ON,  "GL_ARB_transpose_matrix",           F(ARB_transpose_matrix) },
  77    { OFF, "GL_ARB_vertex_buffer_object",       F(ARB_vertex_buffer_object) },
  78    { OFF, "GL_ARB_vertex_program",             F(ARB_vertex_program) },
  79    { OFF, "GL_ARB_vertex_shader",              F(ARB_vertex_shader) },
  80    { ON,  "GL_ARB_window_pos",                 F(ARB_window_pos) },
  81    { ON,  "GL_EXT_abgr",                       F(EXT_abgr) },
  82    { ON,  "GL_EXT_bgra",                       F(EXT_bgra) },
  83    { OFF, "GL_EXT_blend_color",                F(EXT_blend_color) },
  84    { OFF, "GL_EXT_blend_equation_separate",    F(EXT_blend_equation_separate) },
  85    { OFF, "GL_EXT_blend_func_separate",        F(EXT_blend_func_separate) },
  86    { OFF, "GL_EXT_blend_logic_op",             F(EXT_blend_logic_op) },
  87    { OFF, "GL_EXT_blend_minmax",               F(EXT_blend_minmax) },
  88    { OFF, "GL_EXT_blend_subtract",             F(EXT_blend_subtract) },
  89    { OFF, "GL_EXT_clip_volume_hint",           F(EXT_clip_volume_hint) },
  90    { OFF, "GL_EXT_cull_vertex",                F(EXT_cull_vertex) },
  91    { ON,  "GL_EXT_compiled_vertex_array",      F(EXT_compiled_vertex_array) },
  92    { OFF, "GL_EXT_convolution",                F(EXT_convolution) },
  93    { ON,  "GL_EXT_copy_texture",               F(EXT_copy_texture) },
  94    { OFF, "GL_EXT_depth_bounds_test",          F(EXT_depth_bounds_test) },
  95    { ON,  "GL_EXT_draw_range_elements",        F(EXT_draw_range_elements) },
  96    { OFF, "GL_EXT_framebuffer_object",         F(EXT_framebuffer_object) },
  97    { OFF, "GL_EXT_framebuffer_blit",           F(EXT_framebuffer_blit) },
  98    { OFF, "GL_EXT_fog_coord",                  F(EXT_fog_coord) },
  99    { OFF, "GL_EXT_gpu_program_parameters",     F(EXT_gpu_program_parameters) },
 100    { OFF, "GL_EXT_histogram",                  F(EXT_histogram) },
 101    { OFF, "GL_EXT_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
 102    { OFF, "GL_EXT_packed_depth_stencil",       F(EXT_packed_depth_stencil) },
 103    { ON,  "GL_EXT_packed_pixels",              F(EXT_packed_pixels) },
 104    { OFF, "GL_EXT_paletted_texture",           F(EXT_paletted_texture) },
 105    { OFF, "GL_EXT_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
 106    { OFF, "GL_EXT_point_parameters",           F(EXT_point_parameters) },
 107    { ON,  "GL_EXT_polygon_offset",             F(EXT_polygon_offset) },
 108    { ON,  "GL_EXT_rescale_normal",             F(EXT_rescale_normal) },
 109    { OFF, "GL_EXT_secondary_color",            F(EXT_secondary_color) },
 110    { ON,  "GL_EXT_separate_specular_color",    F(EXT_separate_specular_color) },
 111    { OFF, "GL_EXT_shadow_funcs",               F(EXT_shadow_funcs) },
 112    { OFF, "GL_EXT_shared_texture_palette",     F(EXT_shared_texture_palette) },
 113    { OFF, "GL_EXT_stencil_two_side",           F(EXT_stencil_two_side) },
 114    { OFF, "GL_EXT_stencil_wrap",               F(EXT_stencil_wrap) },
 115    { ON,  "GL_EXT_subtexture",                 F(EXT_subtexture) },
 116    { ON,  "GL_EXT_texture",                    F(EXT_texture) },
 117    { ON,  "GL_EXT_texture3D",                  F(EXT_texture3D) },
 118    { OFF, "GL_EXT_texture_compression_s3tc",   F(EXT_texture_compression_s3tc) },
 119    { ON,  "GL_EXT_texture_edge_clamp",         F(SGIS_texture_edge_clamp) },
 120    { OFF, "GL_EXT_texture_env_add",            F(EXT_texture_env_add) },
 121    { OFF, "GL_EXT_texture_env_combine",        F(EXT_texture_env_combine) },
 122    { OFF, "GL_EXT_texture_env_dot3",           F(EXT_texture_env_dot3) },
 123    { OFF, "GL_EXT_texture_filter_anisotropic", F(EXT_texture_filter_anisotropic) },
 124    { OFF, "GL_EXT_texture_lod_bias",           F(EXT_texture_lod_bias) },
 125    { OFF, "GL_EXT_texture_mirror_clamp",       F(EXT_texture_mirror_clamp) },
 126    { ON,  "GL_EXT_texture_object",             F(EXT_texture_object) },
 127    { OFF, "GL_EXT_texture_rectangle",          F(NV_texture_rectangle) },
 128    { OFF, "GL_EXT_texture_sRGB",               F(EXT_texture_sRGB) },
 129    { OFF, "GL_EXT_timer_query",                F(EXT_timer_query) },
 130    { ON,  "GL_EXT_vertex_array",               F(EXT_vertex_array) },
 131    { OFF, "GL_EXT_vertex_array_set",           F(EXT_vertex_array_set) },
 132    { OFF, "GL_3DFX_texture_compression_FXT1",  F(TDFX_texture_compression_FXT1) },
 133    { OFF, "GL_APPLE_client_storage",           F(APPLE_client_storage) },
 134    { ON,  "GL_APPLE_packed_pixels",            F(APPLE_packed_pixels) },
 135    { OFF, "GL_APPLE_vertex_array_object",      F(APPLE_vertex_array_object) },
 136    { OFF, "GL_ATI_blend_equation_separate",    F(EXT_blend_equation_separate) },
 137    { OFF, "GL_ATI_texture_env_combine3",       F(ATI_texture_env_combine3)},
 138    { OFF, "GL_ATI_texture_mirror_once",        F(ATI_texture_mirror_once)},
 139    { OFF, "GL_ATI_fragment_shader",            F(ATI_fragment_shader)},
 140    { OFF, "GL_ATI_separate_stencil",           F(ATI_separate_stencil)},
 141    { OFF, "GL_IBM_multimode_draw_arrays",      F(IBM_multimode_draw_arrays) },
 142    { ON,  "GL_IBM_rasterpos_clip",             F(IBM_rasterpos_clip) },
 143    { OFF, "GL_IBM_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
 144    { OFF, "GL_INGR_blend_func_separate",       F(EXT_blend_func_separate) },
 145    { OFF, "GL_MESA_pack_invert",               F(MESA_pack_invert) },
 146    { OFF, "GL_MESA_packed_depth_stencil",      F(MESA_packed_depth_stencil) },
 147    { OFF, "GL_MESA_program_debug",             F(MESA_program_debug) },
 148    { OFF, "GL_MESA_resize_buffers",            F(MESA_resize_buffers) },
 149    { OFF, "GL_MESA_texture_array",             F(MESA_texture_array) },
 150    { OFF, "GL_MESA_ycbcr_texture",             F(MESA_ycbcr_texture) },
 151    { ON,  "GL_MESA_window_pos",                F(ARB_window_pos) },
 152    { OFF, "GL_NV_blend_square",                F(NV_blend_square) },
 153    { OFF, "GL_NV_fragment_program",            F(NV_fragment_program) },
 154    { ON,  "GL_NV_light_max_exponent",          F(NV_light_max_exponent) },
 155    { OFF, "GL_NV_point_sprite",                F(NV_point_sprite) },
 156    { OFF, "GL_NV_texture_rectangle",           F(NV_texture_rectangle) },
 157    { ON,  "GL_NV_texgen_reflection",           F(NV_texgen_reflection) },
 158    { OFF, "GL_NV_vertex_program",              F(NV_vertex_program) },
 159    { OFF, "GL_NV_vertex_program1_1",           F(NV_vertex_program1_1) },
 160    { ON,  "GL_OES_read_format",                F(OES_read_format) },
 161    { OFF, "GL_SGI_color_matrix",               F(SGI_color_matrix) },
 162    { OFF, "GL_SGI_color_table",                F(SGI_color_table) },
 163    { OFF, "GL_SGI_texture_color_table",        F(SGI_texture_color_table) },
 164    { OFF, "GL_SGIS_generate_mipmap",           F(SGIS_generate_mipmap) },
 165    { OFF, "GL_SGIS_texture_border_clamp",      F(ARB_texture_border_clamp) },
 166    { ON,  "GL_SGIS_texture_edge_clamp",        F(SGIS_texture_edge_clamp) },
 167    { ON,  "GL_SGIS_texture_lod",               F(SGIS_texture_lod) },
 168    { OFF, "GL_SGIX_depth_texture",             F(ARB_depth_texture) },
 169    { OFF, "GL_SGIX_shadow",                    F(SGIX_shadow) },
 170    { OFF, "GL_SGIX_shadow_ambient",            F(SGIX_shadow_ambient) },
 171    { OFF, "GL_SUN_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
 172    { OFF, "GL_S3_s3tc",                        F(S3_s3tc) },
 173 };
 174
 175
 176
 177 /**
 178  * Enable all extensions suitable for a software-only renderer.
 179  * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
 180  */
 181 void
 182 _mesa_enable_sw_extensions(GLcontext *ctx)
 183 {
 184    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 185    ctx->Extensions.ARB_draw_buffers = GL_TRUE;
 186 #if FEATURE_ARB_fragment_program
 187    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 188    ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 189 #endif
 190 #if FEATURE_ARB_fragment_shader
 191    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 192 #endif
 193    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 194    ctx->Extensions.ARB_imaging = GL_TRUE;
 195    ctx->Extensions.ARB_multitexture = GL_TRUE;
 196 #if FEATURE_ARB_occlusion_query
 197    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 198 #endif
 199    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 200 #if FEATURE_ARB_shader_objects
 201    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 202 #endif
 203 #if FEATURE_ARB_shading_language_100
 204    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 205 #endif
 206 #if FEATURE_ARB_shading_language_120
 207    ctx->Extensions.ARB_shading_language_120 = GL_FALSE; /* not quite done */
 208 #endif
 209    ctx->Extensions.ARB_shadow = GL_TRUE;
 210    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 211    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 212    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 213    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 214    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 215    /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
 216    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 217    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 218 #if FEATURE_ARB_vertex_program
 219    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 220 #endif
 221 #if FEATURE_ARB_vertex_shader
 222    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 223 #endif
 224 #if FEATURE_ARB_vertex_buffer_object
 225    ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
 226 #endif
 227    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 228 #if FEATURE_ATI_fragment_shader
 229    ctx->Extensions.ATI_fragment_shader = GL_TRUE;
 230 #endif
 231    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 232    ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 233    ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 234    ctx->Extensions.EXT_blend_color = GL_TRUE;
 235    ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 236    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 237    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 238    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 239    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 240    ctx->Extensions.EXT_convolution = GL_TRUE;
 241    ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
 242    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 243 #if FEATURE_EXT_framebuffer_object
 244    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 245 #endif
 246 #if FEATURE_EXT_framebuffer_blit
 247    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 248 #endif
 249    ctx->Extensions.EXT_histogram = GL_TRUE;
 250    ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
 251    ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 252    ctx->Extensions.EXT_paletted_texture = GL_TRUE;
 253 #if FEATURE_EXT_pixel_buffer_object
 254    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 255 #endif
 256    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 257    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 258    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 259    ctx->Extensions.EXT_shared_texture_palette = GL_TRUE;
 260    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 261    ctx->Extensions.EXT_stencil_two_side = GL_FALSE; /* obsolete */
 262    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 263    ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
 264    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 265    ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 266    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 267 #if FEATURE_EXT_texture_sRGB
 268    ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 269 #endif
 270    ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;
 271    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 272 #if FEATURE_MESA_program_debug
 273    ctx->Extensions.MESA_program_debug = GL_TRUE;
 274 #endif
 275    ctx->Extensions.MESA_resize_buffers = GL_TRUE;
 276    ctx->Extensions.MESA_texture_array = GL_TRUE;
 277    ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 278    ctx->Extensions.NV_blend_square = GL_TRUE;
 279    /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
 280    ctx->Extensions.NV_point_sprite = GL_TRUE;
 281    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 282    /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
 283 #if FEATURE_NV_vertex_program
 284    ctx->Extensions.NV_vertex_program = GL_TRUE;
 285    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 286 #endif
 287 #if FEATURE_NV_fragment_program
 288    ctx->Extensions.NV_fragment_program = GL_TRUE;
 289 #endif
 290    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 291    ctx->Extensions.SGI_color_table = GL_TRUE;
 292    ctx->Extensions.SGI_texture_color_table = GL_TRUE;
 293    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 294    ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE;
 295    ctx->Extensions.SGIX_shadow = GL_TRUE;
 296    ctx->Extensions.SGIX_shadow_ambient = GL_TRUE;
 297 #if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program
 298    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 299 #endif
 300 }
 301
 302
 303 /**
 304  * Enable GL_ARB_imaging and all the EXT extensions that are subsets of it.
 305  */
 306 void
 307 _mesa_enable_imaging_extensions(GLcontext *ctx)
 308 {
 309    ctx->Extensions.ARB_imaging = GL_TRUE;
 310    ctx->Extensions.EXT_blend_color = GL_TRUE;
 311    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 312    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 313    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 314    ctx->Extensions.EXT_convolution = GL_TRUE;
 315    ctx->Extensions.EXT_histogram = GL_TRUE;
 316    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 317    ctx->Extensions.SGI_color_table = GL_TRUE;
 318 }
 319
 320
 321
 322 /**
 323  * Enable all OpenGL 1.3 features and extensions.
 324  * A convenience function to be called by drivers.
 325  */
 326 void
 327 _mesa_enable_1_3_extensions(GLcontext *ctx)
 328 {
 329    ctx->Extensions.ARB_multisample = GL_TRUE;
 330    ctx->Extensions.ARB_multitexture = GL_TRUE;
 331    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 332    ctx->Extensions.ARB_texture_compression = GL_TRUE;
 333    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 334    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 335    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 336    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 337    /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
 338 }
 339
 340
 341
 342 /**
 343  * Enable all OpenGL 1.4 features and extensions.
 344  * A convenience function to be called by drivers.
 345  */
 346 void
 347 _mesa_enable_1_4_extensions(GLcontext *ctx)
 348 {
 349    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 350    ctx->Extensions.ARB_shadow = GL_TRUE;
 351    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 352    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 353    ctx->Extensions.ARB_window_pos = GL_TRUE;
 354    ctx->Extensions.EXT_blend_color = GL_TRUE;
 355    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 356    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 357    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 358    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 359    ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
 360    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 361    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 362    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 363    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 364    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 365 }
 366
 367
 368 /**
 369  * Enable all OpenGL 1.5 features and extensions.
 370  * A convenience function to be called by drivers.
 371  */
 372 void
 373 _mesa_enable_1_5_extensions(GLcontext *ctx)
 374 {
 375    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 376    ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
 377    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 378 }
 379
 380
 381 /**
 382  * Enable all OpenGL 2.0 features and extensions.
 383  * A convenience function to be called by drivers.
 384  */
 385 void
 386 _mesa_enable_2_0_extensions(GLcontext *ctx)
 387 {
 388    ctx->Extensions.ARB_draw_buffers = GL_TRUE;
 389 #if FEATURE_ARB_fragment_shader
 390    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 391 #endif
 392    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 393    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 394 #if FEATURE_ARB_shader_objects
 395    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 396 #endif
 397 #if FEATURE_ARB_shading_language_100
 398    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 399 #endif
 400    ctx->Extensions.EXT_stencil_two_side = GL_FALSE; /* obsolete */
 401 #if FEATURE_ARB_vertex_shader
 402    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 403 #endif
 404 }
 405
 406
 407 /**
 408  * Enable all OpenGL 2.1 features and extensions.
 409  * A convenience function to be called by drivers.
 410  */
 411 void
 412 _mesa_enable_2_1_extensions(GLcontext *ctx)
 413 {
 414 #if FEATURE_EXT_pixel_buffer_object
 415    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 416 #endif
 417 #if FEATURE_EXT_texture_sRGB
 418    ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 419 #endif
 420 #ifdef FEATURE_ARB_shading_language_120
 421    ctx->Extensions.ARB_shading_language_120 = GL_FALSE; /* not quite done */
 422 #endif
 423 }
 424
 425
 426
 427 /**
 428  * Either enable or disable the named extension.
 429  */
 430 static void
 431 set_extension( GLcontext *ctx, const char *name, GLboolean state )
 432 {
 433    GLboolean *base = (GLboolean *) &ctx->Extensions;
 434    GLuint i;
 435
 436    if (ctx->Extensions.String) {
 437       /* The string was already queried - can't change it now! */
 438       _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
 439       return;
 440    }
 441
 442    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 443       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 444          if (default_extensions[i].flag_offset) {
 445             GLboolean *enabled = base + default_extensions[i].flag_offset;
 446             *enabled = state;
 447          }
 448          return;
 449       }
 450    }
 451    _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
 452 }
 453
 454
 455 /**
 456  * Enable the named extension.
 457  * Typically called by drivers.
 458  */
 459 void
 460 _mesa_enable_extension( GLcontext *ctx, const char *name )
 461 {
 462    set_extension(ctx, name, GL_TRUE);
 463 }
 464
 465
 466 /**
 467  * Disable the named extension.
 468  * XXX is this really needed???
 469  */
 470 void
 471 _mesa_disable_extension( GLcontext *ctx, const char *name )
 472 {
 473    set_extension(ctx, name, GL_FALSE);
 474 }
 475
 476
 477 /**
 478  * Test if the named extension is enabled in this context.
 479  */
 480 GLboolean
 481 _mesa_extension_is_enabled( GLcontext *ctx, const char *name )
 482 {
 483    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 484    GLuint i;
 485
 486    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 487       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 488          if (!default_extensions[i].flag_offset)
 489             return GL_TRUE;
 490          return *(base + default_extensions[i].flag_offset);
 491       }
 492    }
 493    return GL_FALSE;
 494 }
 495
 496
 497 /**
 498  * Run through the default_extensions array above and set the
 499  * ctx->Extensions.ARB/EXT_* flags accordingly.
 500  * To be called during context initialization.
 501  */
 502 void
 503 _mesa_init_extensions( GLcontext *ctx )
 504 {
 505    GLboolean *base = (GLboolean *) &ctx->Extensions;
 506    GLuint i;
 507
 508    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 509       if (default_extensions[i].enabled &&
 510           default_extensions[i].flag_offset) {
 511          *(base + default_extensions[i].flag_offset) = GL_TRUE;
 512       }
 513    }
 514 }
 515
 516
 517 /**
 518  * Construct the GL_EXTENSIONS string.  Called the first time that
 519  * glGetString(GL_EXTENSIONS) is called.
 520  */
 521 GLubyte *
 522 _mesa_make_extension_string( GLcontext *ctx )
 523 {
 524    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 525    GLuint extStrLen = 0;
 526    GLubyte *s;
 527    GLuint i;
 528
 529    /* first, compute length of the extension string */
 530    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 531       if (!default_extensions[i].flag_offset ||
 532           *(base + default_extensions[i].flag_offset)) {
 533          extStrLen += (GLuint)_mesa_strlen(default_extensions[i].name) + 1;
 534       }
 535    }
 536    s = (GLubyte *) _mesa_malloc(extStrLen);
 537
 538    /* second, build the extension string */
 539    extStrLen = 0;
 540    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 541       if (!default_extensions[i].flag_offset ||
 542           *(base + default_extensions[i].flag_offset)) {
 543          GLuint len = (GLuint)_mesa_strlen(default_extensions[i].name);
 544          _mesa_memcpy(s + extStrLen, default_extensions[i].name, len);
 545          extStrLen += len;
 546          s[extStrLen] = (GLubyte) ' ';
 547          extStrLen++;
 548       }
 549    }
 550    ASSERT(extStrLen > 0);
 551
 552    s[extStrLen - 1] = 0;
 553
 554    return s;
 555 }