src/mesa/main/extensions.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.3
   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    { ON,  "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_framebuffer_object",         F(ARB_framebuffer_object) },
  53    { OFF, "GL_ARB_half_float_pixel",           F(ARB_half_float_pixel) },
  54    { OFF, "GL_ARB_imaging",                    F(ARB_imaging) },
  55    { ON,  "GL_ARB_multisample",                F(ARB_multisample) },
  56    { OFF, "GL_ARB_multitexture",               F(ARB_multitexture) },
  57    { OFF, "GL_ARB_occlusion_query",            F(ARB_occlusion_query) },
  58    { OFF, "GL_ARB_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
  59    { OFF, "GL_ARB_point_parameters",           F(EXT_point_parameters) },
  60    { OFF, "GL_ARB_point_sprite",               F(ARB_point_sprite) },
  61    { OFF, "GL_ARB_shader_objects",             F(ARB_shader_objects) },
  62    { OFF, "GL_ARB_shading_language_100",       F(ARB_shading_language_100) },
  63    { OFF, "GL_ARB_shading_language_120",       F(ARB_shading_language_120) },
  64    { OFF, "GL_ARB_shadow",                     F(ARB_shadow) },
  65    { OFF, "GL_ARB_shadow_ambient",             F(ARB_shadow_ambient) },
  66    { OFF, "GL_ARB_texture_border_clamp",       F(ARB_texture_border_clamp) },
  67    { ON,  "GL_ARB_texture_compression",        F(ARB_texture_compression) },
  68    { OFF, "GL_ARB_texture_cube_map",           F(ARB_texture_cube_map) },
  69    { OFF, "GL_ARB_texture_env_add",            F(EXT_texture_env_add) },
  70    { OFF, "GL_ARB_texture_env_combine",        F(ARB_texture_env_combine) },
  71    { OFF, "GL_ARB_texture_env_crossbar",       F(ARB_texture_env_crossbar) },
  72    { OFF, "GL_ARB_texture_env_dot3",           F(ARB_texture_env_dot3) },
  73    { OFF, "GL_MESAX_texture_float",            F(ARB_texture_float) },
  74    { OFF, "GL_ARB_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
  75    { OFF, "GL_ARB_texture_non_power_of_two",   F(ARB_texture_non_power_of_two)},
  76    { OFF, "GL_ARB_texture_rectangle",          F(NV_texture_rectangle) },
  77    { ON,  "GL_ARB_transpose_matrix",           F(ARB_transpose_matrix) },
  78    { ON,  "GL_ARB_vertex_buffer_object",       F(ARB_vertex_buffer_object) },
  79    { OFF, "GL_ARB_vertex_program",             F(ARB_vertex_program) },
  80    { OFF, "GL_ARB_vertex_shader",              F(ARB_vertex_shader) },
  81    { ON,  "GL_ARB_window_pos",                 F(ARB_window_pos) },
  82    { ON,  "GL_EXT_abgr",                       F(EXT_abgr) },
  83    { ON,  "GL_EXT_bgra",                       F(EXT_bgra) },
  84    { OFF, "GL_EXT_blend_color",                F(EXT_blend_color) },
  85    { OFF, "GL_EXT_blend_equation_separate",    F(EXT_blend_equation_separate) },
  86    { OFF, "GL_EXT_blend_func_separate",        F(EXT_blend_func_separate) },
  87    { OFF, "GL_EXT_blend_logic_op",             F(EXT_blend_logic_op) },
  88    { OFF, "GL_EXT_blend_minmax",               F(EXT_blend_minmax) },
  89    { OFF, "GL_EXT_blend_subtract",             F(EXT_blend_subtract) },
  90    { OFF, "GL_EXT_clip_volume_hint",           F(EXT_clip_volume_hint) },
  91    { OFF, "GL_EXT_cull_vertex",                F(EXT_cull_vertex) },
  92    { ON,  "GL_EXT_compiled_vertex_array",      F(EXT_compiled_vertex_array) },
  93    { OFF, "GL_EXT_convolution",                F(EXT_convolution) },
  94    { ON,  "GL_EXT_copy_texture",               F(EXT_copy_texture) },
  95    { OFF, "GL_EXT_depth_bounds_test",          F(EXT_depth_bounds_test) },
  96    { ON,  "GL_EXT_draw_range_elements",        F(EXT_draw_range_elements) },
  97    { OFF, "GL_EXT_framebuffer_object",         F(EXT_framebuffer_object) },
  98    { OFF, "GL_EXT_framebuffer_blit",           F(EXT_framebuffer_blit) },
  99    { OFF, "GL_EXT_fog_coord",                  F(EXT_fog_coord) },
 100    { OFF, "GL_EXT_gpu_program_parameters",     F(EXT_gpu_program_parameters) },
 101    { OFF, "GL_EXT_histogram",                  F(EXT_histogram) },
 102    { ON,  "GL_EXT_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
 103    { OFF, "GL_EXT_packed_depth_stencil",       F(EXT_packed_depth_stencil) },
 104    { ON,  "GL_EXT_packed_pixels",              F(EXT_packed_pixels) },
 105    { OFF, "GL_EXT_paletted_texture",           F(EXT_paletted_texture) },
 106    { OFF, "GL_EXT_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
 107    { OFF, "GL_EXT_point_parameters",           F(EXT_point_parameters) },
 108    { ON,  "GL_EXT_polygon_offset",             F(EXT_polygon_offset) },
 109    { ON,  "GL_EXT_rescale_normal",             F(EXT_rescale_normal) },
 110    { OFF, "GL_EXT_secondary_color",            F(EXT_secondary_color) },
 111    { ON,  "GL_EXT_separate_specular_color",    F(EXT_separate_specular_color) },
 112    { OFF, "GL_EXT_shadow_funcs",               F(EXT_shadow_funcs) },
 113    { OFF, "GL_EXT_shared_texture_palette",     F(EXT_shared_texture_palette) },
 114    { OFF, "GL_EXT_stencil_two_side",           F(EXT_stencil_two_side) },
 115    { OFF, "GL_EXT_stencil_wrap",               F(EXT_stencil_wrap) },
 116    { ON,  "GL_EXT_subtexture",                 F(EXT_subtexture) },
 117    { ON,  "GL_EXT_texture",                    F(EXT_texture) },
 118    { ON,  "GL_EXT_texture3D",                  F(EXT_texture3D) },
 119    { OFF, "GL_EXT_texture_compression_s3tc",   F(EXT_texture_compression_s3tc) },
 120    { ON,  "GL_EXT_texture_edge_clamp",         F(SGIS_texture_edge_clamp) },
 121    { OFF, "GL_EXT_texture_env_add",            F(EXT_texture_env_add) },
 122    { OFF, "GL_EXT_texture_env_combine",        F(EXT_texture_env_combine) },
 123    { OFF, "GL_EXT_texture_env_dot3",           F(EXT_texture_env_dot3) },
 124    { OFF, "GL_EXT_texture_filter_anisotropic", F(EXT_texture_filter_anisotropic) },
 125    { OFF, "GL_EXT_texture_lod_bias",           F(EXT_texture_lod_bias) },
 126    { OFF, "GL_EXT_texture_mirror_clamp",       F(EXT_texture_mirror_clamp) },
 127    { ON,  "GL_EXT_texture_object",             F(EXT_texture_object) },
 128    { OFF, "GL_EXT_texture_rectangle",          F(NV_texture_rectangle) },
 129    { OFF, "GL_EXT_texture_sRGB",               F(EXT_texture_sRGB) },
 130    { OFF, "GL_EXT_texture_swizzle",            F(EXT_texture_swizzle) },
 131    { OFF, "GL_EXT_timer_query",                F(EXT_timer_query) },
 132    { ON,  "GL_EXT_vertex_array",               F(EXT_vertex_array) },
 133    { OFF, "GL_EXT_vertex_array_bgra",          F(EXT_vertex_array_bgra) },
 134    { OFF, "GL_EXT_vertex_array_set",           F(EXT_vertex_array_set) },
 135    { OFF, "GL_3DFX_texture_compression_FXT1",  F(TDFX_texture_compression_FXT1) },
 136    { OFF, "GL_APPLE_client_storage",           F(APPLE_client_storage) },
 137    { ON,  "GL_APPLE_packed_pixels",            F(APPLE_packed_pixels) },
 138    { OFF, "GL_APPLE_vertex_array_object",      F(APPLE_vertex_array_object) },
 139    { OFF, "GL_ATI_blend_equation_separate",    F(EXT_blend_equation_separate) },
 140    { OFF, "GL_ATI_envmap_bumpmap",             F(ATI_envmap_bumpmap) },
 141    { OFF, "GL_ATI_texture_env_combine3",       F(ATI_texture_env_combine3)},
 142    { OFF, "GL_ATI_texture_mirror_once",        F(ATI_texture_mirror_once)},
 143    { OFF, "GL_ATI_fragment_shader",            F(ATI_fragment_shader)},
 144    { OFF, "GL_ATI_separate_stencil",           F(ATI_separate_stencil)},
 145    { ON,  "GL_IBM_multimode_draw_arrays",      F(IBM_multimode_draw_arrays) },
 146    { ON,  "GL_IBM_rasterpos_clip",             F(IBM_rasterpos_clip) },
 147    { OFF, "GL_IBM_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
 148    { OFF, "GL_INGR_blend_func_separate",       F(EXT_blend_func_separate) },
 149    { OFF, "GL_MESA_pack_invert",               F(MESA_pack_invert) },
 150    { OFF, "GL_MESA_packed_depth_stencil",      F(MESA_packed_depth_stencil) },
 151    { OFF, "GL_MESA_resize_buffers",            F(MESA_resize_buffers) },
 152    { OFF, "GL_MESA_texture_array",             F(MESA_texture_array) },
 153    { OFF, "GL_MESA_ycbcr_texture",             F(MESA_ycbcr_texture) },
 154    { ON,  "GL_MESA_window_pos",                F(ARB_window_pos) },
 155    { OFF, "GL_NV_blend_square",                F(NV_blend_square) },
 156    { OFF, "GL_NV_fragment_program",            F(NV_fragment_program) },
 157    { ON,  "GL_NV_light_max_exponent",          F(NV_light_max_exponent) },
 158    { OFF, "GL_NV_point_sprite",                F(NV_point_sprite) },
 159    { OFF, "GL_NV_texture_env_combine4",        F(NV_texture_env_combine4) },
 160    { OFF, "GL_NV_texture_rectangle",           F(NV_texture_rectangle) },
 161    { ON,  "GL_NV_texgen_reflection",           F(NV_texgen_reflection) },
 162    { OFF, "GL_NV_vertex_program",              F(NV_vertex_program) },
 163    { OFF, "GL_NV_vertex_program1_1",           F(NV_vertex_program1_1) },
 164    { ON,  "GL_OES_read_format",                F(OES_read_format) },
 165    { OFF, "GL_SGI_color_matrix",               F(SGI_color_matrix) },
 166    { OFF, "GL_SGI_color_table",                F(SGI_color_table) },
 167    { OFF, "GL_SGI_texture_color_table",        F(SGI_texture_color_table) },
 168    { OFF, "GL_SGIS_generate_mipmap",           F(SGIS_generate_mipmap) },
 169    { OFF, "GL_SGIS_texture_border_clamp",      F(ARB_texture_border_clamp) },
 170    { ON,  "GL_SGIS_texture_edge_clamp",        F(SGIS_texture_edge_clamp) },
 171    { ON,  "GL_SGIS_texture_lod",               F(SGIS_texture_lod) },
 172    { ON,  "GL_SUN_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
 173    { OFF, "GL_S3_s3tc",                        F(S3_s3tc) },
 174 };
 175
 176
 177
 178 /**
 179  * Enable all extensions suitable for a software-only renderer.
 180  * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
 181  */
 182 void
 183 _mesa_enable_sw_extensions(GLcontext *ctx)
 184 {
 185    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 186    /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
 187 #if FEATURE_ARB_fragment_program
 188    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 189    ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 190 #endif
 191 #if FEATURE_ARB_fragment_shader
 192    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 193 #endif
 194 #if FEATURE_ARB_framebuffer_object
 195    ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 196 #endif
 197    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 198    ctx->Extensions.ARB_imaging = GL_TRUE;
 199    ctx->Extensions.ARB_multitexture = GL_TRUE;
 200 #if FEATURE_ARB_occlusion_query
 201    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 202 #endif
 203    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 204 #if FEATURE_ARB_shader_objects
 205    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 206 #endif
 207 #if FEATURE_ARB_shading_language_100
 208    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 209 #endif
 210 #if FEATURE_ARB_shading_language_120
 211    ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
 212 #endif
 213    ctx->Extensions.ARB_shadow = GL_TRUE;
 214    ctx->Extensions.ARB_shadow_ambient = GL_TRUE;
 215    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 216    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 217    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 218    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 219    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 220    /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
 221    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 222    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 223 #if FEATURE_ARB_vertex_program
 224    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 225 #endif
 226 #if FEATURE_ARB_vertex_shader
 227    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 228 #endif
 229 #if FEATURE_ARB_vertex_buffer_object
 230    /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
 231 #endif
 232    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 233    ctx->Extensions.ATI_envmap_bumpmap = GL_TRUE;
 234 #if FEATURE_ATI_fragment_shader
 235    ctx->Extensions.ATI_fragment_shader = GL_TRUE;
 236 #endif
 237    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 238    ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 239    ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 240    ctx->Extensions.EXT_blend_color = GL_TRUE;
 241    ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 242    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 243    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 244    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 245    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 246    ctx->Extensions.EXT_convolution = GL_TRUE;
 247    ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
 248    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 249 #if FEATURE_EXT_framebuffer_object
 250    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 251 #endif
 252 #if FEATURE_EXT_framebuffer_blit
 253    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 254 #endif
 255    ctx->Extensions.EXT_histogram = GL_TRUE;
 256    /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
 257    ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 258    ctx->Extensions.EXT_paletted_texture = GL_TRUE;
 259 #if FEATURE_EXT_pixel_buffer_object
 260    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 261 #endif
 262    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 263    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 264    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 265    ctx->Extensions.EXT_shared_texture_palette = GL_TRUE;
 266    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 267    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 268    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 269    ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
 270    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 271    ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 272    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 273 #if FEATURE_EXT_texture_sRGB
 274    ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 275 #endif
 276    ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 277    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 278    /*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/
 279    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 280    ctx->Extensions.MESA_resize_buffers = GL_TRUE;
 281    ctx->Extensions.MESA_texture_array = GL_TRUE;
 282    ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 283    ctx->Extensions.NV_blend_square = GL_TRUE;
 284    /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
 285    ctx->Extensions.NV_point_sprite = GL_TRUE;
 286    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 287    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 288    /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
 289 #if FEATURE_NV_vertex_program
 290    ctx->Extensions.NV_vertex_program = GL_TRUE;
 291    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 292 #endif
 293 #if FEATURE_NV_fragment_program
 294    ctx->Extensions.NV_fragment_program = GL_TRUE;
 295 #endif
 296    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 297    ctx->Extensions.SGI_color_table = GL_TRUE;
 298    ctx->Extensions.SGI_texture_color_table = GL_TRUE;
 299    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 300    ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE;
 301 #if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program
 302    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 303 #endif
 304 #if FEATURE_texture_fxt1
 305    _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1");
 306 #endif
 307 #if FEATURE_texture_s3tc
 308    if (ctx->Mesa_DXTn) {
 309       _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
 310       _mesa_enable_extension(ctx, "GL_S3_s3tc");
 311    }
 312 #endif
 313 }
 314
 315
 316 /**
 317  * Enable GL_ARB_imaging and all the EXT extensions that are subsets of it.
 318  */
 319 void
 320 _mesa_enable_imaging_extensions(GLcontext *ctx)
 321 {
 322    ctx->Extensions.ARB_imaging = GL_TRUE;
 323    ctx->Extensions.EXT_blend_color = GL_TRUE;
 324    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 325    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 326    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 327    ctx->Extensions.EXT_convolution = GL_TRUE;
 328    ctx->Extensions.EXT_histogram = GL_TRUE;
 329    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 330    ctx->Extensions.SGI_color_table = GL_TRUE;
 331 }
 332
 333
 334
 335 /**
 336  * Enable all OpenGL 1.3 features and extensions.
 337  * A convenience function to be called by drivers.
 338  */
 339 void
 340 _mesa_enable_1_3_extensions(GLcontext *ctx)
 341 {
 342    /*ctx->Extensions.ARB_multisample = GL_TRUE;*/
 343    ctx->Extensions.ARB_multitexture = GL_TRUE;
 344    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 345    /*ctx->Extensions.ARB_texture_compression = GL_TRUE;*/
 346    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 347    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 348    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 349    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 350    /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
 351 }
 352
 353
 354
 355 /**
 356  * Enable all OpenGL 1.4 features and extensions.
 357  * A convenience function to be called by drivers.
 358  */
 359 void
 360 _mesa_enable_1_4_extensions(GLcontext *ctx)
 361 {
 362    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 363    ctx->Extensions.ARB_shadow = GL_TRUE;
 364    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 365    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 366    ctx->Extensions.ARB_window_pos = GL_TRUE;
 367    ctx->Extensions.EXT_blend_color = GL_TRUE;
 368    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 369    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 370    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 371    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 372    /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
 373    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 374    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 375    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 376    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 377    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 378 }
 379
 380
 381 /**
 382  * Enable all OpenGL 1.5 features and extensions.
 383  * A convenience function to be called by drivers.
 384  */
 385 void
 386 _mesa_enable_1_5_extensions(GLcontext *ctx)
 387 {
 388    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 389    /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
 390    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 391 }
 392
 393
 394 /**
 395  * Enable all OpenGL 2.0 features and extensions.
 396  * A convenience function to be called by drivers.
 397  */
 398 void
 399 _mesa_enable_2_0_extensions(GLcontext *ctx)
 400 {
 401    /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
 402 #if FEATURE_ARB_fragment_shader
 403    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 404 #endif
 405    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 406    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 407 #if FEATURE_ARB_shader_objects
 408    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 409 #endif
 410 #if FEATURE_ARB_shading_language_100
 411    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 412 #endif
 413    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 414 #if FEATURE_ARB_vertex_shader
 415    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 416 #endif
 417 }
 418
 419
 420 /**
 421  * Enable all OpenGL 2.1 features and extensions.
 422  * A convenience function to be called by drivers.
 423  */
 424 void
 425 _mesa_enable_2_1_extensions(GLcontext *ctx)
 426 {
 427 #if FEATURE_EXT_pixel_buffer_object
 428    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 429 #endif
 430 #if FEATURE_EXT_texture_sRGB
 431    ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 432 #endif
 433 #ifdef FEATURE_ARB_shading_language_120
 434    ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
 435 #endif
 436 }
 437
 438
 439
 440 /**
 441  * Either enable or disable the named extension.
 442  */
 443 static void
 444 set_extension( GLcontext *ctx, const char *name, GLboolean state )
 445 {
 446    GLboolean *base = (GLboolean *) &ctx->Extensions;
 447    GLuint i;
 448
 449    if (ctx->Extensions.String) {
 450       /* The string was already queried - can't change it now! */
 451       _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
 452       return;
 453    }
 454
 455    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 456       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 457          if (default_extensions[i].flag_offset) {
 458             GLboolean *enabled = base + default_extensions[i].flag_offset;
 459             *enabled = state;
 460          }
 461          return;
 462       }
 463    }
 464    _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
 465 }
 466
 467
 468 /**
 469  * Enable the named extension.
 470  * Typically called by drivers.
 471  */
 472 void
 473 _mesa_enable_extension( GLcontext *ctx, const char *name )
 474 {
 475    set_extension(ctx, name, GL_TRUE);
 476 }
 477
 478
 479 /**
 480  * Disable the named extension.
 481  * XXX is this really needed???
 482  */
 483 void
 484 _mesa_disable_extension( GLcontext *ctx, const char *name )
 485 {
 486    set_extension(ctx, name, GL_FALSE);
 487 }
 488
 489
 490 /**
 491  * Test if the named extension is enabled in this context.
 492  */
 493 GLboolean
 494 _mesa_extension_is_enabled( GLcontext *ctx, const char *name )
 495 {
 496    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 497    GLuint i;
 498
 499    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 500       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 501          if (!default_extensions[i].flag_offset)
 502             return GL_TRUE;
 503          return *(base + default_extensions[i].flag_offset);
 504       }
 505    }
 506    return GL_FALSE;
 507 }
 508
 509
 510 /**
 511  * Run through the default_extensions array above and set the
 512  * ctx->Extensions.ARB/EXT_* flags accordingly.
 513  * To be called during context initialization.
 514  */
 515 void
 516 _mesa_init_extensions( GLcontext *ctx )
 517 {
 518    GLboolean *base = (GLboolean *) &ctx->Extensions;
 519    GLuint i;
 520
 521    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 522       if (default_extensions[i].enabled &&
 523           default_extensions[i].flag_offset) {
 524          *(base + default_extensions[i].flag_offset) = GL_TRUE;
 525       }
 526    }
 527 }
 528
 529
 530 /**
 531  * Construct the GL_EXTENSIONS string.  Called the first time that
 532  * glGetString(GL_EXTENSIONS) is called.
 533  */
 534 GLubyte *
 535 _mesa_make_extension_string( GLcontext *ctx )
 536 {
 537    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 538    GLuint extStrLen = 0;
 539    GLubyte *s;
 540    GLuint i;
 541
 542    /* first, compute length of the extension string */
 543    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 544       if (!default_extensions[i].flag_offset ||
 545           *(base + default_extensions[i].flag_offset)) {
 546          extStrLen += (GLuint)_mesa_strlen(default_extensions[i].name) + 1;
 547       }
 548    }
 549    s = (GLubyte *) _mesa_malloc(extStrLen);
 550
 551    /* second, build the extension string */
 552    extStrLen = 0;
 553    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 554       if (!default_extensions[i].flag_offset ||
 555           *(base + default_extensions[i].flag_offset)) {
 556          GLuint len = (GLuint)_mesa_strlen(default_extensions[i].name);
 557          _mesa_memcpy(s + extStrLen, default_extensions[i].name, len);
 558          extStrLen += len;
 559          s[extStrLen] = (GLubyte) ' ';
 560          extStrLen++;
 561       }
 562    }
 563    ASSERT(extStrLen > 0);
 564
 565    s[extStrLen - 1] = 0;
 566
 567    return s;
 568 }