src/mesa/main/extensions.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.6
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 #include "glheader.h"
  28 #include "imports.h"
  29 #include "context.h"
  30 #include "extensions.h"
  31 #include "simple_list.h"
  32 #include "mtypes.h"
  33
  34
  35 #define F(x) offsetof(struct gl_extensions, x)
  36 #define ON GL_TRUE
  37 #define OFF GL_FALSE
  38
  39
  40 /*
  41  * Note: The GL_MESAX_* extensions are placeholders for future ARB extensions.
  42  */
  43 static const struct {
  44    GLboolean enabled;
  45    const char *name;
  46    int flag_offset;
  47 } default_extensions[] = {
  48    { OFF, "GL_ARB_copy_buffer",                F(ARB_copy_buffer) },
  49    { OFF, "GL_ARB_depth_texture",              F(ARB_depth_texture) },
  50    { ON,  "GL_ARB_draw_buffers",               F(ARB_draw_buffers) },
  51    { OFF, "GL_ARB_fragment_program",           F(ARB_fragment_program) },
  52    { OFF, "GL_ARB_fragment_program_shadow",    F(ARB_fragment_program_shadow) },
  53    { OFF, "GL_ARB_fragment_shader",            F(ARB_fragment_shader) },
  54    { OFF, "GL_ARB_framebuffer_object",         F(ARB_framebuffer_object) },
  55    { OFF, "GL_ARB_half_float_pixel",           F(ARB_half_float_pixel) },
  56    { OFF, "GL_ARB_imaging",                    F(ARB_imaging) },
  57    { OFF, "GL_ARB_map_buffer_range",           F(ARB_map_buffer_range) },
  58    { ON,  "GL_ARB_multisample",                F(ARB_multisample) },
  59    { OFF, "GL_ARB_multitexture",               F(ARB_multitexture) },
  60    { OFF, "GL_ARB_occlusion_query",            F(ARB_occlusion_query) },
  61    { OFF, "GL_ARB_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
  62    { OFF, "GL_ARB_point_parameters",           F(EXT_point_parameters) },
  63    { OFF, "GL_ARB_point_sprite",               F(ARB_point_sprite) },
  64    { OFF, "GL_ARB_seamless_cube_map",          F(ARB_seamless_cube_map) },
  65    { OFF, "GL_ARB_shader_objects",             F(ARB_shader_objects) },
  66    { OFF, "GL_ARB_shading_language_100",       F(ARB_shading_language_100) },
  67    { OFF, "GL_ARB_shading_language_120",       F(ARB_shading_language_120) },
  68    { OFF, "GL_ARB_shadow",                     F(ARB_shadow) },
  69    { OFF, "GL_ARB_shadow_ambient",             F(ARB_shadow_ambient) },
  70    { OFF, "GL_ARB_sync",                       F(ARB_sync) },
  71    { OFF, "GL_ARB_texture_border_clamp",       F(ARB_texture_border_clamp) },
  72    { ON,  "GL_ARB_texture_compression",        F(ARB_texture_compression) },
  73    { OFF, "GL_ARB_texture_cube_map",           F(ARB_texture_cube_map) },
  74    { OFF, "GL_ARB_texture_env_add",            F(EXT_texture_env_add) },
  75    { OFF, "GL_ARB_texture_env_combine",        F(ARB_texture_env_combine) },
  76    { OFF, "GL_ARB_texture_env_crossbar",       F(ARB_texture_env_crossbar) },
  77    { OFF, "GL_ARB_texture_env_dot3",           F(ARB_texture_env_dot3) },
  78    { OFF, "GL_MESAX_texture_float",            F(ARB_texture_float) },
  79    { OFF, "GL_ARB_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
  80    { OFF, "GL_ARB_texture_non_power_of_two",   F(ARB_texture_non_power_of_two)},
  81    { OFF, "GL_ARB_texture_rectangle",          F(NV_texture_rectangle) },
  82    { ON,  "GL_ARB_transpose_matrix",           F(ARB_transpose_matrix) },
  83    { OFF, "GL_ARB_vertex_array_bgra",          F(EXT_vertex_array_bgra) },
  84    { OFF, "GL_ARB_vertex_array_object",        F(ARB_vertex_array_object) },
  85    { ON,  "GL_ARB_vertex_buffer_object",       F(ARB_vertex_buffer_object) },
  86    { OFF, "GL_ARB_vertex_program",             F(ARB_vertex_program) },
  87    { OFF, "GL_ARB_vertex_shader",              F(ARB_vertex_shader) },
  88    { ON,  "GL_ARB_window_pos",                 F(ARB_window_pos) },
  89    { ON,  "GL_EXT_abgr",                       F(EXT_abgr) },
  90    { ON,  "GL_EXT_bgra",                       F(EXT_bgra) },
  91    { OFF, "GL_EXT_blend_color",                F(EXT_blend_color) },
  92    { OFF, "GL_EXT_blend_equation_separate",    F(EXT_blend_equation_separate) },
  93    { OFF, "GL_EXT_blend_func_separate",        F(EXT_blend_func_separate) },
  94    { OFF, "GL_EXT_blend_logic_op",             F(EXT_blend_logic_op) },
  95    { OFF, "GL_EXT_blend_minmax",               F(EXT_blend_minmax) },
  96    { OFF, "GL_EXT_blend_subtract",             F(EXT_blend_subtract) },
  97    { OFF, "GL_EXT_clip_volume_hint",           F(EXT_clip_volume_hint) },
  98    { OFF, "GL_EXT_cull_vertex",                F(EXT_cull_vertex) },
  99    { ON,  "GL_EXT_compiled_vertex_array",      F(EXT_compiled_vertex_array) },
 100    { OFF, "GL_EXT_convolution",                F(EXT_convolution) },
 101    { ON,  "GL_EXT_copy_texture",               F(EXT_copy_texture) },
 102    { OFF, "GL_EXT_depth_bounds_test",          F(EXT_depth_bounds_test) },
 103    { ON,  "GL_EXT_draw_range_elements",        F(EXT_draw_range_elements) },
 104    { OFF, "GL_EXT_framebuffer_object",         F(EXT_framebuffer_object) },
 105    { OFF, "GL_EXT_framebuffer_blit",           F(EXT_framebuffer_blit) },
 106    { OFF, "GL_EXT_fog_coord",                  F(EXT_fog_coord) },
 107    { OFF, "GL_EXT_gpu_program_parameters",     F(EXT_gpu_program_parameters) },
 108    { OFF, "GL_EXT_histogram",                  F(EXT_histogram) },
 109    { ON,  "GL_EXT_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
 110    { OFF, "GL_EXT_packed_depth_stencil",       F(EXT_packed_depth_stencil) },
 111    { ON,  "GL_EXT_packed_pixels",              F(EXT_packed_pixels) },
 112    { OFF, "GL_EXT_paletted_texture",           F(EXT_paletted_texture) },
 113    { OFF, "GL_EXT_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
 114    { OFF, "GL_EXT_point_parameters",           F(EXT_point_parameters) },
 115    { ON,  "GL_EXT_polygon_offset",             F(EXT_polygon_offset) },
 116    { OFF, "GL_EXT_provoking_vertex",           F(EXT_provoking_vertex) },
 117    { ON,  "GL_EXT_rescale_normal",             F(EXT_rescale_normal) },
 118    { OFF, "GL_EXT_secondary_color",            F(EXT_secondary_color) },
 119    { ON,  "GL_EXT_separate_specular_color",    F(EXT_separate_specular_color) },
 120    { OFF, "GL_EXT_shadow_funcs",               F(EXT_shadow_funcs) },
 121    { OFF, "GL_EXT_shared_texture_palette",     F(EXT_shared_texture_palette) },
 122    { OFF, "GL_EXT_stencil_two_side",           F(EXT_stencil_two_side) },
 123    { OFF, "GL_EXT_stencil_wrap",               F(EXT_stencil_wrap) },
 124    { ON,  "GL_EXT_subtexture",                 F(EXT_subtexture) },
 125    { ON,  "GL_EXT_texture",                    F(EXT_texture) },
 126    { ON,  "GL_EXT_texture3D",                  F(EXT_texture3D) },
 127    { OFF, "GL_EXT_texture_compression_s3tc",   F(EXT_texture_compression_s3tc) },
 128    { ON,  "GL_EXT_texture_edge_clamp",         F(SGIS_texture_edge_clamp) },
 129    { OFF, "GL_EXT_texture_env_add",            F(EXT_texture_env_add) },
 130    { OFF, "GL_EXT_texture_env_combine",        F(EXT_texture_env_combine) },
 131    { OFF, "GL_EXT_texture_env_dot3",           F(EXT_texture_env_dot3) },
 132    { OFF, "GL_EXT_texture_filter_anisotropic", F(EXT_texture_filter_anisotropic) },
 133    { OFF, "GL_EXT_texture_lod_bias",           F(EXT_texture_lod_bias) },
 134    { OFF, "GL_EXT_texture_mirror_clamp",       F(EXT_texture_mirror_clamp) },
 135    { ON,  "GL_EXT_texture_object",             F(EXT_texture_object) },
 136    { OFF, "GL_EXT_texture_rectangle",          F(NV_texture_rectangle) },
 137    { OFF, "GL_EXT_texture_sRGB",               F(EXT_texture_sRGB) },
 138    { OFF, "GL_EXT_texture_swizzle",            F(EXT_texture_swizzle) },
 139    { OFF, "GL_EXT_timer_query",                F(EXT_timer_query) },
 140    { ON,  "GL_EXT_vertex_array",               F(EXT_vertex_array) },
 141    { OFF, "GL_EXT_vertex_array_bgra",          F(EXT_vertex_array_bgra) },
 142    { OFF, "GL_EXT_vertex_array_set",           F(EXT_vertex_array_set) },
 143    { OFF, "GL_3DFX_texture_compression_FXT1",  F(TDFX_texture_compression_FXT1) },
 144    { OFF, "GL_APPLE_client_storage",           F(APPLE_client_storage) },
 145    { ON,  "GL_APPLE_packed_pixels",            F(APPLE_packed_pixels) },
 146    { OFF, "GL_APPLE_vertex_array_object",      F(APPLE_vertex_array_object) },
 147    { OFF, "GL_ATI_blend_equation_separate",    F(EXT_blend_equation_separate) },
 148    { OFF, "GL_ATI_envmap_bumpmap",             F(ATI_envmap_bumpmap) },
 149    { OFF, "GL_ATI_texture_env_combine3",       F(ATI_texture_env_combine3)},
 150    { OFF, "GL_ATI_texture_mirror_once",        F(ATI_texture_mirror_once)},
 151    { OFF, "GL_ATI_fragment_shader",            F(ATI_fragment_shader)},
 152    { OFF, "GL_ATI_separate_stencil",           F(ATI_separate_stencil)},
 153    { ON,  "GL_IBM_multimode_draw_arrays",      F(IBM_multimode_draw_arrays) },
 154    { ON,  "GL_IBM_rasterpos_clip",             F(IBM_rasterpos_clip) },
 155    { OFF, "GL_IBM_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
 156    { OFF, "GL_INGR_blend_func_separate",       F(EXT_blend_func_separate) },
 157    { OFF, "GL_MESA_pack_invert",               F(MESA_pack_invert) },
 158    { OFF, "GL_MESA_packed_depth_stencil",      F(MESA_packed_depth_stencil) },
 159    { OFF, "GL_MESA_resize_buffers",            F(MESA_resize_buffers) },
 160    { OFF, "GL_MESA_texture_array",             F(MESA_texture_array) },
 161    { OFF, "GL_MESA_texture_signed_rgba",       F(MESA_texture_signed_rgba) },
 162    { OFF, "GL_MESA_ycbcr_texture",             F(MESA_ycbcr_texture) },
 163    { ON,  "GL_MESA_window_pos",                F(ARB_window_pos) },
 164    { OFF, "GL_NV_blend_square",                F(NV_blend_square) },
 165    { OFF, "GL_NV_fragment_program",            F(NV_fragment_program) },
 166    { ON,  "GL_NV_light_max_exponent",          F(NV_light_max_exponent) },
 167    { OFF, "GL_NV_point_sprite",                F(NV_point_sprite) },
 168    { OFF, "GL_NV_texture_env_combine4",        F(NV_texture_env_combine4) },
 169    { OFF, "GL_NV_texture_rectangle",           F(NV_texture_rectangle) },
 170    { ON,  "GL_NV_texgen_reflection",           F(NV_texgen_reflection) },
 171    { OFF, "GL_NV_vertex_program",              F(NV_vertex_program) },
 172    { OFF, "GL_NV_vertex_program1_1",           F(NV_vertex_program1_1) },
 173    { ON,  "GL_OES_read_format",                F(OES_read_format) },
 174    { OFF, "GL_SGI_color_matrix",               F(SGI_color_matrix) },
 175    { OFF, "GL_SGI_color_table",                F(SGI_color_table) },
 176    { OFF, "GL_SGI_texture_color_table",        F(SGI_texture_color_table) },
 177    { OFF, "GL_SGIS_generate_mipmap",           F(SGIS_generate_mipmap) },
 178    { OFF, "GL_SGIS_texture_border_clamp",      F(ARB_texture_border_clamp) },
 179    { ON,  "GL_SGIS_texture_edge_clamp",        F(SGIS_texture_edge_clamp) },
 180    { ON,  "GL_SGIS_texture_lod",               F(SGIS_texture_lod) },
 181    { ON,  "GL_SUN_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
 182    { OFF, "GL_S3_s3tc",                        F(S3_s3tc) },
 183 };
 184
 185
 186
 187 /**
 188  * Enable all extensions suitable for a software-only renderer.
 189  * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
 190  */
 191 void
 192 _mesa_enable_sw_extensions(GLcontext *ctx)
 193 {
 194    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 195    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 196    /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
 197 #if FEATURE_ARB_fragment_program
 198    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 199    ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 200 #endif
 201 #if FEATURE_ARB_fragment_shader
 202    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 203 #endif
 204 #if FEATURE_ARB_framebuffer_object
 205    ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 206 #endif
 207    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 208    ctx->Extensions.ARB_imaging = GL_TRUE;
 209    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 210    ctx->Extensions.ARB_multitexture = GL_TRUE;
 211 #if FEATURE_ARB_occlusion_query
 212    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 213 #endif
 214    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 215 #if FEATURE_ARB_shader_objects
 216    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 217 #endif
 218 #if FEATURE_ARB_shading_language_100
 219    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 220 #endif
 221 #if FEATURE_ARB_shading_language_120
 222    ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
 223 #endif
 224    ctx->Extensions.ARB_shadow = GL_TRUE;
 225    ctx->Extensions.ARB_shadow_ambient = GL_TRUE;
 226    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 227    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 228    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 229    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 230    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 231    /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
 232    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 233    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 234    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 235 #if FEATURE_ARB_vertex_program
 236    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 237 #endif
 238 #if FEATURE_ARB_vertex_shader
 239    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 240 #endif
 241 #if FEATURE_ARB_vertex_buffer_object
 242    /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
 243 #endif
 244 #if FEATURE_ARB_sync
 245    ctx->Extensions.ARB_sync = GL_TRUE;
 246 #endif
 247    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 248    ctx->Extensions.ATI_envmap_bumpmap = GL_TRUE;
 249 #if FEATURE_ATI_fragment_shader
 250    ctx->Extensions.ATI_fragment_shader = GL_TRUE;
 251 #endif
 252    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 253    ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 254    ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 255    ctx->Extensions.EXT_blend_color = GL_TRUE;
 256    ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 257    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 258    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 259    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 260    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 261    ctx->Extensions.EXT_convolution = GL_TRUE;
 262    ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
 263    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 264 #if FEATURE_EXT_framebuffer_object
 265    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 266 #endif
 267 #if FEATURE_EXT_framebuffer_blit
 268    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 269 #endif
 270    ctx->Extensions.EXT_histogram = GL_TRUE;
 271    /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
 272    ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 273    ctx->Extensions.EXT_paletted_texture = GL_TRUE;
 274 #if FEATURE_EXT_pixel_buffer_object
 275    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 276 #endif
 277    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 278    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 279    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 280    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 281    ctx->Extensions.EXT_shared_texture_palette = GL_TRUE;
 282    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 283    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 284    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 285    ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
 286    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 287    ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 288    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 289 #if FEATURE_EXT_texture_sRGB
 290    ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 291 #endif
 292    ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 293    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 294    /*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/
 295    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 296    ctx->Extensions.MESA_resize_buffers = GL_TRUE;
 297    ctx->Extensions.MESA_texture_array = GL_TRUE;
 298    ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 299    ctx->Extensions.NV_blend_square = GL_TRUE;
 300    /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
 301    ctx->Extensions.NV_point_sprite = GL_TRUE;
 302    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 303    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 304    /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
 305 #if FEATURE_NV_vertex_program
 306    ctx->Extensions.NV_vertex_program = GL_TRUE;
 307    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 308 #endif
 309 #if FEATURE_NV_fragment_program
 310    ctx->Extensions.NV_fragment_program = GL_TRUE;
 311 #endif
 312    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 313    ctx->Extensions.SGI_color_table = GL_TRUE;
 314    ctx->Extensions.SGI_texture_color_table = GL_TRUE;
 315    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 316    ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE;
 317 #if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program
 318    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 319 #endif
 320 #if FEATURE_texture_fxt1
 321    _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1");
 322 #endif
 323 #if FEATURE_texture_s3tc
 324    if (ctx->Mesa_DXTn) {
 325       _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
 326       _mesa_enable_extension(ctx, "GL_S3_s3tc");
 327    }
 328 #endif
 329 }
 330
 331
 332 /**
 333  * Enable GL_ARB_imaging and all the EXT extensions that are subsets of it.
 334  */
 335 void
 336 _mesa_enable_imaging_extensions(GLcontext *ctx)
 337 {
 338    ctx->Extensions.ARB_imaging = GL_TRUE;
 339    ctx->Extensions.EXT_blend_color = GL_TRUE;
 340    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 341    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 342    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 343    ctx->Extensions.EXT_convolution = GL_TRUE;
 344    ctx->Extensions.EXT_histogram = GL_TRUE;
 345    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 346    ctx->Extensions.SGI_color_table = GL_TRUE;
 347 }
 348
 349
 350
 351 /**
 352  * Enable all OpenGL 1.3 features and extensions.
 353  * A convenience function to be called by drivers.
 354  */
 355 void
 356 _mesa_enable_1_3_extensions(GLcontext *ctx)
 357 {
 358    /*ctx->Extensions.ARB_multisample = GL_TRUE;*/
 359    ctx->Extensions.ARB_multitexture = GL_TRUE;
 360    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 361    /*ctx->Extensions.ARB_texture_compression = GL_TRUE;*/
 362    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 363    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 364    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 365    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 366    /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
 367 }
 368
 369
 370
 371 /**
 372  * Enable all OpenGL 1.4 features and extensions.
 373  * A convenience function to be called by drivers.
 374  */
 375 void
 376 _mesa_enable_1_4_extensions(GLcontext *ctx)
 377 {
 378    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 379    ctx->Extensions.ARB_shadow = GL_TRUE;
 380    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 381    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 382    ctx->Extensions.ARB_window_pos = GL_TRUE;
 383    ctx->Extensions.EXT_blend_color = GL_TRUE;
 384    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 385    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 386    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 387    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 388    /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
 389    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 390    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 391    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 392    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 393    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 394 }
 395
 396
 397 /**
 398  * Enable all OpenGL 1.5 features and extensions.
 399  * A convenience function to be called by drivers.
 400  */
 401 void
 402 _mesa_enable_1_5_extensions(GLcontext *ctx)
 403 {
 404    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 405    /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
 406    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 407 }
 408
 409
 410 /**
 411  * Enable all OpenGL 2.0 features and extensions.
 412  * A convenience function to be called by drivers.
 413  */
 414 void
 415 _mesa_enable_2_0_extensions(GLcontext *ctx)
 416 {
 417    /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
 418 #if FEATURE_ARB_fragment_shader
 419    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 420 #endif
 421    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 422    ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 423    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 424 #if FEATURE_ARB_shader_objects
 425    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 426 #endif
 427 #if FEATURE_ARB_shading_language_100
 428    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 429 #endif
 430    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 431 #if FEATURE_ARB_vertex_shader
 432    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 433 #endif
 434 }
 435
 436
 437 /**
 438  * Enable all OpenGL 2.1 features and extensions.
 439  * A convenience function to be called by drivers.
 440  */
 441 void
 442 _mesa_enable_2_1_extensions(GLcontext *ctx)
 443 {
 444 #if FEATURE_EXT_pixel_buffer_object
 445    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 446 #endif
 447 #if FEATURE_EXT_texture_sRGB
 448    ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 449 #endif
 450 #ifdef FEATURE_ARB_shading_language_120
 451    ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
 452 #endif
 453 }
 454
 455
 456
 457 /**
 458  * Either enable or disable the named extension.
 459  * \return GL_TRUE for success, GL_FALSE if invalid extension name
 460  */
 461 static GLboolean
 462 set_extension( GLcontext *ctx, const char *name, GLboolean state )
 463 {
 464    GLboolean *base = (GLboolean *) &ctx->Extensions;
 465    GLuint i;
 466
 467    if (ctx->Extensions.String) {
 468       /* The string was already queried - can't change it now! */
 469       _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
 470       return GL_FALSE;
 471    }
 472
 473    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 474       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 475          if (default_extensions[i].flag_offset) {
 476             GLboolean *enabled = base + default_extensions[i].flag_offset;
 477             *enabled = state;
 478          }
 479          return GL_TRUE;
 480       }
 481    }
 482    return GL_FALSE;
 483 }
 484
 485
 486 /**
 487  * Enable the named extension.
 488  * Typically called by drivers.
 489  */
 490 void
 491 _mesa_enable_extension( GLcontext *ctx, const char *name )
 492 {
 493    if (!set_extension(ctx, name, GL_TRUE))
 494       _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
 495 }
 496
 497
 498 /**
 499  * Disable the named extension.
 500  * XXX is this really needed???
 501  */
 502 void
 503 _mesa_disable_extension( GLcontext *ctx, const char *name )
 504 {
 505    if (!set_extension(ctx, name, GL_FALSE))
 506       _mesa_problem(ctx, "Trying to disable unknown extension: %s", name);
 507 }
 508
 509
 510 /**
 511  * Test if the named extension is enabled in this context.
 512  */
 513 GLboolean
 514 _mesa_extension_is_enabled( GLcontext *ctx, const char *name )
 515 {
 516    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 517    GLuint i;
 518
 519    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 520       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 521          if (!default_extensions[i].flag_offset)
 522             return GL_TRUE;
 523          return *(base + default_extensions[i].flag_offset);
 524       }
 525    }
 526    return GL_FALSE;
 527 }
 528
 529
 530 /**
 531  * Append string 'b' onto string 'a'.  Free 'a' and return new string.
 532  */
 533 static char *
 534 append(const char *a, const char *b)
 535 {
 536    const GLuint aLen = a ? _mesa_strlen(a) : 0;
 537    const GLuint bLen = b ? _mesa_strlen(b) : 0;
 538    char *s = _mesa_calloc(aLen + bLen + 1);
 539    if (s) {
 540       if (a)
 541          _mesa_memcpy(s, a, aLen);
 542       if (b)
 543          _mesa_memcpy(s + aLen, b, bLen);
 544       s[aLen + bLen] = '\0';
 545    }
 546    if (a)
 547       _mesa_free((void *) a);
 548    return s;
 549 }
 550
 551
 552 /**
 553  * Check the MESA_EXTENSION_OVERRIDE env var.
 554  * For extension names that are recognized, turn them on.  For extension
 555  * names that are recognized and prefixed with '-', turn them off.
 556  * Return a string of the unknown/leftover names.
 557  */
 558 static const char *
 559 get_extension_override( GLcontext *ctx )
 560 {
 561    const char *envExt = _mesa_getenv("MESA_EXTENSION_OVERRIDE");
 562    char *extraExt = NULL;
 563    char ext[1000];
 564    GLuint extLen = 0;
 565    GLuint i;
 566    GLboolean disableExt = GL_FALSE;
 567
 568    if (!envExt)
 569       return NULL;
 570
 571    for (i = 0; ; i++) {
 572       if (envExt[i] == '\0' || envExt[i] == ' ') {
 573          /* terminate/process 'ext' if extLen > 0 */
 574          if (extLen > 0) {
 575             assert(extLen < sizeof(ext));
 576             /* enable extension named by 'ext' */
 577             ext[extLen] = 0;
 578             if (!set_extension(ctx, ext, !disableExt)) {
 579                /* unknown extension name, append it to extraExt */
 580                if (extraExt) {
 581                   extraExt = append(extraExt, " ");
 582                }
 583                extraExt = append(extraExt, ext);
 584             }
 585             extLen = 0;
 586             disableExt = GL_FALSE;
 587          }
 588          if (envExt[i] == '\0')
 589             break;
 590       }
 591       else if (envExt[i] == '-') {
 592          disableExt = GL_TRUE;
 593       }
 594       else {
 595          /* accumulate this non-space character */
 596          ext[extLen++] = envExt[i];
 597       }
 598    }
 599
 600    return extraExt;
 601 }
 602
 603
 604 /**
 605  * Run through the default_extensions array above and set the
 606  * ctx->Extensions.ARB/EXT_* flags accordingly.
 607  * To be called during context initialization.
 608  */
 609 void
 610 _mesa_init_extensions( GLcontext *ctx )
 611 {
 612    GLboolean *base = (GLboolean *) &ctx->Extensions;
 613    GLuint i;
 614
 615    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 616       if (default_extensions[i].enabled &&
 617           default_extensions[i].flag_offset) {
 618          *(base + default_extensions[i].flag_offset) = GL_TRUE;
 619       }
 620    }
 621 }
 622
 623
 624 /**
 625  * Construct the GL_EXTENSIONS string.  Called the first time that
 626  * glGetString(GL_EXTENSIONS) is called.
 627  */
 628 GLubyte *
 629 _mesa_make_extension_string( GLcontext *ctx )
 630 {
 631    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 632    const char *extraExt = get_extension_override(ctx);
 633    GLuint extStrLen = 0;
 634    char *s;
 635    GLuint i;
 636
 637    /* first, compute length of the extension string */
 638    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 639       if (!default_extensions[i].flag_offset ||
 640           *(base + default_extensions[i].flag_offset)) {
 641          extStrLen += (GLuint)_mesa_strlen(default_extensions[i].name) + 1;
 642       }
 643    }
 644
 645    if (extraExt)
 646       extStrLen += _mesa_strlen(extraExt) + 1; /* +1 for space */
 647
 648    /* allocate the extension string */
 649    s = (char *) _mesa_malloc(extStrLen);
 650    if (!s)
 651       return NULL;
 652
 653    /* second, build the extension string */
 654    extStrLen = 0;
 655    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 656       if (!default_extensions[i].flag_offset ||
 657           *(base + default_extensions[i].flag_offset)) {
 658          GLuint len = (GLuint)_mesa_strlen(default_extensions[i].name);
 659          _mesa_memcpy(s + extStrLen, default_extensions[i].name, len);
 660          extStrLen += len;
 661          s[extStrLen] = ' ';
 662          extStrLen++;
 663       }
 664    }
 665    ASSERT(extStrLen > 0);
 666
 667    s[extStrLen - 1] = 0; /* -1 to overwrite trailing the ' ' */
 668
 669    if (extraExt) {
 670       s = append(s, " ");
 671       s = append(s, extraExt);
 672    }
 673
 674    return (GLubyte *) s;
 675 }