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