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    { OFF, "GL_ARB_depth_clamp",                F(ARB_depth_clamp) },
  51    { ON,  "GL_ARB_draw_buffers",               F(ARB_draw_buffers) },
  52    { OFF, "GL_ARB_draw_elements_base_vertex",  F(ARB_draw_elements_base_vertex) },
  53    { OFF, "GL_ARB_fragment_coord_conventions", F(ARB_fragment_coord_conventions) },
  54    { OFF, "GL_ARB_fragment_program",           F(ARB_fragment_program) },
  55    { OFF, "GL_ARB_fragment_program_shadow",    F(ARB_fragment_program_shadow) },
  56    { OFF, "GL_ARB_fragment_shader",            F(ARB_fragment_shader) },
  57    { OFF, "GL_ARB_framebuffer_object",         F(ARB_framebuffer_object) },
  58    { OFF, "GL_ARB_half_float_pixel",           F(ARB_half_float_pixel) },
  59    { OFF, "GL_ARB_half_float_vertex",          F(ARB_half_float_vertex) },
  60    { OFF, "GL_ARB_imaging",                    F(ARB_imaging) },
  61    { OFF, "GL_ARB_map_buffer_range",           F(ARB_map_buffer_range) },
  62    { ON,  "GL_ARB_multisample",                F(ARB_multisample) },
  63    { OFF, "GL_ARB_multitexture",               F(ARB_multitexture) },
  64    { OFF, "GL_ARB_occlusion_query",            F(ARB_occlusion_query) },
  65    { OFF, "GL_ARB_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
  66    { OFF, "GL_ARB_point_parameters",           F(EXT_point_parameters) },
  67    { OFF, "GL_ARB_point_sprite",               F(ARB_point_sprite) },
  68    { OFF, "GL_ARB_provoking_vertex",           F(EXT_provoking_vertex) },
  69    { OFF, "GL_ARB_seamless_cube_map",          F(ARB_seamless_cube_map) },
  70    { OFF, "GL_ARB_shader_objects",             F(ARB_shader_objects) },
  71    { OFF, "GL_ARB_shading_language_100",       F(ARB_shading_language_100) },
  72    { OFF, "GL_ARB_shading_language_120",       F(ARB_shading_language_120) },
  73    { OFF, "GL_ARB_shadow",                     F(ARB_shadow) },
  74    { OFF, "GL_ARB_shadow_ambient",             F(ARB_shadow_ambient) },
  75    { OFF, "GL_ARB_sync",                       F(ARB_sync) },
  76    { OFF, "GL_ARB_texture_border_clamp",       F(ARB_texture_border_clamp) },
  77    { ON,  "GL_ARB_texture_compression",        F(ARB_texture_compression) },
  78    { OFF, "GL_ARB_texture_cube_map",           F(ARB_texture_cube_map) },
  79    { OFF, "GL_ARB_texture_env_add",            F(EXT_texture_env_add) },
  80    { OFF, "GL_ARB_texture_env_combine",        F(ARB_texture_env_combine) },
  81    { OFF, "GL_ARB_texture_env_crossbar",       F(ARB_texture_env_crossbar) },
  82    { OFF, "GL_ARB_texture_env_dot3",           F(ARB_texture_env_dot3) },
  83    { OFF, "GL_MESAX_texture_float",            F(ARB_texture_float) },
  84    { OFF, "GL_ARB_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
  85    { OFF, "GL_ARB_texture_non_power_of_two",   F(ARB_texture_non_power_of_two)},
  86    { OFF, "GL_ARB_texture_rectangle",          F(NV_texture_rectangle) },
  87    { ON,  "GL_ARB_transpose_matrix",           F(ARB_transpose_matrix) },
  88    { OFF, "GL_ARB_vertex_array_bgra",          F(EXT_vertex_array_bgra) },
  89    { OFF, "GL_ARB_vertex_array_object",        F(ARB_vertex_array_object) },
  90    { ON,  "GL_ARB_vertex_buffer_object",       F(ARB_vertex_buffer_object) },
  91    { OFF, "GL_ARB_vertex_program",             F(ARB_vertex_program) },
  92    { OFF, "GL_ARB_vertex_shader",              F(ARB_vertex_shader) },
  93    { ON,  "GL_ARB_window_pos",                 F(ARB_window_pos) },
  94    { ON,  "GL_EXT_abgr",                       F(EXT_abgr) },
  95    { ON,  "GL_EXT_bgra",                       F(EXT_bgra) },
  96    { OFF, "GL_EXT_blend_color",                F(EXT_blend_color) },
  97    { OFF, "GL_EXT_blend_equation_separate",    F(EXT_blend_equation_separate) },
  98    { OFF, "GL_EXT_blend_func_separate",        F(EXT_blend_func_separate) },
  99    { OFF, "GL_EXT_blend_logic_op",             F(EXT_blend_logic_op) },
 100    { OFF, "GL_EXT_blend_minmax",               F(EXT_blend_minmax) },
 101    { OFF, "GL_EXT_blend_subtract",             F(EXT_blend_subtract) },
 102    { OFF, "GL_EXT_clip_volume_hint",           F(EXT_clip_volume_hint) },
 103    { OFF, "GL_EXT_cull_vertex",                F(EXT_cull_vertex) },
 104    { ON,  "GL_EXT_compiled_vertex_array",      F(EXT_compiled_vertex_array) },
 105    { OFF, "GL_EXT_convolution",                F(EXT_convolution) },
 106    { ON,  "GL_EXT_copy_texture",               F(EXT_copy_texture) },
 107    { OFF, "GL_EXT_depth_bounds_test",          F(EXT_depth_bounds_test) },
 108    { OFF, "GL_EXT_draw_buffers2",              F(EXT_draw_buffers2) },
 109    { ON,  "GL_EXT_draw_range_elements",        F(EXT_draw_range_elements) },
 110    { OFF, "GL_EXT_framebuffer_blit",           F(EXT_framebuffer_blit) },
 111    { OFF, "GL_EXT_framebuffer_multisample",    F(EXT_framebuffer_multisample) },
 112    { OFF, "GL_EXT_framebuffer_object",         F(EXT_framebuffer_object) },
 113    { OFF, "GL_EXT_fog_coord",                  F(EXT_fog_coord) },
 114    { OFF, "GL_EXT_gpu_program_parameters",     F(EXT_gpu_program_parameters) },
 115    { OFF, "GL_EXT_histogram",                  F(EXT_histogram) },
 116    { ON,  "GL_EXT_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
 117    { OFF, "GL_EXT_packed_depth_stencil",       F(EXT_packed_depth_stencil) },
 118    { ON,  "GL_EXT_packed_pixels",              F(EXT_packed_pixels) },
 119    { OFF, "GL_EXT_paletted_texture",           F(EXT_paletted_texture) },
 120    { OFF, "GL_EXT_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
 121    { OFF, "GL_EXT_point_parameters",           F(EXT_point_parameters) },
 122    { ON,  "GL_EXT_polygon_offset",             F(EXT_polygon_offset) },
 123    { OFF, "GL_EXT_provoking_vertex",           F(EXT_provoking_vertex) },
 124    { ON,  "GL_EXT_rescale_normal",             F(EXT_rescale_normal) },
 125    { OFF, "GL_EXT_secondary_color",            F(EXT_secondary_color) },
 126    { ON,  "GL_EXT_separate_specular_color",    F(EXT_separate_specular_color) },
 127    { OFF, "GL_EXT_shadow_funcs",               F(EXT_shadow_funcs) },
 128    { OFF, "GL_EXT_shared_texture_palette",     F(EXT_shared_texture_palette) },
 129    { OFF, "GL_EXT_stencil_two_side",           F(EXT_stencil_two_side) },
 130    { OFF, "GL_EXT_stencil_wrap",               F(EXT_stencil_wrap) },
 131    { ON,  "GL_EXT_subtexture",                 F(EXT_subtexture) },
 132    { ON,  "GL_EXT_texture",                    F(EXT_texture) },
 133    { ON,  "GL_EXT_texture3D",                  F(EXT_texture3D) },
 134    { OFF, "GL_EXT_texture_array",              F(EXT_texture_array) },
 135    { OFF, "GL_EXT_texture_compression_s3tc",   F(EXT_texture_compression_s3tc) },
 136    { OFF, "GL_EXT_texture_cube_map",           F(ARB_texture_cube_map) },
 137    { ON,  "GL_EXT_texture_edge_clamp",         F(SGIS_texture_edge_clamp) },
 138    { OFF, "GL_EXT_texture_env_add",            F(EXT_texture_env_add) },
 139    { OFF, "GL_EXT_texture_env_combine",        F(EXT_texture_env_combine) },
 140    { OFF, "GL_EXT_texture_env_dot3",           F(EXT_texture_env_dot3) },
 141    { OFF, "GL_EXT_texture_filter_anisotropic", F(EXT_texture_filter_anisotropic) },
 142    { OFF, "GL_EXT_texture_lod_bias",           F(EXT_texture_lod_bias) },
 143    { OFF, "GL_EXT_texture_mirror_clamp",       F(EXT_texture_mirror_clamp) },
 144    { ON,  "GL_EXT_texture_object",             F(EXT_texture_object) },
 145    { OFF, "GL_EXT_texture_rectangle",          F(NV_texture_rectangle) },
 146    { OFF, "GL_EXT_texture_sRGB",               F(EXT_texture_sRGB) },
 147    { OFF, "GL_EXT_texture_swizzle",            F(EXT_texture_swizzle) },
 148    { OFF, "GL_EXT_timer_query",                F(EXT_timer_query) },
 149    { ON,  "GL_EXT_vertex_array",               F(EXT_vertex_array) },
 150    { OFF, "GL_EXT_vertex_array_bgra",          F(EXT_vertex_array_bgra) },
 151    { OFF, "GL_EXT_vertex_array_set",           F(EXT_vertex_array_set) },
 152    { OFF, "GL_3DFX_texture_compression_FXT1",  F(TDFX_texture_compression_FXT1) },
 153    { OFF, "GL_APPLE_client_storage",           F(APPLE_client_storage) },
 154    { ON,  "GL_APPLE_packed_pixels",            F(APPLE_packed_pixels) },
 155    { OFF, "GL_APPLE_vertex_array_object",      F(APPLE_vertex_array_object) },
 156    { OFF, "GL_APPLE_object_purgeable",         F(APPLE_object_purgeable) },
 157    { OFF, "GL_ATI_blend_equation_separate",    F(EXT_blend_equation_separate) },
 158    { OFF, "GL_ATI_envmap_bumpmap",             F(ATI_envmap_bumpmap) },
 159    { OFF, "GL_ATI_texture_env_combine3",       F(ATI_texture_env_combine3)},
 160    { OFF, "GL_ATI_texture_mirror_once",        F(ATI_texture_mirror_once)},
 161    { OFF, "GL_ATI_fragment_shader",            F(ATI_fragment_shader)},
 162    { OFF, "GL_ATI_separate_stencil",           F(ATI_separate_stencil)},
 163    { ON,  "GL_IBM_multimode_draw_arrays",      F(IBM_multimode_draw_arrays) },
 164    { ON,  "GL_IBM_rasterpos_clip",             F(IBM_rasterpos_clip) },
 165    { OFF, "GL_IBM_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
 166    { OFF, "GL_INGR_blend_func_separate",       F(EXT_blend_func_separate) },
 167    { OFF, "GL_MESA_pack_invert",               F(MESA_pack_invert) },
 168    { OFF, "GL_MESA_packed_depth_stencil",      F(MESA_packed_depth_stencil) },
 169    { OFF, "GL_MESA_resize_buffers",            F(MESA_resize_buffers) },
 170    { OFF, "GL_MESA_texture_array",             F(MESA_texture_array) },
 171    { OFF, "GL_MESA_texture_signed_rgba",       F(MESA_texture_signed_rgba) },
 172    { OFF, "GL_MESA_ycbcr_texture",             F(MESA_ycbcr_texture) },
 173    { ON,  "GL_MESA_window_pos",                F(ARB_window_pos) },
 174    { OFF, "GL_NV_blend_square",                F(NV_blend_square) },
 175    { OFF, "GL_NV_conditional_render",          F(NV_conditional_render) },
 176    { OFF, "GL_NV_depth_clamp",                 F(ARB_depth_clamp) },
 177    { OFF, "GL_NV_fragment_program",            F(NV_fragment_program) },
 178    { OFF, "GL_NV_fragment_program_option",     F(NV_fragment_program_option) },
 179    { ON,  "GL_NV_light_max_exponent",          F(NV_light_max_exponent) },
 180    { OFF, "GL_NV_packed_depth_stencil",        F(EXT_packed_depth_stencil) },
 181    { OFF, "GL_NV_point_sprite",                F(NV_point_sprite) },
 182    { OFF, "GL_NV_texture_env_combine4",        F(NV_texture_env_combine4) },
 183    { OFF, "GL_NV_texture_rectangle",           F(NV_texture_rectangle) },
 184    { ON,  "GL_NV_texgen_reflection",           F(NV_texgen_reflection) },
 185    { OFF, "GL_NV_vertex_program",              F(NV_vertex_program) },
 186    { OFF, "GL_NV_vertex_program1_1",           F(NV_vertex_program1_1) },
 187    { ON,  "GL_OES_read_format",                F(OES_read_format) },
 188    { OFF, "GL_SGI_color_matrix",               F(SGI_color_matrix) },
 189    { OFF, "GL_SGI_color_table",                F(SGI_color_table) },
 190    { OFF, "GL_SGI_texture_color_table",        F(SGI_texture_color_table) },
 191    { OFF, "GL_SGIS_generate_mipmap",           F(SGIS_generate_mipmap) },
 192    { OFF, "GL_SGIS_texture_border_clamp",      F(ARB_texture_border_clamp) },
 193    { ON,  "GL_SGIS_texture_edge_clamp",        F(SGIS_texture_edge_clamp) },
 194    { ON,  "GL_SGIS_texture_lod",               F(SGIS_texture_lod) },
 195    { ON,  "GL_SUN_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
 196    { OFF, "GL_S3_s3tc",                        F(S3_s3tc) },
 197 #if FEATURE_OES_draw_texture
 198    { OFF, "GL_OES_draw_texture",               F(OES_draw_texture) },
 199 #endif /* FEATURE_OES_draw_texture */
 200 };
 201
 202
 203
 204 /**
 205  * Enable all extensions suitable for a software-only renderer.
 206  * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
 207  */
 208 void
 209 _mesa_enable_sw_extensions(GLcontext *ctx)
 210 {
 211    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 212    ctx->Extensions.ARB_depth_clamp = GL_TRUE;
 213    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 214    /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
 215    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 216    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
 217 #if FEATURE_ARB_fragment_program
 218    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 219    ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 220 #endif
 221 #if FEATURE_ARB_fragment_shader
 222    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 223 #endif
 224 #if FEATURE_ARB_framebuffer_object
 225    ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 226 #endif
 227    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 228    ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
 229    ctx->Extensions.ARB_imaging = GL_TRUE;
 230    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 231    ctx->Extensions.ARB_multitexture = GL_TRUE;
 232 #if FEATURE_queryobj
 233    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 234 #endif
 235    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 236 #if FEATURE_ARB_shader_objects
 237    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 238 #endif
 239 #if FEATURE_ARB_shading_language_100
 240    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 241 #endif
 242 #if FEATURE_ARB_shading_language_120
 243    ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
 244 #endif
 245    ctx->Extensions.ARB_shadow = GL_TRUE;
 246    ctx->Extensions.ARB_shadow_ambient = GL_TRUE;
 247    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 248    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 249    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 250    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 251    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 252    /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
 253    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 254    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 255    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 256 #if FEATURE_ARB_vertex_program
 257    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 258 #endif
 259 #if FEATURE_ARB_vertex_shader
 260    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 261 #endif
 262 #if FEATURE_ARB_vertex_buffer_object
 263    /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
 264 #endif
 265 #if FEATURE_ARB_sync
 266    ctx->Extensions.ARB_sync = GL_TRUE;
 267 #endif
 268    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 269 #if FEATURE_APPLE_object_purgeable
 270    ctx->Extensions.APPLE_object_purgeable = GL_TRUE;
 271 #endif
 272    ctx->Extensions.ATI_envmap_bumpmap = GL_TRUE;
 273 #if FEATURE_ATI_fragment_shader
 274    ctx->Extensions.ATI_fragment_shader = GL_TRUE;
 275 #endif
 276    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 277    ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 278    ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 279    ctx->Extensions.EXT_blend_color = GL_TRUE;
 280    ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 281    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 282    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 283    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 284    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 285    ctx->Extensions.EXT_convolution = GL_TRUE;
 286    ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
 287    ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
 288    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 289 #if FEATURE_EXT_framebuffer_object
 290    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 291 #endif
 292 #if FEATURE_EXT_framebuffer_blit
 293    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 294 #endif
 295 #if FEATURE_ARB_framebuffer_object
 296    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 297 #endif
 298    ctx->Extensions.EXT_histogram = GL_TRUE;
 299    /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
 300    ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 301    ctx->Extensions.EXT_paletted_texture = GL_TRUE;
 302 #if FEATURE_EXT_pixel_buffer_object
 303    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 304 #endif
 305    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 306    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 307    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 308    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 309    ctx->Extensions.EXT_shared_texture_palette = GL_TRUE;
 310    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 311    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 312    ctx->Extensions.EXT_texture_array = GL_TRUE;
 313    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 314    ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
 315    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 316    ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 317    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 318 #if FEATURE_EXT_texture_sRGB
 319    ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 320 #endif
 321    ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 322    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 323    /*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/
 324    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 325    ctx->Extensions.MESA_resize_buffers = GL_TRUE;
 326    ctx->Extensions.MESA_texture_array = GL_TRUE;
 327    ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 328    ctx->Extensions.NV_blend_square = GL_TRUE;
 329    ctx->Extensions.NV_conditional_render = GL_TRUE;
 330    /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
 331    ctx->Extensions.NV_point_sprite = GL_TRUE;
 332    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 333    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 334    /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
 335 #if FEATURE_NV_vertex_program
 336    ctx->Extensions.NV_vertex_program = GL_TRUE;
 337    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 338 #endif
 339 #if FEATURE_NV_fragment_program
 340    ctx->Extensions.NV_fragment_program = GL_TRUE;
 341 #endif
 342 #if FEATURE_NV_fragment_program && FEATURE_ARB_fragment_program
 343    ctx->Extensions.NV_fragment_program_option = GL_TRUE;
 344 #endif
 345    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 346    ctx->Extensions.SGI_color_table = GL_TRUE;
 347    ctx->Extensions.SGI_texture_color_table = GL_TRUE;
 348    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 349    ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE;
 350 #if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program
 351    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 352 #endif
 353 #if FEATURE_texture_fxt1
 354    _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1");
 355 #endif
 356 #if FEATURE_texture_s3tc
 357    if (ctx->Mesa_DXTn) {
 358       _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
 359       _mesa_enable_extension(ctx, "GL_S3_s3tc");
 360    }
 361 #endif
 362 }
 363
 364
 365 /**
 366  * Enable GL_ARB_imaging and all the EXT extensions that are subsets of it.
 367  */
 368 void
 369 _mesa_enable_imaging_extensions(GLcontext *ctx)
 370 {
 371    ctx->Extensions.ARB_imaging = GL_TRUE;
 372    ctx->Extensions.EXT_blend_color = GL_TRUE;
 373    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 374    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 375    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 376    ctx->Extensions.EXT_convolution = GL_TRUE;
 377    ctx->Extensions.EXT_histogram = GL_TRUE;
 378    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 379    ctx->Extensions.SGI_color_table = GL_TRUE;
 380 }
 381
 382
 383
 384 /**
 385  * Enable all OpenGL 1.3 features and extensions.
 386  * A convenience function to be called by drivers.
 387  */
 388 void
 389 _mesa_enable_1_3_extensions(GLcontext *ctx)
 390 {
 391    /*ctx->Extensions.ARB_multisample = GL_TRUE;*/
 392    ctx->Extensions.ARB_multitexture = GL_TRUE;
 393    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 394    /*ctx->Extensions.ARB_texture_compression = GL_TRUE;*/
 395    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 396    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 397    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 398    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 399    /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
 400 }
 401
 402
 403
 404 /**
 405  * Enable all OpenGL 1.4 features and extensions.
 406  * A convenience function to be called by drivers.
 407  */
 408 void
 409 _mesa_enable_1_4_extensions(GLcontext *ctx)
 410 {
 411    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 412    ctx->Extensions.ARB_shadow = GL_TRUE;
 413    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 414    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 415    ctx->Extensions.ARB_window_pos = GL_TRUE;
 416    ctx->Extensions.EXT_blend_color = GL_TRUE;
 417    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 418    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 419    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 420    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 421    /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
 422    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 423    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 424    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 425    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 426    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 427 }
 428
 429
 430 /**
 431  * Enable all OpenGL 1.5 features and extensions.
 432  * A convenience function to be called by drivers.
 433  */
 434 void
 435 _mesa_enable_1_5_extensions(GLcontext *ctx)
 436 {
 437    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 438    /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
 439    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 440 }
 441
 442
 443 /**
 444  * Enable all OpenGL 2.0 features and extensions.
 445  * A convenience function to be called by drivers.
 446  */
 447 void
 448 _mesa_enable_2_0_extensions(GLcontext *ctx)
 449 {
 450    /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
 451 #if FEATURE_ARB_fragment_shader
 452    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 453 #endif
 454    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 455    ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 456    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 457 #if FEATURE_ARB_shader_objects
 458    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 459 #endif
 460 #if FEATURE_ARB_shading_language_100
 461    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 462 #endif
 463    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 464 #if FEATURE_ARB_vertex_shader
 465    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 466 #endif
 467 }
 468
 469
 470 /**
 471  * Enable all OpenGL 2.1 features and extensions.
 472  * A convenience function to be called by drivers.
 473  */
 474 void
 475 _mesa_enable_2_1_extensions(GLcontext *ctx)
 476 {
 477 #if FEATURE_EXT_pixel_buffer_object
 478    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 479 #endif
 480 #if FEATURE_EXT_texture_sRGB
 481    ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 482 #endif
 483 #if FEATURE_ARB_shading_language_120
 484    ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
 485 #endif
 486 }
 487
 488
 489
 490 /**
 491  * Either enable or disable the named extension.
 492  * \return GL_TRUE for success, GL_FALSE if invalid extension name
 493  */
 494 static GLboolean
 495 set_extension( GLcontext *ctx, const char *name, GLboolean state )
 496 {
 497    GLboolean *base = (GLboolean *) &ctx->Extensions;
 498    GLuint i;
 499
 500    if (ctx->Extensions.String) {
 501       /* The string was already queried - can't change it now! */
 502       _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
 503       return GL_FALSE;
 504    }
 505
 506    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 507       if (strcmp(default_extensions[i].name, name) == 0) {
 508          if (default_extensions[i].flag_offset) {
 509             GLboolean *enabled = base + default_extensions[i].flag_offset;
 510             *enabled = state;
 511          }
 512          return GL_TRUE;
 513       }
 514    }
 515    return GL_FALSE;
 516 }
 517
 518
 519 /**
 520  * Enable the named extension.
 521  * Typically called by drivers.
 522  */
 523 void
 524 _mesa_enable_extension( GLcontext *ctx, const char *name )
 525 {
 526    if (!set_extension(ctx, name, GL_TRUE))
 527       _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
 528 }
 529
 530
 531 /**
 532  * Disable the named extension.
 533  * XXX is this really needed???
 534  */
 535 void
 536 _mesa_disable_extension( GLcontext *ctx, const char *name )
 537 {
 538    if (!set_extension(ctx, name, GL_FALSE))
 539       _mesa_problem(ctx, "Trying to disable unknown extension: %s", name);
 540 }
 541
 542
 543 /**
 544  * Check if the i-th extension is enabled.
 545  */
 546 static GLboolean
 547 extension_enabled(GLcontext *ctx, GLuint index)
 548 {
 549    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 550    if (!default_extensions[index].flag_offset ||
 551        *(base + default_extensions[index].flag_offset)) {
 552       return GL_TRUE;
 553    }
 554    else {
 555       return GL_FALSE;
 556    }
 557 }
 558
 559
 560 /**
 561  * Test if the named extension is enabled in this context.
 562  */
 563 GLboolean
 564 _mesa_extension_is_enabled( GLcontext *ctx, const char *name )
 565 {
 566    GLuint i;
 567
 568    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 569       if (strcmp(default_extensions[i].name, name) == 0) {
 570          return extension_enabled(ctx, i);
 571       }
 572    }
 573    return GL_FALSE;
 574 }
 575
 576
 577 /**
 578  * Append string 'b' onto string 'a'.  Free 'a' and return new string.
 579  */
 580 static char *
 581 append(const char *a, const char *b)
 582 {
 583    const GLuint aLen = a ? strlen(a) : 0;
 584    const GLuint bLen = b ? strlen(b) : 0;
 585    char *s = calloc(1, aLen + bLen + 1);
 586    if (s) {
 587       if (a)
 588          memcpy(s, a, aLen);
 589       if (b)
 590          memcpy(s + aLen, b, bLen);
 591       s[aLen + bLen] = '\0';
 592    }
 593    if (a)
 594       free((void *) a);
 595    return s;
 596 }
 597
 598
 599 /**
 600  * Check the MESA_EXTENSION_OVERRIDE env var.
 601  * For extension names that are recognized, turn them on.  For extension
 602  * names that are recognized and prefixed with '-', turn them off.
 603  * Return a string of the unknown/leftover names.
 604  */
 605 static const char *
 606 get_extension_override( GLcontext *ctx )
 607 {
 608    const char *envExt = _mesa_getenv("MESA_EXTENSION_OVERRIDE");
 609    char *extraExt = NULL;
 610    char ext[1000];
 611    GLuint extLen = 0;
 612    GLuint i;
 613    GLboolean disableExt = GL_FALSE;
 614
 615    if (!envExt)
 616       return NULL;
 617
 618    for (i = 0; ; i++) {
 619       if (envExt[i] == '\0' || envExt[i] == ' ') {
 620          /* terminate/process 'ext' if extLen > 0 */
 621          if (extLen > 0) {
 622             assert(extLen < sizeof(ext));
 623             /* enable extension named by 'ext' */
 624             ext[extLen] = 0;
 625             if (!set_extension(ctx, ext, !disableExt)) {
 626                /* unknown extension name, append it to extraExt */
 627                if (extraExt) {
 628                   extraExt = append(extraExt, " ");
 629                }
 630                extraExt = append(extraExt, ext);
 631             }
 632             extLen = 0;
 633             disableExt = GL_FALSE;
 634          }
 635          if (envExt[i] == '\0')
 636             break;
 637       }
 638       else if (envExt[i] == '-') {
 639          disableExt = GL_TRUE;
 640       }
 641       else {
 642          /* accumulate this non-space character */
 643          ext[extLen++] = envExt[i];
 644       }
 645    }
 646
 647    return extraExt;
 648 }
 649
 650
 651 /**
 652  * Run through the default_extensions array above and set the
 653  * ctx->Extensions.ARB/EXT_* flags accordingly.
 654  * To be called during context initialization.
 655  */
 656 void
 657 _mesa_init_extensions( GLcontext *ctx )
 658 {
 659    GLboolean *base = (GLboolean *) &ctx->Extensions;
 660    GLuint i;
 661
 662    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 663       if (default_extensions[i].enabled &&
 664           default_extensions[i].flag_offset) {
 665          *(base + default_extensions[i].flag_offset) = GL_TRUE;
 666       }
 667    }
 668 }
 669
 670
 671 /**
 672  * Construct the GL_EXTENSIONS string.  Called the first time that
 673  * glGetString(GL_EXTENSIONS) is called.
 674  */
 675 GLubyte *
 676 _mesa_make_extension_string( GLcontext *ctx )
 677 {
 678    const char *extraExt = get_extension_override(ctx);
 679    GLuint extStrLen = 0;
 680    char *s;
 681    GLuint i;
 682
 683    /* first, compute length of the extension string */
 684    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 685       if (extension_enabled(ctx, i)) {
 686          extStrLen += (GLuint) strlen(default_extensions[i].name) + 1;
 687       }
 688    }
 689
 690    if (extraExt)
 691       extStrLen += strlen(extraExt) + 1; /* +1 for space */
 692
 693    /* allocate the extension string */
 694    s = (char *) malloc(extStrLen);
 695    if (!s)
 696       return NULL;
 697
 698    /* second, build the extension string */
 699    extStrLen = 0;
 700    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 701       if (extension_enabled(ctx, i)) {
 702          GLuint len = (GLuint) strlen(default_extensions[i].name);
 703          memcpy(s + extStrLen, default_extensions[i].name, len);
 704          extStrLen += len;
 705          s[extStrLen] = ' ';
 706          extStrLen++;
 707       }
 708    }
 709    ASSERT(extStrLen > 0);
 710
 711    s[extStrLen - 1] = 0; /* -1 to overwrite trailing the ' ' */
 712
 713    if (extraExt) {
 714       s = append(s, " ");
 715       s = append(s, extraExt);
 716    }
 717
 718    return (GLubyte *) s;
 719 }
 720
 721
 722 /**
 723  * Return number of enabled extensions.
 724  */
 725 GLuint
 726 _mesa_get_extension_count(GLcontext *ctx)
 727 {
 728    GLuint i;
 729
 730    /* only count once */
 731    if (!ctx->Extensions.Count) {
 732       for (i = 0; i < Elements(default_extensions); i++) {
 733          if (extension_enabled(ctx, i)) {
 734             ctx->Extensions.Count++;
 735          }
 736       }
 737    }
 738
 739    if (0)
 740       _mesa_debug(ctx, "%u of %d extensions enabled\n", ctx->Extensions.Count,
 741                   Elements(default_extensions));
 742
 743    return ctx->Extensions.Count;
 744 }
 745
 746
 747 /**
 748  * Return name of i-th enabled extension
 749  */
 750 const GLubyte *
 751 _mesa_get_enabled_extension(GLcontext *ctx, GLuint index)
 752 {
 753    GLuint i;
 754
 755    for (i = 0; i < Elements(default_extensions); i++) {
 756       if (extension_enabled(ctx, i)) {
 757          if (index == 0)
 758             return (const GLubyte *) default_extensions[i].name;
 759          index--;
 760       }
 761    }
 762
 763    return NULL;
 764 }