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_compression_s3tc",   F(EXT_texture_compression_s3tc) },
 135    { ON,  "GL_EXT_texture_edge_clamp",         F(SGIS_texture_edge_clamp) },
 136    { OFF, "GL_EXT_texture_env_add",            F(EXT_texture_env_add) },
 137    { OFF, "GL_EXT_texture_env_combine",        F(EXT_texture_env_combine) },
 138    { OFF, "GL_EXT_texture_env_dot3",           F(EXT_texture_env_dot3) },
 139    { OFF, "GL_EXT_texture_filter_anisotropic", F(EXT_texture_filter_anisotropic) },
 140    { OFF, "GL_EXT_texture_lod_bias",           F(EXT_texture_lod_bias) },
 141    { OFF, "GL_EXT_texture_mirror_clamp",       F(EXT_texture_mirror_clamp) },
 142    { ON,  "GL_EXT_texture_object",             F(EXT_texture_object) },
 143    { OFF, "GL_EXT_texture_rectangle",          F(NV_texture_rectangle) },
 144    { OFF, "GL_EXT_texture_sRGB",               F(EXT_texture_sRGB) },
 145    { OFF, "GL_EXT_texture_swizzle",            F(EXT_texture_swizzle) },
 146    { OFF, "GL_EXT_timer_query",                F(EXT_timer_query) },
 147    { ON,  "GL_EXT_vertex_array",               F(EXT_vertex_array) },
 148    { OFF, "GL_EXT_vertex_array_bgra",          F(EXT_vertex_array_bgra) },
 149    { OFF, "GL_EXT_vertex_array_set",           F(EXT_vertex_array_set) },
 150    { OFF, "GL_3DFX_texture_compression_FXT1",  F(TDFX_texture_compression_FXT1) },
 151    { OFF, "GL_APPLE_client_storage",           F(APPLE_client_storage) },
 152    { ON,  "GL_APPLE_packed_pixels",            F(APPLE_packed_pixels) },
 153    { OFF, "GL_APPLE_vertex_array_object",      F(APPLE_vertex_array_object) },
 154    { OFF, "GL_ATI_blend_equation_separate",    F(EXT_blend_equation_separate) },
 155    { OFF, "GL_ATI_envmap_bumpmap",             F(ATI_envmap_bumpmap) },
 156    { OFF, "GL_ATI_texture_env_combine3",       F(ATI_texture_env_combine3)},
 157    { OFF, "GL_ATI_texture_mirror_once",        F(ATI_texture_mirror_once)},
 158    { OFF, "GL_ATI_fragment_shader",            F(ATI_fragment_shader)},
 159    { OFF, "GL_ATI_separate_stencil",           F(ATI_separate_stencil)},
 160    { ON,  "GL_IBM_multimode_draw_arrays",      F(IBM_multimode_draw_arrays) },
 161    { ON,  "GL_IBM_rasterpos_clip",             F(IBM_rasterpos_clip) },
 162    { OFF, "GL_IBM_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
 163    { OFF, "GL_INGR_blend_func_separate",       F(EXT_blend_func_separate) },
 164    { OFF, "GL_MESA_pack_invert",               F(MESA_pack_invert) },
 165    { OFF, "GL_MESA_packed_depth_stencil",      F(MESA_packed_depth_stencil) },
 166    { OFF, "GL_MESA_resize_buffers",            F(MESA_resize_buffers) },
 167    { OFF, "GL_MESA_texture_array",             F(MESA_texture_array) },
 168    { OFF, "GL_MESA_texture_signed_rgba",       F(MESA_texture_signed_rgba) },
 169    { OFF, "GL_MESA_ycbcr_texture",             F(MESA_ycbcr_texture) },
 170    { ON,  "GL_MESA_window_pos",                F(ARB_window_pos) },
 171    { OFF, "GL_NV_blend_square",                F(NV_blend_square) },
 172    { OFF, "GL_NV_conditional_render",          F(NV_conditional_render) },
 173    { OFF, "GL_NV_depth_clamp",                 F(ARB_depth_clamp) },
 174    { OFF, "GL_NV_fragment_program",            F(NV_fragment_program) },
 175    { OFF, "GL_NV_fragment_program_option",     F(NV_fragment_program_option) },
 176    { ON,  "GL_NV_light_max_exponent",          F(NV_light_max_exponent) },
 177    { OFF, "GL_NV_packed_depth_stencil",        F(EXT_packed_depth_stencil) },
 178    { OFF, "GL_NV_point_sprite",                F(NV_point_sprite) },
 179    { OFF, "GL_NV_texture_env_combine4",        F(NV_texture_env_combine4) },
 180    { OFF, "GL_NV_texture_rectangle",           F(NV_texture_rectangle) },
 181    { ON,  "GL_NV_texgen_reflection",           F(NV_texgen_reflection) },
 182    { OFF, "GL_NV_vertex_program",              F(NV_vertex_program) },
 183    { OFF, "GL_NV_vertex_program1_1",           F(NV_vertex_program1_1) },
 184    { ON,  "GL_OES_read_format",                F(OES_read_format) },
 185    { OFF, "GL_SGI_color_matrix",               F(SGI_color_matrix) },
 186    { OFF, "GL_SGI_color_table",                F(SGI_color_table) },
 187    { OFF, "GL_SGI_texture_color_table",        F(SGI_texture_color_table) },
 188    { OFF, "GL_SGIS_generate_mipmap",           F(SGIS_generate_mipmap) },
 189    { OFF, "GL_SGIS_texture_border_clamp",      F(ARB_texture_border_clamp) },
 190    { ON,  "GL_SGIS_texture_edge_clamp",        F(SGIS_texture_edge_clamp) },
 191    { ON,  "GL_SGIS_texture_lod",               F(SGIS_texture_lod) },
 192    { ON,  "GL_SUN_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
 193    { OFF, "GL_S3_s3tc",                        F(S3_s3tc) },
 194 #if FEATURE_OES_draw_texture
 195    { OFF, "GL_OES_draw_texture",               F(OES_draw_texture) },
 196 #endif /* FEATURE_OES_draw_texture */
 197 };
 198
 199
 200
 201 /**
 202  * Enable all extensions suitable for a software-only renderer.
 203  * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
 204  */
 205 void
 206 _mesa_enable_sw_extensions(GLcontext *ctx)
 207 {
 208    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 209    ctx->Extensions.ARB_depth_clamp = GL_TRUE;
 210    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 211    /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
 212    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 213 #if FEATURE_ARB_fragment_program
 214    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 215    ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 216 #endif
 217 #if FEATURE_ARB_fragment_shader
 218    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 219 #endif
 220 #if FEATURE_ARB_framebuffer_object
 221    ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 222 #endif
 223    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 224    ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
 225    ctx->Extensions.ARB_imaging = GL_TRUE;
 226    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 227    ctx->Extensions.ARB_multitexture = GL_TRUE;
 228 #if FEATURE_queryobj
 229    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 230 #endif
 231    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 232 #if FEATURE_ARB_shader_objects
 233    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 234 #endif
 235 #if FEATURE_ARB_shading_language_100
 236    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 237 #endif
 238 #if FEATURE_ARB_shading_language_120
 239    ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
 240 #endif
 241    ctx->Extensions.ARB_shadow = GL_TRUE;
 242    ctx->Extensions.ARB_shadow_ambient = GL_TRUE;
 243    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 244    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 245    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 246    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 247    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 248    /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
 249    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 250    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 251    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 252 #if FEATURE_ARB_vertex_program
 253    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 254 #endif
 255 #if FEATURE_ARB_vertex_shader
 256    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 257 #endif
 258 #if FEATURE_ARB_vertex_buffer_object
 259    /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
 260 #endif
 261 #if FEATURE_ARB_sync
 262    ctx->Extensions.ARB_sync = GL_TRUE;
 263 #endif
 264    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 265    ctx->Extensions.ATI_envmap_bumpmap = GL_TRUE;
 266 #if FEATURE_ATI_fragment_shader
 267    ctx->Extensions.ATI_fragment_shader = GL_TRUE;
 268 #endif
 269    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 270    ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 271    ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 272    ctx->Extensions.EXT_blend_color = GL_TRUE;
 273    ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 274    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 275    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 276    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 277    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 278    ctx->Extensions.EXT_convolution = GL_TRUE;
 279    ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
 280    ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
 281    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 282 #if FEATURE_EXT_framebuffer_object
 283    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 284 #endif
 285 #if FEATURE_EXT_framebuffer_blit
 286    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 287 #endif
 288 #if FEATURE_ARB_framebuffer_object
 289    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 290 #endif
 291    ctx->Extensions.EXT_histogram = GL_TRUE;
 292    /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
 293    ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 294    ctx->Extensions.EXT_paletted_texture = GL_TRUE;
 295 #if FEATURE_EXT_pixel_buffer_object
 296    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 297 #endif
 298    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 299    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 300    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 301    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 302    ctx->Extensions.EXT_shared_texture_palette = GL_TRUE;
 303    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 304    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 305    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 306    ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
 307    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 308    ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 309    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 310 #if FEATURE_EXT_texture_sRGB
 311    ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 312 #endif
 313    ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 314    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 315    /*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/
 316    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 317    ctx->Extensions.MESA_resize_buffers = GL_TRUE;
 318    ctx->Extensions.MESA_texture_array = GL_TRUE;
 319    ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 320    ctx->Extensions.NV_blend_square = GL_TRUE;
 321    ctx->Extensions.NV_conditional_render = GL_TRUE;
 322    /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
 323    ctx->Extensions.NV_point_sprite = GL_TRUE;
 324    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 325    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 326    /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
 327 #if FEATURE_NV_vertex_program
 328    ctx->Extensions.NV_vertex_program = GL_TRUE;
 329    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 330 #endif
 331 #if FEATURE_NV_fragment_program
 332    ctx->Extensions.NV_fragment_program = GL_TRUE;
 333 #endif
 334 #if FEATURE_NV_fragment_program && FEATURE_ARB_fragment_program
 335    ctx->Extensions.NV_fragment_program_option = GL_TRUE;
 336 #endif
 337    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 338    ctx->Extensions.SGI_color_table = GL_TRUE;
 339    ctx->Extensions.SGI_texture_color_table = GL_TRUE;
 340    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 341    ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE;
 342 #if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program
 343    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 344 #endif
 345 #if FEATURE_texture_fxt1
 346    _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1");
 347 #endif
 348 #if FEATURE_texture_s3tc
 349    if (ctx->Mesa_DXTn) {
 350       _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
 351       _mesa_enable_extension(ctx, "GL_S3_s3tc");
 352    }
 353 #endif
 354 }
 355
 356
 357 /**
 358  * Enable GL_ARB_imaging and all the EXT extensions that are subsets of it.
 359  */
 360 void
 361 _mesa_enable_imaging_extensions(GLcontext *ctx)
 362 {
 363    ctx->Extensions.ARB_imaging = GL_TRUE;
 364    ctx->Extensions.EXT_blend_color = GL_TRUE;
 365    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 366    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 367    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 368    ctx->Extensions.EXT_convolution = GL_TRUE;
 369    ctx->Extensions.EXT_histogram = GL_TRUE;
 370    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 371    ctx->Extensions.SGI_color_table = GL_TRUE;
 372 }
 373
 374
 375
 376 /**
 377  * Enable all OpenGL 1.3 features and extensions.
 378  * A convenience function to be called by drivers.
 379  */
 380 void
 381 _mesa_enable_1_3_extensions(GLcontext *ctx)
 382 {
 383    /*ctx->Extensions.ARB_multisample = GL_TRUE;*/
 384    ctx->Extensions.ARB_multitexture = GL_TRUE;
 385    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 386    /*ctx->Extensions.ARB_texture_compression = GL_TRUE;*/
 387    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 388    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 389    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 390    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 391    /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
 392 }
 393
 394
 395
 396 /**
 397  * Enable all OpenGL 1.4 features and extensions.
 398  * A convenience function to be called by drivers.
 399  */
 400 void
 401 _mesa_enable_1_4_extensions(GLcontext *ctx)
 402 {
 403    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 404    ctx->Extensions.ARB_shadow = GL_TRUE;
 405    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 406    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 407    ctx->Extensions.ARB_window_pos = GL_TRUE;
 408    ctx->Extensions.EXT_blend_color = GL_TRUE;
 409    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 410    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 411    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 412    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 413    /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
 414    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 415    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 416    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 417    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 418    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 419 }
 420
 421
 422 /**
 423  * Enable all OpenGL 1.5 features and extensions.
 424  * A convenience function to be called by drivers.
 425  */
 426 void
 427 _mesa_enable_1_5_extensions(GLcontext *ctx)
 428 {
 429    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 430    /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
 431    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 432 }
 433
 434
 435 /**
 436  * Enable all OpenGL 2.0 features and extensions.
 437  * A convenience function to be called by drivers.
 438  */
 439 void
 440 _mesa_enable_2_0_extensions(GLcontext *ctx)
 441 {
 442    /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
 443 #if FEATURE_ARB_fragment_shader
 444    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 445 #endif
 446    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 447    ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 448    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 449 #if FEATURE_ARB_shader_objects
 450    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 451 #endif
 452 #if FEATURE_ARB_shading_language_100
 453    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 454 #endif
 455    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 456 #if FEATURE_ARB_vertex_shader
 457    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 458 #endif
 459 }
 460
 461
 462 /**
 463  * Enable all OpenGL 2.1 features and extensions.
 464  * A convenience function to be called by drivers.
 465  */
 466 void
 467 _mesa_enable_2_1_extensions(GLcontext *ctx)
 468 {
 469 #if FEATURE_EXT_pixel_buffer_object
 470    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 471 #endif
 472 #if FEATURE_EXT_texture_sRGB
 473    ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 474 #endif
 475 #ifdef FEATURE_ARB_shading_language_120
 476    ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
 477 #endif
 478 }
 479
 480
 481
 482 /**
 483  * Either enable or disable the named extension.
 484  * \return GL_TRUE for success, GL_FALSE if invalid extension name
 485  */
 486 static GLboolean
 487 set_extension( GLcontext *ctx, const char *name, GLboolean state )
 488 {
 489    GLboolean *base = (GLboolean *) &ctx->Extensions;
 490    GLuint i;
 491
 492    if (ctx->Extensions.String) {
 493       /* The string was already queried - can't change it now! */
 494       _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
 495       return GL_FALSE;
 496    }
 497
 498    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 499       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 500          if (default_extensions[i].flag_offset) {
 501             GLboolean *enabled = base + default_extensions[i].flag_offset;
 502             *enabled = state;
 503          }
 504          return GL_TRUE;
 505       }
 506    }
 507    return GL_FALSE;
 508 }
 509
 510
 511 /**
 512  * Enable the named extension.
 513  * Typically called by drivers.
 514  */
 515 void
 516 _mesa_enable_extension( GLcontext *ctx, const char *name )
 517 {
 518    if (!set_extension(ctx, name, GL_TRUE))
 519       _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
 520 }
 521
 522
 523 /**
 524  * Disable the named extension.
 525  * XXX is this really needed???
 526  */
 527 void
 528 _mesa_disable_extension( GLcontext *ctx, const char *name )
 529 {
 530    if (!set_extension(ctx, name, GL_FALSE))
 531       _mesa_problem(ctx, "Trying to disable unknown extension: %s", name);
 532 }
 533
 534
 535 /**
 536  * Check if the i-th extension is enabled.
 537  */
 538 static GLboolean
 539 extension_enabled(GLcontext *ctx, GLuint index)
 540 {
 541    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 542    if (!default_extensions[index].flag_offset ||
 543        *(base + default_extensions[index].flag_offset)) {
 544       return GL_TRUE;
 545    }
 546    else {
 547       return GL_FALSE;
 548    }
 549 }
 550
 551
 552 /**
 553  * Test if the named extension is enabled in this context.
 554  */
 555 GLboolean
 556 _mesa_extension_is_enabled( GLcontext *ctx, const char *name )
 557 {
 558    GLuint i;
 559
 560    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 561       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 562          return extension_enabled(ctx, i);
 563       }
 564    }
 565    return GL_FALSE;
 566 }
 567
 568
 569 /**
 570  * Append string 'b' onto string 'a'.  Free 'a' and return new string.
 571  */
 572 static char *
 573 append(const char *a, const char *b)
 574 {
 575    const GLuint aLen = a ? _mesa_strlen(a) : 0;
 576    const GLuint bLen = b ? _mesa_strlen(b) : 0;
 577    char *s = _mesa_calloc(aLen + bLen + 1);
 578    if (s) {
 579       if (a)
 580          _mesa_memcpy(s, a, aLen);
 581       if (b)
 582          _mesa_memcpy(s + aLen, b, bLen);
 583       s[aLen + bLen] = '\0';
 584    }
 585    if (a)
 586       _mesa_free((void *) a);
 587    return s;
 588 }
 589
 590
 591 /**
 592  * Check the MESA_EXTENSION_OVERRIDE env var.
 593  * For extension names that are recognized, turn them on.  For extension
 594  * names that are recognized and prefixed with '-', turn them off.
 595  * Return a string of the unknown/leftover names.
 596  */
 597 static const char *
 598 get_extension_override( GLcontext *ctx )
 599 {
 600    const char *envExt = _mesa_getenv("MESA_EXTENSION_OVERRIDE");
 601    char *extraExt = NULL;
 602    char ext[1000];
 603    GLuint extLen = 0;
 604    GLuint i;
 605    GLboolean disableExt = GL_FALSE;
 606
 607    if (!envExt)
 608       return NULL;
 609
 610    for (i = 0; ; i++) {
 611       if (envExt[i] == '\0' || envExt[i] == ' ') {
 612          /* terminate/process 'ext' if extLen > 0 */
 613          if (extLen > 0) {
 614             assert(extLen < sizeof(ext));
 615             /* enable extension named by 'ext' */
 616             ext[extLen] = 0;
 617             if (!set_extension(ctx, ext, !disableExt)) {
 618                /* unknown extension name, append it to extraExt */
 619                if (extraExt) {
 620                   extraExt = append(extraExt, " ");
 621                }
 622                extraExt = append(extraExt, ext);
 623             }
 624             extLen = 0;
 625             disableExt = GL_FALSE;
 626          }
 627          if (envExt[i] == '\0')
 628             break;
 629       }
 630       else if (envExt[i] == '-') {
 631          disableExt = GL_TRUE;
 632       }
 633       else {
 634          /* accumulate this non-space character */
 635          ext[extLen++] = envExt[i];
 636       }
 637    }
 638
 639    return extraExt;
 640 }
 641
 642
 643 /**
 644  * Run through the default_extensions array above and set the
 645  * ctx->Extensions.ARB/EXT_* flags accordingly.
 646  * To be called during context initialization.
 647  */
 648 void
 649 _mesa_init_extensions( GLcontext *ctx )
 650 {
 651    GLboolean *base = (GLboolean *) &ctx->Extensions;
 652    GLuint i;
 653
 654    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 655       if (default_extensions[i].enabled &&
 656           default_extensions[i].flag_offset) {
 657          *(base + default_extensions[i].flag_offset) = GL_TRUE;
 658       }
 659    }
 660 }
 661
 662
 663 /**
 664  * Construct the GL_EXTENSIONS string.  Called the first time that
 665  * glGetString(GL_EXTENSIONS) is called.
 666  */
 667 GLubyte *
 668 _mesa_make_extension_string( GLcontext *ctx )
 669 {
 670    const char *extraExt = get_extension_override(ctx);
 671    GLuint extStrLen = 0;
 672    char *s;
 673    GLuint i;
 674
 675    /* first, compute length of the extension string */
 676    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 677       if (extension_enabled(ctx, i)) {
 678          extStrLen += (GLuint)_mesa_strlen(default_extensions[i].name) + 1;
 679       }
 680    }
 681
 682    if (extraExt)
 683       extStrLen += _mesa_strlen(extraExt) + 1; /* +1 for space */
 684
 685    /* allocate the extension string */
 686    s = (char *) _mesa_malloc(extStrLen);
 687    if (!s)
 688       return NULL;
 689
 690    /* second, build the extension string */
 691    extStrLen = 0;
 692    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 693       if (extension_enabled(ctx, i)) {
 694          GLuint len = (GLuint)_mesa_strlen(default_extensions[i].name);
 695          _mesa_memcpy(s + extStrLen, default_extensions[i].name, len);
 696          extStrLen += len;
 697          s[extStrLen] = ' ';
 698          extStrLen++;
 699       }
 700    }
 701    ASSERT(extStrLen > 0);
 702
 703    s[extStrLen - 1] = 0; /* -1 to overwrite trailing the ' ' */
 704
 705    if (extraExt) {
 706       s = append(s, " ");
 707       s = append(s, extraExt);
 708    }
 709
 710    return (GLubyte *) s;
 711 }
 712
 713
 714 /**
 715  * Return number of enabled extensions.
 716  */
 717 GLuint
 718 _mesa_get_extension_count(GLcontext *ctx)
 719 {
 720    GLuint i;
 721
 722    /* only count once */
 723    if (!ctx->Extensions.Count) {
 724       for (i = 0; i < Elements(default_extensions); i++) {
 725          if (extension_enabled(ctx, i)) {
 726             ctx->Extensions.Count++;
 727          }
 728       }
 729    }
 730
 731    if (0)
 732       _mesa_debug(ctx, "%u of %d extensions enabled\n", ctx->Extensions.Count,
 733                   Elements(default_extensions));
 734
 735    return ctx->Extensions.Count;
 736 }
 737
 738
 739 /**
 740  * Return name of i-th enabled extension
 741  */
 742 const GLubyte *
 743 _mesa_get_enabled_extension(GLcontext *ctx, GLuint index)
 744 {
 745    GLuint i;
 746
 747    for (i = 0; i < Elements(default_extensions); i++) {
 748       if (extension_enabled(ctx, i)) {
 749          if (index == 0)
 750             return (const GLubyte *) default_extensions[i].name;
 751          index--;
 752       }
 753    }
 754
 755    return NULL;
 756 }