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