src/mesa/main/extensions.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.3
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 #include "glheader.h"
  27 #include "imports.h"
  28 #include "context.h"
  29 #include "extensions.h"
  30 #include "simple_list.h"
  31 #include "mtypes.h"
  32
  33
  34 #define F(x) offsetof(struct gl_extensions, x)
  35 #define ON GL_TRUE
  36 #define OFF GL_FALSE
  37
  38
  39 /*
  40  * Note: The GL_MESAX_* extensions are placeholders for future ARB extensions.
  41  */
  42 static const struct {
  43    GLboolean enabled;
  44    const char *name;
  45    int flag_offset;
  46 } default_extensions[] = {
  47    { OFF, "GL_ARB_copy_buffer",                F(ARB_copy_buffer) },
  48    { OFF, "GL_ARB_depth_texture",              F(ARB_depth_texture) },
  49    { ON,  "GL_ARB_draw_buffers",               F(ARB_draw_buffers) },
  50    { OFF, "GL_ARB_fragment_program",           F(ARB_fragment_program) },
  51    { OFF, "GL_ARB_fragment_program_shadow",    F(ARB_fragment_program_shadow) },
  52    { OFF, "GL_ARB_fragment_shader",            F(ARB_fragment_shader) },
  53    { OFF, "GL_ARB_framebuffer_object",         F(ARB_framebuffer_object) },
  54    { OFF, "GL_ARB_half_float_pixel",           F(ARB_half_float_pixel) },
  55    { OFF, "GL_ARB_imaging",                    F(ARB_imaging) },
  56    { ON,  "GL_ARB_multisample",                F(ARB_multisample) },
  57    { OFF, "GL_ARB_multitexture",               F(ARB_multitexture) },
  58    { OFF, "GL_ARB_occlusion_query",            F(ARB_occlusion_query) },
  59    { OFF, "GL_ARB_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
  60    { OFF, "GL_ARB_point_parameters",           F(EXT_point_parameters) },
  61    { OFF, "GL_ARB_point_sprite",               F(ARB_point_sprite) },
  62    { OFF, "GL_ARB_shader_objects",             F(ARB_shader_objects) },
  63    { OFF, "GL_ARB_shading_language_100",       F(ARB_shading_language_100) },
  64    { OFF, "GL_ARB_shading_language_120",       F(ARB_shading_language_120) },
  65    { OFF, "GL_ARB_shadow",                     F(ARB_shadow) },
  66    { OFF, "GL_ARB_shadow_ambient",             F(ARB_shadow_ambient) },
  67    { OFF, "GL_ARB_texture_border_clamp",       F(ARB_texture_border_clamp) },
  68    { ON,  "GL_ARB_texture_compression",        F(ARB_texture_compression) },
  69    { OFF, "GL_ARB_texture_cube_map",           F(ARB_texture_cube_map) },
  70    { OFF, "GL_ARB_texture_env_add",            F(EXT_texture_env_add) },
  71    { OFF, "GL_ARB_texture_env_combine",        F(ARB_texture_env_combine) },
  72    { OFF, "GL_ARB_texture_env_crossbar",       F(ARB_texture_env_crossbar) },
  73    { OFF, "GL_ARB_texture_env_dot3",           F(ARB_texture_env_dot3) },
  74    { OFF, "GL_MESAX_texture_float",            F(ARB_texture_float) },
  75    { OFF, "GL_ARB_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
  76    { OFF, "GL_ARB_texture_non_power_of_two",   F(ARB_texture_non_power_of_two)},
  77    { OFF, "GL_ARB_texture_rectangle",          F(NV_texture_rectangle) },
  78    { ON,  "GL_ARB_transpose_matrix",           F(ARB_transpose_matrix) },
  79    { ON,  "GL_ARB_vertex_buffer_object",       F(ARB_vertex_buffer_object) },
  80    { OFF, "GL_ARB_vertex_program",             F(ARB_vertex_program) },
  81    { OFF, "GL_ARB_vertex_shader",              F(ARB_vertex_shader) },
  82    { ON,  "GL_ARB_window_pos",                 F(ARB_window_pos) },
  83    { ON,  "GL_EXT_abgr",                       F(EXT_abgr) },
  84    { ON,  "GL_EXT_bgra",                       F(EXT_bgra) },
  85    { OFF, "GL_EXT_blend_color",                F(EXT_blend_color) },
  86    { OFF, "GL_EXT_blend_equation_separate",    F(EXT_blend_equation_separate) },
  87    { OFF, "GL_EXT_blend_func_separate",        F(EXT_blend_func_separate) },
  88    { OFF, "GL_EXT_blend_logic_op",             F(EXT_blend_logic_op) },
  89    { OFF, "GL_EXT_blend_minmax",               F(EXT_blend_minmax) },
  90    { OFF, "GL_EXT_blend_subtract",             F(EXT_blend_subtract) },
  91    { OFF, "GL_EXT_clip_volume_hint",           F(EXT_clip_volume_hint) },
  92    { OFF, "GL_EXT_cull_vertex",                F(EXT_cull_vertex) },
  93    { ON,  "GL_EXT_compiled_vertex_array",      F(EXT_compiled_vertex_array) },
  94    { OFF, "GL_EXT_convolution",                F(EXT_convolution) },
  95    { ON,  "GL_EXT_copy_texture",               F(EXT_copy_texture) },
  96    { OFF, "GL_EXT_depth_bounds_test",          F(EXT_depth_bounds_test) },
  97    { ON,  "GL_EXT_draw_range_elements",        F(EXT_draw_range_elements) },
  98    { OFF, "GL_EXT_framebuffer_object",         F(EXT_framebuffer_object) },
  99    { OFF, "GL_EXT_framebuffer_blit",           F(EXT_framebuffer_blit) },
 100    { OFF, "GL_EXT_fog_coord",                  F(EXT_fog_coord) },
 101    { OFF, "GL_EXT_gpu_program_parameters",     F(EXT_gpu_program_parameters) },
 102    { OFF, "GL_EXT_histogram",                  F(EXT_histogram) },
 103    { ON,  "GL_EXT_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
 104    { OFF, "GL_EXT_packed_depth_stencil",       F(EXT_packed_depth_stencil) },
 105    { ON,  "GL_EXT_packed_pixels",              F(EXT_packed_pixels) },
 106    { OFF, "GL_EXT_paletted_texture",           F(EXT_paletted_texture) },
 107    { OFF, "GL_EXT_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
 108    { OFF, "GL_EXT_point_parameters",           F(EXT_point_parameters) },
 109    { ON,  "GL_EXT_polygon_offset",             F(EXT_polygon_offset) },
 110    { ON,  "GL_EXT_rescale_normal",             F(EXT_rescale_normal) },
 111    { OFF, "GL_EXT_secondary_color",            F(EXT_secondary_color) },
 112    { ON,  "GL_EXT_separate_specular_color",    F(EXT_separate_specular_color) },
 113    { OFF, "GL_EXT_shadow_funcs",               F(EXT_shadow_funcs) },
 114    { OFF, "GL_EXT_shared_texture_palette",     F(EXT_shared_texture_palette) },
 115    { OFF, "GL_EXT_stencil_two_side",           F(EXT_stencil_two_side) },
 116    { OFF, "GL_EXT_stencil_wrap",               F(EXT_stencil_wrap) },
 117    { ON,  "GL_EXT_subtexture",                 F(EXT_subtexture) },
 118    { ON,  "GL_EXT_texture",                    F(EXT_texture) },
 119    { ON,  "GL_EXT_texture3D",                  F(EXT_texture3D) },
 120    { OFF, "GL_EXT_texture_compression_s3tc",   F(EXT_texture_compression_s3tc) },
 121    { ON,  "GL_EXT_texture_edge_clamp",         F(SGIS_texture_edge_clamp) },
 122    { OFF, "GL_EXT_texture_env_add",            F(EXT_texture_env_add) },
 123    { OFF, "GL_EXT_texture_env_combine",        F(EXT_texture_env_combine) },
 124    { OFF, "GL_EXT_texture_env_dot3",           F(EXT_texture_env_dot3) },
 125    { OFF, "GL_EXT_texture_filter_anisotropic", F(EXT_texture_filter_anisotropic) },
 126    { OFF, "GL_EXT_texture_lod_bias",           F(EXT_texture_lod_bias) },
 127    { OFF, "GL_EXT_texture_mirror_clamp",       F(EXT_texture_mirror_clamp) },
 128    { ON,  "GL_EXT_texture_object",             F(EXT_texture_object) },
 129    { OFF, "GL_EXT_texture_rectangle",          F(NV_texture_rectangle) },
 130    { OFF, "GL_EXT_texture_sRGB",               F(EXT_texture_sRGB) },
 131    { OFF, "GL_EXT_texture_swizzle",            F(EXT_texture_swizzle) },
 132    { OFF, "GL_EXT_timer_query",                F(EXT_timer_query) },
 133    { ON,  "GL_EXT_vertex_array",               F(EXT_vertex_array) },
 134    { OFF, "GL_EXT_vertex_array_bgra",          F(EXT_vertex_array_bgra) },
 135    { OFF, "GL_EXT_vertex_array_set",           F(EXT_vertex_array_set) },
 136    { OFF, "GL_3DFX_texture_compression_FXT1",  F(TDFX_texture_compression_FXT1) },
 137    { OFF, "GL_APPLE_client_storage",           F(APPLE_client_storage) },
 138    { ON,  "GL_APPLE_packed_pixels",            F(APPLE_packed_pixels) },
 139    { OFF, "GL_APPLE_vertex_array_object",      F(APPLE_vertex_array_object) },
 140    { OFF, "GL_ATI_blend_equation_separate",    F(EXT_blend_equation_separate) },
 141    { OFF, "GL_ATI_envmap_bumpmap",             F(ATI_envmap_bumpmap) },
 142    { OFF, "GL_ATI_texture_env_combine3",       F(ATI_texture_env_combine3)},
 143    { OFF, "GL_ATI_texture_mirror_once",        F(ATI_texture_mirror_once)},
 144    { OFF, "GL_ATI_fragment_shader",            F(ATI_fragment_shader)},
 145    { OFF, "GL_ATI_separate_stencil",           F(ATI_separate_stencil)},
 146    { ON,  "GL_IBM_multimode_draw_arrays",      F(IBM_multimode_draw_arrays) },
 147    { ON,  "GL_IBM_rasterpos_clip",             F(IBM_rasterpos_clip) },
 148    { OFF, "GL_IBM_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
 149    { OFF, "GL_INGR_blend_func_separate",       F(EXT_blend_func_separate) },
 150    { OFF, "GL_MESA_pack_invert",               F(MESA_pack_invert) },
 151    { OFF, "GL_MESA_packed_depth_stencil",      F(MESA_packed_depth_stencil) },
 152    { OFF, "GL_MESA_resize_buffers",            F(MESA_resize_buffers) },
 153    { OFF, "GL_MESA_texture_array",             F(MESA_texture_array) },
 154    { OFF, "GL_MESA_texture_signed_rgba",       F(MESA_texture_signed_rgba) },
 155    { OFF, "GL_MESA_ycbcr_texture",             F(MESA_ycbcr_texture) },
 156    { ON,  "GL_MESA_window_pos",                F(ARB_window_pos) },
 157    { OFF, "GL_NV_blend_square",                F(NV_blend_square) },
 158    { OFF, "GL_NV_fragment_program",            F(NV_fragment_program) },
 159    { ON,  "GL_NV_light_max_exponent",          F(NV_light_max_exponent) },
 160    { OFF, "GL_NV_point_sprite",                F(NV_point_sprite) },
 161    { OFF, "GL_NV_texture_env_combine4",        F(NV_texture_env_combine4) },
 162    { OFF, "GL_NV_texture_rectangle",           F(NV_texture_rectangle) },
 163    { ON,  "GL_NV_texgen_reflection",           F(NV_texgen_reflection) },
 164    { OFF, "GL_NV_vertex_program",              F(NV_vertex_program) },
 165    { OFF, "GL_NV_vertex_program1_1",           F(NV_vertex_program1_1) },
 166    { ON,  "GL_OES_read_format",                F(OES_read_format) },
 167    { OFF, "GL_SGI_color_matrix",               F(SGI_color_matrix) },
 168    { OFF, "GL_SGI_color_table",                F(SGI_color_table) },
 169    { OFF, "GL_SGI_texture_color_table",        F(SGI_texture_color_table) },
 170    { OFF, "GL_SGIS_generate_mipmap",           F(SGIS_generate_mipmap) },
 171    { OFF, "GL_SGIS_texture_border_clamp",      F(ARB_texture_border_clamp) },
 172    { ON,  "GL_SGIS_texture_edge_clamp",        F(SGIS_texture_edge_clamp) },
 173    { ON,  "GL_SGIS_texture_lod",               F(SGIS_texture_lod) },
 174    { ON,  "GL_SUN_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
 175    { OFF, "GL_S3_s3tc",                        F(S3_s3tc) },
 176 };
 177
 178
 179
 180 /**
 181  * Enable all extensions suitable for a software-only renderer.
 182  * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
 183  */
 184 void
 185 _mesa_enable_sw_extensions(GLcontext *ctx)
 186 {
 187    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 188    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 189    /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
 190 #if FEATURE_ARB_fragment_program
 191    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 192    ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 193 #endif
 194 #if FEATURE_ARB_fragment_shader
 195    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 196 #endif
 197 #if FEATURE_ARB_framebuffer_object
 198    ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 199 #endif
 200    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 201    ctx->Extensions.ARB_imaging = GL_TRUE;
 202    ctx->Extensions.ARB_multitexture = GL_TRUE;
 203 #if FEATURE_ARB_occlusion_query
 204    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 205 #endif
 206    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 207 #if FEATURE_ARB_shader_objects
 208    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 209 #endif
 210 #if FEATURE_ARB_shading_language_100
 211    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 212 #endif
 213 #if FEATURE_ARB_shading_language_120
 214    ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
 215 #endif
 216    ctx->Extensions.ARB_shadow = GL_TRUE;
 217    ctx->Extensions.ARB_shadow_ambient = GL_TRUE;
 218    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 219    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 220    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 221    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 222    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 223    /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
 224    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 225    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 226 #if FEATURE_ARB_vertex_program
 227    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 228 #endif
 229 #if FEATURE_ARB_vertex_shader
 230    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 231 #endif
 232 #if FEATURE_ARB_vertex_buffer_object
 233    /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
 234 #endif
 235    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 236    ctx->Extensions.ATI_envmap_bumpmap = GL_TRUE;
 237 #if FEATURE_ATI_fragment_shader
 238    ctx->Extensions.ATI_fragment_shader = GL_TRUE;
 239 #endif
 240    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 241    ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 242    ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 243    ctx->Extensions.EXT_blend_color = GL_TRUE;
 244    ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 245    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 246    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 247    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 248    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 249    ctx->Extensions.EXT_convolution = GL_TRUE;
 250    ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
 251    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 252 #if FEATURE_EXT_framebuffer_object
 253    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 254 #endif
 255 #if FEATURE_EXT_framebuffer_blit
 256    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 257 #endif
 258    ctx->Extensions.EXT_histogram = GL_TRUE;
 259    /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
 260    ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 261    ctx->Extensions.EXT_paletted_texture = GL_TRUE;
 262 #if FEATURE_EXT_pixel_buffer_object
 263    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 264 #endif
 265    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 266    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 267    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 268    ctx->Extensions.EXT_shared_texture_palette = GL_TRUE;
 269    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 270    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 271    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 272    ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
 273    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 274    ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 275    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 276 #if FEATURE_EXT_texture_sRGB
 277    ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 278 #endif
 279    ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 280    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 281    /*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/
 282    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 283    ctx->Extensions.MESA_resize_buffers = GL_TRUE;
 284    ctx->Extensions.MESA_texture_array = GL_TRUE;
 285    ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 286    ctx->Extensions.NV_blend_square = GL_TRUE;
 287    /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
 288    ctx->Extensions.NV_point_sprite = GL_TRUE;
 289    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 290    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 291    /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
 292 #if FEATURE_NV_vertex_program
 293    ctx->Extensions.NV_vertex_program = GL_TRUE;
 294    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 295 #endif
 296 #if FEATURE_NV_fragment_program
 297    ctx->Extensions.NV_fragment_program = GL_TRUE;
 298 #endif
 299    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 300    ctx->Extensions.SGI_color_table = GL_TRUE;
 301    ctx->Extensions.SGI_texture_color_table = GL_TRUE;
 302    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 303    ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE;
 304 #if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program
 305    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 306 #endif
 307 #if FEATURE_texture_fxt1
 308    _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1");
 309 #endif
 310 #if FEATURE_texture_s3tc
 311    if (ctx->Mesa_DXTn) {
 312       _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
 313       _mesa_enable_extension(ctx, "GL_S3_s3tc");
 314    }
 315 #endif
 316 }
 317
 318
 319 /**
 320  * Enable GL_ARB_imaging and all the EXT extensions that are subsets of it.
 321  */
 322 void
 323 _mesa_enable_imaging_extensions(GLcontext *ctx)
 324 {
 325    ctx->Extensions.ARB_imaging = GL_TRUE;
 326    ctx->Extensions.EXT_blend_color = GL_TRUE;
 327    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 328    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 329    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 330    ctx->Extensions.EXT_convolution = GL_TRUE;
 331    ctx->Extensions.EXT_histogram = GL_TRUE;
 332    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 333    ctx->Extensions.SGI_color_table = GL_TRUE;
 334 }
 335
 336
 337
 338 /**
 339  * Enable all OpenGL 1.3 features and extensions.
 340  * A convenience function to be called by drivers.
 341  */
 342 void
 343 _mesa_enable_1_3_extensions(GLcontext *ctx)
 344 {
 345    /*ctx->Extensions.ARB_multisample = GL_TRUE;*/
 346    ctx->Extensions.ARB_multitexture = GL_TRUE;
 347    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 348    /*ctx->Extensions.ARB_texture_compression = GL_TRUE;*/
 349    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 350    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 351    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 352    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 353    /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
 354 }
 355
 356
 357
 358 /**
 359  * Enable all OpenGL 1.4 features and extensions.
 360  * A convenience function to be called by drivers.
 361  */
 362 void
 363 _mesa_enable_1_4_extensions(GLcontext *ctx)
 364 {
 365    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 366    ctx->Extensions.ARB_shadow = GL_TRUE;
 367    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 368    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 369    ctx->Extensions.ARB_window_pos = GL_TRUE;
 370    ctx->Extensions.EXT_blend_color = GL_TRUE;
 371    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 372    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 373    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 374    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 375    /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
 376    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 377    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 378    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 379    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 380    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 381 }
 382
 383
 384 /**
 385  * Enable all OpenGL 1.5 features and extensions.
 386  * A convenience function to be called by drivers.
 387  */
 388 void
 389 _mesa_enable_1_5_extensions(GLcontext *ctx)
 390 {
 391    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 392    /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
 393    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 394 }
 395
 396
 397 /**
 398  * Enable all OpenGL 2.0 features and extensions.
 399  * A convenience function to be called by drivers.
 400  */
 401 void
 402 _mesa_enable_2_0_extensions(GLcontext *ctx)
 403 {
 404    /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
 405 #if FEATURE_ARB_fragment_shader
 406    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 407 #endif
 408    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 409    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 410 #if FEATURE_ARB_shader_objects
 411    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 412 #endif
 413 #if FEATURE_ARB_shading_language_100
 414    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 415 #endif
 416    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 417 #if FEATURE_ARB_vertex_shader
 418    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 419 #endif
 420 }
 421
 422
 423 /**
 424  * Enable all OpenGL 2.1 features and extensions.
 425  * A convenience function to be called by drivers.
 426  */
 427 void
 428 _mesa_enable_2_1_extensions(GLcontext *ctx)
 429 {
 430 #if FEATURE_EXT_pixel_buffer_object
 431    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 432 #endif
 433 #if FEATURE_EXT_texture_sRGB
 434    ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 435 #endif
 436 #ifdef FEATURE_ARB_shading_language_120
 437    ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
 438 #endif
 439 }
 440
 441
 442
 443 /**
 444  * Either enable or disable the named extension.
 445  * \return GL_TRUE for success, GL_FALSE if invalid extension name
 446  */
 447 static GLboolean
 448 set_extension( GLcontext *ctx, const char *name, GLboolean state )
 449 {
 450    GLboolean *base = (GLboolean *) &ctx->Extensions;
 451    GLuint i;
 452
 453    if (ctx->Extensions.String) {
 454       /* The string was already queried - can't change it now! */
 455       _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
 456       return GL_FALSE;
 457    }
 458
 459    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 460       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 461          if (default_extensions[i].flag_offset) {
 462             GLboolean *enabled = base + default_extensions[i].flag_offset;
 463             *enabled = state;
 464          }
 465          return GL_TRUE;
 466       }
 467    }
 468    return GL_FALSE;
 469 }
 470
 471
 472 /**
 473  * Enable the named extension.
 474  * Typically called by drivers.
 475  */
 476 void
 477 _mesa_enable_extension( GLcontext *ctx, const char *name )
 478 {
 479    if (!set_extension(ctx, name, GL_TRUE))
 480       _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
 481 }
 482
 483
 484 /**
 485  * Disable the named extension.
 486  * XXX is this really needed???
 487  */
 488 void
 489 _mesa_disable_extension( GLcontext *ctx, const char *name )
 490 {
 491    if (!set_extension(ctx, name, GL_FALSE))
 492       _mesa_problem(ctx, "Trying to disable unknown extension: %s", name);
 493 }
 494
 495
 496 /**
 497  * Test if the named extension is enabled in this context.
 498  */
 499 GLboolean
 500 _mesa_extension_is_enabled( GLcontext *ctx, const char *name )
 501 {
 502    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 503    GLuint i;
 504
 505    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 506       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 507          if (!default_extensions[i].flag_offset)
 508             return GL_TRUE;
 509          return *(base + default_extensions[i].flag_offset);
 510       }
 511    }
 512    return GL_FALSE;
 513 }
 514
 515
 516 /**
 517  * Append string 'b' onto string 'a'.  Free 'a' and return new string.
 518  */
 519 static char *
 520 append(const char *a, const char *b)
 521 {
 522    const GLuint aLen = a ? _mesa_strlen(a) : 0;
 523    const GLuint bLen = b ? _mesa_strlen(b) : 0;
 524    char *s = _mesa_calloc(aLen + bLen + 1);
 525    if (s) {
 526       if (a)
 527          _mesa_memcpy(s, a, aLen);
 528       if (b)
 529          _mesa_memcpy(s + aLen, b, bLen);
 530       s[aLen + bLen] = '\0';
 531    }
 532    if (a)
 533       _mesa_free((void *) a);
 534    return s;
 535 }
 536
 537
 538 /**
 539  * Check the MESA_EXTENSION_OVERRIDE env var.
 540  * For extension names that are recognized, turn them on.  For extension
 541  * names that are recognized and prefixed with '-', turn them off.
 542  * Return a string of the unknown/leftover names.
 543  */
 544 static const char *
 545 get_extension_override( GLcontext *ctx )
 546 {
 547    const char *envExt = _mesa_getenv("MESA_EXTENSION_OVERRIDE");
 548    char *extraExt = NULL;
 549    char ext[1000];
 550    GLuint extLen = 0;
 551    GLuint i;
 552    GLboolean disableExt = GL_FALSE;
 553
 554    if (!envExt)
 555       return NULL;
 556
 557    for (i = 0; ; i++) {
 558       if (envExt[i] == '\0' || envExt[i] == ' ') {
 559          /* terminate/process 'ext' if extLen > 0 */
 560          if (extLen > 0) {
 561             assert(extLen < sizeof(ext));
 562             /* enable extension named by 'ext' */
 563             ext[extLen] = 0;
 564             if (!set_extension(ctx, ext, !disableExt)) {
 565                /* unknown extension name, append it to extraExt */
 566                if (extraExt) {
 567                   extraExt = append(extraExt, " ");
 568                }
 569                extraExt = append(extraExt, ext);
 570             }
 571             extLen = 0;
 572             disableExt = GL_FALSE;
 573          }
 574          if (envExt[i] == '\0')
 575             break;
 576       }
 577       else if (envExt[i] == '-') {
 578          disableExt = GL_TRUE;
 579       }
 580       else {
 581          /* accumulate this non-space character */
 582          ext[extLen++] = envExt[i];
 583       }
 584    }
 585
 586    return extraExt;
 587 }
 588
 589
 590 /**
 591  * Run through the default_extensions array above and set the
 592  * ctx->Extensions.ARB/EXT_* flags accordingly.
 593  * To be called during context initialization.
 594  */
 595 void
 596 _mesa_init_extensions( GLcontext *ctx )
 597 {
 598    GLboolean *base = (GLboolean *) &ctx->Extensions;
 599    GLuint i;
 600
 601    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 602       if (default_extensions[i].enabled &&
 603           default_extensions[i].flag_offset) {
 604          *(base + default_extensions[i].flag_offset) = GL_TRUE;
 605       }
 606    }
 607 }
 608
 609
 610 /**
 611  * Construct the GL_EXTENSIONS string.  Called the first time that
 612  * glGetString(GL_EXTENSIONS) is called.
 613  */
 614 GLubyte *
 615 _mesa_make_extension_string( GLcontext *ctx )
 616 {
 617    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 618    const char *extraExt = get_extension_override(ctx);
 619    GLuint extStrLen = 0;
 620    char *s;
 621    GLuint i;
 622
 623    /* first, compute length of the extension string */
 624    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 625       if (!default_extensions[i].flag_offset ||
 626           *(base + default_extensions[i].flag_offset)) {
 627          extStrLen += (GLuint)_mesa_strlen(default_extensions[i].name) + 1;
 628       }
 629    }
 630
 631    if (extraExt)
 632       extStrLen += _mesa_strlen(extraExt) + 1; /* +1 for space */
 633
 634    /* allocate the extension string */
 635    s = (char *) _mesa_malloc(extStrLen);
 636    if (!s)
 637       return NULL;
 638
 639    /* second, build the extension string */
 640    extStrLen = 0;
 641    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 642       if (!default_extensions[i].flag_offset ||
 643           *(base + default_extensions[i].flag_offset)) {
 644          GLuint len = (GLuint)_mesa_strlen(default_extensions[i].name);
 645          _mesa_memcpy(s + extStrLen, default_extensions[i].name, len);
 646          extStrLen += len;
 647          s[extStrLen] = ' ';
 648          extStrLen++;
 649       }
 650    }
 651    ASSERT(extStrLen > 0);
 652
 653    s[extStrLen - 1] = 0; /* -1 to overwrite trailing the ' ' */
 654
 655    if (extraExt) {
 656       s = append(s, " ");
 657       s = append(s, extraExt);
 658    }
 659
 660    return (GLubyte *) s;
 661 }