src/mesa/main/extensions.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.3
   4  *
   5  * Copyright (C) 1999-2004  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) (int)(uintptr_t)&(((struct gl_extensions *)0)->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_depth_texture",              F(ARB_depth_texture) },
  48    { OFF, "GL_ARB_draw_buffers",               F(ARB_draw_buffers) },
  49    { OFF, "GL_ARB_fragment_program",           F(ARB_fragment_program) },
  50    { OFF, "GL_ARB_fragment_shader",            F(ARB_fragment_shader) },
  51    { OFF, "GL_MESAX_half_float_pixel",         F(ARB_half_float_pixel) },
  52    { OFF, "GL_ARB_imaging",                    F(ARB_imaging) },
  53    { OFF, "GL_ARB_multisample",                F(ARB_multisample) },
  54    { OFF, "GL_ARB_multitexture",               F(ARB_multitexture) },
  55    { OFF, "GL_ARB_occlusion_query",            F(ARB_occlusion_query) },
  56    { OFF, "GL_ARB_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
  57    { OFF, "GL_ARB_point_parameters",           F(EXT_point_parameters) },
  58    { OFF, "GL_ARB_point_sprite",               F(ARB_point_sprite) },
  59    { OFF, "GL_ARB_shader_objects",             F(ARB_shader_objects) },
  60    { OFF, "GL_ARB_shading_language_100",       F(ARB_shading_language_100) },
  61    { OFF, "GL_ARB_shadow",                     F(ARB_shadow) },
  62    { OFF, "GL_ARB_shadow_ambient",             F(SGIX_shadow_ambient) },
  63    { OFF, "GL_ARB_texture_border_clamp",       F(ARB_texture_border_clamp) },
  64    { OFF, "GL_ARB_texture_compression",        F(ARB_texture_compression) },
  65    { OFF, "GL_ARB_texture_cube_map",           F(ARB_texture_cube_map) },
  66    { OFF, "GL_ARB_texture_env_add",            F(EXT_texture_env_add) },
  67    { OFF, "GL_ARB_texture_env_combine",        F(ARB_texture_env_combine) },
  68    { OFF, "GL_ARB_texture_env_crossbar",       F(ARB_texture_env_crossbar) },
  69    { OFF, "GL_ARB_texture_env_dot3",           F(ARB_texture_env_dot3) },
  70    { OFF, "GL_MESAX_texture_float",            F(ARB_texture_float) },
  71    { OFF, "GL_ARB_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
  72    { OFF, "GL_ARB_texture_non_power_of_two",   F(ARB_texture_non_power_of_two)},
  73    { OFF, "GL_ARB_texture_rectangle",          F(NV_texture_rectangle) },
  74    { ON,  "GL_ARB_transpose_matrix",           F(ARB_transpose_matrix) },
  75    { OFF, "GL_ARB_vertex_buffer_object",       F(ARB_vertex_buffer_object) },
  76    { OFF, "GL_ARB_vertex_program",             F(ARB_vertex_program) },
  77    { OFF, "GL_ARB_vertex_shader",              F(ARB_vertex_shader) },
  78    { ON,  "GL_ARB_window_pos",                 F(ARB_window_pos) },
  79    { ON,  "GL_EXT_abgr",                       F(EXT_abgr) },
  80    { ON,  "GL_EXT_bgra",                       F(EXT_bgra) },
  81    { OFF, "GL_EXT_blend_color",                F(EXT_blend_color) },
  82    { OFF, "GL_EXT_blend_equation_separate",    F(EXT_blend_equation_separate) },
  83    { OFF, "GL_EXT_blend_func_separate",        F(EXT_blend_func_separate) },
  84    { OFF, "GL_EXT_blend_logic_op",             F(EXT_blend_logic_op) },
  85    { OFF, "GL_EXT_blend_minmax",               F(EXT_blend_minmax) },
  86    { OFF, "GL_EXT_blend_subtract",             F(EXT_blend_subtract) },
  87    { ON,  "GL_EXT_clip_volume_hint",           F(EXT_clip_volume_hint) },
  88    { OFF, "GL_EXT_cull_vertex",                F(EXT_cull_vertex) },
  89    { ON,  "GL_EXT_compiled_vertex_array",      F(EXT_compiled_vertex_array) },
  90    { OFF, "GL_EXT_convolution",                F(EXT_convolution) },
  91    { ON,  "GL_EXT_copy_texture",               F(EXT_copy_texture) },
  92    { OFF, "GL_EXT_depth_bounds_test",          F(EXT_depth_bounds_test) },
  93    { ON,  "GL_EXT_draw_range_elements",        F(EXT_draw_range_elements) },
  94    { OFF, "GL_EXT_framebuffer_object",         F(EXT_framebuffer_object) },
  95    { OFF, "GL_EXT_fog_coord",                  F(EXT_fog_coord) },
  96    { OFF, "GL_EXT_histogram",                  F(EXT_histogram) },
  97    { OFF, "GL_EXT_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
  98    { ON,  "GL_EXT_packed_pixels",              F(EXT_packed_pixels) },
  99    { OFF, "GL_EXT_paletted_texture",           F(EXT_paletted_texture) },
 100    { OFF, "GL_EXT_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
 101    { OFF, "GL_EXT_point_parameters",           F(EXT_point_parameters) },
 102    { ON,  "GL_EXT_polygon_offset",             F(EXT_polygon_offset) },
 103    { ON,  "GL_EXT_rescale_normal",             F(EXT_rescale_normal) },
 104    { OFF, "GL_EXT_secondary_color",            F(EXT_secondary_color) },
 105    { ON,  "GL_EXT_separate_specular_color",    F(EXT_separate_specular_color) },
 106    { OFF, "GL_EXT_shadow_funcs",               F(EXT_shadow_funcs) },
 107    { OFF, "GL_EXT_shared_texture_palette",     F(EXT_shared_texture_palette) },
 108    { OFF, "GL_EXT_stencil_two_side",           F(EXT_stencil_two_side) },
 109    { OFF, "GL_EXT_stencil_wrap",               F(EXT_stencil_wrap) },
 110    { ON,  "GL_EXT_subtexture",                 F(EXT_subtexture) },
 111    { ON,  "GL_EXT_texture",                    F(EXT_texture) },
 112    { ON,  "GL_EXT_texture3D",                  F(EXT_texture3D) },
 113    { OFF, "GL_EXT_texture_compression_s3tc",   F(EXT_texture_compression_s3tc) },
 114    { ON,  "GL_EXT_texture_edge_clamp",         F(SGIS_texture_edge_clamp) },
 115    { OFF, "GL_EXT_texture_env_add",            F(EXT_texture_env_add) },
 116    { OFF, "GL_EXT_texture_env_combine",        F(EXT_texture_env_combine) },
 117    { OFF, "GL_EXT_texture_env_dot3",           F(EXT_texture_env_dot3) },
 118    { OFF, "GL_EXT_texture_filter_anisotropic", F(EXT_texture_filter_anisotropic) },
 119    { OFF, "GL_EXT_texture_lod_bias",           F(EXT_texture_lod_bias) },
 120    { OFF, "GL_EXT_texture_mirror_clamp",       F(EXT_texture_mirror_clamp) },
 121    { ON,  "GL_EXT_texture_object",             F(EXT_texture_object) },
 122    { OFF, "GL_EXT_texture_rectangle",          F(NV_texture_rectangle) },
 123    { ON,  "GL_EXT_vertex_array",               F(EXT_vertex_array) },
 124    { OFF, "GL_EXT_vertex_array_set",           F(EXT_vertex_array_set) },
 125    { OFF, "GL_3DFX_texture_compression_FXT1",  F(TDFX_texture_compression_FXT1) },
 126    { OFF, "GL_APPLE_client_storage",           F(APPLE_client_storage) },
 127    { ON,  "GL_APPLE_packed_pixels",            F(APPLE_packed_pixels) },
 128    { OFF, "GL_ATI_blend_equation_separate",    F(EXT_blend_equation_separate) },
 129    { OFF, "GL_ATI_texture_env_combine3",       F(ATI_texture_env_combine3)},
 130    { OFF, "GL_ATI_texture_mirror_once",        F(ATI_texture_mirror_once)},
 131    { OFF, "GL_ATI_fragment_shader",            F(ATI_fragment_shader)},
 132    { OFF, "GL_HP_occlusion_test",              F(HP_occlusion_test) },
 133    { OFF, "GL_IBM_multimode_draw_arrays",      F(IBM_multimode_draw_arrays) },
 134    { ON,  "GL_IBM_rasterpos_clip",             F(IBM_rasterpos_clip) },
 135    { OFF, "GL_IBM_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
 136    { OFF, "GL_INGR_blend_func_separate",       F(EXT_blend_func_separate) },
 137    { OFF, "GL_MESA_pack_invert",               F(MESA_pack_invert) },
 138    { OFF, "GL_MESA_packed_depth_stencil",      F(MESA_packed_depth_stencil) },
 139    { OFF, "GL_MESA_program_debug",             F(MESA_program_debug) },
 140    { OFF, "GL_MESA_resize_buffers",            F(MESA_resize_buffers) },
 141    { OFF, "GL_MESA_ycbcr_texture",             F(MESA_ycbcr_texture) },
 142    { ON,  "GL_MESA_window_pos",                F(ARB_window_pos) },
 143    { OFF, "GL_NV_blend_square",                F(NV_blend_square) },
 144    { OFF, "GL_NV_fragment_program",            F(NV_fragment_program) },
 145    { ON,  "GL_NV_light_max_exponent",          F(NV_light_max_exponent) },
 146    { OFF, "GL_NV_point_sprite",                F(NV_point_sprite) },
 147    { OFF, "GL_NV_texture_rectangle",           F(NV_texture_rectangle) },
 148    { ON,  "GL_NV_texgen_reflection",           F(NV_texgen_reflection) },
 149    { OFF, "GL_NV_vertex_program",              F(NV_vertex_program) },
 150    { OFF, "GL_NV_vertex_program1_1",           F(NV_vertex_program1_1) },
 151    { ON,  "GL_OES_read_format",                F(OES_read_format) },
 152    { OFF, "GL_SGI_color_matrix",               F(SGI_color_matrix) },
 153    { OFF, "GL_SGI_color_table",                F(SGI_color_table) },
 154    { OFF, "GL_SGI_texture_color_table",        F(SGI_texture_color_table) },
 155    { OFF, "GL_SGIS_generate_mipmap",           F(SGIS_generate_mipmap) },
 156    { OFF, "GL_SGIS_pixel_texture",             F(SGIS_pixel_texture) },
 157    { OFF, "GL_SGIS_texture_border_clamp",      F(ARB_texture_border_clamp) },
 158    { ON,  "GL_SGIS_texture_edge_clamp",        F(SGIS_texture_edge_clamp) },
 159    { ON,  "GL_SGIS_texture_lod",               F(SGIS_texture_lod) },
 160    { OFF, "GL_SGIX_depth_texture",             F(SGIX_depth_texture) },
 161    { OFF, "GL_SGIX_pixel_texture",             F(SGIX_pixel_texture) },
 162    { OFF, "GL_SGIX_shadow",                    F(SGIX_shadow) },
 163    { OFF, "GL_SGIX_shadow_ambient",            F(SGIX_shadow_ambient) },
 164    { OFF, "GL_SUN_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
 165    { OFF, "GL_S3_s3tc",                        F(S3_s3tc) },
 166 };
 167
 168
 169
 170 /**
 171  * Enable all extensions suitable for a software-only renderer.
 172  * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
 173  */
 174 void
 175 _mesa_enable_sw_extensions(GLcontext *ctx)
 176 {
 177    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 178    ctx->Extensions.ARB_draw_buffers = GL_TRUE;
 179 #if FEATURE_ARB_fragment_program
 180    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 181 #endif
 182 #if FEATURE_ARB_fragment_shader
 183    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 184 #endif
 185    /*ctx->Extensions.ARB_half_float_pixel = GL_TRUE;*/
 186    ctx->Extensions.ARB_imaging = GL_TRUE;
 187    ctx->Extensions.ARB_multitexture = GL_TRUE;
 188 #if FEATURE_ARB_occlusion_query
 189    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 190 #endif
 191    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 192 #if FEATURE_ARB_shader_objects
 193    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 194 #endif
 195 #if FEATURE_ARB_shading_language_100
 196    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 197 #endif
 198    ctx->Extensions.ARB_shadow = GL_TRUE;
 199    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 200    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 201    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 202    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 203    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 204    /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
 205    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 206    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 207 #if FEATURE_ARB_vertex_program
 208    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 209 #endif
 210 #if FEATURE_ARB_vertex_shader
 211    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 212 #endif
 213 #if FEATURE_ARB_vertex_buffer_object
 214    ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
 215 #endif
 216 #if FEATURE_ATI_fragment_shader
 217    ctx->Extensions.ATI_fragment_shader = GL_TRUE;
 218 #endif
 219    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 220    ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 221    ctx->Extensions.EXT_blend_color = GL_TRUE;
 222    ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 223    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 224    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 225    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 226    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 227    ctx->Extensions.EXT_convolution = GL_TRUE;
 228    ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
 229    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 230    ctx->Extensions.EXT_framebuffer_object = GL_TRUE; /*FALSE;*/
 231    ctx->Extensions.EXT_histogram = GL_TRUE;
 232    ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
 233    ctx->Extensions.EXT_paletted_texture = GL_TRUE;
 234 #if FEATURE_EXT_pixel_buffer_object
 235    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 236 #endif
 237    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 238    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 239    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 240    ctx->Extensions.EXT_shared_texture_palette = GL_TRUE;
 241    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 242    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 243    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 244    ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
 245    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 246    ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 247    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 248    ctx->Extensions.HP_occlusion_test = GL_TRUE;
 249    ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;
 250    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 251 #if FEATURE_MESA_program_debug
 252    ctx->Extensions.MESA_program_debug = GL_TRUE;
 253 #endif
 254    ctx->Extensions.MESA_resize_buffers = GL_TRUE;
 255    ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 256    ctx->Extensions.NV_blend_square = GL_TRUE;
 257    /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
 258    ctx->Extensions.NV_point_sprite = GL_TRUE;
 259    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 260    /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
 261 #if FEATURE_NV_vertex_program
 262    ctx->Extensions.NV_vertex_program = GL_TRUE;
 263    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 264 #endif
 265 #if FEATURE_NV_fragment_program
 266    ctx->Extensions.NV_fragment_program = GL_TRUE;
 267 #endif
 268    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 269    ctx->Extensions.SGI_color_table = GL_TRUE;
 270    ctx->Extensions.SGI_texture_color_table = GL_TRUE;
 271    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 272    ctx->Extensions.SGIS_pixel_texture = GL_TRUE;
 273    ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE;
 274    ctx->Extensions.SGIX_depth_texture = GL_TRUE;
 275    ctx->Extensions.SGIX_pixel_texture = GL_TRUE;
 276    ctx->Extensions.SGIX_shadow = GL_TRUE;
 277    ctx->Extensions.SGIX_shadow_ambient = GL_TRUE;
 278 }
 279
 280
 281 /**
 282  * Enable GL_ARB_imaging and all the EXT extensions that are subsets of it.
 283  */
 284 void
 285 _mesa_enable_imaging_extensions(GLcontext *ctx)
 286 {
 287    ctx->Extensions.ARB_imaging = GL_TRUE;
 288    ctx->Extensions.EXT_blend_color = GL_TRUE;
 289    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 290    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 291    ctx->Extensions.EXT_convolution = GL_TRUE;
 292    ctx->Extensions.EXT_histogram = GL_TRUE;
 293    ctx->Extensions.SGI_color_matrix = GL_TRUE;
 294    ctx->Extensions.SGI_color_table = GL_TRUE;
 295 }
 296
 297
 298
 299 /**
 300  * Enable all OpenGL 1.3 features and extensions.
 301  * A convenience function to be called by drivers.
 302  */
 303 void
 304 _mesa_enable_1_3_extensions(GLcontext *ctx)
 305 {
 306    ctx->Extensions.ARB_multisample = GL_TRUE;
 307    ctx->Extensions.ARB_multitexture = GL_TRUE;
 308    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
 309    ctx->Extensions.ARB_texture_compression = GL_TRUE;
 310    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 311    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 312    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 313    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 314    /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
 315 }
 316
 317
 318
 319 /**
 320  * Enable all OpenGL 1.4 features and extensions.
 321  * A convenience function to be called by drivers.
 322  */
 323 void
 324 _mesa_enable_1_4_extensions(GLcontext *ctx)
 325 {
 326    ctx->Extensions.ARB_depth_texture = GL_TRUE;
 327    ctx->Extensions.ARB_shadow = GL_TRUE;
 328    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 329    ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 330    ctx->Extensions.ARB_window_pos = GL_TRUE;
 331    ctx->Extensions.EXT_blend_color = GL_TRUE;
 332    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 333    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 334    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 335    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 336    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 337    ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
 338    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 339    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 340    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 341    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 342    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 343 }
 344
 345
 346 /**
 347  * Enable all OpenGL 1.5 features and extensions.
 348  * A convenience function to be called by drivers.
 349  */
 350 void
 351 _mesa_enable_1_5_extensions(GLcontext *ctx)
 352 {
 353    ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 354    ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
 355    ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 356 }
 357
 358
 359 /**
 360  * Enable all OpenGL 2.0 features and extensions.
 361  * A convenience function to be called by drivers.
 362  */
 363 void
 364 _mesa_enable_2_0_extensions(GLcontext *ctx)
 365 {
 366    ctx->Extensions.ARB_draw_buffers = GL_TRUE;
 367 #if FEATURE_ARB_fragment_shader
 368    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 369 #endif
 370    ctx->Extensions.ARB_point_sprite = GL_TRUE;
 371    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 372 #if FEATURE_ARB_shader_objects
 373    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 374 #endif
 375 #if FEATURE_ARB_shading_language_100
 376    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 377 #endif
 378    ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 379 #if FEATURE_ARB_vertex_shader
 380    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 381 #endif
 382 }
 383
 384
 385
 386 /**
 387  * Either enable or disable the named extension.
 388  */
 389 static void
 390 set_extension( GLcontext *ctx, const char *name, GLboolean state )
 391 {
 392    GLboolean *base = (GLboolean *) &ctx->Extensions;
 393    GLuint i;
 394
 395    if (ctx->Extensions.String) {
 396       /* The string was already queried - can't change it now! */
 397       _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
 398       return;
 399    }
 400
 401    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 402       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 403          if (default_extensions[i].flag_offset) {
 404             GLboolean *enabled = base + default_extensions[i].flag_offset;
 405             *enabled = state;
 406          }
 407          return;
 408       }
 409    }
 410    _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
 411 }
 412
 413
 414 /**
 415  * Enable the named extension.
 416  * Typically called by drivers.
 417  */
 418 void
 419 _mesa_enable_extension( GLcontext *ctx, const char *name )
 420 {
 421    set_extension(ctx, name, GL_TRUE);
 422 }
 423
 424
 425 /**
 426  * Disable the named extension.
 427  * XXX is this really needed???
 428  */
 429 void
 430 _mesa_disable_extension( GLcontext *ctx, const char *name )
 431 {
 432    set_extension(ctx, name, GL_FALSE);
 433 }
 434
 435
 436 /**
 437  * Test if the named extension is enabled in this context.
 438  */
 439 GLboolean
 440 _mesa_extension_is_enabled( GLcontext *ctx, const char *name )
 441 {
 442    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 443    GLuint i;
 444
 445    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 446       if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
 447          if (!default_extensions[i].flag_offset)
 448             return GL_TRUE;
 449          return *(base + default_extensions[i].flag_offset);
 450       }
 451    }
 452    return GL_FALSE;
 453 }
 454
 455
 456 /**
 457  * Run through the default_extensions array above and set the
 458  * ctx->Extensions.ARB/EXT_* flags accordingly.
 459  * To be called during context initialization.
 460  */
 461 void
 462 _mesa_init_extensions( GLcontext *ctx )
 463 {
 464    GLboolean *base = (GLboolean *) &ctx->Extensions;
 465    GLuint i;
 466
 467    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 468       if (default_extensions[i].enabled &&
 469           default_extensions[i].flag_offset) {
 470          *(base + default_extensions[i].flag_offset) = GL_TRUE;
 471       }
 472    }
 473 }
 474
 475
 476 /**
 477  * Construct the GL_EXTENSIONS string.  Called the first time that
 478  * glGetString(GL_EXTENSIONS) is called.
 479  */
 480 GLubyte *
 481 _mesa_make_extension_string( GLcontext *ctx )
 482 {
 483    const GLboolean *base = (const GLboolean *) &ctx->Extensions;
 484    GLuint extStrLen = 0;
 485    GLubyte *s;
 486    GLuint i;
 487
 488    /* first, compute length of the extension string */
 489    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 490       if (!default_extensions[i].flag_offset ||
 491           *(base + default_extensions[i].flag_offset)) {
 492          extStrLen += (GLuint)_mesa_strlen(default_extensions[i].name) + 1;
 493       }
 494    }
 495    s = (GLubyte *) _mesa_malloc(extStrLen);
 496
 497    /* second, build the extension string */
 498    extStrLen = 0;
 499    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 500       if (!default_extensions[i].flag_offset ||
 501           *(base + default_extensions[i].flag_offset)) {
 502          GLuint len = (GLuint)_mesa_strlen(default_extensions[i].name);
 503          _mesa_memcpy(s + extStrLen, default_extensions[i].name, len);
 504          extStrLen += len;
 505          s[extStrLen] = (GLubyte) ' ';
 506          extStrLen++;
 507       }
 508    }
 509    ASSERT(extStrLen > 0);
 510
 511    s[extStrLen - 1] = 0;
 512
 513    return s;
 514 }