src/mesa/state_tracker/st_extensions.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * Copyright (c) 2008 VMware, Inc.
   5  * 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
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 #include "main/imports.h"
  30 #include "main/context.h"
  31 #include "main/macros.h"
  32 #include "main/mfeatures.h"
  33
  34 #include "pipe/p_context.h"
  35 #include "pipe/p_defines.h"
  36 #include "pipe/p_screen.h"
  37
  38 #include "st_context.h"
  39 #include "st_extensions.h"
  40
  41
  42 static int _min(int a, int b)
  43 {
  44    return (a < b) ? a : b;
  45 }
  46
  47 static float _maxf(float a, float b)
  48 {
  49    return (a > b) ? a : b;
  50 }
  51
  52 static int _clamp(int a, int min, int max)
  53 {
  54    if (a < min)
  55       return min;
  56    else if (a > max)
  57       return max;
  58    else
  59       return a;
  60 }
  61
  62
  63 /**
  64  * Query driver to get implementation limits.
  65  * Note that we have to limit/clamp against Mesa's internal limits too.
  66  */
  67 void st_init_limits(struct st_context *st)
  68 {
  69    struct pipe_screen *screen = st->pipe->screen;
  70    struct gl_constants *c = &st->ctx->Const;
  71    gl_shader_type sh;
  72
  73    c->MaxTextureLevels
  74       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),
  75             MAX_TEXTURE_LEVELS);
  76
  77    c->Max3DTextureLevels
  78       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_3D_LEVELS),
  79             MAX_3D_TEXTURE_LEVELS);
  80
  81    c->MaxCubeTextureLevels
  82       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS),
  83             MAX_CUBE_TEXTURE_LEVELS);
  84
  85    c->MaxTextureRectSize
  86       = _min(1 << (c->MaxTextureLevels - 1), MAX_TEXTURE_RECT_SIZE);
  87
  88    c->MaxTextureImageUnits
  89       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS),
  90             MAX_TEXTURE_IMAGE_UNITS);
  91
  92    c->MaxVertexTextureImageUnits
  93       = _min(screen->get_param(screen, PIPE_CAP_MAX_VERTEX_TEXTURE_UNITS),
  94              MAX_VERTEX_TEXTURE_IMAGE_UNITS);
  95
  96    c->MaxCombinedTextureImageUnits
  97       = _min(screen->get_param(screen, PIPE_CAP_MAX_COMBINED_SAMPLERS),
  98              MAX_COMBINED_TEXTURE_IMAGE_UNITS);
  99
 100    c->MaxTextureCoordUnits
 101       = _min(c->MaxTextureImageUnits, MAX_TEXTURE_COORD_UNITS);
 102
 103    c->MaxTextureUnits = _min(c->MaxTextureImageUnits, c->MaxTextureCoordUnits);
 104
 105    c->MaxDrawBuffers
 106       = _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 107               1, MAX_DRAW_BUFFERS);
 108
 109    c->MaxLineWidth
 110       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH));
 111    c->MaxLineWidthAA
 112       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH_AA));
 113
 114    c->MaxPointSize
 115       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH));
 116    c->MaxPointSizeAA
 117       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH_AA));
 118    /* called after _mesa_create_context/_mesa_init_point, fix default user
 119     * settable max point size up
 120     */
 121    st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);
 122    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
 123     * for non-aa sizes, but we can go down to 0.0 for aa points.
 124     */
 125    c->MinPointSize = 1.0f;
 126    c->MinPointSizeAA = 0.0f;
 127
 128    c->MaxTextureMaxAnisotropy
 129       = _maxf(2.0f, screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_ANISOTROPY));
 130
 131    c->MaxTextureLodBias
 132       = screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_LOD_BIAS);
 133
 134    c->MaxDrawBuffers
 135       = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 136               1, MAX_DRAW_BUFFERS);
 137
 138    /* Quads always follow GL provoking rules. */
 139    c->QuadsFollowProvokingVertexConvention = GL_FALSE;
 140
 141    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh) {
 142       struct gl_shader_compiler_options *options =
 143          &st->ctx->ShaderCompilerOptions[sh];
 144       struct gl_program_constants *pc;
 145
 146       switch (sh) {
 147       case PIPE_SHADER_FRAGMENT:
 148          pc = &c->FragmentProgram;
 149          break;
 150       case PIPE_SHADER_VERTEX:
 151          pc = &c->VertexProgram;
 152          break;
 153       case PIPE_SHADER_GEOMETRY:
 154          pc = &c->GeometryProgram;
 155          break;
 156       default:
 157          assert(0);
 158          continue;
 159       }
 160
 161       pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
 162       pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
 163       pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
 164       pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
 165       pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
 166       pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
 167       pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);
 168       pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);
 169       pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
 170
 171       options->EmitNoNoise = TRUE;
 172
 173       /* TODO: make these more fine-grained if anyone needs it */
 174       options->EmitNoIfs = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 175       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 176       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 177       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 178
 179       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 180
 181       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
 182                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 183       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
 184                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 185       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
 186                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 187       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
 188                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 189
 190       if(options->EmitNoLoops)
 191          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
 192    }
 193
 194    /* PIPE_CAP_MAX_FS_INPUTS specifies the number of COLORn + GENERICn inputs
 195     * and is set in MaxNativeAttribs. It's always 2 colors + N generic
 196     * attributes. The GLSL compiler never uses COLORn for varyings, so we
 197     * subtract the 2 colors to get the maximum number of varyings (generic
 198     * attributes) supported by a driver. */
 199    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_MAX_INPUTS) - 2;
 200    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 201
 202    /* XXX we'll need a better query here someday */
 203    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
 204       c->GLSLVersion = 120;
 205    }
 206 }
 207
 208
 209 /**
 210  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
 211  * which GL extensions are supported.
 212  * Quite a few extensions are always supported because they are standard
 213  * features or can be built on top of other gallium features.
 214  * Some fine tuning may still be needed.
 215  */
 216 void st_init_extensions(struct st_context *st)
 217 {
 218    struct pipe_screen *screen = st->pipe->screen;
 219    struct gl_context *ctx = st->ctx;
 220
 221    /*
 222     * Extensions that are supported by all Gallium drivers:
 223     */
 224    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 225    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 226    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
 227    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 228    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 229    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 230    ctx->Extensions.ARB_multisample = GL_TRUE;
 231    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
 232    ctx->Extensions.ARB_texture_compression = GL_TRUE;
 233    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 234    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 235    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 236    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 237    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 238    ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
 239    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 240    ctx->Extensions.ARB_window_pos = GL_TRUE;
 241
 242    ctx->Extensions.EXT_blend_color = GL_TRUE;
 243    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 244    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 245    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 246    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 247    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 248    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 249    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 250    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 251    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 252    ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
 253    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 254    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 255    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 256    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 257    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 258    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 259    ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
 260    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 261    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 262    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 263    if (ctx->API == API_OPENGLES || ctx->API == API_OPENGLES2)
 264            ctx->Extensions.EXT_texture_format_BGRA8888 = GL_TRUE;
 265
 266    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 267
 268    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 269
 270    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 271
 272    ctx->Extensions.NV_blend_square = GL_TRUE;
 273    ctx->Extensions.NV_texgen_reflection = GL_TRUE;
 274    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 275    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 276 #if 0
 277    /* possibly could support the following two */
 278    ctx->Extensions.NV_vertex_program = GL_TRUE;
 279    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 280 #endif
 281
 282 #if FEATURE_OES_EGL_image
 283    ctx->Extensions.OES_EGL_image = GL_TRUE;
 284 #endif
 285 #if FEATURE_OES_draw_texture
 286    ctx->Extensions.OES_draw_texture = GL_TRUE;
 287 #endif
 288
 289    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 290
 291    /*
 292     * Extensions that depend on the driver/hardware:
 293     */
 294    if (screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS) > 0) {
 295       ctx->Extensions.ARB_draw_buffers = GL_TRUE;
 296    }
 297
 298    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SWIZZLE) > 0) {
 299       ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 300    }
 301
 302    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
 303       ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 304       ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 305       ctx->Extensions.ARB_shader_objects = GL_TRUE;
 306       ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 307       ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
 308       ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
 309    }
 310
 311    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_REPEAT) > 0) {
 312       ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 313    }
 314
 315    if (screen->get_param(screen, PIPE_CAP_BLEND_EQUATION_SEPARATE)) {
 316       ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 317    }
 318
 319    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_CLAMP) > 0) {
 320       ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 321       ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 322    }
 323
 324    if (screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES)) {
 325       ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 326    }
 327
 328    if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS) > 1) {
 329       ctx->Extensions.ARB_multitexture = GL_TRUE;
 330    }
 331
 332    if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {
 333       ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 334       ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 335    }
 336
 337    if (screen->get_param(screen, PIPE_CAP_ANISOTROPIC_FILTER)) {
 338       ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
 339    }
 340
 341    if (screen->get_param(screen, PIPE_CAP_POINT_SPRITE)) {
 342       ctx->Extensions.ARB_point_sprite = GL_TRUE;
 343       /* GL_NV_point_sprite is not supported by gallium because we don't
 344        * support the GL_POINT_SPRITE_R_MODE_NV option.
 345        */
 346    }
 347
 348    if (screen->get_param(screen, PIPE_CAP_OCCLUSION_QUERY)) {
 349       ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 350       ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
 351    }
 352    if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY)) {
 353      ctx->Extensions.EXT_timer_query = GL_TRUE;
 354    }
 355
 356    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SHADOW_MAP)) {
 357       ctx->Extensions.ARB_depth_texture = GL_TRUE;
 358       ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 359       ctx->Extensions.ARB_shadow = GL_TRUE;
 360       ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 361       /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/
 362    }
 363
 364    /* GL_EXT_packed_depth_stencil requires both the ability to render to
 365     * a depth/stencil buffer and texture from depth/stencil source.
 366     */
 367    if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 368                                    PIPE_TEXTURE_2D, 0,
 369                                    PIPE_BIND_DEPTH_STENCIL, 0) &&
 370        screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 371                                    PIPE_TEXTURE_2D, 0,
 372                                    PIPE_BIND_SAMPLER_VIEW, 0)) {
 373       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 374    }
 375    else if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 376                                         PIPE_TEXTURE_2D, 0,
 377                                         PIPE_BIND_DEPTH_STENCIL, 0) &&
 378             screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 379                                         PIPE_TEXTURE_2D, 0,
 380                                         PIPE_BIND_SAMPLER_VIEW, 0)) {
 381       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 382    }
 383
 384    /* sRGB support */
 385    if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 386                                    PIPE_TEXTURE_2D, 0,
 387                                    PIPE_BIND_SAMPLER_VIEW, 0) ||
 388       screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 389                                    PIPE_TEXTURE_2D, 0,
 390                                    PIPE_BIND_SAMPLER_VIEW, 0)) {
 391       ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 392       ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
 393       if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 394                                    PIPE_TEXTURE_2D, 0,
 395                                    PIPE_BIND_RENDER_TARGET, 0) ||
 396           screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 397                                    PIPE_TEXTURE_2D, 0,
 398                                    PIPE_BIND_RENDER_TARGET, 0)) {
 399          ctx->Extensions.EXT_framebuffer_sRGB = GL_TRUE;
 400          ctx->Const.sRGBCapable = GL_TRUE;
 401       }
 402    }
 403
 404    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM,
 405                                    PIPE_TEXTURE_2D, 0,
 406                                    PIPE_BIND_SAMPLER_VIEW, 0)) {
 407       ctx->Extensions.ARB_texture_rg = GL_TRUE;
 408    }
 409
 410    /* s3tc support */
 411    if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 412                                    PIPE_TEXTURE_2D, 0,
 413                                    PIPE_BIND_SAMPLER_VIEW, 0) &&
 414        ctx->Mesa_DXTn) {
 415       ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
 416       ctx->Extensions.S3_s3tc = GL_TRUE;
 417    }
 418
 419    /* ycbcr support */
 420    if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 421                                    PIPE_TEXTURE_2D, 0,
 422                                    PIPE_BIND_SAMPLER_VIEW, 0) ||
 423        screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 424                                    PIPE_TEXTURE_2D, 0,
 425                                    PIPE_BIND_SAMPLER_VIEW, 0)) {
 426       ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 427    }
 428
 429    /* GL_EXT_texture_array */
 430    if (screen->get_param(screen, PIPE_CAP_ARRAY_TEXTURES)) {
 431       ctx->Extensions.EXT_texture_array = GL_TRUE;
 432       ctx->Extensions.MESA_texture_array = GL_TRUE;
 433    }
 434
 435    /* GL_ARB_framebuffer_object */
 436    if (ctx->Extensions.EXT_packed_depth_stencil) {
 437       /* we support always support GL_EXT_framebuffer_blit */
 438       ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 439    }
 440
 441    if (st->pipe->render_condition) {
 442       ctx->Extensions.NV_conditional_render = GL_TRUE;
 443    }
 444
 445    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_ENABLE)) {
 446       ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
 447    }
 448
 449    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC)) {
 450       ctx->Extensions.ARB_draw_buffers_blend = GL_TRUE;
 451    }
 452
 453    /* GL_ARB_half_float_vertex */
 454    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 455                                    PIPE_BUFFER, 0,
 456                                    PIPE_BIND_VERTEX_BUFFER, 0)) {
 457       ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
 458    }
 459
 460    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY, PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
 461 #if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
 462       ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
 463 #endif
 464    }
 465
 466    if (screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
 467       ctx->Extensions.NV_primitive_restart = GL_TRUE;
 468    }
 469
 470    if (screen->get_param(screen, PIPE_CAP_DEPTH_CLAMP)) {
 471       ctx->Extensions.ARB_depth_clamp = GL_TRUE;
 472    }
 473
 474    if (screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {
 475       ctx->Extensions.ARB_shader_stencil_export = GL_TRUE;
 476    }
 477
 478    if (screen->get_param(screen, PIPE_CAP_INSTANCED_DRAWING)) {
 479       ctx->Extensions.ARB_draw_instanced = GL_TRUE;
 480       ctx->Extensions.ARB_instanced_arrays = GL_TRUE;
 481    }
 482 }