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 #include "main/version.h"
  34
  35 #include "pipe/p_context.h"
  36 #include "pipe/p_defines.h"
  37 #include "pipe/p_screen.h"
  38
  39 #include "st_context.h"
  40 #include "st_extensions.h"
  41
  42
  43 static int _min(int a, int b)
  44 {
  45    return (a < b) ? a : b;
  46 }
  47
  48 static float _maxf(float a, float b)
  49 {
  50    return (a > b) ? a : b;
  51 }
  52
  53 static int _clamp(int a, int min, int max)
  54 {
  55    if (a < min)
  56       return min;
  57    else if (a > max)
  58       return max;
  59    else
  60       return a;
  61 }
  62
  63
  64 /**
  65  * Query driver to get implementation limits.
  66  * Note that we have to limit/clamp against Mesa's internal limits too.
  67  */
  68 void st_init_limits(struct st_context *st)
  69 {
  70    struct pipe_screen *screen = st->pipe->screen;
  71    struct gl_constants *c = &st->ctx->Const;
  72    gl_shader_type sh;
  73
  74    c->MaxTextureLevels
  75       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),
  76             MAX_TEXTURE_LEVELS);
  77
  78    c->Max3DTextureLevels
  79       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_3D_LEVELS),
  80             MAX_3D_TEXTURE_LEVELS);
  81
  82    c->MaxCubeTextureLevels
  83       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS),
  84             MAX_CUBE_TEXTURE_LEVELS);
  85
  86    c->MaxTextureRectSize
  87       = _min(1 << (c->MaxTextureLevels - 1), MAX_TEXTURE_RECT_SIZE);
  88
  89    c->MaxArrayTextureLayers
  90       = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS);
  91
  92    c->MaxTextureImageUnits
  93       = _min(screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
  94                                       PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS),
  95             MAX_TEXTURE_IMAGE_UNITS);
  96
  97    c->MaxVertexTextureImageUnits
  98       = _min(screen->get_shader_param(screen, PIPE_SHADER_VERTEX,
  99                                       PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS),
 100              MAX_VERTEX_TEXTURE_IMAGE_UNITS);
 101
 102    c->MaxCombinedTextureImageUnits
 103       = _min(screen->get_param(screen, PIPE_CAP_MAX_COMBINED_SAMPLERS),
 104              MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 105
 106    c->MaxTextureCoordUnits
 107       = _min(c->MaxTextureImageUnits, MAX_TEXTURE_COORD_UNITS);
 108
 109    c->MaxTextureUnits = _min(c->MaxTextureImageUnits, c->MaxTextureCoordUnits);
 110
 111    c->MaxDrawBuffers
 112       = _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 113               1, MAX_DRAW_BUFFERS);
 114
 115    c->MaxLineWidth
 116       = _maxf(1.0f, screen->get_paramf(screen,
 117                                        PIPE_CAPF_MAX_LINE_WIDTH));
 118    c->MaxLineWidthAA
 119       = _maxf(1.0f, screen->get_paramf(screen,
 120                                        PIPE_CAPF_MAX_LINE_WIDTH_AA));
 121
 122    c->MaxPointSize
 123       = _maxf(1.0f, screen->get_paramf(screen,
 124                                        PIPE_CAPF_MAX_POINT_WIDTH));
 125    c->MaxPointSizeAA
 126       = _maxf(1.0f, screen->get_paramf(screen,
 127                                        PIPE_CAPF_MAX_POINT_WIDTH_AA));
 128    /* called after _mesa_create_context/_mesa_init_point, fix default user
 129     * settable max point size up
 130     */
 131    st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);
 132    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
 133     * for non-aa sizes, but we can go down to 0.0 for aa points.
 134     */
 135    c->MinPointSize = 1.0f;
 136    c->MinPointSizeAA = 0.0f;
 137
 138    c->MaxTextureMaxAnisotropy
 139       = _maxf(2.0f, screen->get_paramf(screen,
 140                                  PIPE_CAPF_MAX_TEXTURE_ANISOTROPY));
 141
 142    c->MaxTextureLodBias
 143       = screen->get_paramf(screen, PIPE_CAPF_MAX_TEXTURE_LOD_BIAS);
 144
 145    c->MaxDrawBuffers
 146       = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 147               1, MAX_DRAW_BUFFERS);
 148
 149    /* Quads always follow GL provoking rules. */
 150    c->QuadsFollowProvokingVertexConvention = GL_FALSE;
 151
 152    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh) {
 153       struct gl_shader_compiler_options *options =
 154          &st->ctx->ShaderCompilerOptions[sh];
 155       struct gl_program_constants *pc;
 156
 157       switch (sh) {
 158       case PIPE_SHADER_FRAGMENT:
 159          pc = &c->FragmentProgram;
 160          break;
 161       case PIPE_SHADER_VERTEX:
 162          pc = &c->VertexProgram;
 163          break;
 164       case PIPE_SHADER_GEOMETRY:
 165          pc = &c->GeometryProgram;
 166          break;
 167       default:
 168          assert(0);
 169          continue;
 170       }
 171
 172       pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
 173       pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
 174       pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
 175       pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
 176       pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
 177       pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
 178       pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);
 179       pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);
 180       pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
 181       /* raise MaxParameters if native support is higher */
 182       pc->MaxParameters            = MAX2(pc->MaxParameters, pc->MaxNativeParameters);
 183
 184       /* Gallium doesn't really care about local vs. env parameters so use the
 185        * same limits.
 186        */
 187       pc->MaxLocalParams = MIN2(pc->MaxParameters, MAX_PROGRAM_LOCAL_PARAMS);
 188       pc->MaxEnvParams = MIN2(pc->MaxParameters, MAX_PROGRAM_ENV_PARAMS);
 189
 190       options->EmitNoNoise = TRUE;
 191
 192       /* TODO: make these more fine-grained if anyone needs it */
 193       options->MaxIfDepth = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 194       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 195       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 196       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 197
 198       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 199
 200       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
 201                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 202       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
 203                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 204       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
 205                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 206       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
 207                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 208
 209       if (options->EmitNoLoops)
 210          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
 211    }
 212
 213    /* PIPE_SHADER_CAP_MAX_INPUTS for the FS specifies the maximum number
 214     * of inputs. It's always 2 colors + N generic inputs. */
 215    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 216                                             PIPE_SHADER_CAP_MAX_INPUTS);
 217    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 218
 219    c->MinProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
 220    c->MaxProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
 221
 222    c->UniformBooleanTrue = ~0;
 223
 224    c->StripTextureBorder = GL_TRUE;
 225 }
 226
 227
 228 static GLboolean st_get_s3tc_override(void)
 229 {
 230    const char *override = _mesa_getenv("force_s3tc_enable");
 231    if (override && !strcmp(override, "true"))
 232       return GL_TRUE;
 233    return GL_FALSE;
 234 }
 235
 236
 237 /**
 238  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
 239  * which GL extensions are supported.
 240  * Quite a few extensions are always supported because they are standard
 241  * features or can be built on top of other gallium features.
 242  * Some fine tuning may still be needed.
 243  */
 244 void st_init_extensions(struct st_context *st)
 245 {
 246    struct pipe_screen *screen = st->pipe->screen;
 247    struct gl_context *ctx = st->ctx;
 248    int i;
 249
 250    ctx->Const.GLSLVersion = 120;
 251    _mesa_override_glsl_version(st->ctx);
 252
 253    /*
 254     * Extensions that are supported by all Gallium drivers:
 255     */
 256    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 257    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 258    ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
 259    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
 260    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 261    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 262    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 263    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 264    ctx->Extensions.ARB_sampler_objects = GL_TRUE;
 265    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 266    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 267    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
 268    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 269    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 270    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 271    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 272    ctx->Extensions.ARB_texture_storage = GL_TRUE;
 273    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 274    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 275    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 276    ctx->Extensions.ARB_window_pos = GL_TRUE;
 277
 278    ctx->Extensions.EXT_blend_color = GL_TRUE;
 279    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 280    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 281    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 282    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 283    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 284    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 285    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 286    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 287    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 288    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 289    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 290    ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
 291    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 292    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 293
 294    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 295
 296    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 297
 298    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 299
 300    ctx->Extensions.NV_blend_square = GL_TRUE;
 301    ctx->Extensions.NV_fog_distance = GL_TRUE;
 302    ctx->Extensions.NV_texgen_reflection = GL_TRUE;
 303    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 304    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 305 #if 0
 306    /* possibly could support the following two */
 307    ctx->Extensions.NV_vertex_program = GL_TRUE;
 308    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 309 #endif
 310
 311 #if FEATURE_OES_EGL_image
 312    ctx->Extensions.OES_EGL_image = GL_TRUE;
 313    if (ctx->API != API_OPENGL)
 314       ctx->Extensions.OES_EGL_image_external = GL_TRUE;
 315 #endif
 316 #if FEATURE_OES_draw_texture
 317    ctx->Extensions.OES_draw_texture = GL_TRUE;
 318 #endif
 319
 320    /*
 321     * Extensions that depend on the driver/hardware:
 322     */
 323    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SWIZZLE) > 0) {
 324       ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 325    }
 326
 327    if (screen->get_param(screen, PIPE_CAP_BLEND_EQUATION_SEPARATE)) {
 328       ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 329    }
 330
 331    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_CLAMP) > 0) {
 332       ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 333       ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 334    }
 335
 336    if (screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES)) {
 337       ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 338    }
 339
 340    if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {
 341       ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 342       ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 343    }
 344
 345    if (screen->get_param(screen, PIPE_CAP_ANISOTROPIC_FILTER)) {
 346       ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
 347    }
 348
 349    if (screen->get_param(screen, PIPE_CAP_POINT_SPRITE)) {
 350       ctx->Extensions.ARB_point_sprite = GL_TRUE;
 351       /* GL_NV_point_sprite is not supported by gallium because we don't
 352        * support the GL_POINT_SPRITE_R_MODE_NV option.
 353        */
 354    }
 355
 356    if (screen->get_param(screen, PIPE_CAP_OCCLUSION_QUERY)) {
 357       ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 358       ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
 359    }
 360    if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY)) {
 361       ctx->Extensions.EXT_timer_query = GL_TRUE;
 362    }
 363
 364    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SHADOW_MAP)) {
 365       ctx->Extensions.ARB_depth_texture = GL_TRUE;
 366       ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 367       ctx->Extensions.ARB_shadow = GL_TRUE;
 368       ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 369       /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/
 370    }
 371
 372    /* GL_EXT_packed_depth_stencil requires both the ability to render to
 373     * a depth/stencil buffer and texture from depth/stencil source.
 374     */
 375    if (screen->is_format_supported(screen, PIPE_FORMAT_S8_UINT_Z24_UNORM,
 376                                    PIPE_TEXTURE_2D, 0,
 377                                    PIPE_BIND_DEPTH_STENCIL) &&
 378        screen->is_format_supported(screen, PIPE_FORMAT_S8_UINT_Z24_UNORM,
 379                                    PIPE_TEXTURE_2D, 0,
 380                                    PIPE_BIND_SAMPLER_VIEW)) {
 381       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 382    }
 383    else if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_UINT,
 384                                         PIPE_TEXTURE_2D, 0,
 385                                         PIPE_BIND_DEPTH_STENCIL) &&
 386             screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_UINT,
 387                                         PIPE_TEXTURE_2D, 0,
 388                                         PIPE_BIND_SAMPLER_VIEW)) {
 389       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 390    }
 391
 392    /* float support - assume nothing exclusively supports 64-bit floats */
 393    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 394                                    PIPE_TEXTURE_2D, 0,
 395                                    PIPE_BIND_SAMPLER_VIEW |
 396                                    PIPE_BIND_RENDER_TARGET) &&
 397       screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 398                                    PIPE_TEXTURE_2D, 0,
 399                                    PIPE_BIND_SAMPLER_VIEW |
 400                                    PIPE_BIND_RENDER_TARGET)) {
 401       ctx->Extensions.ARB_texture_float = GL_TRUE;
 402    }
 403
 404    /* sRGB support */
 405    if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 406                                    PIPE_TEXTURE_2D, 0,
 407                                    PIPE_BIND_SAMPLER_VIEW) ||
 408       screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 409                                    PIPE_TEXTURE_2D, 0,
 410                                    PIPE_BIND_SAMPLER_VIEW)) {
 411       ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 412       ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
 413       if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 414                                    PIPE_TEXTURE_2D, 0,
 415                                    PIPE_BIND_RENDER_TARGET) ||
 416           screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 417                                    PIPE_TEXTURE_2D, 0,
 418                                    PIPE_BIND_RENDER_TARGET)) {
 419          ctx->Extensions.EXT_framebuffer_sRGB = GL_TRUE;
 420          ctx->Const.sRGBCapable = GL_TRUE;
 421       }
 422    }
 423
 424    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM,
 425                                    PIPE_TEXTURE_2D, 0,
 426                                    PIPE_BIND_SAMPLER_VIEW)) {
 427       ctx->Extensions.ARB_texture_rg = GL_TRUE;
 428    }
 429
 430    /* s3tc support */
 431    if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 432                                    PIPE_TEXTURE_2D, 0,
 433                                    PIPE_BIND_SAMPLER_VIEW) &&
 434        (ctx->Mesa_DXTn || st_get_s3tc_override())) {
 435       ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
 436       ctx->Extensions.S3_s3tc = GL_TRUE;
 437    }
 438
 439    if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM,
 440                                    PIPE_TEXTURE_2D, 0,
 441                                    PIPE_BIND_SAMPLER_VIEW) &&
 442        screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM,
 443                                    PIPE_TEXTURE_2D, 0,
 444                                    PIPE_BIND_SAMPLER_VIEW) &&
 445        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM,
 446                                    PIPE_TEXTURE_2D, 0,
 447                                    PIPE_BIND_SAMPLER_VIEW) &&
 448        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM,
 449                                    PIPE_TEXTURE_2D, 0,
 450                                    PIPE_BIND_SAMPLER_VIEW)
 451        ) {
 452      ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
 453    }
 454
 455    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_UNORM,
 456                                    PIPE_TEXTURE_2D, 0,
 457                                    PIPE_BIND_SAMPLER_VIEW) &&
 458        screen->is_format_supported(screen, PIPE_FORMAT_LATC1_SNORM,
 459                                    PIPE_TEXTURE_2D, 0,
 460                                    PIPE_BIND_SAMPLER_VIEW) &&
 461        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 462                                    PIPE_TEXTURE_2D, 0,
 463                                    PIPE_BIND_SAMPLER_VIEW) &&
 464        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_SNORM,
 465                                    PIPE_TEXTURE_2D, 0,
 466                                    PIPE_BIND_SAMPLER_VIEW)) {
 467       ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
 468    }
 469
 470    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 471                                    PIPE_TEXTURE_2D, 0,
 472                                    PIPE_BIND_SAMPLER_VIEW)) {
 473       ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
 474    }
 475
 476    if (ctx->API != API_OPENGL) {
 477       if (screen->is_format_supported(screen, PIPE_FORMAT_ETC1_RGB8,
 478                                       PIPE_TEXTURE_2D, 0,
 479                                       PIPE_BIND_SAMPLER_VIEW)) {
 480          ctx->Extensions.OES_compressed_ETC1_RGB8_texture = GL_TRUE;
 481       }
 482    }
 483
 484    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 485                                    PIPE_TEXTURE_2D, 0,
 486                                    PIPE_BIND_SAMPLER_VIEW)) {
 487       ctx->Extensions.EXT_texture_snorm = GL_TRUE;
 488    }
 489
 490    /* ycbcr support */
 491    if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 492                                    PIPE_TEXTURE_2D, 0,
 493                                    PIPE_BIND_SAMPLER_VIEW) ||
 494        screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 495                                    PIPE_TEXTURE_2D, 0,
 496                                    PIPE_BIND_SAMPLER_VIEW)) {
 497       ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 498    }
 499
 500    /* GL_EXT_texture_array */
 501    if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS) > 1) {
 502       ctx->Extensions.EXT_texture_array = GL_TRUE;
 503       ctx->Extensions.MESA_texture_array = GL_TRUE;
 504    }
 505
 506    /* GL_ARB_framebuffer_object */
 507    if (ctx->Extensions.EXT_packed_depth_stencil) {
 508       /* we support always support GL_EXT_framebuffer_blit */
 509       ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 510    }
 511
 512    if (screen->get_param(screen, PIPE_CAP_CONDITIONAL_RENDER)) {
 513       ctx->Extensions.NV_conditional_render = GL_TRUE;
 514    }
 515
 516    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_ENABLE)) {
 517       ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
 518    }
 519
 520    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC)) {
 521       ctx->Extensions.ARB_draw_buffers_blend = GL_TRUE;
 522    }
 523
 524    /* GL_ARB_half_float_vertex */
 525    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 526                                    PIPE_BUFFER, 0,
 527                                    PIPE_BIND_VERTEX_BUFFER)) {
 528       ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
 529    }
 530
 531    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FIXED,
 532                                    PIPE_BUFFER, 0,
 533                                    PIPE_BIND_VERTEX_BUFFER)) {
 534       ctx->Extensions.ARB_ES2_compatibility = GL_TRUE;
 535    }
 536
 537    if (screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_UNORM,
 538                                    PIPE_BUFFER, 0,
 539                                    PIPE_BIND_VERTEX_BUFFER) &&
 540        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_UNORM,
 541                                    PIPE_BUFFER, 0,
 542                                    PIPE_BIND_VERTEX_BUFFER) &&
 543        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SNORM,
 544                                    PIPE_BUFFER, 0,
 545                                    PIPE_BIND_VERTEX_BUFFER) &&
 546        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SNORM,
 547                                    PIPE_BUFFER, 0,
 548                                    PIPE_BIND_VERTEX_BUFFER) &&
 549        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_USCALED,
 550                                    PIPE_BUFFER, 0,
 551                                    PIPE_BIND_VERTEX_BUFFER) &&
 552        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_USCALED,
 553                                    PIPE_BUFFER, 0,
 554                                    PIPE_BIND_VERTEX_BUFFER) &&
 555        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SSCALED,
 556                                    PIPE_BUFFER, 0,
 557                                    PIPE_BIND_VERTEX_BUFFER) &&
 558        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SSCALED,
 559                                    PIPE_BUFFER, 0,
 560                                    PIPE_BIND_VERTEX_BUFFER)) {
 561       ctx->Extensions.ARB_vertex_type_2_10_10_10_rev = GL_TRUE;
 562    }
 563
 564    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY,
 565                                 PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
 566 #if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
 567       ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
 568 #endif
 569    }
 570
 571    ctx->Extensions.NV_primitive_restart = GL_TRUE;
 572    if (!screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
 573       st->sw_primitive_restart = GL_TRUE;
 574    }
 575
 576    if (screen->get_param(screen, PIPE_CAP_DEPTH_CLAMP)) {
 577       ctx->Extensions.ARB_depth_clamp = GL_TRUE;
 578    }
 579
 580    /* This extension does not actually require support of floating point
 581     * render targets, just clamping controls.
 582     * Advertise this extension if either fragment color clamping is supported
 583     * or no render targets having color values outside of the range [0, 1]
 584     * are supported, in which case the fragment color clamping has no effect
 585     * on rendering.
 586     */
 587    if (screen->get_param(screen, PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL) ||
 588        (!screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 589                                      PIPE_TEXTURE_2D, 0,
 590                                      PIPE_BIND_RENDER_TARGET) &&
 591         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM,
 592                                      PIPE_TEXTURE_2D, 0,
 593                                      PIPE_BIND_RENDER_TARGET) &&
 594         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 595                                      PIPE_TEXTURE_2D, 0,
 596                                      PIPE_BIND_RENDER_TARGET) &&
 597         !screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 598                                      PIPE_TEXTURE_2D, 0,
 599                                      PIPE_BIND_RENDER_TARGET) &&
 600         !screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 601                                      PIPE_TEXTURE_2D, 0,
 602                                      PIPE_BIND_RENDER_TARGET) &&
 603         !screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 604                                      PIPE_TEXTURE_2D, 0,
 605                                      PIPE_BIND_RENDER_TARGET))) {
 606       ctx->Extensions.ARB_color_buffer_float = GL_TRUE;
 607    }
 608
 609    if (screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {
 610       ctx->Extensions.ARB_shader_stencil_export = GL_TRUE;
 611    }
 612
 613    if (screen->get_param(screen, PIPE_CAP_TGSI_INSTANCEID)) {
 614       ctx->Extensions.ARB_draw_instanced = GL_TRUE;
 615    }
 616    if (screen->get_param(screen, PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR)) {
 617       ctx->Extensions.ARB_instanced_arrays = GL_TRUE;
 618    }
 619
 620    if (screen->fence_finish) {
 621       ctx->Extensions.ARB_sync = GL_TRUE;
 622    }
 623
 624    if (screen->get_param(screen, PIPE_CAP_TEXTURE_BARRIER)) {
 625       ctx->Extensions.NV_texture_barrier = GL_TRUE;
 626    }
 627
 628    if (screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 629                                    PIPE_TEXTURE_2D, 0,
 630                                    PIPE_BIND_SAMPLER_VIEW)) {
 631       ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
 632    }
 633
 634    if (screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 635                                    PIPE_TEXTURE_2D, 0,
 636                                    PIPE_BIND_RENDER_TARGET |
 637                                    PIPE_BIND_SAMPLER_VIEW)) {
 638       ctx->Extensions.EXT_packed_float = GL_TRUE;
 639    }
 640
 641    /* Maximum sample count. */
 642    for (i = 16; i > 0; --i) {
 643       if (screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_UNORM,
 644                                       PIPE_TEXTURE_2D, i,
 645                                       PIPE_BIND_RENDER_TARGET)) {
 646          ctx->Const.MaxSamples = i;
 647          break;
 648       }
 649    }
 650
 651    if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE)) {
 652       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 653       ctx->Extensions.AMD_seamless_cubemap_per_texture = GL_TRUE;
 654    }
 655    else if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP)) {
 656       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 657    }
 658
 659    if (screen->get_param(screen, PIPE_CAP_SM3)) {
 660       ctx->Extensions.ARB_shader_texture_lod = GL_TRUE;
 661    }
 662
 663    if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT,
 664                                    PIPE_TEXTURE_2D, 0,
 665                                    PIPE_BIND_DEPTH_STENCIL |
 666                                    PIPE_BIND_SAMPLER_VIEW) &&
 667        screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT_S8X24_UINT,
 668                                    PIPE_TEXTURE_2D, 0,
 669                                    PIPE_BIND_DEPTH_STENCIL |
 670                                    PIPE_BIND_SAMPLER_VIEW)) {
 671       ctx->Extensions.ARB_depth_buffer_float = GL_TRUE;
 672    }
 673
 674    if (screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_UINT,
 675                                    PIPE_TEXTURE_2D, 0,
 676                                    PIPE_BIND_SAMPLER_VIEW))
 677        ctx->Extensions.ARB_texture_rgb10_a2ui = GL_TRUE;
 678
 679 }