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       /* raise MaxParameters if native support is higher */
 171       pc->MaxParameters            = MAX2(pc->MaxParameters, pc->MaxNativeParameters);
 172
 173       options->EmitNoNoise = TRUE;
 174
 175       /* TODO: make these more fine-grained if anyone needs it */
 176       options->MaxIfDepth = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 177       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 178       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 179       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 180
 181       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 182
 183       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
 184                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 185       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
 186                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 187       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
 188                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 189       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
 190                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 191
 192       if (options->EmitNoLoops)
 193          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
 194    }
 195
 196    /* PIPE_CAP_MAX_FS_INPUTS specifies the number of COLORn + GENERICn inputs
 197     * and is set in MaxNativeAttribs. It's always 2 colors + N generic
 198     * attributes. The GLSL compiler never uses COLORn for varyings, so we
 199     * subtract the 2 colors to get the maximum number of varyings (generic
 200     * attributes) supported by a driver. */
 201    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_MAX_INPUTS) - 2;
 202    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 203
 204    /* XXX we'll need a better query here someday */
 205    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
 206       c->MinProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
 207       c->MaxProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
 208
 209       c->GLSLVersion = 120;
 210       c->UniformBooleanTrue = ~0;
 211    }
 212 }
 213
 214
 215 static GLboolean st_get_s3tc_override(void)
 216 {
 217    const char *override = _mesa_getenv("force_s3tc_enable");
 218    if (override && !strcmp(override, "true"))
 219       return GL_TRUE;
 220    return GL_FALSE;
 221 }
 222
 223
 224 /**
 225  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
 226  * which GL extensions are supported.
 227  * Quite a few extensions are always supported because they are standard
 228  * features or can be built on top of other gallium features.
 229  * Some fine tuning may still be needed.
 230  */
 231 void st_init_extensions(struct st_context *st)
 232 {
 233    struct pipe_screen *screen = st->pipe->screen;
 234    struct gl_context *ctx = st->ctx;
 235    int i;
 236
 237    /*
 238     * Extensions that are supported by all Gallium drivers:
 239     */
 240    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 241    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 242    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
 243    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 244    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 245    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 246    ctx->Extensions.ARB_multisample = GL_TRUE;
 247    ctx->Extensions.ARB_sampler_objects = GL_TRUE;
 248    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
 249    ctx->Extensions.ARB_texture_compression = GL_TRUE;
 250    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 251    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 252    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 253    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 254    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 255    ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
 256    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 257    ctx->Extensions.ARB_window_pos = GL_TRUE;
 258
 259    ctx->Extensions.EXT_blend_color = GL_TRUE;
 260    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 261    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 262    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 263    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 264    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 265    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 266    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 267    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 268    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 269    ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
 270    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 271    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 272    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 273    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 274    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 275    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 276    ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
 277    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 278    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 279    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 280    if (ctx->API == API_OPENGLES || ctx->API == API_OPENGLES2)
 281            ctx->Extensions.EXT_texture_format_BGRA8888 = GL_TRUE;
 282
 283    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 284
 285    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 286
 287    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 288
 289    ctx->Extensions.NV_blend_square = GL_TRUE;
 290    ctx->Extensions.NV_texgen_reflection = GL_TRUE;
 291    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 292    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 293 #if 0
 294    /* possibly could support the following two */
 295    ctx->Extensions.NV_vertex_program = GL_TRUE;
 296    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 297 #endif
 298
 299 #if FEATURE_OES_EGL_image
 300    ctx->Extensions.OES_EGL_image = GL_TRUE;
 301 #endif
 302 #if FEATURE_OES_draw_texture
 303    ctx->Extensions.OES_draw_texture = GL_TRUE;
 304 #endif
 305
 306    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 307
 308    /*
 309     * Extensions that depend on the driver/hardware:
 310     */
 311    if (screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS) > 0) {
 312       ctx->Extensions.ARB_draw_buffers = GL_TRUE;
 313    }
 314
 315    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SWIZZLE) > 0) {
 316       ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 317    }
 318
 319    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
 320       ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 321       ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 322       ctx->Extensions.ARB_shader_objects = GL_TRUE;
 323       ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 324       ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
 325       ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
 326    }
 327
 328    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_REPEAT) > 0) {
 329       ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 330    }
 331
 332    if (screen->get_param(screen, PIPE_CAP_BLEND_EQUATION_SEPARATE)) {
 333       ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 334    }
 335
 336    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_CLAMP) > 0) {
 337       ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 338       ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 339    }
 340
 341    if (screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES)) {
 342       ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 343    }
 344
 345    if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS) > 1) {
 346       ctx->Extensions.ARB_multitexture = GL_TRUE;
 347    }
 348
 349    if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {
 350       ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 351       ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 352    }
 353
 354    if (screen->get_param(screen, PIPE_CAP_ANISOTROPIC_FILTER)) {
 355       ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
 356    }
 357
 358    if (screen->get_param(screen, PIPE_CAP_POINT_SPRITE)) {
 359       ctx->Extensions.ARB_point_sprite = GL_TRUE;
 360       /* GL_NV_point_sprite is not supported by gallium because we don't
 361        * support the GL_POINT_SPRITE_R_MODE_NV option.
 362        */
 363    }
 364
 365    if (screen->get_param(screen, PIPE_CAP_OCCLUSION_QUERY)) {
 366       ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 367       ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
 368    }
 369    if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY)) {
 370      ctx->Extensions.EXT_timer_query = GL_TRUE;
 371    }
 372
 373    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SHADOW_MAP)) {
 374       ctx->Extensions.ARB_depth_texture = GL_TRUE;
 375       ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 376       ctx->Extensions.ARB_shadow = GL_TRUE;
 377       ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 378       /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/
 379    }
 380
 381    /* GL_EXT_packed_depth_stencil requires both the ability to render to
 382     * a depth/stencil buffer and texture from depth/stencil source.
 383     */
 384    if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 385                                    PIPE_TEXTURE_2D, 0,
 386                                    PIPE_BIND_DEPTH_STENCIL) &&
 387        screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 388                                    PIPE_TEXTURE_2D, 0,
 389                                    PIPE_BIND_SAMPLER_VIEW)) {
 390       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 391    }
 392    else if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 393                                         PIPE_TEXTURE_2D, 0,
 394                                         PIPE_BIND_DEPTH_STENCIL) &&
 395             screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 396                                         PIPE_TEXTURE_2D, 0,
 397                                         PIPE_BIND_SAMPLER_VIEW)) {
 398       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 399    }
 400
 401    /* float support - assume nothing exclusively supports 64-bit floats */
 402    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 403                                    PIPE_TEXTURE_2D, 0,
 404                                    PIPE_BIND_SAMPLER_VIEW |
 405                                    PIPE_BIND_RENDER_TARGET) &&
 406       screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 407                                    PIPE_TEXTURE_2D, 0,
 408                                    PIPE_BIND_SAMPLER_VIEW |
 409                                    PIPE_BIND_RENDER_TARGET)) {
 410       ctx->Extensions.ARB_texture_float = GL_TRUE;
 411    }
 412
 413    /* sRGB support */
 414    if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 415                                    PIPE_TEXTURE_2D, 0,
 416                                    PIPE_BIND_SAMPLER_VIEW) ||
 417       screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 418                                    PIPE_TEXTURE_2D, 0,
 419                                    PIPE_BIND_SAMPLER_VIEW)) {
 420       ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 421       ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
 422       if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 423                                    PIPE_TEXTURE_2D, 0,
 424                                    PIPE_BIND_RENDER_TARGET) ||
 425           screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 426                                    PIPE_TEXTURE_2D, 0,
 427                                    PIPE_BIND_RENDER_TARGET)) {
 428          ctx->Extensions.EXT_framebuffer_sRGB = GL_TRUE;
 429          ctx->Const.sRGBCapable = GL_TRUE;
 430       }
 431    }
 432
 433    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM,
 434                                    PIPE_TEXTURE_2D, 0,
 435                                    PIPE_BIND_SAMPLER_VIEW)) {
 436       ctx->Extensions.ARB_texture_rg = GL_TRUE;
 437    }
 438
 439    /* s3tc support */
 440    if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 441                                    PIPE_TEXTURE_2D, 0,
 442                                    PIPE_BIND_SAMPLER_VIEW) &&
 443        (ctx->Mesa_DXTn || st_get_s3tc_override())) {
 444       ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
 445       ctx->Extensions.S3_s3tc = GL_TRUE;
 446    }
 447
 448    if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM,
 449                                    PIPE_TEXTURE_2D, 0,
 450                                    PIPE_BIND_SAMPLER_VIEW) &&
 451        screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM,
 452                                    PIPE_TEXTURE_2D, 0,
 453                                    PIPE_BIND_SAMPLER_VIEW) &&
 454        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM,
 455                                    PIPE_TEXTURE_2D, 0,
 456                                    PIPE_BIND_SAMPLER_VIEW) &&
 457        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM,
 458                                    PIPE_TEXTURE_2D, 0,
 459                                    PIPE_BIND_SAMPLER_VIEW)
 460        ) {
 461      ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
 462    }
 463
 464    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_UNORM,
 465                                    PIPE_TEXTURE_2D, 0,
 466                                    PIPE_BIND_SAMPLER_VIEW) &&
 467        screen->is_format_supported(screen, PIPE_FORMAT_LATC1_SNORM,
 468                                    PIPE_TEXTURE_2D, 0,
 469                                    PIPE_BIND_SAMPLER_VIEW) &&
 470        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 471                                    PIPE_TEXTURE_2D, 0,
 472                                    PIPE_BIND_SAMPLER_VIEW) &&
 473        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_SNORM,
 474                                    PIPE_TEXTURE_2D, 0,
 475                                    PIPE_BIND_SAMPLER_VIEW)) {
 476       ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
 477    }
 478
 479    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 480                                    PIPE_TEXTURE_2D, 0,
 481                                    PIPE_BIND_SAMPLER_VIEW)) {
 482       ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
 483    }
 484
 485    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 486                                    PIPE_TEXTURE_2D, 0,
 487                                    PIPE_BIND_SAMPLER_VIEW)) {
 488       ctx->Extensions.EXT_texture_snorm = GL_TRUE;
 489    }
 490
 491    /* ycbcr support */
 492    if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 493                                    PIPE_TEXTURE_2D, 0,
 494                                    PIPE_BIND_SAMPLER_VIEW) ||
 495        screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 496                                    PIPE_TEXTURE_2D, 0,
 497                                    PIPE_BIND_SAMPLER_VIEW)) {
 498       ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 499    }
 500
 501    /* GL_EXT_texture_array */
 502    if (screen->get_param(screen, PIPE_CAP_ARRAY_TEXTURES)) {
 503       ctx->Extensions.EXT_texture_array = GL_TRUE;
 504       ctx->Extensions.MESA_texture_array = GL_TRUE;
 505    }
 506
 507    /* GL_ARB_framebuffer_object */
 508    if (ctx->Extensions.EXT_packed_depth_stencil) {
 509       /* we support always support GL_EXT_framebuffer_blit */
 510       ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 511    }
 512
 513    if (st->pipe->render_condition) {
 514       ctx->Extensions.NV_conditional_render = GL_TRUE;
 515    }
 516
 517    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_ENABLE)) {
 518       ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
 519    }
 520
 521    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC)) {
 522       ctx->Extensions.ARB_draw_buffers_blend = GL_TRUE;
 523    }
 524
 525    /* GL_ARB_half_float_vertex */
 526    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 527                                    PIPE_BUFFER, 0,
 528                                    PIPE_BIND_VERTEX_BUFFER)) {
 529       ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
 530    }
 531
 532    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FIXED,
 533                                    PIPE_BUFFER, 0,
 534                                    PIPE_BIND_VERTEX_BUFFER)) {
 535       ctx->Extensions.ARB_ES2_compatibility = GL_TRUE;
 536    }
 537
 538    if (screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_UNORM,
 539                                    PIPE_BUFFER, 0,
 540                                    PIPE_BIND_VERTEX_BUFFER) &&
 541        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_UNORM,
 542                                    PIPE_BUFFER, 0,
 543                                    PIPE_BIND_VERTEX_BUFFER) &&
 544        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SNORM,
 545                                    PIPE_BUFFER, 0,
 546                                    PIPE_BIND_VERTEX_BUFFER) &&
 547        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SNORM,
 548                                    PIPE_BUFFER, 0,
 549                                    PIPE_BIND_VERTEX_BUFFER) &&
 550        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_USCALED,
 551                                    PIPE_BUFFER, 0,
 552                                    PIPE_BIND_VERTEX_BUFFER) &&
 553        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_USCALED,
 554                                    PIPE_BUFFER, 0,
 555                                    PIPE_BIND_VERTEX_BUFFER) &&
 556        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SSCALED,
 557                                    PIPE_BUFFER, 0,
 558                                    PIPE_BIND_VERTEX_BUFFER) &&
 559        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SSCALED,
 560                                    PIPE_BUFFER, 0,
 561                                    PIPE_BIND_VERTEX_BUFFER)) {
 562       ctx->Extensions.ARB_vertex_type_2_10_10_10_rev = GL_TRUE;
 563    }
 564
 565    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY, 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    if (screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
 572       ctx->Extensions.NV_primitive_restart = GL_TRUE;
 573    }
 574
 575    if (screen->get_param(screen, PIPE_CAP_DEPTH_CLAMP)) {
 576       ctx->Extensions.ARB_depth_clamp = GL_TRUE;
 577    }
 578
 579    /* This extension does not actually require support of floating point
 580     * render targets, just clamping controls.
 581     * Advertise this extension if either fragment color clamping is supported
 582     * or no render targets having color values outside of the range [0, 1]
 583     * are supported, in which case the fragment color clamping has no effect
 584     * on rendering.
 585     */
 586    if (screen->get_param(screen, PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL) ||
 587        (!screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 588                                      PIPE_TEXTURE_2D, 0,
 589                                      PIPE_BIND_RENDER_TARGET) &&
 590         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM,
 591                                      PIPE_TEXTURE_2D, 0,
 592                                      PIPE_BIND_RENDER_TARGET) &&
 593         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 594                                      PIPE_TEXTURE_2D, 0,
 595                                      PIPE_BIND_RENDER_TARGET) &&
 596         !screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 597                                      PIPE_TEXTURE_2D, 0,
 598                                      PIPE_BIND_RENDER_TARGET) &&
 599         !screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 600                                      PIPE_TEXTURE_2D, 0,
 601                                      PIPE_BIND_RENDER_TARGET) &&
 602         !screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 603                                      PIPE_TEXTURE_2D, 0,
 604                                      PIPE_BIND_RENDER_TARGET))) {
 605       ctx->Extensions.ARB_color_buffer_float = GL_TRUE;
 606    }
 607
 608    if (screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {
 609       ctx->Extensions.ARB_shader_stencil_export = GL_TRUE;
 610    }
 611
 612    if (screen->get_param(screen, PIPE_CAP_TGSI_INSTANCEID)) {
 613       ctx->Extensions.ARB_draw_instanced = GL_TRUE;
 614    }
 615    if (screen->get_param(screen, PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR)) {
 616       ctx->Extensions.ARB_instanced_arrays = GL_TRUE;
 617    }
 618
 619    if (screen->fence_finish) {
 620       ctx->Extensions.ARB_sync = GL_TRUE;
 621    }
 622
 623    if (st->pipe->texture_barrier) {
 624       ctx->Extensions.NV_texture_barrier = GL_TRUE;
 625    }
 626
 627    if (screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 628                                    PIPE_TEXTURE_2D, 0,
 629                                    PIPE_BIND_SAMPLER_VIEW)) {
 630       ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
 631    }
 632
 633    if (screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 634                                    PIPE_TEXTURE_2D, 0,
 635                                    PIPE_BIND_RENDER_TARGET |
 636                                    PIPE_BIND_SAMPLER_VIEW)) {
 637       ctx->Extensions.EXT_packed_float = GL_TRUE;
 638    }
 639
 640    /* Maximum sample count. */
 641    for (i = 16; i > 0; --i) {
 642       if (screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_UNORM,
 643                                       PIPE_TEXTURE_2D, i,
 644                                       PIPE_BIND_RENDER_TARGET)) {
 645          ctx->Const.MaxSamples = i;
 646          break;
 647       }
 648    }
 649
 650    if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE)) {
 651       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 652       ctx->Extensions.AMD_seamless_cubemap_per_texture = GL_TRUE;
 653    }
 654    else if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP)) {
 655       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 656    }
 657
 658    if (screen->get_param(screen, PIPE_CAP_SM3)) {
 659       ctx->Extensions.ARB_shader_texture_lod = GL_TRUE;
 660    }
 661
 662    if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT,
 663                                    PIPE_TEXTURE_2D, 0,
 664                                    PIPE_BIND_DEPTH_STENCIL |
 665                                    PIPE_BIND_SAMPLER_VIEW) &&
 666        screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT_S8X24_USCALED,
 667                                    PIPE_TEXTURE_2D, 0,
 668                                    PIPE_BIND_DEPTH_STENCIL |
 669                                    PIPE_BIND_SAMPLER_VIEW)) {
 670       ctx->Extensions.ARB_depth_buffer_float = GL_TRUE;
 671    }
 672 }