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_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS),
  94             MAX_TEXTURE_IMAGE_UNITS);
  95
  96    c->MaxVertexTextureImageUnits
  97       = _min(screen->get_param(screen, PIPE_CAP_MAX_VERTEX_TEXTURE_UNITS),
  98              MAX_VERTEX_TEXTURE_IMAGE_UNITS);
  99
 100    c->MaxCombinedTextureImageUnits
 101       = _min(screen->get_param(screen, PIPE_CAP_MAX_COMBINED_SAMPLERS),
 102              MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 103
 104    c->MaxTextureCoordUnits
 105       = _min(c->MaxTextureImageUnits, MAX_TEXTURE_COORD_UNITS);
 106
 107    c->MaxTextureUnits = _min(c->MaxTextureImageUnits, c->MaxTextureCoordUnits);
 108
 109    c->MaxDrawBuffers
 110       = _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 111               1, MAX_DRAW_BUFFERS);
 112
 113    c->MaxLineWidth
 114       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH));
 115    c->MaxLineWidthAA
 116       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH_AA));
 117
 118    c->MaxPointSize
 119       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH));
 120    c->MaxPointSizeAA
 121       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH_AA));
 122    /* called after _mesa_create_context/_mesa_init_point, fix default user
 123     * settable max point size up
 124     */
 125    st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);
 126    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
 127     * for non-aa sizes, but we can go down to 0.0 for aa points.
 128     */
 129    c->MinPointSize = 1.0f;
 130    c->MinPointSizeAA = 0.0f;
 131
 132    c->MaxTextureMaxAnisotropy
 133       = _maxf(2.0f, screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_ANISOTROPY));
 134
 135    c->MaxTextureLodBias
 136       = screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_LOD_BIAS);
 137
 138    c->MaxDrawBuffers
 139       = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 140               1, MAX_DRAW_BUFFERS);
 141
 142    /* Quads always follow GL provoking rules. */
 143    c->QuadsFollowProvokingVertexConvention = GL_FALSE;
 144
 145    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh) {
 146       struct gl_shader_compiler_options *options =
 147          &st->ctx->ShaderCompilerOptions[sh];
 148       struct gl_program_constants *pc;
 149
 150       switch (sh) {
 151       case PIPE_SHADER_FRAGMENT:
 152          pc = &c->FragmentProgram;
 153          break;
 154       case PIPE_SHADER_VERTEX:
 155          pc = &c->VertexProgram;
 156          break;
 157       case PIPE_SHADER_GEOMETRY:
 158          pc = &c->GeometryProgram;
 159          break;
 160       default:
 161          assert(0);
 162          continue;
 163       }
 164
 165       pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
 166       pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
 167       pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
 168       pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
 169       pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
 170       pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
 171       pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);
 172       pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);
 173       pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
 174       /* raise MaxParameters if native support is higher */
 175       pc->MaxParameters            = MAX2(pc->MaxParameters, pc->MaxNativeParameters);
 176
 177       /* Gallium doesn't really care about local vs. env parameters so use the
 178        * same limits.
 179        */
 180       pc->MaxLocalParams = MIN2(pc->MaxParameters, MAX_PROGRAM_LOCAL_PARAMS);
 181       pc->MaxEnvParams = MIN2(pc->MaxParameters, MAX_PROGRAM_ENV_PARAMS);
 182
 183       options->EmitNoNoise = TRUE;
 184
 185       /* TODO: make these more fine-grained if anyone needs it */
 186       options->MaxIfDepth = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 187       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 188       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 189       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 190
 191       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 192
 193       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
 194                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 195       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
 196                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 197       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
 198                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 199       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
 200                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 201
 202       if (options->EmitNoLoops)
 203          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
 204    }
 205
 206    /* PIPE_CAP_MAX_FS_INPUTS specifies the number of COLORn + GENERICn inputs
 207     * and is set in MaxNativeAttribs. It's always 2 colors + N generic
 208     * attributes. The GLSL compiler never uses COLORn for varyings, so we
 209     * subtract the 2 colors to get the maximum number of varyings (generic
 210     * attributes) supported by a driver. */
 211    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_MAX_INPUTS) - 2;
 212    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 213
 214    /* XXX we'll need a better query here someday */
 215    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
 216       c->MinProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
 217       c->MaxProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
 218
 219       c->GLSLVersion = 120;
 220       _mesa_override_glsl_version(st->ctx);
 221       c->UniformBooleanTrue = ~0;
 222    }
 223 }
 224
 225
 226 static GLboolean st_get_s3tc_override(void)
 227 {
 228    const char *override = _mesa_getenv("force_s3tc_enable");
 229    if (override && !strcmp(override, "true"))
 230       return GL_TRUE;
 231    return GL_FALSE;
 232 }
 233
 234
 235 /**
 236  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
 237  * which GL extensions are supported.
 238  * Quite a few extensions are always supported because they are standard
 239  * features or can be built on top of other gallium features.
 240  * Some fine tuning may still be needed.
 241  */
 242 void st_init_extensions(struct st_context *st)
 243 {
 244    struct pipe_screen *screen = st->pipe->screen;
 245    struct gl_context *ctx = st->ctx;
 246    int i;
 247
 248    /*
 249     * Extensions that are supported by all Gallium drivers:
 250     */
 251    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 252    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 253    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
 254    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 255    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 256    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 257    ctx->Extensions.ARB_sampler_objects = GL_TRUE;
 258    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
 259    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 260    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 261    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 262    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 263    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 264    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 265    ctx->Extensions.ARB_window_pos = GL_TRUE;
 266
 267    ctx->Extensions.EXT_blend_color = GL_TRUE;
 268    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 269    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 270    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 271    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 272    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 273    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 274    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 275    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 276    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 277    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 278    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 279    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 280    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 281    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 282    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 283    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 284
 285    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 286
 287    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 288
 289    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 290
 291    ctx->Extensions.NV_blend_square = GL_TRUE;
 292    ctx->Extensions.NV_texgen_reflection = GL_TRUE;
 293    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 294    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 295 #if 0
 296    /* possibly could support the following two */
 297    ctx->Extensions.NV_vertex_program = GL_TRUE;
 298    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 299 #endif
 300
 301 #if FEATURE_OES_EGL_image
 302    ctx->Extensions.OES_EGL_image = GL_TRUE;
 303 #endif
 304 #if FEATURE_OES_draw_texture
 305    ctx->Extensions.OES_draw_texture = GL_TRUE;
 306 #endif
 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_TWO_SIDED_STENCIL)) {
 346       ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 347       ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 348    }
 349
 350    if (screen->get_param(screen, PIPE_CAP_ANISOTROPIC_FILTER)) {
 351       ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
 352    }
 353
 354    if (screen->get_param(screen, PIPE_CAP_POINT_SPRITE)) {
 355       ctx->Extensions.ARB_point_sprite = GL_TRUE;
 356       /* GL_NV_point_sprite is not supported by gallium because we don't
 357        * support the GL_POINT_SPRITE_R_MODE_NV option.
 358        */
 359    }
 360
 361    if (screen->get_param(screen, PIPE_CAP_OCCLUSION_QUERY)) {
 362       ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 363       ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
 364    }
 365    if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY)) {
 366      ctx->Extensions.EXT_timer_query = GL_TRUE;
 367    }
 368
 369    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SHADOW_MAP)) {
 370       ctx->Extensions.ARB_depth_texture = GL_TRUE;
 371       ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 372       ctx->Extensions.ARB_shadow = GL_TRUE;
 373       ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 374       /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/
 375    }
 376
 377    /* GL_EXT_packed_depth_stencil requires both the ability to render to
 378     * a depth/stencil buffer and texture from depth/stencil source.
 379     */
 380    if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 381                                    PIPE_TEXTURE_2D, 0,
 382                                    PIPE_BIND_DEPTH_STENCIL) &&
 383        screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 384                                    PIPE_TEXTURE_2D, 0,
 385                                    PIPE_BIND_SAMPLER_VIEW)) {
 386       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 387    }
 388    else if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 389                                         PIPE_TEXTURE_2D, 0,
 390                                         PIPE_BIND_DEPTH_STENCIL) &&
 391             screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 392                                         PIPE_TEXTURE_2D, 0,
 393                                         PIPE_BIND_SAMPLER_VIEW)) {
 394       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 395    }
 396
 397    /* float support - assume nothing exclusively supports 64-bit floats */
 398    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 399                                    PIPE_TEXTURE_2D, 0,
 400                                    PIPE_BIND_SAMPLER_VIEW |
 401                                    PIPE_BIND_RENDER_TARGET) &&
 402       screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 403                                    PIPE_TEXTURE_2D, 0,
 404                                    PIPE_BIND_SAMPLER_VIEW |
 405                                    PIPE_BIND_RENDER_TARGET)) {
 406       ctx->Extensions.ARB_texture_float = GL_TRUE;
 407    }
 408
 409    /* sRGB support */
 410    if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 411                                    PIPE_TEXTURE_2D, 0,
 412                                    PIPE_BIND_SAMPLER_VIEW) ||
 413       screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 414                                    PIPE_TEXTURE_2D, 0,
 415                                    PIPE_BIND_SAMPLER_VIEW)) {
 416       ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 417       ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
 418       if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 419                                    PIPE_TEXTURE_2D, 0,
 420                                    PIPE_BIND_RENDER_TARGET) ||
 421           screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 422                                    PIPE_TEXTURE_2D, 0,
 423                                    PIPE_BIND_RENDER_TARGET)) {
 424          ctx->Extensions.EXT_framebuffer_sRGB = GL_TRUE;
 425          ctx->Const.sRGBCapable = GL_TRUE;
 426       }
 427    }
 428
 429    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM,
 430                                    PIPE_TEXTURE_2D, 0,
 431                                    PIPE_BIND_SAMPLER_VIEW)) {
 432       ctx->Extensions.ARB_texture_rg = GL_TRUE;
 433    }
 434
 435    /* s3tc support */
 436    if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 437                                    PIPE_TEXTURE_2D, 0,
 438                                    PIPE_BIND_SAMPLER_VIEW) &&
 439        (ctx->Mesa_DXTn || st_get_s3tc_override())) {
 440       ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
 441       ctx->Extensions.S3_s3tc = GL_TRUE;
 442    }
 443
 444    if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM,
 445                                    PIPE_TEXTURE_2D, 0,
 446                                    PIPE_BIND_SAMPLER_VIEW) &&
 447        screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM,
 448                                    PIPE_TEXTURE_2D, 0,
 449                                    PIPE_BIND_SAMPLER_VIEW) &&
 450        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM,
 451                                    PIPE_TEXTURE_2D, 0,
 452                                    PIPE_BIND_SAMPLER_VIEW) &&
 453        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM,
 454                                    PIPE_TEXTURE_2D, 0,
 455                                    PIPE_BIND_SAMPLER_VIEW)
 456        ) {
 457      ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
 458    }
 459
 460    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_UNORM,
 461                                    PIPE_TEXTURE_2D, 0,
 462                                    PIPE_BIND_SAMPLER_VIEW) &&
 463        screen->is_format_supported(screen, PIPE_FORMAT_LATC1_SNORM,
 464                                    PIPE_TEXTURE_2D, 0,
 465                                    PIPE_BIND_SAMPLER_VIEW) &&
 466        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 467                                    PIPE_TEXTURE_2D, 0,
 468                                    PIPE_BIND_SAMPLER_VIEW) &&
 469        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_SNORM,
 470                                    PIPE_TEXTURE_2D, 0,
 471                                    PIPE_BIND_SAMPLER_VIEW)) {
 472       ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
 473    }
 474
 475    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 476                                    PIPE_TEXTURE_2D, 0,
 477                                    PIPE_BIND_SAMPLER_VIEW)) {
 478       ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
 479    }
 480
 481    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 482                                    PIPE_TEXTURE_2D, 0,
 483                                    PIPE_BIND_SAMPLER_VIEW)) {
 484       ctx->Extensions.EXT_texture_snorm = GL_TRUE;
 485    }
 486
 487    /* ycbcr support */
 488    if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 489                                    PIPE_TEXTURE_2D, 0,
 490                                    PIPE_BIND_SAMPLER_VIEW) ||
 491        screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 492                                    PIPE_TEXTURE_2D, 0,
 493                                    PIPE_BIND_SAMPLER_VIEW)) {
 494       ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 495    }
 496
 497    /* GL_EXT_texture_array */
 498    if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS) > 1) {
 499       ctx->Extensions.EXT_texture_array = GL_TRUE;
 500       ctx->Extensions.MESA_texture_array = GL_TRUE;
 501    }
 502
 503    /* GL_ARB_framebuffer_object */
 504    if (ctx->Extensions.EXT_packed_depth_stencil) {
 505       /* we support always support GL_EXT_framebuffer_blit */
 506       ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 507    }
 508
 509    if (st->pipe->render_condition) {
 510       ctx->Extensions.NV_conditional_render = GL_TRUE;
 511    }
 512
 513    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_ENABLE)) {
 514       ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
 515    }
 516
 517    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC)) {
 518       ctx->Extensions.ARB_draw_buffers_blend = GL_TRUE;
 519    }
 520
 521    /* GL_ARB_half_float_vertex */
 522    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 523                                    PIPE_BUFFER, 0,
 524                                    PIPE_BIND_VERTEX_BUFFER)) {
 525       ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
 526    }
 527
 528    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FIXED,
 529                                    PIPE_BUFFER, 0,
 530                                    PIPE_BIND_VERTEX_BUFFER)) {
 531       ctx->Extensions.ARB_ES2_compatibility = GL_TRUE;
 532    }
 533
 534    if (screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_UNORM,
 535                                    PIPE_BUFFER, 0,
 536                                    PIPE_BIND_VERTEX_BUFFER) &&
 537        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_UNORM,
 538                                    PIPE_BUFFER, 0,
 539                                    PIPE_BIND_VERTEX_BUFFER) &&
 540        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SNORM,
 541                                    PIPE_BUFFER, 0,
 542                                    PIPE_BIND_VERTEX_BUFFER) &&
 543        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SNORM,
 544                                    PIPE_BUFFER, 0,
 545                                    PIPE_BIND_VERTEX_BUFFER) &&
 546        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_USCALED,
 547                                    PIPE_BUFFER, 0,
 548                                    PIPE_BIND_VERTEX_BUFFER) &&
 549        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_USCALED,
 550                                    PIPE_BUFFER, 0,
 551                                    PIPE_BIND_VERTEX_BUFFER) &&
 552        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SSCALED,
 553                                    PIPE_BUFFER, 0,
 554                                    PIPE_BIND_VERTEX_BUFFER) &&
 555        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SSCALED,
 556                                    PIPE_BUFFER, 0,
 557                                    PIPE_BIND_VERTEX_BUFFER)) {
 558       ctx->Extensions.ARB_vertex_type_2_10_10_10_rev = GL_TRUE;
 559    }
 560
 561    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY, PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
 562 #if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
 563       ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
 564 #endif
 565    }
 566
 567    if (screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
 568       ctx->Extensions.NV_primitive_restart = GL_TRUE;
 569    }
 570
 571    if (screen->get_param(screen, PIPE_CAP_DEPTH_CLAMP)) {
 572       ctx->Extensions.ARB_depth_clamp = GL_TRUE;
 573    }
 574
 575    /* This extension does not actually require support of floating point
 576     * render targets, just clamping controls.
 577     * Advertise this extension if either fragment color clamping is supported
 578     * or no render targets having color values outside of the range [0, 1]
 579     * are supported, in which case the fragment color clamping has no effect
 580     * on rendering.
 581     */
 582    if (screen->get_param(screen, PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL) ||
 583        (!screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 584                                      PIPE_TEXTURE_2D, 0,
 585                                      PIPE_BIND_RENDER_TARGET) &&
 586         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM,
 587                                      PIPE_TEXTURE_2D, 0,
 588                                      PIPE_BIND_RENDER_TARGET) &&
 589         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 590                                      PIPE_TEXTURE_2D, 0,
 591                                      PIPE_BIND_RENDER_TARGET) &&
 592         !screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 593                                      PIPE_TEXTURE_2D, 0,
 594                                      PIPE_BIND_RENDER_TARGET) &&
 595         !screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 596                                      PIPE_TEXTURE_2D, 0,
 597                                      PIPE_BIND_RENDER_TARGET) &&
 598         !screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 599                                      PIPE_TEXTURE_2D, 0,
 600                                      PIPE_BIND_RENDER_TARGET))) {
 601       ctx->Extensions.ARB_color_buffer_float = GL_TRUE;
 602    }
 603
 604    if (screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {
 605       ctx->Extensions.ARB_shader_stencil_export = GL_TRUE;
 606    }
 607
 608    if (screen->get_param(screen, PIPE_CAP_TGSI_INSTANCEID)) {
 609       ctx->Extensions.ARB_draw_instanced = GL_TRUE;
 610    }
 611    if (screen->get_param(screen, PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR)) {
 612       ctx->Extensions.ARB_instanced_arrays = GL_TRUE;
 613    }
 614
 615    if (screen->fence_finish) {
 616       ctx->Extensions.ARB_sync = GL_TRUE;
 617    }
 618
 619    if (st->pipe->texture_barrier) {
 620       ctx->Extensions.NV_texture_barrier = GL_TRUE;
 621    }
 622
 623    if (screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 624                                    PIPE_TEXTURE_2D, 0,
 625                                    PIPE_BIND_SAMPLER_VIEW)) {
 626       ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
 627    }
 628
 629    if (screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 630                                    PIPE_TEXTURE_2D, 0,
 631                                    PIPE_BIND_RENDER_TARGET |
 632                                    PIPE_BIND_SAMPLER_VIEW)) {
 633       ctx->Extensions.EXT_packed_float = GL_TRUE;
 634    }
 635
 636    /* Maximum sample count. */
 637    for (i = 16; i > 0; --i) {
 638       if (screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_UNORM,
 639                                       PIPE_TEXTURE_2D, i,
 640                                       PIPE_BIND_RENDER_TARGET)) {
 641          ctx->Const.MaxSamples = i;
 642          break;
 643       }
 644    }
 645
 646    if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE)) {
 647       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 648       ctx->Extensions.AMD_seamless_cubemap_per_texture = GL_TRUE;
 649    }
 650    else if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP)) {
 651       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 652    }
 653
 654    if (screen->get_param(screen, PIPE_CAP_SM3)) {
 655       ctx->Extensions.ARB_shader_texture_lod = GL_TRUE;
 656    }
 657
 658    if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT,
 659                                    PIPE_TEXTURE_2D, 0,
 660                                    PIPE_BIND_DEPTH_STENCIL |
 661                                    PIPE_BIND_SAMPLER_VIEW) &&
 662        screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT_S8X24_USCALED,
 663                                    PIPE_TEXTURE_2D, 0,
 664                                    PIPE_BIND_DEPTH_STENCIL |
 665                                    PIPE_BIND_SAMPLER_VIEW)) {
 666       ctx->Extensions.ARB_depth_buffer_float = GL_TRUE;
 667    }
 668 }