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, PIPE_CAP_MAX_LINE_WIDTH));
 117    c->MaxLineWidthAA
 118       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH_AA));
 119
 120    c->MaxPointSize
 121       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH));
 122    c->MaxPointSizeAA
 123       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH_AA));
 124    /* called after _mesa_create_context/_mesa_init_point, fix default user
 125     * settable max point size up
 126     */
 127    st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);
 128    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
 129     * for non-aa sizes, but we can go down to 0.0 for aa points.
 130     */
 131    c->MinPointSize = 1.0f;
 132    c->MinPointSizeAA = 0.0f;
 133
 134    c->MaxTextureMaxAnisotropy
 135       = _maxf(2.0f, screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_ANISOTROPY));
 136
 137    c->MaxTextureLodBias
 138       = screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_LOD_BIAS);
 139
 140    c->MaxDrawBuffers
 141       = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 142               1, MAX_DRAW_BUFFERS);
 143
 144    /* Quads always follow GL provoking rules. */
 145    c->QuadsFollowProvokingVertexConvention = GL_FALSE;
 146
 147    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh) {
 148       struct gl_shader_compiler_options *options =
 149          &st->ctx->ShaderCompilerOptions[sh];
 150       struct gl_program_constants *pc;
 151
 152       switch (sh) {
 153       case PIPE_SHADER_FRAGMENT:
 154          pc = &c->FragmentProgram;
 155          break;
 156       case PIPE_SHADER_VERTEX:
 157          pc = &c->VertexProgram;
 158          break;
 159       case PIPE_SHADER_GEOMETRY:
 160          pc = &c->GeometryProgram;
 161          break;
 162       default:
 163          assert(0);
 164          continue;
 165       }
 166
 167       pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
 168       pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
 169       pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
 170       pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
 171       pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
 172       pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
 173       pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);
 174       pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);
 175       pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
 176       /* raise MaxParameters if native support is higher */
 177       pc->MaxParameters            = MAX2(pc->MaxParameters, pc->MaxNativeParameters);
 178
 179       /* Gallium doesn't really care about local vs. env parameters so use the
 180        * same limits.
 181        */
 182       pc->MaxLocalParams = MIN2(pc->MaxParameters, MAX_PROGRAM_LOCAL_PARAMS);
 183       pc->MaxEnvParams = MIN2(pc->MaxParameters, MAX_PROGRAM_ENV_PARAMS);
 184
 185       options->EmitNoNoise = TRUE;
 186
 187       /* TODO: make these more fine-grained if anyone needs it */
 188       options->MaxIfDepth = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 189       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 190       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 191       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 192
 193       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 194
 195       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
 196                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 197       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
 198                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 199       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
 200                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 201       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
 202                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 203
 204       if (options->EmitNoLoops)
 205          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
 206    }
 207
 208    /* PIPE_CAP_MAX_FS_INPUTS specifies the number of COLORn + GENERICn inputs
 209     * and is set in MaxNativeAttribs. It's always 2 colors + N generic
 210     * attributes. The GLSL compiler never uses COLORn for varyings, so we
 211     * subtract the 2 colors to get the maximum number of varyings (generic
 212     * attributes) supported by a driver. */
 213    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_MAX_INPUTS) - 2;
 214    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 215
 216    /* XXX we'll need a better query here someday */
 217    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
 218       c->MinProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
 219       c->MaxProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
 220
 221       c->GLSLVersion = 120;
 222       _mesa_override_glsl_version(st->ctx);
 223       c->UniformBooleanTrue = ~0;
 224    }
 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    /*
 251     * Extensions that are supported by all Gallium drivers:
 252     */
 253    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 254    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 255    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
 256    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 257    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 258    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 259    ctx->Extensions.ARB_sampler_objects = GL_TRUE;
 260    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
 261    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 262    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 263    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 264    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 265    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 266    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 267    ctx->Extensions.ARB_window_pos = GL_TRUE;
 268
 269    ctx->Extensions.EXT_blend_color = GL_TRUE;
 270    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 271    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 272    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 273    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 274    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 275    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 276    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 277    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 278    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 279    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 280    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 281    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 282    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 283
 284    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 285
 286    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 287
 288    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 289
 290    ctx->Extensions.NV_blend_square = GL_TRUE;
 291    ctx->Extensions.NV_texgen_reflection = GL_TRUE;
 292    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 293    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 294 #if 0
 295    /* possibly could support the following two */
 296    ctx->Extensions.NV_vertex_program = GL_TRUE;
 297    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 298 #endif
 299
 300 #if FEATURE_OES_EGL_image
 301    ctx->Extensions.OES_EGL_image = GL_TRUE;
 302 #endif
 303 #if FEATURE_OES_draw_texture
 304    ctx->Extensions.OES_draw_texture = GL_TRUE;
 305 #endif
 306
 307    /*
 308     * Extensions that depend on the driver/hardware:
 309     */
 310    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SWIZZLE) > 0) {
 311       ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 312    }
 313
 314    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
 315       ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 316       ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 317       ctx->Extensions.ARB_shader_objects = GL_TRUE;
 318       ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 319       ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
 320       ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
 321    }
 322
 323    if (screen->get_param(screen, PIPE_CAP_BLEND_EQUATION_SEPARATE)) {
 324       ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 325    }
 326
 327    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_CLAMP) > 0) {
 328       ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 329       ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 330    }
 331
 332    if (screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES)) {
 333       ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 334    }
 335
 336    if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {
 337       ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 338       ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 339    }
 340
 341    if (screen->get_param(screen, PIPE_CAP_ANISOTROPIC_FILTER)) {
 342       ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
 343    }
 344
 345    if (screen->get_param(screen, PIPE_CAP_POINT_SPRITE)) {
 346       ctx->Extensions.ARB_point_sprite = GL_TRUE;
 347       /* GL_NV_point_sprite is not supported by gallium because we don't
 348        * support the GL_POINT_SPRITE_R_MODE_NV option.
 349        */
 350    }
 351
 352    if (screen->get_param(screen, PIPE_CAP_OCCLUSION_QUERY)) {
 353       ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 354       ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
 355    }
 356    if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY)) {
 357      ctx->Extensions.EXT_timer_query = GL_TRUE;
 358    }
 359
 360    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SHADOW_MAP)) {
 361       ctx->Extensions.ARB_depth_texture = GL_TRUE;
 362       ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 363       ctx->Extensions.ARB_shadow = GL_TRUE;
 364       ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 365       /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/
 366    }
 367
 368    /* GL_EXT_packed_depth_stencil requires both the ability to render to
 369     * a depth/stencil buffer and texture from depth/stencil source.
 370     */
 371    if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 372                                    PIPE_TEXTURE_2D, 0,
 373                                    PIPE_BIND_DEPTH_STENCIL) &&
 374        screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 375                                    PIPE_TEXTURE_2D, 0,
 376                                    PIPE_BIND_SAMPLER_VIEW)) {
 377       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 378    }
 379    else if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 380                                         PIPE_TEXTURE_2D, 0,
 381                                         PIPE_BIND_DEPTH_STENCIL) &&
 382             screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 383                                         PIPE_TEXTURE_2D, 0,
 384                                         PIPE_BIND_SAMPLER_VIEW)) {
 385       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 386    }
 387
 388    /* float support - assume nothing exclusively supports 64-bit floats */
 389    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 390                                    PIPE_TEXTURE_2D, 0,
 391                                    PIPE_BIND_SAMPLER_VIEW |
 392                                    PIPE_BIND_RENDER_TARGET) &&
 393       screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 394                                    PIPE_TEXTURE_2D, 0,
 395                                    PIPE_BIND_SAMPLER_VIEW |
 396                                    PIPE_BIND_RENDER_TARGET)) {
 397       ctx->Extensions.ARB_texture_float = GL_TRUE;
 398    }
 399
 400    /* sRGB support */
 401    if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 402                                    PIPE_TEXTURE_2D, 0,
 403                                    PIPE_BIND_SAMPLER_VIEW) ||
 404       screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 405                                    PIPE_TEXTURE_2D, 0,
 406                                    PIPE_BIND_SAMPLER_VIEW)) {
 407       ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 408       ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
 409       if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 410                                    PIPE_TEXTURE_2D, 0,
 411                                    PIPE_BIND_RENDER_TARGET) ||
 412           screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 413                                    PIPE_TEXTURE_2D, 0,
 414                                    PIPE_BIND_RENDER_TARGET)) {
 415          ctx->Extensions.EXT_framebuffer_sRGB = GL_TRUE;
 416          ctx->Const.sRGBCapable = GL_TRUE;
 417       }
 418    }
 419
 420    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM,
 421                                    PIPE_TEXTURE_2D, 0,
 422                                    PIPE_BIND_SAMPLER_VIEW)) {
 423       ctx->Extensions.ARB_texture_rg = GL_TRUE;
 424    }
 425
 426    /* s3tc support */
 427    if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 428                                    PIPE_TEXTURE_2D, 0,
 429                                    PIPE_BIND_SAMPLER_VIEW) &&
 430        (ctx->Mesa_DXTn || st_get_s3tc_override())) {
 431       ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
 432       ctx->Extensions.S3_s3tc = GL_TRUE;
 433    }
 434
 435    if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM,
 436                                    PIPE_TEXTURE_2D, 0,
 437                                    PIPE_BIND_SAMPLER_VIEW) &&
 438        screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM,
 439                                    PIPE_TEXTURE_2D, 0,
 440                                    PIPE_BIND_SAMPLER_VIEW) &&
 441        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM,
 442                                    PIPE_TEXTURE_2D, 0,
 443                                    PIPE_BIND_SAMPLER_VIEW) &&
 444        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM,
 445                                    PIPE_TEXTURE_2D, 0,
 446                                    PIPE_BIND_SAMPLER_VIEW)
 447        ) {
 448      ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
 449    }
 450
 451    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_UNORM,
 452                                    PIPE_TEXTURE_2D, 0,
 453                                    PIPE_BIND_SAMPLER_VIEW) &&
 454        screen->is_format_supported(screen, PIPE_FORMAT_LATC1_SNORM,
 455                                    PIPE_TEXTURE_2D, 0,
 456                                    PIPE_BIND_SAMPLER_VIEW) &&
 457        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 458                                    PIPE_TEXTURE_2D, 0,
 459                                    PIPE_BIND_SAMPLER_VIEW) &&
 460        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_SNORM,
 461                                    PIPE_TEXTURE_2D, 0,
 462                                    PIPE_BIND_SAMPLER_VIEW)) {
 463       ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
 464    }
 465
 466    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 467                                    PIPE_TEXTURE_2D, 0,
 468                                    PIPE_BIND_SAMPLER_VIEW)) {
 469       ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
 470    }
 471
 472    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 473                                    PIPE_TEXTURE_2D, 0,
 474                                    PIPE_BIND_SAMPLER_VIEW)) {
 475       ctx->Extensions.EXT_texture_snorm = GL_TRUE;
 476    }
 477
 478    /* ycbcr support */
 479    if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 480                                    PIPE_TEXTURE_2D, 0,
 481                                    PIPE_BIND_SAMPLER_VIEW) ||
 482        screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 483                                    PIPE_TEXTURE_2D, 0,
 484                                    PIPE_BIND_SAMPLER_VIEW)) {
 485       ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 486    }
 487
 488    /* GL_EXT_texture_array */
 489    if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS) > 1) {
 490       ctx->Extensions.EXT_texture_array = GL_TRUE;
 491       ctx->Extensions.MESA_texture_array = GL_TRUE;
 492    }
 493
 494    /* GL_ARB_framebuffer_object */
 495    if (ctx->Extensions.EXT_packed_depth_stencil) {
 496       /* we support always support GL_EXT_framebuffer_blit */
 497       ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 498    }
 499
 500    if (screen->get_param(screen, PIPE_CAP_CONDITIONAL_RENDER)) {
 501       ctx->Extensions.NV_conditional_render = GL_TRUE;
 502    }
 503
 504    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_ENABLE)) {
 505       ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
 506    }
 507
 508    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC)) {
 509       ctx->Extensions.ARB_draw_buffers_blend = GL_TRUE;
 510    }
 511
 512    /* GL_ARB_half_float_vertex */
 513    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 514                                    PIPE_BUFFER, 0,
 515                                    PIPE_BIND_VERTEX_BUFFER)) {
 516       ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
 517    }
 518
 519    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FIXED,
 520                                    PIPE_BUFFER, 0,
 521                                    PIPE_BIND_VERTEX_BUFFER)) {
 522       ctx->Extensions.ARB_ES2_compatibility = GL_TRUE;
 523    }
 524
 525    if (screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_UNORM,
 526                                    PIPE_BUFFER, 0,
 527                                    PIPE_BIND_VERTEX_BUFFER) &&
 528        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_UNORM,
 529                                    PIPE_BUFFER, 0,
 530                                    PIPE_BIND_VERTEX_BUFFER) &&
 531        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SNORM,
 532                                    PIPE_BUFFER, 0,
 533                                    PIPE_BIND_VERTEX_BUFFER) &&
 534        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SNORM,
 535                                    PIPE_BUFFER, 0,
 536                                    PIPE_BIND_VERTEX_BUFFER) &&
 537        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_USCALED,
 538                                    PIPE_BUFFER, 0,
 539                                    PIPE_BIND_VERTEX_BUFFER) &&
 540        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_USCALED,
 541                                    PIPE_BUFFER, 0,
 542                                    PIPE_BIND_VERTEX_BUFFER) &&
 543        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SSCALED,
 544                                    PIPE_BUFFER, 0,
 545                                    PIPE_BIND_VERTEX_BUFFER) &&
 546        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SSCALED,
 547                                    PIPE_BUFFER, 0,
 548                                    PIPE_BIND_VERTEX_BUFFER)) {
 549       ctx->Extensions.ARB_vertex_type_2_10_10_10_rev = GL_TRUE;
 550    }
 551
 552    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY, PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
 553 #if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
 554       ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
 555 #endif
 556    }
 557
 558    if (screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
 559       ctx->Extensions.NV_primitive_restart = GL_TRUE;
 560    }
 561
 562    if (screen->get_param(screen, PIPE_CAP_DEPTH_CLAMP)) {
 563       ctx->Extensions.ARB_depth_clamp = GL_TRUE;
 564    }
 565
 566    /* This extension does not actually require support of floating point
 567     * render targets, just clamping controls.
 568     * Advertise this extension if either fragment color clamping is supported
 569     * or no render targets having color values outside of the range [0, 1]
 570     * are supported, in which case the fragment color clamping has no effect
 571     * on rendering.
 572     */
 573    if (screen->get_param(screen, PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL) ||
 574        (!screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 575                                      PIPE_TEXTURE_2D, 0,
 576                                      PIPE_BIND_RENDER_TARGET) &&
 577         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM,
 578                                      PIPE_TEXTURE_2D, 0,
 579                                      PIPE_BIND_RENDER_TARGET) &&
 580         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 581                                      PIPE_TEXTURE_2D, 0,
 582                                      PIPE_BIND_RENDER_TARGET) &&
 583         !screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 584                                      PIPE_TEXTURE_2D, 0,
 585                                      PIPE_BIND_RENDER_TARGET) &&
 586         !screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 587                                      PIPE_TEXTURE_2D, 0,
 588                                      PIPE_BIND_RENDER_TARGET) &&
 589         !screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 590                                      PIPE_TEXTURE_2D, 0,
 591                                      PIPE_BIND_RENDER_TARGET))) {
 592       ctx->Extensions.ARB_color_buffer_float = GL_TRUE;
 593    }
 594
 595    if (screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {
 596       ctx->Extensions.ARB_shader_stencil_export = GL_TRUE;
 597    }
 598
 599    if (screen->get_param(screen, PIPE_CAP_TGSI_INSTANCEID)) {
 600       ctx->Extensions.ARB_draw_instanced = GL_TRUE;
 601    }
 602    if (screen->get_param(screen, PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR)) {
 603       ctx->Extensions.ARB_instanced_arrays = GL_TRUE;
 604    }
 605
 606    if (screen->fence_finish) {
 607       ctx->Extensions.ARB_sync = GL_TRUE;
 608    }
 609
 610    if (screen->get_param(screen, PIPE_CAP_TEXTURE_BARRIER)) {
 611       ctx->Extensions.NV_texture_barrier = GL_TRUE;
 612    }
 613
 614    if (screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 615                                    PIPE_TEXTURE_2D, 0,
 616                                    PIPE_BIND_SAMPLER_VIEW)) {
 617       ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
 618    }
 619
 620    if (screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 621                                    PIPE_TEXTURE_2D, 0,
 622                                    PIPE_BIND_RENDER_TARGET |
 623                                    PIPE_BIND_SAMPLER_VIEW)) {
 624       ctx->Extensions.EXT_packed_float = GL_TRUE;
 625    }
 626
 627    /* Maximum sample count. */
 628    for (i = 16; i > 0; --i) {
 629       if (screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_UNORM,
 630                                       PIPE_TEXTURE_2D, i,
 631                                       PIPE_BIND_RENDER_TARGET)) {
 632          ctx->Const.MaxSamples = i;
 633          break;
 634       }
 635    }
 636
 637    if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE)) {
 638       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 639       ctx->Extensions.AMD_seamless_cubemap_per_texture = GL_TRUE;
 640    }
 641    else if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP)) {
 642       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 643    }
 644
 645    if (screen->get_param(screen, PIPE_CAP_SM3)) {
 646       ctx->Extensions.ARB_shader_texture_lod = GL_TRUE;
 647    }
 648
 649    if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT,
 650                                    PIPE_TEXTURE_2D, 0,
 651                                    PIPE_BIND_DEPTH_STENCIL |
 652                                    PIPE_BIND_SAMPLER_VIEW) &&
 653        screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT_S8X24_USCALED,
 654                                    PIPE_TEXTURE_2D, 0,
 655                                    PIPE_BIND_DEPTH_STENCIL |
 656                                    PIPE_BIND_SAMPLER_VIEW)) {
 657       ctx->Extensions.ARB_depth_buffer_float = GL_TRUE;
 658    }
 659 }