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->MaxArrayTextureLayers
  89       = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS);
  90
  91    c->MaxTextureImageUnits
  92       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS),
  93             MAX_TEXTURE_IMAGE_UNITS);
  94
  95    c->MaxVertexTextureImageUnits
  96       = _min(screen->get_param(screen, PIPE_CAP_MAX_VERTEX_TEXTURE_UNITS),
  97              MAX_VERTEX_TEXTURE_IMAGE_UNITS);
  98
  99    c->MaxCombinedTextureImageUnits
 100       = _min(screen->get_param(screen, PIPE_CAP_MAX_COMBINED_SAMPLERS),
 101              MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 102
 103    c->MaxTextureCoordUnits
 104       = _min(c->MaxTextureImageUnits, MAX_TEXTURE_COORD_UNITS);
 105
 106    c->MaxTextureUnits = _min(c->MaxTextureImageUnits, c->MaxTextureCoordUnits);
 107
 108    c->MaxDrawBuffers
 109       = _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 110               1, MAX_DRAW_BUFFERS);
 111
 112    c->MaxLineWidth
 113       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH));
 114    c->MaxLineWidthAA
 115       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH_AA));
 116
 117    c->MaxPointSize
 118       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH));
 119    c->MaxPointSizeAA
 120       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH_AA));
 121    /* called after _mesa_create_context/_mesa_init_point, fix default user
 122     * settable max point size up
 123     */
 124    st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);
 125    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
 126     * for non-aa sizes, but we can go down to 0.0 for aa points.
 127     */
 128    c->MinPointSize = 1.0f;
 129    c->MinPointSizeAA = 0.0f;
 130
 131    c->MaxTextureMaxAnisotropy
 132       = _maxf(2.0f, screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_ANISOTROPY));
 133
 134    c->MaxTextureLodBias
 135       = screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_LOD_BIAS);
 136
 137    c->MaxDrawBuffers
 138       = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 139               1, MAX_DRAW_BUFFERS);
 140
 141    /* Quads always follow GL provoking rules. */
 142    c->QuadsFollowProvokingVertexConvention = GL_FALSE;
 143
 144    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh) {
 145       struct gl_shader_compiler_options *options =
 146          &st->ctx->ShaderCompilerOptions[sh];
 147       struct gl_program_constants *pc;
 148
 149       switch (sh) {
 150       case PIPE_SHADER_FRAGMENT:
 151          pc = &c->FragmentProgram;
 152          break;
 153       case PIPE_SHADER_VERTEX:
 154          pc = &c->VertexProgram;
 155          break;
 156       case PIPE_SHADER_GEOMETRY:
 157          pc = &c->GeometryProgram;
 158          break;
 159       default:
 160          assert(0);
 161          continue;
 162       }
 163
 164       pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
 165       pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
 166       pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
 167       pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
 168       pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
 169       pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
 170       pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);
 171       pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);
 172       pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
 173       /* raise MaxParameters if native support is higher */
 174       pc->MaxParameters            = MAX2(pc->MaxParameters, pc->MaxNativeParameters);
 175
 176       /* Gallium doesn't really care about local vs. env parameters so use the
 177        * same limits.
 178        */
 179       pc->MaxLocalParams = MIN2(pc->MaxParameters, MAX_PROGRAM_LOCAL_PARAMS);
 180       pc->MaxEnvParams = MIN2(pc->MaxParameters, MAX_PROGRAM_ENV_PARAMS);
 181
 182       options->EmitNoNoise = TRUE;
 183
 184       /* TODO: make these more fine-grained if anyone needs it */
 185       options->MaxIfDepth = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 186       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 187       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 188       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 189
 190       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 191
 192       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
 193                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 194       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
 195                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 196       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
 197                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 198       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
 199                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 200
 201       if (options->EmitNoLoops)
 202          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
 203    }
 204
 205    /* PIPE_CAP_MAX_FS_INPUTS specifies the number of COLORn + GENERICn inputs
 206     * and is set in MaxNativeAttribs. It's always 2 colors + N generic
 207     * attributes. The GLSL compiler never uses COLORn for varyings, so we
 208     * subtract the 2 colors to get the maximum number of varyings (generic
 209     * attributes) supported by a driver. */
 210    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_MAX_INPUTS) - 2;
 211    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 212
 213    /* XXX we'll need a better query here someday */
 214    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
 215       c->MinProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
 216       c->MaxProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
 217
 218       c->GLSLVersion = 120;
 219       c->UniformBooleanTrue = ~0;
 220    }
 221 }
 222
 223
 224 static GLboolean st_get_s3tc_override(void)
 225 {
 226    const char *override = _mesa_getenv("force_s3tc_enable");
 227    if (override && !strcmp(override, "true"))
 228       return GL_TRUE;
 229    return GL_FALSE;
 230 }
 231
 232
 233 /**
 234  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
 235  * which GL extensions are supported.
 236  * Quite a few extensions are always supported because they are standard
 237  * features or can be built on top of other gallium features.
 238  * Some fine tuning may still be needed.
 239  */
 240 void st_init_extensions(struct st_context *st)
 241 {
 242    struct pipe_screen *screen = st->pipe->screen;
 243    struct gl_context *ctx = st->ctx;
 244    int i;
 245
 246    /*
 247     * Extensions that are supported by all Gallium drivers:
 248     */
 249    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 250    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 251    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
 252    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 253    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 254    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 255    ctx->Extensions.ARB_sampler_objects = GL_TRUE;
 256    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
 257    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 258    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 259    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 260    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 261    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 262    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 263    ctx->Extensions.ARB_window_pos = GL_TRUE;
 264
 265    ctx->Extensions.EXT_blend_color = GL_TRUE;
 266    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 267    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 268    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 269    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 270    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 271    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 272    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 273    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 274    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 275    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 276    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 277    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 278    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 279    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 280    ctx->Extensions.EXT_texture_env_combine = 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    if (ctx->API == API_OPENGLES || ctx->API == API_OPENGLES2)
 285            ctx->Extensions.EXT_texture_format_BGRA8888 = GL_TRUE;
 286
 287    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 288
 289    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 290
 291    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 292
 293    ctx->Extensions.NV_blend_square = GL_TRUE;
 294    ctx->Extensions.NV_texgen_reflection = GL_TRUE;
 295    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 296    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 297 #if 0
 298    /* possibly could support the following two */
 299    ctx->Extensions.NV_vertex_program = GL_TRUE;
 300    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 301 #endif
 302
 303 #if FEATURE_OES_EGL_image
 304    ctx->Extensions.OES_EGL_image = GL_TRUE;
 305 #endif
 306 #if FEATURE_OES_draw_texture
 307    ctx->Extensions.OES_draw_texture = GL_TRUE;
 308 #endif
 309
 310    /*
 311     * Extensions that depend on the driver/hardware:
 312     */
 313    if (screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS) > 0) {
 314       ctx->Extensions.ARB_draw_buffers = GL_TRUE;
 315    }
 316
 317    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SWIZZLE) > 0) {
 318       ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 319    }
 320
 321    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
 322       ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 323       ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 324       ctx->Extensions.ARB_shader_objects = GL_TRUE;
 325       ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 326       ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
 327       ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
 328    }
 329
 330    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_REPEAT) > 0) {
 331       ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 332    }
 333
 334    if (screen->get_param(screen, PIPE_CAP_BLEND_EQUATION_SEPARATE)) {
 335       ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 336    }
 337
 338    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_CLAMP) > 0) {
 339       ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 340       ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 341    }
 342
 343    if (screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES)) {
 344       ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 345    }
 346
 347    if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS) > 1) {
 348       ctx->Extensions.ARB_multitexture = GL_TRUE;
 349    }
 350
 351    if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {
 352       ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 353       ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 354    }
 355
 356    if (screen->get_param(screen, PIPE_CAP_ANISOTROPIC_FILTER)) {
 357       ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
 358    }
 359
 360    if (screen->get_param(screen, PIPE_CAP_POINT_SPRITE)) {
 361       ctx->Extensions.ARB_point_sprite = GL_TRUE;
 362       /* GL_NV_point_sprite is not supported by gallium because we don't
 363        * support the GL_POINT_SPRITE_R_MODE_NV option.
 364        */
 365    }
 366
 367    if (screen->get_param(screen, PIPE_CAP_OCCLUSION_QUERY)) {
 368       ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 369       ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
 370    }
 371    if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY)) {
 372      ctx->Extensions.EXT_timer_query = GL_TRUE;
 373    }
 374
 375    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SHADOW_MAP)) {
 376       ctx->Extensions.ARB_depth_texture = GL_TRUE;
 377       ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 378       ctx->Extensions.ARB_shadow = GL_TRUE;
 379       ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 380       /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/
 381    }
 382
 383    /* GL_EXT_packed_depth_stencil requires both the ability to render to
 384     * a depth/stencil buffer and texture from depth/stencil source.
 385     */
 386    if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 387                                    PIPE_TEXTURE_2D, 0,
 388                                    PIPE_BIND_DEPTH_STENCIL) &&
 389        screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 390                                    PIPE_TEXTURE_2D, 0,
 391                                    PIPE_BIND_SAMPLER_VIEW)) {
 392       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 393    }
 394    else if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 395                                         PIPE_TEXTURE_2D, 0,
 396                                         PIPE_BIND_DEPTH_STENCIL) &&
 397             screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 398                                         PIPE_TEXTURE_2D, 0,
 399                                         PIPE_BIND_SAMPLER_VIEW)) {
 400       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 401    }
 402
 403    /* float support - assume nothing exclusively supports 64-bit floats */
 404    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 405                                    PIPE_TEXTURE_2D, 0,
 406                                    PIPE_BIND_SAMPLER_VIEW |
 407                                    PIPE_BIND_RENDER_TARGET) &&
 408       screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 409                                    PIPE_TEXTURE_2D, 0,
 410                                    PIPE_BIND_SAMPLER_VIEW |
 411                                    PIPE_BIND_RENDER_TARGET)) {
 412       ctx->Extensions.ARB_texture_float = GL_TRUE;
 413    }
 414
 415    /* sRGB support */
 416    if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 417                                    PIPE_TEXTURE_2D, 0,
 418                                    PIPE_BIND_SAMPLER_VIEW) ||
 419       screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 420                                    PIPE_TEXTURE_2D, 0,
 421                                    PIPE_BIND_SAMPLER_VIEW)) {
 422       ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 423       ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
 424       if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 425                                    PIPE_TEXTURE_2D, 0,
 426                                    PIPE_BIND_RENDER_TARGET) ||
 427           screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 428                                    PIPE_TEXTURE_2D, 0,
 429                                    PIPE_BIND_RENDER_TARGET)) {
 430          ctx->Extensions.EXT_framebuffer_sRGB = GL_TRUE;
 431          ctx->Const.sRGBCapable = GL_TRUE;
 432       }
 433    }
 434
 435    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM,
 436                                    PIPE_TEXTURE_2D, 0,
 437                                    PIPE_BIND_SAMPLER_VIEW)) {
 438       ctx->Extensions.ARB_texture_rg = GL_TRUE;
 439    }
 440
 441    /* s3tc support */
 442    if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 443                                    PIPE_TEXTURE_2D, 0,
 444                                    PIPE_BIND_SAMPLER_VIEW) &&
 445        (ctx->Mesa_DXTn || st_get_s3tc_override())) {
 446       ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
 447       ctx->Extensions.S3_s3tc = GL_TRUE;
 448    }
 449
 450    if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM,
 451                                    PIPE_TEXTURE_2D, 0,
 452                                    PIPE_BIND_SAMPLER_VIEW) &&
 453        screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM,
 454                                    PIPE_TEXTURE_2D, 0,
 455                                    PIPE_BIND_SAMPLER_VIEW) &&
 456        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM,
 457                                    PIPE_TEXTURE_2D, 0,
 458                                    PIPE_BIND_SAMPLER_VIEW) &&
 459        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM,
 460                                    PIPE_TEXTURE_2D, 0,
 461                                    PIPE_BIND_SAMPLER_VIEW)
 462        ) {
 463      ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
 464    }
 465
 466    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_UNORM,
 467                                    PIPE_TEXTURE_2D, 0,
 468                                    PIPE_BIND_SAMPLER_VIEW) &&
 469        screen->is_format_supported(screen, PIPE_FORMAT_LATC1_SNORM,
 470                                    PIPE_TEXTURE_2D, 0,
 471                                    PIPE_BIND_SAMPLER_VIEW) &&
 472        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 473                                    PIPE_TEXTURE_2D, 0,
 474                                    PIPE_BIND_SAMPLER_VIEW) &&
 475        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_SNORM,
 476                                    PIPE_TEXTURE_2D, 0,
 477                                    PIPE_BIND_SAMPLER_VIEW)) {
 478       ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
 479    }
 480
 481    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 482                                    PIPE_TEXTURE_2D, 0,
 483                                    PIPE_BIND_SAMPLER_VIEW)) {
 484       ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
 485    }
 486
 487    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 488                                    PIPE_TEXTURE_2D, 0,
 489                                    PIPE_BIND_SAMPLER_VIEW)) {
 490       ctx->Extensions.EXT_texture_snorm = GL_TRUE;
 491    }
 492
 493    /* ycbcr support */
 494    if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 495                                    PIPE_TEXTURE_2D, 0,
 496                                    PIPE_BIND_SAMPLER_VIEW) ||
 497        screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 498                                    PIPE_TEXTURE_2D, 0,
 499                                    PIPE_BIND_SAMPLER_VIEW)) {
 500       ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 501    }
 502
 503    /* GL_EXT_texture_array */
 504    if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS) > 1) {
 505       ctx->Extensions.EXT_texture_array = GL_TRUE;
 506       ctx->Extensions.MESA_texture_array = GL_TRUE;
 507    }
 508
 509    /* GL_ARB_framebuffer_object */
 510    if (ctx->Extensions.EXT_packed_depth_stencil) {
 511       /* we support always support GL_EXT_framebuffer_blit */
 512       ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 513    }
 514
 515    if (st->pipe->render_condition) {
 516       ctx->Extensions.NV_conditional_render = GL_TRUE;
 517    }
 518
 519    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_ENABLE)) {
 520       ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
 521    }
 522
 523    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC)) {
 524       ctx->Extensions.ARB_draw_buffers_blend = GL_TRUE;
 525    }
 526
 527    /* GL_ARB_half_float_vertex */
 528    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 529                                    PIPE_BUFFER, 0,
 530                                    PIPE_BIND_VERTEX_BUFFER)) {
 531       ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
 532    }
 533
 534    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FIXED,
 535                                    PIPE_BUFFER, 0,
 536                                    PIPE_BIND_VERTEX_BUFFER)) {
 537       ctx->Extensions.ARB_ES2_compatibility = GL_TRUE;
 538    }
 539
 540    if (screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_UNORM,
 541                                    PIPE_BUFFER, 0,
 542                                    PIPE_BIND_VERTEX_BUFFER) &&
 543        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_UNORM,
 544                                    PIPE_BUFFER, 0,
 545                                    PIPE_BIND_VERTEX_BUFFER) &&
 546        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SNORM,
 547                                    PIPE_BUFFER, 0,
 548                                    PIPE_BIND_VERTEX_BUFFER) &&
 549        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SNORM,
 550                                    PIPE_BUFFER, 0,
 551                                    PIPE_BIND_VERTEX_BUFFER) &&
 552        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_USCALED,
 553                                    PIPE_BUFFER, 0,
 554                                    PIPE_BIND_VERTEX_BUFFER) &&
 555        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_USCALED,
 556                                    PIPE_BUFFER, 0,
 557                                    PIPE_BIND_VERTEX_BUFFER) &&
 558        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SSCALED,
 559                                    PIPE_BUFFER, 0,
 560                                    PIPE_BIND_VERTEX_BUFFER) &&
 561        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SSCALED,
 562                                    PIPE_BUFFER, 0,
 563                                    PIPE_BIND_VERTEX_BUFFER)) {
 564       ctx->Extensions.ARB_vertex_type_2_10_10_10_rev = GL_TRUE;
 565    }
 566
 567    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY, PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
 568 #if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
 569       ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
 570 #endif
 571    }
 572
 573    if (screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
 574       ctx->Extensions.NV_primitive_restart = GL_TRUE;
 575    }
 576
 577    if (screen->get_param(screen, PIPE_CAP_DEPTH_CLAMP)) {
 578       ctx->Extensions.ARB_depth_clamp = GL_TRUE;
 579    }
 580
 581    /* This extension does not actually require support of floating point
 582     * render targets, just clamping controls.
 583     * Advertise this extension if either fragment color clamping is supported
 584     * or no render targets having color values outside of the range [0, 1]
 585     * are supported, in which case the fragment color clamping has no effect
 586     * on rendering.
 587     */
 588    if (screen->get_param(screen, PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL) ||
 589        (!screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 590                                      PIPE_TEXTURE_2D, 0,
 591                                      PIPE_BIND_RENDER_TARGET) &&
 592         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM,
 593                                      PIPE_TEXTURE_2D, 0,
 594                                      PIPE_BIND_RENDER_TARGET) &&
 595         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 596                                      PIPE_TEXTURE_2D, 0,
 597                                      PIPE_BIND_RENDER_TARGET) &&
 598         !screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 599                                      PIPE_TEXTURE_2D, 0,
 600                                      PIPE_BIND_RENDER_TARGET) &&
 601         !screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 602                                      PIPE_TEXTURE_2D, 0,
 603                                      PIPE_BIND_RENDER_TARGET) &&
 604         !screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 605                                      PIPE_TEXTURE_2D, 0,
 606                                      PIPE_BIND_RENDER_TARGET))) {
 607       ctx->Extensions.ARB_color_buffer_float = GL_TRUE;
 608    }
 609
 610    if (screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {
 611       ctx->Extensions.ARB_shader_stencil_export = GL_TRUE;
 612    }
 613
 614    if (screen->get_param(screen, PIPE_CAP_TGSI_INSTANCEID)) {
 615       ctx->Extensions.ARB_draw_instanced = GL_TRUE;
 616    }
 617    if (screen->get_param(screen, PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR)) {
 618       ctx->Extensions.ARB_instanced_arrays = GL_TRUE;
 619    }
 620
 621    if (screen->fence_finish) {
 622       ctx->Extensions.ARB_sync = GL_TRUE;
 623    }
 624
 625    if (st->pipe->texture_barrier) {
 626       ctx->Extensions.NV_texture_barrier = GL_TRUE;
 627    }
 628
 629    if (screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 630                                    PIPE_TEXTURE_2D, 0,
 631                                    PIPE_BIND_SAMPLER_VIEW)) {
 632       ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
 633    }
 634
 635    if (screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 636                                    PIPE_TEXTURE_2D, 0,
 637                                    PIPE_BIND_RENDER_TARGET |
 638                                    PIPE_BIND_SAMPLER_VIEW)) {
 639       ctx->Extensions.EXT_packed_float = GL_TRUE;
 640    }
 641
 642    /* Maximum sample count. */
 643    for (i = 16; i > 0; --i) {
 644       if (screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_UNORM,
 645                                       PIPE_TEXTURE_2D, i,
 646                                       PIPE_BIND_RENDER_TARGET)) {
 647          ctx->Const.MaxSamples = i;
 648          break;
 649       }
 650    }
 651
 652    if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE)) {
 653       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 654       ctx->Extensions.AMD_seamless_cubemap_per_texture = GL_TRUE;
 655    }
 656    else if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP)) {
 657       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 658    }
 659
 660    if (screen->get_param(screen, PIPE_CAP_SM3)) {
 661       ctx->Extensions.ARB_shader_texture_lod = GL_TRUE;
 662    }
 663
 664    if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT,
 665                                    PIPE_TEXTURE_2D, 0,
 666                                    PIPE_BIND_DEPTH_STENCIL |
 667                                    PIPE_BIND_SAMPLER_VIEW) &&
 668        screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT_S8X24_USCALED,
 669                                    PIPE_TEXTURE_2D, 0,
 670                                    PIPE_BIND_DEPTH_STENCIL |
 671                                    PIPE_BIND_SAMPLER_VIEW)) {
 672       ctx->Extensions.ARB_depth_buffer_float = GL_TRUE;
 673    }
 674 }