src/mesa/state_tracker/st_extensions.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * Copyright (c) 2008 VMware, Inc.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 #include "main/imports.h"
  30 #include "main/context.h"
  31 #include "main/macros.h"
  32 #include "main/mfeatures.h"
  33
  34 #include "pipe/p_context.h"
  35 #include "pipe/p_defines.h"
  36 #include "pipe/p_screen.h"
  37
  38 #include "st_context.h"
  39 #include "st_extensions.h"
  40
  41
  42 static int _min(int a, int b)
  43 {
  44    return (a < b) ? a : b;
  45 }
  46
  47 static float _maxf(float a, float b)
  48 {
  49    return (a > b) ? a : b;
  50 }
  51
  52 static int _clamp(int a, int min, int max)
  53 {
  54    if (a < min)
  55       return min;
  56    else if (a > max)
  57       return max;
  58    else
  59       return a;
  60 }
  61
  62
  63 /**
  64  * Query driver to get implementation limits.
  65  * Note that we have to limit/clamp against Mesa's internal limits too.
  66  */
  67 void st_init_limits(struct st_context *st)
  68 {
  69    struct pipe_screen *screen = st->pipe->screen;
  70    struct gl_constants *c = &st->ctx->Const;
  71    gl_shader_type sh;
  72
  73    c->MaxTextureLevels
  74       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),
  75             MAX_TEXTURE_LEVELS);
  76
  77    c->Max3DTextureLevels
  78       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_3D_LEVELS),
  79             MAX_3D_TEXTURE_LEVELS);
  80
  81    c->MaxCubeTextureLevels
  82       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS),
  83             MAX_CUBE_TEXTURE_LEVELS);
  84
  85    c->MaxTextureRectSize
  86       = _min(1 << (c->MaxTextureLevels - 1), MAX_TEXTURE_RECT_SIZE);
  87
  88    c->MaxTextureImageUnits
  89       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS),
  90             MAX_TEXTURE_IMAGE_UNITS);
  91
  92    c->MaxVertexTextureImageUnits
  93       = _min(screen->get_param(screen, PIPE_CAP_MAX_VERTEX_TEXTURE_UNITS),
  94              MAX_VERTEX_TEXTURE_IMAGE_UNITS);
  95
  96    c->MaxCombinedTextureImageUnits
  97       = _min(screen->get_param(screen, PIPE_CAP_MAX_COMBINED_SAMPLERS),
  98              MAX_COMBINED_TEXTURE_IMAGE_UNITS);
  99
 100    c->MaxTextureCoordUnits
 101       = _min(c->MaxTextureImageUnits, MAX_TEXTURE_COORD_UNITS);
 102
 103    c->MaxTextureUnits = _min(c->MaxTextureImageUnits, c->MaxTextureCoordUnits);
 104
 105    c->MaxDrawBuffers
 106       = _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 107               1, MAX_DRAW_BUFFERS);
 108
 109    c->MaxLineWidth
 110       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH));
 111    c->MaxLineWidthAA
 112       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH_AA));
 113
 114    c->MaxPointSize
 115       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH));
 116    c->MaxPointSizeAA
 117       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH_AA));
 118    /* called after _mesa_create_context/_mesa_init_point, fix default user
 119     * settable max point size up
 120     */
 121    st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);
 122    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
 123     * for non-aa sizes, but we can go down to 0.0 for aa points.
 124     */
 125    c->MinPointSize = 1.0f;
 126    c->MinPointSizeAA = 0.0f;
 127
 128    c->MaxTextureMaxAnisotropy
 129       = _maxf(2.0f, screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_ANISOTROPY));
 130
 131    c->MaxTextureLodBias
 132       = screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_LOD_BIAS);
 133
 134    c->MaxDrawBuffers
 135       = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 136               1, MAX_DRAW_BUFFERS);
 137
 138    /* Quads always follow GL provoking rules. */
 139    c->QuadsFollowProvokingVertexConvention = GL_FALSE;
 140
 141    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh) {
 142       struct gl_shader_compiler_options *options =
 143          &st->ctx->ShaderCompilerOptions[sh];
 144       struct gl_program_constants *pc;
 145
 146       switch (sh) {
 147       case PIPE_SHADER_FRAGMENT:
 148          pc = &c->FragmentProgram;
 149          break;
 150       case PIPE_SHADER_VERTEX:
 151          pc = &c->VertexProgram;
 152          break;
 153       case PIPE_SHADER_GEOMETRY:
 154          pc = &c->GeometryProgram;
 155          break;
 156       default:
 157          assert(0);
 158          continue;
 159       }
 160
 161       pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
 162       pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
 163       pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
 164       pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
 165       pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
 166       pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
 167       pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);
 168       pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);
 169       pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
 170       /* raise MaxParameters if native support is higher */
 171       pc->MaxParameters            = MAX2(pc->MaxParameters, pc->MaxNativeParameters);
 172
 173       options->EmitNoNoise = TRUE;
 174
 175       /* TODO: make these more fine-grained if anyone needs it */
 176       options->MaxIfDepth = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 177       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 178       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 179       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 180
 181       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 182
 183       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
 184                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 185       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
 186                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 187       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
 188                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 189       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
 190                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 191
 192       if (options->EmitNoLoops)
 193          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
 194    }
 195
 196    /* PIPE_CAP_MAX_FS_INPUTS specifies the number of COLORn + GENERICn inputs
 197     * and is set in MaxNativeAttribs. It's always 2 colors + N generic
 198     * attributes. The GLSL compiler never uses COLORn for varyings, so we
 199     * subtract the 2 colors to get the maximum number of varyings (generic
 200     * attributes) supported by a driver. */
 201    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_MAX_INPUTS) - 2;
 202    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 203
 204    /* XXX we'll need a better query here someday */
 205    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
 206       c->MinProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
 207       c->MaxProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
 208
 209       c->GLSLVersion = 120;
 210    }
 211 }
 212
 213
 214 static GLboolean st_get_s3tc_override(void)
 215 {
 216    const char *override = _mesa_getenv("force_s3tc_enable");
 217    if (override && !strcmp(override, "true"))
 218       return GL_TRUE;
 219    return GL_FALSE;
 220 }
 221
 222
 223 /**
 224  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
 225  * which GL extensions are supported.
 226  * Quite a few extensions are always supported because they are standard
 227  * features or can be built on top of other gallium features.
 228  * Some fine tuning may still be needed.
 229  */
 230 void st_init_extensions(struct st_context *st)
 231 {
 232    struct pipe_screen *screen = st->pipe->screen;
 233    struct gl_context *ctx = st->ctx;
 234    int i;
 235
 236    /*
 237     * Extensions that are supported by all Gallium drivers:
 238     */
 239    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 240    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 241    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
 242    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 243    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 244    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 245    ctx->Extensions.ARB_multisample = GL_TRUE;
 246    ctx->Extensions.ARB_sampler_objects = GL_TRUE;
 247    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
 248    ctx->Extensions.ARB_texture_compression = GL_TRUE;
 249    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 250    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 251    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 252    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 253    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 254    ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
 255    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 256    ctx->Extensions.ARB_window_pos = GL_TRUE;
 257
 258    ctx->Extensions.EXT_blend_color = GL_TRUE;
 259    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 260    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 261    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 262    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 263    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 264    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 265    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 266    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 267    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 268    ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
 269    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 270    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 271    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 272    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 273    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 274    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 275    ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
 276    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 277    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 278    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 279    if (ctx->API == API_OPENGLES || ctx->API == API_OPENGLES2)
 280            ctx->Extensions.EXT_texture_format_BGRA8888 = GL_TRUE;
 281
 282    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 283
 284    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 285
 286    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 287
 288    ctx->Extensions.NV_blend_square = GL_TRUE;
 289    ctx->Extensions.NV_texgen_reflection = GL_TRUE;
 290    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 291    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 292 #if 0
 293    /* possibly could support the following two */
 294    ctx->Extensions.NV_vertex_program = GL_TRUE;
 295    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 296 #endif
 297
 298 #if FEATURE_OES_EGL_image
 299    ctx->Extensions.OES_EGL_image = GL_TRUE;
 300 #endif
 301 #if FEATURE_OES_draw_texture
 302    ctx->Extensions.OES_draw_texture = GL_TRUE;
 303 #endif
 304
 305    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 306
 307    /*
 308     * Extensions that depend on the driver/hardware:
 309     */
 310    if (screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS) > 0) {
 311       ctx->Extensions.ARB_draw_buffers = GL_TRUE;
 312    }
 313
 314    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SWIZZLE) > 0) {
 315       ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 316    }
 317
 318    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
 319       ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 320       ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 321       ctx->Extensions.ARB_shader_objects = GL_TRUE;
 322       ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 323       ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
 324       ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
 325    }
 326
 327    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_REPEAT) > 0) {
 328       ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 329    }
 330
 331    if (screen->get_param(screen, PIPE_CAP_BLEND_EQUATION_SEPARATE)) {
 332       ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 333    }
 334
 335    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_CLAMP) > 0) {
 336       ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 337       ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 338    }
 339
 340    if (screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES)) {
 341       ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 342    }
 343
 344    if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS) > 1) {
 345       ctx->Extensions.ARB_multitexture = GL_TRUE;
 346    }
 347
 348    if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {
 349       ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 350       ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 351    }
 352
 353    if (screen->get_param(screen, PIPE_CAP_ANISOTROPIC_FILTER)) {
 354       ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
 355    }
 356
 357    if (screen->get_param(screen, PIPE_CAP_POINT_SPRITE)) {
 358       ctx->Extensions.ARB_point_sprite = GL_TRUE;
 359       /* GL_NV_point_sprite is not supported by gallium because we don't
 360        * support the GL_POINT_SPRITE_R_MODE_NV option.
 361        */
 362    }
 363
 364    if (screen->get_param(screen, PIPE_CAP_OCCLUSION_QUERY)) {
 365       ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 366       ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
 367    }
 368    if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY)) {
 369      ctx->Extensions.EXT_timer_query = GL_TRUE;
 370    }
 371
 372    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SHADOW_MAP)) {
 373       ctx->Extensions.ARB_depth_texture = GL_TRUE;
 374       ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 375       ctx->Extensions.ARB_shadow = GL_TRUE;
 376       ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 377       /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/
 378    }
 379
 380    /* GL_EXT_packed_depth_stencil requires both the ability to render to
 381     * a depth/stencil buffer and texture from depth/stencil source.
 382     */
 383    if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 384                                    PIPE_TEXTURE_2D, 0,
 385                                    PIPE_BIND_DEPTH_STENCIL) &&
 386        screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 387                                    PIPE_TEXTURE_2D, 0,
 388                                    PIPE_BIND_SAMPLER_VIEW)) {
 389       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 390    }
 391    else if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 392                                         PIPE_TEXTURE_2D, 0,
 393                                         PIPE_BIND_DEPTH_STENCIL) &&
 394             screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 395                                         PIPE_TEXTURE_2D, 0,
 396                                         PIPE_BIND_SAMPLER_VIEW)) {
 397       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 398    }
 399
 400    /* float support - assume nothing exclusively supports 64-bit floats */
 401    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 402                                    PIPE_TEXTURE_2D, 0,
 403                                    PIPE_BIND_SAMPLER_VIEW |
 404                                    PIPE_BIND_RENDER_TARGET) &&
 405       screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 406                                    PIPE_TEXTURE_2D, 0,
 407                                    PIPE_BIND_SAMPLER_VIEW |
 408                                    PIPE_BIND_RENDER_TARGET)) {
 409       ctx->Extensions.ARB_texture_float = GL_TRUE;
 410    }
 411
 412    /* sRGB support */
 413    if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 414                                    PIPE_TEXTURE_2D, 0,
 415                                    PIPE_BIND_SAMPLER_VIEW) ||
 416       screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 417                                    PIPE_TEXTURE_2D, 0,
 418                                    PIPE_BIND_SAMPLER_VIEW)) {
 419       ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 420       ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
 421       if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 422                                    PIPE_TEXTURE_2D, 0,
 423                                    PIPE_BIND_RENDER_TARGET) ||
 424           screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 425                                    PIPE_TEXTURE_2D, 0,
 426                                    PIPE_BIND_RENDER_TARGET)) {
 427          ctx->Extensions.EXT_framebuffer_sRGB = GL_TRUE;
 428          ctx->Const.sRGBCapable = GL_TRUE;
 429       }
 430    }
 431
 432    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM,
 433                                    PIPE_TEXTURE_2D, 0,
 434                                    PIPE_BIND_SAMPLER_VIEW)) {
 435       ctx->Extensions.ARB_texture_rg = GL_TRUE;
 436    }
 437
 438    /* s3tc support */
 439    if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 440                                    PIPE_TEXTURE_2D, 0,
 441                                    PIPE_BIND_SAMPLER_VIEW) &&
 442        (ctx->Mesa_DXTn || st_get_s3tc_override())) {
 443       ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
 444       ctx->Extensions.S3_s3tc = GL_TRUE;
 445    }
 446
 447    if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM,
 448                                    PIPE_TEXTURE_2D, 0,
 449                                    PIPE_BIND_SAMPLER_VIEW) &&
 450        screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM,
 451                                    PIPE_TEXTURE_2D, 0,
 452                                    PIPE_BIND_SAMPLER_VIEW) &&
 453        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM,
 454                                    PIPE_TEXTURE_2D, 0,
 455                                    PIPE_BIND_SAMPLER_VIEW) &&
 456        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM,
 457                                    PIPE_TEXTURE_2D, 0,
 458                                    PIPE_BIND_SAMPLER_VIEW)
 459        ) {
 460      ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
 461    }
 462
 463    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_UNORM,
 464                                    PIPE_TEXTURE_2D, 0,
 465                                    PIPE_BIND_SAMPLER_VIEW) &&
 466        screen->is_format_supported(screen, PIPE_FORMAT_LATC1_SNORM,
 467                                    PIPE_TEXTURE_2D, 0,
 468                                    PIPE_BIND_SAMPLER_VIEW) &&
 469        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 470                                    PIPE_TEXTURE_2D, 0,
 471                                    PIPE_BIND_SAMPLER_VIEW) &&
 472        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_SNORM,
 473                                    PIPE_TEXTURE_2D, 0,
 474                                    PIPE_BIND_SAMPLER_VIEW)) {
 475       ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
 476    }
 477
 478    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 479                                    PIPE_TEXTURE_2D, 0,
 480                                    PIPE_BIND_SAMPLER_VIEW)) {
 481       ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
 482    }
 483
 484    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 485                                    PIPE_TEXTURE_2D, 0,
 486                                    PIPE_BIND_SAMPLER_VIEW)) {
 487       ctx->Extensions.EXT_texture_snorm = GL_TRUE;
 488    }
 489
 490    /* ycbcr support */
 491    if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 492                                    PIPE_TEXTURE_2D, 0,
 493                                    PIPE_BIND_SAMPLER_VIEW) ||
 494        screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 495                                    PIPE_TEXTURE_2D, 0,
 496                                    PIPE_BIND_SAMPLER_VIEW)) {
 497       ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 498    }
 499
 500    /* GL_EXT_texture_array */
 501    if (screen->get_param(screen, PIPE_CAP_ARRAY_TEXTURES)) {
 502       ctx->Extensions.EXT_texture_array = GL_TRUE;
 503       ctx->Extensions.MESA_texture_array = GL_TRUE;
 504    }
 505
 506    /* GL_ARB_framebuffer_object */
 507    if (ctx->Extensions.EXT_packed_depth_stencil) {
 508       /* we support always support GL_EXT_framebuffer_blit */
 509       ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 510    }
 511
 512    if (st->pipe->render_condition) {
 513       ctx->Extensions.NV_conditional_render = GL_TRUE;
 514    }
 515
 516    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_ENABLE)) {
 517       ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
 518    }
 519
 520    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC)) {
 521       ctx->Extensions.ARB_draw_buffers_blend = GL_TRUE;
 522    }
 523
 524    /* GL_ARB_half_float_vertex */
 525    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 526                                    PIPE_BUFFER, 0,
 527                                    PIPE_BIND_VERTEX_BUFFER)) {
 528       ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
 529    }
 530
 531    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FIXED,
 532                                    PIPE_BUFFER, 0,
 533                                    PIPE_BIND_VERTEX_BUFFER)) {
 534       ctx->Extensions.ARB_ES2_compatibility = GL_TRUE;
 535    }
 536
 537    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY, PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
 538 #if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
 539       ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
 540 #endif
 541    }
 542
 543    if (screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
 544       ctx->Extensions.NV_primitive_restart = GL_TRUE;
 545    }
 546
 547    if (screen->get_param(screen, PIPE_CAP_DEPTH_CLAMP)) {
 548       ctx->Extensions.ARB_depth_clamp = GL_TRUE;
 549    }
 550
 551    /* This extension does not actually require support of floating point
 552     * render targets, just clamping controls.
 553     * Advertise this extension if either fragment color clamping is supported
 554     * or no render targets having color values outside of the range [0, 1]
 555     * are supported, in which case the fragment color clamping has no effect
 556     * on rendering.
 557     */
 558    if (screen->get_param(screen, PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL) ||
 559        (!screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 560                                      PIPE_TEXTURE_2D, 0,
 561                                      PIPE_BIND_RENDER_TARGET) &&
 562         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM,
 563                                      PIPE_TEXTURE_2D, 0,
 564                                      PIPE_BIND_RENDER_TARGET) &&
 565         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 566                                      PIPE_TEXTURE_2D, 0,
 567                                      PIPE_BIND_RENDER_TARGET) &&
 568         !screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 569                                      PIPE_TEXTURE_2D, 0,
 570                                      PIPE_BIND_RENDER_TARGET) &&
 571         !screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 572                                      PIPE_TEXTURE_2D, 0,
 573                                      PIPE_BIND_RENDER_TARGET) &&
 574         !screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 575                                      PIPE_TEXTURE_2D, 0,
 576                                      PIPE_BIND_RENDER_TARGET))) {
 577       ctx->Extensions.ARB_color_buffer_float = GL_TRUE;
 578    }
 579
 580    if (screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {
 581       ctx->Extensions.ARB_shader_stencil_export = GL_TRUE;
 582    }
 583
 584    if (screen->get_param(screen, PIPE_CAP_TGSI_INSTANCEID)) {
 585       ctx->Extensions.ARB_draw_instanced = GL_TRUE;
 586    }
 587    if (screen->get_param(screen, PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR)) {
 588       ctx->Extensions.ARB_instanced_arrays = GL_TRUE;
 589    }
 590
 591    if (screen->fence_finish) {
 592       ctx->Extensions.ARB_sync = GL_TRUE;
 593    }
 594
 595    if (st->pipe->texture_barrier) {
 596       ctx->Extensions.NV_texture_barrier = GL_TRUE;
 597    }
 598
 599    if (screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 600                                    PIPE_TEXTURE_2D, 0,
 601                                    PIPE_BIND_SAMPLER_VIEW)) {
 602       ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
 603    }
 604
 605    if (screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 606                                    PIPE_TEXTURE_2D, 0,
 607                                    PIPE_BIND_RENDER_TARGET |
 608                                    PIPE_BIND_SAMPLER_VIEW)) {
 609       ctx->Extensions.EXT_packed_float = GL_TRUE;
 610    }
 611
 612    /* Maximum sample count. */
 613    for (i = 16; i > 0; --i) {
 614       if (screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_UNORM,
 615                                       PIPE_TEXTURE_2D, i,
 616                                       PIPE_BIND_RENDER_TARGET)) {
 617          ctx->Const.MaxSamples = i;
 618          break;
 619       }
 620    }
 621
 622    if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE)) {
 623       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 624       ctx->Extensions.AMD_seamless_cubemap_per_texture = GL_TRUE;
 625    }
 626    else if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP)) {
 627       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 628    }
 629
 630    if (screen->get_param(screen, PIPE_CAP_SM3)) {
 631       ctx->Extensions.ARB_shader_texture_lod = GL_TRUE;
 632    }
 633
 634    if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT,
 635                                    PIPE_TEXTURE_2D, 0,
 636                                    PIPE_BIND_DEPTH_STENCIL |
 637                                    PIPE_BIND_SAMPLER_VIEW) &&
 638        screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT_S8X24_USCALED,
 639                                    PIPE_TEXTURE_2D, 0,
 640                                    PIPE_BIND_DEPTH_STENCIL |
 641                                    PIPE_BIND_SAMPLER_VIEW)) {
 642       ctx->Extensions.ARB_depth_buffer_float = GL_TRUE;
 643    }
 644 }