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,
 117                                        PIPE_CAPF_MAX_LINE_WIDTH));
 118    c->MaxLineWidthAA
 119       = _maxf(1.0f, screen->get_paramf(screen,
 120                                        PIPE_CAPF_MAX_LINE_WIDTH_AA));
 121
 122    c->MaxPointSize
 123       = _maxf(1.0f, screen->get_paramf(screen,
 124                                        PIPE_CAPF_MAX_POINT_WIDTH));
 125    c->MaxPointSizeAA
 126       = _maxf(1.0f, screen->get_paramf(screen,
 127                                        PIPE_CAPF_MAX_POINT_WIDTH_AA));
 128    /* called after _mesa_create_context/_mesa_init_point, fix default user
 129     * settable max point size up
 130     */
 131    st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);
 132    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
 133     * for non-aa sizes, but we can go down to 0.0 for aa points.
 134     */
 135    c->MinPointSize = 1.0f;
 136    c->MinPointSizeAA = 0.0f;
 137
 138    c->MaxTextureMaxAnisotropy
 139       = _maxf(2.0f, screen->get_paramf(screen,
 140                                  PIPE_CAPF_MAX_TEXTURE_ANISOTROPY));
 141
 142    c->MaxTextureLodBias
 143       = screen->get_paramf(screen, PIPE_CAPF_MAX_TEXTURE_LOD_BIAS);
 144
 145    c->MaxDrawBuffers
 146       = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 147               1, MAX_DRAW_BUFFERS);
 148
 149    /* Quads always follow GL provoking rules. */
 150    c->QuadsFollowProvokingVertexConvention = GL_FALSE;
 151
 152    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh) {
 153       struct gl_shader_compiler_options *options =
 154          &st->ctx->ShaderCompilerOptions[sh];
 155       struct gl_program_constants *pc;
 156
 157       switch (sh) {
 158       case PIPE_SHADER_FRAGMENT:
 159          pc = &c->FragmentProgram;
 160          break;
 161       case PIPE_SHADER_VERTEX:
 162          pc = &c->VertexProgram;
 163          break;
 164       case PIPE_SHADER_GEOMETRY:
 165          pc = &c->GeometryProgram;
 166          break;
 167       default:
 168          assert(0);
 169          continue;
 170       }
 171
 172       pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
 173       pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
 174       pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
 175       pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
 176       pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
 177       pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
 178       pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);
 179       pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);
 180       pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
 181       /* raise MaxParameters if native support is higher */
 182       pc->MaxParameters            = MAX2(pc->MaxParameters, pc->MaxNativeParameters);
 183
 184       /* Gallium doesn't really care about local vs. env parameters so use the
 185        * same limits.
 186        */
 187       pc->MaxLocalParams = MIN2(pc->MaxParameters, MAX_PROGRAM_LOCAL_PARAMS);
 188       pc->MaxEnvParams = MIN2(pc->MaxParameters, MAX_PROGRAM_ENV_PARAMS);
 189
 190       options->EmitNoNoise = TRUE;
 191
 192       /* TODO: make these more fine-grained if anyone needs it */
 193       options->MaxIfDepth = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 194       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 195       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 196       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 197
 198       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 199
 200       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
 201                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 202       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
 203                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 204       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
 205                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 206       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
 207                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 208
 209       if (options->EmitNoLoops)
 210          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
 211    }
 212
 213    /* PIPE_SHADER_CAP_MAX_INPUTS for the FS specifies the maximum number
 214     * of inputs. It's always 2 colors + N generic inputs. */
 215    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 216                                             PIPE_SHADER_CAP_MAX_INPUTS);
 217    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 218
 219    c->MinProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
 220    c->MaxProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
 221
 222    c->UniformBooleanTrue = ~0;
 223
 224    c->MaxTransformFeedbackSeparateAttribs =
 225       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS);
 226    c->MaxTransformFeedbackSeparateComponents =
 227       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS);
 228    c->MaxTransformFeedbackInterleavedComponents =
 229       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS);
 230
 231    c->StripTextureBorder = GL_TRUE;
 232
 233    c->GLSLSkipStrictMaxUniformLimitCheck =
 234       screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS);
 235
 236    c->GLSLSkipStrictMaxVaryingLimitCheck =
 237       screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_VARYINGS);
 238 }
 239
 240
 241 static GLboolean st_get_s3tc_override(void)
 242 {
 243    const char *override = _mesa_getenv("force_s3tc_enable");
 244    if (override && !strcmp(override, "true"))
 245       return GL_TRUE;
 246    return GL_FALSE;
 247 }
 248
 249
 250 /**
 251  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
 252  * which GL extensions are supported.
 253  * Quite a few extensions are always supported because they are standard
 254  * features or can be built on top of other gallium features.
 255  * Some fine tuning may still be needed.
 256  */
 257 void st_init_extensions(struct st_context *st)
 258 {
 259    struct pipe_screen *screen = st->pipe->screen;
 260    struct gl_context *ctx = st->ctx;
 261    int i;
 262
 263    ctx->Const.GLSLVersion = 120;
 264    _mesa_override_glsl_version(st->ctx);
 265
 266    /* Extensions that only depend on the GLSL version:
 267     */
 268    if (ctx->Const.GLSLVersion >= 130) {
 269       ctx->Extensions.ARB_conservative_depth = GL_TRUE;
 270    }
 271
 272    /*
 273     * Extensions that are supported by all Gallium drivers:
 274     */
 275    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 276    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 277    ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
 278    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
 279    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 280    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 281    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 282    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 283    ctx->Extensions.ARB_sampler_objects = GL_TRUE;
 284    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 285    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 286    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
 287    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 288    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 289    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 290    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 291    ctx->Extensions.ARB_texture_storage = GL_TRUE;
 292    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 293    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 294    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 295    ctx->Extensions.ARB_window_pos = GL_TRUE;
 296
 297    ctx->Extensions.EXT_blend_color = GL_TRUE;
 298    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 299    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 300    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 301    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 302    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 303    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 304    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 305    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 306    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 307    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 308    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 309    ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
 310    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 311    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 312
 313    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 314
 315    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 316
 317    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 318
 319    ctx->Extensions.NV_blend_square = GL_TRUE;
 320    ctx->Extensions.NV_fog_distance = GL_TRUE;
 321    ctx->Extensions.NV_texgen_reflection = GL_TRUE;
 322    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 323    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 324 #if 0
 325    /* possibly could support the following two */
 326    ctx->Extensions.NV_vertex_program = GL_TRUE;
 327    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 328 #endif
 329
 330 #if FEATURE_OES_EGL_image
 331    ctx->Extensions.OES_EGL_image = GL_TRUE;
 332    if (ctx->API != API_OPENGL)
 333       ctx->Extensions.OES_EGL_image_external = GL_TRUE;
 334 #endif
 335 #if FEATURE_OES_draw_texture
 336    ctx->Extensions.OES_draw_texture = GL_TRUE;
 337 #endif
 338
 339    /*
 340     * Extensions that depend on the driver/hardware:
 341     */
 342    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SWIZZLE) > 0) {
 343       ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 344    }
 345
 346    if (screen->get_param(screen, PIPE_CAP_BLEND_EQUATION_SEPARATE)) {
 347       ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 348    }
 349
 350    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_CLAMP) > 0) {
 351       ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 352       ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 353    }
 354
 355    if (screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES)) {
 356       ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 357    }
 358
 359    if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {
 360       ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 361       ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 362    }
 363
 364    if (screen->get_param(screen, PIPE_CAP_ANISOTROPIC_FILTER)) {
 365       ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
 366    }
 367
 368    if (screen->get_param(screen, PIPE_CAP_POINT_SPRITE)) {
 369       ctx->Extensions.ARB_point_sprite = GL_TRUE;
 370       /* GL_NV_point_sprite is not supported by gallium because we don't
 371        * support the GL_POINT_SPRITE_R_MODE_NV option.
 372        */
 373    }
 374
 375    if (screen->get_param(screen, PIPE_CAP_OCCLUSION_QUERY)) {
 376       ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 377       ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
 378    }
 379    if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY)) {
 380       ctx->Extensions.EXT_timer_query = GL_TRUE;
 381    }
 382
 383    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SHADOW_MAP)) {
 384       ctx->Extensions.ARB_depth_texture = GL_TRUE;
 385       ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 386       ctx->Extensions.ARB_shadow = GL_TRUE;
 387       ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 388       /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/
 389    }
 390
 391    /* GL_EXT_packed_depth_stencil requires both the ability to render to
 392     * a depth/stencil buffer and texture from depth/stencil source.
 393     */
 394    if (screen->is_format_supported(screen, PIPE_FORMAT_S8_UINT_Z24_UNORM,
 395                                    PIPE_TEXTURE_2D, 0,
 396                                    PIPE_BIND_DEPTH_STENCIL) &&
 397        screen->is_format_supported(screen, PIPE_FORMAT_S8_UINT_Z24_UNORM,
 398                                    PIPE_TEXTURE_2D, 0,
 399                                    PIPE_BIND_SAMPLER_VIEW)) {
 400       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 401    }
 402    else if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_UINT,
 403                                         PIPE_TEXTURE_2D, 0,
 404                                         PIPE_BIND_DEPTH_STENCIL) &&
 405             screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_UINT,
 406                                         PIPE_TEXTURE_2D, 0,
 407                                         PIPE_BIND_SAMPLER_VIEW)) {
 408       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 409    }
 410
 411    /* float support - assume nothing exclusively supports 64-bit floats */
 412    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 413                                    PIPE_TEXTURE_2D, 0,
 414                                    PIPE_BIND_SAMPLER_VIEW |
 415                                    PIPE_BIND_RENDER_TARGET) &&
 416       screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 417                                    PIPE_TEXTURE_2D, 0,
 418                                    PIPE_BIND_SAMPLER_VIEW |
 419                                    PIPE_BIND_RENDER_TARGET)) {
 420       ctx->Extensions.ARB_texture_float = GL_TRUE;
 421    }
 422
 423    /* sRGB support */
 424    if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 425                                    PIPE_TEXTURE_2D, 0,
 426                                    PIPE_BIND_SAMPLER_VIEW) ||
 427       screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 428                                    PIPE_TEXTURE_2D, 0,
 429                                    PIPE_BIND_SAMPLER_VIEW)) {
 430       ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 431       ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
 432       if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 433                                    PIPE_TEXTURE_2D, 0,
 434                                    PIPE_BIND_RENDER_TARGET) ||
 435           screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 436                                    PIPE_TEXTURE_2D, 0,
 437                                    PIPE_BIND_RENDER_TARGET)) {
 438          ctx->Extensions.EXT_framebuffer_sRGB = GL_TRUE;
 439          ctx->Const.sRGBCapable = GL_TRUE;
 440       }
 441    }
 442
 443    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM,
 444                                    PIPE_TEXTURE_2D, 0,
 445                                    PIPE_BIND_SAMPLER_VIEW)) {
 446       ctx->Extensions.ARB_texture_rg = GL_TRUE;
 447    }
 448
 449    /* s3tc support */
 450    if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 451                                    PIPE_TEXTURE_2D, 0,
 452                                    PIPE_BIND_SAMPLER_VIEW) &&
 453        (ctx->Mesa_DXTn || st_get_s3tc_override())) {
 454       ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
 455       ctx->Extensions.S3_s3tc = GL_TRUE;
 456    }
 457
 458    if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM,
 459                                    PIPE_TEXTURE_2D, 0,
 460                                    PIPE_BIND_SAMPLER_VIEW) &&
 461        screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM,
 462                                    PIPE_TEXTURE_2D, 0,
 463                                    PIPE_BIND_SAMPLER_VIEW) &&
 464        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM,
 465                                    PIPE_TEXTURE_2D, 0,
 466                                    PIPE_BIND_SAMPLER_VIEW) &&
 467        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM,
 468                                    PIPE_TEXTURE_2D, 0,
 469                                    PIPE_BIND_SAMPLER_VIEW)
 470        ) {
 471      ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
 472    }
 473
 474    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_UNORM,
 475                                    PIPE_TEXTURE_2D, 0,
 476                                    PIPE_BIND_SAMPLER_VIEW) &&
 477        screen->is_format_supported(screen, PIPE_FORMAT_LATC1_SNORM,
 478                                    PIPE_TEXTURE_2D, 0,
 479                                    PIPE_BIND_SAMPLER_VIEW) &&
 480        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 481                                    PIPE_TEXTURE_2D, 0,
 482                                    PIPE_BIND_SAMPLER_VIEW) &&
 483        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_SNORM,
 484                                    PIPE_TEXTURE_2D, 0,
 485                                    PIPE_BIND_SAMPLER_VIEW)) {
 486       ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
 487    }
 488
 489    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 490                                    PIPE_TEXTURE_2D, 0,
 491                                    PIPE_BIND_SAMPLER_VIEW)) {
 492       ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
 493    }
 494
 495    if (ctx->API != API_OPENGL) {
 496       if (screen->is_format_supported(screen, PIPE_FORMAT_ETC1_RGB8,
 497                                       PIPE_TEXTURE_2D, 0,
 498                                       PIPE_BIND_SAMPLER_VIEW)) {
 499          ctx->Extensions.OES_compressed_ETC1_RGB8_texture = GL_TRUE;
 500       }
 501    }
 502
 503    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 504                                    PIPE_TEXTURE_2D, 0,
 505                                    PIPE_BIND_SAMPLER_VIEW)) {
 506       ctx->Extensions.EXT_texture_snorm = GL_TRUE;
 507    }
 508
 509    /* ycbcr support */
 510    if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 511                                    PIPE_TEXTURE_2D, 0,
 512                                    PIPE_BIND_SAMPLER_VIEW) ||
 513        screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 514                                    PIPE_TEXTURE_2D, 0,
 515                                    PIPE_BIND_SAMPLER_VIEW)) {
 516       ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 517    }
 518
 519    /* GL_EXT_texture_array */
 520    if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS) > 1) {
 521       ctx->Extensions.EXT_texture_array = GL_TRUE;
 522       ctx->Extensions.MESA_texture_array = GL_TRUE;
 523    }
 524
 525    /* GL_ARB_framebuffer_object */
 526    if (ctx->Extensions.EXT_packed_depth_stencil) {
 527       /* we support always support GL_EXT_framebuffer_blit */
 528       ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 529    }
 530
 531    if (screen->get_param(screen, PIPE_CAP_CONDITIONAL_RENDER)) {
 532       ctx->Extensions.NV_conditional_render = GL_TRUE;
 533    }
 534
 535    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_ENABLE)) {
 536       ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
 537    }
 538
 539    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC)) {
 540       ctx->Extensions.ARB_draw_buffers_blend = GL_TRUE;
 541    }
 542
 543    /* GL_ARB_half_float_vertex */
 544    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 545                                    PIPE_BUFFER, 0,
 546                                    PIPE_BIND_VERTEX_BUFFER)) {
 547       ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
 548    }
 549
 550    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FIXED,
 551                                    PIPE_BUFFER, 0,
 552                                    PIPE_BIND_VERTEX_BUFFER)) {
 553       ctx->Extensions.ARB_ES2_compatibility = GL_TRUE;
 554    }
 555
 556    if (screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_UNORM,
 557                                    PIPE_BUFFER, 0,
 558                                    PIPE_BIND_VERTEX_BUFFER) &&
 559        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_UNORM,
 560                                    PIPE_BUFFER, 0,
 561                                    PIPE_BIND_VERTEX_BUFFER) &&
 562        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SNORM,
 563                                    PIPE_BUFFER, 0,
 564                                    PIPE_BIND_VERTEX_BUFFER) &&
 565        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SNORM,
 566                                    PIPE_BUFFER, 0,
 567                                    PIPE_BIND_VERTEX_BUFFER) &&
 568        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_USCALED,
 569                                    PIPE_BUFFER, 0,
 570                                    PIPE_BIND_VERTEX_BUFFER) &&
 571        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_USCALED,
 572                                    PIPE_BUFFER, 0,
 573                                    PIPE_BIND_VERTEX_BUFFER) &&
 574        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SSCALED,
 575                                    PIPE_BUFFER, 0,
 576                                    PIPE_BIND_VERTEX_BUFFER) &&
 577        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SSCALED,
 578                                    PIPE_BUFFER, 0,
 579                                    PIPE_BIND_VERTEX_BUFFER)) {
 580       ctx->Extensions.ARB_vertex_type_2_10_10_10_rev = GL_TRUE;
 581    }
 582
 583    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY,
 584                                 PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
 585 #if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
 586       ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
 587 #endif
 588    }
 589
 590    ctx->Extensions.NV_primitive_restart = GL_TRUE;
 591    if (!screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
 592       st->sw_primitive_restart = GL_TRUE;
 593    }
 594
 595    if (screen->get_param(screen, PIPE_CAP_DEPTH_CLAMP)) {
 596       ctx->Extensions.ARB_depth_clamp = GL_TRUE;
 597    }
 598
 599    /* This extension does not actually require support of floating point
 600     * render targets, just clamping controls.
 601     * Advertise this extension if either fragment color clamping is supported
 602     * or no render targets having color values outside of the range [0, 1]
 603     * are supported, in which case the fragment color clamping has no effect
 604     * on rendering.
 605     */
 606    if (screen->get_param(screen, PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL) ||
 607        (!screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 608                                      PIPE_TEXTURE_2D, 0,
 609                                      PIPE_BIND_RENDER_TARGET) &&
 610         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM,
 611                                      PIPE_TEXTURE_2D, 0,
 612                                      PIPE_BIND_RENDER_TARGET) &&
 613         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 614                                      PIPE_TEXTURE_2D, 0,
 615                                      PIPE_BIND_RENDER_TARGET) &&
 616         !screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 617                                      PIPE_TEXTURE_2D, 0,
 618                                      PIPE_BIND_RENDER_TARGET) &&
 619         !screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 620                                      PIPE_TEXTURE_2D, 0,
 621                                      PIPE_BIND_RENDER_TARGET) &&
 622         !screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 623                                      PIPE_TEXTURE_2D, 0,
 624                                      PIPE_BIND_RENDER_TARGET))) {
 625       ctx->Extensions.ARB_color_buffer_float = GL_TRUE;
 626    }
 627
 628    if (screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {
 629       ctx->Extensions.ARB_shader_stencil_export = GL_TRUE;
 630    }
 631
 632    if (screen->get_param(screen, PIPE_CAP_TGSI_INSTANCEID)) {
 633       ctx->Extensions.ARB_draw_instanced = GL_TRUE;
 634    }
 635    if (screen->get_param(screen, PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR)) {
 636       ctx->Extensions.ARB_instanced_arrays = GL_TRUE;
 637    }
 638
 639    if (screen->fence_finish) {
 640       ctx->Extensions.ARB_sync = GL_TRUE;
 641    }
 642
 643    if (screen->get_param(screen, PIPE_CAP_TEXTURE_BARRIER)) {
 644       ctx->Extensions.NV_texture_barrier = GL_TRUE;
 645    }
 646
 647    if (screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 648                                    PIPE_TEXTURE_2D, 0,
 649                                    PIPE_BIND_SAMPLER_VIEW)) {
 650       ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
 651    }
 652
 653    if (screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 654                                    PIPE_TEXTURE_2D, 0,
 655                                    PIPE_BIND_RENDER_TARGET |
 656                                    PIPE_BIND_SAMPLER_VIEW)) {
 657       ctx->Extensions.EXT_packed_float = GL_TRUE;
 658    }
 659
 660    /* Maximum sample count. */
 661    for (i = 16; i > 0; --i) {
 662       if (screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_UNORM,
 663                                       PIPE_TEXTURE_2D, i,
 664                                       PIPE_BIND_RENDER_TARGET)) {
 665          ctx->Const.MaxSamples = i;
 666          break;
 667       }
 668    }
 669
 670    if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE)) {
 671       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 672       ctx->Extensions.AMD_seamless_cubemap_per_texture = GL_TRUE;
 673    }
 674    else if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP)) {
 675       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 676    }
 677
 678    if (screen->get_param(screen, PIPE_CAP_SM3)) {
 679       ctx->Extensions.ARB_shader_texture_lod = GL_TRUE;
 680    }
 681
 682    if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT,
 683                                    PIPE_TEXTURE_2D, 0,
 684                                    PIPE_BIND_DEPTH_STENCIL |
 685                                    PIPE_BIND_SAMPLER_VIEW) &&
 686        screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT_S8X24_UINT,
 687                                    PIPE_TEXTURE_2D, 0,
 688                                    PIPE_BIND_DEPTH_STENCIL |
 689                                    PIPE_BIND_SAMPLER_VIEW)) {
 690       ctx->Extensions.ARB_depth_buffer_float = GL_TRUE;
 691    }
 692
 693    if (screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_UINT,
 694                                    PIPE_TEXTURE_2D, 0,
 695                                    PIPE_BIND_SAMPLER_VIEW))
 696        ctx->Extensions.ARB_texture_rgb10_a2ui = GL_TRUE;
 697
 698    if (screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS) != 0) {
 699       ctx->Extensions.EXT_transform_feedback = GL_TRUE;
 700
 701       if (screen->get_param(screen,
 702                             PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME) != 0) {
 703          ctx->Extensions.ARB_transform_feedback2 = GL_TRUE;
 704       }
 705    }
 706 }