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    /* Define max viewport size and max renderbuffer size in terms of
 112     * max texture size (note: max tex RECT size = max tex 2D size).
 113     * If this isn't true for some hardware we'll need new PIPE_CAP_ queries.
 114     */
 115    c->MaxViewportWidth =
 116    c->MaxViewportHeight =
 117    c->MaxRenderbufferSize = c->MaxTextureRectSize;
 118
 119    c->MaxDrawBuffers
 120       = _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 121               1, MAX_DRAW_BUFFERS);
 122
 123    c->MaxLineWidth
 124       = _maxf(1.0f, screen->get_paramf(screen,
 125                                        PIPE_CAPF_MAX_LINE_WIDTH));
 126    c->MaxLineWidthAA
 127       = _maxf(1.0f, screen->get_paramf(screen,
 128                                        PIPE_CAPF_MAX_LINE_WIDTH_AA));
 129
 130    c->MaxPointSize
 131       = _maxf(1.0f, screen->get_paramf(screen,
 132                                        PIPE_CAPF_MAX_POINT_WIDTH));
 133    c->MaxPointSizeAA
 134       = _maxf(1.0f, screen->get_paramf(screen,
 135                                        PIPE_CAPF_MAX_POINT_WIDTH_AA));
 136    /* called after _mesa_create_context/_mesa_init_point, fix default user
 137     * settable max point size up
 138     */
 139    st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);
 140    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
 141     * for non-aa sizes, but we can go down to 0.0 for aa points.
 142     */
 143    c->MinPointSize = 1.0f;
 144    c->MinPointSizeAA = 0.0f;
 145
 146    c->MaxTextureMaxAnisotropy
 147       = _maxf(2.0f, screen->get_paramf(screen,
 148                                  PIPE_CAPF_MAX_TEXTURE_ANISOTROPY));
 149
 150    c->MaxTextureLodBias
 151       = screen->get_paramf(screen, PIPE_CAPF_MAX_TEXTURE_LOD_BIAS);
 152
 153    c->MaxDrawBuffers
 154       = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 155               1, MAX_DRAW_BUFFERS);
 156
 157    c->QuadsFollowProvokingVertexConvention = screen->get_param(
 158       screen, PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION);
 159
 160    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh) {
 161       struct gl_shader_compiler_options *options =
 162          &st->ctx->ShaderCompilerOptions[sh];
 163       struct gl_program_constants *pc;
 164
 165       switch (sh) {
 166       case PIPE_SHADER_FRAGMENT:
 167          pc = &c->FragmentProgram;
 168          break;
 169       case PIPE_SHADER_VERTEX:
 170          pc = &c->VertexProgram;
 171          break;
 172       case PIPE_SHADER_GEOMETRY:
 173          pc = &c->GeometryProgram;
 174          break;
 175       default:
 176          assert(0);
 177          continue;
 178       }
 179
 180       pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
 181       pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
 182       pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
 183       pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
 184       pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
 185       pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
 186       pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);
 187       pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);
 188       pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
 189       /* raise MaxParameters if native support is higher */
 190       pc->MaxParameters            = MAX2(pc->MaxParameters, pc->MaxNativeParameters);
 191
 192       /* Gallium doesn't really care about local vs. env parameters so use the
 193        * same limits.
 194        */
 195       pc->MaxLocalParams = MIN2(pc->MaxParameters, MAX_PROGRAM_LOCAL_PARAMS);
 196       pc->MaxEnvParams = MIN2(pc->MaxParameters, MAX_PROGRAM_ENV_PARAMS);
 197
 198       options->EmitNoNoise = TRUE;
 199
 200       /* TODO: make these more fine-grained if anyone needs it */
 201       options->MaxIfDepth = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 202       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 203       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 204       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 205
 206       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 207
 208       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
 209                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 210       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
 211                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 212       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
 213                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 214       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
 215                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 216
 217       if (options->EmitNoLoops)
 218          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
 219       else
 220          options->MaxUnrollIterations = 255; /* SM3 limit */
 221    }
 222
 223    /* PIPE_SHADER_CAP_MAX_INPUTS for the FS specifies the maximum number
 224     * of inputs. It's always 2 colors + N generic inputs. */
 225    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 226                                             PIPE_SHADER_CAP_MAX_INPUTS);
 227    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 228
 229    c->MinProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
 230    c->MaxProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
 231
 232    c->UniformBooleanTrue = ~0;
 233
 234    c->MaxTransformFeedbackSeparateAttribs =
 235       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS);
 236    c->MaxTransformFeedbackSeparateComponents =
 237       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS);
 238    c->MaxTransformFeedbackInterleavedComponents =
 239       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS);
 240
 241    c->StripTextureBorder = GL_TRUE;
 242
 243    c->GLSLSkipStrictMaxUniformLimitCheck =
 244       screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS);
 245
 246    c->GLSLSkipStrictMaxVaryingLimitCheck =
 247       screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_VARYINGS);
 248 }
 249
 250
 251 static GLboolean st_get_s3tc_override(void)
 252 {
 253    const char *override = _mesa_getenv("force_s3tc_enable");
 254    if (override && !strcmp(override, "true"))
 255       return GL_TRUE;
 256    return GL_FALSE;
 257 }
 258
 259 /**
 260  * Given a member \c x of struct gl_extensions, return offset of
 261  * \c x in bytes.
 262  */
 263 #define o(x) offsetof(struct gl_extensions, x)
 264
 265
 266 struct st_extension_cap_mapping {
 267    int extension_offset;
 268    int cap;
 269 };
 270
 271 struct st_extension_format_mapping {
 272    int extension_offset[2];
 273    enum pipe_format format[8];
 274
 275    /* If TRUE, at least one format must be supported for the extensions to be
 276     * advertised. If FALSE, all the formats must be supported. */
 277    GLboolean need_at_least_one;
 278 };
 279
 280 /**
 281  * Enable extensions if certain pipe formats are supported by the driver.
 282  * What extensions will be enabled and what formats must be supported is
 283  * described by the array of st_extension_format_mapping.
 284  *
 285  * target and bind_flags are passed to is_format_supported.
 286  */
 287 static void init_format_extensions(struct st_context *st,
 288                            const struct st_extension_format_mapping *mapping,
 289                            unsigned num_mappings,
 290                            enum pipe_texture_target target,
 291                            unsigned bind_flags)
 292 {
 293    struct pipe_screen *screen = st->pipe->screen;
 294    GLboolean *extensions = (GLboolean *) &st->ctx->Extensions;
 295    int i, j;
 296    int num_formats = Elements(mapping->format);
 297    int num_ext = Elements(mapping->extension_offset);
 298
 299    for (i = 0; i < num_mappings; i++) {
 300       int num_supported = 0;
 301
 302       /* Examine each format in the list. */
 303       for (j = 0; j < num_formats && mapping[i].format[j]; j++) {
 304          if (screen->is_format_supported(screen, mapping[i].format[j],
 305                                          target, 0, bind_flags)) {
 306             num_supported++;
 307          }
 308       }
 309
 310       if (!num_supported ||
 311           (!mapping[i].need_at_least_one && num_supported != j)) {
 312          continue;
 313       }
 314
 315       /* Enable all extensions in the list. */
 316       for (j = 0; j < num_ext && mapping[i].extension_offset[j]; j++)
 317          extensions[mapping[i].extension_offset[j]] = GL_TRUE;
 318    }
 319 }
 320
 321 /**
 322  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
 323  * which GL extensions are supported.
 324  * Quite a few extensions are always supported because they are standard
 325  * features or can be built on top of other gallium features.
 326  * Some fine tuning may still be needed.
 327  */
 328 void st_init_extensions(struct st_context *st)
 329 {
 330    struct pipe_screen *screen = st->pipe->screen;
 331    struct gl_context *ctx = st->ctx;
 332    int i, glsl_feature_level;
 333    GLboolean *extensions = (GLboolean *) &ctx->Extensions;
 334
 335    static const struct st_extension_cap_mapping cap_mapping[] = {
 336       { o(ARB_depth_clamp),                  PIPE_CAP_DEPTH_CLIP_DISABLE               },
 337       { o(ARB_depth_texture),                PIPE_CAP_TEXTURE_SHADOW_MAP               },
 338       { o(ARB_draw_buffers_blend),           PIPE_CAP_INDEP_BLEND_FUNC                 },
 339       { o(ARB_draw_instanced),               PIPE_CAP_TGSI_INSTANCEID                  },
 340       { o(ARB_fragment_program_shadow),      PIPE_CAP_TEXTURE_SHADOW_MAP               },
 341       { o(ARB_instanced_arrays),             PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR  },
 342       { o(ARB_occlusion_query),              PIPE_CAP_OCCLUSION_QUERY                  },
 343       { o(ARB_occlusion_query2),             PIPE_CAP_OCCLUSION_QUERY                  },
 344       { o(ARB_point_sprite),                 PIPE_CAP_POINT_SPRITE                     },
 345       { o(ARB_seamless_cube_map),            PIPE_CAP_SEAMLESS_CUBE_MAP                },
 346       { o(ARB_shader_stencil_export),        PIPE_CAP_SHADER_STENCIL_EXPORT            },
 347       { o(ARB_shader_texture_lod),           PIPE_CAP_SM3                              },
 348       { o(ARB_shadow),                       PIPE_CAP_TEXTURE_SHADOW_MAP               },
 349       { o(ARB_texture_non_power_of_two),     PIPE_CAP_NPOT_TEXTURES                    },
 350       { o(ARB_transform_feedback2),          PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME       },
 351
 352       { o(EXT_blend_equation_separate),      PIPE_CAP_BLEND_EQUATION_SEPARATE          },
 353       { o(EXT_draw_buffers2),                PIPE_CAP_INDEP_BLEND_ENABLE               },
 354       { o(EXT_shadow_funcs),                 PIPE_CAP_TEXTURE_SHADOW_MAP               },
 355       { o(EXT_stencil_two_side),             PIPE_CAP_TWO_SIDED_STENCIL                },
 356       { o(EXT_texture_array),                PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS         },
 357       { o(EXT_texture_filter_anisotropic),   PIPE_CAP_ANISOTROPIC_FILTER               },
 358       { o(EXT_texture_mirror_clamp),         PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
 359       { o(EXT_texture_swizzle),              PIPE_CAP_TEXTURE_SWIZZLE                  },
 360       { o(EXT_timer_query),                  PIPE_CAP_TIMER_QUERY                      },
 361       { o(EXT_transform_feedback),           PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS        },
 362
 363       { o(AMD_seamless_cubemap_per_texture), PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE    },
 364       { o(ATI_separate_stencil),             PIPE_CAP_TWO_SIDED_STENCIL                },
 365       { o(ATI_texture_mirror_once),          PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
 366       { o(NV_conditional_render),            PIPE_CAP_CONDITIONAL_RENDER               },
 367       { o(NV_texture_barrier),               PIPE_CAP_TEXTURE_BARRIER                  },
 368       /* GL_NV_point_sprite is not supported by gallium because we don't
 369        * support the GL_POINT_SPRITE_R_MODE_NV option. */
 370       { o(MESA_texture_array),               PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS         },
 371    };
 372
 373    /* Required: render target and sampler support */
 374    static const struct st_extension_format_mapping rendertarget_mapping[] = {
 375       { { o(ARB_texture_float) },
 376         { PIPE_FORMAT_R32G32B32A32_FLOAT,
 377           PIPE_FORMAT_R16G16B16A16_FLOAT } },
 378
 379       { { o(ARB_texture_rgb10_a2ui) },
 380         { PIPE_FORMAT_B10G10R10A2_UINT } },
 381
 382       { { o(EXT_framebuffer_sRGB) },
 383         { PIPE_FORMAT_A8B8G8R8_SRGB,
 384           PIPE_FORMAT_B8G8R8A8_SRGB },
 385          GL_TRUE }, /* at least one format must be supported */
 386
 387       { { o(EXT_packed_float) },
 388         { PIPE_FORMAT_R11G11B10_FLOAT } },
 389
 390       { { o(EXT_texture_integer) },
 391         { PIPE_FORMAT_R32G32B32A32_UINT,
 392           PIPE_FORMAT_R32G32B32A32_SINT } },
 393    };
 394
 395    /* Required: depth stencil and sampler support */
 396    static const struct st_extension_format_mapping depthstencil_mapping[] = {
 397       { { o(ARB_depth_buffer_float) },
 398         { PIPE_FORMAT_Z32_FLOAT,
 399           PIPE_FORMAT_Z32_FLOAT_S8X24_UINT } },
 400
 401       { { o(ARB_framebuffer_object),
 402           o(EXT_packed_depth_stencil) },
 403         { PIPE_FORMAT_S8_UINT_Z24_UNORM,
 404           PIPE_FORMAT_Z24_UNORM_S8_UINT },
 405         GL_TRUE }, /* at least one format must be supported */
 406    };
 407
 408    /* Required: sampler support */
 409    static const struct st_extension_format_mapping texture_mapping[] = {
 410       { { o(ARB_texture_compression_rgtc) },
 411         { PIPE_FORMAT_RGTC1_UNORM,
 412           PIPE_FORMAT_RGTC1_SNORM,
 413           PIPE_FORMAT_RGTC2_UNORM,
 414           PIPE_FORMAT_RGTC2_SNORM } },
 415
 416       { { o(ARB_texture_rg) },
 417         { PIPE_FORMAT_R8G8_UNORM } },
 418
 419       { { o(EXT_texture_compression_latc) },
 420         { PIPE_FORMAT_LATC1_UNORM,
 421           PIPE_FORMAT_LATC1_SNORM,
 422           PIPE_FORMAT_LATC2_UNORM,
 423           PIPE_FORMAT_LATC2_SNORM } },
 424
 425       { { o(EXT_texture_compression_s3tc),
 426           o(S3_s3tc) },
 427         { PIPE_FORMAT_DXT1_RGB,
 428           PIPE_FORMAT_DXT1_RGBA,
 429           PIPE_FORMAT_DXT3_RGBA,
 430           PIPE_FORMAT_DXT5_RGBA } },
 431
 432       { { o(EXT_texture_shared_exponent) },
 433         { PIPE_FORMAT_R9G9B9E5_FLOAT } },
 434
 435       { { o(EXT_texture_snorm) },
 436         { PIPE_FORMAT_R8G8B8A8_SNORM } },
 437
 438       { { o(EXT_texture_sRGB),
 439           o(EXT_texture_sRGB_decode) },
 440         { PIPE_FORMAT_A8B8G8R8_SRGB,
 441           PIPE_FORMAT_B8G8R8A8_SRGB },
 442         GL_TRUE }, /* at least one format must be supported */
 443
 444       { { o(ATI_texture_compression_3dc) },
 445         { PIPE_FORMAT_LATC2_UNORM } },
 446
 447       { { o(MESA_ycbcr_texture) },
 448         { PIPE_FORMAT_UYVY,
 449           PIPE_FORMAT_YUYV },
 450         GL_TRUE }, /* at least one format must be supported */
 451
 452       { { o(OES_compressed_ETC1_RGB8_texture) },
 453         { PIPE_FORMAT_ETC1_RGB8 } },
 454    };
 455
 456    /* Required: vertex fetch support. */
 457    static const struct st_extension_format_mapping vertex_mapping[] = {
 458       { { o(ARB_ES2_compatibility) },
 459         { PIPE_FORMAT_R32G32B32A32_FIXED } },
 460
 461       { { o(ARB_half_float_vertex) },
 462         { PIPE_FORMAT_R16G16B16A16_FLOAT } },
 463
 464       { { o(ARB_vertex_type_2_10_10_10_rev) },
 465         { PIPE_FORMAT_R10G10B10A2_UNORM,
 466           PIPE_FORMAT_B10G10R10A2_UNORM,
 467           PIPE_FORMAT_R10G10B10A2_SNORM,
 468           PIPE_FORMAT_B10G10R10A2_SNORM,
 469           PIPE_FORMAT_R10G10B10A2_USCALED,
 470           PIPE_FORMAT_B10G10R10A2_USCALED,
 471           PIPE_FORMAT_R10G10B10A2_SSCALED,
 472           PIPE_FORMAT_B10G10R10A2_SSCALED } },
 473    };
 474
 475    /*
 476     * Extensions that are supported by all Gallium drivers:
 477     */
 478    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 479    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 480    ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
 481    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
 482    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 483    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 484    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 485    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 486    ctx->Extensions.ARB_sampler_objects = GL_TRUE;
 487    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 488    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 489    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
 490    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 491    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 492    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 493    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 494    ctx->Extensions.ARB_texture_storage = GL_TRUE;
 495    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 496    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 497    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 498    ctx->Extensions.ARB_window_pos = GL_TRUE;
 499
 500    ctx->Extensions.EXT_blend_color = GL_TRUE;
 501    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 502    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 503    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 504    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 505    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 506    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 507    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 508    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 509    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 510    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 511    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 512    ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
 513    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 514    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 515
 516    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 517
 518    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 519
 520    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 521
 522    ctx->Extensions.NV_blend_square = GL_TRUE;
 523    ctx->Extensions.NV_fog_distance = GL_TRUE;
 524    ctx->Extensions.NV_texgen_reflection = GL_TRUE;
 525    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 526    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 527 #if 0
 528    /* possibly could support the following two */
 529    ctx->Extensions.NV_vertex_program = GL_TRUE;
 530    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 531 #endif
 532
 533 #if FEATURE_OES_EGL_image
 534    ctx->Extensions.OES_EGL_image = GL_TRUE;
 535    if (ctx->API != API_OPENGL)
 536       ctx->Extensions.OES_EGL_image_external = GL_TRUE;
 537 #endif
 538 #if FEATURE_OES_draw_texture
 539    ctx->Extensions.OES_draw_texture = GL_TRUE;
 540 #endif
 541
 542    /* Expose the extensions which directly correspond to gallium caps. */
 543    for (i = 0; i < Elements(cap_mapping); i++) {
 544       if (screen->get_param(screen, cap_mapping[i].cap)) {
 545          extensions[cap_mapping[i].extension_offset] = GL_TRUE;
 546       }
 547    }
 548
 549    /* Expose the extensions which directly correspond to gallium formats. */
 550    init_format_extensions(st, rendertarget_mapping,
 551                           Elements(rendertarget_mapping), PIPE_TEXTURE_2D,
 552                           PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW);
 553    init_format_extensions(st, depthstencil_mapping,
 554                           Elements(depthstencil_mapping), PIPE_TEXTURE_2D,
 555                           PIPE_BIND_DEPTH_STENCIL | PIPE_BIND_SAMPLER_VIEW);
 556    init_format_extensions(st, texture_mapping, Elements(texture_mapping),
 557                           PIPE_TEXTURE_2D, PIPE_BIND_SAMPLER_VIEW);
 558    init_format_extensions(st, vertex_mapping, Elements(vertex_mapping),
 559                           PIPE_BUFFER, PIPE_BIND_VERTEX_BUFFER);
 560
 561    /* Figure out GLSL support. */
 562    glsl_feature_level = screen->get_param(screen, PIPE_CAP_GLSL_FEATURE_LEVEL);
 563
 564    if (glsl_feature_level >= 130) {
 565       ctx->Const.GLSLVersion = 130;
 566    } else {
 567       ctx->Const.GLSLVersion = 120;
 568    }
 569
 570    _mesa_override_glsl_version(st->ctx);
 571
 572    if (ctx->Const.GLSLVersion >= 130) {
 573       ctx->Const.NativeIntegers = GL_TRUE;
 574       ctx->Const.MaxClipPlanes = 8;
 575
 576       /* Extensions that only depend on GLSL 1.3. */
 577       ctx->Extensions.ARB_conservative_depth = GL_TRUE;
 578    } else {
 579       /* Optional integer support for GLSL 1.2. */
 580       if (screen->get_shader_param(screen, PIPE_SHADER_VERTEX,
 581                                    PIPE_SHADER_CAP_INTEGERS) &&
 582           screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 583                                    PIPE_SHADER_CAP_INTEGERS)) {
 584          ctx->Const.NativeIntegers = GL_TRUE;
 585       }
 586    }
 587
 588    /* Below are the cases which cannot be moved into tables easily. */
 589
 590    if (!ctx->Mesa_DXTn && !st_get_s3tc_override()) {
 591       ctx->Extensions.EXT_texture_compression_s3tc = GL_FALSE;
 592       ctx->Extensions.S3_s3tc = GL_FALSE;
 593    }
 594
 595    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY,
 596                                 PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
 597 #if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
 598       ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
 599 #endif
 600    }
 601
 602    ctx->Extensions.NV_primitive_restart = GL_TRUE;
 603    if (!screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
 604       st->sw_primitive_restart = GL_TRUE;
 605    }
 606
 607    if (screen->get_param(screen, PIPE_CAP_VERTEX_COLOR_UNCLAMPED)) {
 608       ctx->Extensions.ARB_color_buffer_float = GL_TRUE;
 609
 610       if (!screen->get_param(screen, PIPE_CAP_VERTEX_COLOR_CLAMPED)) {
 611          st->clamp_vert_color_in_shader = TRUE;
 612       }
 613
 614       if (!screen->get_param(screen, PIPE_CAP_FRAGMENT_COLOR_CLAMPED)) {
 615          st->clamp_frag_color_in_shader = TRUE;
 616       }
 617    }
 618
 619    if (screen->fence_finish) {
 620       ctx->Extensions.ARB_sync = GL_TRUE;
 621    }
 622
 623    /* Maximum sample count. */
 624    for (i = 16; i > 0; --i) {
 625       if (screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_UNORM,
 626                                       PIPE_TEXTURE_2D, i,
 627                                       PIPE_BIND_RENDER_TARGET)) {
 628          ctx->Const.MaxSamples = i;
 629          break;
 630       }
 631    }
 632 }