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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2007 VMware, Inc.
  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 VMWARE 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/version.h"
  33.  
  34. #include "pipe/p_context.h"
  35. #include "pipe/p_defines.h"
  36. #include "pipe/p_screen.h"
  37. #include "util/u_math.h"
  38.  
  39. #include "st_context.h"
  40. #include "st_extensions.h"
  41. #include "st_format.h"
  42.  
  43.  
  44. /*
  45.  * Note: we use these function rather than the MIN2, MAX2, CLAMP macros to
  46.  * avoid evaluating arguments (which are often function calls) more than once.
  47.  */
  48.  
  49. static unsigned _min(unsigned a, unsigned b)
  50. {
  51.    return (a < b) ? a : b;
  52. }
  53.  
  54. static float _maxf(float a, float b)
  55. {
  56.    return (a > b) ? a : b;
  57. }
  58.  
  59. static int _clamp(int a, int min, int max)
  60. {
  61.    if (a < min)
  62.       return min;
  63.    else if (a > max)
  64.       return max;
  65.    else
  66.       return a;
  67. }
  68.  
  69.  
  70. /**
  71.  * Query driver to get implementation limits.
  72.  * Note that we have to limit/clamp against Mesa's internal limits too.
  73.  */
  74. void st_init_limits(struct pipe_screen *screen,
  75.                     struct gl_constants *c, struct gl_extensions *extensions)
  76. {
  77.    unsigned sh;
  78.    boolean can_ubo = TRUE;
  79.  
  80.    c->MaxTextureLevels
  81.       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),
  82.             MAX_TEXTURE_LEVELS);
  83.  
  84.    c->Max3DTextureLevels
  85.       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_3D_LEVELS),
  86.             MAX_3D_TEXTURE_LEVELS);
  87.  
  88.    c->MaxCubeTextureLevels
  89.       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS),
  90.             MAX_CUBE_TEXTURE_LEVELS);
  91.  
  92.    c->MaxTextureRectSize
  93.       = _min(1 << (c->MaxTextureLevels - 1), MAX_TEXTURE_RECT_SIZE);
  94.  
  95.    c->MaxArrayTextureLayers
  96.       = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS);
  97.  
  98.    /* Define max viewport size and max renderbuffer size in terms of
  99.     * max texture size (note: max tex RECT size = max tex 2D size).
  100.     * If this isn't true for some hardware we'll need new PIPE_CAP_ queries.
  101.     */
  102.    c->MaxViewportWidth =
  103.    c->MaxViewportHeight =
  104.    c->MaxRenderbufferSize = c->MaxTextureRectSize;
  105.  
  106.    c->MaxDrawBuffers = c->MaxColorAttachments =
  107.       _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
  108.              1, MAX_DRAW_BUFFERS);
  109.  
  110.    c->MaxDualSourceDrawBuffers
  111.       = _clamp(screen->get_param(screen, PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS),
  112.               0, MAX_DRAW_BUFFERS);
  113.  
  114.    c->MaxLineWidth
  115.       = _maxf(1.0f, screen->get_paramf(screen,
  116.                                        PIPE_CAPF_MAX_LINE_WIDTH));
  117.    c->MaxLineWidthAA
  118.       = _maxf(1.0f, screen->get_paramf(screen,
  119.                                        PIPE_CAPF_MAX_LINE_WIDTH_AA));
  120.  
  121.    c->MaxPointSize
  122.       = _maxf(1.0f, screen->get_paramf(screen,
  123.                                        PIPE_CAPF_MAX_POINT_WIDTH));
  124.    c->MaxPointSizeAA
  125.       = _maxf(1.0f, screen->get_paramf(screen,
  126.                                        PIPE_CAPF_MAX_POINT_WIDTH_AA));
  127.  
  128.    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
  129.     * for non-aa sizes, but we can go down to 0.0 for aa points.
  130.     */
  131.    c->MinPointSize = 1.0f;
  132.    c->MinPointSizeAA = 0.0f;
  133.  
  134.    c->MaxTextureMaxAnisotropy
  135.       = _maxf(2.0f, screen->get_paramf(screen,
  136.                                  PIPE_CAPF_MAX_TEXTURE_ANISOTROPY));
  137.  
  138.    c->MaxTextureLodBias
  139.       = screen->get_paramf(screen, PIPE_CAPF_MAX_TEXTURE_LOD_BIAS);
  140.  
  141.    c->QuadsFollowProvokingVertexConvention = screen->get_param(
  142.       screen, PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION);
  143.  
  144.    c->MaxUniformBlockSize =
  145.       screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
  146.                                PIPE_SHADER_CAP_MAX_CONST_BUFFER_SIZE);
  147.    if (c->MaxUniformBlockSize < 16384) {
  148.       can_ubo = FALSE;
  149.    }
  150.  
  151.    for (sh = 0; sh < PIPE_SHADER_TYPES; ++sh) {
  152.       struct gl_shader_compiler_options *options;
  153.       struct gl_program_constants *pc;
  154.  
  155.       switch (sh) {
  156.       case PIPE_SHADER_FRAGMENT:
  157.          pc = &c->Program[MESA_SHADER_FRAGMENT];
  158.          options = &c->ShaderCompilerOptions[MESA_SHADER_FRAGMENT];
  159.          break;
  160.       case PIPE_SHADER_VERTEX:
  161.          pc = &c->Program[MESA_SHADER_VERTEX];
  162.          options = &c->ShaderCompilerOptions[MESA_SHADER_VERTEX];
  163.          break;
  164.       case PIPE_SHADER_GEOMETRY:
  165.          pc = &c->Program[MESA_SHADER_GEOMETRY];
  166.          options = &c->ShaderCompilerOptions[MESA_SHADER_GEOMETRY];
  167.          break;
  168.       default:
  169.          /* compute shader, etc. */
  170.          continue;
  171.       }
  172.  
  173.       pc->MaxTextureImageUnits =
  174.          _min(screen->get_shader_param(screen, sh,
  175.                                        PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS),
  176.               MAX_TEXTURE_IMAGE_UNITS);
  177.  
  178.       pc->MaxInstructions    = pc->MaxNativeInstructions    =
  179.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
  180.       pc->MaxAluInstructions = pc->MaxNativeAluInstructions =
  181.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
  182.       pc->MaxTexInstructions = pc->MaxNativeTexInstructions =
  183.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
  184.       pc->MaxTexIndirections = pc->MaxNativeTexIndirections =
  185.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
  186.       pc->MaxAttribs         = pc->MaxNativeAttribs         =
  187.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
  188.       pc->MaxTemps           = pc->MaxNativeTemps           =
  189.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
  190.       pc->MaxAddressRegs     = pc->MaxNativeAddressRegs     =
  191.          sh == PIPE_SHADER_VERTEX ? 1 : 0;
  192.       pc->MaxParameters      = pc->MaxNativeParameters      =
  193.          screen->get_shader_param(screen, sh,
  194.                    PIPE_SHADER_CAP_MAX_CONST_BUFFER_SIZE) / sizeof(float[4]);
  195.       pc->MaxInputComponents =
  196.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS) * 4;
  197.       pc->MaxOutputComponents =
  198.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_OUTPUTS) * 4;
  199.  
  200.       pc->MaxUniformComponents = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
  201.  
  202.       pc->MaxUniformBlocks =
  203.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONST_BUFFERS);
  204.       if (pc->MaxUniformBlocks)
  205.          pc->MaxUniformBlocks -= 1; /* The first one is for ordinary uniforms. */
  206.       pc->MaxUniformBlocks = _min(pc->MaxUniformBlocks, MAX_UNIFORM_BUFFERS);
  207.  
  208.       pc->MaxCombinedUniformComponents = (pc->MaxUniformComponents +
  209.                                           c->MaxUniformBlockSize / 4 *
  210.                                           pc->MaxUniformBlocks);
  211.  
  212.       /* Gallium doesn't really care about local vs. env parameters so use the
  213.        * same limits.
  214.        */
  215.       pc->MaxLocalParams = MIN2(pc->MaxParameters, MAX_PROGRAM_LOCAL_PARAMS);
  216.       pc->MaxEnvParams = MIN2(pc->MaxParameters, MAX_PROGRAM_ENV_PARAMS);
  217.  
  218.       options->EmitNoNoise = TRUE;
  219.  
  220.       /* TODO: make these more fine-grained if anyone needs it */
  221.       options->MaxIfDepth = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
  222.       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
  223.       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
  224.       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
  225.  
  226.       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
  227.  
  228.       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
  229.                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
  230.       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
  231.                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
  232.       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
  233.                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
  234.       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
  235.                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
  236.  
  237.       if (pc->MaxNativeInstructions &&
  238.           (options->EmitNoIndirectUniform || pc->MaxUniformBlocks < 12)) {
  239.          can_ubo = FALSE;
  240.       }
  241.  
  242.       if (options->EmitNoLoops)
  243.          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
  244.  
  245.       options->LowerClipDistance = true;
  246.    }
  247.  
  248.    c->MaxCombinedTextureImageUnits =
  249.          _min(c->Program[MESA_SHADER_VERTEX].MaxTextureImageUnits +
  250.               c->Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits +
  251.               c->Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
  252.               MAX_COMBINED_TEXTURE_IMAGE_UNITS);
  253.  
  254.    /* This depends on program constants. */
  255.    c->MaxTextureCoordUnits
  256.       = _min(c->Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits, MAX_TEXTURE_COORD_UNITS);
  257.  
  258.    c->MaxTextureUnits = _min(c->Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits, c->MaxTextureCoordUnits);
  259.  
  260.    c->Program[MESA_SHADER_VERTEX].MaxAttribs = MIN2(c->Program[MESA_SHADER_VERTEX].MaxAttribs, 16);
  261.  
  262.    /* PIPE_SHADER_CAP_MAX_INPUTS for the FS specifies the maximum number
  263.     * of inputs. It's always 2 colors + N generic inputs. */
  264.    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
  265.                                             PIPE_SHADER_CAP_MAX_INPUTS);
  266.    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
  267.    c->MaxGeometryOutputVertices = screen->get_param(screen, PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES);
  268.    c->MaxGeometryTotalOutputComponents = screen->get_param(screen, PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS);
  269.  
  270.    c->MinProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
  271.    c->MaxProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
  272.  
  273.    c->MaxProgramTextureGatherComponents = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS);
  274.    c->MinProgramTextureGatherOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET);
  275.    c->MaxProgramTextureGatherOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET);
  276.  
  277.    c->MaxTransformFeedbackBuffers =
  278.       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS);
  279.    c->MaxTransformFeedbackBuffers = MIN2(c->MaxTransformFeedbackBuffers, MAX_FEEDBACK_BUFFERS);
  280.    c->MaxTransformFeedbackSeparateComponents =
  281.       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS);
  282.    c->MaxTransformFeedbackInterleavedComponents =
  283.       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS);
  284.    c->MaxVertexStreams =
  285.       MAX2(1, screen->get_param(screen, PIPE_CAP_MAX_VERTEX_STREAMS));
  286.  
  287.    /* The vertex stream must fit into pipe_stream_output_info::stream */
  288.    assert(c->MaxVertexStreams <= 4);
  289.  
  290.    c->MaxVertexAttribStride
  291.       = screen->get_param(screen, PIPE_CAP_MAX_VERTEX_ATTRIB_STRIDE);
  292.  
  293.    c->StripTextureBorder = GL_TRUE;
  294.  
  295.    c->GLSLSkipStrictMaxUniformLimitCheck =
  296.       screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS);
  297.  
  298.    if (can_ubo) {
  299.       extensions->ARB_uniform_buffer_object = GL_TRUE;
  300.       c->UniformBufferOffsetAlignment =
  301.          screen->get_param(screen, PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT);
  302.       c->MaxCombinedUniformBlocks = c->MaxUniformBufferBindings =
  303.          c->Program[MESA_SHADER_VERTEX].MaxUniformBlocks +
  304.          c->Program[MESA_SHADER_GEOMETRY].MaxUniformBlocks +
  305.          c->Program[MESA_SHADER_FRAGMENT].MaxUniformBlocks;
  306.       assert(c->MaxCombinedUniformBlocks <= MAX_COMBINED_UNIFORM_BUFFERS);
  307.    }
  308. }
  309.  
  310.  
  311. /**
  312.  * Given a member \c x of struct gl_extensions, return offset of
  313.  * \c x in bytes.
  314.  */
  315. #define o(x) offsetof(struct gl_extensions, x)
  316.  
  317.  
  318. struct st_extension_cap_mapping {
  319.    int extension_offset;
  320.    int cap;
  321. };
  322.  
  323. struct st_extension_format_mapping {
  324.    int extension_offset[2];
  325.    enum pipe_format format[8];
  326.  
  327.    /* If TRUE, at least one format must be supported for the extensions to be
  328.     * advertised. If FALSE, all the formats must be supported. */
  329.    GLboolean need_at_least_one;
  330. };
  331.  
  332. /**
  333.  * Enable extensions if certain pipe formats are supported by the driver.
  334.  * What extensions will be enabled and what formats must be supported is
  335.  * described by the array of st_extension_format_mapping.
  336.  *
  337.  * target and bind_flags are passed to is_format_supported.
  338.  */
  339. static void
  340. init_format_extensions(struct pipe_screen *screen,
  341.                        struct gl_extensions *extensions,
  342.                        const struct st_extension_format_mapping *mapping,
  343.                        unsigned num_mappings,
  344.                        enum pipe_texture_target target,
  345.                        unsigned bind_flags)
  346. {
  347.    GLboolean *extension_table = (GLboolean *) extensions;
  348.    unsigned i;
  349.    int j;
  350.    int num_formats = ARRAY_SIZE(mapping->format);
  351.    int num_ext = ARRAY_SIZE(mapping->extension_offset);
  352.  
  353.    for (i = 0; i < num_mappings; i++) {
  354.       int num_supported = 0;
  355.  
  356.       /* Examine each format in the list. */
  357.       for (j = 0; j < num_formats && mapping[i].format[j]; j++) {
  358.          if (screen->is_format_supported(screen, mapping[i].format[j],
  359.                                          target, 0, bind_flags)) {
  360.             num_supported++;
  361.          }
  362.       }
  363.  
  364.       if (!num_supported ||
  365.           (!mapping[i].need_at_least_one && num_supported != j)) {
  366.          continue;
  367.       }
  368.  
  369.       /* Enable all extensions in the list. */
  370.       for (j = 0; j < num_ext && mapping[i].extension_offset[j]; j++)
  371.          extension_table[mapping[i].extension_offset[j]] = GL_TRUE;
  372.    }
  373. }
  374.  
  375.  
  376. /**
  377.  * Given a list of formats and bind flags, return the maximum number
  378.  * of samples supported by any of those formats.
  379.  */
  380. static unsigned
  381. get_max_samples_for_formats(struct pipe_screen *screen,
  382.                             unsigned num_formats,
  383.                             enum pipe_format *formats,
  384.                             unsigned max_samples,
  385.                             unsigned bind)
  386. {
  387.    unsigned i, f;
  388.  
  389.    for (i = max_samples; i > 0; --i) {
  390.       for (f = 0; f < num_formats; f++) {
  391.          if (screen->is_format_supported(screen, formats[f],
  392.                                          PIPE_TEXTURE_2D, i, bind)) {
  393.             return i;
  394.          }
  395.       }
  396.    }
  397.    return 0;
  398. }
  399.  
  400.  
  401. /**
  402.  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
  403.  * which GL extensions are supported.
  404.  * Quite a few extensions are always supported because they are standard
  405.  * features or can be built on top of other gallium features.
  406.  * Some fine tuning may still be needed.
  407.  */
  408. void st_init_extensions(struct pipe_screen *screen,
  409.                         struct gl_constants *consts,
  410.                         struct gl_extensions *extensions,
  411.                         struct st_config_options *options,
  412.                         boolean has_lib_dxtc)
  413. {
  414.    unsigned i;
  415.    int glsl_feature_level;
  416.    GLboolean *extension_table = (GLboolean *) extensions;
  417.  
  418.    static const struct st_extension_cap_mapping cap_mapping[] = {
  419.       { o(ARB_base_instance),                PIPE_CAP_START_INSTANCE                   },
  420.       { o(ARB_buffer_storage),               PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT },
  421.       { o(ARB_depth_clamp),                  PIPE_CAP_DEPTH_CLIP_DISABLE               },
  422.       { o(ARB_depth_texture),                PIPE_CAP_TEXTURE_SHADOW_MAP               },
  423.       { o(ARB_draw_buffers_blend),           PIPE_CAP_INDEP_BLEND_FUNC                 },
  424.       { o(ARB_draw_instanced),               PIPE_CAP_TGSI_INSTANCEID                  },
  425.       { o(ARB_fragment_program_shadow),      PIPE_CAP_TEXTURE_SHADOW_MAP               },
  426.       { o(ARB_instanced_arrays),             PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR  },
  427.       { o(ARB_occlusion_query),              PIPE_CAP_OCCLUSION_QUERY                  },
  428.       { o(ARB_occlusion_query2),             PIPE_CAP_OCCLUSION_QUERY                  },
  429.       { o(ARB_pipeline_statistics_query),    PIPE_CAP_QUERY_PIPELINE_STATISTICS        },
  430.       { o(ARB_point_sprite),                 PIPE_CAP_POINT_SPRITE                     },
  431.       { o(ARB_seamless_cube_map),            PIPE_CAP_SEAMLESS_CUBE_MAP                },
  432.       { o(ARB_shader_stencil_export),        PIPE_CAP_SHADER_STENCIL_EXPORT            },
  433.       { o(ARB_shader_texture_lod),           PIPE_CAP_SM3                              },
  434.       { o(ARB_shadow),                       PIPE_CAP_TEXTURE_SHADOW_MAP               },
  435.       { o(ARB_texture_mirror_clamp_to_edge), PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
  436.       { o(ARB_texture_non_power_of_two),     PIPE_CAP_NPOT_TEXTURES                    },
  437.       { o(ARB_timer_query),                  PIPE_CAP_QUERY_TIMESTAMP                  },
  438.       { o(ARB_transform_feedback2),          PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME       },
  439.       { o(ARB_transform_feedback3),          PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME       },
  440.  
  441.       { o(EXT_blend_equation_separate),      PIPE_CAP_BLEND_EQUATION_SEPARATE          },
  442.       { o(EXT_draw_buffers2),                PIPE_CAP_INDEP_BLEND_ENABLE               },
  443.       { o(EXT_stencil_two_side),             PIPE_CAP_TWO_SIDED_STENCIL                },
  444.       { o(EXT_texture_array),                PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS         },
  445.       { o(EXT_texture_filter_anisotropic),   PIPE_CAP_ANISOTROPIC_FILTER               },
  446.       { o(EXT_texture_mirror_clamp),         PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
  447.       { o(EXT_texture_swizzle),              PIPE_CAP_TEXTURE_SWIZZLE                  },
  448.       { o(EXT_transform_feedback),           PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS        },
  449.  
  450.       { o(AMD_pinned_memory),                PIPE_CAP_RESOURCE_FROM_USER_MEMORY        },
  451.       { o(AMD_seamless_cubemap_per_texture), PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE    },
  452.       { o(ATI_separate_stencil),             PIPE_CAP_TWO_SIDED_STENCIL                },
  453.       { o(ATI_texture_mirror_once),          PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
  454.       { o(NV_conditional_render),            PIPE_CAP_CONDITIONAL_RENDER               },
  455.       { o(NV_texture_barrier),               PIPE_CAP_TEXTURE_BARRIER                  },
  456.       /* GL_NV_point_sprite is not supported by gallium because we don't
  457.        * support the GL_POINT_SPRITE_R_MODE_NV option. */
  458.  
  459.       { o(OES_standard_derivatives),         PIPE_CAP_SM3                              },
  460.       { o(ARB_texture_cube_map_array),       PIPE_CAP_CUBE_MAP_ARRAY                   },
  461.       { o(ARB_texture_multisample),          PIPE_CAP_TEXTURE_MULTISAMPLE              },
  462.       { o(ARB_texture_query_lod),            PIPE_CAP_TEXTURE_QUERY_LOD                },
  463.       { o(ARB_sample_shading),               PIPE_CAP_SAMPLE_SHADING                   },
  464.       { o(ARB_draw_indirect),                PIPE_CAP_DRAW_INDIRECT                    },
  465.       { o(ARB_derivative_control),           PIPE_CAP_TGSI_FS_FINE_DERIVATIVE          },
  466.       { o(ARB_conditional_render_inverted),  PIPE_CAP_CONDITIONAL_RENDER_INVERTED      },
  467.       { o(ARB_texture_view),                 PIPE_CAP_SAMPLER_VIEW_TARGET              },
  468.       { o(ARB_clip_control),                 PIPE_CAP_CLIP_HALFZ                       },
  469.       { o(EXT_polygon_offset_clamp),         PIPE_CAP_POLYGON_OFFSET_CLAMP             },
  470.    };
  471.  
  472.    /* Required: render target and sampler support */
  473.    static const struct st_extension_format_mapping rendertarget_mapping[] = {
  474.       { { o(ARB_texture_float) },
  475.         { PIPE_FORMAT_R32G32B32A32_FLOAT,
  476.           PIPE_FORMAT_R16G16B16A16_FLOAT } },
  477.  
  478.       { { o(ARB_texture_rgb10_a2ui) },
  479.         { PIPE_FORMAT_R10G10B10A2_UINT,
  480.           PIPE_FORMAT_B10G10R10A2_UINT },
  481.          GL_TRUE }, /* at least one format must be supported */
  482.  
  483.       { { o(EXT_framebuffer_sRGB) },
  484.         { PIPE_FORMAT_A8B8G8R8_SRGB,
  485.           PIPE_FORMAT_B8G8R8A8_SRGB },
  486.          GL_TRUE }, /* at least one format must be supported */
  487.  
  488.       { { o(EXT_packed_float) },
  489.         { PIPE_FORMAT_R11G11B10_FLOAT } },
  490.  
  491.       { { o(EXT_texture_integer) },
  492.         { PIPE_FORMAT_R32G32B32A32_UINT,
  493.           PIPE_FORMAT_R32G32B32A32_SINT } },
  494.  
  495.       { { o(ARB_texture_rg) },
  496.         { PIPE_FORMAT_R8_UNORM,
  497.           PIPE_FORMAT_R8G8_UNORM } },
  498.    };
  499.  
  500.    /* Required: depth stencil and sampler support */
  501.    static const struct st_extension_format_mapping depthstencil_mapping[] = {
  502.       { { o(ARB_depth_buffer_float) },
  503.         { PIPE_FORMAT_Z32_FLOAT,
  504.           PIPE_FORMAT_Z32_FLOAT_S8X24_UINT } },
  505.    };
  506.  
  507.    /* Required: sampler support */
  508.    static const struct st_extension_format_mapping texture_mapping[] = {
  509.       { { o(ARB_texture_compression_rgtc) },
  510.         { PIPE_FORMAT_RGTC1_UNORM,
  511.           PIPE_FORMAT_RGTC1_SNORM,
  512.           PIPE_FORMAT_RGTC2_UNORM,
  513.           PIPE_FORMAT_RGTC2_SNORM } },
  514.  
  515.       { { o(EXT_texture_compression_latc) },
  516.         { PIPE_FORMAT_LATC1_UNORM,
  517.           PIPE_FORMAT_LATC1_SNORM,
  518.           PIPE_FORMAT_LATC2_UNORM,
  519.           PIPE_FORMAT_LATC2_SNORM } },
  520.  
  521.       { { o(EXT_texture_compression_s3tc),
  522.           o(ANGLE_texture_compression_dxt) },
  523.         { PIPE_FORMAT_DXT1_RGB,
  524.           PIPE_FORMAT_DXT1_RGBA,
  525.           PIPE_FORMAT_DXT3_RGBA,
  526.           PIPE_FORMAT_DXT5_RGBA } },
  527.  
  528.       { { o(ARB_texture_compression_bptc) },
  529.         { PIPE_FORMAT_BPTC_RGBA_UNORM,
  530.           PIPE_FORMAT_BPTC_SRGBA,
  531.           PIPE_FORMAT_BPTC_RGB_FLOAT,
  532.           PIPE_FORMAT_BPTC_RGB_UFLOAT } },
  533.  
  534.       { { o(EXT_texture_shared_exponent) },
  535.         { PIPE_FORMAT_R9G9B9E5_FLOAT } },
  536.  
  537.       { { o(EXT_texture_snorm) },
  538.         { PIPE_FORMAT_R8G8B8A8_SNORM } },
  539.  
  540.       { { o(EXT_texture_sRGB),
  541.           o(EXT_texture_sRGB_decode) },
  542.         { PIPE_FORMAT_A8B8G8R8_SRGB,
  543.           PIPE_FORMAT_B8G8R8A8_SRGB },
  544.         GL_TRUE }, /* at least one format must be supported */
  545.  
  546.       { { o(ATI_texture_compression_3dc) },
  547.         { PIPE_FORMAT_LATC2_UNORM } },
  548.  
  549.       { { o(MESA_ycbcr_texture) },
  550.         { PIPE_FORMAT_UYVY,
  551.           PIPE_FORMAT_YUYV },
  552.         GL_TRUE }, /* at least one format must be supported */
  553.  
  554.       { { o(OES_compressed_ETC1_RGB8_texture) },
  555.         { PIPE_FORMAT_ETC1_RGB8,
  556.           PIPE_FORMAT_R8G8B8A8_UNORM },
  557.         GL_TRUE }, /* at least one format must be supported */
  558.  
  559.       { { o(ARB_stencil_texturing) },
  560.         { PIPE_FORMAT_X24S8_UINT,
  561.           PIPE_FORMAT_S8X24_UINT },
  562.         GL_TRUE }, /* at least one format must be supported */
  563.    };
  564.  
  565.    /* Required: vertex fetch support. */
  566.    static const struct st_extension_format_mapping vertex_mapping[] = {
  567.       { { o(ARB_vertex_type_2_10_10_10_rev) },
  568.         { PIPE_FORMAT_R10G10B10A2_UNORM,
  569.           PIPE_FORMAT_B10G10R10A2_UNORM,
  570.           PIPE_FORMAT_R10G10B10A2_SNORM,
  571.           PIPE_FORMAT_B10G10R10A2_SNORM,
  572.           PIPE_FORMAT_R10G10B10A2_USCALED,
  573.           PIPE_FORMAT_B10G10R10A2_USCALED,
  574.           PIPE_FORMAT_R10G10B10A2_SSCALED,
  575.           PIPE_FORMAT_B10G10R10A2_SSCALED } },
  576.       { { o(ARB_vertex_type_10f_11f_11f_rev) },
  577.         { PIPE_FORMAT_R11G11B10_FLOAT } },
  578.    };
  579.  
  580.    static const struct st_extension_format_mapping tbo_rgb32[] = {
  581.       { {o(ARB_texture_buffer_object_rgb32) },
  582.         { PIPE_FORMAT_R32G32B32_FLOAT,
  583.           PIPE_FORMAT_R32G32B32_UINT,
  584.           PIPE_FORMAT_R32G32B32_SINT,
  585.         } },
  586.    };
  587.  
  588.    /*
  589.     * Extensions that are supported by all Gallium drivers:
  590.     */
  591.    extensions->ARB_ES2_compatibility = GL_TRUE;
  592.    extensions->ARB_draw_elements_base_vertex = GL_TRUE;
  593.    extensions->ARB_explicit_attrib_location = GL_TRUE;
  594.    extensions->ARB_explicit_uniform_location = GL_TRUE;
  595.    extensions->ARB_fragment_coord_conventions = GL_TRUE;
  596.    extensions->ARB_fragment_program = GL_TRUE;
  597.    extensions->ARB_fragment_shader = GL_TRUE;
  598.    extensions->ARB_half_float_vertex = GL_TRUE;
  599.    extensions->ARB_internalformat_query = GL_TRUE;
  600.    extensions->ARB_map_buffer_range = GL_TRUE;
  601.    extensions->ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
  602.    extensions->ARB_texture_cube_map = GL_TRUE;
  603.    extensions->ARB_texture_env_combine = GL_TRUE;
  604.    extensions->ARB_texture_env_crossbar = GL_TRUE;
  605.    extensions->ARB_texture_env_dot3 = GL_TRUE;
  606.    extensions->ARB_vertex_program = GL_TRUE;
  607.    extensions->ARB_vertex_shader = GL_TRUE;
  608.  
  609.    extensions->EXT_blend_color = GL_TRUE;
  610.    extensions->EXT_blend_func_separate = GL_TRUE;
  611.    extensions->EXT_blend_minmax = GL_TRUE;
  612.    extensions->EXT_gpu_program_parameters = GL_TRUE;
  613.    extensions->EXT_pixel_buffer_object = GL_TRUE;
  614.    extensions->EXT_point_parameters = GL_TRUE;
  615.    extensions->EXT_provoking_vertex = GL_TRUE;
  616.  
  617.    extensions->EXT_texture_env_dot3 = GL_TRUE;
  618.    extensions->EXT_vertex_array_bgra = GL_TRUE;
  619.  
  620.    extensions->ATI_texture_env_combine3 = GL_TRUE;
  621.  
  622.    extensions->MESA_pack_invert = GL_TRUE;
  623.  
  624.    extensions->NV_fog_distance = GL_TRUE;
  625.    extensions->NV_texture_env_combine4 = GL_TRUE;
  626.    extensions->NV_texture_rectangle = GL_TRUE;
  627.  
  628.    extensions->OES_EGL_image = GL_TRUE;
  629.    extensions->OES_EGL_image_external = GL_TRUE;
  630.    extensions->OES_draw_texture = GL_TRUE;
  631.  
  632.    /* Expose the extensions which directly correspond to gallium caps. */
  633.    for (i = 0; i < ARRAY_SIZE(cap_mapping); i++) {
  634.       if (screen->get_param(screen, cap_mapping[i].cap)) {
  635.          extension_table[cap_mapping[i].extension_offset] = GL_TRUE;
  636.       }
  637.    }
  638.  
  639.    /* Expose the extensions which directly correspond to gallium formats. */
  640.    init_format_extensions(screen, extensions, rendertarget_mapping,
  641.                           ARRAY_SIZE(rendertarget_mapping), PIPE_TEXTURE_2D,
  642.                           PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW);
  643.    init_format_extensions(screen, extensions, depthstencil_mapping,
  644.                           ARRAY_SIZE(depthstencil_mapping), PIPE_TEXTURE_2D,
  645.                           PIPE_BIND_DEPTH_STENCIL | PIPE_BIND_SAMPLER_VIEW);
  646.    init_format_extensions(screen, extensions, texture_mapping,
  647.                           ARRAY_SIZE(texture_mapping), PIPE_TEXTURE_2D,
  648.                           PIPE_BIND_SAMPLER_VIEW);
  649.    init_format_extensions(screen, extensions, vertex_mapping,
  650.                           ARRAY_SIZE(vertex_mapping), PIPE_BUFFER,
  651.                           PIPE_BIND_VERTEX_BUFFER);
  652.  
  653.    /* ARB_direct_state_access requires OpenGL 2.0. Assume that all drivers
  654.     * that support NPOT textures are able to support GL 2.0.
  655.     */
  656.    if (extensions->ARB_texture_non_power_of_two)
  657.       extensions->ARB_direct_state_access = GL_TRUE;
  658.  
  659.    if (extensions->ARB_stencil_texturing)
  660.       extensions->ARB_texture_stencil8 = GL_TRUE;
  661.  
  662.    /* Figure out GLSL support. */
  663.    glsl_feature_level = screen->get_param(screen, PIPE_CAP_GLSL_FEATURE_LEVEL);
  664.  
  665.    consts->GLSLVersion = glsl_feature_level;
  666.    if (glsl_feature_level >= 410)
  667.       consts->GLSLVersion = 410;
  668.  
  669.    _mesa_override_glsl_version(consts);
  670.  
  671.    if (options->force_glsl_version > 0 &&
  672.        options->force_glsl_version <= consts->GLSLVersion) {
  673.       consts->ForceGLSLVersion = options->force_glsl_version;
  674.    }
  675.  
  676.    if (glsl_feature_level >= 400)
  677.       extensions->ARB_gpu_shader5 = GL_TRUE;
  678.    if (glsl_feature_level >= 410)
  679.       extensions->ARB_shader_precision = GL_TRUE;
  680.  
  681.    /* This extension needs full OpenGL 3.2, but we don't know if that's
  682.     * supported at this point. Only check the GLSL version. */
  683.    if (consts->GLSLVersion >= 150 &&
  684.        screen->get_param(screen, PIPE_CAP_TGSI_VS_LAYER_VIEWPORT)) {
  685.       extensions->AMD_vertex_shader_layer = GL_TRUE;
  686.    }
  687.  
  688.    if (consts->GLSLVersion >= 130) {
  689.       consts->NativeIntegers = GL_TRUE;
  690.       consts->MaxClipPlanes = 8;
  691.  
  692.       if (screen->get_param(screen, PIPE_CAP_VERTEXID_NOBASE)) {
  693.          consts->VertexID_is_zero_based = GL_TRUE;
  694.       }
  695.  
  696.       /* Extensions that either depend on GLSL 1.30 or are a subset thereof. */
  697.       extensions->ARB_conservative_depth = GL_TRUE;
  698.       extensions->ARB_shading_language_packing = GL_TRUE;
  699.       extensions->OES_depth_texture_cube_map = GL_TRUE;
  700.       extensions->ARB_shading_language_420pack = GL_TRUE;
  701.       extensions->ARB_texture_query_levels = GL_TRUE;
  702.  
  703.       if (!options->disable_shader_bit_encoding) {
  704.          extensions->ARB_shader_bit_encoding = GL_TRUE;
  705.       }
  706.  
  707.       extensions->EXT_shader_integer_mix = GL_TRUE;
  708.    } else {
  709.       /* Optional integer support for GLSL 1.2. */
  710.       if (screen->get_shader_param(screen, PIPE_SHADER_VERTEX,
  711.                                    PIPE_SHADER_CAP_INTEGERS) &&
  712.           screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
  713.                                    PIPE_SHADER_CAP_INTEGERS)) {
  714.          consts->NativeIntegers = GL_TRUE;
  715.  
  716.          extensions->EXT_shader_integer_mix = GL_TRUE;
  717.       }
  718.  
  719.       /* Integer textures make no sense before GLSL 1.30 */
  720.       extensions->EXT_texture_integer = GL_FALSE;
  721.    }
  722.  
  723.    consts->UniformBooleanTrue = consts->NativeIntegers ? ~0U : fui(1.0f);
  724.  
  725.    /* Below are the cases which cannot be moved into tables easily. */
  726.  
  727.    if (!has_lib_dxtc && !options->force_s3tc_enable) {
  728.       extensions->EXT_texture_compression_s3tc = GL_FALSE;
  729.       extensions->ANGLE_texture_compression_dxt = GL_FALSE;
  730.    }
  731.  
  732.    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY,
  733.                                 PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
  734. #if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
  735.       extensions->ARB_geometry_shader4 = GL_TRUE;
  736. #endif
  737.    }
  738.  
  739.    if (screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
  740.       extensions->NV_primitive_restart = GL_TRUE;
  741.    }
  742.  
  743.    /* ARB_color_buffer_float. */
  744.    if (screen->get_param(screen, PIPE_CAP_VERTEX_COLOR_UNCLAMPED)) {
  745.       extensions->ARB_color_buffer_float = GL_TRUE;
  746.    }
  747.  
  748.    if (screen->fence_finish) {
  749.       extensions->ARB_sync = GL_TRUE;
  750.    }
  751.  
  752.    /* Maximum sample count. */
  753.    {
  754.       enum pipe_format color_formats[] = {
  755.          PIPE_FORMAT_R8G8B8A8_UNORM,
  756.          PIPE_FORMAT_B8G8R8A8_UNORM,
  757.          PIPE_FORMAT_A8R8G8B8_UNORM,
  758.          PIPE_FORMAT_A8B8G8R8_UNORM,
  759.       };
  760.       enum pipe_format depth_formats[] = {
  761.          PIPE_FORMAT_Z16_UNORM,
  762.          PIPE_FORMAT_Z24X8_UNORM,
  763.          PIPE_FORMAT_X8Z24_UNORM,
  764.          PIPE_FORMAT_Z32_UNORM,
  765.          PIPE_FORMAT_Z32_FLOAT
  766.       };
  767.       enum pipe_format int_formats[] = {
  768.          PIPE_FORMAT_R8G8B8A8_SINT
  769.       };
  770.  
  771.       consts->MaxSamples =
  772.          get_max_samples_for_formats(screen, ARRAY_SIZE(color_formats),
  773.                                      color_formats, 16,
  774.                                      PIPE_BIND_RENDER_TARGET);
  775.  
  776.       consts->MaxColorTextureSamples =
  777.          get_max_samples_for_formats(screen, ARRAY_SIZE(color_formats),
  778.                                      color_formats, consts->MaxSamples,
  779.                                      PIPE_BIND_SAMPLER_VIEW);
  780.  
  781.       consts->MaxDepthTextureSamples =
  782.          get_max_samples_for_formats(screen, ARRAY_SIZE(depth_formats),
  783.                                      depth_formats, consts->MaxSamples,
  784.                                      PIPE_BIND_SAMPLER_VIEW);
  785.  
  786.       consts->MaxIntegerSamples =
  787.          get_max_samples_for_formats(screen, ARRAY_SIZE(int_formats),
  788.                                      int_formats, consts->MaxSamples,
  789.                                      PIPE_BIND_SAMPLER_VIEW);
  790.    }
  791.    if (consts->MaxSamples == 1) {
  792.       /* one sample doesn't really make sense */
  793.       consts->MaxSamples = 0;
  794.    }
  795.    else if (consts->MaxSamples >= 2) {
  796.       extensions->EXT_framebuffer_multisample = GL_TRUE;
  797.       extensions->EXT_framebuffer_multisample_blit_scaled = GL_TRUE;
  798.    }
  799.  
  800.    if (consts->MaxSamples == 0 && screen->get_param(screen, PIPE_CAP_FAKE_SW_MSAA)) {
  801.         consts->FakeSWMSAA = GL_TRUE;
  802.         extensions->EXT_framebuffer_multisample = GL_TRUE;
  803.         extensions->EXT_framebuffer_multisample_blit_scaled = GL_TRUE;
  804.         extensions->ARB_texture_multisample = GL_TRUE;
  805.    }
  806.  
  807.    if (consts->MaxDualSourceDrawBuffers > 0 &&
  808.        !options->disable_blend_func_extended)
  809.       extensions->ARB_blend_func_extended = GL_TRUE;
  810.  
  811.    if (screen->get_param(screen, PIPE_CAP_QUERY_TIME_ELAPSED) ||
  812.        extensions->ARB_timer_query) {
  813.       extensions->EXT_timer_query = GL_TRUE;
  814.    }
  815.  
  816.    if (extensions->ARB_transform_feedback2 &&
  817.        extensions->ARB_draw_instanced) {
  818.       extensions->ARB_transform_feedback_instanced = GL_TRUE;
  819.    }
  820.    if (options->force_glsl_extensions_warn)
  821.       consts->ForceGLSLExtensionsWarn = 1;
  822.  
  823.    if (options->disable_glsl_line_continuations)
  824.       consts->DisableGLSLLineContinuations = 1;
  825.  
  826.    if (options->allow_glsl_extension_directive_midshader)
  827.       consts->AllowGLSLExtensionDirectiveMidShader = GL_TRUE;
  828.  
  829.    consts->MinMapBufferAlignment =
  830.       screen->get_param(screen, PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT);
  831.  
  832.    if (screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OBJECTS)) {
  833.       extensions->ARB_texture_buffer_object = GL_TRUE;
  834.  
  835.       consts->MaxTextureBufferSize =
  836.          _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE),
  837.               (1u << 31) - 1);
  838.       consts->TextureBufferOffsetAlignment =
  839.          screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT);
  840.  
  841.       if (consts->TextureBufferOffsetAlignment)
  842.          extensions->ARB_texture_buffer_range = GL_TRUE;
  843.  
  844.       init_format_extensions(screen, extensions, tbo_rgb32,
  845.                              ARRAY_SIZE(tbo_rgb32), PIPE_BUFFER,
  846.                              PIPE_BIND_SAMPLER_VIEW);
  847.    }
  848.  
  849.    if (screen->get_param(screen, PIPE_CAP_MIXED_FRAMEBUFFER_SIZES)) {
  850.       extensions->ARB_framebuffer_object = GL_TRUE;
  851.    }
  852.  
  853.    /* Unpacking a varying in the fragment shader costs 1 texture indirection.
  854.     * If the number of available texture indirections is very limited, then we
  855.     * prefer to disable varying packing rather than run the risk of varying
  856.     * packing preventing a shader from running.
  857.     */
  858.    if (screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
  859.                                 PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS) <= 8) {
  860.       /* We can't disable varying packing if transform feedback is available,
  861.        * because transform feedback code assumes a packed varying layout.
  862.        */
  863.       if (!extensions->EXT_transform_feedback)
  864.          consts->DisableVaryingPacking = GL_TRUE;
  865.    }
  866.  
  867.    consts->MaxViewports = screen->get_param(screen, PIPE_CAP_MAX_VIEWPORTS);
  868.    if (consts->MaxViewports >= 16) {
  869.       consts->ViewportBounds.Min = -16384.0;
  870.       consts->ViewportBounds.Max = 16384.0;
  871.       extensions->ARB_viewport_array = GL_TRUE;
  872.       extensions->ARB_fragment_layer_viewport = GL_TRUE;
  873.       if (extensions->AMD_vertex_shader_layer)
  874.          extensions->AMD_vertex_shader_viewport_index = GL_TRUE;
  875.    }
  876.  
  877.    if (consts->MaxProgramTextureGatherComponents > 0)
  878.       extensions->ARB_texture_gather = GL_TRUE;
  879.  
  880.    /* GL_ARB_ES3_compatibility.
  881.     *
  882.     * Assume that ES3 is supported if GLSL 3.30 is supported.
  883.     * (OpenGL 3.3 is a requirement for that extension.)
  884.     */
  885.    if (consts->GLSLVersion >= 330 &&
  886.        /* Requirements for ETC2 emulation. */
  887.        screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_UNORM,
  888.                                    PIPE_TEXTURE_2D, 0,
  889.                                    PIPE_BIND_SAMPLER_VIEW) &&
  890.        screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
  891.                                    PIPE_TEXTURE_2D, 0,
  892.                                    PIPE_BIND_SAMPLER_VIEW) &&
  893.        screen->is_format_supported(screen, PIPE_FORMAT_R16_UNORM,
  894.                                    PIPE_TEXTURE_2D, 0,
  895.                                    PIPE_BIND_SAMPLER_VIEW) &&
  896.        screen->is_format_supported(screen, PIPE_FORMAT_R16G16_UNORM,
  897.                                    PIPE_TEXTURE_2D, 0,
  898.                                    PIPE_BIND_SAMPLER_VIEW) &&
  899.        screen->is_format_supported(screen, PIPE_FORMAT_R16_SNORM,
  900.                                    PIPE_TEXTURE_2D, 0,
  901.                                    PIPE_BIND_SAMPLER_VIEW) &&
  902.        screen->is_format_supported(screen, PIPE_FORMAT_R16G16_SNORM,
  903.                                    PIPE_TEXTURE_2D, 0,
  904.                                    PIPE_BIND_SAMPLER_VIEW)) {
  905.       extensions->ARB_ES3_compatibility = GL_TRUE;
  906.    }
  907.  
  908.    if (screen->get_video_param &&
  909.        screen->get_video_param(screen, PIPE_VIDEO_PROFILE_UNKNOWN,
  910.                                PIPE_VIDEO_ENTRYPOINT_BITSTREAM,
  911.                                PIPE_VIDEO_CAP_SUPPORTS_INTERLACED)) {
  912.       extensions->NV_vdpau_interop = GL_TRUE;
  913.    }
  914.  
  915.    if (screen->get_shader_param(screen, PIPE_SHADER_VERTEX,
  916.                                 PIPE_SHADER_CAP_DOUBLES) &&
  917.        screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
  918.                                 PIPE_SHADER_CAP_DOUBLES)) {
  919.       extensions->ARB_gpu_shader_fp64 = GL_TRUE;
  920.       extensions->ARB_vertex_attrib_64bit = GL_TRUE;
  921.    }
  922. }
  923.