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  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/version.h"
  33.  
  34. #include "pipe/p_context.h"
  35. #include "pipe/p_defines.h"
  36. #include "pipe/p_screen.h"
  37.  
  38. #include "st_context.h"
  39. #include "st_extensions.h"
  40. #include "st_format.h"
  41.  
  42. static unsigned _min(unsigned a, unsigned b)
  43. {
  44.    return (a < b) ? a : b;
  45. }
  46.  
  47. static float _maxf(float a, float b)
  48. {
  49.    return (a > b) ? a : b;
  50. }
  51.  
  52. static int _clamp(int a, int min, int max)
  53. {
  54.    if (a < min)
  55.       return min;
  56.    else if (a > max)
  57.       return max;
  58.    else
  59.       return a;
  60. }
  61.  
  62.  
  63. /**
  64.  * Query driver to get implementation limits.
  65.  * Note that we have to limit/clamp against Mesa's internal limits too.
  66.  */
  67. void st_init_limits(struct st_context *st)
  68. {
  69.    struct pipe_screen *screen = st->pipe->screen;
  70.    struct gl_constants *c = &st->ctx->Const;
  71.    unsigned sh;
  72.    boolean can_ubo = TRUE;
  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->MaxCombinedTextureImageUnits
  93.       = _min(screen->get_param(screen, PIPE_CAP_MAX_COMBINED_SAMPLERS),
  94.              MAX_COMBINED_TEXTURE_IMAGE_UNITS);
  95.  
  96.    /* Define max viewport size and max renderbuffer size in terms of
  97.     * max texture size (note: max tex RECT size = max tex 2D size).
  98.     * If this isn't true for some hardware we'll need new PIPE_CAP_ queries.
  99.     */
  100.    c->MaxViewportWidth =
  101.    c->MaxViewportHeight =
  102.    c->MaxRenderbufferSize = c->MaxTextureRectSize;
  103.  
  104.    c->MaxDrawBuffers = c->MaxColorAttachments =
  105.       _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
  106.              1, MAX_DRAW_BUFFERS);
  107.  
  108.    c->MaxDualSourceDrawBuffers
  109.       = _clamp(screen->get_param(screen, PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS),
  110.               0, MAX_DRAW_BUFFERS);
  111.  
  112.    c->MaxLineWidth
  113.       = _maxf(1.0f, screen->get_paramf(screen,
  114.                                        PIPE_CAPF_MAX_LINE_WIDTH));
  115.    c->MaxLineWidthAA
  116.       = _maxf(1.0f, screen->get_paramf(screen,
  117.                                        PIPE_CAPF_MAX_LINE_WIDTH_AA));
  118.  
  119.    c->MaxPointSize
  120.       = _maxf(1.0f, screen->get_paramf(screen,
  121.                                        PIPE_CAPF_MAX_POINT_WIDTH));
  122.    c->MaxPointSizeAA
  123.       = _maxf(1.0f, screen->get_paramf(screen,
  124.                                        PIPE_CAPF_MAX_POINT_WIDTH_AA));
  125.    /* called after _mesa_create_context/_mesa_init_point, fix default user
  126.     * settable max point size up
  127.     */
  128.    st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);
  129.    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
  130.     * for non-aa sizes, but we can go down to 0.0 for aa points.
  131.     */
  132.    c->MinPointSize = 1.0f;
  133.    c->MinPointSizeAA = 0.0f;
  134.  
  135.    c->MaxTextureMaxAnisotropy
  136.       = _maxf(2.0f, screen->get_paramf(screen,
  137.                                  PIPE_CAPF_MAX_TEXTURE_ANISOTROPY));
  138.  
  139.    c->MaxTextureLodBias
  140.       = screen->get_paramf(screen, PIPE_CAPF_MAX_TEXTURE_LOD_BIAS);
  141.  
  142.    c->QuadsFollowProvokingVertexConvention = screen->get_param(
  143.       screen, PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION);
  144.  
  145.    c->MaxUniformBlockSize =
  146.       screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
  147.                                PIPE_SHADER_CAP_MAX_CONSTS) * 16;
  148.    if (c->MaxUniformBlockSize < 16384) {
  149.       can_ubo = FALSE;
  150.    }
  151.  
  152.    for (sh = 0; sh < PIPE_SHADER_TYPES; ++sh) {
  153.       struct gl_shader_compiler_options *options;
  154.       struct gl_program_constants *pc;
  155.  
  156.       switch (sh) {
  157.       case PIPE_SHADER_FRAGMENT:
  158.          pc = &c->FragmentProgram;
  159.          options = &st->ctx->ShaderCompilerOptions[MESA_SHADER_FRAGMENT];
  160.          break;
  161.       case PIPE_SHADER_VERTEX:
  162.          pc = &c->VertexProgram;
  163.          options = &st->ctx->ShaderCompilerOptions[MESA_SHADER_VERTEX];
  164.          break;
  165.       case PIPE_SHADER_GEOMETRY:
  166.          pc = &c->GeometryProgram;
  167.          options = &st->ctx->ShaderCompilerOptions[MESA_SHADER_GEOMETRY];
  168.          break;
  169.       default:
  170.          /* compute shader, etc. */
  171.          continue;
  172.       }
  173.  
  174.       pc->MaxTextureImageUnits =
  175.          _min(screen->get_shader_param(screen, sh,
  176.                                        PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS),
  177.               MAX_TEXTURE_IMAGE_UNITS);
  178.  
  179.       pc->MaxInstructions    = pc->MaxNativeInstructions    =
  180.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
  181.       pc->MaxAluInstructions = pc->MaxNativeAluInstructions =
  182.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
  183.       pc->MaxTexInstructions = pc->MaxNativeTexInstructions =
  184.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
  185.       pc->MaxTexIndirections = pc->MaxNativeTexIndirections =
  186.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
  187.       pc->MaxAttribs         = pc->MaxNativeAttribs         =
  188.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
  189.       pc->MaxTemps           = pc->MaxNativeTemps           =
  190.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
  191.       pc->MaxAddressRegs     = pc->MaxNativeAddressRegs     =
  192.          _min(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS),
  193.               MAX_PROGRAM_ADDRESS_REGS);
  194.       pc->MaxParameters      = pc->MaxNativeParameters      =
  195.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);
  196.  
  197.       pc->MaxUniformComponents = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
  198.  
  199.       pc->MaxUniformBlocks =
  200.          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONST_BUFFERS);
  201.       if (pc->MaxUniformBlocks)
  202.          pc->MaxUniformBlocks -= 1; /* The first one is for ordinary uniforms. */
  203.       pc->MaxUniformBlocks = _min(pc->MaxUniformBlocks, MAX_UNIFORM_BUFFERS);
  204.  
  205.       pc->MaxCombinedUniformComponents = (pc->MaxUniformComponents +
  206.                                           c->MaxUniformBlockSize / 4 *
  207.                                           pc->MaxUniformBlocks);
  208.  
  209.       /* Gallium doesn't really care about local vs. env parameters so use the
  210.        * same limits.
  211.        */
  212.       pc->MaxLocalParams = MIN2(pc->MaxParameters, MAX_PROGRAM_LOCAL_PARAMS);
  213.       pc->MaxEnvParams = MIN2(pc->MaxParameters, MAX_PROGRAM_ENV_PARAMS);
  214.  
  215.       options->EmitNoNoise = TRUE;
  216.  
  217.       /* TODO: make these more fine-grained if anyone needs it */
  218.       options->MaxIfDepth = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
  219.       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
  220.       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
  221.       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
  222.  
  223.       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
  224.  
  225.       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
  226.                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
  227.       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
  228.                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
  229.       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
  230.                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
  231.       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
  232.                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
  233.  
  234.       if (pc->MaxNativeInstructions &&
  235.           (options->EmitNoIndirectUniform || pc->MaxUniformBlocks < 12)) {
  236.          can_ubo = FALSE;
  237.       }
  238.  
  239.       if (options->EmitNoLoops)
  240.          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
  241.       else
  242.          options->MaxUnrollIterations = 255; /* SM3 limit */
  243.       options->LowerClipDistance = true;
  244.    }
  245.  
  246.    /* This depends on program constants. */
  247.    c->MaxTextureCoordUnits
  248.       = _min(c->FragmentProgram.MaxTextureImageUnits, MAX_TEXTURE_COORD_UNITS);
  249.  
  250.    c->MaxTextureUnits = _min(c->FragmentProgram.MaxTextureImageUnits, c->MaxTextureCoordUnits);
  251.  
  252.    c->VertexProgram.MaxAttribs = MIN2(c->VertexProgram.MaxAttribs, 16);
  253.  
  254.    /* PIPE_SHADER_CAP_MAX_INPUTS for the FS specifies the maximum number
  255.     * of inputs. It's always 2 colors + N generic inputs. */
  256.    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
  257.                                             PIPE_SHADER_CAP_MAX_INPUTS);
  258.    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
  259.    c->MaxVaryingComponents = c->MaxVarying * 4;
  260.  
  261.    c->MinProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
  262.    c->MaxProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
  263.  
  264.    c->UniformBooleanTrue = ~0;
  265.  
  266.    c->MaxTransformFeedbackBuffers =
  267.       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS);
  268.    c->MaxTransformFeedbackBuffers = MIN2(c->MaxTransformFeedbackBuffers, MAX_FEEDBACK_BUFFERS);
  269.    c->MaxTransformFeedbackSeparateComponents =
  270.       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS);
  271.    c->MaxTransformFeedbackInterleavedComponents =
  272.       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS);
  273.  
  274.    c->StripTextureBorder = GL_TRUE;
  275.  
  276.    c->GLSLSkipStrictMaxUniformLimitCheck =
  277.       screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS);
  278.  
  279.    if (can_ubo) {
  280.       st->ctx->Extensions.ARB_uniform_buffer_object = GL_TRUE;
  281.       c->UniformBufferOffsetAlignment =
  282.          screen->get_param(screen, PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT);
  283.       c->MaxCombinedUniformBlocks = c->MaxUniformBufferBindings =
  284.          c->VertexProgram.MaxUniformBlocks +
  285.          c->GeometryProgram.MaxUniformBlocks +
  286.          c->FragmentProgram.MaxUniformBlocks;
  287.       assert(c->MaxCombinedUniformBlocks <= MAX_COMBINED_UNIFORM_BUFFERS);
  288.    }
  289. }
  290.  
  291.  
  292. /**
  293.  * Given a member \c x of struct gl_extensions, return offset of
  294.  * \c x in bytes.
  295.  */
  296. #define o(x) offsetof(struct gl_extensions, x)
  297.  
  298.  
  299. struct st_extension_cap_mapping {
  300.    int extension_offset;
  301.    int cap;
  302. };
  303.  
  304. struct st_extension_format_mapping {
  305.    int extension_offset[2];
  306.    enum pipe_format format[8];
  307.  
  308.    /* If TRUE, at least one format must be supported for the extensions to be
  309.     * advertised. If FALSE, all the formats must be supported. */
  310.    GLboolean need_at_least_one;
  311. };
  312.  
  313. /**
  314.  * Enable extensions if certain pipe formats are supported by the driver.
  315.  * What extensions will be enabled and what formats must be supported is
  316.  * described by the array of st_extension_format_mapping.
  317.  *
  318.  * target and bind_flags are passed to is_format_supported.
  319.  */
  320. static void init_format_extensions(struct st_context *st,
  321.                            const struct st_extension_format_mapping *mapping,
  322.                            unsigned num_mappings,
  323.                            enum pipe_texture_target target,
  324.                            unsigned bind_flags)
  325. {
  326.    struct pipe_screen *screen = st->pipe->screen;
  327.    GLboolean *extensions = (GLboolean *) &st->ctx->Extensions;
  328.    unsigned i;
  329.    int j;
  330.    int num_formats = Elements(mapping->format);
  331.    int num_ext = Elements(mapping->extension_offset);
  332.  
  333.    for (i = 0; i < num_mappings; i++) {
  334.       int num_supported = 0;
  335.  
  336.       /* Examine each format in the list. */
  337.       for (j = 0; j < num_formats && mapping[i].format[j]; j++) {
  338.          if (screen->is_format_supported(screen, mapping[i].format[j],
  339.                                          target, 0, bind_flags)) {
  340.             num_supported++;
  341.          }
  342.       }
  343.  
  344.       if (!num_supported ||
  345.           (!mapping[i].need_at_least_one && num_supported != j)) {
  346.          continue;
  347.       }
  348.  
  349.       /* Enable all extensions in the list. */
  350.       for (j = 0; j < num_ext && mapping[i].extension_offset[j]; j++)
  351.          extensions[mapping[i].extension_offset[j]] = GL_TRUE;
  352.    }
  353. }
  354.  
  355. /**
  356.  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
  357.  * which GL extensions are supported.
  358.  * Quite a few extensions are always supported because they are standard
  359.  * features or can be built on top of other gallium features.
  360.  * Some fine tuning may still be needed.
  361.  */
  362. void st_init_extensions(struct st_context *st)
  363. {
  364.    struct pipe_screen *screen = st->pipe->screen;
  365.    struct gl_context *ctx = st->ctx;
  366.    int i, glsl_feature_level;
  367.    GLboolean *extensions = (GLboolean *) &ctx->Extensions;
  368.  
  369.    static const struct st_extension_cap_mapping cap_mapping[] = {
  370.       { o(ARB_base_instance),                PIPE_CAP_START_INSTANCE                   },
  371.       { o(ARB_depth_clamp),                  PIPE_CAP_DEPTH_CLIP_DISABLE               },
  372.       { o(ARB_depth_texture),                PIPE_CAP_TEXTURE_SHADOW_MAP               },
  373.       { o(ARB_draw_buffers_blend),           PIPE_CAP_INDEP_BLEND_FUNC                 },
  374.       { o(ARB_draw_instanced),               PIPE_CAP_TGSI_INSTANCEID                  },
  375.       { o(ARB_fragment_program_shadow),      PIPE_CAP_TEXTURE_SHADOW_MAP               },
  376.       { o(ARB_instanced_arrays),             PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR  },
  377.       { o(ARB_occlusion_query),              PIPE_CAP_OCCLUSION_QUERY                  },
  378.       { o(ARB_occlusion_query2),             PIPE_CAP_OCCLUSION_QUERY                  },
  379.       { o(ARB_point_sprite),                 PIPE_CAP_POINT_SPRITE                     },
  380.       { o(ARB_seamless_cube_map),            PIPE_CAP_SEAMLESS_CUBE_MAP                },
  381.       { o(ARB_shader_stencil_export),        PIPE_CAP_SHADER_STENCIL_EXPORT            },
  382.       { o(ARB_shader_texture_lod),           PIPE_CAP_SM3                              },
  383.       { o(ARB_shadow),                       PIPE_CAP_TEXTURE_SHADOW_MAP               },
  384.       { o(ARB_texture_non_power_of_two),     PIPE_CAP_NPOT_TEXTURES                    },
  385.       { o(ARB_timer_query),                  PIPE_CAP_QUERY_TIMESTAMP                  },
  386.       { o(ARB_transform_feedback2),          PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME       },
  387.       { o(ARB_transform_feedback3),          PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME       },
  388.  
  389.       { o(EXT_blend_equation_separate),      PIPE_CAP_BLEND_EQUATION_SEPARATE          },
  390.       { o(EXT_draw_buffers2),                PIPE_CAP_INDEP_BLEND_ENABLE               },
  391.       { o(EXT_stencil_two_side),             PIPE_CAP_TWO_SIDED_STENCIL                },
  392.       { o(EXT_texture_array),                PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS         },
  393.       { o(EXT_texture_filter_anisotropic),   PIPE_CAP_ANISOTROPIC_FILTER               },
  394.       { o(EXT_texture_mirror_clamp),         PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
  395.       { o(EXT_texture_swizzle),              PIPE_CAP_TEXTURE_SWIZZLE                  },
  396.       { o(EXT_transform_feedback),           PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS        },
  397.  
  398.       { o(AMD_seamless_cubemap_per_texture), PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE    },
  399.       { o(ATI_separate_stencil),             PIPE_CAP_TWO_SIDED_STENCIL                },
  400.       { o(ATI_texture_mirror_once),          PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
  401.       { o(NV_conditional_render),            PIPE_CAP_CONDITIONAL_RENDER               },
  402.       { o(NV_texture_barrier),               PIPE_CAP_TEXTURE_BARRIER                  },
  403.       /* GL_NV_point_sprite is not supported by gallium because we don't
  404.        * support the GL_POINT_SPRITE_R_MODE_NV option. */
  405.       { o(MESA_texture_array),               PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS         },
  406.  
  407.       { o(OES_standard_derivatives),         PIPE_CAP_SM3                              },
  408.       { o(ARB_texture_cube_map_array),       PIPE_CAP_CUBE_MAP_ARRAY                   },
  409.       { o(ARB_texture_multisample),          PIPE_CAP_TEXTURE_MULTISAMPLE              }
  410.    };
  411.  
  412.    /* Required: render target and sampler support */
  413.    static const struct st_extension_format_mapping rendertarget_mapping[] = {
  414.       { { o(ARB_texture_float) },
  415.         { PIPE_FORMAT_R32G32B32A32_FLOAT,
  416.           PIPE_FORMAT_R16G16B16A16_FLOAT } },
  417.  
  418.       { { o(ARB_texture_rgb10_a2ui) },
  419.         { PIPE_FORMAT_B10G10R10A2_UINT } },
  420.  
  421.       { { o(EXT_framebuffer_sRGB) },
  422.         { PIPE_FORMAT_A8B8G8R8_SRGB,
  423.           PIPE_FORMAT_B8G8R8A8_SRGB },
  424.          GL_TRUE }, /* at least one format must be supported */
  425.  
  426.       { { o(EXT_packed_float) },
  427.         { PIPE_FORMAT_R11G11B10_FLOAT } },
  428.  
  429.       { { o(EXT_texture_integer) },
  430.         { PIPE_FORMAT_R32G32B32A32_UINT,
  431.           PIPE_FORMAT_R32G32B32A32_SINT } },
  432.  
  433.       { { o(ARB_texture_rg) },
  434.         { PIPE_FORMAT_R8_UNORM,
  435.           PIPE_FORMAT_R8G8_UNORM } },
  436.    };
  437.  
  438.    /* Required: depth stencil and sampler support */
  439.    static const struct st_extension_format_mapping depthstencil_mapping[] = {
  440.       { { o(ARB_depth_buffer_float) },
  441.         { PIPE_FORMAT_Z32_FLOAT,
  442.           PIPE_FORMAT_Z32_FLOAT_S8X24_UINT } },
  443.  
  444.       { { o(ARB_framebuffer_object),
  445.           o(EXT_packed_depth_stencil) },
  446.         { PIPE_FORMAT_S8_UINT_Z24_UNORM,
  447.           PIPE_FORMAT_Z24_UNORM_S8_UINT },
  448.         GL_TRUE }, /* at least one format must be supported */
  449.    };
  450.  
  451.    /* Required: sampler support */
  452.    static const struct st_extension_format_mapping texture_mapping[] = {
  453.       { { o(ARB_texture_compression_rgtc) },
  454.         { PIPE_FORMAT_RGTC1_UNORM,
  455.           PIPE_FORMAT_RGTC1_SNORM,
  456.           PIPE_FORMAT_RGTC2_UNORM,
  457.           PIPE_FORMAT_RGTC2_SNORM } },
  458.  
  459.       { { o(EXT_texture_compression_latc) },
  460.         { PIPE_FORMAT_LATC1_UNORM,
  461.           PIPE_FORMAT_LATC1_SNORM,
  462.           PIPE_FORMAT_LATC2_UNORM,
  463.           PIPE_FORMAT_LATC2_SNORM } },
  464.  
  465.       { { o(EXT_texture_compression_s3tc),
  466.           o(ANGLE_texture_compression_dxt) },
  467.         { PIPE_FORMAT_DXT1_RGB,
  468.           PIPE_FORMAT_DXT1_RGBA,
  469.           PIPE_FORMAT_DXT3_RGBA,
  470.           PIPE_FORMAT_DXT5_RGBA } },
  471.  
  472.       { { o(EXT_texture_shared_exponent) },
  473.         { PIPE_FORMAT_R9G9B9E5_FLOAT } },
  474.  
  475.       { { o(EXT_texture_snorm) },
  476.         { PIPE_FORMAT_R8G8B8A8_SNORM } },
  477.  
  478.       { { o(EXT_texture_sRGB),
  479.           o(EXT_texture_sRGB_decode) },
  480.         { PIPE_FORMAT_A8B8G8R8_SRGB,
  481.           PIPE_FORMAT_B8G8R8A8_SRGB },
  482.         GL_TRUE }, /* at least one format must be supported */
  483.  
  484.       { { o(ATI_texture_compression_3dc) },
  485.         { PIPE_FORMAT_LATC2_UNORM } },
  486.  
  487.       { { o(MESA_ycbcr_texture) },
  488.         { PIPE_FORMAT_UYVY,
  489.           PIPE_FORMAT_YUYV },
  490.         GL_TRUE }, /* at least one format must be supported */
  491.  
  492.       { { o(OES_compressed_ETC1_RGB8_texture) },
  493.         { PIPE_FORMAT_ETC1_RGB8 } },
  494.    };
  495.  
  496.    /* Required: vertex fetch support. */
  497.    static const struct st_extension_format_mapping vertex_mapping[] = {
  498.       { { o(ARB_vertex_type_2_10_10_10_rev) },
  499.         { PIPE_FORMAT_R10G10B10A2_UNORM,
  500.           PIPE_FORMAT_B10G10R10A2_UNORM,
  501.           PIPE_FORMAT_R10G10B10A2_SNORM,
  502.           PIPE_FORMAT_B10G10R10A2_SNORM,
  503.           PIPE_FORMAT_R10G10B10A2_USCALED,
  504.           PIPE_FORMAT_B10G10R10A2_USCALED,
  505.           PIPE_FORMAT_R10G10B10A2_SSCALED,
  506.           PIPE_FORMAT_B10G10R10A2_SSCALED } },
  507.    };
  508.  
  509.    static const struct st_extension_format_mapping tbo_rgb32[] = {
  510.       { {o(ARB_texture_buffer_object_rgb32) },
  511.         { PIPE_FORMAT_R32G32B32_FLOAT,
  512.           PIPE_FORMAT_R32G32B32_UINT,
  513.           PIPE_FORMAT_R32G32B32_SINT,
  514.         } },
  515.    };
  516.  
  517.    /*
  518.     * Extensions that are supported by all Gallium drivers:
  519.     */
  520.    ctx->Extensions.ARB_ES2_compatibility = GL_TRUE;
  521.    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
  522.    ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
  523.    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
  524.    ctx->Extensions.ARB_fragment_program = GL_TRUE;
  525.    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
  526.    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
  527.    ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
  528.    ctx->Extensions.ARB_internalformat_query = GL_TRUE;
  529.    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
  530.    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
  531.    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
  532.    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
  533.    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
  534.    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
  535.    ctx->Extensions.ARB_vertex_program = GL_TRUE;
  536.    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
  537.  
  538.    ctx->Extensions.EXT_blend_color = GL_TRUE;
  539.    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
  540.    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
  541.    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
  542.    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
  543.    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
  544.    ctx->Extensions.EXT_point_parameters = GL_TRUE;
  545.    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
  546.  
  547.    /* IMPORTANT:
  548.     *    Don't enable EXT_separate_shader_objects. It disallows a certain
  549.     *    optimization in the GLSL compiler and therefore is considered
  550.     *    harmful.
  551.     */
  552.    ctx->Extensions.EXT_separate_shader_objects = GL_FALSE;
  553.  
  554.    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
  555.    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
  556.  
  557.    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
  558.  
  559.    ctx->Extensions.MESA_pack_invert = GL_TRUE;
  560.  
  561.    ctx->Extensions.NV_fog_distance = GL_TRUE;
  562.    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
  563.    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
  564.  
  565.    ctx->Extensions.OES_EGL_image = GL_TRUE;
  566.    ctx->Extensions.OES_EGL_image_external = GL_TRUE;
  567.    ctx->Extensions.OES_draw_texture = GL_TRUE;
  568.  
  569.    /* Expose the extensions which directly correspond to gallium caps. */
  570.    for (i = 0; i < Elements(cap_mapping); i++) {
  571.       if (screen->get_param(screen, cap_mapping[i].cap)) {
  572.          extensions[cap_mapping[i].extension_offset] = GL_TRUE;
  573.       }
  574.    }
  575.  
  576.    /* Expose the extensions which directly correspond to gallium formats. */
  577.    init_format_extensions(st, rendertarget_mapping,
  578.                           Elements(rendertarget_mapping), PIPE_TEXTURE_2D,
  579.                           PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW);
  580.    init_format_extensions(st, depthstencil_mapping,
  581.                           Elements(depthstencil_mapping), PIPE_TEXTURE_2D,
  582.                           PIPE_BIND_DEPTH_STENCIL | PIPE_BIND_SAMPLER_VIEW);
  583.    init_format_extensions(st, texture_mapping, Elements(texture_mapping),
  584.                           PIPE_TEXTURE_2D, PIPE_BIND_SAMPLER_VIEW);
  585.    init_format_extensions(st, vertex_mapping, Elements(vertex_mapping),
  586.                           PIPE_BUFFER, PIPE_BIND_VERTEX_BUFFER);
  587.  
  588.    /* Figure out GLSL support. */
  589.    glsl_feature_level = screen->get_param(screen, PIPE_CAP_GLSL_FEATURE_LEVEL);
  590.  
  591.    if (glsl_feature_level >= 140) {
  592.       ctx->Const.GLSLVersion = 140;
  593.    } else if (glsl_feature_level >= 130) {
  594.       ctx->Const.GLSLVersion = 130;
  595.    } else {
  596.       ctx->Const.GLSLVersion = 120;
  597.    }
  598.  
  599.    _mesa_override_glsl_version(st->ctx);
  600.  
  601.    if (st->options.force_glsl_version > 0 &&
  602.        st->options.force_glsl_version <= ctx->Const.GLSLVersion) {
  603.       ctx->Const.ForceGLSLVersion = st->options.force_glsl_version;
  604.    }
  605.  
  606.    if (ctx->Const.GLSLVersion >= 130) {
  607.       ctx->Const.NativeIntegers = GL_TRUE;
  608.       ctx->Const.MaxClipPlanes = 8;
  609.  
  610.       /* Extensions that either depend on GLSL 1.30 or are a subset thereof. */
  611.       ctx->Extensions.ARB_conservative_depth = GL_TRUE;
  612.       ctx->Extensions.ARB_shading_language_packing = GL_TRUE;
  613.       ctx->Extensions.OES_depth_texture_cube_map = GL_TRUE;
  614.       ctx->Extensions.ARB_shading_language_420pack = GL_TRUE;
  615.  
  616.       if (!st->options.disable_shader_bit_encoding) {
  617.          ctx->Extensions.ARB_shader_bit_encoding = GL_TRUE;
  618.       }
  619.    } else {
  620.       /* Optional integer support for GLSL 1.2. */
  621.       if (screen->get_shader_param(screen, PIPE_SHADER_VERTEX,
  622.                                    PIPE_SHADER_CAP_INTEGERS) &&
  623.           screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
  624.                                    PIPE_SHADER_CAP_INTEGERS)) {
  625.          ctx->Const.NativeIntegers = GL_TRUE;
  626.       }
  627.    }
  628.  
  629.    /* Below are the cases which cannot be moved into tables easily. */
  630.  
  631.    if (!ctx->Mesa_DXTn && !st->options.force_s3tc_enable) {
  632.       ctx->Extensions.EXT_texture_compression_s3tc = GL_FALSE;
  633.       ctx->Extensions.ANGLE_texture_compression_dxt = GL_FALSE;
  634.    }
  635.  
  636.    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY,
  637.                                 PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
  638. #if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
  639.       ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
  640. #endif
  641.    }
  642.  
  643.    ctx->Extensions.NV_primitive_restart = GL_TRUE;
  644.    if (!screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
  645.       ctx->Const.PrimitiveRestartInSoftware = GL_TRUE;
  646.    }
  647.  
  648.    /* ARB_color_buffer_float. */
  649.    if (screen->get_param(screen, PIPE_CAP_VERTEX_COLOR_UNCLAMPED)) {
  650.       ctx->Extensions.ARB_color_buffer_float = GL_TRUE;
  651.  
  652.       if (!screen->get_param(screen, PIPE_CAP_VERTEX_COLOR_CLAMPED)) {
  653.          st->clamp_vert_color_in_shader = TRUE;
  654.       }
  655.  
  656.       if (!screen->get_param(screen, PIPE_CAP_FRAGMENT_COLOR_CLAMPED)) {
  657.          st->clamp_frag_color_in_shader = TRUE;
  658.       }
  659.  
  660.       /* For drivers which cannot do color clamping, it's better to just
  661.        * disable ARB_color_buffer_float in the core profile, because
  662.        * the clamping is deprecated there anyway. */
  663.       if (ctx->API == API_OPENGL_CORE &&
  664.           (st->clamp_frag_color_in_shader || st->clamp_vert_color_in_shader)) {
  665.          st->clamp_vert_color_in_shader = GL_FALSE;
  666.          st->clamp_frag_color_in_shader = GL_FALSE;
  667.          ctx->Extensions.ARB_color_buffer_float = GL_FALSE;
  668.       }
  669.    }
  670.  
  671.    if (screen->fence_finish) {
  672.       ctx->Extensions.ARB_sync = GL_TRUE;
  673.    }
  674.  
  675.    /* Maximum sample count. */
  676.    for (i = 16; i > 0; --i) {
  677.       enum pipe_format pformat = st_choose_format(st, GL_RGBA,
  678.                                                   GL_NONE, GL_NONE,
  679.                                                   PIPE_TEXTURE_2D, i,
  680.                                                   PIPE_BIND_RENDER_TARGET, FALSE);
  681.       if (pformat != PIPE_FORMAT_NONE) {
  682.          ctx->Const.MaxSamples = i;
  683.          ctx->Const.MaxColorTextureSamples = i;
  684.          break;
  685.       }
  686.    }
  687.    for (i = ctx->Const.MaxSamples; i > 0; --i) {
  688.       enum pipe_format pformat = st_choose_format(st, GL_DEPTH_STENCIL,
  689.                                                   GL_NONE, GL_NONE,
  690.                                                   PIPE_TEXTURE_2D, i,
  691.                                                   PIPE_BIND_DEPTH_STENCIL, FALSE);
  692.       if (pformat != PIPE_FORMAT_NONE) {
  693.          ctx->Const.MaxDepthTextureSamples = i;
  694.          break;
  695.       }
  696.    }
  697.    for (i = ctx->Const.MaxSamples; i > 0; --i) {
  698.       enum pipe_format pformat = st_choose_format(st, GL_RGBA_INTEGER,
  699.                                                   GL_NONE, GL_NONE,
  700.                                                   PIPE_TEXTURE_2D, i,
  701.                                                   PIPE_BIND_RENDER_TARGET, FALSE);
  702.       if (pformat != PIPE_FORMAT_NONE) {
  703.          ctx->Const.MaxIntegerSamples = i;
  704.          break;
  705.       }
  706.    }
  707.    if (ctx->Const.MaxSamples == 1) {
  708.       /* one sample doesn't really make sense */
  709.       ctx->Const.MaxSamples = 0;
  710.    }
  711.    else if (ctx->Const.MaxSamples >= 2) {
  712.       ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
  713.    }
  714.  
  715.    if (ctx->Const.MaxDualSourceDrawBuffers > 0 &&
  716.        !st->options.disable_blend_func_extended)
  717.       ctx->Extensions.ARB_blend_func_extended = GL_TRUE;
  718.  
  719.    st->has_time_elapsed =
  720.       screen->get_param(screen, PIPE_CAP_QUERY_TIME_ELAPSED);
  721.  
  722.    if (st->has_time_elapsed ||
  723.        ctx->Extensions.ARB_timer_query) {
  724.       ctx->Extensions.EXT_timer_query = GL_TRUE;
  725.    }
  726.  
  727.    if (ctx->Extensions.ARB_transform_feedback2 &&
  728.        ctx->Extensions.ARB_draw_instanced) {
  729.       ctx->Extensions.ARB_transform_feedback_instanced = GL_TRUE;
  730.    }
  731.    if (st->options.force_glsl_extensions_warn)
  732.       ctx->Const.ForceGLSLExtensionsWarn = 1;
  733.  
  734.    if (st->options.disable_glsl_line_continuations)
  735.       ctx->Const.DisableGLSLLineContinuations = 1;
  736.  
  737.    ctx->Const.MinMapBufferAlignment =
  738.       screen->get_param(screen, PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT);
  739.    if (ctx->Const.MinMapBufferAlignment >= 64) {
  740.       ctx->Extensions.ARB_map_buffer_alignment = GL_TRUE;
  741.    }
  742.    if (screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OBJECTS)) {
  743.       ctx->Extensions.ARB_texture_buffer_object = GL_TRUE;
  744.  
  745.       ctx->Const.MaxTextureBufferSize =
  746.          _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE),
  747.               (1u << 31) - 1);
  748.       ctx->Const.TextureBufferOffsetAlignment =
  749.          screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT);
  750.  
  751.       if (ctx->Const.TextureBufferOffsetAlignment)
  752.          ctx->Extensions.ARB_texture_buffer_range = GL_TRUE;
  753.  
  754.       init_format_extensions(st, tbo_rgb32, Elements(tbo_rgb32),
  755.                              PIPE_BUFFER, PIPE_BIND_SAMPLER_VIEW);
  756.    }
  757.  
  758.  
  759.    /* Unpacking a varying in the fragment shader costs 1 texture indirection.
  760.     * If the number of available texture indirections is very limited, then we
  761.     * prefer to disable varying packing rather than run the risk of varying
  762.     * packing preventing a shader from running.
  763.     */
  764.    if (screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
  765.                                 PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS) <= 8) {
  766.       /* We can't disable varying packing if transform feedback is available,
  767.        * because transform feedback code assumes a packed varying layout.
  768.        */
  769.       if (!ctx->Extensions.EXT_transform_feedback)
  770.          ctx->Const.DisableVaryingPacking = GL_TRUE;
  771.    }
  772. }
  773.