C++ GrGLContextInfo::glslGeneration方法代码示例

//.........这里部分代码省略.........
                             ctxInfo.hasExtension("GL_EXT_texture_storage");
    } else {
        // Qualcomm Adreno drivers appear to have issues with texture storage.
        fTexStorageSupport = (version >= GR_GL_VER(3,0) &&
                              kQualcomm_GrGLVendor != ctxInfo.vendor()) ||
                             ctxInfo.hasExtension("GL_EXT_texture_storage");
    }

    // ARB_texture_rg is part of OpenGL 3.0, but mesa doesn't support it if
    // it doesn't have ARB_texture_rg extension.
    if (kGL_GrGLStandard == standard) {
        if (ctxInfo.isMesa()) {
            fTextureRedSupport = ctxInfo.hasExtension("GL_ARB_texture_rg");
        } else {
            fTextureRedSupport = version >= GR_GL_VER(3,0) ||
                                 ctxInfo.hasExtension("GL_ARB_texture_rg");
        }
    } else {
        fTextureRedSupport =  version >= GR_GL_VER(3,0) ||
                              ctxInfo.hasExtension("GL_EXT_texture_rg");
    }

    fImagingSupport = kGL_GrGLStandard == standard &&
                      ctxInfo.hasExtension("GL_ARB_imaging");

    // ES 2 only guarantees RGBA/uchar + one other format/type combo for
    // ReadPixels. The other format has to checked at run-time since it
    // can change based on which render target is bound
    fTwoFormatLimit = kGLES_GrGLStandard == standard;

    // Known issue on at least some Intel platforms:
    // http://code.google.com/p/skia/issues/detail?id=946
    if (kIntel_GrGLVendor != ctxInfo.vendor()) {
        fFragCoordsConventionSupport = ctxInfo.glslGeneration() >= k150_GrGLSLGeneration ||
                                       ctxInfo.hasExtension("GL_ARB_fragment_coord_conventions");
    }

    // SGX and Mali GPUs that are based on a tiled-deferred architecture that have trouble with
    // frequently changing VBOs. We've measured a performance increase using non-VBO vertex
    // data for dynamic content on these GPUs. Perhaps we should read the renderer string and
    // limit this decision to specific GPU families rather than basing it on the vendor alone.
    if (!GR_GL_MUST_USE_VBO &&
        (kARM_GrGLVendor == ctxInfo.vendor() || kImagination_GrGLVendor == ctxInfo.vendor())) {
        fUseNonVBOVertexAndIndexDynamicData = true;
    }

    if ((kGL_GrGLStandard == standard && version >= GR_GL_VER(4,3)) ||
        (kGLES_GrGLStandard == standard && version >= GR_GL_VER(3,0)) ||
        ctxInfo.hasExtension("GL_ARB_invalidate_subdata")) {
        fDiscardRenderTargetSupport = true;
        fInvalidateFBType = kInvalidate_InvalidateFBType;
    } else if (ctxInfo.hasExtension("GL_EXT_discard_framebuffer")) {
        fDiscardRenderTargetSupport = true;
        fInvalidateFBType = kDiscard_InvalidateFBType;
    }

    if (kARM_GrGLVendor == ctxInfo.vendor() || kImagination_GrGLVendor == ctxInfo.vendor()) {
        fFullClearIsFree = true;
    }

    if (kGL_GrGLStandard == standard) {
        fVertexArrayObjectSupport = version >= GR_GL_VER(3, 0) ||
                                    ctxInfo.hasExtension("GL_ARB_vertex_array_object");
    } else {
        fVertexArrayObjectSupport = version >= GR_GL_VER(3, 0) ||
                                    ctxInfo.hasExtension("GL_OES_vertex_array_object");

void GrGLCaps::init(const GrGLContextInfo& ctxInfo) {

    this->reset();
    if (!ctxInfo.isInitialized()) {
        return;
    }

    const GrGLInterface* gli = ctxInfo.interface();
    GrGLBinding binding = ctxInfo.binding();
    GrGLVersion version = ctxInfo.version();

    if (kES2_GrGLBinding == binding) {
        GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_VECTORS,
                          &fMaxFragmentUniformVectors);
    } else {
        GrAssert(kDesktop_GrGLBinding == binding);
        GrGLint max;
        GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, &max);
        fMaxFragmentUniformVectors = max / 4;
    }
    GR_GL_GetIntegerv(gli, GR_GL_MAX_VERTEX_ATTRIBS, &fMaxVertexAttributes);

    if (kDesktop_GrGLBinding == binding) {
        fRGBA8RenderbufferSupport = true;
    } else {
        fRGBA8RenderbufferSupport = ctxInfo.hasExtension("GL_OES_rgb8_rgba8") ||
                                    ctxInfo.hasExtension("GL_ARM_rgba8");
    }

    if (kDesktop_GrGLBinding == binding) {
        fBGRAFormatSupport = version >= GR_GL_VER(1,2) ||
                             ctxInfo.hasExtension("GL_EXT_bgra");
    } else {
        if (ctxInfo.hasExtension("GL_APPLE_texture_format_BGRA8888")) {
            fBGRAFormatSupport = true;
        } else if (ctxInfo.hasExtension("GL_EXT_texture_format_BGRA8888")) {
            fBGRAFormatSupport = true;
            fBGRAIsInternalFormat = true;
        }
        GrAssert(fBGRAFormatSupport ||
                 kSkia8888_GrPixelConfig != kBGRA_8888_GrPixelConfig);
    }

    if (kDesktop_GrGLBinding == binding) {
        fTextureSwizzleSupport = version >= GR_GL_VER(3,3) ||
                                 ctxInfo.hasExtension("GL_ARB_texture_swizzle");
    } else {
        fTextureSwizzleSupport = false;
    }

    if (kDesktop_GrGLBinding == binding) {
        fUnpackRowLengthSupport = true;
        fUnpackFlipYSupport = false;
        fPackRowLengthSupport = true;
        fPackFlipYSupport = false;
    } else {
        fUnpackRowLengthSupport =ctxInfo.hasExtension("GL_EXT_unpack_subimage");
        fUnpackFlipYSupport = ctxInfo.hasExtension("GL_CHROMIUM_flipy");
        // no extension for pack row length
        fPackRowLengthSupport = false;
        fPackFlipYSupport =
            ctxInfo.hasExtension("GL_ANGLE_pack_reverse_row_order");
    }

    fTextureUsageSupport = (kES2_GrGLBinding == binding) &&
                            ctxInfo.hasExtension("GL_ANGLE_texture_usage");

    // Tex storage is in desktop 4.2 and can be an extension to desktop or ES.
    fTexStorageSupport = (kDesktop_GrGLBinding == binding &&
                          version >= GR_GL_VER(4,2)) ||
                         ctxInfo.hasExtension("GL_ARB_texture_storage") ||
                         ctxInfo.hasExtension("GL_EXT_texture_storage");

    // ARB_texture_rg is part of OpenGL 3.0
    if (kDesktop_GrGLBinding == binding) {
        fTextureRedSupport = version >= GR_GL_VER(3,0) ||
                             ctxInfo.hasExtension("GL_ARB_texture_rg");
    } else {
        fTextureRedSupport = ctxInfo.hasExtension("GL_EXT_texture_rg");
    }

    fImagingSupport = kDesktop_GrGLBinding == binding &&
                      ctxInfo.hasExtension("GL_ARB_imaging");

    // ES 2 only guarantees RGBA/uchar + one other format/type combo for
    // ReadPixels. The other format has to checked at run-time since it
    // can change based on which render target is bound
    fTwoFormatLimit = kES2_GrGLBinding == binding;

    // Known issue on at least some Intel platforms:
    // http://code.google.com/p/skia/issues/detail?id=946
    if (kIntel_GrGLVendor != ctxInfo.vendor()) {
        fFragCoordsConventionSupport = ctxInfo.glslGeneration() >= k150_GrGLSLGeneration ||
                                       ctxInfo.hasExtension("GL_ARB_fragment_coord_conventions");
    }

    this->initFSAASupport(ctxInfo);
    this->initStencilFormats(ctxInfo);
}

bool GrGLSLCaps::init(const GrGLContextInfo& ctxInfo,
                      const GrGLInterface* gli,
                      const GrGLCaps& glCaps) {
    this->reset();
    if (!ctxInfo.isInitialized()) {
        return false;
    }

    GrGLStandard standard = ctxInfo.standard();
    GrGLVersion version = ctxInfo.version();

    /**************************************************************************
    * Caps specific to GrGLSLCaps
    **************************************************************************/

    if (kGLES_GrGLStandard == standard) {
        if (ctxInfo.hasExtension("GL_EXT_shader_framebuffer_fetch")) {
            fFBFetchNeedsCustomOutput = (version >= GR_GL_VER(3, 0));
            fFBFetchSupport = true;
            fFBFetchColorName = "gl_LastFragData[0]";
            fFBFetchExtensionString = "GL_EXT_shader_framebuffer_fetch";
        }
        else if (ctxInfo.hasExtension("GL_NV_shader_framebuffer_fetch")) {
            // Actually, we haven't seen an ES3.0 device with this extension yet, so we don't know
            fFBFetchNeedsCustomOutput = false;
            fFBFetchSupport = true;
            fFBFetchColorName = "gl_LastFragData[0]";
            fFBFetchExtensionString = "GL_NV_shader_framebuffer_fetch";
        }
        else if (ctxInfo.hasExtension("GL_ARM_shader_framebuffer_fetch")) {
            // The arm extension also requires an additional flag which we will set onResetContext
            fFBFetchNeedsCustomOutput = false;
            fFBFetchSupport = true;
            fFBFetchColorName = "gl_LastFragColorARM";
            fFBFetchExtensionString = "GL_ARM_shader_framebuffer_fetch";
        }
    }

    // Adreno GPUs have a tendency to drop tiles when there is a divide-by-zero in a shader
    fDropsTileOnZeroDivide = kQualcomm_GrGLVendor == ctxInfo.vendor();

    /**************************************************************************
    * GrShaderCaps fields
    **************************************************************************/

    fPathRenderingSupport = ctxInfo.hasExtension("GL_NV_path_rendering");

    if (fPathRenderingSupport) {
        if (kGL_GrGLStandard == standard) {
            // We only support v1.3+ of GL_NV_path_rendering which allows us to
            // set individual fragment inputs with ProgramPathFragmentInputGen. The API
            // additions are detected by checking the existence of the function.
            fPathRenderingSupport = ctxInfo.hasExtension("GL_EXT_direct_state_access") &&
                                    ((ctxInfo.version() >= GR_GL_VER(4, 3) ||
                                      ctxInfo.hasExtension("GL_ARB_program_interface_query")) &&
                                     gli->fFunctions.fProgramPathFragmentInputGen);
        }
        else {
            fPathRenderingSupport = ctxInfo.version() >= GR_GL_VER(3, 1);
        }
    }

    // For now these two are equivalent but we could have dst read in shader via some other method
    fDstReadInShaderSupport = fFBFetchSupport;

    // Enable supported shader-related caps
    if (kGL_GrGLStandard == standard) {
        fDualSourceBlendingSupport = ctxInfo.version() >= GR_GL_VER(3, 3) ||
                                     ctxInfo.hasExtension("GL_ARB_blend_func_extended");
        fShaderDerivativeSupport = true;
        // we don't support GL_ARB_geometry_shader4, just GL 3.2+ GS
        fGeometryShaderSupport = ctxInfo.version() >= GR_GL_VER(3, 2) &&
                                 ctxInfo.glslGeneration() >= k150_GrGLSLGeneration;
    }
    else {
        fShaderDerivativeSupport = ctxInfo.version() >= GR_GL_VER(3, 0) ||
                                   ctxInfo.hasExtension("GL_OES_standard_derivatives");
    }

    if (glCaps.advancedBlendEquationSupport()) {
        bool coherent = glCaps.advancedCoherentBlendEquationSupport();
        if (ctxInfo.hasExtension(coherent ? "GL_NV_blend_equation_advanced_coherent"
                                 : "GL_NV_blend_equation_advanced")) {
            fAdvBlendEqInteraction = kAutomatic_AdvBlendEqInteraction;
        } else {
            fAdvBlendEqInteraction = kGeneralEnable_AdvBlendEqInteraction;
            // TODO: Use the following on any platform where "blend_support_all_equations" is slow.
            //fAdvBlendEqInteraction = kSpecificEnables_AdvBlendEqInteraction;
        }
    }

    this->initShaderPrecisionTable(ctxInfo, gli);

    return true;
}

void GrGLCaps::init(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {

    this->reset();
    if (!ctxInfo.isInitialized()) {
        return;
    }

    GrGLBinding binding = ctxInfo.binding();
    GrGLVersion version = ctxInfo.version();

    /**************************************************************************
     * Caps specific to GrGLCaps
     **************************************************************************/

    if (kES2_GrGLBinding == binding) {
        GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_VECTORS,
                          &fMaxFragmentUniformVectors);
    } else {
        GrAssert(kDesktop_GrGLBinding == binding);
        GrGLint max;
        GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, &max);
        fMaxFragmentUniformVectors = max / 4;
    }
    GR_GL_GetIntegerv(gli, GR_GL_MAX_VERTEX_ATTRIBS, &fMaxVertexAttributes);

    if (kDesktop_GrGLBinding == binding) {
        fRGBA8RenderbufferSupport = true;
    } else {
        fRGBA8RenderbufferSupport = ctxInfo.hasExtension("GL_OES_rgb8_rgba8") ||
                                    ctxInfo.hasExtension("GL_ARM_rgba8");
    }

    if (kDesktop_GrGLBinding == binding) {
        fBGRAFormatSupport = version >= GR_GL_VER(1,2) ||
                             ctxInfo.hasExtension("GL_EXT_bgra");
    } else {
        if (ctxInfo.hasExtension("GL_APPLE_texture_format_BGRA8888")) {
            fBGRAFormatSupport = true;
        } else if (ctxInfo.hasExtension("GL_EXT_texture_format_BGRA8888")) {
            fBGRAFormatSupport = true;
            fBGRAIsInternalFormat = true;
        }
        GrAssert(fBGRAFormatSupport ||
                 kSkia8888_GrPixelConfig != kBGRA_8888_GrPixelConfig);
    }

    if (kDesktop_GrGLBinding == binding) {
        fTextureSwizzleSupport = version >= GR_GL_VER(3,3) ||
                                 ctxInfo.hasExtension("GL_ARB_texture_swizzle");
    } else {
        fTextureSwizzleSupport = false;
    }

    if (kDesktop_GrGLBinding == binding) {
        fUnpackRowLengthSupport = true;
        fUnpackFlipYSupport = false;
        fPackRowLengthSupport = true;
        fPackFlipYSupport = false;
    } else {
        fUnpackRowLengthSupport =ctxInfo.hasExtension("GL_EXT_unpack_subimage");
        fUnpackFlipYSupport = ctxInfo.hasExtension("GL_CHROMIUM_flipy");
        // no extension for pack row length
        fPackRowLengthSupport = false;
        fPackFlipYSupport =
            ctxInfo.hasExtension("GL_ANGLE_pack_reverse_row_order");
    }

    fTextureUsageSupport = (kES2_GrGLBinding == binding) &&
                            ctxInfo.hasExtension("GL_ANGLE_texture_usage");

    // Tex storage is in desktop 4.2 and can be an extension to desktop or ES.
    fTexStorageSupport = (kDesktop_GrGLBinding == binding &&
                          version >= GR_GL_VER(4,2)) ||
                         ctxInfo.hasExtension("GL_ARB_texture_storage") ||
                         ctxInfo.hasExtension("GL_EXT_texture_storage");

    // ARB_texture_rg is part of OpenGL 3.0
    if (kDesktop_GrGLBinding == binding) {
        fTextureRedSupport = version >= GR_GL_VER(3,0) ||
                             ctxInfo.hasExtension("GL_ARB_texture_rg");
    } else {
        fTextureRedSupport = ctxInfo.hasExtension("GL_EXT_texture_rg");
    }

    fImagingSupport = kDesktop_GrGLBinding == binding &&
                      ctxInfo.hasExtension("GL_ARB_imaging");

    // ES 2 only guarantees RGBA/uchar + one other format/type combo for
    // ReadPixels. The other format has to checked at run-time since it
    // can change based on which render target is bound
    fTwoFormatLimit = kES2_GrGLBinding == binding;

    // Known issue on at least some Intel platforms:
    // http://code.google.com/p/skia/issues/detail?id=946
    if (kIntel_GrGLVendor != ctxInfo.vendor()) {
        fFragCoordsConventionSupport = ctxInfo.glslGeneration() >= k150_GrGLSLGeneration ||
                                       ctxInfo.hasExtension("GL_ARB_fragment_coord_conventions");
    }

    // SGX and Mali GPUs that are based on a tiled-deferred architecture that have trouble with
//.........这里部分代码省略.........