C++ GrGLContextInfo::renderer方法代码示例

//.........这里部分代码省略.........
        // ES3 has no limitations.
        fNPOTTextureTileSupport = ctxInfo.version() >= GR_GL_VER(3,0) ||
                                  ctxInfo.hasExtension("GL_OES_texture_npot");
        // ES2 supports MIP mapping for POT textures but our caps don't allow for limited MIP
        // support. The OES extension or ES 3.0 allow for MIPS on NPOT textures. So, apparently,
        // does the undocumented GL_IMG_texture_npot extension. This extension does not seem to
        // to alllow arbitrary wrap modes, however.
        fMipMapSupport = fNPOTTextureTileSupport || ctxInfo.hasExtension("GL_IMG_texture_npot");
    }

    GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_SIZE, &fMaxTextureSize);
    GR_GL_GetIntegerv(gli, GR_GL_MAX_RENDERBUFFER_SIZE, &fMaxRenderTargetSize);
    // Our render targets are always created with textures as the color
    // attachment, hence this min:
    fMaxRenderTargetSize = SkTMin(fMaxTextureSize, fMaxRenderTargetSize);

    fPathRenderingSupport = ctxInfo.hasExtension("GL_NV_path_rendering");

    if (fPathRenderingSupport) {
        if (kGL_GrGLStandard == standard) {
            // We need one of the two possible texturing methods: using fixed function pipeline
            // (PathTexGen, texcoords, ...)  or using the newer NVPR API additions that support
            // setting individual fragment inputs with ProgramPathFragmentInputGen. The API
            // additions are detected by checking the existence of the function. Eventually we may
            // choose to remove the fixed function codepath.
            // Set fMaxFixedFunctionTextureCoords = 0 here if you want to force
            // ProgramPathFragmentInputGen usage on desktop.
            fPathRenderingSupport = ctxInfo.hasExtension("GL_EXT_direct_state_access") &&
                (fMaxFixedFunctionTextureCoords > 0 ||
                 ((ctxInfo.version() >= GR_GL_VER(4,3) ||
                   ctxInfo.hasExtension("GL_ARB_program_interface_query")) &&
                  gli->fFunctions.fProgramPathFragmentInputGen));
            if (fPathRenderingSupport) {
                fNvprSupport = gli->fFunctions.fProgramPathFragmentInputGen ? kNormal_NvprSupport :
                                                                              kLegacy_NvprSupport;
            }
        } else {
            fPathRenderingSupport = ctxInfo.version() >= GR_GL_VER(3,1);
            fNvprSupport = fPathRenderingSupport ? kNormal_NvprSupport : kNone_NvprSupport;
        }
    } else {
        fNvprSupport = kNone_NvprSupport;
    }

    fFBMixedSamplesSupport = ctxInfo.hasExtension("GL_NV_framebuffer_mixed_samples");

    fGpuTracingSupport = ctxInfo.hasExtension("GL_EXT_debug_marker");

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

    // Disable scratch texture reuse on Mali and Adreno devices
    fReuseScratchTextures = kARM_GrGLVendor != ctxInfo.vendor() &&
                            kQualcomm_GrGLVendor != ctxInfo.vendor();

    // 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 (GrGLCaps::kES_IMG_MsToTexture_MSFBOType == fMSFBOType) {
        GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES_IMG, &fMaxSampleCount);
    } else if (GrGLCaps::kNone_MSFBOType != fMSFBOType) {
        GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES, &fMaxSampleCount);
    }

    if (kPowerVR54x_GrGLRenderer == ctxInfo.renderer() ||
        kPowerVRRogue_GrGLRenderer == ctxInfo.renderer() ||
        kAdreno3xx_GrGLRenderer == ctxInfo.renderer()) {
        fUseDrawInsteadOfClear = true;
    }

    if (kGL_GrGLStandard == standard) {
        // ARB allows mixed size FBO attachments, EXT does not.
        if (ctxInfo.version() >= GR_GL_VER(3, 0) ||
            ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
            fOversizedStencilSupport = true;
        } else {
            SkASSERT(ctxInfo.hasExtension("GL_EXT_framebuffer_object"));
        }
    } else {
        // ES 3.0 supports mixed size FBO attachments, 2.0 does not.
        fOversizedStencilSupport = ctxInfo.version() >= GR_GL_VER(3, 0);
    }

    this->initConfigTexturableTable(ctxInfo, gli);
    this->initConfigRenderableTable(ctxInfo);

    this->initShaderPrecisionTable(ctxInfo, gli);

    return true;
}

//.........这里部分代码省略.........
                ctxInfo.hasExtension("GL_NV_blend_equation_advanced_coherent")) {
            fBlendEquationSupport = kAdvancedCoherent_BlendEquationSupport;
        } else if (ctxInfo.hasExtension("GL_KHR_blend_equation_advanced") ||
                   ctxInfo.hasExtension("GL_NV_blend_equation_advanced")) {
            fBlendEquationSupport = kAdvanced_BlendEquationSupport;
        } else {
            fBlendEquationSupport = kBasic_BlendEquationSupport;
        }
    } else {
        // On Intel platforms, KHR_blend_equation_advanced is not conformant.
        fBlendEquationSupport = kBasic_BlendEquationSupport;
    }
#endif
    if (kGL_GrGLStandard == standard) {
        fMapBufferFlags = kCanMap_MapFlag; // we require VBO support and the desktop VBO
        // extension includes glMapBuffer.
        if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_ARB_map_buffer_range")) {
            fMapBufferFlags |= kSubset_MapFlag;
            fMapBufferType = kMapBufferRange_MapBufferType;
        } else {
            fMapBufferType = kMapBuffer_MapBufferType;
        }
    } else {
        // Unextended GLES2 doesn't have any buffer mapping.
        fMapBufferFlags = kNone_MapBufferType;
        if (ctxInfo.hasExtension("GL_CHROMIUM_map_sub")) {
            fMapBufferFlags = kCanMap_MapFlag | kSubset_MapFlag;
            fMapBufferType = kChromium_MapBufferType;
        } else if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_EXT_map_buffer_range")) {
            fMapBufferFlags = kCanMap_MapFlag | kSubset_MapFlag;
            fMapBufferType = kMapBufferRange_MapBufferType;
        } else if (ctxInfo.hasExtension("GL_OES_mapbuffer")) {
            fMapBufferFlags = kCanMap_MapFlag;
            fMapBufferType = kMapBuffer_MapBufferType;
        }
    }

    if (kGL_GrGLStandard == standard) {
        SkASSERT(ctxInfo.version() >= GR_GL_VER(2,0) ||
                 ctxInfo.hasExtension("GL_ARB_texture_non_power_of_two"));
        fNPOTTextureTileSupport = true;
        fMipMapSupport = true;
    } else {
        // Unextended ES2 supports NPOT textures with clamp_to_edge and non-mip filters only
        // ES3 has no limitations.
        fNPOTTextureTileSupport = ctxInfo.version() >= GR_GL_VER(3,0) ||
                                  ctxInfo.hasExtension("GL_OES_texture_npot");
        // ES2 supports MIP mapping for POT textures but our caps don't allow for limited MIP
        // support. The OES extension or ES 3.0 allow for MIPS on NPOT textures. So, apparently,
        // does the undocumented GL_IMG_texture_npot extension. This extension does not seem to
        // to alllow arbitrary wrap modes, however.
        fMipMapSupport = fNPOTTextureTileSupport || ctxInfo.hasExtension("GL_IMG_texture_npot");
    }

    GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_SIZE, &fMaxTextureSize);
    GR_GL_GetIntegerv(gli, GR_GL_MAX_RENDERBUFFER_SIZE, &fMaxRenderTargetSize);
    // Our render targets are always created with textures as the color
    // attachment, hence this min:
    fMaxRenderTargetSize = SkTMin(fMaxTextureSize, fMaxRenderTargetSize);

    fFBMixedSamplesSupport = ctxInfo.hasExtension("GL_NV_framebuffer_mixed_samples");

    fGpuTracingSupport = ctxInfo.hasExtension("GL_EXT_debug_marker");

    // Disable scratch texture reuse on Mali and Adreno devices
    fReuseScratchTextures = kARM_GrGLVendor != ctxInfo.vendor() &&
                            kQualcomm_GrGLVendor != ctxInfo.vendor();

    if (GrGLCaps::kES_IMG_MsToTexture_MSFBOType == fMSFBOType) {
        GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES_IMG, &fMaxSampleCount);
    } else if (GrGLCaps::kNone_MSFBOType != fMSFBOType) {
        GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES, &fMaxSampleCount);
    }

    if (kPowerVR54x_GrGLRenderer == ctxInfo.renderer() ||
            kPowerVRRogue_GrGLRenderer == ctxInfo.renderer() ||
            kAdreno3xx_GrGLRenderer == ctxInfo.renderer()) {
        fUseDrawInsteadOfClear = true;
    }

    if (kGL_GrGLStandard == standard) {
        // ARB allows mixed size FBO attachments, EXT does not.
        if (ctxInfo.version() >= GR_GL_VER(3, 0) ||
                ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
            fOversizedStencilSupport = true;
        } else {
            SkASSERT(ctxInfo.hasExtension("GL_EXT_framebuffer_object"));
        }
    } else {
        // ES 3.0 supports mixed size FBO attachments, 2.0 does not.
        fOversizedStencilSupport = ctxInfo.version() >= GR_GL_VER(3, 0);
    }

    this->initConfigTexturableTable(ctxInfo, gli);
    this->initConfigRenderableTable(ctxInfo);

    reinterpret_cast<GrGLSLCaps*>(fShaderCaps.get())->init(ctxInfo, gli, *this);

    return true;
}