bool RendererD3D::skipDraw(const gl::State &glState, gl::PrimitiveMode drawMode)
{
    if (drawMode == gl::PrimitiveMode::Points)
    {
        bool usesPointSize = GetImplAs<ProgramD3D>(glState.getProgram())->usesPointSize();

        // ProgramBinary assumes non-point rendering if gl_PointSize isn't written,
        // which affects varying interpolation. Since the value of gl_PointSize is
        // undefined when not written, just skip drawing to avoid unexpected results.
        if (!usesPointSize && !glState.isTransformFeedbackActiveUnpaused())
        {
            // Notify developers of risking undefined behavior.
            WARN() << "Point rendering without writing to gl_PointSize.";
            return true;
        }
    }
    else if (gl::IsTriangleMode(drawMode))
    {
        if (glState.getRasterizerState().cullFace &&
            glState.getRasterizerState().cullMode == gl::CullFaceMode::FrontAndBack)
        {
            return true;
        }
    }

    return false;
}

gl::Error StateManager11::updateCurrentValueAttribs(const gl::State &state,
                                                    VertexDataManager *vertexDataManager)
{
    const auto &activeAttribsMask  = state.getProgram()->getActiveAttribLocationsMask();
    const auto &dirtyActiveAttribs = (activeAttribsMask & mDirtyCurrentValueAttribs);
    const auto &vertexAttributes   = state.getVertexArray()->getVertexAttributes();

    for (auto attribIndex : angle::IterateBitSet(dirtyActiveAttribs))
    {
        if (vertexAttributes[attribIndex].enabled)
            continue;

        mDirtyCurrentValueAttribs.reset(attribIndex);

        const auto &currentValue =
            state.getVertexAttribCurrentValue(static_cast<unsigned int>(attribIndex));
        auto currentValueAttrib              = &mCurrentValueAttribs[attribIndex];
        currentValueAttrib->currentValueType = currentValue.Type;
        currentValueAttrib->attribute        = &vertexAttributes[attribIndex];

        gl::Error error = vertexDataManager->storeCurrentValue(currentValue, currentValueAttrib,
                                                               static_cast<size_t>(attribIndex));
        if (error.isError())
        {
            return error;
        }
    }

    return gl::Error(GL_NO_ERROR);
}

void StateManagerGL::setClearState(const gl::State &state, GLbitfield mask)
{
    // Only apply the state required to do a clear
    setScissor(state.getScissor());
    setViewport(state.getViewport());

    if ((mask & GL_COLOR_BUFFER_BIT) != 0)
    {
        setClearColor(state.getColorClearValue());

        const gl::BlendState &blendState = state.getBlendState();
        setColorMask(blendState.colorMaskRed, blendState.colorMaskGreen, blendState.colorMaskBlue, blendState.colorMaskAlpha);
    }

    if ((mask & GL_DEPTH_BUFFER_BIT) != 0)
    {
        setClearDepth(state.getDepthClearValue());
        setDepthMask(state.getDepthStencilState().depthMask);
    }

    if ((mask & GL_STENCIL_BUFFER_BIT) != 0)
    {
        setClearStencil(state.getStencilClearValue());
        setStencilMask(state.getDepthStencilState().stencilMask);
    }
}

void VertexArray11::clearDirtyAndPromoteDynamicAttribs(const gl::State &state, GLsizei count)
{
    const gl::Program *program  = state.getProgram();
    const auto &activeLocations = program->getActiveAttribLocationsMask();
    mAttribsToUpdate &= ~activeLocations;

    // Promote to static after we clear the dirty attributes, otherwise we can lose dirtyness.
    auto activeDynamicAttribs = (mDynamicAttribsMask & activeLocations);
    VertexDataManager::PromoteDynamicAttribs(mTranslatedAttribs, activeDynamicAttribs, count);
}

gl::Error FramebufferD3D::blit(const gl::State &state, const gl::Rectangle &sourceArea, const gl::Rectangle &destArea,
                               GLbitfield mask, GLenum filter, const gl::Framebuffer *sourceFramebuffer)
{
    bool blitRenderTarget = false;
    if ((mask & GL_COLOR_BUFFER_BIT) &&
        sourceFramebuffer->getReadColorbuffer() != nullptr &&
        mData.getFirstColorAttachment() != nullptr)
    {
        blitRenderTarget = true;
    }

    bool blitStencil = false;
    if ((mask & GL_STENCIL_BUFFER_BIT) &&
        sourceFramebuffer->getStencilbuffer() != nullptr &&
        mData.mStencilAttachment != nullptr)
    {
        blitStencil = true;
    }

    bool blitDepth = false;
    if ((mask & GL_DEPTH_BUFFER_BIT) &&
        sourceFramebuffer->getDepthbuffer() != nullptr &&
        mData.mDepthAttachment != nullptr)
    {
        blitDepth = true;
    }

    if (blitRenderTarget || blitDepth || blitStencil)
    {
        const gl::Rectangle *scissor = state.isScissorTestEnabled() ? &state.getScissor() : NULL;
        gl::Error error = blit(sourceArea, destArea, scissor, blitRenderTarget, blitDepth, blitStencil,
                               filter, sourceFramebuffer);
        if (error.isError())
        {
            return error;
        }
    }

    return gl::Error(GL_NO_ERROR);
}

unsigned int GetBlendSampleMask(const gl::State &glState, int samples)
{
    unsigned int mask = 0;
    if (glState.isSampleCoverageEnabled())
    {
        GLfloat coverageValue = glState.getSampleCoverageValue();
        if (coverageValue != 0)
        {
            float threshold = 0.5f;

            for (int i = 0; i < samples; ++i)
            {
                mask <<= 1;

                if ((i + 1) * coverageValue >= threshold)
                {
                    threshold += 1.0f;
                    mask |= 1;
                }
            }
        }

        bool coverageInvert = glState.getSampleCoverageInvert();
        if (coverageInvert)
        {
            mask = ~mask;
        }
    }
    else
    {
        mask = 0xFFFFFFFF;
    }

    if (glState.isSampleMaskEnabled())
    {
        mask &= glState.getSampleMaskWord(0);
    }

    return mask;
}

gl::Error FramebufferGL::readPixels(const gl::State &state, const gl::Rectangle &area, GLenum format, GLenum type, GLvoid *pixels) const
{
    const gl::PixelPackState &packState = state.getPackState();
    if (packState.pixelBuffer.get() != nullptr)
    {
        UNIMPLEMENTED();
    }

    mStateManager->bindFramebuffer(GL_READ_FRAMEBUFFER, mFramebufferID);
    mFunctions->readPixels(area.x, area.y, area.width, area.height, format, type, pixels);

    return gl::Error(GL_NO_ERROR);
}

gl::Error FramebufferD3D::readPixels(const gl::State &state, const gl::Rectangle &area, GLenum format, GLenum type, GLvoid *pixels) const
{
    const gl::PixelPackState &packState = state.getPackState();

    GLenum sizedInternalFormat = gl::GetSizedInternalFormat(format, type);
    const gl::InternalFormat &sizedFormatInfo = gl::GetInternalFormatInfo(sizedInternalFormat);
    GLuint outputPitch =
        sizedFormatInfo.computeRowPitch(type, area.width, packState.alignment, packState.rowLength);
    GLsizei outputSkipBytes = sizedFormatInfo.computeSkipPixels(
        outputPitch, 0, 0, packState.skipRows, packState.skipPixels);

    return readPixelsImpl(area, format, type, outputPitch, packState,
                          reinterpret_cast<uint8_t *>(pixels) + outputSkipBytes);
}

void VertexArray11::flushAttribUpdates(const gl::State &state)
{
    const gl::Program *program  = state.getProgram();
    const auto &activeLocations = program->getActiveAttribLocationsMask();

    if (mAttribsToUpdate.any())
    {
        // Skip attrib locations the program doesn't use.
        gl::AttributesMask activeToUpdate = mAttribsToUpdate & activeLocations;

        for (auto toUpdateIndex : activeToUpdate)
        {
            mAttribsToUpdate.reset(toUpdateIndex);
            updateVertexAttribStorage(toUpdateIndex);
        }
    }
}

void StateManagerGL::syncState(const gl::State &state, const gl::State::DirtyBits &dirtyBits)
{
    // TODO(jmadill): Investigate only syncing vertex state for active attributes
    for (auto dirtyBit : angle::IterateBitSet(dirtyBits | mLocalDirtyBits))
    {
        switch (dirtyBit)
        {
            case gl::State::DIRTY_BIT_SCISSOR_TEST_ENABLED:
                setScissorTestEnabled(state.isScissorTestEnabled());
                break;
            case gl::State::DIRTY_BIT_SCISSOR:
                setScissor(state.getScissor());
                break;
            case gl::State::DIRTY_BIT_VIEWPORT:
                setViewport(state.getViewport());
                break;
            case gl::State::DIRTY_BIT_DEPTH_RANGE:
                setDepthRange(state.getNearPlane(), state.getFarPlane());
                break;
            case gl::State::DIRTY_BIT_BLEND_ENABLED:
                setBlendEnabled(state.isBlendEnabled());
                break;
            case gl::State::DIRTY_BIT_BLEND_COLOR:
                setBlendColor(state.getBlendColor());
                break;
            case gl::State::DIRTY_BIT_BLEND_FUNCS:
            {
                const auto &blendState = state.getBlendState();
                setBlendFuncs(blendState.sourceBlendRGB, blendState.destBlendRGB,
                              blendState.sourceBlendAlpha, blendState.destBlendAlpha);
                break;
            }
            case gl::State::DIRTY_BIT_BLEND_EQUATIONS:
            {
                const auto &blendState = state.getBlendState();
                setBlendEquations(blendState.blendEquationRGB, blendState.blendEquationAlpha);
                break;
            }
            case gl::State::DIRTY_BIT_COLOR_MASK:
            {
                const auto &blendState = state.getBlendState();
                setColorMask(blendState.colorMaskRed, blendState.colorMaskGreen,
                             blendState.colorMaskBlue, blendState.colorMaskAlpha);
                break;
            }
            case gl::State::DIRTY_BIT_SAMPLE_ALPHA_TO_COVERAGE_ENABLED:
                setSampleAlphaToCoverageEnabled(state.isSampleAlphaToCoverageEnabled());
                break;
            case gl::State::DIRTY_BIT_SAMPLE_COVERAGE_ENABLED:
                setSampleCoverageEnabled(state.isSampleCoverageEnabled());
                break;
            case gl::State::DIRTY_BIT_SAMPLE_COVERAGE:
                setSampleCoverage(state.getSampleCoverageValue(), state.getSampleCoverageInvert());
                break;
            case gl::State::DIRTY_BIT_DEPTH_TEST_ENABLED:
                setDepthTestEnabled(state.isDepthTestEnabled());
                break;
            case gl::State::DIRTY_BIT_DEPTH_FUNC:
                setDepthFunc(state.getDepthStencilState().depthFunc);
                break;
            case gl::State::DIRTY_BIT_DEPTH_MASK:
                setDepthMask(state.getDepthStencilState().depthMask);
                break;
            case gl::State::DIRTY_BIT_STENCIL_TEST_ENABLED:
                setStencilTestEnabled(state.isStencilTestEnabled());
                break;
            case gl::State::DIRTY_BIT_STENCIL_FUNCS_FRONT:
            {
                const auto &depthStencilState = state.getDepthStencilState();
                setStencilFrontFuncs(depthStencilState.stencilFunc, state.getStencilRef(),
                                     depthStencilState.stencilMask);
                break;
            }
            case gl::State::DIRTY_BIT_STENCIL_FUNCS_BACK:
            {
                const auto &depthStencilState = state.getDepthStencilState();
                setStencilBackFuncs(depthStencilState.stencilBackFunc, state.getStencilBackRef(),
                                    depthStencilState.stencilBackMask);
                break;
            }
            case gl::State::DIRTY_BIT_STENCIL_OPS_FRONT:
            {
                const auto &depthStencilState = state.getDepthStencilState();
                setStencilFrontOps(depthStencilState.stencilFail,
                                   depthStencilState.stencilPassDepthFail,
                                   depthStencilState.stencilPassDepthPass);
                break;
            }
            case gl::State::DIRTY_BIT_STENCIL_OPS_BACK:
            {
                const auto &depthStencilState = state.getDepthStencilState();
                setStencilBackOps(depthStencilState.stencilBackFail,
                                  depthStencilState.stencilBackPassDepthFail,
                                  depthStencilState.stencilBackPassDepthPass);
                break;
            }
            case gl::State::DIRTY_BIT_STENCIL_WRITEMASK_FRONT:
                setStencilFrontWritemask(state.getDepthStencilState().stencilWritemask);
                break;
            case gl::State::DIRTY_BIT_STENCIL_WRITEMASK_BACK:
//.........这里部分代码省略.........

gl::Error VertexDataManager::prepareVertexData(const gl::State &state, GLint start, GLsizei count,
                                               TranslatedAttribute *translated, GLsizei instances)
{
    if (!mStreamingBuffer)
    {
        return gl::Error(GL_OUT_OF_MEMORY, "Internal streaming vertex buffer is unexpectedly NULL.");
    }

    // Invalidate static buffers that don't contain matching attributes
    for (int attributeIndex = 0; attributeIndex < gl::MAX_VERTEX_ATTRIBS; attributeIndex++)
    {
        translated[attributeIndex].active = (state.getProgram()->getSemanticIndex(attributeIndex) != -1);
        const gl::VertexAttribute &curAttrib = state.getVertexAttribState(attributeIndex);

        if (translated[attributeIndex].active && curAttrib.enabled)
        {
            invalidateMatchingStaticData(curAttrib, state.getVertexAttribCurrentValue(attributeIndex));
        }
    }

    // Reserve the required space in the buffers
    for (int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
    {
        const gl::VertexAttribute &curAttrib = state.getVertexAttribState(i);
        if (translated[i].active && curAttrib.enabled)
        {
            gl::Error error = reserveSpaceForAttrib(curAttrib, state.getVertexAttribCurrentValue(i), count, instances);
            if (error.isError())
            {
                return error;
            }
        }
    }

    // Perform the vertex data translations
    for (int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
    {
        const gl::VertexAttribute &curAttrib = state.getVertexAttribState(i);
        if (translated[i].active)
        {
            if (curAttrib.enabled)
            {
                gl::Error error = storeAttribute(curAttrib, state.getVertexAttribCurrentValue(i),
                                                 &translated[i], start, count, instances);

                if (error.isError())
                {
                    return error;
                }
            }
            else
            {
                if (!mCurrentValueBuffer[i])
                {
                    mCurrentValueBuffer[i] = new StreamingVertexBufferInterface(mRenderer, CONSTANT_VERTEX_BUFFER_SIZE);
                }

                gl::Error error = storeCurrentValue(curAttrib, state.getVertexAttribCurrentValue(i), &translated[i],
                                                    &mCurrentValue[i], &mCurrentValueOffsets[i],
                                                    mCurrentValueBuffer[i]);
                if (error.isError())
                {
                    return error;
                }
            }
        }
    }

    for (int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
    {
        const gl::VertexAttribute &curAttrib = state.getVertexAttribState(i);
        if (translated[i].active && curAttrib.enabled)
        {
            gl::Buffer *buffer = curAttrib.buffer.get();

            if (buffer)
            {
                BufferD3D *bufferImpl = BufferD3D::makeBufferD3D(buffer->getImplementation());
                bufferImpl->promoteStaticUsage(count * ComputeVertexAttributeTypeSize(curAttrib));
            }
        }
    }

    return gl::Error(GL_NO_ERROR);
}

void StateManager9::syncState(const gl::State &state, const gl::State::DirtyBits &dirtyBits)
{
    for (auto dirtyBit : angle::IterateBitSet(dirtyBits))
    {
        switch (dirtyBit)
        {
            case gl::State::DIRTY_BIT_BLEND_ENABLED:
                if (state.getBlendState().blend != mCurBlendState.blend)
                {
                    mDirtyBits.set(DIRTY_BIT_BLEND_ENABLED);
                    // BlendColor and funcs and equations has to be set if blend is enabled
                    mDirtyBits.set(DIRTY_BIT_BLEND_COLOR);
                    mDirtyBits.set(DIRTY_BIT_BLEND_FUNCS_EQUATIONS);
                }
                break;
            case gl::State::DIRTY_BIT_BLEND_FUNCS:
            {
                const gl::BlendState &blendState = state.getBlendState();
                if (blendState.sourceBlendRGB != mCurBlendState.sourceBlendRGB ||
                    blendState.destBlendRGB != mCurBlendState.destBlendRGB ||
                    blendState.sourceBlendAlpha != mCurBlendState.sourceBlendAlpha ||
                    blendState.destBlendAlpha != mCurBlendState.destBlendAlpha)
                {
                    mDirtyBits.set(DIRTY_BIT_BLEND_FUNCS_EQUATIONS);
                    // BlendColor depends on the values of blend funcs
                    mDirtyBits.set(DIRTY_BIT_BLEND_COLOR);
                }
                break;
            }
            case gl::State::DIRTY_BIT_BLEND_EQUATIONS:
            {
                const gl::BlendState &blendState = state.getBlendState();
                if (blendState.blendEquationRGB != mCurBlendState.blendEquationRGB ||
                    blendState.blendEquationAlpha != mCurBlendState.blendEquationAlpha)
                {
                    mDirtyBits.set(DIRTY_BIT_BLEND_FUNCS_EQUATIONS);
                }
                break;
            }
            case gl::State::DIRTY_BIT_SAMPLE_ALPHA_TO_COVERAGE_ENABLED:
                if (state.getBlendState().sampleAlphaToCoverage !=
                    mCurBlendState.sampleAlphaToCoverage)
                {
                    mDirtyBits.set(DIRTY_BIT_SAMPLE_ALPHA_TO_COVERAGE);
                }
                break;
            case gl::State::DIRTY_BIT_COLOR_MASK:
            {
                const gl::BlendState &blendState = state.getBlendState();
                if (blendState.colorMaskRed != mCurBlendState.colorMaskRed ||
                    blendState.colorMaskGreen != mCurBlendState.colorMaskGreen ||
                    blendState.colorMaskBlue != mCurBlendState.colorMaskBlue ||
                    blendState.colorMaskAlpha != mCurBlendState.colorMaskAlpha)
                {
                    mDirtyBits.set(DIRTY_BIT_COLOR_MASK);
                }
                break;
            }
            case gl::State::DIRTY_BIT_DITHER_ENABLED:
                if (state.getBlendState().dither != mCurBlendState.dither)
                {
                    mDirtyBits.set(DIRTY_BIT_DITHER);
                }
                break;
            case gl::State::DIRTY_BIT_BLEND_COLOR:
                if (state.getBlendColor() != mCurBlendColor)
                {
                    mDirtyBits.set(DIRTY_BIT_BLEND_COLOR);
                }
                break;
            case gl::State::DIRTY_BIT_CULL_FACE_ENABLED:
                if (state.getRasterizerState().cullFace != mCurRasterState.cullFace)
                {
                    mDirtyBits.set(DIRTY_BIT_CULL_MODE);
                }
                break;
            case gl::State::DIRTY_BIT_CULL_FACE:
                if (state.getRasterizerState().cullMode != mCurRasterState.cullMode)
                {
                    mDirtyBits.set(DIRTY_BIT_CULL_MODE);
                }
                break;
            case gl::State::DIRTY_BIT_FRONT_FACE:
                if (state.getRasterizerState().frontFace != mCurRasterState.frontFace)
                {
                    mDirtyBits.set(DIRTY_BIT_CULL_MODE);

                    // Viewport state depends on rasterizer.frontface
                    mDirtyBits.set(DIRTY_BIT_VIEWPORT);
                }
                break;
            case gl::State::DIRTY_BIT_POLYGON_OFFSET_FILL_ENABLED:
                if (state.getRasterizerState().polygonOffsetFill !=
                    mCurRasterState.polygonOffsetFill)
                {
                    mDirtyBits.set(DIRTY_BIT_DEPTH_BIAS);
                }
                break;
            case gl::State::DIRTY_BIT_POLYGON_OFFSET:
            {
//.........这里部分代码省略.........

void StateManager11::syncState(const gl::State &state, const gl::State::DirtyBits &dirtyBits)
{
    if (!dirtyBits.any())
    {
        return;
    }

    for (auto dirtyBit : angle::IterateBitSet(dirtyBits))
    {
        switch (dirtyBit)
        {
            case gl::State::DIRTY_BIT_BLEND_EQUATIONS:
            {
                const gl::BlendState &blendState = state.getBlendState();
                if (blendState.blendEquationRGB != mCurBlendState.blendEquationRGB ||
                    blendState.blendEquationAlpha != mCurBlendState.blendEquationAlpha)
                {
                    mBlendStateIsDirty = true;
                }
                break;
            }
            case gl::State::DIRTY_BIT_BLEND_FUNCS:
            {
                const gl::BlendState &blendState = state.getBlendState();
                if (blendState.sourceBlendRGB != mCurBlendState.sourceBlendRGB ||
                    blendState.destBlendRGB != mCurBlendState.destBlendRGB ||
                    blendState.sourceBlendAlpha != mCurBlendState.sourceBlendAlpha ||
                    blendState.destBlendAlpha != mCurBlendState.destBlendAlpha)
                {
                    mBlendStateIsDirty = true;
                }
                break;
            }
            case gl::State::DIRTY_BIT_BLEND_ENABLED:
                if (state.getBlendState().blend != mCurBlendState.blend)
                {
                    mBlendStateIsDirty = true;
                }
                break;
            case gl::State::DIRTY_BIT_SAMPLE_ALPHA_TO_COVERAGE_ENABLED:
                if (state.getBlendState().sampleAlphaToCoverage !=
                    mCurBlendState.sampleAlphaToCoverage)
                {
                    mBlendStateIsDirty = true;
                }
                break;
            case gl::State::DIRTY_BIT_DITHER_ENABLED:
                if (state.getBlendState().dither != mCurBlendState.dither)
                {
                    mBlendStateIsDirty = true;
                }
                break;
            case gl::State::DIRTY_BIT_COLOR_MASK:
            {
                const gl::BlendState &blendState = state.getBlendState();
                if (blendState.colorMaskRed != mCurBlendState.colorMaskRed ||
                    blendState.colorMaskGreen != mCurBlendState.colorMaskGreen ||
                    blendState.colorMaskBlue != mCurBlendState.colorMaskBlue ||
                    blendState.colorMaskAlpha != mCurBlendState.colorMaskAlpha)
                {
                    mBlendStateIsDirty = true;
                }
                break;
            }
            case gl::State::DIRTY_BIT_BLEND_COLOR:
                if (state.getBlendColor() != mCurBlendColor)
                {
                    mBlendStateIsDirty = true;
                }
                break;
            case gl::State::DIRTY_BIT_DEPTH_MASK:
                if (state.getDepthStencilState().depthMask != mCurDepthStencilState.depthMask)
                {
                    mDepthStencilStateIsDirty = true;
                }
                break;
            case gl::State::DIRTY_BIT_DEPTH_TEST_ENABLED:
                if (state.getDepthStencilState().depthTest != mCurDepthStencilState.depthTest)
                {
                    mDepthStencilStateIsDirty = true;
                }
                break;
            case gl::State::DIRTY_BIT_DEPTH_FUNC:
                if (state.getDepthStencilState().depthFunc != mCurDepthStencilState.depthFunc)
                {
                    mDepthStencilStateIsDirty = true;
                }
                break;
            case gl::State::DIRTY_BIT_STENCIL_TEST_ENABLED:
                if (state.getDepthStencilState().stencilTest != mCurDepthStencilState.stencilTest)
                {
                    mDepthStencilStateIsDirty = true;
                }
                break;
            case gl::State::DIRTY_BIT_STENCIL_FUNCS_FRONT:
            {
                const gl::DepthStencilState &depthStencil = state.getDepthStencilState();
                if (depthStencil.stencilFunc != mCurDepthStencilState.stencilFunc ||
                    depthStencil.stencilMask != mCurDepthStencilState.stencilMask ||
                    state.getStencilRef() != mCurStencilRef)
//.........这里部分代码省略.........

gl::Error VertexDataManager::prepareVertexData(const gl::State &state,
                                               GLint start,
                                               GLsizei count,
                                               std::vector<TranslatedAttribute> *translatedAttribs,
                                               GLsizei instances)
{
    ASSERT(mStreamingBuffer);

    const gl::VertexArray *vertexArray = state.getVertexArray();
    const auto &vertexAttributes       = vertexArray->getVertexAttributes();

    mDynamicAttribsMaskCache.reset();
    const gl::Program *program = state.getProgram();

    translatedAttribs->clear();

    for (size_t attribIndex = 0; attribIndex < vertexAttributes.size(); ++attribIndex)
    {
        // Skip attrib locations the program doesn't use.
        if (!program->isAttribLocationActive(attribIndex))
            continue;

        const auto &attrib = vertexAttributes[attribIndex];

        // Resize automatically puts in empty attribs
        translatedAttribs->resize(attribIndex + 1);

        TranslatedAttribute *translated = &(*translatedAttribs)[attribIndex];
        auto currentValueData =
            state.getVertexAttribCurrentValue(static_cast<unsigned int>(attribIndex));

        // Record the attribute now
        translated->active           = true;
        translated->attribute        = &attrib;
        translated->currentValueType = currentValueData.Type;
        translated->divisor          = attrib.divisor;

        switch (ClassifyAttributeStorage(attrib))
        {
            case VertexStorageType::STATIC:
            {
                // Store static attribute.
                gl::Error error = StoreStaticAttrib(translated, start, count, instances);
                if (error.isError())
                {
                    return error;
                }
                break;
            }
            case VertexStorageType::DYNAMIC:
                // Dynamic attributes must be handled together.
                mDynamicAttribsMaskCache.set(attribIndex);
                break;
            case VertexStorageType::DIRECT:
                // Update translated data for direct attributes.
                StoreDirectAttrib(translated, start);
                break;
            case VertexStorageType::CURRENT_VALUE:
            {
                gl::Error error = storeCurrentValue(currentValueData, translated, attribIndex);
                if (error.isError())
                {
                    return error;
                }
                break;
            }
            default:
                UNREACHABLE();
                break;
        }
    }

    if (mDynamicAttribsMaskCache.none())
    {
        gl::Error(GL_NO_ERROR);
    }

    return storeDynamicAttribs(translatedAttribs, mDynamicAttribsMaskCache, start, count,
                               instances);
}

gl::Error VertexDataManager::prepareVertexData(const gl::State &state,
                                               GLint start,
                                               GLsizei count,
                                               std::vector<TranslatedAttribute> *translatedAttribs,
                                               GLsizei instances)
{
    if (!mStreamingBuffer)
    {
        return gl::Error(GL_OUT_OF_MEMORY, "Internal streaming vertex buffer is unexpectedly NULL.");
    }

    // Compute active enabled and active disable attributes, for speed.
    // TODO(jmadill): don't recompute if there was no state change
    const gl::VertexArray *vertexArray = state.getVertexArray();
    const gl::Program *program         = state.getProgram();
    const auto &vertexAttributes       = vertexArray->getVertexAttributes();

    mActiveEnabledAttributes.clear();
    mActiveDisabledAttributes.clear();
    translatedAttribs->clear();

    for (size_t attribIndex = 0; attribIndex < vertexAttributes.size(); ++attribIndex)
    {
        if (program->isAttribLocationActive(attribIndex))
        {
            // Resize automatically puts in empty attribs
            translatedAttribs->resize(attribIndex + 1);

            TranslatedAttribute *translated = &(*translatedAttribs)[attribIndex];

            // Record the attribute now
            translated->active = true;
            translated->attribute = &vertexAttributes[attribIndex];
            translated->currentValueType =
                state.getVertexAttribCurrentValue(static_cast<unsigned int>(attribIndex)).Type;
            translated->divisor = vertexAttributes[attribIndex].divisor;

            if (vertexAttributes[attribIndex].enabled)
            {
                mActiveEnabledAttributes.push_back(translated);
            }
            else
            {
                mActiveDisabledAttributes.push_back(attribIndex);
            }
        }
    }

    // Reserve the required space in the buffers
    for (const TranslatedAttribute *activeAttrib : mActiveEnabledAttributes)
    {
        gl::Error error = reserveSpaceForAttrib(*activeAttrib, count, instances);
        if (error.isError())
        {
            return error;
        }
    }

    // Perform the vertex data translations
    for (TranslatedAttribute *activeAttrib : mActiveEnabledAttributes)
    {
        gl::Error error = storeAttribute(activeAttrib, start, count, instances);

        if (error.isError())
        {
            hintUnmapAllResources(vertexAttributes);
            return error;
        }
    }

    for (size_t attribIndex : mActiveDisabledAttributes)
    {
        if (mCurrentValueCache[attribIndex].buffer == nullptr)
        {
            mCurrentValueCache[attribIndex].buffer = new StreamingVertexBufferInterface(mFactory, CONSTANT_VERTEX_BUFFER_SIZE);
        }

        gl::Error error = storeCurrentValue(
            state.getVertexAttribCurrentValue(static_cast<unsigned int>(attribIndex)),
            &(*translatedAttribs)[attribIndex], &mCurrentValueCache[attribIndex]);
        if (error.isError())
        {
            hintUnmapAllResources(vertexAttributes);
            return error;
        }
    }

    // Commit all the static vertex buffers. This fixes them in size/contents, and forces ANGLE
    // to use a new static buffer (or recreate the static buffers) next time
    for (size_t attribIndex = 0; attribIndex < vertexAttributes.size(); ++attribIndex)
    {
        const gl::VertexAttribute &attrib = vertexAttributes[attribIndex];
        gl::Buffer *buffer                = attrib.buffer.get();
        BufferD3D *storage = buffer ? GetImplAs<BufferD3D>(buffer) : nullptr;
        StaticVertexBufferInterface *staticBuffer =
            storage ? storage->getStaticVertexBuffer(attrib) : nullptr;

        if (staticBuffer)
        {
            staticBuffer->commit();
//.........这里部分代码省略.........

gl::Error StateManager9::setBlendDepthRasterStates(const gl::State &glState,
                                                   unsigned int sampleMask)
{
    const gl::Framebuffer *framebuffer = glState.getDrawFramebuffer();

    const gl::BlendState &blendState       = glState.getBlendState();
    const gl::ColorF &blendColor           = glState.getBlendColor();
    const gl::RasterizerState &rasterState = glState.getRasterizerState();

    const auto &depthStencilState = glState.getDepthStencilState();
    bool frontFaceCCW             = (glState.getRasterizerState().frontFace == GL_CCW);
    unsigned int maxStencil       = (1 << mCurStencilSize) - 1;

    // All the depth stencil states depends on the front face ccw variable
    if (frontFaceCCW != mCurFrontFaceCCW)
    {
        forceSetDepthStencilState();
        mCurFrontFaceCCW = frontFaceCCW;
    }

    for (auto dirtyBit : angle::IterateBitSet(mDirtyBits))
    {
        switch (dirtyBit)
        {
            case DIRTY_BIT_BLEND_ENABLED:
                setBlendEnabled(blendState.blend);
                break;
            case DIRTY_BIT_BLEND_COLOR:
                setBlendColor(blendState, blendColor);
                break;
            case DIRTY_BIT_BLEND_FUNCS_EQUATIONS:
                setBlendFuncsEquations(blendState);
                break;
            case DIRTY_BIT_SAMPLE_ALPHA_TO_COVERAGE:
                setSampleAlphaToCoverage(blendState.sampleAlphaToCoverage);
                break;
            case DIRTY_BIT_COLOR_MASK:
                setColorMask(framebuffer, blendState.colorMaskRed, blendState.colorMaskBlue,
                             blendState.colorMaskGreen, blendState.colorMaskAlpha);
                break;
            case DIRTY_BIT_DITHER:
                setDither(blendState.dither);
                break;
            case DIRTY_BIT_CULL_MODE:
                setCullMode(rasterState.cullFace, rasterState.cullMode, rasterState.frontFace);
                break;
            case DIRTY_BIT_DEPTH_BIAS:
                setDepthBias(rasterState.polygonOffsetFill, rasterState.polygonOffsetFactor,
                             rasterState.polygonOffsetUnits);
                break;
            case DIRTY_BIT_STENCIL_DEPTH_MASK:
                setDepthMask(depthStencilState.depthMask);
                break;
            case DIRTY_BIT_STENCIL_DEPTH_FUNC:
                setDepthFunc(depthStencilState.depthTest, depthStencilState.depthFunc);
                break;
            case DIRTY_BIT_STENCIL_TEST_ENABLED:
                setStencilTestEnabled(depthStencilState.stencilTest);
                break;
            case DIRTY_BIT_STENCIL_FUNCS_FRONT:
                setStencilFuncsFront(depthStencilState.stencilFunc, depthStencilState.stencilMask,
                                     glState.getStencilRef(), frontFaceCCW, maxStencil);
                break;
            case DIRTY_BIT_STENCIL_FUNCS_BACK:
                setStencilFuncsBack(depthStencilState.stencilBackFunc,
                                    depthStencilState.stencilBackMask, glState.getStencilBackRef(),
                                    frontFaceCCW, maxStencil);
                break;
            case DIRTY_BIT_STENCIL_WRITEMASK_FRONT:
                setStencilWriteMask(depthStencilState.stencilWritemask, frontFaceCCW);
                break;
            case DIRTY_BIT_STENCIL_WRITEMASK_BACK:
                setStencilBackWriteMask(depthStencilState.stencilBackWritemask, frontFaceCCW);
                break;
            case DIRTY_BIT_STENCIL_OPS_FRONT:
                setStencilOpsFront(depthStencilState.stencilFail,
                                   depthStencilState.stencilPassDepthFail,
                                   depthStencilState.stencilPassDepthPass, frontFaceCCW);
                break;
            case DIRTY_BIT_STENCIL_OPS_BACK:
                setStencilOpsBack(depthStencilState.stencilBackFail,
                                  depthStencilState.stencilBackPassDepthFail,
                                  depthStencilState.stencilBackPassDepthPass, frontFaceCCW);
                break;
            default:
                break;
        }
    }

    if (sampleMask != mCurSampleMask)
    {
        setSampleMask(sampleMask);
    }

    return gl::Error(GL_NO_ERROR);
}

gl::Error VertexArray11::updateDirtyAndDynamicAttribs(VertexDataManager *vertexDataManager,
                                                      const gl::State &state,
                                                      GLint start,
                                                      GLsizei count,
                                                      GLsizei instances)
{
    flushAttribUpdates(state);

    const gl::Program *program  = state.getProgram();
    const auto &activeLocations = program->getActiveAttribLocationsMask();
    const auto &attribs         = mData.getVertexAttributes();
    const auto &bindings        = mData.getVertexBindings();

    if (mAttribsToTranslate.any())
    {
        // Skip attrib locations the program doesn't use, saving for the next frame.
        gl::AttributesMask dirtyActiveAttribs = (mAttribsToTranslate & activeLocations);

        for (auto dirtyAttribIndex : dirtyActiveAttribs)
        {
            mAttribsToTranslate.reset(dirtyAttribIndex);

            auto *translatedAttrib = &mTranslatedAttribs[dirtyAttribIndex];
            const auto &currentValue = state.getVertexAttribCurrentValue(dirtyAttribIndex);

            // Record basic attrib info
            translatedAttrib->attribute = &attribs[dirtyAttribIndex];
            translatedAttrib->binding   = &bindings[translatedAttrib->attribute->bindingIndex];
            translatedAttrib->currentValueType = currentValue.Type;
            translatedAttrib->divisor          = translatedAttrib->binding->divisor;

            switch (mAttributeStorageTypes[dirtyAttribIndex])
            {
                case VertexStorageType::DIRECT:
                    VertexDataManager::StoreDirectAttrib(translatedAttrib);
                    break;
                case VertexStorageType::STATIC:
                {
                    ANGLE_TRY(VertexDataManager::StoreStaticAttrib(translatedAttrib));
                    break;
                }
                case VertexStorageType::CURRENT_VALUE:
                    // Current value attribs are managed by the StateManager11.
                    break;
                default:
                    UNREACHABLE();
                    break;
            }
        }
    }

    if (mDynamicAttribsMask.any())
    {
        auto activeDynamicAttribs = (mDynamicAttribsMask & activeLocations);

        for (auto dynamicAttribIndex : activeDynamicAttribs)
        {
            auto *dynamicAttrib = &mTranslatedAttribs[dynamicAttribIndex];
            const auto &currentValue = state.getVertexAttribCurrentValue(dynamicAttribIndex);

            // Record basic attrib info
            dynamicAttrib->attribute        = &attribs[dynamicAttribIndex];
            dynamicAttrib->binding          = &bindings[dynamicAttrib->attribute->bindingIndex];
            dynamicAttrib->currentValueType = currentValue.Type;
            dynamicAttrib->divisor          = dynamicAttrib->binding->divisor;
        }

        return vertexDataManager->storeDynamicAttribs(&mTranslatedAttribs, activeDynamicAttribs,
                                                      start, count, instances);
    }

    return gl::NoError();
}