FramebufferVk.cpp

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Author : Jamie Madill
Date : 2017-06-20 12:57:39
Hash : 4928b7ca
Message : Proliferate gl::Context everywhere. This gives the D3D back-end access to the GL state almost anywhere. This uses the onDestroy hook for Textures to push errors up from destructors, although they still don't quite make it to the Context. There are places, such as in EGL object (Context/Surface) destruction, where we end up calling through to GL implementation internals without having access to a gl::Context. We handle this via a proxy Context to a Display, basically a null context, that has access to impl-side state like the Renderer pointer if necessary. It does not have access to the normal GL state. Also Pass gl::Context to RefCountObject::release(). Since we're using destroy() methods now, we should not ever call the destructor directly. BUG=angleproject:1156 Change-Id: Ie4c32ad6bf6caaff0289901f30b5c6bafa2ce259 Reviewed-on: https://chromium-review.googlesource.com/529707 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>
src/libANGLE/renderer/vulkan/FramebufferVk.cpp
//
// Copyright 2016 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// FramebufferVk.cpp:
//    Implements the class methods for FramebufferVk.
//

#include "libANGLE/renderer/vulkan/FramebufferVk.h"

#include <vulkan/vulkan.h>
#include <array>

#include "common/debug.h"
#include "image_util/imageformats.h"
#include "libANGLE/Context.h"
#include "libANGLE/Display.h"
#include "libANGLE/formatutils.h"
#include "libANGLE/renderer/renderer_utils.h"
#include "libANGLE/renderer/vulkan/ContextVk.h"
#include "libANGLE/renderer/vulkan/DisplayVk.h"
#include "libANGLE/renderer/vulkan/RenderTargetVk.h"
#include "libANGLE/renderer/vulkan/RendererVk.h"
#include "libANGLE/renderer/vulkan/SurfaceVk.h"
#include "libANGLE/renderer/vulkan/formatutilsvk.h"

namespace rx
{

namespace
{

gl::ErrorOrResult<const gl::InternalFormat *> GetReadAttachmentInfo(
    const gl::Context *context,
    const gl::FramebufferAttachment *readAttachment)
{
    RenderTargetVk *renderTarget = nullptr;
    ANGLE_TRY(readAttachment->getRenderTarget(context, &renderTarget));

    GLenum implFormat = renderTarget->format->format().fboImplementationInternalFormat;
    return &gl::GetSizedInternalFormatInfo(implFormat);
}

VkSampleCountFlagBits ConvertSamples(GLint sampleCount)
{
    switch (sampleCount)
    {
        case 0:
        case 1:
            return VK_SAMPLE_COUNT_1_BIT;
        case 2:
            return VK_SAMPLE_COUNT_2_BIT;
        case 4:
            return VK_SAMPLE_COUNT_4_BIT;
        case 8:
            return VK_SAMPLE_COUNT_8_BIT;
        case 16:
            return VK_SAMPLE_COUNT_16_BIT;
        case 32:
            return VK_SAMPLE_COUNT_32_BIT;
        default:
            UNREACHABLE();
            return VK_SAMPLE_COUNT_FLAG_BITS_MAX_ENUM;
    }
}

}  // anonymous namespace

// static
FramebufferVk *FramebufferVk::CreateUserFBO(const gl::FramebufferState &state)
{
    return new FramebufferVk(state);
}

// static
FramebufferVk *FramebufferVk::CreateDefaultFBO(const gl::FramebufferState &state,
                                               WindowSurfaceVk *backbuffer)
{
    return new FramebufferVk(state, backbuffer);
}

FramebufferVk::FramebufferVk(const gl::FramebufferState &state)
    : FramebufferImpl(state), mBackbuffer(nullptr), mRenderPass(), mFramebuffer()
{
}

FramebufferVk::FramebufferVk(const gl::FramebufferState &state, WindowSurfaceVk *backbuffer)
    : FramebufferImpl(state), mBackbuffer(backbuffer), mRenderPass(), mFramebuffer()
{
}

FramebufferVk::~FramebufferVk()
{
}

void FramebufferVk::destroy(const gl::Context *context)
{
    VkDevice device = GetImplAs<ContextVk>(context)->getDevice();

    mRenderPass.destroy(device);
    mFramebuffer.destroy(device);
}

void FramebufferVk::destroyDefault(const egl::Display *display)
{
    VkDevice device = GetImplAs<DisplayVk>(display)->getRenderer()->getDevice();

    mRenderPass.destroy(device);
    mFramebuffer.destroy(device);
}

gl::Error FramebufferVk::discard(const gl::Context *context,
                                 size_t count,
                                 const GLenum *attachments)
{
    UNIMPLEMENTED();
    return gl::InternalError();
}

gl::Error FramebufferVk::invalidate(const gl::Context *context,
                                    size_t count,
                                    const GLenum *attachments)
{
    UNIMPLEMENTED();
    return gl::InternalError();
}

gl::Error FramebufferVk::invalidateSub(const gl::Context *context,
                                       size_t count,
                                       const GLenum *attachments,
                                       const gl::Rectangle &area)
{
    UNIMPLEMENTED();
    return gl::InternalError();
}

gl::Error FramebufferVk::clear(const gl::Context *context, GLbitfield mask)
{
    ContextVk *contextVk = GetImplAs<ContextVk>(context);

    if (mState.getDepthAttachment() && (mask & GL_DEPTH_BUFFER_BIT) != 0)
    {
        // TODO(jmadill): Depth clear
        UNIMPLEMENTED();
    }

    if (mState.getStencilAttachment() && (mask & GL_STENCIL_BUFFER_BIT) != 0)
    {
        // TODO(jmadill): Stencil clear
        UNIMPLEMENTED();
    }

    if ((mask & GL_COLOR_BUFFER_BIT) == 0)
    {
        return gl::NoError();
    }

    const auto &glState    = context->getGLState();
    const auto &clearColor = glState.getColorClearValue();
    VkClearColorValue clearColorValue;
    clearColorValue.float32[0] = clearColor.red;
    clearColorValue.float32[1] = clearColor.green;
    clearColorValue.float32[2] = clearColor.blue;
    clearColorValue.float32[3] = clearColor.alpha;

    // TODO(jmadill): Scissored clears.
    const auto *attachment = mState.getFirstNonNullAttachment();
    ASSERT(attachment && attachment->isAttached());
    const auto &size = attachment->getSize();
    const gl::Rectangle renderArea(0, 0, size.width, size.height);

    vk::CommandBuffer *commandBuffer = nullptr;
    ANGLE_TRY(contextVk->getStartedCommandBuffer(&commandBuffer));

    for (const auto &colorAttachment : mState.getColorAttachments())
    {
        if (colorAttachment.isAttached())
        {
            RenderTargetVk *renderTarget = nullptr;
            ANGLE_TRY(colorAttachment.getRenderTarget(context, &renderTarget));
            renderTarget->image->changeLayoutTop(
                VK_IMAGE_ASPECT_COLOR_BIT, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, commandBuffer);
            commandBuffer->clearSingleColorImage(*renderTarget->image, clearColorValue);
        }
    }

    return gl::NoError();
}

gl::Error FramebufferVk::clearBufferfv(const gl::Context *context,
                                       GLenum buffer,
                                       GLint drawbuffer,
                                       const GLfloat *values)
{
    UNIMPLEMENTED();
    return gl::InternalError();
}

gl::Error FramebufferVk::clearBufferuiv(const gl::Context *context,
                                        GLenum buffer,
                                        GLint drawbuffer,
                                        const GLuint *values)
{
    UNIMPLEMENTED();
    return gl::InternalError();
}

gl::Error FramebufferVk::clearBufferiv(const gl::Context *context,
                                       GLenum buffer,
                                       GLint drawbuffer,
                                       const GLint *values)
{
    UNIMPLEMENTED();
    return gl::InternalError();
}

gl::Error FramebufferVk::clearBufferfi(const gl::Context *context,
                                       GLenum buffer,
                                       GLint drawbuffer,
                                       GLfloat depth,
                                       GLint stencil)
{
    UNIMPLEMENTED();
    return gl::InternalError();
}

GLenum FramebufferVk::getImplementationColorReadFormat(const gl::Context *context) const
{
    auto errOrResult = GetReadAttachmentInfo(context, mState.getReadAttachment());

    // TODO(jmadill): Handle getRenderTarget error.
    if (errOrResult.isError())
    {
        ERR() << "Internal error in FramebufferVk::getImplementationColorReadFormat.";
        return GL_NONE;
    }

    return errOrResult.getResult()->format;
}

GLenum FramebufferVk::getImplementationColorReadType(const gl::Context *context) const
{
    auto errOrResult = GetReadAttachmentInfo(context, mState.getReadAttachment());

    // TODO(jmadill): Handle getRenderTarget error.
    if (errOrResult.isError())
    {
        ERR() << "Internal error in FramebufferVk::getImplementationColorReadFormat.";
        return GL_NONE;
    }

    return errOrResult.getResult()->type;
}

gl::Error FramebufferVk::readPixels(const gl::Context *context,
                                    const gl::Rectangle &area,
                                    GLenum format,
                                    GLenum type,
                                    void *pixels) const
{
    const auto &glState         = context->getGLState();
    const auto *readFramebuffer = glState.getReadFramebuffer();
    const auto *readAttachment  = readFramebuffer->getReadColorbuffer();

    RenderTargetVk *renderTarget = nullptr;
    ANGLE_TRY(readAttachment->getRenderTarget(context, &renderTarget));

    ContextVk *contextVk = GetImplAs<ContextVk>(context);
    RendererVk *renderer = contextVk->getRenderer();
    VkDevice device      = renderer->getDevice();

    vk::Image *readImage = renderTarget->image;
    vk::StagingImage stagingImage;
    ANGLE_TRY(renderer->createStagingImage(TextureDimension::TEX_2D, *renderTarget->format,
                                           renderTarget->extents, &stagingImage));

    vk::CommandBuffer *commandBuffer = nullptr;
    ANGLE_TRY(contextVk->getStartedCommandBuffer(&commandBuffer));

    stagingImage.getImage().changeLayoutTop(VK_IMAGE_ASPECT_COLOR_BIT, VK_IMAGE_LAYOUT_GENERAL,
                                            commandBuffer);

    gl::Box copyRegion;
    copyRegion.x      = area.x;
    copyRegion.y      = area.y;
    copyRegion.z      = 0;
    copyRegion.width  = area.width;
    copyRegion.height = area.height;
    copyRegion.depth  = 1;

    readImage->changeLayoutTop(VK_IMAGE_ASPECT_COLOR_BIT, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
                               commandBuffer);
    commandBuffer->copySingleImage(*readImage, stagingImage.getImage(), copyRegion,
                                   VK_IMAGE_ASPECT_COLOR_BIT);

    ANGLE_TRY(renderer->submitAndFinishCommandBuffer(commandBuffer));

    // TODO(jmadill): parameters
    uint8_t *mapPointer = nullptr;
    ANGLE_TRY(
        stagingImage.getDeviceMemory().map(device, 0, stagingImage.getSize(), 0, &mapPointer));

    const auto &angleFormat = renderTarget->format->format();

    // TODO(jmadill): Use pixel bytes from the ANGLE format directly.
    const auto &glFormat = gl::GetSizedInternalFormatInfo(angleFormat.glInternalFormat);
    int inputPitch       = glFormat.pixelBytes * area.width;

    PackPixelsParams params;
    params.area        = area;
    params.format      = format;
    params.type        = type;
    params.outputPitch = inputPitch;
    params.pack.copyFrom(context, glState.getPackState());

    PackPixels(params, angleFormat, inputPitch, mapPointer, reinterpret_cast<uint8_t *>(pixels));

    stagingImage.getDeviceMemory().unmap(device);
    renderer->enqueueGarbage(renderer->getCurrentQueueSerial(), std::move(stagingImage));

    stagingImage.getImage().destroy(renderer->getDevice());

    stagingImage.destroy(device);

    return vk::NoError();
}

gl::Error FramebufferVk::blit(const gl::Context *context,
                              const gl::Rectangle &sourceArea,
                              const gl::Rectangle &destArea,
                              GLbitfield mask,
                              GLenum filter)
{
    UNIMPLEMENTED();
    return gl::InternalError();
}

bool FramebufferVk::checkStatus() const
{
    UNIMPLEMENTED();
    return bool();
}

void FramebufferVk::syncState(const gl::Context *context,
                              const gl::Framebuffer::DirtyBits &dirtyBits)
{
    auto contextVk = GetImplAs<ContextVk>(context);

    ASSERT(dirtyBits.any());

    // TODO(jmadill): Smarter update.
    mRenderPass.destroy(contextVk->getDevice());
    mFramebuffer.destroy(contextVk->getDevice());

    // TODO(jmadill): Use pipeline cache.
    contextVk->invalidateCurrentPipeline();
}

gl::ErrorOrResult<vk::RenderPass *> FramebufferVk::getRenderPass(const gl::Context *context,
                                                                 VkDevice device)
{
    if (mRenderPass.valid())
    {
        return &mRenderPass;
    }

    // TODO(jmadill): Can we use stack-only memory?
    std::vector<VkAttachmentDescription> attachmentDescs;
    std::vector<VkAttachmentReference> colorAttachmentRefs;

    const auto &colorAttachments = mState.getColorAttachments();
    for (size_t attachmentIndex = 0; attachmentIndex < colorAttachments.size(); ++attachmentIndex)
    {
        const auto &colorAttachment = colorAttachments[attachmentIndex];
        if (colorAttachment.isAttached())
        {
            VkAttachmentDescription colorDesc;
            VkAttachmentReference colorRef;

            RenderTargetVk *renderTarget = nullptr;
            ANGLE_TRY(colorAttachment.getRenderTarget(context, &renderTarget));

            // TODO(jmadill): We would only need this flag for duplicated attachments.
            colorDesc.flags   = VK_ATTACHMENT_DESCRIPTION_MAY_ALIAS_BIT;
            colorDesc.format  = renderTarget->format->native;
            colorDesc.samples = ConvertSamples(colorAttachment.getSamples());

            // The load op controls the prior existing depth/color attachment data.
            // TODO(jmadill): Proper load ops. Should not be hard coded to clear.
            colorDesc.loadOp         = VK_ATTACHMENT_LOAD_OP_CLEAR;
            colorDesc.storeOp        = VK_ATTACHMENT_STORE_OP_STORE;
            colorDesc.stencilLoadOp  = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
            colorDesc.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
            colorDesc.initialLayout  = VK_IMAGE_LAYOUT_UNDEFINED;

            // We might want to transition directly to PRESENT_SRC for Surface attachments.
            colorDesc.finalLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;

            colorRef.attachment = static_cast<uint32_t>(colorAttachments.size()) - 1u;
            colorRef.layout     = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;

            attachmentDescs.push_back(colorDesc);
            colorAttachmentRefs.push_back(colorRef);
        }
    }

    const auto *depthStencilAttachment = mState.getDepthStencilAttachment();
    VkAttachmentReference depthStencilAttachmentRef;
    bool useDepth = depthStencilAttachment && depthStencilAttachment->isAttached();

    if (useDepth)
    {
        VkAttachmentDescription depthStencilDesc;

        RenderTargetVk *renderTarget = nullptr;
        ANGLE_TRY(depthStencilAttachment->getRenderTarget(context, &renderTarget));

        depthStencilDesc.flags          = 0;
        depthStencilDesc.format         = renderTarget->format->native;
        depthStencilDesc.samples        = ConvertSamples(depthStencilAttachment->getSamples());
        depthStencilDesc.loadOp         = VK_ATTACHMENT_LOAD_OP_CLEAR;
        depthStencilDesc.storeOp        = VK_ATTACHMENT_STORE_OP_STORE;
        depthStencilDesc.stencilLoadOp  = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
        depthStencilDesc.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
        depthStencilDesc.initialLayout  = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;
        depthStencilDesc.finalLayout    = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;

        depthStencilAttachmentRef.attachment = static_cast<uint32_t>(attachmentDescs.size());
        depthStencilAttachmentRef.layout     = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;

        attachmentDescs.push_back(depthStencilDesc);
    }

    ASSERT(!attachmentDescs.empty());

    VkSubpassDescription subpassDesc;

    subpassDesc.flags                   = 0;
    subpassDesc.pipelineBindPoint       = VK_PIPELINE_BIND_POINT_GRAPHICS;
    subpassDesc.inputAttachmentCount    = 0;
    subpassDesc.pInputAttachments       = nullptr;
    subpassDesc.colorAttachmentCount    = static_cast<uint32_t>(colorAttachmentRefs.size());
    subpassDesc.pColorAttachments       = colorAttachmentRefs.data();
    subpassDesc.pResolveAttachments     = nullptr;
    subpassDesc.pDepthStencilAttachment = (useDepth ? &depthStencilAttachmentRef : nullptr);
    subpassDesc.preserveAttachmentCount = 0;
    subpassDesc.pPreserveAttachments    = nullptr;

    VkRenderPassCreateInfo renderPassInfo;

    renderPassInfo.sType           = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;
    renderPassInfo.pNext           = nullptr;
    renderPassInfo.flags           = 0;
    renderPassInfo.attachmentCount = static_cast<uint32_t>(attachmentDescs.size());
    renderPassInfo.pAttachments    = attachmentDescs.data();
    renderPassInfo.subpassCount    = 1;
    renderPassInfo.pSubpasses      = &subpassDesc;
    renderPassInfo.dependencyCount = 0;
    renderPassInfo.pDependencies   = nullptr;

    vk::RenderPass renderPass;
    ANGLE_TRY(renderPass.init(device, renderPassInfo));

    mRenderPass.retain(device, std::move(renderPass));

    return &mRenderPass;
}

gl::ErrorOrResult<vk::Framebuffer *> FramebufferVk::getFramebuffer(const gl::Context *context,
                                                                   VkDevice device)
{
    // If we've already created our cached Framebuffer, return it.
    if (mFramebuffer.valid())
    {
        return &mFramebuffer;
    }

    vk::RenderPass *renderPass = nullptr;
    ANGLE_TRY_RESULT(getRenderPass(context, device), renderPass);

    // If we've a Framebuffer provided by a Surface (default FBO/backbuffer), query it.
    if (mBackbuffer)
    {
        return mBackbuffer->getCurrentFramebuffer(device, *renderPass);
    }

    // Gather VkImageViews over all FBO attachments, also size of attached region.
    std::vector<VkImageView> attachments;
    gl::Extents attachmentsSize;

    const auto &colorAttachments = mState.getColorAttachments();
    for (size_t attachmentIndex = 0; attachmentIndex < colorAttachments.size(); ++attachmentIndex)
    {
        const auto &colorAttachment = colorAttachments[attachmentIndex];
        if (colorAttachment.isAttached())
        {
            RenderTargetVk *renderTarget = nullptr;
            ANGLE_TRY(colorAttachment.getRenderTarget<RenderTargetVk>(context, &renderTarget));
            attachments.push_back(renderTarget->imageView->getHandle());

            ASSERT(attachmentsSize.empty() || attachmentsSize == colorAttachment.getSize());
            attachmentsSize = colorAttachment.getSize();
        }
    }

    const auto *depthStencilAttachment = mState.getDepthStencilAttachment();
    if (depthStencilAttachment && depthStencilAttachment->isAttached())
    {
        RenderTargetVk *renderTarget = nullptr;
        ANGLE_TRY(depthStencilAttachment->getRenderTarget<RenderTargetVk>(context, &renderTarget));
        attachments.push_back(renderTarget->imageView->getHandle());

        ASSERT(attachmentsSize.empty() || attachmentsSize == depthStencilAttachment->getSize());
        attachmentsSize = depthStencilAttachment->getSize();
    }

    ASSERT(!attachments.empty());

    VkFramebufferCreateInfo framebufferInfo;

    framebufferInfo.sType           = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
    framebufferInfo.pNext           = nullptr;
    framebufferInfo.flags           = 0;
    framebufferInfo.renderPass      = mRenderPass.getHandle();
    framebufferInfo.attachmentCount = static_cast<uint32_t>(attachments.size());
    framebufferInfo.pAttachments    = attachments.data();
    framebufferInfo.width           = static_cast<uint32_t>(attachmentsSize.width);
    framebufferInfo.height          = static_cast<uint32_t>(attachmentsSize.height);
    framebufferInfo.layers          = 1;

    vk::Framebuffer framebuffer;
    ANGLE_TRY(static_cast<gl::Error>(framebuffer.init(device, framebufferInfo)));

    mFramebuffer.retain(device, std::move(framebuffer));

    return &mFramebuffer;
}

gl::Error FramebufferVk::getSamplePosition(size_t index, GLfloat *xy) const
{
    UNIMPLEMENTED();
    return gl::InternalError() << "getSamplePosition is unimplemented.";
}

gl::Error FramebufferVk::beginRenderPass(const gl::Context *context,
                                         VkDevice device,
                                         vk::CommandBuffer *commandBuffer,
                                         Serial queueSerial,
                                         const gl::State &glState)
{
    // TODO(jmadill): Cache render targets.
    for (const auto &colorAttachment : mState.getColorAttachments())
    {
        if (colorAttachment.isAttached())
        {
            RenderTargetVk *renderTarget = nullptr;
            ANGLE_TRY(colorAttachment.getRenderTarget<RenderTargetVk>(context, &renderTarget));
            renderTarget->resource->setQueueSerial(queueSerial);
        }
    }

    const auto *depthStencilAttachment = mState.getDepthStencilAttachment();
    if (depthStencilAttachment && depthStencilAttachment->isAttached())
    {
        RenderTargetVk *renderTarget = nullptr;
        ANGLE_TRY(depthStencilAttachment->getRenderTarget<RenderTargetVk>(context, &renderTarget));
        renderTarget->resource->setQueueSerial(queueSerial);
    }

    vk::Framebuffer *framebuffer = nullptr;
    ANGLE_TRY_RESULT(getFramebuffer(context, device), framebuffer);
    ASSERT(framebuffer && framebuffer->valid());

    vk::RenderPass *renderPass = nullptr;
    ANGLE_TRY_RESULT(getRenderPass(context, device), renderPass);
    ASSERT(renderPass && renderPass->valid());

    // TODO(jmadill): Proper clear value implementation.
    VkClearColorValue colorClear;
    memset(&colorClear, 0, sizeof(VkClearColorValue));
    colorClear.float32[0] = glState.getColorClearValue().red;
    colorClear.float32[1] = glState.getColorClearValue().green;
    colorClear.float32[2] = glState.getColorClearValue().blue;
    colorClear.float32[3] = glState.getColorClearValue().alpha;

    std::vector<VkClearValue> attachmentClearValues;
    attachmentClearValues.push_back({colorClear});

    // Updated the cached image layout of the attachments in this FBO.
    // For a default FBO, we need to call through to the WindowSurfaceVk
    // TODO(jmadill): Iterate over all attachments.
    ASSERT(mBackbuffer);
    RenderTargetVk *renderTarget = nullptr;
    ANGLE_TRY(mState.getFirstColorAttachment()->getRenderTarget(context, &renderTarget));
    renderTarget->image->updateLayout(VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL);

    commandBuffer->beginRenderPass(*renderPass, *framebuffer, glState.getViewport(),
                                   attachmentClearValues);

    setQueueSerial(queueSerial);
    if (mBackbuffer)
    {
        mBackbuffer->setQueueSerial(queueSerial);
    }

    return gl::NoError();
}

}  // namespace rx
kc3-lang/angle/src/libANGLE/renderer/vulkan/FramebufferVk.cpp

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kc3-lang/angle /src/libANGLE/renderer/vulkan/FramebufferVk.cpp
