Method CopyTexture

Source/Engine/GraphicsDevice/Vulkan/GPUContextVulkan.cpp:1557–1640

}

void GPUContextVulkan::CopyTexture(GPUTexture* dstResource, uint32 dstSubresource, uint32 dstX, uint32 dstY, uint32 dstZ, GPUTexture* srcResource, uint32 srcSubresource)
{
    ASSERT(dstResource && srcResource);
    const auto cmdBuffer = _cmdBufferManager->GetCmdBuffer();

    // Ensure to end active render pass
    if (cmdBuffer->IsInsideRenderPass())
        EndRenderPass();

    const auto dstTextureVulkan = static_cast<GPUTextureVulkan*>(dstResource);
    const auto srcTextureVulkan = static_cast<GPUTextureVulkan*>(srcResource);

    const int32 dstMipIndex = (int32)dstSubresource % dstTextureVulkan->MipLevels();
    const int32 dstArrayIndex = (int32)dstSubresource / dstTextureVulkan->MipLevels();
    const int32 srcMipIndex = (int32)srcSubresource % srcTextureVulkan->MipLevels();
    const int32 srcArrayIndex = (int32)srcSubresource / srcTextureVulkan->MipLevels();
    int32 mipWidth, mipHeight, mipDepth;
    srcTextureVulkan->GetMipSize(srcMipIndex, mipWidth, mipHeight, mipDepth);

    if (dstTextureVulkan->IsStaging())
    {
        // Staging Texture -> Staging Texture
        if (srcTextureVulkan->IsStaging())
        {
            ASSERT(dstTextureVulkan->StagingBuffer && srcTextureVulkan->StagingBuffer);
            CopyResource(dstTextureVulkan->StagingBuffer, srcTextureVulkan->StagingBuffer);
        }
        // Texture -> Staging Texture
        else
        {
            // Transition resources
            ASSERT(dstTextureVulkan->StagingBuffer);
            AddBufferBarrier(dstTextureVulkan->StagingBuffer, VK_ACCESS_TRANSFER_WRITE_BIT);
            AddImageBarrier(srcTextureVulkan, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL);
            FlushBarriers();

            // Copy
            VkBufferImageCopy region;
            Platform::MemoryClear(&region, sizeof(VkBufferImageCopy));
            region.bufferOffset = 0; // TODO: calculate it based on dstSubresource and dstX/dstY/dstZ
            ASSERT(dstX == dstY == dstZ == 0);
            ASSERT(dstSubresource == 0);
            region.bufferRowLength = mipWidth;
            region.bufferImageHeight = mipHeight;
            region.imageOffset.x = 0;
            region.imageOffset.y = 0;
            region.imageOffset.z = 0;
            region.imageExtent.width = mipWidth;
            region.imageExtent.height = mipHeight;
            region.imageExtent.depth = mipDepth;
            region.imageSubresource.baseArrayLayer = srcArrayIndex;
            region.imageSubresource.layerCount = 1;
            region.imageSubresource.mipLevel = srcMipIndex;
            region.imageSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
            vkCmdCopyImageToBuffer(cmdBuffer->GetHandle(), srcTextureVulkan->GetHandle(), VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL, dstTextureVulkan->StagingBuffer->GetHandle(), 1, &region);
        }
    }
    else