Method CopyScreenToBuffer

source/common/rendering/vulkan/system/vk_renderdevice.cpp:385–435

}

void VulkanRenderDevice::CopyScreenToBuffer(int w, int h, uint8_t *data)
{
	VkTextureImage image;

	// Convert from rgba16f to rgba8 using the GPU:
	image.Image = ImageBuilder()
		.Format(VK_FORMAT_R8G8B8A8_UNORM)
		.Usage(VK_IMAGE_USAGE_TRANSFER_SRC_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT)
		.Size(w, h)
		.DebugName("CopyScreenToBuffer")
		.Create(device.get());

	GetPostprocess()->BlitCurrentToImage(&image, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL);

	// Staging buffer for download
	auto staging = BufferBuilder()
		.Size(w * h * 4)
		.Usage(VK_BUFFER_USAGE_TRANSFER_DST_BIT, VMA_MEMORY_USAGE_GPU_TO_CPU)
		.DebugName("CopyScreenToBuffer")
		.Create(device.get());

	// Copy from image to buffer
	VkBufferImageCopy region = {};
	region.imageExtent.width = w;
	region.imageExtent.height = h;
	region.imageExtent.depth = 1;
	region.imageSubresource.layerCount = 1;
	region.imageSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
	mCommands->GetDrawCommands()->copyImageToBuffer(image.Image->image, image.Layout, staging->buffer, 1, &region);

	// Submit command buffers and wait for device to finish the work
	mCommands->WaitForCommands(false);

	// Map and convert from rgba8 to rgb8
	uint8_t *dest = (uint8_t*)data;
	uint8_t *pixels = (uint8_t*)staging->Map(0, w * h * 4);
	int dindex = 0;
	for (int y = 0; y < h; y++)
	{
		int sindex = (h - y - 1) * w * 4;
		for (int x = 0; x < w; x++)
		{
			dest[dindex] = pixels[sindex];
			dest[dindex + 1] = pixels[sindex + 1];
			dest[dindex + 2] = pixels[sindex + 2];
			dindex += 3;
			sindex += 4;
		}
	}
	staging->Unmap();
}

void VulkanRenderDevice::SetActiveRenderTarget()
{