我可以從R32G32B32A32圖像中轉儲內容以獲取屏幕截圖。我想從R32G32_SFLOAT圖像中讀出一個像素。但結果看起來很奇怪。下面如何在Vulkan中讀取gpu中的R32G32_SFLOAT圖像
是我的工作形象轉儲代碼(沒有驗證錯誤)
void DumpImageToFile(VkTool::VulkanDevice &device, VkQueue graphics_queue, VkTool::Wrapper::CommandBuffers &command_buffer, VkImage image, uint32_t width, uint32_t height, const char *filename)
{
auto image_create_info = VkTool::Initializer::GenerateImageCreateInfo(VK_IMAGE_TYPE_2D, VK_FORMAT_R8G8B8A8_UNORM, {width, height, 1},
VK_IMAGE_USAGE_TRANSFER_SRC_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT, VK_SAMPLE_COUNT_1_BIT);
VkTool::Wrapper::Image staging_image(device, image_create_info, VK_MEMORY_HEAP_DEVICE_LOCAL_BIT);
auto buffer_create_info = VkTool::Initializer::GenerateBufferCreateInfo(width * height * 4, VK_BUFFER_USAGE_TRANSFER_DST_BIT);
VkTool::Wrapper::Buffer staging_buffer(device, buffer_create_info, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
// Copy texture to buffer
command_buffer.Begin();
auto image_memory_barrier = VkTool::Initializer::GenerateImageMemoryBarrier(VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
{ VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 }, staging_image.Get());
device.vkCmdPipelineBarrier(command_buffer.Get(), VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, 0
, 0, nullptr, 0, nullptr, 1, &image_memory_barrier);
image_memory_barrier = VkTool::Initializer::GenerateImageMemoryBarrier(VK_IMAGE_LAYOUT_UNDEFINED, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
{ VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 }, image);
device.vkCmdPipelineBarrier(command_buffer.Get(), VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, 0
, 0, nullptr, 0, nullptr, 1, &image_memory_barrier);
// Copy!!
VkImageBlit region = {};
region.srcSubresource = { VK_IMAGE_ASPECT_COLOR_BIT, 0, 0, 1 };
region.srcOffsets[0] = { 0, 0, 0 };
region.srcOffsets[1] = { static_cast<int32_t>(width), static_cast<int32_t>(height), 1};
region.dstSubresource = { VK_IMAGE_ASPECT_COLOR_BIT, 0, 0, 1 };
region.dstOffsets[0] = { 0, 0, 0 };
region.dstOffsets[1] = { static_cast<int32_t>(width), static_cast<int32_t>(height), 1 };
device.vkCmdBlitImage(command_buffer.Get(), image, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL, staging_image.Get(), VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, 1, ®ion, VK_FILTER_LINEAR);
image_memory_barrier = VkTool::Initializer::GenerateImageMemoryBarrier(VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL, VK_IMAGE_LAYOUT_PRESENT_SRC_KHR,
{ VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 }, image);
device.vkCmdPipelineBarrier(command_buffer.Get(), VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT, 0
, 0, nullptr, 0, nullptr, 1, &image_memory_barrier);
image_memory_barrier = VkTool::Initializer::GenerateImageMemoryBarrier(VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
{ VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 }, staging_image.Get());
device.vkCmdPipelineBarrier(command_buffer.Get(), VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, 0
, 0, nullptr, 0, nullptr, 1, &image_memory_barrier);
auto buffer_image_copy = VkTool::Initializer::GenerateBufferImageCopy({ VK_IMAGE_ASPECT_COLOR_BIT , 0, 0, 1 }, { width, height, 1 });
device.vkCmdCopyImageToBuffer(command_buffer.Get(), staging_image.Get(), VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL, staging_buffer.Get(), 1, &buffer_image_copy);
command_buffer.End();
std::vector<VkCommandBuffer> raw_command_buffers = command_buffer.GetAll();
auto submit_info = VkTool::Initializer::GenerateSubmitInfo(raw_command_buffers);
VkTool::Wrapper::Fence fence(device);
device.vkQueueSubmit(graphics_queue, 1, &submit_info, fence.Get());
fence.Wait();
fence.Destroy();
const uint8_t *mapped_address = reinterpret_cast<const uint8_t *>(staging_buffer.MapMemory());
lodepng::encode(filename, mapped_address, width, height);
staging_buffer.UnmapMemory();
staging_image.Destroy();
staging_buffer.Destroy();
}
對不起,醜陋的自制包裝,並沒有正式的包裝。基本上,它創建了一個臨時映像和緩衝區。首先從源圖像複製到vkCmdBlitImage的分段映像。然後使用vkCmdCopyImageToBuffer並將緩衝區映射到主機內存。這個方法適用於多個gpus,它不需要擔心填充(我猜,如果我錯了,糾正我)。
但是,我沒有運氣使用這種方法來讀取R32G32_SFLOAT。起初我認爲這是因爲排序,直到我把整個圖像轉儲出來。
上面的圖片是我直接轉換R32G32_SFLOAT到R8G8B8A8_UNORM,我知道這是沒有意義的。但如果不改變格式,圖像中仍然存在很多「漏洞」,而且這些值是致命的錯誤。
請問您對上次陳述發表評論嗎?我無法看到基於某些可用功能集編寫的編寫良好且正確同步的代碼如何在支持功能列表的一個GPU驅動程序對上工作,而無法在支持相同功能的另一個GPU驅動程序對上工作。 –
有一個誤解。我的意思是某些GPU需要比其他GPU更多的同步或適當的佈局轉換。例如,對於NVIDIA,您可能不需要完全同步所有內容以使其正常工作。 AMD顯卡需要更多的努力。但是,我沒有說代碼是正確的。正如我剛纔所說的,一個錯誤的代碼可以在NVIDIA上運行,但在AMD上不會運行,OP的情況就是這樣。它的代碼適用於某些GPU,但不適用於所有人;) –
我使用分段映像的原因是我希望看到在不同格式的src和dst映像上使用vkCmdBlitImage時會發生什麼情況。 Yap它是彩色附件。寫入「未定義」真的意味着我現在不關心格式和同步。我希望這個功能可以用於非彩色附件圖像。 –