There are two ways that can copy data to image(using stage buffer or not).In the first way that using stage buffer, when the image format is VK_FORMAT_R8G8B8A8_UNORM or VK_FORMAT_R8G8B8_UNORM, it works correctly.But in the way that not using stage buffer, the image format is VK_FORMAT_R8G8B8A8_UNORM, it works well. While changing the format to VK_FORMAT_R8G8B8_UNORM, the result of sample is not correct.The source data can be assured correct when setting different image format .
The code used is from [https://github.com/SaschaWillems/Vulkan/blob/master/examples/texture/texture.cpp](https://www.stackoverflow.com/
if (0/*useStaging*/) {
// Copy data to an optimal tiled image
// This loads the texture data into a host local buffer that is copied to the optimal tiled image on the device
// Create a host-visible staging buffer that contains the raw image data
// This buffer will be the data source for copying texture data to the optimal tiled image on the device
VkBuffer stagingBuffer;
VkDeviceMemory stagingMemory;
VkBufferCreateInfo bufferCreateInfo = vks::initializers::bufferCreateInfo();
bufferCreateInfo.size = ktxTextureSize;
// This buffer is used as a transfer source for the buffer copy
bufferCreateInfo.usage = VK_BUFFER_USAGE_TRANSFER_SRC_BIT;
bufferCreateInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
VK_CHECK_RESULT(vkCreateBuffer(device, &bufferCreateInfo, nullptr, &stagingBuffer));
// Get memory requirements for the staging buffer (alignment, memory type bits)
vkGetBufferMemoryRequirements(device, stagingBuffer, &memReqs);
memAllocInfo.allocationSize = memReqs.size;
// Get memory type index for a host visible buffer
memAllocInfo.memoryTypeIndex = vulkanDevice->getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
VK_CHECK_RESULT(vkAllocateMemory(device, &memAllocInfo, nullptr, &stagingMemory));
VK_CHECK_RESULT(vkBindBufferMemory(device, stagingBuffer, stagingMemory, 0));
// Copy texture data into host local staging buffer
uint8_t *data;
VK_CHECK_RESULT(vkMapMemory(device, stagingMemory, 0, memReqs.size, 0, (void **)&data));
memcpy(data, ktxTextureData, ktxTextureSize);
vkUnmapMemory(device, stagingMemory);
// Setup buffer copy regions for each mip level
std::vector<VkBufferImageCopy> bufferCopyRegions;
uint32_t offset = 0;
for (uint32_t i = 0; i < texture.mipLevels; i++) {
// Calculate offset into staging buffer for the current mip level
ktx_size_t offset;
KTX_error_code ret = ktxTexture_GetImageOffset(ktxTexture, i, 0, 0, &offset);
assert(ret == KTX_SUCCESS);
// Setup a buffer image copy structure for the current mip level
VkBufferImageCopy bufferCopyRegion = {};
bufferCopyRegion.imageSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
bufferCopyRegion.imageSubresource.mipLevel = i;
bufferCopyRegion.imageSubresource.baseArrayLayer = 0;
bufferCopyRegion.imageSubresource.layerCount = 1;
bufferCopyRegion.imageExtent.width = ktxTexture->baseWidth >> i;
bufferCopyRegion.imageExtent.height = ktxTexture->baseHeight >> i;
bufferCopyRegion.imageExtent.depth = 1;
bufferCopyRegion.bufferOffset = offset;
bufferCopyRegions.push_back(bufferCopyRegion);
}
// Create optimal tiled target image on the device
VkImageCreateInfo imageCreateInfo = vks::initializers::imageCreateInfo();
imageCreateInfo.imageType = VK_IMAGE_TYPE_2D;
imageCreateInfo.format = format;
imageCreateInfo.mipLevels = texture.mipLevels;
imageCreateInfo.arrayLayers = 1;
imageCreateInfo.samples = VK_SAMPLE_COUNT_1_BIT;
imageCreateInfo.tiling = VK_IMAGE_TILING_OPTIMAL;
imageCreateInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
// Set initial layout of the image to undefined
imageCreateInfo.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
imageCreateInfo.extent = { texture.width, texture.height, 1 };
imageCreateInfo.usage = VK_IMAGE_USAGE_TRANSFER_DST_BIT | VK_IMAGE_USAGE_SAMPLED_BIT;
VK_CHECK_RESULT(vkCreateImage(device, &imageCreateInfo, nullptr, &texture.image));
vkGetImageMemoryRequirements(device, texture.image, &memReqs);
memAllocInfo.allocationSize = memReqs.size;
memAllocInfo.memoryTypeIndex = vulkanDevice->getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
VK_CHECK_RESULT(vkAllocateMemory(device, &memAllocInfo, nullptr, &texture.deviceMemory));
VK_CHECK_RESULT(vkBindImageMemory(device, texture.image, texture.deviceMemory, 0));
VkCommandBuffer copyCmd = vulkanDevice->createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
// Image memory barriers for the texture image
// The sub resource range describes the regions of the image that will be transitioned using the memory barriers below
VkImageSubresourceRange subresourceRange = {};
// Image only contains color data
subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
// Start at first mip level
subresourceRange.baseMipLevel = 0;
// We will transition on all mip levels
subresourceRange.levelCount = texture.mipLevels;
// The 2D texture only has one layer
subresourceRange.layerCount = 1;
// Transition the texture image layout to transfer target, so we can safely copy our buffer data to it.
VkImageMemoryBarrier imageMemoryBarrier = vks::initializers::imageMemoryBarrier();;
imageMemoryBarrier.image = texture.image;
imageMemoryBarrier.subresourceRange = subresourceRange;
imageMemoryBarrier.srcAccessMask = 0;
imageMemoryBarrier.dstAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
imageMemoryBarrier.oldLayout = VK_IMAGE_LAYOUT_UNDEFINED;
imageMemoryBarrier.newLayout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
// Insert a memory dependency at the proper pipeline stages that will execute the image layout transition
// Source pipeline stage is host write/read execution (VK_PIPELINE_STAGE_HOST_BIT)
// Destination pipeline stage is copy command execution (VK_PIPELINE_STAGE_TRANSFER_BIT)
vkCmdPipelineBarrier(
copyCmd,
VK_PIPELINE_STAGE_HOST_BIT,
VK_PIPELINE_STAGE_TRANSFER_BIT,
0,
0, nullptr,
0, nullptr,
1, &imageMemoryBarrier);
// Copy mip levels from staging buffer
vkCmdCopyBufferToImage(
copyCmd,
stagingBuffer,
texture.image,
VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
static_cast<uint32_t>(bufferCopyRegions.size()),
bufferCopyRegions.data());
// Once the data has been uploaded we transfer to the texture image to the shader read layout, so it can be sampled from
imageMemoryBarrier.srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
imageMemoryBarrier.dstAccessMask = VK_ACCESS_SHADER_READ_BIT;
imageMemoryBarrier.oldLayout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
imageMemoryBarrier.newLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
// Insert a memory dependency at the proper pipeline stages that will execute the image layout transition
// Source pipeline stage is copy command execution (VK_PIPELINE_STAGE_TRANSFER_BIT)
// Destination pipeline stage fragment shader access (VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT)
vkCmdPipelineBarrier(
copyCmd,
VK_PIPELINE_STAGE_TRANSFER_BIT,
VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT,
0,
0, nullptr,
0, nullptr,
1, &imageMemoryBarrier);
// Store current layout for later reuse
texture.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
vulkanDevice->flushCommandBuffer(copyCmd, queue, true);
// Clean up staging resources
vkFreeMemory(device, stagingMemory, nullptr);
vkDestroyBuffer(device, stagingBuffer, nullptr);
} else {
// Copy data to a linear tiled image
VkImage mappableImage;
VkDeviceMemory mappableMemory;
// Load mip map level 0 to linear tiling image
VkImageCreateInfo imageCreateInfo = vks::initializers::imageCreateInfo();
imageCreateInfo.imageType = VK_IMAGE_TYPE_2D;
imageCreateInfo.format = format;
imageCreateInfo.mipLevels = 1;
imageCreateInfo.arrayLayers = 1;
imageCreateInfo.samples = VK_SAMPLE_COUNT_1_BIT;
imageCreateInfo.tiling = VK_IMAGE_TILING_LINEAR;
imageCreateInfo.usage = VK_IMAGE_USAGE_SAMPLED_BIT;
imageCreateInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
imageCreateInfo.initialLayout = VK_IMAGE_LAYOUT_PREINITIALIZED;
imageCreateInfo.extent = { texture.width, texture.height, 1 };
VK_CHECK_RESULT(vkCreateImage(device, &imageCreateInfo, nullptr, &mappableImage));
// Get memory requirements for this image like size and alignment
vkGetImageMemoryRequirements(device, mappableImage, &memReqs);
// Set memory allocation size to required memory size
memAllocInfo.allocationSize = memReqs.size;
// Get memory type that can be mapped to host memory
memAllocInfo.memoryTypeIndex = vulkanDevice->getMemoryType(memReqs.memoryTypeBits, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
VK_CHECK_RESULT(vkAllocateMemory(device, &memAllocInfo, nullptr, &mappableMemory));
VK_CHECK_RESULT(vkBindImageMemory(device, mappableImage, mappableMemory, 0));
// Map image memory
void *data;
VK_CHECK_RESULT(vkMapMemory(device, mappableMemory, 0, memReqs.size, 0, &data));
// Copy image data of the first mip level into memory
memcpy(data, ktxTextureData, memReqs.size);
vkUnmapMemory(device, mappableMemory);
// Linear tiled images don't need to be staged and can be directly used as textures
texture.image = mappableImage;
texture.deviceMemory = mappableMemory;
texture.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
// Setup image memory barrier transfer image to shader read layout
VkCommandBuffer copyCmd = vulkanDevice->createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
// The sub resource range describes the regions of the image we will be transition
VkImageSubresourceRange subresourceRange = {};
subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
subresourceRange.baseMipLevel = 0;
subresourceRange.levelCount = 1;
subresourceRange.layerCount = 1;
// Transition the texture image layout to shader read, so it can be sampled from
VkImageMemoryBarrier imageMemoryBarrier = vks::initializers::imageMemoryBarrier();;
imageMemoryBarrier.image = texture.image;
imageMemoryBarrier.subresourceRange = subresourceRange;
imageMemoryBarrier.srcAccessMask = VK_ACCESS_HOST_WRITE_BIT;
imageMemoryBarrier.dstAccessMask = VK_ACCESS_SHADER_READ_BIT;
imageMemoryBarrier.oldLayout = VK_IMAGE_LAYOUT_PREINITIALIZED;
imageMemoryBarrier.newLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
// Insert a memory dependency at the proper pipeline stages that will execute the image layout transition
// Source pipeline stage is host write/read execution (VK_PIPELINE_STAGE_HOST_BIT)
// Destination pipeline stage fragment shader access (VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT)
vkCmdPipelineBarrier(
copyCmd,
VK_PIPELINE_STAGE_HOST_BIT,
VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT,
0,
0, nullptr,
0, nullptr,
1, &imageMemoryBarrier);
vulkanDevice->flushCommandBuffer(copyCmd, queue, true);
}
)
