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karnkaulkarnkaul
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Sampled image
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‎guide/src/memory/images.md‎

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@@ -81,3 +81,101 @@ auto vma::create_image(ImageCreateInfo const& create_info,
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};
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}
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```
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For creating sampled images, we need both the image bytes and size (extent). Wrap that into a struct:
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```cpp
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struct Bitmap {
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std::span<std::byte const> bytes{};
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glm::ivec2 size{};
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};
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```
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The creation process is similar to device buffers: requiring a staging copy, but it also needs layout transitions. In short:
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1. Create the image and staging buffer
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1. Transition the layout from Undefined to TransferDst
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1. Record a buffer image copy operation
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1. Transition the layout from TransferDst to ShaderReadOnlyOptimal
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```cpp
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auto vma::create_sampled_image(ImageCreateInfo const& create_info,
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CommandBlock command_block, Bitmap const& bitmap)
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-> Image {
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// create image.
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// no mip-mapping right now: 1 level.
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auto const mip_levels = 1u;
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auto const usize = glm::uvec2{bitmap.size};
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auto const extent = vk::Extent2D{usize.x, usize.y};
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auto const usage =
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vk::ImageUsageFlagBits::eTransferDst | vk::ImageUsageFlagBits::eSampled;
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auto ret = create_image(create_info, usage, mip_levels,
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vk::Format::eR8G8B8A8Srgb, extent);
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// create staging buffer.
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auto const buffer_ci = BufferCreateInfo{
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.allocator = create_info.allocator,
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.usage = vk::BufferUsageFlagBits::eTransferSrc,
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.queue_family = create_info.queue_family,
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};
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auto const staging_buffer = create_buffer(buffer_ci, BufferMemoryType::Host,
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bitmap.bytes.size_bytes());
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// can't do anything if either creation failed.
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if (!ret.get().image || !staging_buffer.get().buffer) { return {}; }
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// copy bytes into staging buffer.
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std::memcpy(staging_buffer.get().mapped, bitmap.bytes.data(),
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bitmap.bytes.size_bytes());
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// transition image for transfer.
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auto dependency_info = vk::DependencyInfo{};
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auto subresource_range = vk::ImageSubresourceRange{};
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subresource_range.setAspectMask(vk::ImageAspectFlagBits::eColor)
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.setLayerCount(1)
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.setLevelCount(mip_levels);
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auto barrier = vk::ImageMemoryBarrier2{};
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barrier.setImage(ret.get().image)
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.setSrcQueueFamilyIndex(create_info.queue_family)
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.setDstQueueFamilyIndex(create_info.queue_family)
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.setOldLayout(vk::ImageLayout::eUndefined)
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.setNewLayout(vk::ImageLayout::eTransferDstOptimal)
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.setSubresourceRange(subresource_range)
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.setSrcStageMask(vk::PipelineStageFlagBits2::eTopOfPipe)
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.setSrcAccessMask(vk::AccessFlagBits2::eNone)
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.setDstStageMask(vk::PipelineStageFlagBits2::eTransfer)
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.setDstAccessMask(vk::AccessFlagBits2::eMemoryRead |
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vk::AccessFlagBits2::eMemoryWrite);
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dependency_info.setImageMemoryBarriers(barrier);
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command_block.command_buffer().pipelineBarrier2(dependency_info);
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auto buffer_image_copy = vk::BufferImageCopy2{};
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auto subresource_layers = vk::ImageSubresourceLayers{};
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subresource_layers.setAspectMask(vk::ImageAspectFlagBits::eColor)
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.setLayerCount(1)
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.setLayerCount(mip_levels);
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buffer_image_copy.setImageSubresource(subresource_layers)
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.setImageExtent(vk::Extent3D{extent.width, extent.height, 1});
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auto copy_info = vk::CopyBufferToImageInfo2{};
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copy_info.setDstImage(ret.get().image)
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.setDstImageLayout(vk::ImageLayout::eTransferDstOptimal)
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.setSrcBuffer(staging_buffer.get().buffer)
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.setRegions(buffer_image_copy);
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command_block.command_buffer().copyBufferToImage2(copy_info);
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// transition image for sampling.
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barrier.setOldLayout(barrier.newLayout)
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.setNewLayout(vk::ImageLayout::eShaderReadOnlyOptimal)
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.setSrcStageMask(barrier.dstStageMask)
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.setSrcAccessMask(barrier.dstAccessMask)
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.setDstStageMask(vk::PipelineStageFlagBits2::eAllGraphics)
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.setDstAccessMask(vk::AccessFlagBits2::eMemoryRead |
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vk::AccessFlagBits2::eMemoryWrite);
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dependency_info.setImageMemoryBarriers(barrier);
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command_block.command_buffer().pipelineBarrier2(dependency_info);
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command_block.submit_and_wait();
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return ret;
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}
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```

‎src/bitmap.hpp‎

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#pragma once
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#include <glm/vec2.hpp>
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#include <cstddef>
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#include <span>
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namespace lvk {
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struct Bitmap {
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std::span<std::byte const> bytes{};
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glm::ivec2 size{};
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};
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} // namespace lvk

‎src/vma.cpp‎

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@@ -175,4 +175,84 @@ auto vma::create_image(ImageCreateInfo const& create_info,
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.levels = levels,
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};
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}
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auto vma::create_sampled_image(ImageCreateInfo const& create_info,
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CommandBlock command_block, Bitmap const& bitmap)
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-> Image {
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// create image.
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// no mip-mapping right now: 1 level.
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auto const mip_levels = 1u;
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auto const usize = glm::uvec2{bitmap.size};
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auto const extent = vk::Extent2D{usize.x, usize.y};
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auto const usage =
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vk::ImageUsageFlagBits::eTransferDst | vk::ImageUsageFlagBits::eSampled;
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auto ret = create_image(create_info, usage, mip_levels,
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vk::Format::eR8G8B8A8Srgb, extent);
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// create staging buffer.
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auto const buffer_ci = BufferCreateInfo{
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.allocator = create_info.allocator,
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.usage = vk::BufferUsageFlagBits::eTransferSrc,
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.queue_family = create_info.queue_family,
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};
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auto const staging_buffer = create_buffer(buffer_ci, BufferMemoryType::Host,
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bitmap.bytes.size_bytes());
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// can't do anything if either creation failed.
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if (!ret.get().image || !staging_buffer.get().buffer) { return {}; }
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// copy bytes into staging buffer.
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std::memcpy(staging_buffer.get().mapped, bitmap.bytes.data(),
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bitmap.bytes.size_bytes());
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// transition image for transfer.
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auto dependency_info = vk::DependencyInfo{};
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auto subresource_range = vk::ImageSubresourceRange{};
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subresource_range.setAspectMask(vk::ImageAspectFlagBits::eColor)
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.setLayerCount(1)
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.setLevelCount(mip_levels);
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auto barrier = vk::ImageMemoryBarrier2{};
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barrier.setImage(ret.get().image)
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.setSrcQueueFamilyIndex(create_info.queue_family)
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.setDstQueueFamilyIndex(create_info.queue_family)
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.setOldLayout(vk::ImageLayout::eUndefined)
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.setNewLayout(vk::ImageLayout::eTransferDstOptimal)
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.setSubresourceRange(subresource_range)
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.setSrcStageMask(vk::PipelineStageFlagBits2::eTopOfPipe)
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.setSrcAccessMask(vk::AccessFlagBits2::eNone)
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.setDstStageMask(vk::PipelineStageFlagBits2::eTransfer)
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.setDstAccessMask(vk::AccessFlagBits2::eMemoryRead |
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vk::AccessFlagBits2::eMemoryWrite);
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dependency_info.setImageMemoryBarriers(barrier);
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command_block.command_buffer().pipelineBarrier2(dependency_info);
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auto buffer_image_copy = vk::BufferImageCopy2{};
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auto subresource_layers = vk::ImageSubresourceLayers{};
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subresource_layers.setAspectMask(vk::ImageAspectFlagBits::eColor)
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.setLayerCount(1)
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.setLayerCount(mip_levels);
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buffer_image_copy.setImageSubresource(subresource_layers)
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.setImageExtent(vk::Extent3D{extent.width, extent.height, 1});
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auto copy_info = vk::CopyBufferToImageInfo2{};
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copy_info.setDstImage(ret.get().image)
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.setDstImageLayout(vk::ImageLayout::eTransferDstOptimal)
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.setSrcBuffer(staging_buffer.get().buffer)
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.setRegions(buffer_image_copy);
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command_block.command_buffer().copyBufferToImage2(copy_info);
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// transition image for sampling.
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barrier.setOldLayout(barrier.newLayout)
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.setNewLayout(vk::ImageLayout::eShaderReadOnlyOptimal)
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.setSrcStageMask(barrier.dstStageMask)
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.setSrcAccessMask(barrier.dstAccessMask)
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.setDstStageMask(vk::PipelineStageFlagBits2::eAllGraphics)
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.setDstAccessMask(vk::AccessFlagBits2::eMemoryRead |
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vk::AccessFlagBits2::eMemoryWrite);
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dependency_info.setImageMemoryBarriers(barrier);
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command_block.command_buffer().pipelineBarrier2(dependency_info);
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command_block.submit_and_wait();
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return ret;
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}
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} // namespace lvk

‎src/vma.hpp‎

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#pragma once
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#include <vk_mem_alloc.h>
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#include <bitmap.hpp>
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#include <command_block.hpp>
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#include <scoped.hpp>
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#include <vulkan/vulkan.hpp>
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vk::ImageUsageFlags usage, std::uint32_t levels,
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vk::Format format, vk::Extent2D extent)
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-> Image;
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[[nodiscard]] auto create_sampled_image(ImageCreateInfo const& create_info,
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CommandBlock command_block,
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Bitmap const& bitmap) -> Image;
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} // namespace lvk::vma

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