From a595e9e8a7a6a742481b1cd05455d3c639095413 Mon Sep 17 00:00:00 2001
From: Liam <byteslice@airmail.cc>
Date: Mon, 22 Jan 2024 12:40:50 -0500
Subject: nvnflinger/gpu: implement layer stack composition

---
 src/video_core/renderer_vulkan/present/util.cpp | 78 +++++++++++++++++++++++++
 1 file changed, 78 insertions(+)

(limited to 'src/video_core/renderer_vulkan/present/util.cpp')

diff --git a/src/video_core/renderer_vulkan/present/util.cpp b/src/video_core/renderer_vulkan/present/util.cpp
index 7bff1c436..6ee16595d 100644
--- a/src/video_core/renderer_vulkan/present/util.cpp
+++ b/src/video_core/renderer_vulkan/present/util.cpp
@@ -7,6 +7,20 @@
 
 namespace Vulkan {
 
+vk::Buffer CreateWrappedBuffer(MemoryAllocator& allocator, VkDeviceSize size, MemoryUsage usage) {
+    const VkBufferCreateInfo dst_buffer_info{
+        .sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
+        .pNext = nullptr,
+        .flags = 0,
+        .size = size,
+        .usage = VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT,
+        .sharingMode = VK_SHARING_MODE_EXCLUSIVE,
+        .queueFamilyIndexCount = 0,
+        .pQueueFamilyIndices = nullptr,
+    };
+    return allocator.CreateBuffer(dst_buffer_info, usage);
+}
+
 vk::Image CreateWrappedImage(MemoryAllocator& allocator, VkExtent2D dimensions, VkFormat format) {
     const VkImageCreateInfo image_ci{
         .sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
@@ -96,6 +110,70 @@ void UploadImage(const Device& device, MemoryAllocator& allocator, Scheduler& sc
     scheduler.Finish();
 }
 
+void DownloadColorImage(vk::CommandBuffer& cmdbuf, VkImage image, VkBuffer buffer,
+                        VkExtent3D extent) {
+    const VkImageMemoryBarrier read_barrier{
+        .sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,
+        .pNext = nullptr,
+        .srcAccessMask = VK_ACCESS_MEMORY_WRITE_BIT,
+        .dstAccessMask = VK_ACCESS_TRANSFER_READ_BIT,
+        .oldLayout = VK_IMAGE_LAYOUT_GENERAL,
+        .newLayout = VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
+        .srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
+        .dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
+        .image = image,
+        .subresourceRange{
+            .aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
+            .baseMipLevel = 0,
+            .levelCount = VK_REMAINING_MIP_LEVELS,
+            .baseArrayLayer = 0,
+            .layerCount = VK_REMAINING_ARRAY_LAYERS,
+        },
+    };
+    const VkImageMemoryBarrier image_write_barrier{
+        .sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,
+        .pNext = nullptr,
+        .srcAccessMask = 0,
+        .dstAccessMask = VK_ACCESS_MEMORY_WRITE_BIT,
+        .oldLayout = VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
+        .newLayout = VK_IMAGE_LAYOUT_GENERAL,
+        .srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
+        .dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
+        .image = image,
+        .subresourceRange{
+            .aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
+            .baseMipLevel = 0,
+            .levelCount = VK_REMAINING_MIP_LEVELS,
+            .baseArrayLayer = 0,
+            .layerCount = VK_REMAINING_ARRAY_LAYERS,
+        },
+    };
+    static constexpr VkMemoryBarrier memory_write_barrier{
+        .sType = VK_STRUCTURE_TYPE_MEMORY_BARRIER,
+        .pNext = nullptr,
+        .srcAccessMask = VK_ACCESS_MEMORY_WRITE_BIT,
+        .dstAccessMask = VK_ACCESS_MEMORY_READ_BIT | VK_ACCESS_MEMORY_WRITE_BIT,
+    };
+    const VkBufferImageCopy copy{
+        .bufferOffset = 0,
+        .bufferRowLength = 0,
+        .bufferImageHeight = 0,
+        .imageSubresource{
+            .aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
+            .mipLevel = 0,
+            .baseArrayLayer = 0,
+            .layerCount = 1,
+        },
+        .imageOffset{.x = 0, .y = 0, .z = 0},
+        .imageExtent{extent},
+    };
+    cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_ALL_COMMANDS_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, 0,
+                           read_barrier);
+    cmdbuf.CopyImageToBuffer(image, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL, buffer, copy);
+    cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_ALL_COMMANDS_BIT, 0,
+                           memory_write_barrier, nullptr, image_write_barrier);
+}
+
 vk::ImageView CreateWrappedImageView(const Device& device, vk::Image& image, VkFormat format) {
     return device.GetLogical().CreateImageView(VkImageViewCreateInfo{
         .sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
-- 
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