[vk] Experimental StreamBuffer Changes

The barrier before the CPU-upload copy was using VK_PIPELINE_STAGE_HOST_BIT. Validation rules only allow HOST as the source stage if you’re also specifying host-side access flags; inside a command buffer the GPU isn’t executing “host work,” so pairing that stage with the usual image layout transition is technically invalid.

Switching the source stage to VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT keeps the ordering guarantee we need and satisfies the spec, while the actual host visibility is still handled correctly by the preceding vmaFlushAllocation.

Co-authored-by: Ribbit <ribbit@placeholder.com>
Reviewed-on: #2681
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Shinmegumi <shinmegumi@eden-emu.dev>
Co-authored-by: Ribbit <ribbit@eden-emu.dev>
Co-committed-by: Ribbit <ribbit@eden-emu.dev>

src/video_core/renderer_vulkan/present/layer.cpp

@@ -332,7 +332,7 @@ void Layer::UpdateRawImage(const Tegra::FramebufferConfig& framebuffer, size_t i
         write_barrier.dstAccessMask = VK_ACCESS_SHADER_READ_BIT;
         write_barrier.oldLayout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
 
-        cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_HOST_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, 0,
+        cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT, 0,
                                read_barrier);
         cmdbuf.CopyBufferToImage(*buffer, image, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, copy);
         cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_TRANSFER_BIT,

src/video_core/renderer_vulkan/vk_present_manager.cpp

@@ -412,7 +412,7 @@ void PresentManager::CopyToSwapchainImpl(Frame* frame) {
             .sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,
             .pNext = nullptr,
             .srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT,
-            .dstAccessMask = VK_ACCESS_MEMORY_READ_BIT,
+            .dstAccessMask = 0,
             .oldLayout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
             .newLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR,
             .srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED,
@@ -460,7 +460,7 @@ void PresentManager::CopyToSwapchainImpl(Frame* frame) {
                          MakeImageCopy(frame->width, frame->height, extent.width, extent.height));
     }
 
-    cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_ALL_GRAPHICS_BIT, {},
+    cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT, {},
                            {}, {}, post_barriers);
 
     cmdbuf.End();

src/video_core/renderer_vulkan/vk_texture_cache.cpp

@@ -1068,7 +1068,7 @@ void TextureCacheRuntime::ReinterpretImage(Image& dst, Image& src,
 
         cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_ALL_COMMANDS_BIT, VK_PIPELINE_STAGE_TRANSFER_BIT,
                                0, READ_BARRIER, {}, middle_out_barrier);
-        cmdbuf.CopyBufferToImage(copy_buffer, dst_image, VK_IMAGE_LAYOUT_GENERAL, vk_out_copies);
+        cmdbuf.CopyBufferToImage(copy_buffer, dst_image, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, vk_out_copies);
         cmdbuf.PipelineBarrier(VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_ALL_COMMANDS_BIT,
                                0, {}, {}, post_barriers);
     });