vk_compute_pass: Fix pipeline barriers on non-initialized ASTC images

src/video_core/renderer_vulkan/vk_compute_pass.cpp

@@ -411,7 +411,7 @@ void ASTCDecoderPass::Assemble(Image& image, const StagingBufferRef& map,
             const VkImageMemoryBarrier image_barrier{
                 .sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,
                 .pNext = nullptr,
-                .srcAccessMask = VK_ACCESS_SHADER_WRITE_BIT,
+                .srcAccessMask = is_initialized ? VK_ACCESS_SHADER_WRITE_BIT : VkAccessFlags{},
                 .dstAccessMask = VK_ACCESS_SHADER_READ_BIT | VK_ACCESS_SHADER_WRITE_BIT,
                 .oldLayout = is_initialized ? VK_IMAGE_LAYOUT_GENERAL : VK_IMAGE_LAYOUT_UNDEFINED,
                 .newLayout = VK_IMAGE_LAYOUT_GENERAL,
@@ -426,7 +426,8 @@ void ASTCDecoderPass::Assemble(Image& image, const StagingBufferRef& map,
                     .layerCount = VK_REMAINING_ARRAY_LAYERS,
                 },
             };
-            cmdbuf.PipelineBarrier(is_initialized ? VK_PIPELINE_STAGE_ALL_COMMANDS_BIT : 0,
+            cmdbuf.PipelineBarrier(is_initialized ? VK_PIPELINE_STAGE_ALL_COMMANDS_BIT
+                                                  : VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
                                    VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT, 0, image_barrier);
             cmdbuf.BindPipeline(VK_PIPELINE_BIND_POINT_COMPUTE, vk_pipeline);
         });