vk_buffer_cache: Add transform feedback usage to buffers

src/video_core/renderer_vulkan/vk_buffer_cache.cpp

@@ -60,6 +60,27 @@ std::array<T, 6> MakeQuadIndices(u32 quad, u32 first) {
     }
     return indices;
 }
+
+vk::Buffer CreateBuffer(const Device& device, u64 size) {
+    VkBufferUsageFlags flags =
+        VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT |
+        VK_BUFFER_USAGE_UNIFORM_TEXEL_BUFFER_BIT | VK_BUFFER_USAGE_STORAGE_TEXEL_BUFFER_BIT |
+        VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT | VK_BUFFER_USAGE_STORAGE_BUFFER_BIT |
+        VK_BUFFER_USAGE_INDEX_BUFFER_BIT | VK_BUFFER_USAGE_VERTEX_BUFFER_BIT;
+    if (device.IsExtTransformFeedbackSupported()) {
+        flags |= VK_BUFFER_USAGE_TRANSFORM_FEEDBACK_BUFFER_BIT_EXT;
+    }
+    return device.GetLogical().CreateBuffer({
+        .sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
+        .pNext = nullptr,
+        .flags = 0,
+        .size = size,
+        .usage = flags,
+        .sharingMode = VK_SHARING_MODE_EXCLUSIVE,
+        .queueFamilyIndexCount = 0,
+        .pQueueFamilyIndices = nullptr,
+    });
+}
 } // Anonymous namespace
 
 Buffer::Buffer(BufferCacheRuntime&, VideoCommon::NullBufferParams null_params)
@@ -68,21 +89,7 @@ Buffer::Buffer(BufferCacheRuntime&, VideoCommon::NullBufferParams null_params)
 Buffer::Buffer(BufferCacheRuntime& runtime, VideoCore::RasterizerInterface& rasterizer_,
                VAddr cpu_addr_, u64 size_bytes_)
     : VideoCommon::BufferBase<VideoCore::RasterizerInterface>(rasterizer_, cpu_addr_, size_bytes_),
-      device{&runtime.device},
-      buffer{device->GetLogical().CreateBuffer({
-          .sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
-          .pNext = nullptr,
-          .flags = 0,
-          .size = SizeBytes(),
-          .usage = VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT |
-                   VK_BUFFER_USAGE_UNIFORM_TEXEL_BUFFER_BIT |
-                   VK_BUFFER_USAGE_STORAGE_TEXEL_BUFFER_BIT | VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT |
-                   VK_BUFFER_USAGE_STORAGE_BUFFER_BIT | VK_BUFFER_USAGE_INDEX_BUFFER_BIT |
-                   VK_BUFFER_USAGE_VERTEX_BUFFER_BIT,
-          .sharingMode = VK_SHARING_MODE_EXCLUSIVE,
-          .queueFamilyIndexCount = 0,
-          .pQueueFamilyIndices = nullptr,
-      })},
+      device{&runtime.device}, buffer{CreateBuffer(*device, SizeBytes())},
       commit{runtime.memory_allocator.Commit(buffer, MemoryUsage::DeviceLocal)} {
     if (runtime.device.HasDebuggingToolAttached()) {
         buffer.SetObjectNameEXT(fmt::format("Buffer 0x{:x}", CpuAddr()).c_str());