Refactor TransitionUsage to use abstract TransitionUsageImpl

src/backend/null/NullBackend.cpp

@@ -83,7 +83,7 @@ namespace null {
         return module;
     }
     TextureBase* Device::CreateTexture(TextureBuilder* builder) {
-        return new TextureBase(builder);
+        return new Texture(builder);
     }
     TextureViewBase* Device::CreateTextureView(TextureViewBuilder* builder) {
         return new TextureViewBase(builder);
@@ -149,6 +149,9 @@ namespace null {
     void Buffer::UnmapImpl() {
     }
 
+    void Buffer::TransitionUsageImpl(nxt::BufferUsageBit currentUsage, nxt::BufferUsageBit targetUsage) {
+    }
+
     // Queue
 
     Queue::Queue(QueueBuilder* builder)
@@ -168,5 +171,17 @@ namespace null {
         operations.clear();
     }
 
+    // Texture
+
+    Texture::Texture(TextureBuilder* builder)
+        : TextureBase(builder) {
+    }
+
+    Texture::~Texture() {
+    }
+
+    void Texture::TransitionUsageImpl(nxt::TextureUsageBit currentUsage, nxt::TextureUsageBit targetUsage) {
+    }
+
 }
 }

src/backend/null/NullBackend.h

@@ -52,7 +52,7 @@ namespace null {
     using RenderPass = RenderPassBase;
     using Sampler = SamplerBase;
     using ShaderModule = ShaderModuleBase;
-    using Texture = TextureBase;
+    class Texture;
     using TextureView = TextureViewBase;
 
     struct NullBackendTraits {
@@ -129,6 +129,7 @@ namespace null {
             void SetSubDataImpl(uint32_t start, uint32_t count, const uint32_t* data) override;
             void MapReadAsyncImpl(uint32_t serial, uint32_t start, uint32_t count) override;
             void UnmapImpl() override;
+            void TransitionUsageImpl(nxt::BufferUsageBit currentUsage, nxt::BufferUsageBit targetUsage) override;
 
             std::unique_ptr<char[]> backingData;
     };
@@ -142,6 +143,15 @@ namespace null {
             void Submit(uint32_t numCommands, CommandBuffer* const * commands);
     };
 
+    class Texture : public TextureBase {
+        public:
+            Texture(TextureBuilder* buidler);
+            ~Texture();
+
+        private:
+            void TransitionUsageImpl(nxt::TextureUsageBit currentUsage, nxt::TextureUsageBit targetUsage) override;
+    };
+
 }
 }