Improving Material shader code generation

src/Engine/Graphics/RenderMaterial.h

@@ -0,0 +1,44 @@
+#pragma once
+#include "GraphicsResources.h"
+
+namespace Seele
+{
+namespace Gfx
+{
+class MaterialShaderMap;//TODO implement
+class MaterialRenderContext;
+struct UniformExpressionCache
+{
+    Gfx::PUniformBuffer uniformBuffer;
+    uint8 bUpToDate;
+
+    const MaterialShaderMap* cachedUniformExpressionShaderMap;
+};
+class Material;
+class RenderMaterial
+{
+public:
+    mutable UniformExpressionCache uniformExpressionCache;
+    RenderMaterial();
+    virtual ~RenderMaterial();
+
+    void evaluateUniformExpressions(UniformExpressionCache& outUniforExpressionCache, const MaterialRenderContext& context);
+
+    void cacheUniformExpressions(bool bRecreatueUniformBuffer);
+
+    void invalidateUniformExpressionCache(bool bRecreateUniformBuffer);
+
+    void updateUniformExpressionCacheIfNeeded() const;
+
+    const Material* getMaterial() const
+    {
+        const RenderMaterial* unused = nullptr;
+        return &getMaterialWithFallback(unused);
+    }
+
+    virtual const Material& getMaterialWithFallback(const RenderMaterial*& outFallbackRenderMaterial) const = 0;
+
+    virtual Material* getMaterialNoFallback() const { return nullptr; }
+};
+} // namespace Gfx
+} // namespace Seele