Add GPUDevice::CreateConstantBuffer for custom constants buffers usage

Source/Engine/GraphicsDevice/Null/GPUDeviceNull.cpp

@@ -189,6 +189,11 @@ GPUSwapChain* GPUDeviceNull::CreateSwapChain(Window* window)
     return New<GPUSwapChainNull>(window);
 }
 
+GPUConstantBuffer* GPUDeviceNull::CreateConstantBuffer(uint32 size, const StringView& name)
+{
+    return nullptr;
+}
+
 GPUDevice* CreateGPUDeviceNull()
 {
     return GPUDeviceNull::Create();

Source/Engine/GraphicsDevice/Null/GPUDeviceNull.h

@@ -48,6 +48,7 @@ public:
     GPUBuffer* CreateBuffer(const StringView& name) override;
     GPUSampler* CreateSampler() override;
     GPUSwapChain* CreateSwapChain(Window* window) override;
+    GPUConstantBuffer* CreateConstantBuffer(uint32 size, const StringView& name) override;
 };
 
 extern GPUDevice* CreateGPUDeviceNull();

Source/Engine/GraphicsDevice/Null/GPUShaderNull.h

@@ -19,11 +19,6 @@ protected:
         return nullptr;
     }
 
-    GPUConstantBuffer* CreateCB(const String& name, uint32 size, MemoryReadStream& stream) override
-    {
-        return nullptr;
-    }
-
 public:
 
     // [GPUShader]