From 305ca0a09d4e750186b5190432de47f3493e806a Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Wed, 27 Oct 2021 23:37:24 +0800
Subject: *GfxDevice

---
 Runtime/Graphics/GPUDataBuffer.h | 75 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 Runtime/Graphics/GPUDataBuffer.h

(limited to 'Runtime/Graphics/GPUDataBuffer.h')

diff --git a/Runtime/Graphics/GPUDataBuffer.h b/Runtime/Graphics/GPUDataBuffer.h
new file mode 100644
index 0000000..f66d951
--- /dev/null
+++ b/Runtime/Graphics/GPUDataBuffer.h
@@ -0,0 +1,75 @@
+#ifndef GPU_DATABUFFER_H
+#define GPU_DATABUFFER_H
+
+#include <vector>
+
+#include "../Utilities/Type.h"
+#include "../Utilities/Singleton.h"
+#include "../Utilities/UtilMacros.h"
+#include "../Utilities/Assert.h"
+#include "OpenGL.h"
+
+namespace GPU
+{
+
+	class DataBuffer
+	{
+	public:
+		void Upload(int offset, int size, const void* data);
+		void* Map(uint32 access);
+		void* MapRange(int offset, int size, uint32 access); // ÐÔÄÜ×î¼Ñ
+		void FlushMapedRange(int offset, int size);
+
+		void UnMap();
+
+		void Orphan();
+
+		void Restore(int size, GLenum usage);
+		void RestoreWithData(int size, GLenum usage, const void* data);
+
+		GET(int, Size, m_Size);
+		GET(GLenum, Usage, m_Usage);
+		GET(GLuint, Handle, m_Handle);
+
+	private:
+		friend class BufferPool;
+
+		DataBuffer();
+		~DataBuffer();
+
+		GLuint m_Handle;
+		int    m_Size;
+		GLenum m_Usage;
+	};
+
+	class BufferPool : public Singleton<BufferPool>
+	{
+	public:
+		BufferPool();
+		~BufferPool();
+
+		DataBuffer* ClaimBuffer(int size, GLenum usage);
+		void ReleaseBuffer(DataBuffer* buffer);
+
+		void OnEndFrame();
+
+	private:
+		static const int kSizeClassBaseLog2 = 10;
+		static const int kSizeClassStepLog2 = 1;
+		static const int kSizeClassCount = 7;
+
+		int GetSizeClassLimit(int classNdx);
+		void UpdatePendingBuffersArray();
+		void InsertToLive(DataBuffer* buffer);
+		uint GetSizeClass(uint bufferSize);
+
+		std::vector<DataBuffer*> m_LiveBuffers[kSizeClassCount];
+
+	};
+
+	DataBuffer* ClaimBuffer(int size = 0, GLenum usage = GL_ARRAY_BUFFER);
+	void ReleaseBuffer(DataBuffer* buffer);
+
+}
+
+#endif
\ No newline at end of file
-- 
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