From e47baca4f23db43ec91fbf64d5d06d7c0dbee495 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Sat, 6 Apr 2019 07:39:49 +0800
Subject: *misc

---
 source/modules/asura-core/graphics/gpu_buffer.h | 69 +++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 source/modules/asura-core/graphics/gpu_buffer.h

(limited to 'source/modules/asura-core/graphics/gpu_buffer.h')

diff --git a/source/modules/asura-core/graphics/gpu_buffer.h b/source/modules/asura-core/graphics/gpu_buffer.h
new file mode 100644
index 0000000..aba1157
--- /dev/null
+++ b/source/modules/asura-core/graphics/gpu_buffer.h
@@ -0,0 +1,69 @@
+#ifndef __ASURA_GPU_BUFFER_H__
+#define __ASURA_GPU_BUFFER_H__
+
+#include <asura-utils/exceptions/exception.h>
+#include <asura-utils/type.h>
+
+#include "gl.h"
+
+namespace AsuraEngine
+{
+	namespace Graphics
+	{
+
+		enum BufferType
+		{
+			BUFFER_TYPE_VERTEX, ///< 顶点缓冲
+			BUFFER_TYPE_INDEX,  ///< 索引缓冲
+		};
+
+		enum BufferUsage
+		{
+			BUFFER_USAGE_STREAM,  ///< 修改一次，使用次数低
+			BUFFER_USAGE_DYNAMIC, ///< 修改一次，经常使用
+			BUFFER_USAGE_STATIC,  ///< 经常修改和使用
+		};
+
+		///
+		/// GPU缓冲，分顶点缓冲和索引缓冲两种，避免每次都从内存向显存上传数据。
+		///
+		class GPUBuffer
+		{
+		public:
+
+			GPUBuffer(BufferType type, BufferUsage usage, size_t size) ASURA_THROW(Exception);
+			~GPUBuffer();
+
+			///
+			/// 初始化\更新缓存，如果没有gpu buffer资源，认为是初始化，否则认为是更新。
+			///
+			bool Fill(const void* data, size_t size, uint offset = 0) ASURA_THROW(Exception);
+
+			///
+			/// 绑定到对应的目标上，接下来就可以使用了。
+			///
+			void Bind();
+			void UnBind();
+
+			uint GetBufferSize();
+
+		private: 
+
+			GLenum mTarget;
+			GLuint mBuffer;
+			GLuint mUsage; 
+			uint   mSize;
+
+#if ASURA_DEBUG
+			///
+			/// 本地保存的buffer数据，和显存数据保持一致，用来调试和更新显存。
+			///
+			byte* mData; 
+#endif
+
+		};
+
+	}
+}
+
+#endif
\ No newline at end of file
-- 
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