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.cpp | 94 +++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 source/modules/asura-core/graphics/gpu_buffer.cpp

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

diff --git a/source/modules/asura-core/graphics/gpu_buffer.cpp b/source/modules/asura-core/graphics/gpu_buffer.cpp
new file mode 100644
index 0000000..c796bb0
--- /dev/null
+++ b/source/modules/asura-core/graphics/gpu_buffer.cpp
@@ -0,0 +1,94 @@
+#include "gpu_buffer.h"
+
+namespace AsuraEngine
+{
+	namespace Graphics
+	{
+
+		GPUBuffer::GPUBuffer(BufferType type, BufferUsage usage, size_t size)
+			: mTarget(GL_ZERO)
+			, mBuffer(GL_ZERO)
+			, mSize(0)
+#if ASURA_DEBUG 
+			, mData(nullptr)
+#endif
+		{
+			switch (type)
+			{
+			case BUFFER_TYPE_VERTEX:
+				mTarget = GL_ARRAY_BUFFER;
+				break;
+			case BUFFER_TYPE_INDEX:
+				mTarget = GL_ELEMENT_ARRAY_BUFFER;
+				break;
+			}
+			switch (usage)
+			{
+			case BUFFER_USAGE_STREAM:
+				mUsage = GL_STREAM_DRAW;
+				break;
+			case BUFFER_USAGE_DYNAMIC:
+				mUsage = GL_DYNAMIC_DRAW;
+				break;
+			case BUFFER_USAGE_STATIC:
+				mUsage = GL_STATIC_DRAW;
+				break;
+			}
+			gl.WipeError();
+			glGenBuffers(1, &mBuffer);
+			if (mBuffer == 0)
+				throw Exception("OpenGL glGenBuffers failed.");
+			glBindBuffer(mTarget, mBuffer);
+			glBufferData(mTarget, size, NULL, mUsage); // 初始化大小为size的缓冲
+			if (gl.HasError())
+				throw Exception("OpenGL glBufferData failed. Errorcode=%d.", gl.GetError());
+			glBindBuffer(mTarget, 0);
+#if ASURA_DEBUG 
+			mData = (byte*)malloc(size);
+			memset(mData, 0, size);
+#endif
+			mSize = size;
+		}
+
+		GPUBuffer::~GPUBuffer()
+		{
+#if ASURA_DEBUG 
+			if (mData)
+				free(mData);
+#endif
+			glDeleteBuffers(1, &mBuffer);
+		}
+
+		bool GPUBuffer::Fill(const void * data, size_t size, uint offset)
+		{
+			if (data == nullptr)
+				return false;
+			glBindBuffer(mTarget, mBuffer);
+			glBufferSubData(mTarget, offset, size, data);
+			if (gl.HasError())
+				throw Exception("OpenGL glBufferSubData failed. Errorcode=%d.", gl.GetError());
+			glBindBuffer(mTarget, 0);
+#if ASURA_DEBUG
+			// 拷贝一份，调试用
+			memcpy(mData + offset, data, size);
+#endif
+			return true;
+		}
+
+		void GPUBuffer::Bind()
+		{
+			glBindBuffer(mTarget, mBuffer);
+		}
+
+		void GPUBuffer::UnBind()
+		{
+			glBindBuffer(mTarget, 0);
+		}
+
+		uint GPUBuffer::GetBufferSize()
+		{
+			return mSize; 
+		}
+
+	}
+}
\ No newline at end of file
-- 
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