1 files changed, 160 insertions, 0 deletions
diff --git a/Runtime/Graphics/GPUDataBuffers.h b/Runtime/Graphics/GPUDataBuffers.h
new file mode 100644
index 0000000..62e0413
--- /dev/null
+++ b/Runtime/Graphics/GPUDataBuffers.h
@@ -0,0 +1,160 @@
+#pragma once
+
+#include <vector>
+
+#include "Runtime/Lua/LuaHelper.h"
+#include "../Utilities/Type.h"
+#include "../Utilities/Singleton.h"
+#include "../Utilities/UtilMacros.h"
+#include "../Utilities/Assert.h"
+#include "OpenGL.h"
+
+template<typename T>
+// GPU侧的通用缓冲区，最底层的实现
+class GPUDataBuffer
+{
+public:
+    GPUDataBuffer(GLenum target, GLenum usage)/*throw GLException*/
+        : m_Target(target)
+        , m_Usage(usage)
+    {
+        glGenBuffers(1, &m_Handle);
+
+        CheckGLError(
+            glDeleteBuffers(1, &m_Handle);
+        throw GLException(error);
+        );
+    }
+    virtual ~GPUDataBuffer()
+    {
+        glDeleteBuffers(1, &m_Handle);
+    }
+
+    // 提交\更新缓冲区数据
+    void Upload(int offset, int size, const T* data)
+    {
+        glBindBuffer(m_Target, m_Handle);
+        glBufferSubData(m_Target, offset, size, data);
+        glBindBuffer(m_Target, 0);
+    }
+
+    // 更新缓冲区数据（性能优于Upload）
+    T* Map(uint32 access)
+    {
+        glBindBuffer(m_Target, m_Handle);
+        void* ptr = glMapBuffer(m_Target, access);
+        glBindBuffer(m_Target, 0);
+        return ptr;
+    }
+    T* MapRange(int offset, int size, uint32 access) // 性能最佳
+    {
+        glBindBuffer(m_Target, m_Handle);
+        void* ptr = glMapBufferRange(m_Target, offset, size, access);
+        glBindBuffer(m_Target, 0);
+        return ptr;
+    }
+    void FlushMapedRange(int offset, int size)
+    {
+        glBindBuffer(m_Target, m_Handle);
+        glFlushMappedBufferRange(m_Target, offset, size);
+        glBindBuffer(m_Target, 0);
+    }
+    void UnMap()
+    {
+        glBindBuffer(m_Target, m_Handle);
+        glUnmapBuffer(m_Target);
+        glBindBuffer(m_Target, 0);
+    }
+
+    // 重置缓冲区
+    void Restore(int size, GLenum usage)
+    {
+        RestoreWithData(size, usage, 0);
+    }
+    void RestoreWithData(int size, GLenum usage, const T* data)
+    {
+        glBindBuffer(m_Target, m_Handle);
+        glBufferData(m_Target, size, data, usage);
+        glBindBuffer(m_Target, 0);
+        m_Size = size;
+        m_Usage = usage;
+    }
+
+    void Orphan()
+    {
+        glBindBuffer(m_Target, m_Handle);
+        glBufferData(m_Target, 0, 0, GL_STREAM_DRAW);
+        glBindBuffer(m_Target, 0);
+    }
+
+    int GetComponentSize() 
+    {
+        return sizeof(T);
+    }
+
+	GET(int, Size, m_Size);
+	GET(GLenum, Usage, m_Usage);
+	GET(GLuint, Handle, m_Handle);
+
+protected:
+	GLuint m_Handle;
+
+    GLenum m_Target;
+	GLenum m_Usage;
+
+    int m_Size;
+
+};
+
+struct VertexAttributeDescriptor
+{
+    int index; // attribute layout index //glBindAttribLocation
+    int numOfComponents; // 1,2,3,4
+    int stride;
+};
+
+struct VertexDataLayout
+{
+    std::vector<VertexAttributeDescriptor> attributes;
+};
+
+class DynamicVBO;
+//顶点数据流
+class VBO : public GPUDataBuffer<float>
+{
+public:
+    VBO();
+    virtual ~VBO();
+
+    void AddVertexAttribute(int index, int numOfComps, int stride);
+    void AddVertexAttribute(VertexAttributeDescriptor& attribute);
+    int GetVertexAttributesCount();
+    void ClearVertexAttribute();
+
+    static const GLenum componentType = GL_FLOAT;
+
+protected: 
+    friend class DynamicVBO;
+    VBO(GLenum usage);
+
+    VertexDataLayout m_Layout;
+
+};
+
+// 频繁读写的共享vbo
+class DynamicVBO : public VBO
+{
+public:
+    DynamicVBO();
+    ~DynamicVBO();
+
+};
+
+// 索引数据流
+class IBO : GPUDataBuffer<UInt16>
+{
+public:
+    static const GLenum componentType = GL_UNSIGNED_SHORT;
+
+
+};
+\ No newline at end of file