93 lines
4.9 KiB
C++
93 lines
4.9 KiB
C++
#ifndef HGL_GRAPH_VERTEX_BUFFER_OBJECT_INCLUDE
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#define HGL_GRAPH_VERTEX_BUFFER_OBJECT_INCLUDE
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#include<GLEWCore/glew.h>
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#include<hgl/type/DataType.h>
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namespace hgl
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{
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namespace graph
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{
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/**
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* 顶点缓冲区对象，对应OpenGL的VBO管理
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*/
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class VertexBufferObject
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{
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protected:
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GLuint buffer_index;
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void * data;
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void * data_end;
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GLenum buffer_type; ///<缓冲区类型(GL_ARRAY_BUFFER,GL_ELEMENT_ARRAY_BUFFER等)
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GLenum user_pattern; ///<数据存储区使用模式(GL_STATIC_DRAW,GL_DYNAMIC_DRAW等)
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GLenum data_type; ///<单个数据类型 (GL_BYTE,GL_UNSIGNED_SHORT,GL_FLOAT等)
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uint data_bytes; ///<单个数据字节数 (GL_BYTE为1,GL_UNSIGNED_SHORT为2GL_FLOAT为4等)
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uint data_comp; ///<数据成员数 (1/2/3/4，如2D纹理坐标用2，3D坐标/法线用3)
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GLsizeiptr data_count; ///<数据数量
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GLsizeiptr total_bytes; ///<数据总字节数
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public:
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VertexBufferObject(const GLuint index,
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const GLenum &buf_type,
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const GLenum &dsup,
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const uint &dt,const uint &dbytes,const uint &dcm,
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const GLsizeiptr &count)
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{
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buffer_index=index;
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buffer_type=buf_type;
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user_pattern=dsup;
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data_type=dt;
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data_bytes=dbytes;
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data_comp=dcm;
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data_count=count;
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total_bytes=data_bytes*data_comp*data_count;
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}
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virtual ~VertexBufferObject()=default;
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public:
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GLuint GetBuffer ()const {return buffer_index;} ///<取得OpenGL缓冲区
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GLenum GetBufferType ()const {return buffer_type;} ///<取得缓冲区类型
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GLenum GetUserPattern ()const {return user_pattern;} ///<取得缓冲区使用方法
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GLenum GetDataType ()const {return data_type;} ///<取得数据类型
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uint GetComponent ()const {return data_comp;} ///<取数每一组数据中的数据数量
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uint GetStride ()const {return data_comp*data_bytes;} ///<取得每一组数据字节数
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GLsizeiptr GetCount ()const {return data_count;} ///<取得数据数量
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GLsizeiptr GetTotalBytes ()const {return total_bytes;} ///<取得数据总字节数
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void * GetData () {return data;} ///<取得数据指针
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void * GetData (const uint pos) {return ((char *)data)+data_bytes*pos;} ///<取得数据指针
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public:
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virtual void Update()=0; ///<向缓冲区提交所有数据
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virtual void Change(const GLsizeiptr start,const GLsizeiptr size)=0; ///<向缓冲区提交部分数据
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virtual void Change(const GLsizeiptr start,const GLsizeiptr size,const void *)=0; ///<向缓冲区提交部分数据
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};//class VertexBufferObject
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/**
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* 创建一个VBO对象
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* @param buf_type 缓冲区类型(GL_ARRAY_BUFFER,GL_ELEMENT_ARRAY_BUFFER等)
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* @param dsup 数据存储区使用模式(GL_STATIC_DRAW,GL_DYNAMIC_DRAW等)
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* @param data_type 单个数据类型 (GL_BYTE,GL_UNSIGNED_SHORT,GL_FLOAT等)
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* @param data_bytes 单个数据字节数 (GL_BYTE为1,GL_UNSIGNED_SHORT为2GL_FLOAT为4等)
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* @param data_comp 数据成员数 (1/2/3/4，如2D纹理坐标用2，3D坐标/法线用3)
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* @param size 数据数量
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*/
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VertexBufferObject *CreateVBO( const GLenum &buf_type,
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const GLenum &dsup,
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const uint &data_type,const uint &data_bytes,const uint &data_comp,
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const GLsizeiptr &size);
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}//namespace graph
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}//namespace hgl
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#endif//HGL_GRAPH_VERTEX_BUFFER_OBJECT_INCLUDE
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