72 lines
3.1 KiB
C++
72 lines
3.1 KiB
C++
#ifndef HGL_GRAPH_BUFFER_OBJECT_INCLUDE
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#define HGL_GRAPH_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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* 显存数据缓冲区对象<br>
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* 负责对象与API的交接
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*/
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class BufferObject
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{
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GLuint buffer_index; ///<缓冲区索引
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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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GLsizeiptr total_bytes; ///<数据总字节数
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void *local_data,*local_data_end; ///<本地数据内存指针
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bool self_alloc; ///<是否自身分配
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protected:
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BufferObject(GLuint index,GLenum type,GLenum up)
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{
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buffer_index=index;
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buffer_type=type;
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user_pattern=up;
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}
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BufferObject(GLuint index,GLenum type,GLenum up,void *data,GLsizeiptr size,bool data_self_alloc)
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{
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buffer_index=index;
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buffer_type=type;
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user_pattern=up;
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total_bytes=size;
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local_data=data;
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local_data_end=((char *)data)+size;
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self_alloc=data_self_alloc;
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}
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virtual ~BufferObject()
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{
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if(self_alloc)
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if(local_data)delete[] local_data;
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}
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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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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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};//class BufferObject
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BufferObject *CreateBuffer(GLenum type)
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{
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隐藏BufferObject创建方法，并且必须在外部创建好buffer index再创建buffer object。
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并将buffer object本身与内存镜像数据部分分离，这样保证buffer object的单纯性，
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其它无需操作数据的模块，也没有可直接操作数据的API可用。
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}
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}//namespace graph
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}//namespace hgl
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#endif//HGL_GRAPH_BUFFER_OBJECT_INCLUDE
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