128 lines
4.7 KiB
C++
128 lines
4.7 KiB
C++
#ifndef HGL_GRAPH_BUFFER_OBJECT_INCLUDE
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#define HGL_GRAPH_BUFFER_OBJECT_INCLUDE
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#include<hgl/graph/BufferData.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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protected:
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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 buffer_bytes;
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const BufferData *buffer_data;
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protected:
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friend BufferObject *CreateBuffer(GLenum type,GLenum user_pattern,BufferData *buf);
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BufferObject(GLuint index,GLenum type)
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{
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buffer_index=index;
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buffer_type =type;
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user_pattern=0;
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buffer_bytes=0;
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buffer_data=nullptr;
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}
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public:
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virtual ~BufferObject();
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public:
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GLuint GetBufferIndex ()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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const BufferData *GetBufferData ()const {return buffer_data;} ///<取得缓冲数区(这里返回const是为了不想让只有BufferObject的模块可以修改数据)
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public:
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virtual bool Submit (const void *,GLsizeiptr,GLenum user_pattern)=0; ///<提交数据
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bool Submit (const BufferData *buf_data,GLenum user_pattern) ///<提交数据
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{
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if(!buf_data)return(false);
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buffer_data=buf_data;
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const void * data=buf_data->GetData();
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const GLsizeiptr size=buf_data->GetTotalBytes();
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if(!data||size<=0)return(false);
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return Submit(data,size,user_pattern);
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}
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virtual bool Change (const void *,GLsizeiptr,GLsizeiptr)=0; ///<修改数据
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};//class BufferObject
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/**
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* 创建一个缓冲区
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* @param type 缓冲区类型(GL_ARRAY_BUFFER,GL_ELEMENT_ARRAY_BUFFER等)
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* @param user_pattern 缓冲区数据用法(GL_STATIC_DRAW,GL_DYNAMIC_DRAW等)
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* @param buf 数据缓冲区
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*/
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BufferObject *CreateBuffer(GLenum type,GLenum user_pattern=0,BufferData *buf=nullptr);
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/**
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* 创建一个数据对象
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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 user_pattern 数据存储区使用模式(GL_STATIC_DRAW,GL_DYNAMIC_DRAW等)
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* @param total_bytes 数据总字节数
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*/
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inline BufferObject *CreateBuffer( const GLenum &buf_type,
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const GLenum &user_pattern,
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const GLsizeiptr &total_bytes)
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{
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if(total_bytes<=0)return(nullptr);
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BufferObject *buf=CreateBuffer(buf_type);
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if(!buf)
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return(nullptr);
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if(buf->Create(data,total_bytes))
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return buf;
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delete buf;
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return(nullptr);
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}
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/**
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* 创建一个数据对象
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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 user_pattern 数据存储区使用模式(GL_STATIC_DRAW,GL_DYNAMIC_DRAW等)
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* @param total_bytes 数据总字节数
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* @param data 数据指针
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*/
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inline BufferObject *CreateBuffer( const GLenum &buf_type,
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const GLenum &user_pattern,
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const GLsizeiptr &total_bytes,void *data)
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{
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if(total_bytes<=0)return(nullptr);
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if(!data)return(nullptr);
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BufferObject *buf=CreateBuffer(buf_type);
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if(!buf)
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return(nullptr);
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if(buf->Submit(data,total_bytes,user_pattern))
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return buf;
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delete buf;
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return(nullptr);
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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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