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Include/ZRenderer/ZOpenGLDataBuffer.hpp

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+/*
+	ZOpenGLDataBuffer.hpp
+	Author: James Russell <jcrussell@762studios.com>
+	Created: 3/20/2011
+
+	Purpose: 
+	
+	OpenGL implementation of the ZDataBuffer interfaces.
+
+	License:
+
+	TODO
+*/
+
+#pragma once
+
+#ifndef _ZOPENGLDATABUFFER_HPP
+#define _ZOPENGLDATABUFFER_HPP
+
+#include <ZUtil/ZUtil.hpp>
+
+#include <ZRenderer/ZDataBufferBase.hpp>
+
+//Forward Declarations
+class ZOpenGLRenderer;
+
+/*
+OpenGL Data Buffer.
+*/
+class ZOpenGLDataBuffer : public ZDataBufferBase
+{
+protected:
+	//Renderer associated with this buffer
+	ZOpenGLRenderer *Renderer;
+
+	//The current offset to use
+	size_t NextOffset;
+
+	//Offset Alignment Requirement
+	static int OffsetAlignment;
+
+	//Gets the buffer data from the graphics device as part of a thread request
+	static void GetDeviceData_( ZThread *_renderThread, void *_dataBuffer );
+
+	//Subclass Override
+	virtual void GetDeviceData(void* _buffer);
+
+	//Subclass Override
+	virtual size_t GetNextBlockOffset(size_t _size);
+
+	//Subclass Override
+	virtual void ResetBlockOffset();
+
+public:
+	//OpenGL Handle to the Buffer
+	GLuint GLHandle;
+
+	//Gets a GLenum based off of type
+	GLenum GetGLType()
+	{
+		switch (Type)
+		{
+		case ZDBT_UNIFORM:	return GL_UNIFORM_BUFFER;
+		case ZDBT_VERTEX:	return GL_ARRAY_BUFFER;
+		case ZDBT_INDEX:	return GL_ELEMENT_ARRAY_BUFFER;
+		default:			return GL_INVALID_ENUM;
+		}
+	}
+
+	//Gets a GLenum based off of usage
+	GLenum GetGLUsage()
+	{
+		switch(Usage)
+		{
+		case ZDBU_STATIC:		return GL_STATIC_DRAW;
+		case ZDBU_DYNAMIC:		return GL_DYNAMIC_DRAW;
+		case ZDBU_STREAMING:	return GL_STREAM_DRAW;	
+		default:				return GL_INVALID_ENUM;	
+		}
+	}
+
+	/*
+	Constructor.
+
+	@param _renderer - the current renderer
+	@param _type - the type of buffer this is
+	@param _usage - the usage type of this buffer
+	@param _size - the size (in bytes) of the data buffer
+	*/
+	ZOpenGLDataBuffer(ZOpenGLRenderer *_renderer, ZDataBufferType _type, ZDataBufferUsage _usage, size_t _size);
+
+	/*
+	Destructor.
+	*/
+	virtual ~ZOpenGLDataBuffer();
+};
+
+#endif