// Copyright (C) 2002-2007 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#ifndef __C_OPENGL_SHADER_MATERIAL_RENDERER_H_INCLUDED__
#define __C_OPENGL_SHADER_MATERIAL_RENDERER_H_INCLUDED__

#include "IrrCompileConfig.h"
#ifdef _IRR_COMPILE_WITH_OPENGL_

#ifdef _IRR_WINDOWS_API_
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <GL/gl.h>
#elif defined(MACOSX)
#include <OpenGL/gl.h>
#include <OpenGL/glext.h>
#else
#if defined(_IRR_OPENGL_USE_EXTPOINTER_)
#define GL_GLEXT_LEGACY 1
#endif
#include <GL/gl.h>
#if defined(_IRR_OPENGL_USE_EXTPOINTER_)
#include "glext.h"
#endif
#endif

#include "IMaterialRenderer.h"

namespace irr
{
namespace video
{

class COpenGLDriver;
class IShaderConstantSetCallBack;
class IMaterialRenderer;

//! Class for using vertex and pixel shaders with OpenGL
class COpenGLShaderMaterialRenderer : public IMaterialRenderer
{
public:

	//! Constructor
	COpenGLShaderMaterialRenderer(video::COpenGLDriver* driver,
		s32& outMaterialTypeNr, const c8* vertexShaderProgram, const c8* pixelShaderProgram,
		IShaderConstantSetCallBack* callback, IMaterialRenderer* baseMaterial, s32 userData);

	//! Destructor
	~COpenGLShaderMaterialRenderer();

	virtual void OnSetMaterial(video::SMaterial& material, const video::SMaterial& lastMaterial,
		bool resetAllRenderstates, video::IMaterialRendererServices* services);

	virtual bool OnRender(IMaterialRendererServices* service, E_VERTEX_TYPE vtxtype);

	virtual void OnUnsetMaterial();

	//! Returns if the material is transparent.
	virtual bool isTransparent();

protected:

	//! constructor only for use by derived classes who want to
	//! create a fall back material for example.
	COpenGLShaderMaterialRenderer(COpenGLDriver* driver,
					IShaderConstantSetCallBack* callback,
					IMaterialRenderer* baseMaterial, s32 userData=0);

	void init(s32& outMaterialTypeNr, const c8* vertexShaderProgram,
		const c8* pixelShaderProgram, E_VERTEX_TYPE type);

	bool createPixelShader(const c8* pxsh);
	bool createVertexShader(const char* vtxsh);

	video::COpenGLDriver* Driver;
	IShaderConstantSetCallBack* CallBack;
	IMaterialRenderer* BaseMaterial;

	GLuint VertexShader;
	GLuint PixelShader;
	s32 UserData;
};


} // end namespace video
} // end namespace irr

#endif
#endif

