// Copyright (C) 2009-2010 Amundis
// Heavily based on the OpenGL driver implemented by Nikolaus Gebhardt
// and OpenGL ES driver implemented by Christian Stehno
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in Irrlicht.h
#ifndef __C_OGLES2_TEXTURE_H_INCLUDED__
#define __C_OGLES2_TEXTURE_H_INCLUDED__

#include "ITexture.h"
#include "IImage.h"

#include "IrrCompileConfig.h"
#ifdef _IRR_COMPILE_WITH_OGLES2_

namespace irr
{
namespace video
{

	class COGLES2Driver;

	//! OGLES2 texture.
	class COGLES2Texture : public ITexture
	{
	public:

		//! constructor
		COGLES2Texture( IImage* surface, const io::path& name, COGLES2Driver* driver = 0 );

		//! destructor
		virtual ~COGLES2Texture();

		//! lock function
		virtual void* lock(E_TEXTURE_LOCK_MODE mode=ETLM_READ_WRITE, u32 mipmapLevel=0);

		//! unlock function
		virtual void unlock();

		//! Returns original size of the texture (image).
		virtual const core::dimension2d<u32>& getOriginalSize() const;

		//! Returns size of the texture.
		virtual const core::dimension2d<u32>& getSize() const;

		//! returns driver type of texture (=the driver, that created it)
		virtual E_DRIVER_TYPE getDriverType() const;

		//! returns color format of texture
		virtual ECOLOR_FORMAT getColorFormat() const;

		//! returns pitch of texture (in bytes)
		virtual u32 getPitch() const;

		//! return open gl texture name
		u32 getOGLES2TextureName() const;

		//! return whether this texture has mipmaps
		virtual bool hasMipMaps() const;

		//! Regenerates the mip map levels of the texture.
		virtual void regenerateMipMapLevels(void* mipmapData=0);

		//! Is it a render target?
		virtual bool isRenderTarget() const;

		//! Is it a FrameBufferObject?
		virtual bool isFrameBufferObject() const;

		//! Bind RenderTargetTexture
		void bindRTT();

		//! Unbind RenderTargetTexture
		void unbindRTT();

		//! sets whether this texture is intended to be used as a render target.
		void setIsRenderTarget( bool isTarget );

	protected:

		//! protected constructor with basic setup, no GL texture name created, for derived classes
		COGLES2Texture( const io::path& name, COGLES2Driver* driver );

		//! get the desired color format based on texture creation flags and the input format.
		ECOLOR_FORMAT getBestColorFormat( ECOLOR_FORMAT format );

		//! convert the image into an internal image with better properties for this driver.
		void getImageData( IImage* image );

		//! copies the the texture into an open gl texture.
		void copyTexture( bool newTexture = true );

		core::dimension2d<u32> ImageSize;
		COGLES2Driver* Driver;
		IImage* Image;

		u32 TextureName;
		s32 InternalFormat;
		u32 PixelFormat;
		u32 PixelType;

		bool HasMipMaps;
		bool IsRenderTarget;
		bool AutomaticMipmapUpdate;
		bool UseStencil;
		bool ReadOnlyLock;
	};


	//! OGLES2 FBO texture.
	class COGLES2FBOTexture : public COGLES2Texture
	{
	public:

		//! FrameBufferObject constructor
		COGLES2FBOTexture( const core::dimension2d<u32>& size, const io::path& name, COGLES2Driver* driver = 0, ECOLOR_FORMAT format = ECF_UNKNOWN );

		//! destructor
		virtual ~COGLES2FBOTexture();

		//! Is it a FrameBufferObject?
		virtual bool isFrameBufferObject() const;

		//! Bind RenderTargetTexture
		virtual void bindRTT();

		//! Unbind RenderTargetTexture
		virtual void unbindRTT();

		ITexture* DepthTexture;
	protected:
		u32 ColorFrameBuffer;
	};


	//! OGLES2 FBO depth texture.
	class COGLES2FBODepthTexture : public COGLES2FBOTexture
	{
	public:
		//! FrameBufferObject depth constructor
		COGLES2FBODepthTexture( const core::dimension2d<u32>& size, const io::path& name, COGLES2Driver* driver = 0, bool useStencil = false );

		//! destructor
		virtual ~COGLES2FBODepthTexture();

		//! Bind RenderTargetTexture
		virtual void bindRTT();

		//! Unbind RenderTargetTexture
		virtual void unbindRTT();

		void attach( ITexture* );

	protected:
		u32 DepthRenderBuffer;
		u32 StencilRenderBuffer;
		bool UseStencil;
	};


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

#endif
#endif // _IRR_COMPILE_WITH_OGLES2_