//========= Copyright © 1996-2005, Valve Corporation, All rights reserved. ============//
//
// Purpose: 
//
// $NoKeywords: $
//
//=============================================================================//

#ifndef ITEXTURE_H
#define ITEXTURE_H

#ifdef _WIN32
#pragma once
#endif

enum ImageFormat;
class IVTFTexture;
class ITexture;
struct Rect_t;

//-----------------------------------------------------------------------------
// This will get called on procedural textures to re-fill the textures
// with the appropriate bit pattern. Calling Download() will also
// cause this interface to be called. It will also be called upon
// mode switch, or on other occasions where the bits are discarded.
//-----------------------------------------------------------------------------
class ITextureRegenerator
{
public:
	// This will be called when the texture bits need to be regenerated.
	// Use the VTFTexture interface, which has been set up with the
	// appropriate texture size + format
	// The rect specifies which part of the texture needs to be updated
	// You can choose to update all of the bits if you prefer
	virtual void RegenerateTextureBits( ITexture *pTexture, IVTFTexture *pVTFTexture, Rect_t *pRect ) = 0;

	// This will be called when the regenerator needs to be deleted
	// which will happen when the texture is destroyed
	virtual void Release() = 0;
};

class ITexture
{
public:
	// Various texture polling methods
	virtual const char *GetName( void ) const = 0;
	virtual int GetMappingWidth() const = 0;
	virtual int GetMappingHeight() const = 0;
	virtual int GetActualWidth() const = 0;
	virtual int GetActualHeight() const = 0;
	virtual int GetNumAnimationFrames() const = 0;
	virtual bool IsTranslucent() const = 0;
	virtual bool IsMipmapped() const = 0;

	virtual void GetLowResColorSample( float s, float t, float *color ) const = 0;

	// Methods associated with reference count
	virtual void IncrementReferenceCount( void ) = 0;
	virtual void DecrementReferenceCount( void ) = 0;

	// Used to modify the texture bits (procedural textures only)
	virtual void SetTextureRegenerator( ITextureRegenerator *pTextureRegen ) = 0;

	// Reconstruct the texture bits in HW memory

	// If rect is not specified, reconstruct all bits, otherwise just
	// reconstruct a subrect.
	virtual void Download( Rect_t *pRect = 0 ) = 0;

	// Uses for stats. . .get the approximate size of the texture in it's current format.
	virtual int GetApproximateVidMemBytes( void ) const = 0;

	// Returns true if the texture data couldn't be loaded.
	virtual bool IsError() const = 0;
};


inline bool IsErrorTexture( ITexture *pTex )
{
	return !pTex || pTex->IsError();
}


#endif // ITEXTURE_H
