itexture.h #1

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

#ifndef ITEXTURE_H
#define ITEXTURE_H

#ifdef _WIN32
#pragma once
#endif

#include "tier0/platform.h"
#include "bitmap/imageformat.h" // ImageFormat defn.

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.
//-----------------------------------------------------------------------------
abstract_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;
};

abstract_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;

	// NOTE: Stuff after this is added after shipping HL2.

	// For volume textures
	virtual bool IsVolumeTexture() const = 0;
	virtual int GetMappingDepth() const = 0;
	virtual int GetActualDepth() const = 0;

	virtual ImageFormat GetImageFormat() const = 0;

	// Various information about the texture
	virtual bool IsRenderTarget() const = 0;
	virtual bool IsCubeMap() const = 0;
	virtual bool IsNormalMap() const = 0;
	virtual bool IsProcedural() const = 0;
#ifdef _XBOX
	virtual int GetTextureFlags() const = 0;
	virtual bool ForceIntoCache( bool bSyncWait ) = 0;
#endif

	virtual void DeleteIfUnreferenced() = 0;
};


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


#endif // ITEXTURE_H