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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrSingleTextureEffect_DEFINED
#define GrSingleTextureEffect_DEFINED
#include "GrProcessor.h"
#include "SkMatrix.h"
#include "GrCoordTransform.h"
class GrTexture;
/**
* A base class for effects that draw a single texture with a texture matrix. This effect has no
* backend implementations. One must be provided by the subclass.
*/
class GrSingleTextureEffect : public GrFragmentProcessor {
public:
virtual ~GrSingleTextureEffect();
protected:
/** unfiltered, clamp mode */
GrSingleTextureEffect(GrTexture*, const SkMatrix&, GrCoordSet = kLocal_GrCoordSet);
/** clamp mode */
GrSingleTextureEffect(GrTexture*, const SkMatrix&, GrTextureParams::FilterMode filterMode,
GrCoordSet = kLocal_GrCoordSet);
GrSingleTextureEffect(GrTexture*,
const SkMatrix&,
const GrTextureParams&,
GrCoordSet = kLocal_GrCoordSet);
/**
* Helper for subclass onIsEqual() functions.
*/
bool hasSameTextureParamsMatrixAndSourceCoords(const GrSingleTextureEffect& other) const {
// We don't have to check the accesses' swizzles because they are inferred from the texture.
return fTextureAccess == other.fTextureAccess &&
fCoordTransform.getMatrix().cheapEqualTo(other.fCoordTransform.getMatrix()) &&
fCoordTransform.sourceCoords() == other.fCoordTransform.sourceCoords();
}
/**
* Can be used as a helper to implement subclass onComputeInvariantOutput(). It assumes that
* the subclass output color will be a modulation of the input color with a value read from the
* texture.
*/
void updateInvariantOutputForModulation(InvariantOutput* inout) const {
if (GrPixelConfigIsOpaque(this->texture(0)->config())) {
inout->mulByUnknownOpaqueColor();
} else {
inout->mulByUnknownColor();
}
}
private:
GrCoordTransform fCoordTransform;
GrTextureAccess fTextureAccess;
typedef GrFragmentProcessor INHERITED;
};
#endif
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