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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrSamplerState_DEFINED
#define GrSamplerState_DEFINED
#include "GrCustomStage.h"
#include "GrMatrix.h"
#include "GrTypes.h"
class GrSamplerState {
public:
enum Filter {
/**
* Read the closest src texel to the sample position
*/
kNearest_Filter,
/**
* Blend between closest 4 src texels to sample position (tent filter)
*/
kBilinear_Filter,
kDefault_Filter = kNearest_Filter
};
/**
* Describes how a texture is sampled when coordinates are outside the
* texture border
*/
enum WrapMode {
kClamp_WrapMode,
kRepeat_WrapMode,
kMirror_WrapMode,
kDefault_WrapMode = kClamp_WrapMode
};
/**
* Default sampler state is set to clamp, use normal sampling mode, be
* unfiltered, and use identity matrix.
*/
GrSamplerState()
: fCustomStage (NULL) {
memset(this, 0, sizeof(GrSamplerState));
this->reset();
}
~GrSamplerState() {
GrSafeUnref(fCustomStage);
}
bool operator ==(const GrSamplerState& s) const {
/* We must be bit-identical as far as the CustomStage;
there may be multiple CustomStages that will produce
the same shader code and so are equivalent.
Can't take the address of fWrapX because it's :8 */
int bitwiseRegion = (intptr_t) &fCustomStage - (intptr_t) this;
GrAssert(sizeof(GrSamplerState) ==
bitwiseRegion + sizeof(fCustomStage));
return !memcmp(this, &s, bitwiseRegion) &&
((fCustomStage == s.fCustomStage) ||
(fCustomStage && s.fCustomStage &&
(fCustomStage->getFactory() ==
s.fCustomStage->getFactory()) &&
fCustomStage->isEqual(*s.fCustomStage)));
}
bool operator !=(const GrSamplerState& s) const { return !(*this == s); }
GrSamplerState& operator =(const GrSamplerState& s) {
// memcpy() breaks refcounting
fWrapX = s.fWrapX;
fWrapY = s.fWrapY;
fFilter = s.fFilter;
fMatrix = s.fMatrix;
fSwapRAndB = s.fSwapRAndB;
fTextureDomain = s.fTextureDomain;
GrSafeAssign(fCustomStage, s.fCustomStage);
return *this;
}
WrapMode getWrapX() const { return fWrapX; }
WrapMode getWrapY() const { return fWrapY; }
const GrMatrix& getMatrix() const { return fMatrix; }
const GrRect& getTextureDomain() const { return fTextureDomain; }
bool hasTextureDomain() const {return SkIntToScalar(0) != fTextureDomain.right();}
Filter getFilter() const { return fFilter; }
bool swapsRAndB() const { return fSwapRAndB; }
void setWrapX(WrapMode mode) { fWrapX = mode; }
void setWrapY(WrapMode mode) { fWrapY = mode; }
/**
* Access the sampler's matrix. See SampleMode for explanation of
* relationship between the matrix and sample mode.
*/
GrMatrix* matrix() { return &fMatrix; }
/**
* Sets the sampler's texture coordinate domain to a
* custom rectangle, rather than the default (0,1).
* This option is currently only supported with kClamp_WrapMode
*/
void setTextureDomain(const GrRect& textureDomain) { fTextureDomain = textureDomain; }
/**
* Swaps the R and B components when reading from the texture. Has no effect
* if the texture is alpha only.
*/
void setRAndBSwap(bool swap) { fSwapRAndB = swap; }
/**
* Multiplies the current sampler matrix a matrix
*
* After this call M' = M*m where M is the old matrix, m is the parameter
* to this function, and M' is the new matrix. (We consider points to
* be column vectors so tex cood vector t is transformed by matrix X as
* t' = X*t.)
*
* @param matrix the matrix used to modify the matrix.
*/
void preConcatMatrix(const GrMatrix& matrix) { fMatrix.preConcat(matrix); }
/**
* Sets filtering type.
* @param filter type of filtering to apply
*/
void setFilter(Filter filter) { fFilter = filter; }
void reset(WrapMode wrapXAndY,
Filter filter,
const GrMatrix& matrix) {
fWrapX = wrapXAndY;
fWrapY = wrapXAndY;
fFilter = filter;
fMatrix = matrix;
fTextureDomain.setEmpty();
fSwapRAndB = false;
GrSafeSetNull(fCustomStage);
}
void reset(WrapMode wrapXAndY, Filter filter) {
this->reset(wrapXAndY, filter, GrMatrix::I());
}
void reset(const GrMatrix& matrix) {
this->reset(kDefault_WrapMode, kDefault_Filter, matrix);
}
void reset() {
this->reset(kDefault_WrapMode, kDefault_Filter, GrMatrix::I());
}
GrCustomStage* setCustomStage(GrCustomStage* stage) {
GrSafeAssign(fCustomStage, stage);
return stage;
}
GrCustomStage* getCustomStage() const { return fCustomStage; }
private:
WrapMode fWrapX : 8;
WrapMode fWrapY : 8;
Filter fFilter : 8;
bool fSwapRAndB;
GrMatrix fMatrix;
GrRect fTextureDomain;
GrCustomStage* fCustomStage;
};
#endif
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