47bb382830
this is a huge refactor and cleanup of the gl shader building system in Skia. The entire shader building pipeline is now part of GrGLProgramCreator, which takes a gp, and some fps, and creates a program. I added some subclasses of GrGLProgram to handle the eccentricities of Nvpr/Nvpres. Outside of the builders folder and GrGLPrograms, this change is basically just a rename solo gp BUG=skia: Committed: https://skia.googlesource.com/skia/+/fe1233c3f12f81bb675718516bbb32f72af726ec Review URL: https://codereview.chromium.org/611653002
250 lines
8.4 KiB
C++
250 lines
8.4 KiB
C++
|
|
/*
|
|
* Copyright 2011 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
|
|
#ifndef GrPaint_DEFINED
|
|
#define GrPaint_DEFINED
|
|
|
|
#include "GrColor.h"
|
|
#include "GrProcessorStage.h"
|
|
|
|
#include "SkXfermode.h"
|
|
|
|
/**
|
|
* The paint describes how color and coverage are computed at each pixel by GrContext draw
|
|
* functions and the how color is blended with the destination pixel.
|
|
*
|
|
* The paint allows installation of custom color and coverage stages. New types of stages are
|
|
* created by subclassing GrProcessor.
|
|
*
|
|
* The primitive color computation starts with the color specified by setColor(). This color is the
|
|
* input to the first color stage. Each color stage feeds its output to the next color stage. The
|
|
* final color stage's output color is input to the color filter specified by
|
|
* setXfermodeColorFilter which produces the final source color, S.
|
|
*
|
|
* Fractional pixel coverage follows a similar flow. The coverage is initially the value specified
|
|
* by setCoverage(). This is input to the first coverage stage. Coverage stages are chained
|
|
* together in the same manner as color stages. The output of the last stage is modulated by any
|
|
* fractional coverage produced by anti-aliasing. This last step produces the final coverage, C.
|
|
*
|
|
* setBlendFunc() specifies blending coefficients for S (described above) and D, the initial value
|
|
* of the destination pixel, labeled Bs and Bd respectively. The final value of the destination
|
|
* pixel is then D' = (1-C)*D + C*(Bd*D + Bs*S).
|
|
*
|
|
* Note that the coverage is applied after the blend. This is why they are computed as distinct
|
|
* values.
|
|
*
|
|
* TODO: Encapsulate setXfermodeColorFilter in a GrProcessor and remove from GrPaint.
|
|
*/
|
|
class GrPaint {
|
|
public:
|
|
GrPaint() { this->reset(); }
|
|
|
|
GrPaint(const GrPaint& paint) { *this = paint; }
|
|
|
|
~GrPaint() {}
|
|
|
|
/**
|
|
* Sets the blending coefficients to use to blend the final primitive color with the
|
|
* destination color. Defaults to kOne for src and kZero for dst (i.e. src mode).
|
|
*/
|
|
void setBlendFunc(GrBlendCoeff srcCoeff, GrBlendCoeff dstCoeff) {
|
|
fSrcBlendCoeff = srcCoeff;
|
|
fDstBlendCoeff = dstCoeff;
|
|
}
|
|
GrBlendCoeff getSrcBlendCoeff() const { return fSrcBlendCoeff; }
|
|
GrBlendCoeff getDstBlendCoeff() const { return fDstBlendCoeff; }
|
|
|
|
/**
|
|
* The initial color of the drawn primitive. Defaults to solid white.
|
|
*/
|
|
void setColor(GrColor color) { fColor = color; }
|
|
GrColor getColor() const { return fColor; }
|
|
|
|
/**
|
|
* Applies fractional coverage to the entire drawn primitive. Defaults to 0xff.
|
|
*/
|
|
void setCoverage(uint8_t coverage) { fCoverage = coverage; }
|
|
uint8_t getCoverage() const { return fCoverage; }
|
|
|
|
/**
|
|
* Should primitives be anti-aliased or not. Defaults to false.
|
|
*/
|
|
void setAntiAlias(bool aa) { fAntiAlias = aa; }
|
|
bool isAntiAlias() const { return fAntiAlias; }
|
|
|
|
/**
|
|
* Should dithering be applied. Defaults to false.
|
|
*/
|
|
void setDither(bool dither) { fDither = dither; }
|
|
bool isDither() const { return fDither; }
|
|
|
|
/**
|
|
* Appends an additional color processor to the color computation.
|
|
*/
|
|
const GrFragmentProcessor* addColorProcessor(const GrFragmentProcessor* fp) {
|
|
SkASSERT(fp);
|
|
if (!fp->willUseInputColor()) {
|
|
fColorStages.reset();
|
|
}
|
|
SkNEW_APPEND_TO_TARRAY(&fColorStages, GrFragmentStage, (fp));
|
|
return fp;
|
|
}
|
|
|
|
/**
|
|
* Appends an additional coverage processor to the coverage computation.
|
|
*/
|
|
const GrFragmentProcessor* addCoverageProcessor(const GrFragmentProcessor* fp) {
|
|
SkASSERT(fp);
|
|
if (!fp->willUseInputColor()) {
|
|
fCoverageStages.reset();
|
|
}
|
|
SkNEW_APPEND_TO_TARRAY(&fCoverageStages, GrFragmentStage, (fp));
|
|
return fp;
|
|
}
|
|
|
|
/**
|
|
* Helpers for adding color or coverage effects that sample a texture. The matrix is applied
|
|
* to the src space position to compute texture coordinates.
|
|
*/
|
|
void addColorTextureProcessor(GrTexture*, const SkMatrix&);
|
|
void addCoverageTextureProcessor(GrTexture*, const SkMatrix&);
|
|
void addColorTextureProcessor(GrTexture*, const SkMatrix&, const GrTextureParams&);
|
|
void addCoverageTextureProcessor(GrTexture*, const SkMatrix&, const GrTextureParams&);
|
|
|
|
int numColorStages() const { return fColorStages.count(); }
|
|
int numCoverageStages() const { return fCoverageStages.count(); }
|
|
int numTotalStages() const { return this->numColorStages() + this->numCoverageStages(); }
|
|
|
|
const GrFragmentStage& getColorStage(int s) const { return fColorStages[s]; }
|
|
const GrFragmentStage& getCoverageStage(int s) const { return fCoverageStages[s]; }
|
|
|
|
GrPaint& operator=(const GrPaint& paint) {
|
|
fSrcBlendCoeff = paint.fSrcBlendCoeff;
|
|
fDstBlendCoeff = paint.fDstBlendCoeff;
|
|
fAntiAlias = paint.fAntiAlias;
|
|
fDither = paint.fDither;
|
|
|
|
fColor = paint.fColor;
|
|
fCoverage = paint.fCoverage;
|
|
|
|
fColorStages = paint.fColorStages;
|
|
fCoverageStages = paint.fCoverageStages;
|
|
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* Resets the paint to the defaults.
|
|
*/
|
|
void reset() {
|
|
this->resetBlend();
|
|
this->resetOptions();
|
|
this->resetColor();
|
|
this->resetCoverage();
|
|
this->resetStages();
|
|
}
|
|
|
|
/**
|
|
* Determines whether the drawing with this paint is opaque with respect to both color blending
|
|
* and fractional coverage. It does not consider whether AA has been enabled on the paint or
|
|
* not. Depending upon whether multisampling or coverage-based AA is in use, AA may make the
|
|
* result only apply to the interior of primitives.
|
|
*
|
|
*/
|
|
bool isOpaque() const;
|
|
|
|
/**
|
|
* Returns true if isOpaque would return true and the paint represents a solid constant color
|
|
* draw. If the result is true, constantColor will be updated to contain the constant color.
|
|
*/
|
|
bool isOpaqueAndConstantColor(GrColor* constantColor) const;
|
|
|
|
private:
|
|
|
|
/**
|
|
* Helper for isOpaque and isOpaqueAndConstantColor.
|
|
*/
|
|
bool getOpaqueAndKnownColor(GrColor* solidColor, uint32_t* solidColorKnownComponents) const;
|
|
|
|
/**
|
|
* Called when the source coord system from which geometry is rendered changes. It ensures that
|
|
* the local coordinates seen by effects remains unchanged. oldToNew gives the transformation
|
|
* from the previous coord system to the new coord system.
|
|
*/
|
|
void localCoordChange(const SkMatrix& oldToNew) {
|
|
for (int i = 0; i < fColorStages.count(); ++i) {
|
|
fColorStages[i].localCoordChange(oldToNew);
|
|
}
|
|
for (int i = 0; i < fCoverageStages.count(); ++i) {
|
|
fCoverageStages[i].localCoordChange(oldToNew);
|
|
}
|
|
}
|
|
|
|
bool localCoordChangeInverse(const SkMatrix& newToOld) {
|
|
SkMatrix oldToNew;
|
|
bool computed = false;
|
|
for (int i = 0; i < fColorStages.count(); ++i) {
|
|
if (!computed && !newToOld.invert(&oldToNew)) {
|
|
return false;
|
|
} else {
|
|
computed = true;
|
|
}
|
|
fColorStages[i].localCoordChange(oldToNew);
|
|
}
|
|
for (int i = 0; i < fCoverageStages.count(); ++i) {
|
|
if (!computed && !newToOld.invert(&oldToNew)) {
|
|
return false;
|
|
} else {
|
|
computed = true;
|
|
}
|
|
fCoverageStages[i].localCoordChange(oldToNew);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
friend class GrContext; // To access above two functions
|
|
friend class GrStencilAndCoverTextContext; // To access above two functions
|
|
|
|
SkSTArray<4, GrFragmentStage> fColorStages;
|
|
SkSTArray<2, GrFragmentStage> fCoverageStages;
|
|
|
|
GrBlendCoeff fSrcBlendCoeff;
|
|
GrBlendCoeff fDstBlendCoeff;
|
|
bool fAntiAlias;
|
|
bool fDither;
|
|
|
|
GrColor fColor;
|
|
uint8_t fCoverage;
|
|
|
|
void resetBlend() {
|
|
fSrcBlendCoeff = kOne_GrBlendCoeff;
|
|
fDstBlendCoeff = kZero_GrBlendCoeff;
|
|
}
|
|
|
|
void resetOptions() {
|
|
fAntiAlias = false;
|
|
fDither = false;
|
|
}
|
|
|
|
void resetColor() {
|
|
fColor = GrColorPackRGBA(0xff, 0xff, 0xff, 0xff);
|
|
}
|
|
|
|
void resetCoverage() {
|
|
fCoverage = 0xff;
|
|
}
|
|
|
|
void resetStages() {
|
|
fColorStages.reset();
|
|
fCoverageStages.reset();
|
|
}
|
|
};
|
|
|
|
#endif
|