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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGLPathRendering_DEFINED
#define GrGLPathRendering_DEFINED
#include "SkRefCnt.h"
#include "GrPathRendering.h"
#include "GrStencil.h"
#include "gl/GrGLFunctions.h"
#include "gl/GrGLProgram.h"
class GrGLNameAllocator;
class GrGLGpu;
/**
* This class wraps the NV_path_rendering extension and manages its various
* API versions. If a method is not present in the GrGLInterface of the GrGLGpu
* (because the driver version is old), it tries to provide a backup
* implementation. But if a backup implementation is not practical, it marks the
* method as not supported.
*/
class GrGLPathRendering : public GrPathRendering {
public:
/**
* Create a new GrGLPathRendering object from a given GrGLGpu.
*/
GrGLPathRendering(GrGLGpu* gpu);
virtual ~GrGLPathRendering();
// GrPathRendering implementations.
GrPath* createPath(const SkPath&, const SkStrokeRec&) override;
virtual GrPathRange* createPathRange(GrPathRange::PathGenerator*,
const SkStrokeRec&) override;
virtual GrPathRange* createGlyphs(const SkTypeface*,
const SkDescriptor*,
const SkStrokeRec&) override;
void stencilPath(const GrPath*, const GrStencilSettings&) override;
void drawPath(const GrPath*, const GrStencilSettings&) override;
virtual void drawPaths(const GrPathRange*, const void* indices, PathIndexType,
const float transformValues[], PathTransformType, int count,
const GrStencilSettings&) override;
/* Called when the 3D context state is unknown. */
void resetContext();
/**
* Called when the GPU resources have been lost and need to be abandoned
* (for example after a context loss).
*/
void abandonGpuResources();
enum TexturingMode {
FixedFunction_TexturingMode,
SeparableShaders_TexturingMode
};
/** Specifies whether texturing should use fixed fuction pipe or separable shaders
* Specifies whether texturing should use fixed fuction pipe or whether
* it is ok to use normal vertex and fragment shaders, and for path rendering
* populate fragment shaders with setProgramPathFragmentInputTransform.
* The fixed function mode will be removed once the other mode is more widely
* available.
*/
TexturingMode texturingMode() const {
return caps().fragmentInputGenSupport ?
SeparableShaders_TexturingMode : FixedFunction_TexturingMode;
}
// Functions for fixed function texturing support.
enum PathTexGenComponents {
kS_PathTexGenComponents = 1,
kST_PathTexGenComponents = 2,
kSTR_PathTexGenComponents = 3
};
void enablePathTexGen(int unitIdx, PathTexGenComponents, const GrGLfloat* coefficients);
void enablePathTexGen(int unitIdx, PathTexGenComponents, const SkMatrix& matrix);
void flushPathTexGenSettings(int numUsedTexCoordSets);
// Functions for "separable shader" texturing support.
void setProgramPathFragmentInputTransform(GrGLuint program, GrGLint location,
GrGLenum genMode, GrGLint components,
const SkMatrix&);
/* Sets the projection matrix for path rendering */
void setProjectionMatrix(const SkMatrix& matrix,
const SkISize& renderTargetSize,
GrSurfaceOrigin renderTargetOrigin);
GrGLuint genPaths(GrGLsizei range);
GrGLvoid deletePaths(GrGLuint path, GrGLsizei range);
private:
/**
* Mark certain functionality as not supported if the driver version is too
* old and a backup implementation is not practical.
*/
struct Caps {
bool stencilThenCoverSupport : 1;
bool fragmentInputGenSupport : 1;
bool glyphLoadingSupport : 1;
};
const Caps& caps() const { return fCaps; }
void flushPathStencilSettings(const GrStencilSettings&);
// NV_path_rendering v1.2
void stencilThenCoverFillPath(GrGLuint path, GrGLenum fillMode,
GrGLuint mask, GrGLenum coverMode);
void stencilThenCoverStrokePath(GrGLuint path, GrGLint reference,
GrGLuint mask, GrGLenum coverMode);
void stencilThenCoverFillPathInstanced(
GrGLsizei numPaths, GrGLenum pathNameType, const GrGLvoid *paths,
GrGLuint pathBase, GrGLenum fillMode, GrGLuint mask, GrGLenum coverMode,
GrGLenum transformType, const GrGLfloat *transformValues);
void stencilThenCoverStrokePathInstanced(
GrGLsizei numPaths, GrGLenum pathNameType, const GrGLvoid *paths,
GrGLuint pathBase, GrGLint reference, GrGLuint mask, GrGLenum coverMode,
GrGLenum transformType, const GrGLfloat *transformValues);
struct MatrixState {
SkMatrix fViewMatrix;
SkISize fRenderTargetSize;
GrSurfaceOrigin fRenderTargetOrigin;
MatrixState() { this->invalidate(); }
void invalidate() {
fViewMatrix = SkMatrix::InvalidMatrix();
fRenderTargetSize.fWidth = -1;
fRenderTargetSize.fHeight = -1;
fRenderTargetOrigin = (GrSurfaceOrigin) -1;
}
/**
* Gets a matrix that goes from local coordinates to GL normalized device coords.
*/
template<int Size> void getRTAdjustedGLMatrix(GrGLfloat* destMatrix) {
SkMatrix combined;
if (kBottomLeft_GrSurfaceOrigin == fRenderTargetOrigin) {
combined.setAll(SkIntToScalar(2) / fRenderTargetSize.fWidth, 0, -SK_Scalar1,
0, -SkIntToScalar(2) / fRenderTargetSize.fHeight, SK_Scalar1,
0, 0, 1);
} else {
combined.setAll(SkIntToScalar(2) / fRenderTargetSize.fWidth, 0, -SK_Scalar1,
0, SkIntToScalar(2) / fRenderTargetSize.fHeight, -SK_Scalar1,
0, 0, 1);
}
combined.preConcat(fViewMatrix);
GrGLGetMatrix<Size>(destMatrix, combined);
}
};
GrGLGpu* fGpu;
SkAutoTDelete<GrGLNameAllocator> fPathNameAllocator;
Caps fCaps;
MatrixState fHWProjectionMatrixState;
GrStencilSettings fHWPathStencilSettings;
struct PathTexGenData {
GrGLenum fMode;
GrGLint fNumComponents;
GrGLfloat fCoefficients[3 * 3];
};
int fHWActivePathTexGenSets;
SkTArray<PathTexGenData, true> fHWPathTexGenSettings;
};
#endif
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