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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/GrGLTypes.h"
#include "glsl/GrGLSLUtil.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 GrStrokeInfo&) override;
virtual GrPathRange* createPathRange(GrPathRange::PathGenerator*,
const GrStrokeInfo&) override;
/* Called when the 3D context state is unknown. */
void resetContext();
/**
* Called when the context either is about to be lost or is lost. DisconnectType indicates
* whether GPU resources should be cleaned up or abandoned when this is called.
*/
void disconnect(GrGpu::DisconnectType);
bool shouldBindFragmentInputs() const {
return fCaps.bindFragmentInputSupport;
}
// 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);
protected:
void onStencilPath(const StencilPathArgs&, const GrPath*) override;
void onDrawPath(const GrPipeline&,
const GrPrimitiveProcessor&,
const GrStencilSettings&,
const GrPath*) override;
void onDrawPaths(const GrPipeline&,
const GrPrimitiveProcessor&,
const GrStencilSettings&,
const GrPathRange*,
const void* indices,
PathIndexType,
const float transformValues[],
PathTransformType,
int count) override;
private:
/**
* Mark certain functionality as not supported.
*/
struct Caps {
bool bindFragmentInputSupport : 1;
};
void flushPathStencilSettings(const GrStencilSettings&);
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(float* 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);
GrGLSLGetMatrix<Size>(destMatrix, combined);
}
};
GrGLGpu* gpu();
GrGLuint fFirstPreallocatedPathID;
GrGLsizei fPreallocatedPathCount;
MatrixState fHWProjectionMatrixState;
GrStencilSettings fHWPathStencilSettings;
Caps fCaps;
};
#endif
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