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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 GrDefaultGeoProcFactory_DEFINED
#define GrDefaultGeoProcFactory_DEFINED
#include "include/private/SkColorData.h"
#include "include/private/base/SkAssert.h"
#include <cstdint>
class GrGeometryProcessor;
class SkArenaAlloc;
class SkMatrix;
/*
* A factory for creating default Geometry Processors which simply multiply position by the uniform
* view matrix and wire through color, coverage, UV coords if requested.
*/
namespace GrDefaultGeoProcFactory {
struct Color {
enum Type {
kPremulGrColorUniform_Type,
kPremulGrColorAttribute_Type,
kPremulWideColorAttribute_Type,
};
explicit Color(const SkPMColor4f& color)
: fType(kPremulGrColorUniform_Type)
, fColor(color) {}
Color(Type type)
: fType(type)
, fColor(SK_PMColor4fILLEGAL) {
SkASSERT(type != kPremulGrColorUniform_Type);
}
Type fType;
SkPMColor4f fColor;
};
struct Coverage {
enum Type {
kSolid_Type,
kUniform_Type,
kAttribute_Type,
kAttributeTweakAlpha_Type,
kAttributeUnclamped_Type, // Fragment shader will call saturate(coverage) before using.
// (Not compatible with kAttributeTweakAlpha_Type.)
};
explicit Coverage(uint8_t coverage) : fType(kUniform_Type), fCoverage(coverage) {}
Coverage(Type type) : fType(type), fCoverage(0xff) {
SkASSERT(type != kUniform_Type);
}
Type fType;
uint8_t fCoverage;
};
struct LocalCoords {
enum Type {
kUnused_Type,
kUsePosition_Type,
kHasExplicit_Type,
};
LocalCoords(Type type) : fType(type), fMatrix(nullptr) {}
LocalCoords(Type type, const SkMatrix* matrix) : fType(type), fMatrix(matrix) {
SkASSERT(kUnused_Type != type);
}
bool hasLocalMatrix() const { return nullptr != fMatrix; }
Type fType;
const SkMatrix* fMatrix;
};
GrGeometryProcessor* Make(SkArenaAlloc*,
const Color&,
const Coverage&,
const LocalCoords&,
const SkMatrix& viewMatrix);
/*
* Use this factory to create a GrGeometryProcessor that expects a device space vertex position
* attribute. The view matrix must still be provided to compute correctly transformed
* coordinates for GrFragmentProcessors. It may fail if the view matrix is not invertible.
*/
GrGeometryProcessor* MakeForDeviceSpace(SkArenaAlloc*,
const Color&,
const Coverage&,
const LocalCoords&,
const SkMatrix& viewMatrix);
} // namespace GrDefaultGeoProcFactory
#endif