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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 "GrGeometryProcessor.h"
class GrDrawState;
/*
* 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. Right now this is only
* used in the creation of optimized draw states because adding default GPs to the drawstate can
* interfere with batching due to updating the drawstate.
*/
namespace GrDefaultGeoProcFactory {
// Structs for adding vertex attributes
struct PositionAttr {
SkPoint fPosition;
};
struct PositionCoverageAttr {
SkPoint fPosition;
GrColor fCoverage;
};
struct PositionColorAttr {
SkPoint fPosition;
SkColor fColor;
};
struct PositionColorCoverageAttr {
SkPoint fPosition;
SkColor fColor;
GrColor fCoverage;
};
struct PositionLocalCoordAttr {
SkPoint fPosition;
SkPoint fLocalCoord;
};
struct PositionLocalCoordCoverageAttr {
SkPoint fPosition;
SkPoint fLocalCoord;
GrColor fCoverage;
};
struct PositionColorLocalCoordAttr {
SkPoint fPosition;
GrColor fColor;
SkPoint fLocalCoord;
};
struct PositionColorLocalCoordCoverage {
SkPoint fPosition;
GrColor fColor;
SkPoint fLocalCoord;
GrColor fCoverage;
};
struct Color {
enum Type {
kNone_Type,
kUniform_Type,
kAttribute_Type,
};
Color(GrColor color) : fType(kUniform_Type), fColor(color) {}
Color(Type type) : fType(type), fColor(GrColor_ILLEGAL) {
SkASSERT(type != kUniform_Type);
// TODO This is temporary
if (kAttribute_Type == type) {
fColor = GrColor_WHITE;
}
}
Type fType;
GrColor fColor;
};
struct Coverage {
enum Type {
kNone_Type,
kSolid_Type,
kUniform_Type,
kAttribute_Type,
};
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,
kHasTransformed_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;
};
const GrGeometryProcessor* Create(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.
*/
const GrGeometryProcessor* CreateForDeviceSpace(const Color&,
const Coverage&,
const LocalCoords&,
const SkMatrix& viewMatrix);
inline size_t DefaultVertexStride() { return sizeof(PositionAttr); }
};
#endif
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