/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef GrDefaultGeoProcFactory_DEFINED
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#define GrDefaultGeoProcFactory_DEFINED
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#include "GrColorSpaceXform.h"
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#include "GrGeometryProcessor.h"
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#include "GrShaderCaps.h"
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constexpr int kMaxBones = 80; // Supports up to 80 bones per mesh.
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/*
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* A factory for creating default Geometry Processors which simply multiply position by the uniform
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* view matrix and wire through color, coverage, UV coords if requested.
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*/
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namespace GrDefaultGeoProcFactory {
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struct Color {
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enum Type {
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kPremulGrColorUniform_Type,
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kPremulGrColorAttribute_Type,
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kPremulWideColorAttribute_Type,
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kUnpremulSkColorAttribute_Type,
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};
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explicit Color(const SkPMColor4f& color)
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: fType(kPremulGrColorUniform_Type)
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, fColor(color)
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, fColorSpaceXform(nullptr) {}
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Color(Type type)
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: fType(type)
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, fColor(SK_PMColor4fILLEGAL)
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, fColorSpaceXform(nullptr) {
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SkASSERT(type != kPremulGrColorUniform_Type);
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}
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Type fType;
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SkPMColor4f fColor;
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// This only applies to SkColor. Any GrColors are assumed to have been color converted
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// during paint conversion.
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sk_sp<GrColorSpaceXform> fColorSpaceXform;
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};
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struct Coverage {
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enum Type {
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kSolid_Type,
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kUniform_Type,
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kAttribute_Type,
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kAttributeTweakAlpha_Type,
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};
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explicit Coverage(uint8_t coverage) : fType(kUniform_Type), fCoverage(coverage) {}
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Coverage(Type type) : fType(type), fCoverage(0xff) {
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SkASSERT(type != kUniform_Type);
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}
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Type fType;
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uint8_t fCoverage;
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};
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struct LocalCoords {
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enum Type {
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kUnused_Type,
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kUsePosition_Type,
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kHasExplicit_Type,
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kHasTransformed_Type,
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};
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LocalCoords(Type type) : fType(type), fMatrix(nullptr) {}
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LocalCoords(Type type, const SkMatrix* matrix) : fType(type), fMatrix(matrix) {
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SkASSERT(kUnused_Type != type);
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}
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bool hasLocalMatrix() const { return nullptr != fMatrix; }
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Type fType;
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const SkMatrix* fMatrix;
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};
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struct Bones {
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Bones(const float bones[], int boneCount)
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: fBones(bones)
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, fBoneCount(boneCount) {}
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const float* fBones;
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int fBoneCount;
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};
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sk_sp<GrGeometryProcessor> Make(const GrShaderCaps*,
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const Color&,
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const Coverage&,
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const LocalCoords&,
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const SkMatrix& viewMatrix);
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/*
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* Use this factory to create a GrGeometryProcessor that expects a device space vertex position
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* attribute. The view matrix must still be provided to compute correctly transformed
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* coordinates for GrFragmentProcessors. It may fail if the view matrix is not invertible.
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*/
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sk_sp<GrGeometryProcessor> MakeForDeviceSpace(const GrShaderCaps*,
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const Color&,
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const Coverage&,
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const LocalCoords&,
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const SkMatrix& viewMatrix);
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/*
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* Use this factory to create a GrGeometryProcessor that supports skeletal animation through
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* deformation of vertices using matrices that are passed in. This should only be called from
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* GrDrawVerticesOp.
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*/
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sk_sp<GrGeometryProcessor> MakeWithBones(const GrShaderCaps*,
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const Color&,
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const Coverage&,
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const LocalCoords&,
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const Bones&,
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const SkMatrix& viewMatrix);
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};
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#endif
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