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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrCCPRPathProcessor_DEFINED
#define GrCCPRPathProcessor_DEFINED
#include "GrGeometryProcessor.h"
#include "SkPath.h"
#include <array>
class GrOnFlushResourceProvider;
class GrShaderCaps;
/**
* This class draws AA paths using the coverage count masks produced by GrCCPRCoverageProcessor.
*
* Paths are drawn as bloated octagons, and coverage is derived from the coverage count mask and
* fill rule.
*
* The caller must set up an instance buffer as detailed below, then draw indexed-instanced
* triangles using the index and vertex buffers provided by this class.
*/
class GrCCPRPathProcessor : public GrGeometryProcessor {
public:
static constexpr int kPerInstanceIndexCount = 6 * 3;
static sk_sp<GrBuffer> FindOrMakeIndexBuffer(GrOnFlushResourceProvider*);
static sk_sp<GrBuffer> FindOrMakeVertexBuffer(GrOnFlushResourceProvider*);
enum class InstanceAttribs {
kDevBounds,
kDevBounds45,
kViewMatrix, // FIXME: This causes a lot of duplication. It could move to a texel buffer.
kViewTranslate,
kAtlasOffset,
kColor
};
static constexpr int kNumInstanceAttribs = 1 + (int)InstanceAttribs::kColor;
struct Instance {
SkRect fDevBounds;
SkRect fDevBounds45; // Bounding box in "| 1 -1 | * devCoords" space.
// | 1 1 |
std::array<float, 4> fViewMatrix; // {kScaleX, kSkewy, kSkewX, kScaleY}
std::array<float, 2> fViewTranslate;
std::array<int16_t, 2> fAtlasOffset;
uint32_t fColor;
GR_STATIC_ASSERT(SK_SCALAR_IS_FLOAT);
};
GR_STATIC_ASSERT(4 * 16 == sizeof(Instance));
GrCCPRPathProcessor(GrResourceProvider*, sk_sp<GrTextureProxy> atlas, SkPath::FillType,
const GrShaderCaps&);
const char* name() const override { return "GrCCPRPathProcessor"; }
const GrSurfaceProxy* atlasProxy() const { return fAtlasAccess.proxy(); }
const GrTexture* atlas() const { return fAtlasAccess.peekTexture(); }
SkPath::FillType fillType() const { return fFillType; }
const Attribute& getInstanceAttrib(InstanceAttribs attribID) const {
const Attribute& attrib = this->getAttrib((int)attribID);
SkASSERT(Attribute::InputRate::kPerInstance == attrib.fInputRate);
return attrib;
}
const Attribute& getEdgeNormsAttrib() const {
SkASSERT(1 + kNumInstanceAttribs == this->numAttribs());
const Attribute& attrib = this->getAttrib(kNumInstanceAttribs);
SkASSERT(Attribute::InputRate::kPerVertex == attrib.fInputRate);
return attrib;
}
void getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const override;
private:
const SkPath::FillType fFillType;
TextureSampler fAtlasAccess;
typedef GrGeometryProcessor INHERITED;
};
#endif
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