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skia2/samplecode/SampleCCPRGeometry.cpp
Robert Phillips 405413fcec Clarify that the OpArgs' outputSwizzle comes from its GrRenderTargetProxy 
Since we want to collect shader information early, this attempts to make clear that numSamples, origin and outputSwizzle can all be obtained from the target renderTargetProxy.


Change-Id: I42e0fd79e2163f17673ccdd344a31fbaadac5f53
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/246298
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2019-10-04 18:03:32 +00:00

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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.
*/
#include "include/core/SkTypes.h"
#if SK_SUPPORT_GPU
#include "include/core/SkCanvas.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPath.h"
#include "samplecode/Sample.h"
#include "src/core/SkMakeUnique.h"
#include "src/core/SkRectPriv.h"
#include "src/gpu/GrClip.h"
#include "src/gpu/GrContextPriv.h"
#include "src/gpu/GrMemoryPool.h"
#include "src/gpu/GrRenderTargetContext.h"
#include "src/gpu/GrRenderTargetContextPriv.h"
#include "src/gpu/GrResourceProvider.h"
#include "src/gpu/ccpr/GrCCCoverageProcessor.h"
#include "src/gpu/ccpr/GrCCFillGeometry.h"
#include "src/gpu/ccpr/GrCCStroker.h"
#include "src/gpu/ccpr/GrGSCoverageProcessor.h"
#include "src/gpu/ccpr/GrVSCoverageProcessor.h"
#include "src/gpu/geometry/GrPathUtils.h"
#include "src/gpu/gl/GrGLGpu.h"
#include "src/gpu/glsl/GrGLSLFragmentProcessor.h"
#include "src/gpu/ops/GrDrawOp.h"
using TriPointInstance = GrCCCoverageProcessor::TriPointInstance;
using QuadPointInstance = GrCCCoverageProcessor::QuadPointInstance;
using PrimitiveType = GrCCCoverageProcessor::PrimitiveType;
static constexpr float kDebugBloat = 40;
/**
* This sample visualizes the AA bloat geometry generated by the ccpr geometry shaders. It
* increases the AA bloat by 50x and outputs color instead of coverage (coverage=+1 -> green,
* coverage=0 -> black, coverage=-1 -> red). Use the keys 1-7 to cycle through the different
* geometry processors.
*/
class CCPRGeometryView : public Sample {
void onOnceBeforeDraw() override { this->updateGpuData(); }
void onDrawContent(SkCanvas*) override;
Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override;
bool onClick(Sample::Click*) override;
bool onChar(SkUnichar) override;
SkString name() override { return SkString("CCPRGeometry"); }
class Click;
class DrawCoverageCountOp;
class VisualizeCoverageCountFP;
void updateAndInval() { this->updateGpuData(); }
void updateGpuData();
PrimitiveType fPrimitiveType = PrimitiveType::kTriangles;
SkCubicType fCubicType;
SkMatrix fCubicKLM;
SkPoint fPoints[4] = {
{100.05f, 100.05f}, {400.75f, 100.05f}, {400.75f, 300.95f}, {100.05f, 300.95f}};
float fConicWeight = .5;
float fStrokeWidth = 40;
bool fDoStroke = false;
SkTArray<TriPointInstance> fTriPointInstances;
SkTArray<QuadPointInstance> fQuadPointInstances;
SkPath fPath;
};
class CCPRGeometryView::DrawCoverageCountOp : public GrDrawOp {
DEFINE_OP_CLASS_ID
public:
DrawCoverageCountOp(CCPRGeometryView* view) : INHERITED(ClassID()), fView(view) {
this->setBounds(SkRect::MakeIWH(fView->width(), fView->height()), GrOp::HasAABloat::kNo,
GrOp::IsHairline::kNo);
}
const char* name() const override {
return "[Testing/Sample code] CCPRGeometryView::DrawCoverageCountOp";
}
private:
FixedFunctionFlags fixedFunctionFlags() const override { return FixedFunctionFlags::kNone; }
GrProcessorSet::Analysis finalize(const GrCaps&, const GrAppliedClip*,
bool hasMixedSampledCoverage, GrClampType) override {
return GrProcessorSet::EmptySetAnalysis();
}
void onPrepare(GrOpFlushState*) override {}
void onExecute(GrOpFlushState*, const SkRect& chainBounds) override;
CCPRGeometryView* fView;
typedef GrDrawOp INHERITED;
};
class CCPRGeometryView::VisualizeCoverageCountFP : public GrFragmentProcessor {
public:
VisualizeCoverageCountFP() : GrFragmentProcessor(kTestFP_ClassID, kNone_OptimizationFlags) {}
private:
const char* name() const override {
return "[Testing/Sample code] CCPRGeometryView::VisualizeCoverageCountFP";
}
std::unique_ptr<GrFragmentProcessor> clone() const override {
return skstd::make_unique<VisualizeCoverageCountFP>();
}
void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override {}
bool onIsEqual(const GrFragmentProcessor&) const override { return true; }
class Impl : public GrGLSLFragmentProcessor {
void emitCode(EmitArgs& args) override {
GrGLSLFPFragmentBuilder* f = args.fFragBuilder;
f->codeAppendf("half count = %s.a;", args.fInputColor);
f->codeAppendf("%s = half4(clamp(-count, 0, 1), clamp(+count, 0, 1), 0, abs(count));",
args.fOutputColor);
}
};
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override { return new Impl; }
};
static void draw_klm_line(int w, int h, SkCanvas* canvas, const SkScalar line[3], SkColor color) {
SkPoint p1, p2;
if (SkScalarAbs(line[1]) > SkScalarAbs(line[0])) {
// Draw from vertical edge to vertical edge.
p1 = {0, -line[2] / line[1]};
p2 = {(SkScalar)w, (-line[2] - w * line[0]) / line[1]};
} else {
// Draw from horizontal edge to horizontal edge.
p1 = {-line[2] / line[0], 0};
p2 = {(-line[2] - h * line[1]) / line[0], (SkScalar)h};
}
SkPaint linePaint;
linePaint.setColor(color);
linePaint.setAlpha(128);
linePaint.setStyle(SkPaint::kStroke_Style);
linePaint.setStrokeWidth(0);
linePaint.setAntiAlias(true);
canvas->drawLine(p1, p2, linePaint);
}
void CCPRGeometryView::onDrawContent(SkCanvas* canvas) {
canvas->clear(SK_ColorBLACK);
if (!fDoStroke) {
SkPaint outlinePaint;
outlinePaint.setColor(0x80ffffff);
outlinePaint.setStyle(SkPaint::kStroke_Style);
outlinePaint.setStrokeWidth(0);
outlinePaint.setAntiAlias(true);
canvas->drawPath(fPath, outlinePaint);
}
#if 0
SkPaint gridPaint;
gridPaint.setColor(0x10000000);
gridPaint.setStyle(SkPaint::kStroke_Style);
gridPaint.setStrokeWidth(0);
gridPaint.setAntiAlias(true);
for (int y = 0; y < this->height(); y += kDebugBloat) {
canvas->drawLine(0, y, this->width(), y, gridPaint);
}
for (int x = 0; x < this->width(); x += kDebugBloat) {
canvas->drawLine(x, 0, x, this->height(), outlinePaint);
}
#endif
SkString caption;
if (GrRenderTargetContext* rtc = canvas->internal_private_accessTopLayerRenderTargetContext()) {
// Render coverage count.
GrContext* ctx = canvas->getGrContext();
SkASSERT(ctx);
GrOpMemoryPool* pool = ctx->priv().opMemoryPool();
auto ccbuff = ctx->priv().makeDeferredRenderTargetContext(SkBackingFit::kApprox,
this->width(), this->height(),
GrColorType::kAlpha_F16, nullptr);
SkASSERT(ccbuff);
ccbuff->clear(nullptr, SK_PMColor4fTRANSPARENT,
GrRenderTargetContext::CanClearFullscreen::kYes);
ccbuff->priv().testingOnly_addDrawOp(pool->allocate<DrawCoverageCountOp>(this));
// Visualize coverage count in main canvas.
GrPaint paint;
paint.addColorFragmentProcessor(
GrSimpleTextureEffect::Make(sk_ref_sp(ccbuff->asTextureProxy()), SkMatrix::I()));
paint.addColorFragmentProcessor(
skstd::make_unique<VisualizeCoverageCountFP>());
paint.setPorterDuffXPFactory(SkBlendMode::kSrcOver);
rtc->drawRect(GrNoClip(), std::move(paint), GrAA::kNo, SkMatrix::I(),
SkRect::MakeIWH(this->width(), this->height()));
// Add label.
caption.appendf("PrimitiveType_%s",
GrCCCoverageProcessor::PrimitiveTypeName(fPrimitiveType));
if (PrimitiveType::kCubics == fPrimitiveType) {
caption.appendf(" (%s)", SkCubicTypeName(fCubicType));
} else if (PrimitiveType::kConics == fPrimitiveType) {
caption.appendf(" (w=%f)", fConicWeight);
}
if (fDoStroke) {
caption.appendf(" (stroke_width=%f)", fStrokeWidth);
}
} else {
caption = "Use GPU backend to visualize geometry.";
}
SkPaint pointsPaint;
pointsPaint.setColor(SK_ColorBLUE);
pointsPaint.setStrokeWidth(8);
pointsPaint.setAntiAlias(true);
if (PrimitiveType::kCubics == fPrimitiveType) {
canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, fPoints, pointsPaint);
if (!fDoStroke) {
int w = this->width(), h = this->height();
draw_klm_line(w, h, canvas, &fCubicKLM[0], SK_ColorYELLOW);
draw_klm_line(w, h, canvas, &fCubicKLM[3], SK_ColorBLUE);
draw_klm_line(w, h, canvas, &fCubicKLM[6], SK_ColorRED);
}
} else {
canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, fPoints, pointsPaint);
canvas->drawPoints(SkCanvas::kPoints_PointMode, 1, fPoints + 3, pointsPaint);
}
SkFont font(nullptr, 20);
SkPaint captionPaint;
captionPaint.setColor(SK_ColorWHITE);
canvas->drawString(caption, 10, 30, font, captionPaint);
}
void CCPRGeometryView::updateGpuData() {
using Verb = GrCCFillGeometry::Verb;
fTriPointInstances.reset();
fQuadPointInstances.reset();
fPath.reset();
fPath.moveTo(fPoints[0]);
if (PrimitiveType::kCubics == fPrimitiveType) {
double t[2], s[2];
fCubicType = GrPathUtils::getCubicKLM(fPoints, &fCubicKLM, t, s);
GrCCFillGeometry geometry;
geometry.beginContour(fPoints[0]);
geometry.cubicTo(fPoints, kDebugBloat / 2, kDebugBloat / 2);
geometry.endContour();
int ptsIdx = 0;
for (Verb verb : geometry.verbs()) {
switch (verb) {
case Verb::kLineTo:
++ptsIdx;
continue;
case Verb::kMonotonicQuadraticTo:
ptsIdx += 2;
continue;
case Verb::kMonotonicCubicTo:
fQuadPointInstances.push_back().set(&geometry.points()[ptsIdx], 0, 0);
ptsIdx += 3;
continue;
default:
continue;
}
}
fPath.cubicTo(fPoints[1], fPoints[2], fPoints[3]);
} else if (PrimitiveType::kTriangles != fPrimitiveType) {
SkPoint P3[3] = {fPoints[0], fPoints[1], fPoints[3]};
GrCCFillGeometry geometry;
geometry.beginContour(P3[0]);
if (PrimitiveType::kQuadratics == fPrimitiveType) {
geometry.quadraticTo(P3);
fPath.quadTo(fPoints[1], fPoints[3]);
} else {
SkASSERT(PrimitiveType::kConics == fPrimitiveType);
geometry.conicTo(P3, fConicWeight);
fPath.conicTo(fPoints[1], fPoints[3], fConicWeight);
}
geometry.endContour();
int ptsIdx = 0, conicWeightIdx = 0;
for (Verb verb : geometry.verbs()) {
if (Verb::kBeginContour == verb ||
Verb::kEndOpenContour == verb ||
Verb::kEndClosedContour == verb) {
continue;
}
if (Verb::kLineTo == verb) {
++ptsIdx;
continue;
}
SkASSERT(Verb::kMonotonicQuadraticTo == verb || Verb::kMonotonicConicTo == verb);
if (PrimitiveType::kQuadratics == fPrimitiveType &&
Verb::kMonotonicQuadraticTo == verb) {
fTriPointInstances.push_back().set(
&geometry.points()[ptsIdx], Sk2f(0, 0),
TriPointInstance::Ordering::kXYTransposed);
} else if (PrimitiveType::kConics == fPrimitiveType &&
Verb::kMonotonicConicTo == verb) {
fQuadPointInstances.push_back().setW(&geometry.points()[ptsIdx], Sk2f(0, 0),
geometry.getConicWeight(conicWeightIdx++));
}
ptsIdx += 2;
}
} else {
fTriPointInstances.push_back().set(
fPoints[0], fPoints[1], fPoints[3], Sk2f(0, 0),
TriPointInstance::Ordering::kXYTransposed);
fPath.lineTo(fPoints[1]);
fPath.lineTo(fPoints[3]);
fPath.close();
}
}
void CCPRGeometryView::DrawCoverageCountOp::onExecute(GrOpFlushState* state,
const SkRect& chainBounds) {
GrResourceProvider* rp = state->resourceProvider();
GrContext* context = state->gpu()->getContext();
GrGLGpu* glGpu = GrBackendApi::kOpenGL == context->backend()
? static_cast<GrGLGpu*>(state->gpu())
: nullptr;
if (glGpu) {
glGpu->handleDirtyContext();
// GR_GL_CALL(glGpu->glInterface(), PolygonMode(GR_GL_FRONT_AND_BACK, GR_GL_LINE));
GR_GL_CALL(glGpu->glInterface(), Enable(GR_GL_LINE_SMOOTH));
}
GrPipeline pipeline(GrScissorTest::kDisabled, SkBlendMode::kPlus,
state->drawOpArgs().outputSwizzle());
std::unique_ptr<GrCCCoverageProcessor> proc;
if (state->caps().shaderCaps()->geometryShaderSupport()) {
proc = skstd::make_unique<GrGSCoverageProcessor>();
} else {
proc = skstd::make_unique<GrVSCoverageProcessor>();
}
if (!fView->fDoStroke) {
proc->reset(fView->fPrimitiveType, rp);
SkDEBUGCODE(proc->enableDebugBloat(kDebugBloat));
SkSTArray<1, GrMesh> mesh;
if (PrimitiveType::kCubics == fView->fPrimitiveType ||
PrimitiveType::kConics == fView->fPrimitiveType) {
sk_sp<GrGpuBuffer> instBuff(
rp->createBuffer(fView->fQuadPointInstances.count() * sizeof(QuadPointInstance),
GrGpuBufferType::kVertex, kDynamic_GrAccessPattern,
fView->fQuadPointInstances.begin()));
if (!fView->fQuadPointInstances.empty() && instBuff) {
proc->appendMesh(std::move(instBuff), fView->fQuadPointInstances.count(), 0, &mesh);
}
} else {
sk_sp<GrGpuBuffer> instBuff(
rp->createBuffer(fView->fTriPointInstances.count() * sizeof(TriPointInstance),
GrGpuBufferType::kVertex, kDynamic_GrAccessPattern,
fView->fTriPointInstances.begin()));
if (!fView->fTriPointInstances.empty() && instBuff) {
proc->appendMesh(std::move(instBuff), fView->fTriPointInstances.count(), 0, &mesh);
}
}
if (!mesh.empty()) {
SkASSERT(1 == mesh.count());
proc->draw(state, pipeline, nullptr, mesh.begin(), 1, this->bounds());
}
} else if (PrimitiveType::kConics != fView->fPrimitiveType) { // No conic stroke support yet.
GrCCStroker stroker(0,0,0);
SkPaint p;
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(fView->fStrokeWidth);
p.setStrokeJoin(SkPaint::kMiter_Join);
p.setStrokeMiter(4);
// p.setStrokeCap(SkPaint::kRound_Cap);
stroker.parseDeviceSpaceStroke(fView->fPath, SkPathPriv::PointData(fView->fPath),
SkStrokeRec(p), p.getStrokeWidth(), GrScissorTest::kDisabled,
SkIRect::MakeWH(fView->width(), fView->height()), {0, 0});
GrCCStroker::BatchID batchID = stroker.closeCurrentBatch();
GrOnFlushResourceProvider onFlushRP(context->priv().drawingManager());
stroker.prepareToDraw(&onFlushRP);
SkIRect ibounds;
this->bounds().roundOut(&ibounds);
stroker.drawStrokes(state, proc.get(), batchID, ibounds);
}
if (glGpu) {
context->resetContext(kMisc_GrGLBackendState);
}
}
class CCPRGeometryView::Click : public Sample::Click {
public:
Click(int ptIdx) : fPtIdx(ptIdx) {}
void doClick(SkPoint points[]) {
if (fPtIdx >= 0) {
points[fPtIdx] += fCurr - fPrev;
} else {
for (int i = 0; i < 4; ++i) {
points[i] += fCurr - fPrev;
}
}
}
private:
int fPtIdx;
};
Sample::Click* CCPRGeometryView::onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) {
for (int i = 0; i < 4; ++i) {
if (PrimitiveType::kCubics != fPrimitiveType && 2 == i) {
continue;
}
if (fabs(x - fPoints[i].x()) < 20 && fabsf(y - fPoints[i].y()) < 20) {
return new Click(i);
}
}
return new Click(-1);
}
bool CCPRGeometryView::onClick(Sample::Click* click) {
Click* myClick = (Click*)click;
myClick->doClick(fPoints);
this->updateAndInval();
return true;
}
bool CCPRGeometryView::onChar(SkUnichar unichar) {
if (unichar >= '1' && unichar <= '4') {
fPrimitiveType = PrimitiveType(unichar - '1');
if (fPrimitiveType >= PrimitiveType::kWeightedTriangles) {
fPrimitiveType = (PrimitiveType) ((int)fPrimitiveType + 1);
}
this->updateAndInval();
return true;
}
float* valueToScale = nullptr;
if (fDoStroke) {
valueToScale = &fStrokeWidth;
} else if (PrimitiveType::kConics == fPrimitiveType) {
valueToScale = &fConicWeight;
}
if (valueToScale) {
if (unichar == '+') {
*valueToScale *= 2;
this->updateAndInval();
return true;
}
if (unichar == '+' || unichar == '=') {
*valueToScale *= 5/4.f;
this->updateAndInval();
return true;
}
if (unichar == '-') {
*valueToScale *= 4/5.f;
this->updateAndInval();
return true;
}
if (unichar == '_') {
*valueToScale *= .5f;
this->updateAndInval();
return true;
}
}
if (unichar == 'D') {
SkDebugf(" SkPoint fPoints[4] = {\n");
SkDebugf(" {%ff, %ff},\n", fPoints[0].x(), fPoints[0].y());
SkDebugf(" {%ff, %ff},\n", fPoints[1].x(), fPoints[1].y());
SkDebugf(" {%ff, %ff},\n", fPoints[2].x(), fPoints[2].y());
SkDebugf(" {%ff, %ff}\n", fPoints[3].x(), fPoints[3].y());
SkDebugf(" };\n");
return true;
}
if (unichar == 'S') {
fDoStroke = !fDoStroke;
this->updateAndInval();
}
return false;
}
DEF_SAMPLE(return new CCPRGeometryView;)
#endif // SK_SUPPORT_GPU
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