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skia2/samplecode/SampleCCPRGeometry.cpp
Greg Daniel d358cbebd4 Add support for plumbing GrDstSampleType through Ops and Pipeline creation. 
This CL adds a new type GrDstSampleType to say how we will sample the dst.

We add tracking of the GrDstSampleType in the recording of GrOps and
then during execution passing the information along to the GrPipeline.

In general the tracking of GrDstSampleType is a global state of a GrOpsTask
so it is kept separate fro the DstProxyView which is more specific to a
single Op on the GrOpsTask.

Bug: skia:10409
Change-Id: Ie843c31f2e48a887daf96cee99ed159b196cb545
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/315645
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2020-09-11 14:42:34 +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 "include/gpu/GrDirectContext.h"
#include "samplecode/Sample.h"
#include "src/core/SkRectPriv.h"
#include "src/gpu/GrContextPriv.h"
#include "src/gpu/GrGpu.h"
#include "src/gpu/GrMemoryPool.h"
#include "src/gpu/GrOnFlushResourceProvider.h"
#include "src/gpu/GrOpFlushState.h"
#include "src/gpu/GrRecordingContextPriv.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/GrGSCoverageProcessor.h"
#include "src/gpu/ccpr/GrVSCoverageProcessor.h"
#include "src/gpu/geometry/GrPathUtils.h"
#include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"
#include "src/gpu/ops/GrDrawOp.h"
#ifdef SK_GL
#include "src/gpu/gl/GrGLGpu.h"
#endif
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::kCubics;
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;
SkPaint::Join fStrokeJoin = SkPaint::kMiter_Join;
SkPaint::Cap fStrokeCap = SkPaint::kButt_Cap;
bool fDoStroke = true;
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 onPrePrepare(GrRecordingContext*,
const GrSurfaceProxyView* writeView,
GrAppliedClip*,
const GrXferProcessor::DstProxyView&,
GrXferBarrierFlags renderPassXferBarriers) override {}
void onPrepare(GrOpFlushState*) override {}
void onExecute(GrOpFlushState*, const SkRect& chainBounds) override;
CCPRGeometryView* fView;
using INHERITED = GrDrawOp;
};
class CCPRGeometryView::VisualizeCoverageCountFP : public GrFragmentProcessor {
public:
static std::unique_ptr<GrFragmentProcessor> Make(std::unique_ptr<GrFragmentProcessor> inputFP) {
return std::unique_ptr<GrFragmentProcessor>(
new VisualizeCoverageCountFP(std::move(inputFP)));
}
private:
const char* name() const override {
return "VisualizeCoverageCountFP";
}
std::unique_ptr<GrFragmentProcessor> clone() const override {
return std::unique_ptr<GrFragmentProcessor>(new VisualizeCoverageCountFP(*this));
}
VisualizeCoverageCountFP(std::unique_ptr<GrFragmentProcessor> inputFP)
: GrFragmentProcessor(kTestFP_ClassID, kNone_OptimizationFlags) {
this->registerChild(std::move(inputFP));
}
VisualizeCoverageCountFP(const VisualizeCoverageCountFP& that)
: GrFragmentProcessor(kTestFP_ClassID, kNone_OptimizationFlags) {
this->cloneAndRegisterAllChildProcessors(that);
}
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;
static constexpr int kInputFPIndex = 0;
SkString inputColor = this->invokeChild(kInputFPIndex, args);
f->codeAppendf("half count = %s.a;", inputColor.c_str());
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);
SkPaint outlinePaint;
outlinePaint.setColor(0xff808080);
outlinePaint.setStyle(SkPaint::kStroke_Style);
if (fDoStroke) {
outlinePaint.setStrokeWidth(fStrokeWidth);
} else {
outlinePaint.setStrokeWidth(0);
}
outlinePaint.setStrokeJoin(fStrokeJoin);
outlinePaint.setStrokeCap(fStrokeCap);
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;
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 if (GrRenderTargetContext* rtc =
canvas->internal_private_accessTopLayerRenderTargetContext()) {
// Render coverage count.
auto ctx = canvas->recordingContext();
SkASSERT(ctx);
GrOpMemoryPool* pool = ctx->priv().opMemoryPool();
int width = this->width();
int height = this->height();
auto ccbuff = GrRenderTargetContext::Make(
ctx, GrColorType::kAlpha_F16, nullptr, SkBackingFit::kApprox, {width, height});
SkASSERT(ccbuff);
ccbuff->clear(SK_PMColor4fTRANSPARENT);
ccbuff->priv().testingOnly_addDrawOp(pool->allocate<DrawCoverageCountOp>(this));
// Visualize coverage count in main canvas.
GrPaint paint;
paint.setColorFragmentProcessor(VisualizeCoverageCountFP::Make(
GrTextureEffect::Make(ccbuff->readSurfaceView(), ccbuff->colorInfo().alphaType())));
paint.setPorterDuffXPFactory(SkBlendMode::kSrcOver);
rtc->drawRect(nullptr, std::move(paint), GrAA::kNo, SkMatrix::I(),
SkRect::MakeIWH(this->width(), this->height()));
} 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();
#ifdef SK_GL
auto direct = state->gpu()->getContext();
GrGLGpu* glGpu = GrBackendApi::kOpenGL == direct->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));
}
#endif
GrPipeline pipeline(GrScissorTest::kDisabled, SkBlendMode::kPlus,
state->drawOpArgs().writeSwizzle());
std::unique_ptr<GrCCCoverageProcessor> proc;
if (state->caps().shaderCaps()->geometryShaderSupport()) {
proc = std::make_unique<GrGSCoverageProcessor>();
} else {
proc = std::make_unique<GrVSCoverageProcessor>();
}
SkDEBUGCODE(proc->enableDebugBloat(kDebugBloat));
GrOpsRenderPass* renderPass = state->opsRenderPass();
for (int i = 0; i < proc->numSubpasses(); ++i) {
proc->reset(fView->fPrimitiveType, i, rp);
proc->bindPipeline(state, pipeline, this->bounds());
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->bindBuffers(renderPass, std::move(instBuff));
proc->drawInstances(renderPass, fView->fQuadPointInstances.count(), 0);
}
} 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->bindBuffers(renderPass, std::move(instBuff));
proc->drawInstances(renderPass, fView->fTriPointInstances.count(), 0);
}
}
}
#ifdef SK_GL
if (glGpu) {
direct->resetContext(kMisc_GrGLBackendState);
}
#endif
}
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 true;
}
if (unichar == 'J') {
fStrokeJoin = (SkPaint::Join)((fStrokeJoin + 1) % 3);
this->updateAndInval();
return true;
}
if (unichar == 'C') {
fStrokeCap = (SkPaint::Cap)((fStrokeCap + 1) % 3);
this->updateAndInval();
return true;
}
return false;
}
DEF_SAMPLE(return new CCPRGeometryView;)
#endif // SK_SUPPORT_GPU
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