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6ce447a4ec
skia2/samplecode/SampleCCPRGeometry.cpp
Chris Dalton 6ce447a4ec Eliminate mixed samples as an FBO type or AA type 
From now on, sample counts always refer to the number of actual color
samples, and render targets don't have separate color and stencil
sample counts.

If mixed samples support is available when making a
"GrAAType::kCoverage" draw, then an op may attach and use a mixed
sampled stencil buffer internally. But this will all be invisible to
the client.

After this CL, we temporarily won't have a mode to use nvpr with mixed
samples. That will soon be fixed by a follow-on CL that enables nvpr
with mixed samples in the normal "gl" and "gles" configs.

Bug: skia:
Change-Id: I1cb8277f0d2d0d371f24bb9f39cd473ed5c5c83b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/221878
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
2019-06-24 04:08:45 +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 {
public:
CCPRGeometryView() { this->updateGpuData(); }
void onDrawContent(SkCanvas*) override;
Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override;
bool onClick(Sample::Click*) override;
bool onQuery(Sample::Event* evt) override;
private:
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;
typedef Sample INHERITED;
};
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::IsZeroArea::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();
const GrBackendFormat format =
ctx->priv().caps()->getBackendFormatFromGrColorType(GrColorType::kAlpha_F16,
GrSRGBEncoded::kNo);
sk_sp<GrRenderTargetContext> ccbuff =
ctx->priv().makeDeferredRenderTargetContext(format, SkBackingFit::kApprox,
this->width(), this->height(),
kAlpha_half_GrPixelConfig,
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));
} 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));
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().fOutputSwizzle);
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(Sample* target, int ptIdx) : Sample::Click(target), fPtIdx(ptIdx) {}
void doClick(SkPoint points[]) {
if (fPtIdx >= 0) {
this->dragPoint(points, fPtIdx);
} else {
for (int i = 0; i < 4; ++i) {
this->dragPoint(points, i);
}
}
}
private:
void dragPoint(SkPoint points[], int idx) {
SkIPoint delta = fICurr - fIPrev;
points[idx] += SkPoint::Make(delta.x(), delta.y());
}
int fPtIdx;
};
Sample::Click* CCPRGeometryView::onFindClickHandler(SkScalar x, SkScalar y, unsigned) {
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(this, i);
}
}
return new Click(this, -1);
}
bool CCPRGeometryView::onClick(Sample::Click* click) {
Click* myClick = (Click*)click;
myClick->doClick(fPoints);
this->updateAndInval();
return true;
}
bool CCPRGeometryView::onQuery(Sample::Event* evt) {
if (Sample::TitleQ(*evt)) {
Sample::TitleR(evt, "CCPRGeometry");
return true;
}
SkUnichar unichar;
if (Sample::CharQ(*evt, &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 this->INHERITED::onQuery(evt);
}
DEF_SAMPLE(return new CCPRGeometryView;)
#endif // SK_SUPPORT_GPU
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