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skia2/samplecode/SampleCCPRGeometry.cpp
Brian Salomon 493489054f Refactor GrPipeline dynamic state. 
Remove scissor rect from GrPipeline.

Draws can specify "fixed dynamic state" which doesn't use the dynamism at
all or can specify dynamic state arrays with an entry per GrMesh.

When we state other than scissor rects this will allow the caller to
use a mix of truly dynamic and fixed dynamic state. So a caller that
only has dynamic scissor rects doesn't need to store its remaining
unvarying state in an array.

Change-Id: I8fcc07eb600c72a26cc712b185755c2116021a8a
Reviewed-on: https://skia-review.googlesource.com/137223
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2018-06-26 15:35:12 +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 "SkTypes.h"
#if SK_SUPPORT_GPU
#include "GrContextPriv.h"
#include "GrPathUtils.h"
#include "GrRenderTargetContext.h"
#include "GrRenderTargetContextPriv.h"
#include "GrResourceProvider.h"
#include "SampleCode.h"
#include "SkCanvas.h"
#include "SkMakeUnique.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkRectPriv.h"
#include "SkView.h"
#include "ccpr/GrCCCoverageProcessor.h"
#include "ccpr/GrCCGeometry.h"
#include "gl/GrGLGpu.cpp"
#include "glsl/GrGLSLFragmentProcessor.h"
#include "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 SampleView {
public:
CCPRGeometryView() { this->updateGpuData(); }
void onDrawContent(SkCanvas*) override;
SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override;
bool onClick(SampleView::Click*) override;
bool onQuery(SkEvent* 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;
SkTArray<TriPointInstance> fTriPointInstances;
SkTArray<QuadPointInstance> fQuadPointInstances;
typedef SampleView INHERITED;
};
class CCPRGeometryView::DrawCoverageCountOp : public GrDrawOp {
DEFINE_OP_CLASS_ID
public:
DrawCoverageCountOp(CCPRGeometryView* view) : INHERITED(ClassID()), fView(view) {
this->setBounds(SkRectPriv::MakeLargest(), 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; }
RequiresDstTexture finalize(const GrCaps&, const GrAppliedClip*,
GrPixelConfigIsClamped) override {
return RequiresDstTexture::kNo;
}
bool onCombineIfPossible(GrOp* other, const GrCaps& caps) override { return false; }
void onPrepare(GrOpFlushState*) override {}
void onExecute(GrOpFlushState*) 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);
SkPath outline;
outline.moveTo(fPoints[0]);
switch (fPrimitiveType) {
case PrimitiveType::kTriangles:
case PrimitiveType::kWeightedTriangles:
outline.lineTo(fPoints[1]);
outline.lineTo(fPoints[3]);
outline.close();
break;
case PrimitiveType::kQuadratics:
outline.quadTo(fPoints[1], fPoints[3]);
break;
case PrimitiveType::kCubics:
outline.cubicTo(fPoints[1], fPoints[2], fPoints[3]);
break;
case PrimitiveType::kConics:
outline.conicTo(fPoints[1], fPoints[3], fConicWeight);
break;
}
SkPaint outlinePaint;
outlinePaint.setColor(0x80ffffff);
outlinePaint.setStyle(SkPaint::kStroke_Style);
outlinePaint.setStrokeWidth(0);
outlinePaint.setAntiAlias(true);
canvas->drawPath(outline, 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);
sk_sp<GrRenderTargetContext> ccbuff =
ctx->contextPriv().makeDeferredRenderTargetContext(SkBackingFit::kApprox,
this->width(), this->height(),
kAlpha_half_GrPixelConfig,
nullptr);
SkASSERT(ccbuff);
ccbuff->clear(nullptr, 0, GrRenderTargetContext::CanClearFullscreen::kYes);
ccbuff->priv().testingOnly_addDrawOp(skstd::make_unique<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);
}
} else {
caption = "Use GPU backend to visualize geometry.";
}
SkPaint pointsPaint;
pointsPaint.setColor(SK_ColorBLUE);
pointsPaint.setStrokeWidth(8);
pointsPaint.setAntiAlias(true);
if (PrimitiveType::kCubics == fPrimitiveType) {
int w = this->width(), h = this->height();
canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, fPoints, pointsPaint);
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);
}
SkPaint captionPaint;
captionPaint.setTextSize(20);
captionPaint.setColor(SK_ColorWHITE);
captionPaint.setAntiAlias(true);
canvas->drawText(caption.c_str(), caption.size(), 10, 30, captionPaint);
}
void CCPRGeometryView::updateGpuData() {
fTriPointInstances.reset();
fQuadPointInstances.reset();
if (PrimitiveType::kCubics == fPrimitiveType) {
double t[2], s[2];
fCubicType = GrPathUtils::getCubicKLM(fPoints, &fCubicKLM, t, s);
GrCCGeometry geometry;
geometry.beginContour(fPoints[0]);
geometry.cubicTo(fPoints, kDebugBloat / 2, kDebugBloat / 2);
geometry.endContour();
int ptsIdx = 0;
for (GrCCGeometry::Verb verb : geometry.verbs()) {
switch (verb) {
case GrCCGeometry::Verb::kLineTo:
++ptsIdx;
continue;
case GrCCGeometry::Verb::kMonotonicQuadraticTo:
ptsIdx += 2;
continue;
case GrCCGeometry::Verb::kMonotonicCubicTo:
fQuadPointInstances.push_back().set(&geometry.points()[ptsIdx], 0, 0);
ptsIdx += 3;
continue;
default:
continue;
}
}
} else if (PrimitiveType::kTriangles != fPrimitiveType) {
SkPoint P3[3] = {fPoints[0], fPoints[1], fPoints[3]};
GrCCGeometry geometry;
geometry.beginContour(P3[0]);
if (PrimitiveType::kQuadratics == fPrimitiveType) {
geometry.quadraticTo(P3);
} else {
SkASSERT(PrimitiveType::kConics == fPrimitiveType);
geometry.conicTo(P3, fConicWeight);
}
geometry.endContour();
int ptsIdx = 0, conicWeightIdx = 0;
for (GrCCGeometry::Verb verb : geometry.verbs()) {
if (GrCCGeometry::Verb::kBeginContour == verb ||
GrCCGeometry::Verb::kEndOpenContour == verb ||
GrCCGeometry::Verb::kEndClosedContour == verb) {
continue;
}
if (GrCCGeometry::Verb::kLineTo == verb) {
++ptsIdx;
continue;
}
SkASSERT(GrCCGeometry::Verb::kMonotonicQuadraticTo == verb ||
GrCCGeometry::Verb::kMonotonicConicTo == verb);
if (PrimitiveType::kQuadratics == fPrimitiveType &&
GrCCGeometry::Verb::kMonotonicQuadraticTo == verb) {
fTriPointInstances.push_back().set(&geometry.points()[ptsIdx], Sk2f(0, 0));
} else if (PrimitiveType::kConics == fPrimitiveType &&
GrCCGeometry::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));
}
}
void CCPRGeometryView::DrawCoverageCountOp::onExecute(GrOpFlushState* state) {
GrResourceProvider* rp = state->resourceProvider();
GrContext* context = state->gpu()->getContext();
GrGLGpu* glGpu = kOpenGL_GrBackend == context->contextPriv().getBackend()
? static_cast<GrGLGpu*>(state->gpu())
: nullptr;
GrCCCoverageProcessor proc(rp, fView->fPrimitiveType);
SkDEBUGCODE(proc.enableDebugBloat(kDebugBloat));
SkSTArray<1, GrMesh> mesh;
if (PrimitiveType::kCubics == fView->fPrimitiveType ||
PrimitiveType::kConics == fView->fPrimitiveType) {
sk_sp<GrBuffer> instBuff(rp->createBuffer(
fView->fQuadPointInstances.count() * sizeof(QuadPointInstance),
kVertex_GrBufferType, kDynamic_GrAccessPattern,
GrResourceProvider::kNoPendingIO_Flag | GrResourceProvider::kRequireGpuMemory_Flag,
fView->fQuadPointInstances.begin()));
if (!fView->fQuadPointInstances.empty() && instBuff) {
proc.appendMesh(instBuff.get(), fView->fQuadPointInstances.count(), 0, &mesh);
}
} else {
sk_sp<GrBuffer> instBuff(rp->createBuffer(
fView->fTriPointInstances.count() * sizeof(TriPointInstance), kVertex_GrBufferType,
kDynamic_GrAccessPattern,
GrResourceProvider::kNoPendingIO_Flag | GrResourceProvider::kRequireGpuMemory_Flag,
fView->fTriPointInstances.begin()));
if (!fView->fTriPointInstances.empty() && instBuff) {
proc.appendMesh(instBuff.get(), fView->fTriPointInstances.count(), 0, &mesh);
}
}
GrPipeline pipeline(state->drawOpArgs().fProxy, GrPipeline::ScissorState::kDisabled,
SkBlendMode::kPlus);
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));
}
if (!mesh.empty()) {
SkASSERT(1 == mesh.count());
proc.draw(state, pipeline, nullptr, mesh.begin(), 1, this->bounds());
}
if (glGpu) {
context->resetContext(kMisc_GrGLBackendState);
}
}
class CCPRGeometryView::Click : public SampleView::Click {
public:
Click(SkView* target, int ptIdx) : SampleView::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;
};
SkView::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(SampleView::Click* click) {
Click* myClick = (Click*)click;
myClick->doClick(fPoints);
this->updateAndInval();
return true;
}
bool CCPRGeometryView::onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "CCPRGeometry");
return true;
}
SkUnichar unichar;
if (SampleCode::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;
}
if (PrimitiveType::kConics == fPrimitiveType) {
if (unichar == '+') {
fConicWeight *= 2;
this->updateAndInval();
return true;
}
if (unichar == '+' || unichar == '=') {
fConicWeight *= 5/4.f;
this->updateAndInval();
return true;
}
if (unichar == '-') {
fConicWeight *= 4/5.f;
this->updateAndInval();
return true;
}
if (unichar == '_') {
fConicWeight *= .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;
}
}
return this->INHERITED::onQuery(evt);
}
DEF_SAMPLE(return new CCPRGeometryView;)
#endif // SK_SUPPORT_GPU
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