103 lines
3.7 KiB
C++
103 lines
3.7 KiB
C++
/*
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* Copyright 2021 Google LLC
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#if !defined(SK_BUILD_FOR_GOOGLE3) // Google3 doesn't build particles module
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "modules/particles/include/SkParticleEffect.h"
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#include "modules/particles/include/SkParticleSerialization.h"
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#include "modules/skresources/include/SkResources.h"
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#include "src/sksl/codegen/SkSLVMCodeGenerator.h"
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#include "tools/Resources.h"
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struct UniformValue {
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const char* fName;
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std::vector<float> fData;
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};
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class ParticlesGM : public skiagm::GM {
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public:
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ParticlesGM(const char* name,
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double startTime,
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SkISize size,
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SkPoint origin,
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std::vector<UniformValue> uniforms = {})
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: GM(SK_ColorBLACK)
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, fName(name)
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, fStartTime(startTime)
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, fSize(size)
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, fOrigin(origin)
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, fUniforms(std::move(uniforms)) {}
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SkString onShortName() override { return SkStringPrintf("particles_%s", fName); }
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SkISize onISize() override { return fSize; }
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void onOnceBeforeDraw() override {
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SkParticleEffect::RegisterParticleTypes();
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auto jsonData = GetResourceAsData(SkStringPrintf("particles/%s.json", fName).c_str());
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skjson::DOM dom(static_cast<const char*>(jsonData->data()), jsonData->size());
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SkFromJsonVisitor fromJson(dom.root());
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auto resourceProvider = skresources::FileResourceProvider::Make(GetResourcePath());
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auto effectParams = sk_make_sp<SkParticleEffectParams>();
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effectParams->visitFields(&fromJson);
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effectParams->prepare(resourceProvider.get());
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fEffect = sk_make_sp<SkParticleEffect>(effectParams);
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for (const auto& val : fUniforms) {
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SkAssertResult(fEffect->setUniform(val.fName, val.fData.data(), val.fData.size()));
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}
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fEffect->start(/*now=*/0.0, /*looping=*/true);
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// Fast-forward (in 30 fps time-slices) to the requested time
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for (double time = 0; time < fStartTime; time += 1.0 / 30) {
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fEffect->update(/*now=*/std::min(time, fStartTime));
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}
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}
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bool onAnimate(double nanos) override {
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if (fEffect) {
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fEffect->update(fStartTime + (nanos * 1E-9));
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}
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return true;
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}
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void onDraw(SkCanvas* canvas) override {
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canvas->save();
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canvas->translate(fOrigin.fX, fOrigin.fY);
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fEffect->draw(canvas);
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canvas->restore();
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}
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protected:
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const char* fName;
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const double fStartTime;
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const SkISize fSize;
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const SkPoint fOrigin;
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sk_sp<SkParticleEffect> fEffect;
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std::vector<UniformValue> fUniforms;
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};
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DEF_GM(return new ParticlesGM("confetti", 1.0, {400, 400}, {200, 200});)
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DEF_GM(return new ParticlesGM("cube", 1.0, {400, 400}, {200, 200});)
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DEF_GM(return new ParticlesGM("curves", 4.0, {100, 200}, { 50, 190});)
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DEF_GM(return new ParticlesGM("mandrill", 1.0, {250, 250}, { 25, 25});)
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DEF_GM(return new ParticlesGM("spiral", 2.0, {250, 250}, {125, 125});)
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DEF_GM(return new ParticlesGM("sprite_frame", 1.0, {200, 200}, {100, 100});)
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DEF_GM(return new ParticlesGM("text", 1.0, {250, 110}, { 10, 100});)
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DEF_GM(return new ParticlesGM("uniforms", 2.0, {250, 250}, {125, 125},
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{{"rate", {2.0f}},
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{"spin", {4.0f}},
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{"color", {0.25f, 0.75f, 0.75f}}});)
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#endif // SK_BUILD_FOR_GOOGLE3
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