Brian Osman | 7c979f5 | 2019-02-12 13:27:51 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2019 Google LLC |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #ifndef SkParticleEffect_DEFINED |
| 9 | #define SkParticleEffect_DEFINED |
| 10 | |
| 11 | #include "SkAutoMalloc.h" |
| 12 | #include "SkColor.h" |
| 13 | #include "SkCurve.h" |
| 14 | #include "SkParticleData.h" |
| 15 | #include "SkRandom.h" |
| 16 | #include "SkRect.h" |
| 17 | #include "SkRefCnt.h" |
| 18 | #include "SkString.h" |
| 19 | #include "SkTArray.h" |
| 20 | |
| 21 | class SkAnimTimer; |
| 22 | class SkCanvas; |
| 23 | class SkFieldVisitor; |
| 24 | class SkImage; |
| 25 | class SkParticleAffector; |
| 26 | class SkParticleEmitter; |
| 27 | struct SkRSXform; |
| 28 | |
Brian Osman | 7c979f5 | 2019-02-12 13:27:51 -0500 | [diff] [blame] | 29 | class SkParticleEffectParams : public SkRefCnt { |
| 30 | public: |
Brian Osman | 8b6283f | 2019-02-14 16:55:21 -0500 | [diff] [blame^] | 31 | int fMaxCount = 128; |
| 32 | float fEffectDuration = 1.0f; |
| 33 | float fRate = 8.0f; |
| 34 | SkCurve fLifetime = 1.0f; |
| 35 | SkColor4f fStartColor = { 1.0f, 1.0f, 1.0f, 1.0f }; |
| 36 | SkColor4f fEndColor = { 1.0f, 1.0f, 1.0f, 1.0f }; |
Brian Osman | 7c979f5 | 2019-02-12 13:27:51 -0500 | [diff] [blame] | 37 | |
| 38 | // Sprite image parameters |
| 39 | // TODO: Move sprite stuff in here, out of effect |
| 40 | SkString fImage; |
| 41 | int fImageCols = 1; |
| 42 | int fImageRows = 1; |
| 43 | |
| 44 | // Emitter shape & parameters |
| 45 | sk_sp<SkParticleEmitter> fEmitter; |
| 46 | |
Brian Osman | 5c1f8eb | 2019-02-14 14:49:55 -0500 | [diff] [blame] | 47 | // Rules that configure particles at spawn time |
| 48 | SkTArray<sk_sp<SkParticleAffector>> fSpawnAffectors; |
| 49 | |
| 50 | // Rules that update existing particles over their lifetime |
| 51 | SkTArray<sk_sp<SkParticleAffector>> fUpdateAffectors; |
Brian Osman | 7c979f5 | 2019-02-12 13:27:51 -0500 | [diff] [blame] | 52 | |
| 53 | void visitFields(SkFieldVisitor* v); |
| 54 | }; |
| 55 | |
| 56 | class SkParticleEffect : public SkRefCnt { |
| 57 | public: |
Brian Osman | 5c1f8eb | 2019-02-14 14:49:55 -0500 | [diff] [blame] | 58 | SkParticleEffect(sk_sp<SkParticleEffectParams> params, const SkRandom& random); |
Brian Osman | 7c979f5 | 2019-02-12 13:27:51 -0500 | [diff] [blame] | 59 | |
Brian Osman | 5c1f8eb | 2019-02-14 14:49:55 -0500 | [diff] [blame] | 60 | void start(const SkAnimTimer& timer, bool looping = false); |
| 61 | void update(const SkAnimTimer& timer); |
Brian Osman | 7c979f5 | 2019-02-12 13:27:51 -0500 | [diff] [blame] | 62 | void draw(SkCanvas* canvas); |
| 63 | |
Brian Osman | 5c1f8eb | 2019-02-14 14:49:55 -0500 | [diff] [blame] | 64 | bool isAlive() { return fSpawnTime >= 0; } |
| 65 | |
Brian Osman | 7c979f5 | 2019-02-12 13:27:51 -0500 | [diff] [blame] | 66 | SkParticleEffectParams* getParams() { return fParams.get(); } |
| 67 | |
| 68 | private: |
| 69 | void setCapacity(int capacity); |
| 70 | |
| 71 | int spriteCount() const { return fParams->fImageCols * fParams->fImageRows; } |
| 72 | SkRect spriteRect(int i) const { |
| 73 | SkASSERT(i >= 0 && i < this->spriteCount()); |
| 74 | int row = i / fParams->fImageCols; |
| 75 | int col = i % fParams->fImageCols; |
| 76 | return fImageRect.makeOffset(col * fImageRect.width(), row * fImageRect.height()); |
| 77 | } |
| 78 | SkPoint spriteCenter() const { |
| 79 | return { fImageRect.width() * 0.5f, fImageRect.height() * 0.5f }; |
| 80 | } |
| 81 | |
| 82 | struct Particle { |
| 83 | double fTimeOfBirth; |
| 84 | double fTimeOfDeath; |
| 85 | SkRandom fStableRandom; |
| 86 | |
| 87 | // Texture coord rects and colors are stored in parallel arrays for drawAtlas. |
| 88 | SkParticlePoseAndVelocity fPV; |
| 89 | }; |
| 90 | |
| 91 | sk_sp<SkParticleEffectParams> fParams; |
| 92 | sk_sp<SkImage> fImage; |
| 93 | SkRect fImageRect; |
| 94 | |
Brian Osman | 5c1f8eb | 2019-02-14 14:49:55 -0500 | [diff] [blame] | 95 | SkRandom fRandom; |
| 96 | |
| 97 | bool fLooping; |
| 98 | double fSpawnTime; |
| 99 | |
Brian Osman | 7c979f5 | 2019-02-12 13:27:51 -0500 | [diff] [blame] | 100 | int fCount; |
| 101 | double fLastTime; |
| 102 | float fSpawnRemainder; |
| 103 | |
| 104 | SkAutoTMalloc<Particle> fParticles; |
| 105 | SkAutoTMalloc<SkRSXform> fXforms; |
| 106 | SkAutoTMalloc<SkRect> fSpriteRects; |
| 107 | SkAutoTMalloc<SkColor> fColors; |
| 108 | |
| 109 | // Cached |
| 110 | int fCapacity; |
| 111 | }; |
| 112 | |
| 113 | #endif // SkParticleEffect_DEFINED |