Brian Salomon | 04aef10 | 2021-01-23 11:41:54 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2021 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 | #include "gm/gm.h" |
| 9 | #include "include/core/SkCanvas.h" |
| 10 | #include "include/core/SkSize.h" |
| 11 | #include "include/core/SkString.h" |
| 12 | #include "include/core/SkSurface.h" |
| 13 | #include "include/effects/SkGradientShader.h" |
| 14 | #include "include/effects/SkRuntimeEffect.h" |
| 15 | #include "tools/Resources.h" |
| 16 | #include "tools/ToolUtils.h" |
| 17 | |
| 18 | class RuntimeEffectImage : public skiagm::GM { |
| 19 | public: |
| 20 | RuntimeEffectImage() = default; |
| 21 | |
| 22 | SkString onShortName() override { return SkString("runtime_effect_image"); } |
| 23 | |
| 24 | SkISize onISize() override { return {800, 200}; } |
| 25 | |
| 26 | protected: |
| 27 | void onOnceBeforeDraw() override { |
| 28 | SkString sksl(R"( |
| 29 | uniform shader child; |
| 30 | uniform half gAlphaType; // 0 is premul, non-zero unpremul. |
| 31 | |
| 32 | half4 main(float2 p) { |
| 33 | half r = fract(p.x/20); |
| 34 | half g = fract(p.y/20); |
| 35 | half b = fract((p.x + 5)/10); |
| 36 | half a = min(distance(p, vec2(50, 50))/50 + 0.3, 1); |
| 37 | half4 result = half4(r, g, b, a); |
Brian Osman | cbfa34a | 2021-09-02 09:26:27 -0400 | [diff] [blame] | 38 | result *= child.eval(p); |
Brian Salomon | 04aef10 | 2021-01-23 11:41:54 -0500 | [diff] [blame] | 39 | if (gAlphaType == 0) { |
| 40 | result.rgb *= a; |
| 41 | } |
| 42 | return result; |
| 43 | } |
| 44 | )"); |
Brian Osman | f6123f1 | 2021-04-15 13:52:43 -0400 | [diff] [blame] | 45 | auto [effect, error] = SkRuntimeEffect::MakeForShader(sksl); |
Brian Salomon | 04aef10 | 2021-01-23 11:41:54 -0500 | [diff] [blame] | 46 | if (!effect) { |
| 47 | SkDebugf("RuntimeShader error: %s\n", error.c_str()); |
| 48 | } |
| 49 | fEffect = std::move(effect); |
| 50 | } |
| 51 | |
| 52 | DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override { |
| 53 | GrRecordingContext* rc = canvas->recordingContext(); |
| 54 | SkRuntimeShaderBuilder builder(fEffect); |
| 55 | SkImageInfo info = SkImageInfo::Make(100, 100, kRGBA_8888_SkColorType, kPremul_SkAlphaType); |
| 56 | |
| 57 | SkSamplingOptions nn{SkFilterMode::kNearest}; |
| 58 | SkSamplingOptions mm{SkFilterMode::kLinear, SkMipmapMode::kNearest}; |
| 59 | auto whiteShader = SkShaders::Color(SK_ColorWHITE); |
| 60 | auto imageForShader = GetResourceAsImage("images/ducky.jpg"); |
| 61 | if (!imageForShader) { |
| 62 | *errorMsg = "Could not load image"; |
| 63 | return DrawResult::kFail; |
| 64 | } |
| 65 | auto imageShader = imageForShader->makeShader(SkTileMode::kRepeat, |
| 66 | SkTileMode::kRepeat, |
| 67 | SkSamplingOptions(SkFilterMode::kLinear), |
| 68 | SkMatrix::Scale(0.2f, 0.2f)); |
| 69 | |
| 70 | builder.uniform("gAlphaType") = 0.f; |
| 71 | builder.child("child") = whiteShader; |
| 72 | ToolUtils::draw_checkerboard(canvas, SK_ColorWHITE, SK_ColorLTGRAY, 50); |
| 73 | canvas->translate(5, 5); |
| 74 | SkPaint aaPaint; |
| 75 | aaPaint.setAntiAlias(true); |
| 76 | for (const auto& vm : {SkMatrix::Scale(1.5f, 1.5f), SkMatrix::Scale(0.3f, 0.3f)}) { |
| 77 | canvas->save(); |
| 78 | canvas->concat(vm); |
| 79 | |
| 80 | sk_sp<SkImage> image; |
| 81 | |
| 82 | // basic |
| 83 | image = builder.makeImage(rc, nullptr, info, false); |
| 84 | canvas->drawImage(image, 0, 0, nn, &aaPaint); |
| 85 | canvas->translate(105, 0); |
| 86 | |
| 87 | // local matrix |
| 88 | SkMatrix lm = SkMatrix::RotateDeg(45, {50, 50}); |
| 89 | lm.preTranslate(10, 10); |
| 90 | image = builder.makeImage(rc, &lm, info, false); |
| 91 | canvas->drawImage(image, 0, 0, nn, &aaPaint); |
| 92 | canvas->translate(105, 0); |
| 93 | |
| 94 | // unpremul |
| 95 | if (rc) { |
| 96 | // use a uniform to make the effect output be unpremul so it looks the same as the |
| 97 | // premul case when drawn to the canvas. |
| 98 | builder.uniform("gAlphaType") = 1.f; |
| 99 | image = builder.makeImage(rc, |
| 100 | nullptr, |
| 101 | info.makeAlphaType(kUnpremul_SkAlphaType), |
| 102 | false); |
| 103 | builder.uniform("gAlphaType") = 0.f; |
| 104 | canvas->drawImage(image, 0, 0, nn, &aaPaint); |
| 105 | canvas->translate(105, 0); |
| 106 | } else { |
| 107 | // CPU doesn't yet support making kUnpremul images. Just draw the basic one again. |
| 108 | image = builder.makeImage(nullptr, nullptr, info, false); |
| 109 | canvas->drawImage(image, 0, 0, nn, &aaPaint); |
| 110 | canvas->translate(105, 0); |
| 111 | } |
| 112 | |
| 113 | // color space |
| 114 | sk_sp<SkColorSpace> cs = SkColorSpace::MakeSRGB()->makeColorSpin(); |
| 115 | image = builder.makeImage(rc, nullptr, info.makeColorSpace(std::move(cs)), false); |
| 116 | canvas->drawImage(image, 0, 0, nn, &aaPaint); |
| 117 | canvas->translate(105, 0); |
| 118 | |
| 119 | // mipmapped and different child |
| 120 | builder.child("child") = imageShader; |
| 121 | image = builder.makeImage(rc, nullptr, info, true); |
| 122 | builder.child("child") = whiteShader; |
| 123 | canvas->drawImage(image, 0, 0, mm, &aaPaint); |
| 124 | canvas->translate(105, 0); |
| 125 | |
| 126 | canvas->restore(); |
| 127 | canvas->translate(0, 105*vm.getScaleY()); |
| 128 | } |
| 129 | return DrawResult::kOk; |
| 130 | } |
| 131 | |
| 132 | private: |
| 133 | sk_sp<SkRuntimeEffect> fEffect; |
| 134 | }; |
| 135 | DEF_GM(return new RuntimeEffectImage;) |