Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [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 | #include "gm/gm.h" |
| 9 | #include "include/core/SkCanvas.h" |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 10 | #include "include/core/SkData.h" |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 11 | #include "include/core/SkPaint.h" |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 12 | #include "include/core/SkRRect.h" |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 13 | #include "include/core/SkSize.h" |
| 14 | #include "include/core/SkString.h" |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 15 | #include "include/core/SkSurface.h" |
| 16 | #include "include/effects/SkGradientShader.h" |
Mike Reed | 146722e | 2020-02-13 12:36:28 -0500 | [diff] [blame] | 17 | #include "include/effects/SkImageFilters.h" |
Brian Osman | ee426f2 | 2020-01-02 11:55:24 -0500 | [diff] [blame] | 18 | #include "include/effects/SkRuntimeEffect.h" |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 19 | #include "include/utils/SkRandom.h" |
Brian Osman | 2f2977e | 2021-12-07 16:05:39 -0500 | [diff] [blame] | 20 | #include "src/core/SkColorSpacePriv.h" |
Mike Reed | 146722e | 2020-02-13 12:36:28 -0500 | [diff] [blame] | 21 | #include "tools/Resources.h" |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 22 | |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 23 | enum RT_Flags { |
Brian Osman | 6285d64 | 2021-05-05 08:24:03 -0400 | [diff] [blame] | 24 | kAnimate_RTFlag = 0x1, |
| 25 | kBench_RTFlag = 0x2, |
| 26 | kColorFilter_RTFlag = 0x4, |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 27 | }; |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 28 | |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 29 | class RuntimeShaderGM : public skiagm::GM { |
| 30 | public: |
| 31 | RuntimeShaderGM(const char* name, SkISize size, const char* sksl, uint32_t flags = 0) |
| 32 | : fName(name), fSize(size), fFlags(flags), fSkSL(sksl) {} |
| 33 | |
| 34 | void onOnceBeforeDraw() override { |
Brian Osman | 6285d64 | 2021-05-05 08:24:03 -0400 | [diff] [blame] | 35 | auto [effect, error] = (fFlags & kColorFilter_RTFlag) |
| 36 | ? SkRuntimeEffect::MakeForColorFilter(fSkSL) |
| 37 | : SkRuntimeEffect::MakeForShader(fSkSL); |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 38 | if (!effect) { |
| 39 | SkDebugf("RuntimeShader error: %s\n", error.c_str()); |
| 40 | } |
| 41 | fEffect = std::move(effect); |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 42 | } |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 43 | |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 44 | bool runAsBench() const override { return SkToBool(fFlags & kBench_RTFlag); } |
| 45 | SkString onShortName() override { return fName; } |
| 46 | SkISize onISize() override { return fSize; } |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 47 | |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 48 | bool onAnimate(double nanos) override { |
| 49 | fSecs = nanos / (1000 * 1000 * 1000); |
| 50 | return SkToBool(fFlags & kAnimate_RTFlag); |
| 51 | } |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 52 | |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 53 | protected: |
| 54 | SkString fName; |
| 55 | SkISize fSize; |
| 56 | uint32_t fFlags; |
| 57 | float fSecs = 0.0f; |
| 58 | |
| 59 | SkString fSkSL; |
| 60 | sk_sp<SkRuntimeEffect> fEffect; |
| 61 | }; |
| 62 | |
| 63 | class SimpleRT : public RuntimeShaderGM { |
| 64 | public: |
| 65 | SimpleRT() : RuntimeShaderGM("runtime_shader", {512, 256}, R"( |
| 66 | uniform half4 gColor; |
| 67 | |
Brian Osman | 767f444 | 2020-08-13 16:59:48 -0400 | [diff] [blame] | 68 | half4 main(float2 p) { |
Brian Osman | b25e6e1 | 2020-09-14 14:44:42 -0400 | [diff] [blame] | 69 | return half4(p*(1.0/255), gColor.b, 1); |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 70 | } |
| 71 | )", kBench_RTFlag) {} |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 72 | |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 73 | void onDraw(SkCanvas* canvas) override { |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 74 | SkRuntimeShaderBuilder builder(fEffect); |
Brian Osman | 93de162 | 2019-12-26 08:43:05 -0500 | [diff] [blame] | 75 | |
| 76 | SkMatrix localM; |
| 77 | localM.setRotate(90, 128, 128); |
Brian Osman | a4b9169 | 2020-08-10 14:26:16 -0400 | [diff] [blame] | 78 | builder.uniform("gColor") = SkColor4f{1, 0, 0, 1}; |
Brian Osman | 93de162 | 2019-12-26 08:43:05 -0500 | [diff] [blame] | 79 | |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 80 | SkPaint p; |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 81 | p.setShader(builder.makeShader(&localM)); |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 82 | canvas->drawRect({0, 0, 256, 256}, p); |
| 83 | } |
Mike Reed | 3fd3cc9 | 2019-06-20 12:40:30 -0400 | [diff] [blame] | 84 | }; |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 85 | DEF_GM(return new SimpleRT;) |
Mike Reed | 146722e | 2020-02-13 12:36:28 -0500 | [diff] [blame] | 86 | |
| 87 | static sk_sp<SkShader> make_shader(sk_sp<SkImage> img, SkISize size) { |
Mike Reed | 1f60733 | 2020-05-21 12:11:27 -0400 | [diff] [blame] | 88 | SkMatrix scale = SkMatrix::Scale(size.width() / (float)img->width(), |
| 89 | size.height() / (float)img->height()); |
Mike Reed | 4106819 | 2020-12-09 21:48:52 -0500 | [diff] [blame] | 90 | return img->makeShader(SkSamplingOptions(), scale); |
Mike Reed | 146722e | 2020-02-13 12:36:28 -0500 | [diff] [blame] | 91 | } |
| 92 | |
Mike Reed | 146722e | 2020-02-13 12:36:28 -0500 | [diff] [blame] | 93 | static sk_sp<SkShader> make_threshold(SkISize size) { |
| 94 | auto info = SkImageInfo::Make(size.width(), size.height(), kAlpha_8_SkColorType, |
| 95 | kPremul_SkAlphaType); |
| 96 | auto surf = SkSurface::MakeRaster(info); |
| 97 | auto canvas = surf->getCanvas(); |
| 98 | |
| 99 | const SkScalar rad = 50; |
| 100 | SkColor colors[] = {SK_ColorBLACK, 0}; |
| 101 | SkPaint paint; |
| 102 | paint.setAntiAlias(true); |
| 103 | paint.setShader(SkGradientShader::MakeRadial({0,0}, rad, colors, nullptr, 2, SkTileMode::kClamp)); |
| 104 | |
| 105 | SkPaint layerPaint; |
| 106 | const SkScalar sigma = 16.0f; |
| 107 | layerPaint.setImageFilter(SkImageFilters::Blur(sigma, sigma, nullptr)); |
| 108 | canvas->saveLayer(nullptr, &layerPaint); |
| 109 | |
| 110 | SkRandom rand; |
| 111 | for (int i = 0; i < 25; ++i) { |
| 112 | SkScalar x = rand.nextF() * size.width(); |
| 113 | SkScalar y = rand.nextF() * size.height(); |
| 114 | canvas->save(); |
| 115 | canvas->translate(x, y); |
| 116 | canvas->drawCircle(0, 0, rad, paint); |
| 117 | canvas->restore(); |
| 118 | } |
| 119 | |
| 120 | canvas->restore(); // apply the blur |
| 121 | |
Mike Reed | 4106819 | 2020-12-09 21:48:52 -0500 | [diff] [blame] | 122 | return surf->makeImageSnapshot()->makeShader(SkSamplingOptions()); |
Mike Reed | 146722e | 2020-02-13 12:36:28 -0500 | [diff] [blame] | 123 | } |
| 124 | |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 125 | class ThresholdRT : public RuntimeShaderGM { |
| 126 | public: |
| 127 | ThresholdRT() : RuntimeShaderGM("threshold_rt", {256, 256}, R"( |
Brian Osman | 91292e9 | 2020-11-04 15:40:50 -0500 | [diff] [blame] | 128 | uniform shader before_map; |
| 129 | uniform shader after_map; |
| 130 | uniform shader threshold_map; |
Mike Reed | 146722e | 2020-02-13 12:36:28 -0500 | [diff] [blame] | 131 | |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 132 | uniform float cutoff; |
| 133 | uniform float slope; |
| 134 | |
| 135 | float smooth_cutoff(float x) { |
| 136 | x = x * slope + (0.5 - slope * cutoff); |
| 137 | return clamp(x, 0, 1); |
| 138 | } |
| 139 | |
Brian Osman | 767f444 | 2020-08-13 16:59:48 -0400 | [diff] [blame] | 140 | half4 main(float2 xy) { |
Brian Osman | cbfa34a | 2021-09-02 09:26:27 -0400 | [diff] [blame] | 141 | half4 before = before_map.eval(xy); |
| 142 | half4 after = after_map.eval(xy); |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 143 | |
Brian Osman | cbfa34a | 2021-09-02 09:26:27 -0400 | [diff] [blame] | 144 | float m = smooth_cutoff(threshold_map.eval(xy).a); |
Brian Osman | b25e6e1 | 2020-09-14 14:44:42 -0400 | [diff] [blame] | 145 | return mix(before, after, m); |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 146 | } |
| 147 | )", kAnimate_RTFlag | kBench_RTFlag) {} |
| 148 | |
| 149 | sk_sp<SkShader> fBefore, fAfter, fThreshold; |
Mike Reed | 146722e | 2020-02-13 12:36:28 -0500 | [diff] [blame] | 150 | |
| 151 | void onOnceBeforeDraw() override { |
| 152 | const SkISize size = {256, 256}; |
| 153 | fThreshold = make_threshold(size); |
| 154 | fBefore = make_shader(GetResourceAsImage("images/mandrill_256.png"), size); |
| 155 | fAfter = make_shader(GetResourceAsImage("images/dog.jpg"), size); |
| 156 | |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 157 | this->RuntimeShaderGM::onOnceBeforeDraw(); |
Mike Reed | 146722e | 2020-02-13 12:36:28 -0500 | [diff] [blame] | 158 | } |
| 159 | |
Mike Klein | f8d68fe | 2020-06-18 10:01:31 -0500 | [diff] [blame] | 160 | void onDraw(SkCanvas* canvas) override { |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 161 | SkRuntimeShaderBuilder builder(fEffect); |
| 162 | |
Brian Osman | a4b9169 | 2020-08-10 14:26:16 -0400 | [diff] [blame] | 163 | builder.uniform("cutoff") = sin(fSecs) * 0.55f + 0.5f; |
| 164 | builder.uniform("slope") = 10.0f; |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 165 | |
| 166 | builder.child("before_map") = fBefore; |
| 167 | builder.child("after_map") = fAfter; |
| 168 | builder.child("threshold_map") = fThreshold; |
Mike Reed | 146722e | 2020-02-13 12:36:28 -0500 | [diff] [blame] | 169 | |
| 170 | SkPaint paint; |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 171 | paint.setShader(builder.makeShader()); |
Mike Reed | 146722e | 2020-02-13 12:36:28 -0500 | [diff] [blame] | 172 | canvas->drawRect({0, 0, 256, 256}, paint); |
| 173 | |
| 174 | auto draw = [&](SkScalar x, SkScalar y, sk_sp<SkShader> shader) { |
| 175 | paint.setShader(shader); |
| 176 | canvas->save(); |
| 177 | canvas->translate(x, y); |
| 178 | canvas->drawRect({0, 0, 256, 256}, paint); |
| 179 | canvas->restore(); |
| 180 | }; |
| 181 | draw(256, 0, fThreshold); |
| 182 | draw( 0, 256, fBefore); |
| 183 | draw(256, 256, fAfter); |
Mike Reed | 146722e | 2020-02-13 12:36:28 -0500 | [diff] [blame] | 184 | } |
Mike Reed | 146722e | 2020-02-13 12:36:28 -0500 | [diff] [blame] | 185 | }; |
| 186 | DEF_GM(return new ThresholdRT;) |
Mike Reed | 8520e76 | 2020-04-30 12:06:23 -0400 | [diff] [blame] | 187 | |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 188 | class SpiralRT : public RuntimeShaderGM { |
| 189 | public: |
| 190 | SpiralRT() : RuntimeShaderGM("spiral_rt", {512, 512}, R"( |
| 191 | uniform float rad_scale; |
| 192 | uniform float2 in_center; |
Brian Osman | 8c3d183 | 2021-12-06 10:30:51 -0500 | [diff] [blame] | 193 | layout(color) uniform float4 in_colors0; |
| 194 | layout(color) uniform float4 in_colors1; |
Mike Reed | 8520e76 | 2020-04-30 12:06:23 -0400 | [diff] [blame] | 195 | |
Brian Osman | 767f444 | 2020-08-13 16:59:48 -0400 | [diff] [blame] | 196 | half4 main(float2 p) { |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 197 | float2 pp = p - in_center; |
| 198 | float radius = length(pp); |
| 199 | radius = sqrt(radius); |
| 200 | float angle = atan(pp.y / pp.x); |
| 201 | float t = (angle + 3.1415926/2) / (3.1415926); |
| 202 | t += radius * rad_scale; |
| 203 | t = fract(t); |
Brian Osman | b25e6e1 | 2020-09-14 14:44:42 -0400 | [diff] [blame] | 204 | return in_colors0 * (1-t) + in_colors1 * t; |
Mike Reed | 8520e76 | 2020-04-30 12:06:23 -0400 | [diff] [blame] | 205 | } |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 206 | )", kAnimate_RTFlag | kBench_RTFlag) {} |
Mike Reed | 8520e76 | 2020-04-30 12:06:23 -0400 | [diff] [blame] | 207 | |
| 208 | void onDraw(SkCanvas* canvas) override { |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 209 | SkRuntimeShaderBuilder builder(fEffect); |
| 210 | |
Brian Osman | a4b9169 | 2020-08-10 14:26:16 -0400 | [diff] [blame] | 211 | builder.uniform("rad_scale") = std::sin(fSecs * 0.5f + 2.0f) / 5; |
| 212 | builder.uniform("in_center") = SkV2{256, 256}; |
Brian Osman | 8c3d183 | 2021-12-06 10:30:51 -0500 | [diff] [blame] | 213 | builder.uniform("in_colors0") = SkColors::kRed; |
| 214 | builder.uniform("in_colors1") = SkColors::kGreen; |
Mike Reed | 8520e76 | 2020-04-30 12:06:23 -0400 | [diff] [blame] | 215 | |
| 216 | SkPaint paint; |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 217 | paint.setShader(builder.makeShader()); |
Mike Reed | 8520e76 | 2020-04-30 12:06:23 -0400 | [diff] [blame] | 218 | canvas->drawRect({0, 0, 512, 512}, paint); |
| 219 | } |
Mike Reed | 8520e76 | 2020-04-30 12:06:23 -0400 | [diff] [blame] | 220 | }; |
| 221 | DEF_GM(return new SpiralRT;) |
Brian Osman | 9c3eccd | 2020-05-21 16:41:43 -0400 | [diff] [blame] | 222 | |
Brian Osman | 827dab4 | 2021-04-26 17:02:57 -0400 | [diff] [blame] | 223 | // Test case for sampling with both unmodified input coordinates, and explicit coordinates. |
| 224 | // The first version of skbug.com/11869 suffered a bug where all samples of a child were treated |
| 225 | // as pass-through if *at least one* used the unmodified coordinates. This was detected & tracked |
| 226 | // in b/181092919. This GM is similar, and demonstrates the bug before the fix was applied. |
| 227 | class UnsharpRT : public RuntimeShaderGM { |
| 228 | public: |
| 229 | UnsharpRT() : RuntimeShaderGM("unsharp_rt", {512, 256}, R"( |
John Stiles | 67f443b | 2021-09-30 12:45:36 -0400 | [diff] [blame] | 230 | uniform shader child; |
Brian Osman | 827dab4 | 2021-04-26 17:02:57 -0400 | [diff] [blame] | 231 | half4 main(float2 xy) { |
John Stiles | 67f443b | 2021-09-30 12:45:36 -0400 | [diff] [blame] | 232 | half4 c = child.eval(xy) * 5; |
| 233 | c -= child.eval(xy + float2( 1, 0)); |
| 234 | c -= child.eval(xy + float2(-1, 0)); |
| 235 | c -= child.eval(xy + float2( 0, 1)); |
| 236 | c -= child.eval(xy + float2( 0, -1)); |
Brian Osman | 827dab4 | 2021-04-26 17:02:57 -0400 | [diff] [blame] | 237 | return c; |
| 238 | } |
| 239 | )") {} |
| 240 | |
| 241 | sk_sp<SkImage> fMandrill; |
| 242 | |
| 243 | void onOnceBeforeDraw() override { |
| 244 | fMandrill = GetResourceAsImage("images/mandrill_256.png"); |
| 245 | this->RuntimeShaderGM::onOnceBeforeDraw(); |
| 246 | } |
| 247 | |
| 248 | void onDraw(SkCanvas* canvas) override { |
| 249 | // First we draw the unmodified image |
| 250 | canvas->drawImage(fMandrill, 0, 0); |
| 251 | |
| 252 | // Now draw the image with our unsharp mask applied |
| 253 | SkRuntimeShaderBuilder builder(fEffect); |
| 254 | const SkSamplingOptions sampling(SkFilterMode::kNearest); |
John Stiles | 67f443b | 2021-09-30 12:45:36 -0400 | [diff] [blame] | 255 | builder.child("child") = fMandrill->makeShader(sampling); |
Brian Osman | 827dab4 | 2021-04-26 17:02:57 -0400 | [diff] [blame] | 256 | |
| 257 | SkPaint paint; |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 258 | paint.setShader(builder.makeShader()); |
Brian Osman | 827dab4 | 2021-04-26 17:02:57 -0400 | [diff] [blame] | 259 | canvas->translate(256, 0); |
| 260 | canvas->drawRect({ 0, 0, 256, 256 }, paint); |
| 261 | } |
| 262 | }; |
| 263 | DEF_GM(return new UnsharpRT;) |
| 264 | |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 265 | class ColorCubeRT : public RuntimeShaderGM { |
| 266 | public: |
| 267 | ColorCubeRT() : RuntimeShaderGM("color_cube_rt", {512, 512}, R"( |
John Stiles | 67f443b | 2021-09-30 12:45:36 -0400 | [diff] [blame] | 268 | uniform shader child; |
Brian Osman | 91292e9 | 2020-11-04 15:40:50 -0500 | [diff] [blame] | 269 | uniform shader color_cube; |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 270 | |
| 271 | uniform float rg_scale; |
| 272 | uniform float rg_bias; |
| 273 | uniform float b_scale; |
| 274 | uniform float inv_size; |
| 275 | |
Brian Osman | 767f444 | 2020-08-13 16:59:48 -0400 | [diff] [blame] | 276 | half4 main(float2 xy) { |
John Stiles | 67f443b | 2021-09-30 12:45:36 -0400 | [diff] [blame] | 277 | float4 c = unpremul(child.eval(xy)); |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 278 | |
| 279 | // Map to cube coords: |
| 280 | float3 cubeCoords = float3(c.rg * rg_scale + rg_bias, c.b * b_scale); |
| 281 | |
| 282 | // Compute slice coordinate |
| 283 | float2 coords1 = float2((floor(cubeCoords.b) + cubeCoords.r) * inv_size, cubeCoords.g); |
| 284 | float2 coords2 = float2(( ceil(cubeCoords.b) + cubeCoords.r) * inv_size, cubeCoords.g); |
| 285 | |
| 286 | // Two bilinear fetches, plus a manual lerp for the third axis: |
Brian Osman | cbfa34a | 2021-09-02 09:26:27 -0400 | [diff] [blame] | 287 | half4 color = mix(color_cube.eval(coords1), color_cube.eval(coords2), |
Brian Osman | b25e6e1 | 2020-09-14 14:44:42 -0400 | [diff] [blame] | 288 | fract(cubeCoords.b)); |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 289 | |
| 290 | // Premul again |
| 291 | color.rgb *= color.a; |
Brian Osman | 767f444 | 2020-08-13 16:59:48 -0400 | [diff] [blame] | 292 | |
| 293 | return color; |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 294 | } |
| 295 | )") {} |
| 296 | |
Brian Osman | 9c3eccd | 2020-05-21 16:41:43 -0400 | [diff] [blame] | 297 | sk_sp<SkImage> fMandrill, fMandrillSepia, fIdentityCube, fSepiaCube; |
Brian Osman | 9c3eccd | 2020-05-21 16:41:43 -0400 | [diff] [blame] | 298 | |
| 299 | void onOnceBeforeDraw() override { |
| 300 | fMandrill = GetResourceAsImage("images/mandrill_256.png"); |
| 301 | fMandrillSepia = GetResourceAsImage("images/mandrill_sepia.png"); |
| 302 | fIdentityCube = GetResourceAsImage("images/lut_identity.png"); |
| 303 | fSepiaCube = GetResourceAsImage("images/lut_sepia.png"); |
| 304 | |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 305 | this->RuntimeShaderGM::onOnceBeforeDraw(); |
Brian Osman | 9c3eccd | 2020-05-21 16:41:43 -0400 | [diff] [blame] | 306 | } |
| 307 | |
Brian Osman | 89bf734 | 2020-06-18 17:11:16 -0400 | [diff] [blame] | 308 | void onDraw(SkCanvas* canvas) override { |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 309 | SkRuntimeShaderBuilder builder(fEffect); |
| 310 | |
Brian Osman | 9c3eccd | 2020-05-21 16:41:43 -0400 | [diff] [blame] | 311 | // First we draw the unmodified image, and a copy that was sepia-toned in Photoshop: |
| 312 | canvas->drawImage(fMandrill, 0, 0); |
| 313 | canvas->drawImage(fMandrillSepia, 0, 256); |
| 314 | |
| 315 | // LUT dimensions should be (kSize^2, kSize) |
| 316 | constexpr float kSize = 16.0f; |
| 317 | |
Mike Reed | 5ec2238 | 2021-01-14 21:59:01 -0500 | [diff] [blame] | 318 | const SkSamplingOptions sampling(SkFilterMode::kLinear); |
Mike Reed | 4106819 | 2020-12-09 21:48:52 -0500 | [diff] [blame] | 319 | |
Brian Osman | a4b9169 | 2020-08-10 14:26:16 -0400 | [diff] [blame] | 320 | builder.uniform("rg_scale") = (kSize - 1) / kSize; |
| 321 | builder.uniform("rg_bias") = 0.5f / kSize; |
| 322 | builder.uniform("b_scale") = kSize - 1; |
| 323 | builder.uniform("inv_size") = 1.0f / kSize; |
Brian Osman | 2c28bf9 | 2020-05-28 13:38:24 -0400 | [diff] [blame] | 324 | |
John Stiles | 67f443b | 2021-09-30 12:45:36 -0400 | [diff] [blame] | 325 | builder.child("child") = fMandrill->makeShader(sampling); |
Brian Osman | 9c3eccd | 2020-05-21 16:41:43 -0400 | [diff] [blame] | 326 | |
Brian Osman | 9c3eccd | 2020-05-21 16:41:43 -0400 | [diff] [blame] | 327 | SkPaint paint; |
Brian Osman | 9c3eccd | 2020-05-21 16:41:43 -0400 | [diff] [blame] | 328 | |
Brian Osman | 2c28bf9 | 2020-05-28 13:38:24 -0400 | [diff] [blame] | 329 | // TODO: Should we add SkImage::makeNormalizedShader() to handle this automatically? |
| 330 | SkMatrix normalize = SkMatrix::Scale(1.0f / (kSize * kSize), 1.0f / kSize); |
| 331 | |
Brian Osman | 9c3eccd | 2020-05-21 16:41:43 -0400 | [diff] [blame] | 332 | // Now draw the image with an identity color cube - it should look like the original |
Mike Reed | 4106819 | 2020-12-09 21:48:52 -0500 | [diff] [blame] | 333 | builder.child("color_cube") = fIdentityCube->makeShader(sampling, normalize); |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 334 | paint.setShader(builder.makeShader()); |
Brian Osman | 9c3eccd | 2020-05-21 16:41:43 -0400 | [diff] [blame] | 335 | canvas->translate(256, 0); |
| 336 | canvas->drawRect({ 0, 0, 256, 256 }, paint); |
| 337 | |
| 338 | // ... and with a sepia-tone color cube. This should match the sepia-toned image. |
Mike Reed | 4106819 | 2020-12-09 21:48:52 -0500 | [diff] [blame] | 339 | builder.child("color_cube") = fSepiaCube->makeShader(sampling, normalize); |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 340 | paint.setShader(builder.makeShader()); |
Brian Osman | 9c3eccd | 2020-05-21 16:41:43 -0400 | [diff] [blame] | 341 | canvas->translate(0, 256); |
| 342 | canvas->drawRect({ 0, 0, 256, 256 }, paint); |
Brian Osman | 9c3eccd | 2020-05-21 16:41:43 -0400 | [diff] [blame] | 343 | } |
| 344 | }; |
| 345 | DEF_GM(return new ColorCubeRT;) |
Brian Osman | a7685b2 | 2020-07-10 14:08:56 -0400 | [diff] [blame] | 346 | |
Brian Osman | 6285d64 | 2021-05-05 08:24:03 -0400 | [diff] [blame] | 347 | // Same as above, but demonstrating how to implement this as a runtime color filter (that samples |
| 348 | // a shader child for the LUT). |
| 349 | class ColorCubeColorFilterRT : public RuntimeShaderGM { |
| 350 | public: |
| 351 | ColorCubeColorFilterRT() : RuntimeShaderGM("color_cube_cf_rt", {512, 512}, R"( |
| 352 | uniform shader color_cube; |
| 353 | |
| 354 | uniform float rg_scale; |
| 355 | uniform float rg_bias; |
| 356 | uniform float b_scale; |
| 357 | uniform float inv_size; |
| 358 | |
| 359 | half4 main(half4 inColor) { |
| 360 | float4 c = unpremul(inColor); |
| 361 | |
| 362 | // Map to cube coords: |
| 363 | float3 cubeCoords = float3(c.rg * rg_scale + rg_bias, c.b * b_scale); |
| 364 | |
| 365 | // Compute slice coordinate |
| 366 | float2 coords1 = float2((floor(cubeCoords.b) + cubeCoords.r) * inv_size, cubeCoords.g); |
| 367 | float2 coords2 = float2(( ceil(cubeCoords.b) + cubeCoords.r) * inv_size, cubeCoords.g); |
| 368 | |
| 369 | // Two bilinear fetches, plus a manual lerp for the third axis: |
Brian Osman | cbfa34a | 2021-09-02 09:26:27 -0400 | [diff] [blame] | 370 | half4 color = mix(color_cube.eval(coords1), color_cube.eval(coords2), |
Brian Osman | 6285d64 | 2021-05-05 08:24:03 -0400 | [diff] [blame] | 371 | fract(cubeCoords.b)); |
| 372 | |
| 373 | // Premul again |
| 374 | color.rgb *= color.a; |
| 375 | |
| 376 | return color; |
| 377 | } |
| 378 | )", kColorFilter_RTFlag) {} |
| 379 | |
| 380 | sk_sp<SkImage> fMandrill, fMandrillSepia, fIdentityCube, fSepiaCube; |
| 381 | |
| 382 | void onOnceBeforeDraw() override { |
| 383 | fMandrill = GetResourceAsImage("images/mandrill_256.png"); |
| 384 | fMandrillSepia = GetResourceAsImage("images/mandrill_sepia.png"); |
| 385 | fIdentityCube = GetResourceAsImage("images/lut_identity.png"); |
| 386 | fSepiaCube = GetResourceAsImage("images/lut_sepia.png"); |
| 387 | |
| 388 | this->RuntimeShaderGM::onOnceBeforeDraw(); |
| 389 | } |
| 390 | |
| 391 | void onDraw(SkCanvas* canvas) override { |
| 392 | // First we draw the unmodified image, and a copy that was sepia-toned in Photoshop: |
| 393 | canvas->drawImage(fMandrill, 0, 0); |
| 394 | canvas->drawImage(fMandrillSepia, 0, 256); |
| 395 | |
| 396 | // LUT dimensions should be (kSize^2, kSize) |
| 397 | constexpr float kSize = 16.0f; |
| 398 | |
| 399 | const SkSamplingOptions sampling(SkFilterMode::kLinear); |
| 400 | |
| 401 | float uniforms[] = { |
| 402 | (kSize - 1) / kSize, // rg_scale |
| 403 | 0.5f / kSize, // rg_bias |
| 404 | kSize - 1, // b_scale |
| 405 | 1.0f / kSize, // inv_size |
| 406 | }; |
| 407 | |
| 408 | SkPaint paint; |
| 409 | |
| 410 | // TODO: Should we add SkImage::makeNormalizedShader() to handle this automatically? |
| 411 | SkMatrix normalize = SkMatrix::Scale(1.0f / (kSize * kSize), 1.0f / kSize); |
| 412 | |
| 413 | // Now draw the image with an identity color cube - it should look like the original |
| 414 | SkRuntimeEffect::ChildPtr children[] = {fIdentityCube->makeShader(sampling, normalize)}; |
| 415 | paint.setColorFilter(fEffect->makeColorFilter( |
| 416 | SkData::MakeWithCopy(uniforms, sizeof(uniforms)), SkMakeSpan(children))); |
| 417 | canvas->drawImage(fMandrill, 256, 0, sampling, &paint); |
| 418 | |
| 419 | // ... and with a sepia-tone color cube. This should match the sepia-toned image. |
| 420 | children[0] = fSepiaCube->makeShader(sampling, normalize); |
| 421 | paint.setColorFilter(fEffect->makeColorFilter( |
| 422 | SkData::MakeWithCopy(uniforms, sizeof(uniforms)), SkMakeSpan(children))); |
| 423 | canvas->drawImage(fMandrill, 256, 256, sampling, &paint); |
| 424 | } |
| 425 | }; |
| 426 | DEF_GM(return new ColorCubeColorFilterRT;) |
| 427 | |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 428 | class DefaultColorRT : public RuntimeShaderGM { |
| 429 | public: |
| 430 | DefaultColorRT() : RuntimeShaderGM("default_color_rt", {512, 256}, R"( |
John Stiles | 67f443b | 2021-09-30 12:45:36 -0400 | [diff] [blame] | 431 | uniform shader child; |
Brian Osman | f6123f1 | 2021-04-15 13:52:43 -0400 | [diff] [blame] | 432 | half4 main(float2 xy) { |
John Stiles | 67f443b | 2021-09-30 12:45:36 -0400 | [diff] [blame] | 433 | return child.eval(xy); |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 434 | } |
| 435 | )") {} |
| 436 | |
Brian Osman | a7685b2 | 2020-07-10 14:08:56 -0400 | [diff] [blame] | 437 | sk_sp<SkImage> fMandrill; |
Brian Osman | a7685b2 | 2020-07-10 14:08:56 -0400 | [diff] [blame] | 438 | |
| 439 | void onOnceBeforeDraw() override { |
| 440 | fMandrill = GetResourceAsImage("images/mandrill_256.png"); |
Brian Osman | 44fafa6 | 2020-07-15 10:52:37 -0400 | [diff] [blame] | 441 | this->RuntimeShaderGM::onOnceBeforeDraw(); |
Brian Osman | a7685b2 | 2020-07-10 14:08:56 -0400 | [diff] [blame] | 442 | } |
| 443 | |
Brian Osman | a7685b2 | 2020-07-10 14:08:56 -0400 | [diff] [blame] | 444 | void onDraw(SkCanvas* canvas) override { |
| 445 | SkRuntimeShaderBuilder builder(fEffect); |
| 446 | |
| 447 | // First, we leave the child as null, so sampling it returns the default (paint) color |
| 448 | SkPaint paint; |
| 449 | paint.setColor4f({ 0.25f, 0.75f, 0.75f, 1.0f }); |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 450 | paint.setShader(builder.makeShader()); |
Brian Osman | a7685b2 | 2020-07-10 14:08:56 -0400 | [diff] [blame] | 451 | canvas->drawRect({ 0, 0, 256, 256 }, paint); |
| 452 | |
| 453 | // Now we bind an image shader as the child. This (by convention) scales by the paint alpha |
John Stiles | 67f443b | 2021-09-30 12:45:36 -0400 | [diff] [blame] | 454 | builder.child("child") = fMandrill->makeShader(SkSamplingOptions()); |
Brian Osman | a7685b2 | 2020-07-10 14:08:56 -0400 | [diff] [blame] | 455 | paint.setColor4f({ 1.0f, 1.0f, 1.0f, 0.5f }); |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 456 | paint.setShader(builder.makeShader()); |
Brian Osman | a7685b2 | 2020-07-10 14:08:56 -0400 | [diff] [blame] | 457 | canvas->translate(256, 0); |
| 458 | canvas->drawRect({ 0, 0, 256, 256 }, paint); |
| 459 | |
| 460 | } |
| 461 | }; |
| 462 | DEF_GM(return new DefaultColorRT;) |
Mike Klein | 71d420d | 2021-02-03 09:54:07 -0600 | [diff] [blame] | 463 | |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 464 | // Emits coverage for a rounded rectangle whose corners are superellipses defined by the boundary: |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 465 | // |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 466 | // x^n + y^n == 1 |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 467 | // |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 468 | // Where x and y are normalized, clamped coordinates ranging from 0..1 inside the nearest corner's |
| 469 | // bounding box. |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 470 | // |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 471 | // See: https://en.wikipedia.org/wiki/Superellipse |
| 472 | class ClipSuperRRect : public RuntimeShaderGM { |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 473 | public: |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 474 | ClipSuperRRect(const char* name, float power) : RuntimeShaderGM(name, {500, 500}, R"( |
| 475 | uniform float power_minus1; |
| 476 | uniform float2 stretch_factor; |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 477 | uniform float2x2 derivatives; |
| 478 | half4 main(float2 xy) { |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 479 | xy = max(abs(xy) + stretch_factor, 0); |
| 480 | float2 exp_minus1 = pow(xy, power_minus1.xx); // If power == 3.5: xy * xy * sqrt(xy) |
| 481 | float f = dot(exp_minus1, xy) - 1; // f = x^n + y^n - 1 |
| 482 | float2 grad = exp_minus1 * derivatives; |
| 483 | float fwidth = abs(grad.x) + abs(grad.y) + 1e-12; // 1e-12 to avoid a divide by zero. |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 484 | return half4(saturate(.5 - f/fwidth)); // Approx coverage by riding the gradient to f=0. |
| 485 | } |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 486 | )"), fPower(power) {} |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 487 | |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 488 | void drawSuperRRect(SkCanvas* canvas, const SkRect& superRRect, float radX, float radY, |
| 489 | SkColor color) { |
| 490 | SkPaint paint; |
| 491 | paint.setColor(color); |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 492 | |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 493 | if (fPower == 2) { |
| 494 | // Draw a normal round rect for the sake of testing. |
| 495 | SkRRect rrect = SkRRect::MakeRectXY(superRRect, radX, radY); |
| 496 | paint.setAntiAlias(true); |
| 497 | canvas->drawRRect(rrect, paint); |
| 498 | return; |
| 499 | } |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 500 | |
| 501 | SkRuntimeShaderBuilder builder(fEffect); |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 502 | builder.uniform("power_minus1") = fPower - 1; |
| 503 | |
| 504 | // Size the corners such that the "apex" of our "super" rounded corner is in the same |
| 505 | // location that the apex of a circular rounded corner would be with the given radii. We |
| 506 | // define the apex as the point on the rounded corner that is 45 degrees between the |
| 507 | // horizontal and vertical edges. |
| 508 | float scale = (1 - SK_ScalarRoot2Over2) / (1 - exp2f(-1/fPower)); |
| 509 | float cornerWidth = radX * scale; |
| 510 | float cornerHeight = radY * scale; |
| 511 | cornerWidth = std::min(cornerWidth, superRRect.width() * .5f); |
| 512 | cornerHeight = std::min(cornerHeight, superRRect.height() * .5f); |
| 513 | // The stretch factor controls how long the flat edge should be between rounded corners. |
| 514 | builder.uniform("stretch_factor") = SkV2{1 - superRRect.width()*.5f / cornerWidth, |
| 515 | 1 - superRRect.height()*.5f / cornerHeight}; |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 516 | |
| 517 | // Calculate a 2x2 "derivatives" matrix that the shader will use to find the gradient. |
| 518 | // |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 519 | // f = s^n + t^n - 1 [s,t are "super" rounded corner coords in normalized 0..1 space] |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 520 | // |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 521 | // gradient = [df/dx df/dy] = [ns^(n-1) nt^(n-1)] * |ds/dx ds/dy| |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 522 | // |dt/dx dt/dy| |
| 523 | // |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 524 | // = [s^(n-1) t^(n-1)] * |n 0| * |ds/dx ds/dy| |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 525 | // |0 n| |dt/dx dt/dy| |
| 526 | // |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 527 | // = [s^(n-1) t^(n-1)] * |2n/cornerWidth 0| * mat2x2(canvasMatrix)^-1 |
| 528 | // |0 2n/cornerHeight| |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 529 | // |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 530 | // = [s^(n-1) t^(n-1)] * "derivatives" |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 531 | // |
| 532 | const SkMatrix& M = canvas->getTotalMatrix(); |
| 533 | float a=M.getScaleX(), b=M.getSkewX(), c=M.getSkewY(), d=M.getScaleY(); |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 534 | float determinant = a*d - b*c; |
| 535 | float dx = fPower / (cornerWidth * determinant); |
| 536 | float dy = fPower / (cornerHeight * determinant); |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 537 | builder.uniform("derivatives") = SkV4{d*dx, -c*dy, -b*dx, a*dy}; |
| 538 | |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 539 | // This matrix will be inverted by the effect system, giving a matrix that converts local |
| 540 | // coordinates to (almost) coner coordinates. To get the rest of the way to the nearest |
| 541 | // corner's space, the shader will have to take the absolute value, add the stretch_factor, |
| 542 | // then clamp above zero. |
| 543 | SkMatrix cornerToLocal; |
| 544 | cornerToLocal.setScaleTranslate(cornerWidth, cornerHeight, superRRect.centerX(), |
| 545 | superRRect.centerY()); |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 546 | canvas->clipShader(builder.makeShader(&cornerToLocal)); |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 547 | |
| 548 | // Bloat the outer edges of the rect we will draw so it contains all the antialiased pixels. |
| 549 | // Bloat by a full pixel instead of half in case Skia is in a mode that draws this rect with |
| 550 | // unexpected AA of its own. |
| 551 | float inverseDet = 1 / fabsf(determinant); |
| 552 | float bloatX = (fabsf(d) + fabsf(c)) * inverseDet; |
| 553 | float bloatY = (fabsf(b) + fabsf(a)) * inverseDet; |
| 554 | canvas->drawRect(superRRect.makeOutset(bloatX, bloatY), paint); |
| 555 | } |
| 556 | |
| 557 | void onDraw(SkCanvas* canvas) override { |
| 558 | SkRandom rand(2); |
| 559 | |
| 560 | canvas->save(); |
| 561 | canvas->translate(canvas->imageInfo().width() / 2.f, canvas->imageInfo().height() / 2.f); |
| 562 | |
| 563 | canvas->save(); |
| 564 | canvas->rotate(21); |
| 565 | this->drawSuperRRect(canvas, SkRect::MakeXYWH(-5, 25, 175, 100), 50, 30, |
| 566 | rand.nextU() | 0xff808080); |
| 567 | canvas->restore(); |
| 568 | |
| 569 | canvas->save(); |
| 570 | canvas->rotate(94); |
| 571 | this->drawSuperRRect(canvas, SkRect::MakeXYWH(95, 75, 125, 100), 30, 30, |
| 572 | rand.nextU() | 0xff808080); |
| 573 | canvas->restore(); |
| 574 | |
| 575 | canvas->save(); |
| 576 | canvas->rotate(132); |
| 577 | this->drawSuperRRect(canvas, SkRect::MakeXYWH(0, 75, 150, 100), 40, 30, |
| 578 | rand.nextU() | 0xff808080); |
| 579 | canvas->restore(); |
| 580 | |
| 581 | canvas->save(); |
| 582 | canvas->rotate(282); |
| 583 | this->drawSuperRRect(canvas, SkRect::MakeXYWH(15, -20, 100, 100), 20, 20, |
| 584 | rand.nextU() | 0xff808080); |
| 585 | canvas->restore(); |
| 586 | |
| 587 | canvas->save(); |
| 588 | canvas->rotate(0); |
| 589 | this->drawSuperRRect(canvas, SkRect::MakeXYWH(140, -50, 90, 110), 25, 25, |
| 590 | rand.nextU() | 0xff808080); |
| 591 | canvas->restore(); |
| 592 | |
| 593 | canvas->save(); |
| 594 | canvas->rotate(-35); |
| 595 | this->drawSuperRRect(canvas, SkRect::MakeXYWH(160, -60, 60, 90), 18, 18, |
| 596 | rand.nextU() | 0xff808080); |
| 597 | canvas->restore(); |
| 598 | |
| 599 | canvas->save(); |
| 600 | canvas->rotate(65); |
| 601 | this->drawSuperRRect(canvas, SkRect::MakeXYWH(220, -120, 60, 90), 18, 18, |
| 602 | rand.nextU() | 0xff808080); |
| 603 | canvas->restore(); |
| 604 | |
| 605 | canvas->save(); |
| 606 | canvas->rotate(265); |
| 607 | this->drawSuperRRect(canvas, SkRect::MakeXYWH(150, -129, 80, 160), 24, 39, |
| 608 | rand.nextU() | 0xff808080); |
| 609 | canvas->restore(); |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 610 | |
| 611 | canvas->restore(); |
| 612 | } |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 613 | |
| 614 | private: |
| 615 | const float fPower; |
Chris Dalton | 4e94fd1 | 2021-03-15 10:16:09 -0600 | [diff] [blame] | 616 | }; |
Chris Dalton | 224e5e4 | 2021-04-16 11:43:39 -0600 | [diff] [blame] | 617 | DEF_GM(return new ClipSuperRRect("clip_super_rrect_pow2", 2);) |
| 618 | // DEF_GM(return new ClipSuperRRect("clip_super_rrect_pow3", 3);) |
| 619 | DEF_GM(return new ClipSuperRRect("clip_super_rrect_pow3.5", 3.5);) |
| 620 | // DEF_GM(return new ClipSuperRRect("clip_super_rrect_pow4", 4);) |
| 621 | // DEF_GM(return new ClipSuperRRect("clip_super_rrect_pow4.5", 4.5);) |
| 622 | // DEF_GM(return new ClipSuperRRect("clip_super_rrect_pow5", 5);) |
Mike Klein | 71d420d | 2021-02-03 09:54:07 -0600 | [diff] [blame] | 623 | |
Brian Osman | 2f2977e | 2021-12-07 16:05:39 -0500 | [diff] [blame] | 624 | class LinearGradientRT : public RuntimeShaderGM { |
| 625 | public: |
| 626 | LinearGradientRT() : RuntimeShaderGM("linear_gradient_rt", {256 + 10, 128 + 15}, R"( |
| 627 | layout(color) uniform vec4 in_colors0; |
| 628 | layout(color) uniform vec4 in_colors1; |
| 629 | |
| 630 | vec4 main(vec2 p) { |
| 631 | float t = p.x / 256; |
| 632 | if (p.y < 32) { |
| 633 | return mix(in_colors0, in_colors1, t); |
| 634 | } else { |
| 635 | vec3 linColor0 = toLinearSrgb(in_colors0.rgb); |
| 636 | vec3 linColor1 = toLinearSrgb(in_colors1.rgb); |
| 637 | vec3 linColor = mix(linColor0, linColor1, t); |
| 638 | return fromLinearSrgb(linColor).rgb1; |
| 639 | } |
| 640 | } |
| 641 | )") {} |
| 642 | |
| 643 | void onDraw(SkCanvas* canvas) override { |
| 644 | // Colors chosen to use values other than 0 and 1 - so that it's obvious if the conversion |
| 645 | // intrinsics are doing anything. (Most transfer functions map 0 -> 0 and 1 -> 1). |
| 646 | SkRuntimeShaderBuilder builder(fEffect); |
| 647 | builder.uniform("in_colors0") = SkColor4f{0.75f, 0.25f, 0.0f, 1.0f}; |
| 648 | builder.uniform("in_colors1") = SkColor4f{0.0f, 0.75f, 0.25f, 1.0f}; |
| 649 | SkPaint paint; |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 650 | paint.setShader(builder.makeShader()); |
Brian Osman | 2f2977e | 2021-12-07 16:05:39 -0500 | [diff] [blame] | 651 | |
| 652 | canvas->save(); |
| 653 | canvas->clear(SK_ColorWHITE); |
| 654 | canvas->translate(5, 5); |
| 655 | |
| 656 | // We draw everything twice. First to a surface with no color management, where the |
| 657 | // intrinsics should do nothing (eg, the top bar should look the same in the top and bottom |
| 658 | // halves). Then to an sRGB surface, where they should produce linearly interpolated |
| 659 | // gradients (the bottom half of the second bar should be brighter than the top half). |
| 660 | for (auto cs : {static_cast<SkColorSpace*>(nullptr), sk_srgb_singleton()}) { |
| 661 | SkImageInfo info = SkImageInfo::Make( |
| 662 | 256, 64, kN32_SkColorType, kPremul_SkAlphaType, sk_ref_sp(cs)); |
| 663 | auto surface = canvas->makeSurface(info); |
| 664 | if (!surface) { |
| 665 | surface = SkSurface::MakeRaster(info); |
| 666 | } |
| 667 | |
| 668 | surface->getCanvas()->drawRect({0, 0, 256, 64}, paint); |
| 669 | canvas->drawImage(surface->makeImageSnapshot(), 0, 0); |
| 670 | canvas->translate(0, 64 + 5); |
| 671 | } |
| 672 | |
| 673 | canvas->restore(); |
| 674 | } |
| 675 | }; |
| 676 | DEF_GM(return new LinearGradientRT;) |
| 677 | |
Mike Klein | 71d420d | 2021-02-03 09:54:07 -0600 | [diff] [blame] | 678 | DEF_SIMPLE_GM(child_sampling_rt, canvas, 256,256) { |
| 679 | static constexpr char scale[] = |
| 680 | "uniform shader child;" |
| 681 | "half4 main(float2 xy) {" |
Brian Osman | cbfa34a | 2021-09-02 09:26:27 -0400 | [diff] [blame] | 682 | " return child.eval(xy*0.1);" |
Mike Klein | 71d420d | 2021-02-03 09:54:07 -0600 | [diff] [blame] | 683 | "}"; |
| 684 | |
| 685 | SkPaint p; |
| 686 | p.setColor(SK_ColorRED); |
| 687 | p.setAntiAlias(true); |
| 688 | p.setStyle(SkPaint::kStroke_Style); |
| 689 | p.setStrokeWidth(1); |
| 690 | |
| 691 | auto surf = SkSurface::MakeRasterN32Premul(100,100); |
| 692 | surf->getCanvas()->drawLine(0, 0, 100, 100, p); |
| 693 | auto shader = surf->makeImageSnapshot()->makeShader(SkSamplingOptions(SkFilterMode::kLinear)); |
| 694 | |
Brian Osman | f6123f1 | 2021-04-15 13:52:43 -0400 | [diff] [blame] | 695 | SkRuntimeShaderBuilder builder(SkRuntimeEffect::MakeForShader(SkString(scale)).effect); |
Mike Klein | 71d420d | 2021-02-03 09:54:07 -0600 | [diff] [blame] | 696 | builder.child("child") = shader; |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 697 | p.setShader(builder.makeShader()); |
Mike Klein | 71d420d | 2021-02-03 09:54:07 -0600 | [diff] [blame] | 698 | |
| 699 | canvas->drawPaint(p); |
| 700 | } |
Brian Osman | d34b49f | 2021-10-18 14:07:43 -0400 | [diff] [blame] | 701 | |
| 702 | static sk_sp<SkShader> normal_map_shader() { |
| 703 | // Produces a hemispherical normal: |
| 704 | static const char* kSrc = R"( |
| 705 | half4 main(vec2 p) { |
| 706 | p = (p / 256) * 2 - 1; |
| 707 | float p2 = dot(p, p); |
| 708 | vec3 v = (p2 > 1) ? vec3(0, 0, 1) : vec3(p, sqrt(1 - p2)); |
| 709 | return (v * 0.5 + 0.5).xyz1; |
| 710 | } |
| 711 | )"; |
| 712 | auto effect = SkRuntimeEffect::MakeForShader(SkString(kSrc)).effect; |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 713 | return effect->makeShader(nullptr, {}); |
Brian Osman | d34b49f | 2021-10-18 14:07:43 -0400 | [diff] [blame] | 714 | } |
| 715 | |
Brian Osman | 20c6a94 | 2021-11-29 12:27:00 -0500 | [diff] [blame] | 716 | static sk_sp<SkImage> normal_map_image() { |
Brian Osman | d34b49f | 2021-10-18 14:07:43 -0400 | [diff] [blame] | 717 | // Above, baked into an image: |
Brian Osman | 20c6a94 | 2021-11-29 12:27:00 -0500 | [diff] [blame] | 718 | auto info = SkImageInfo::Make(256, 256, kN32_SkColorType, kPremul_SkAlphaType); |
| 719 | auto surface = SkSurface::MakeRaster(info); |
Brian Osman | d34b49f | 2021-10-18 14:07:43 -0400 | [diff] [blame] | 720 | SkPaint p; |
| 721 | p.setShader(normal_map_shader()); |
| 722 | surface->getCanvas()->drawPaint(p); |
Brian Osman | 20c6a94 | 2021-11-29 12:27:00 -0500 | [diff] [blame] | 723 | return surface->makeImageSnapshot(); |
| 724 | } |
| 725 | |
| 726 | static sk_sp<SkShader> normal_map_image_shader() { |
| 727 | return normal_map_image()->makeShader(SkSamplingOptions{}); |
| 728 | } |
| 729 | |
| 730 | static sk_sp<SkShader> normal_map_raw_image_shader() { |
| 731 | return normal_map_image()->makeRawShader(SkSamplingOptions{}); |
| 732 | } |
| 733 | |
| 734 | static sk_sp<SkImage> normal_map_unpremul_image() { |
| 735 | auto image = normal_map_image(); |
| 736 | SkPixmap pm; |
| 737 | SkAssertResult(image->peekPixels(&pm)); |
| 738 | SkBitmap bmp; |
| 739 | bmp.allocPixels(image->imageInfo().makeAlphaType(kUnpremul_SkAlphaType)); |
| 740 | // Copy all pixels over, but set alpha to 0 |
| 741 | for (int y = 0; y < pm.height(); y++) { |
| 742 | for (int x = 0; x < pm.width(); x++) { |
| 743 | *bmp.getAddr32(x, y) = *pm.addr32(x, y) & 0x00FFFFFF; |
| 744 | } |
| 745 | } |
| 746 | return bmp.asImage(); |
| 747 | } |
| 748 | |
| 749 | static sk_sp<SkShader> normal_map_unpremul_image_shader() { |
| 750 | return normal_map_unpremul_image()->makeShader(SkSamplingOptions{}); |
| 751 | } |
| 752 | |
| 753 | static sk_sp<SkShader> normal_map_raw_unpremul_image_shader() { |
| 754 | return normal_map_unpremul_image()->makeRawShader(SkSamplingOptions{}); |
Brian Osman | d34b49f | 2021-10-18 14:07:43 -0400 | [diff] [blame] | 755 | } |
| 756 | |
| 757 | static sk_sp<SkShader> lit_shader(sk_sp<SkShader> normals) { |
Brian Osman | 2f2977e | 2021-12-07 16:05:39 -0500 | [diff] [blame] | 758 | // Simple N-dot-L against a fixed, directional light: |
Brian Osman | d34b49f | 2021-10-18 14:07:43 -0400 | [diff] [blame] | 759 | static const char* kSrc = R"( |
| 760 | uniform shader normals; |
| 761 | half4 main(vec2 p) { |
| 762 | vec3 n = normalize(normals.eval(p).xyz * 2 - 1); |
| 763 | vec3 l = normalize(vec3(1, -1, 1)); |
Brian Osman | f893df9 | 2021-11-09 10:10:45 -0500 | [diff] [blame] | 764 | return saturate(dot(n, l)).xxx1; |
Brian Osman | d34b49f | 2021-10-18 14:07:43 -0400 | [diff] [blame] | 765 | } |
| 766 | )"; |
| 767 | auto effect = SkRuntimeEffect::MakeForShader(SkString(kSrc)).effect; |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 768 | return effect->makeShader(nullptr, &normals, 1); |
Brian Osman | d34b49f | 2021-10-18 14:07:43 -0400 | [diff] [blame] | 769 | } |
| 770 | |
Brian Osman | 2f2977e | 2021-12-07 16:05:39 -0500 | [diff] [blame] | 771 | static sk_sp<SkShader> lit_shader_linear(sk_sp<SkShader> normals) { |
| 772 | // Simple N-dot-L against a fixed, directional light, done in linear space: |
| 773 | static const char* kSrc = R"( |
| 774 | uniform shader normals; |
| 775 | half4 main(vec2 p) { |
| 776 | vec3 n = normalize(normals.eval(p).xyz * 2 - 1); |
| 777 | vec3 l = normalize(vec3(1, -1, 1)); |
| 778 | return fromLinearSrgb(saturate(dot(n, l)).xxx).xxx1; |
| 779 | } |
| 780 | )"; |
| 781 | auto effect = SkRuntimeEffect::MakeForShader(SkString(kSrc)).effect; |
Brian Osman | cd189e8 | 2022-02-09 11:56:45 -0500 | [diff] [blame] | 782 | return effect->makeShader(nullptr, &normals, 1); |
Brian Osman | 2f2977e | 2021-12-07 16:05:39 -0500 | [diff] [blame] | 783 | } |
| 784 | |
Brian Osman | d34b49f | 2021-10-18 14:07:43 -0400 | [diff] [blame] | 785 | DEF_SIMPLE_GM(paint_alpha_normals_rt, canvas, 512,512) { |
| 786 | // Various draws, with non-opaque paint alpha. This demonstrates several issues around how |
| 787 | // paint alpha is applied differently on CPU (globally, after all shaders) and GPU (per shader, |
| 788 | // inconsistently). See: skbug.com/11942 |
| 789 | // |
| 790 | // When this works, it will be a demo of applying paint alpha to fade out a complex effect. |
| 791 | auto draw_shader = [=](int x, int y, sk_sp<SkShader> shader) { |
| 792 | SkPaint p; |
| 793 | p.setAlpha(164); |
| 794 | p.setShader(shader); |
| 795 | |
| 796 | canvas->save(); |
| 797 | canvas->translate(x, y); |
| 798 | canvas->clipRect({0, 0, 256, 256}); |
| 799 | canvas->drawPaint(p); |
| 800 | canvas->restore(); |
| 801 | }; |
| 802 | |
| 803 | draw_shader(0, 0, normal_map_shader()); |
| 804 | draw_shader(0, 256, normal_map_image_shader()); |
| 805 | |
| 806 | draw_shader(256, 0, lit_shader(normal_map_shader())); |
| 807 | draw_shader(256, 256, lit_shader(normal_map_image_shader())); |
| 808 | } |
Brian Osman | 20c6a94 | 2021-11-29 12:27:00 -0500 | [diff] [blame] | 809 | |
| 810 | DEF_SIMPLE_GM(raw_image_shader_normals_rt, canvas, 768, 512) { |
| 811 | // Demonstrates the utility of SkImage::makeRawShader, for non-color child shaders. |
| 812 | |
| 813 | // First, make an offscreen surface, so we can control the destination color space: |
| 814 | auto surfInfo = SkImageInfo::Make(512, 512, |
| 815 | kN32_SkColorType, |
| 816 | kPremul_SkAlphaType, |
| 817 | SkColorSpace::MakeSRGB()->makeColorSpin()); |
| 818 | auto surface = canvas->makeSurface(surfInfo); |
| 819 | if (!surface) { |
| 820 | surface = SkSurface::MakeRaster(surfInfo); |
| 821 | } |
| 822 | |
| 823 | auto draw_shader = [](int x, int y, sk_sp<SkShader> shader, SkCanvas* canvas) { |
| 824 | SkPaint p; |
| 825 | p.setShader(shader); |
| 826 | |
| 827 | canvas->save(); |
| 828 | canvas->translate(x, y); |
| 829 | canvas->clipRect({0, 0, 256, 256}); |
| 830 | canvas->drawPaint(p); |
| 831 | canvas->restore(); |
| 832 | }; |
| 833 | |
| 834 | sk_sp<SkShader> colorNormals = normal_map_image_shader(), |
| 835 | rawNormals = normal_map_raw_image_shader(); |
| 836 | |
| 837 | // Draw our normal map as colors (will be color-rotated), and raw (untransformed) |
| 838 | draw_shader(0, 0, colorNormals, surface->getCanvas()); |
| 839 | draw_shader(0, 256, rawNormals, surface->getCanvas()); |
| 840 | |
| 841 | // Now draw our lighting shader using the normal and raw versions of the normals as children. |
| 842 | // The top image will have the normals rotated (incorrectly), so the lighting is very dark. |
| 843 | draw_shader(256, 0, lit_shader(colorNormals), surface->getCanvas()); |
| 844 | draw_shader(256, 256, lit_shader(rawNormals), surface->getCanvas()); |
| 845 | |
| 846 | // Now draw the offscreen surface back to our original canvas. If we do this naively, the image |
| 847 | // will be un-transformed back to the canvas' color space. That will have the effect of undoing |
| 848 | // the color spin on the upper-left, and APPLYING a color-spin on the bottom left. To preserve |
| 849 | // the intent of this GM (and make it draw consistently whether or not the original surface has |
| 850 | // a color space attached), we reinterpret the offscreen image as being in sRGB: |
| 851 | canvas->drawImage( |
| 852 | surface->makeImageSnapshot()->reinterpretColorSpace(SkColorSpace::MakeSRGB()), 0, 0); |
| 853 | |
| 854 | // Finally, to demonstrate that raw unpremul image shaders don't premul, draw lighting two more |
| 855 | // times, with an unpremul normal map (containing ZERO in the alpha channel). THe top will |
| 856 | // premultiply the normals, resulting in totally dark lighting. The bottom will retain the RGB |
| 857 | // encoded normals, even with zero alpha: |
| 858 | draw_shader(512, 0, lit_shader(normal_map_unpremul_image_shader()), canvas); |
| 859 | draw_shader(512, 256, lit_shader(normal_map_raw_unpremul_image_shader()), canvas); |
| 860 | } |
Brian Osman | 2f2977e | 2021-12-07 16:05:39 -0500 | [diff] [blame] | 861 | |
| 862 | DEF_SIMPLE_GM(lit_shader_linear_rt, canvas, 512, 256) { |
| 863 | // First, make an offscreen surface, so we can control the destination color space: |
| 864 | auto surfInfo = SkImageInfo::Make(512, 256, |
| 865 | kN32_SkColorType, |
| 866 | kPremul_SkAlphaType, |
| 867 | SkColorSpace::MakeSRGB()); |
| 868 | auto surface = canvas->makeSurface(surfInfo); |
| 869 | if (!surface) { |
| 870 | surface = SkSurface::MakeRaster(surfInfo); |
| 871 | } |
| 872 | |
| 873 | auto draw_shader = [](int x, int y, sk_sp<SkShader> shader, SkCanvas* canvas) { |
| 874 | SkPaint p; |
| 875 | p.setShader(shader); |
| 876 | |
| 877 | canvas->save(); |
| 878 | canvas->translate(x, y); |
| 879 | canvas->clipRect({0, 0, 256, 256}); |
| 880 | canvas->drawPaint(p); |
| 881 | canvas->restore(); |
| 882 | }; |
| 883 | |
| 884 | // We draw two lit spheres - one does math in the working space (so gamma-encoded). The second |
| 885 | // works in linear space, then converts to sRGB. This produces (more accurate) sharp falloff: |
| 886 | draw_shader(0, 0, lit_shader(normal_map_shader()), surface->getCanvas()); |
| 887 | draw_shader(256, 0, lit_shader_linear(normal_map_shader()), surface->getCanvas()); |
| 888 | |
| 889 | // Now draw the offscreen surface back to our original canvas: |
| 890 | canvas->drawImage(surface->makeImageSnapshot(), 0, 0); |
| 891 | } |