| /* |
| * Copyright 2019 Google LLC |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm/gm.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkData.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/effects/SkRuntimeEffect.h" |
| |
| static const char* RUNTIME_FUNCTIONS_SRC = R"( |
| // Source: @notargs https://twitter.com/notargs/status/1250468645030858753 |
| uniform half4 iResolution; |
| const float iTime = 0; |
| |
| float f(vec3 p) { |
| p.z -= iTime * 10.; |
| float a = p.z * .1; |
| p.xy *= mat2(cos(a), sin(a), -sin(a), cos(a)); |
| return .1 - length(cos(p.xy) + sin(p.yz)); |
| } |
| |
| half4 main(vec2 fragcoord) { |
| vec3 d = .5 - fragcoord.xy1 / iResolution.y; |
| vec3 p=vec3(0); |
| for (int i = 0; i < 32; i++) { |
| p += f(p) * d; |
| } |
| return ((sin(p) + vec3(2, 5, 9)) / length(p)).xyz1; |
| } |
| )"; |
| |
| class RuntimeFunctions : public skiagm::GM { |
| bool runAsBench() const override { return true; } |
| |
| SkString getName() const override { return SkString("runtimefunctions"); } |
| |
| SkISize getISize() override { return {256, 256}; } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkRuntimeEffect::Result result = |
| SkRuntimeEffect::MakeForShader(SkString(RUNTIME_FUNCTIONS_SRC)); |
| SkASSERTF(result.effect, "%s", result.errorText.c_str()); |
| |
| SkMatrix localM; |
| localM.setRotate(90, 128, 128); |
| |
| SkV4 iResolution = { 255, 255, 0, 0 }; |
| auto shader = result.effect->makeShader( |
| SkData::MakeWithCopy(&iResolution, sizeof(iResolution)), nullptr, 0, &localM); |
| SkPaint p; |
| p.setShader(std::move(shader)); |
| canvas->drawRect({0, 0, 256, 256}, p); |
| } |
| }; |
| |
| DEF_GM(return new RuntimeFunctions;) |