| /* |
| * Copyright 2020 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/SkColor.h" |
| #include "include/core/SkImage.h" |
| #include "include/core/SkM44.h" |
| #include "include/core/SkMatrix.h" |
| #include "include/core/SkSurface.h" |
| #include "include/effects/SkGradientShader.h" |
| #include "tools/timer/TimeUtils.h" |
| |
| // Adapted from https://codepen.io/adamdupuis/pen/qLYzqB |
| class CrBug224618GM : public skiagm::GM { |
| public: |
| CrBug224618GM() : fTime(0.f) {} |
| |
| protected: |
| SkString onShortName() override { |
| return SkString("crbug_224618"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(kMaxVW, kMaxVW); |
| } |
| |
| // This animates the FOV in viewer, to ensure the panorama covering rects are stable across |
| // a variety of perspective matrices |
| bool onAnimate(double nanos) override { |
| fTime = TimeUtils::Scaled(1e-9f * nanos, 0.5f); |
| return true; |
| } |
| |
| void onOnceBeforeDraw() override { |
| static const SkColor kColors[2] = {SK_ColorTRANSPARENT, SkColorSetARGB(128, 255, 255, 255)}; |
| sk_sp<SkShader> gradient = SkGradientShader::MakeRadial( |
| {200.f, 200.f}, 25.f, kColors, nullptr, 2, SkTileMode::kMirror, |
| SkGradientShader::kInterpolateColorsInPremul_Flag, nullptr); |
| |
| sk_sp<SkSurface> surface = SkSurfaces::Raster(SkImageInfo::MakeN32Premul(400, 400)); |
| |
| SkPaint bgPaint; |
| bgPaint.setShader(gradient); |
| surface->getCanvas()->drawPaint(bgPaint); |
| |
| fCubeImage = surface->makeImageSnapshot(); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkScalar viewportWidth = SkScalarMod(fTime, 10.f) / 10.f * (kMaxVW - kMinVW) + kMinVW; |
| SkScalar radius = viewportWidth / 2.f; // round? |
| // See https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function/perspective |
| SkM44 proj{1.f, 0.f, 0.f, 0.f, |
| 0.f, 1.f, 0.f, 0.f, |
| 0.f, 0.f, 1.f, 0.f, |
| 0.f, 0.f, -1.f / radius, 1.f}; |
| SkM44 zoom = SkM44::Translate(0.f, 0.f, radius); |
| SkM44 postZoom = SkM44::Translate(0.f, 0.f, -radius - 1.f); |
| SkM44 rotateHorizontal = SkM44::Rotate({0, 1, 0}, 2.356194490192345f); |
| |
| // w in degrees will need to be converted to radians |
| SkV4 axisAngles[6] = { |
| {0.f, 1.f, 0.f, -90.f}, // rotateY(-90deg) |
| {1.f, 0.f, 0.f, 0.f}, // <none> |
| {0.f, 1.f, 0.f, 90.f}, // rotateY(90deg) |
| {0.f, 1.f, 0.f, 180.f}, // rotateY(180deg) |
| {1.f, 0.f, 0.f, -90.f}, // rotateX(-90deg) |
| {1.f, 0.f, 0.f, 90.f}, // rotateX(90deg) |
| }; |
| SkColor faceColors[6] = { |
| SK_ColorRED, |
| SK_ColorGREEN, |
| SK_ColorBLUE, |
| SK_ColorYELLOW, |
| SkColorSetARGB(0xFF, 0xFF, 0xA5, 0x00), // orange css |
| SkColorSetARGB(0xFF, 0x80, 0x00, 0x80) // purple css |
| }; |
| |
| for (int i = 0; i < 6; ++i) { |
| SkM44 model = SkM44::Rotate({axisAngles[i].x, axisAngles[i].y, axisAngles[i].z}, |
| SkDegreesToRadians(axisAngles[i].w)); |
| model = SkM44::Translate(radius, radius) * proj * // project and place content |
| zoom * rotateHorizontal * model * postZoom * // main model matrix |
| SkM44::Translate(-radius, -radius); // center content |
| |
| canvas->save(); |
| canvas->concat(model); |
| |
| SkPaint fillPaint; |
| fillPaint.setAntiAlias(true); |
| fillPaint.setColor(faceColors[i]); |
| |
| // Leverages FillRectOp on GPU backend |
| canvas->drawRect(SkRect::MakeWH(viewportWidth, viewportWidth), fillPaint); |
| |
| // Leverages TextureOp on GPU backend, to ensure sure both quad paths handle clipping |
| canvas->drawImageRect(fCubeImage.get(), |
| SkRect::MakeWH(fCubeImage->width(), fCubeImage->height()), |
| SkRect::MakeWH(viewportWidth, viewportWidth), |
| SkSamplingOptions(SkFilterMode::kLinear), &fillPaint, |
| SkCanvas::kFast_SrcRectConstraint); |
| |
| canvas->restore(); |
| } |
| } |
| private: |
| static const int kMaxVW = 800; |
| static const int kMinVW = 300; |
| |
| SkScalar fTime; |
| sk_sp<SkImage> fCubeImage; |
| }; |
| |
| DEF_GM(return new CrBug224618GM();) |