119 lines
4.4 KiB
C++
119 lines
4.4 KiB
C++
/*
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* Copyright 2020 Google LLC
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkImage.h"
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#include "include/core/SkM44.h"
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#include "include/core/SkMatrix.h"
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#include "include/core/SkSurface.h"
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#include "include/effects/SkGradientShader.h"
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#include "tools/timer/TimeUtils.h"
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// Adapted from https://codepen.io/adamdupuis/pen/qLYzqB
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class CrBug224618GM : public skiagm::GM {
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public:
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CrBug224618GM() : fTime(0.f) {}
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protected:
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SkString onShortName() override {
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return SkString("crbug_224618");
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}
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SkISize onISize() override {
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return SkISize::Make(kMaxVW, kMaxVW);
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}
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// This animates the FOV in viewer, to ensure the panorama covering rects are stable across
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// a variety of perspective matrices
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bool onAnimate(double nanos) override {
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fTime = TimeUtils::Scaled(1e-9f * nanos, 0.5f);
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return true;
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}
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void onOnceBeforeDraw() override {
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static const SkColor kColors[2] = {SK_ColorTRANSPARENT, SkColorSetARGB(128, 255, 255, 255)};
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sk_sp<SkShader> gradient = SkGradientShader::MakeRadial(
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{200.f, 200.f}, 25.f, kColors, nullptr, 2, SkTileMode::kMirror,
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SkGradientShader::kInterpolateColorsInPremul_Flag, nullptr);
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sk_sp<SkSurface> surface = SkSurface::MakeRasterN32Premul(400, 400);
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SkPaint bgPaint;
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bgPaint.setShader(gradient);
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surface->getCanvas()->drawPaint(bgPaint);
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fCubeImage = surface->makeImageSnapshot();
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}
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void onDraw(SkCanvas* canvas) override {
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SkScalar viewportWidth = SkScalarMod(fTime, 10.f) / 10.f * (kMaxVW - kMinVW) + kMinVW;
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SkScalar radius = viewportWidth / 2.f; // round?
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// See https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function/perspective
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SkM44 proj{1.f, 0.f, 0.f, 0.f,
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0.f, 1.f, 0.f, 0.f,
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0.f, 0.f, 1.f, 0.f,
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0.f, 0.f, -1.f / radius, 1.f};
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SkM44 zoom = SkM44::Translate(0.f, 0.f, radius);
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SkM44 postZoom = SkM44::Translate(0.f, 0.f, -radius - 1.f);
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SkM44 rotateHorizontal = SkM44::Rotate({0, 1, 0}, 2.356194490192345f);
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// w in degrees will need to be converted to radians
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SkV4 axisAngles[6] = {
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{0.f, 1.f, 0.f, -90.f}, // rotateY(-90deg)
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{1.f, 0.f, 0.f, 0.f}, // <none>
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{0.f, 1.f, 0.f, 90.f}, // rotateY(90deg)
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{0.f, 1.f, 0.f, 180.f}, // rotateY(180deg)
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{1.f, 0.f, 0.f, -90.f}, // rotateX(-90deg)
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{1.f, 0.f, 0.f, 90.f}, // rotateX(90deg)
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};
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SkColor faceColors[6] = {
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SK_ColorRED,
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SK_ColorGREEN,
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SK_ColorBLUE,
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SK_ColorYELLOW,
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SkColorSetARGB(0xFF, 0xFF, 0xA5, 0x00), // orange css
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SkColorSetARGB(0xFF, 0x80, 0x00, 0x80) // purple css
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};
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for (int i = 0; i < 6; ++i) {
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SkM44 model = SkM44::Rotate({axisAngles[i].x, axisAngles[i].y, axisAngles[i].z},
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SkDegreesToRadians(axisAngles[i].w));
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model = SkM44::Translate(radius, radius) * proj * // project and place content
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zoom * rotateHorizontal * model * postZoom * // main model matrix
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SkM44::Translate(-radius, -radius); // center content
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canvas->save();
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canvas->concat(model);
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SkPaint fillPaint;
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fillPaint.setAntiAlias(true);
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fillPaint.setColor(faceColors[i]);
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// Leverages FillRectOp on GPU backend
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canvas->drawRect(SkRect::MakeWH(viewportWidth, viewportWidth), fillPaint);
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// Leverages TextureOp on GPU backend, to ensure sure both quad paths handle clipping
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canvas->drawImageRect(fCubeImage.get(),
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SkRect::MakeWH(fCubeImage->width(), fCubeImage->height()),
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SkRect::MakeWH(viewportWidth, viewportWidth),
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SkSamplingOptions(SkFilterMode::kLinear), &fillPaint,
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SkCanvas::kFast_SrcRectConstraint);
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canvas->restore();
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}
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}
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private:
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static const int kMaxVW = 800;
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static const int kMinVW = 300;
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SkScalar fTime;
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sk_sp<SkImage> fCubeImage;
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};
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DEF_GM(return new CrBug224618GM();)
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