81 lines
2.0 KiB
C++
81 lines
2.0 KiB
C++
/*
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* Copyright 2020 Google Inc.
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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/SkData.h"
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struct Info {
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float fNear = 0.05f;
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float fFar = 4;
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float fAngle = SK_ScalarPI / 4;
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SkV3 fEye { 0, 0, 1.0f/tan(fAngle/2) - 1 };
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SkV3 fCOA { 0, 0, 0 };
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SkV3 fUp { 0, 1, 0 };
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};
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static SkM44 inv(const SkM44& m) {
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SkM44 inverse(SkM44::kUninitialized_Constructor);
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if (!m.invert(&inverse)) {
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inverse.setIdentity();
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}
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return inverse;
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}
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static SkM44 make_ctm(const Info& info, const SkM44& model, SkSize size) {
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SkM44 camera, perspective, viewport;
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SkScalar w = size.width();
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SkScalar h = size.height();
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perspective = SkM44::Perspective(info.fNear, info.fFar, info.fAngle);
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camera = SkM44::LookAt(info.fEye, info.fCOA, info.fUp);
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viewport.setScale(w*0.5f, h*0.5f, 1);//.postTranslate(r.centerX(), r.centerY(), 0);
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return viewport * perspective * camera * model * inv(viewport);
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}
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#include "include/core/SkPicture.h"
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#include "include/core/SkPictureRecorder.h"
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static void do_draw(SkCanvas* canvas, SkColor color) {
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SkAutoCanvasRestore acr(canvas, true);
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Info info;
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SkM44 m = SkM44::Rotate({0, 1, 0}, SK_ScalarPI/6);
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canvas->concat(make_ctm(info, m, {300, 300}));
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canvas->translate(150, 150);
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SkPaint paint;
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paint.setColor(color);
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canvas->drawRect({-100, -100, 100, 100}, paint);
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}
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/*
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* Test calling drawables w/ translate and matrices
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*/
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DEF_SIMPLE_GM(sk3d_simple, real_canvas, 300, 300) {
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do_draw(real_canvas, 0xFFFF0000);
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SkPictureRecorder recorder;
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SkCanvas* canvas = recorder.beginRecording(300, 300);
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do_draw(canvas, 0x880000FF);
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auto pic = recorder.finishRecordingAsPicture();
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real_canvas->drawPicture(pic);
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if ((false)) {
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auto data = pic->serialize();
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auto pic2 = SkPicture::MakeFromData(data.get());
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real_canvas->drawPicture(pic2);
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}
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}
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