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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "Sk3D.h"
#include "SkPath.h"
#include "SkPoint3.h"
#ifdef SK_ENABLE_SKOTTIE
#include "SkAnimTimer.h"
#include "Resources.h"
#include "SkStream.h"
#include "Skottie.h"
static SkMatrix operator*(const SkMatrix& a, const SkMatrix& b) {
SkMatrix44 c;
c.setConcat(a, b);
return c;
}
class GM3d : public skiagm::GM {
float fNear = 0.5;
float fFar = 4;
float fAngle = SK_ScalarPI / 4;
SkPoint3 fEye { 0, 0, 4 };
SkPoint3 fCOA {0,0,0};//{ 0.5f, 0.5f, 0.5f };
SkPoint3 fUp { 0, 1, 0 };
SkPoint3 fP3[8];
sk_sp<skottie::Animation> fAnim;
SkScalar fAnimT = 0;
public:
GM3d() {}
~GM3d() override {}
protected:
void onOnceBeforeDraw() override {
if (auto stream = GetResourceAsStream("skotty/skotty_sample_2.json")) {
fAnim = skottie::Animation::Make(stream.get());
}
int index = 0;
for (float x = 0; x <= 1; ++x) {
for (float y = 0; y <= 1; ++y) {
for (float z = 0; z <= 1; ++z) {
fP3[index++] = { x, y, z };
}
}
}
}
static void draw_viewport(SkCanvas* canvas, const SkMatrix& viewport) {
SkPaint p;
p.setColor(0x10FF0000);
canvas->save();
canvas->concat(viewport);
canvas->drawRect({-1, -1, 1, 1}, p);
p.setColor(0x80FF0000);
canvas->drawLine({-1, -1}, {1, 1}, p);
canvas->drawLine({1, -1}, {-1, 1}, p);
canvas->restore();
}
static void draw_skia(SkCanvas* canvas, const SkMatrix44& m4, const SkMatrix& vp,
skottie::Animation* anim) {
auto proc = [canvas, vp, anim](SkColor c, const SkMatrix44& m4) {
SkPaint p;
p.setColor(c);
SkRect r = { 0, 0, 1, 1 };
canvas->save();
canvas->concat(vp * SkMatrix(m4));
anim->render(canvas, &r);
// canvas->drawRect({0, 0, 1, 1}, p);
canvas->restore();
};
SkMatrix44 tmp(SkMatrix44::kIdentity_Constructor);
proc(0x400000FF, m4);
tmp.setTranslate(0, 0, 1);
proc(0xC00000FF, m4 * tmp);
tmp.setRotateAboutUnit(1, 0, 0, SK_ScalarPI/2);
proc(0x4000FF00, m4 * tmp);
tmp.postTranslate(0, 1, 0);
proc(0xC000FF00, m4 * tmp);
tmp.setRotateAboutUnit(0, 1, 0, -SK_ScalarPI/2);
proc(0x40FF0000, m4 * tmp);
tmp.postTranslate(1, 0, 0);
proc(0xC0FF0000, m4 * tmp);
}
void onDraw(SkCanvas* canvas) override {
if (!fAnim) {
return;
}
SkMatrix44 camera(SkMatrix44::kIdentity_Constructor),
perspective(SkMatrix44::kIdentity_Constructor),
mv(SkMatrix44::kIdentity_Constructor);
SkMatrix viewport;
{
float w = this->width();
float h = this->height();
float s = std::min(w, h);
viewport.setTranslate(1, -1);
viewport.postScale(s/2, -s/2);
draw_viewport(canvas, viewport);
}
Sk3Perspective(&perspective, fNear, fFar, fAngle);
Sk3LookAt(&camera, fEye, fCOA, fUp);
mv.postConcat(camera);
mv.postConcat(perspective);
SkPoint pts[8];
Sk3MapPts(pts, mv, fP3, 8);
viewport.mapPoints(pts, 8);
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
SkPath cube;
cube.moveTo(pts[0]);
cube.lineTo(pts[2]);
cube.lineTo(pts[6]);
cube.lineTo(pts[4]);
cube.close();
cube.moveTo(pts[1]);
cube.lineTo(pts[3]);
cube.lineTo(pts[7]);
cube.lineTo(pts[5]);
cube.close();
cube.moveTo(pts[0]); cube.lineTo(pts[1]);
cube.moveTo(pts[2]); cube.lineTo(pts[3]);
cube.moveTo(pts[4]); cube.lineTo(pts[5]);
cube.moveTo(pts[6]); cube.lineTo(pts[7]);
canvas->drawPath(cube, paint);
{
SkPoint3 src[4] = {
{ 0, 0, 0 }, { 2, 0, 0 }, { 0, 2, 0 }, { 0, 0, 2 },
};
SkPoint dst[4];
mv.setConcat(perspective, camera);
Sk3MapPts(dst, mv, src, 4);
viewport.mapPoints(dst, 4);
const char str[] = "XYZ";
for (int i = 1; i <= 3; ++i) {
canvas->drawLine(dst[0], dst[i], paint);
}
for (int i = 1; i <= 3; ++i) {
canvas->drawText(&str[i-1], 1, dst[i].fX, dst[i].fY, paint);
}
}
fAnim->seek(fAnimT);
draw_skia(canvas, mv, viewport, fAnim.get());
}
SkISize onISize() override { return { 1024, 768 }; }
SkString onShortName() override { return SkString("3dgm"); }
bool onAnimate(const SkAnimTimer& timer) override {
if (!fAnim) {
return false;
}
SkScalar dur = fAnim->duration();
fAnimT = fmod(timer.secs(), dur) / dur;
return true;
}
bool onHandleKey(SkUnichar uni) override {
switch (uni) {
case 'a': fEye.fX += 0.125f; return true;
case 'd': fEye.fX -= 0.125f; return true;
case 'w': fEye.fY += 0.125f; return true;
case 's': fEye.fY -= 0.125f; return true;
case 'q': fEye.fZ += 0.125f; return true;
case 'z': fEye.fZ -= 0.125f; return true;
default: break;
}
return false;
}
bool onGetControls(SkMetaData*) override { return false; }
void onSetControls(const SkMetaData&) override {
}
};
DEF_GM(return new GM3d;)
#endif
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