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Unified Diff: samplecode/SampleLitAtlas.cpp

Issue 2026393005: Add SampleApp slide with animating lightmapped objects & transparency (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: ... Created 4 years, 7 months ago
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« include/core/SkLights.h ('K') | « include/core/SkLights.h ('k') | no next file » | no next file with comments »
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Index: samplecode/SampleLitAtlas.cpp
diff --git a/samplecode/SampleLitAtlas.cpp b/samplecode/SampleLitAtlas.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f11bf4863e0e9f5649f2dabc11093a97d4a78596
--- /dev/null
+++ b/samplecode/SampleLitAtlas.cpp
@@ -0,0 +1,462 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SampleCode.h"
+#include "SkAnimTimer.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkDrawable.h"
+#include "SkLights.h"
egdaniel 2016/06/03 15:52:48 nit: flip Lights and Lighting in alpha order here
robertphillips 2016/06/03 16:35:31 Done.
+#include "SkLightingShader.h"
+#include "SkRandom.h"
+#include "SkRSXform.h"
+
+#include "sk_tool_utils.h"
+
+class DrawLitAtlasDrawable : public SkDrawable {
+public:
+ DrawLitAtlasDrawable(const SkRect& r)
+ : fBounds(r)
+ , fUseColors(false) {
+ fAtlas = MakeAtlas();
+
+ SkRandom rand;
+ for (int i = 0; i < kNumAsteroids; ++i) {
+ fAsteroids[i].initAsteroid(&rand, fBounds, &fDiffTex[i], &fNormTex[i]);
+ }
+
+ fShip.initShip(fBounds, &fDiffTex[kNumAsteroids], &fNormTex[kNumAsteroids]);
+
+ SkLights::Builder builder;
+
+ builder.add(SkLights::Light(SkColor3f::Make(1.0f, 1.0f, 1.0f),
+ SkVector3::Make(1.0f, 0.0f, 0.0f)));
+ builder.add(SkLights::Light(SkColor3f::Make(0.2f, 0.2f, 0.2f)));
+
+ fLights = builder.finish();
+ }
+
+ void toggleUseColors() {
+ fUseColors = !fUseColors;
+ }
+
+ void left() {
+ SkScalar newRot = SkScalarMod(fShip.rot() + (2*SK_ScalarPI - SK_ScalarPI/32.0f),
+ 2 * SK_ScalarPI);
+ fShip.setRot(newRot);
+ }
+
+ void right() {
+ SkScalar newRot = SkScalarMod(fShip.rot() + SK_ScalarPI/32.0f, 2 * SK_ScalarPI);
+ fShip.setRot(newRot);
+ }
+
+ void thrust() {
+ SkScalar c;
+ SkScalar s = SkScalarSinCos(fShip.rot(), &c);
+
+ SkVector newVel = fShip.velocity();
+ newVel.fX = s;
+ newVel.fY = -c;
egdaniel 2016/06/03 15:52:48 DON' NEED TO CHANGE: You might want to consider ca
robertphillips 2016/06/03 16:35:31 Done.
+
+ fShip.setVelocity(newVel);
+ }
+
+protected:
+ void onDraw(SkCanvas* canvas) override {
+ SkRSXform xforms[kNumAsteroids+kNumShips];
+ SkColor colors[kNumAsteroids+kNumShips];
+
+ for (int i = 0; i < kNumAsteroids; ++i) {
+ fAsteroids[i].advance(fBounds);
+ xforms[i] = fAsteroids[i].asRSXform();
+ if (fUseColors) {
+ colors[i] = SkColorSetARGB(0xFF, 0xFF, 0xFF, 0xFF);
+ }
+ }
+
+ fShip.advance(fBounds);
+ xforms[kNumAsteroids] = fShip.asRSXform();
+ if (fUseColors) {
+ colors[kNumAsteroids] = SkColorSetARGB(0xFF, 0xFF, 0xFF, 0xFF);
+ }
+
+#ifdef SK_DEBUG
+ canvas->drawBitmap(fAtlas, 0, 0); // just to see the atlas
+#endif
+
+#if 0
+ // TODO: revitalize when drawLitAtlas API lands
+ SkPaint paint;
+ paint.setFilterQuality(kLow_SkFilterQuality);
+
+ const SkRect cull = this->getBounds();
+ const SkColor* colorsPtr = fUseColors ? colors : NULL;
+
+ canvas->drawLitAtlas(fAtlas, xforms, fDiffTex, fNormTex, colorsPtr, kNumAsteroids+1,
+ SkXfermode::kModulate_Mode, &cull, &paint, fLights);
+#else
+ SkMatrix diffMat, normalMat;
+
+ for (int i = 0; i < kNumAsteroids+1; ++i) {
+ colors[i] = colors[i] & 0xFF000000; // to silence compilers
+ SkPaint paint;
+
+ SkRect r = fDiffTex[i];
+ r.offsetTo(0, 0);
+
+ diffMat.setRectToRect(fDiffTex[i], r, SkMatrix::kFill_ScaleToFit);
+ normalMat.setRectToRect(fNormTex[i], r, SkMatrix::kFill_ScaleToFit);
+
+ SkMatrix m;
+ m.setRSXform(xforms[i]);
+
+ // TODO: correctly pull out the pure rotation
+ SkVector invNormRotation = { m[SkMatrix::kMScaleX], m[SkMatrix::kMSkewY] };
+
+ paint.setShader(SkLightingShader::Make(fAtlas, fAtlas, fLights,
+ invNormRotation, &diffMat, &normalMat));
+
+ canvas->save();
+ canvas->setMatrix(m);
+ canvas->drawRect(r, paint);
+ canvas->restore();
+ }
+#endif
+
+#ifdef SK_DEBUG
+ {
+ SkPaint paint;
+ paint.setColor(SK_ColorRED);
+
+ for (int i = 0; i < kNumAsteroids; ++i) {
+ canvas->drawCircle(fAsteroids[i].pos().x(), fAsteroids[i].pos().y(), 2, paint);
+ }
+ canvas->drawCircle(fShip.pos().x(), fShip.pos().y(), 2, paint);
+
+ paint.setStyle(SkPaint::kStroke_Style);
+ canvas->drawRect(this->getBounds(), paint);
+ }
+#endif
+ }
+
+ SkRect onGetBounds() override {
+ return fBounds;
+ }
+
+private:
+
+ enum ObjType {
+ kBigAsteroid_ObjType = 0,
+ kMedAsteroid_ObjType,
+ kSmAsteroid_ObjType,
+ kShip_ObjType,
+
+ kLast_ObjType = kShip_ObjType
+ };
+
+ static const int kObjTypeCount = kLast_ObjType + 1;
+
+ // Create the mixed diffuse & normal atlas
+ //
+ // big color circle | big normal hemi
+ // ------------------------------------
+ // med color circle | med normal pyra
+ // ------------------------------------
+ // sm color circle | sm normal hemi
+ // ------------------------------------
+ // big ship | big tetra normal
+ static SkBitmap MakeAtlas() {
+
+ SkBitmap atlas;
+ atlas.allocN32Pixels(kAtlasWidth, kAtlasHeight);
+
+ for (int y = 0; y < kAtlasHeight; ++y) {
+ int x = 0;
+ for ( ; x < kBigSize+kPad; ++x) {
+ *atlas.getAddr32(x, y) = SK_ColorTRANSPARENT;
+ }
+ for ( ; x < kAtlasWidth; ++x) {
+ *atlas.getAddr32(x, y) = SkPackARGB32(0xFF, 0x88, 0x88, 0xFF);
+ }
+ }
+
+ // big asteroid
+ {
+ SkPoint bigCenter = SkPoint::Make(kDiffXOff + kBigSize/2.0f, kBigYOff + kBigSize/2.0f);
+
+ for (int y = kBigYOff; y < kBigYOff+kBigSize; ++y) {
+ for (int x = kDiffXOff; x < kDiffXOff+kBigSize; ++x) {
+ SkScalar distSq = (x - bigCenter.fX) * (x - bigCenter.fX) +
+ (y - bigCenter.fY) * (y - bigCenter.fY);
+ if (distSq > kBigSize*kBigSize/4.0f) {
+ *atlas.getAddr32(x, y) = SkPreMultiplyARGB(0, 0, 0, 0);
+ } else {
+ *atlas.getAddr32(x, y) = SkPackARGB32(0xFF, 0xFF, 0, 0);
+ }
+ }
+ }
+
+ sk_tool_utils::create_hemi_normal_map(&atlas,
+ SkIRect::MakeXYWH(kNormXOff, kBigYOff,
+ kBigSize, kBigSize));
+ }
+
+ // medium asteroid
+ {
+ for (int y = kMedYOff; y < kMedYOff+kMedSize; ++y) {
+ for (int x = kDiffXOff; x < kDiffXOff+kMedSize; ++x) {
+ *atlas.getAddr32(x, y) = SkPackARGB32(0xFF, 0, 0xFF, 0);
+ }
+ }
+
+ sk_tool_utils::create_frustum_normal_map(&atlas,
+ SkIRect::MakeXYWH(kNormXOff, kMedYOff,
+ kMedSize, kMedSize));
+ }
+
+ // small asteroid
+ {
+ SkPoint smCenter = SkPoint::Make(kDiffXOff + kSmSize/2.0f, kSmYOff + kSmSize/2.0f);
+
+ for (int y = kSmYOff; y < kSmYOff+kSmSize; ++y) {
+ for (int x = kDiffXOff; x < kDiffXOff+kSmSize; ++x) {
+ SkScalar distSq = (x - smCenter.fX) * (x - smCenter.fX) +
+ (y - smCenter.fY) * (y - smCenter.fY);
+ if (distSq > kSmSize*kSmSize/4.0f) {
+ *atlas.getAddr32(x, y) = SkPreMultiplyARGB(0, 0, 0, 0);
+ } else {
+ *atlas.getAddr32(x, y) = SkPackARGB32(0xFF, 0, 0, 0xFF);
+ }
+ }
+ }
+
+ sk_tool_utils::create_hemi_normal_map(&atlas,
+ SkIRect::MakeXYWH(kNormXOff, kSmYOff,
+ kSmSize, kSmSize));
+ }
+
+ // ship
+ {
+ SkScalar shipMidLine = kDiffXOff + kMedSize/2.0f;
+
+ for (int y = kShipYOff; y < kShipYOff+kMedSize; ++y) {
+ SkScalar scaledY = (y - kShipYOff)/(float)kMedSize; // 0..1
+
+ for (int x = kDiffXOff; x < kDiffXOff+kMedSize; ++x) {
+ SkScalar scaledX;
+
+ if (x < shipMidLine) {
+ scaledX = 1.0f - (x - kDiffXOff)/(kMedSize/2.0f); // 0..1
+ } else {
+ scaledX = (x - shipMidLine)/(kMedSize/2.0f); // 0..1
+ }
+
+ if (scaledX < scaledY) {
+ *atlas.getAddr32(x, y) = SkPackARGB32(0xFF, 0, 0xFF, 0xFF);
+ } else {
+ *atlas.getAddr32(x, y) = SkPackARGB32(0, 0, 0, 0);
+ }
+ }
+ }
+
+ sk_tool_utils::create_tetra_normal_map(&atlas,
+ SkIRect::MakeXYWH(kNormXOff, kShipYOff,
+ kMedSize, kMedSize));
+ }
+
+ return atlas;
+ }
+
+ class ObjectRecord {
+ public:
+ void initAsteroid(SkRandom *rand, const SkRect& bounds,
+ SkRect* diffTex, SkRect* normTex) {
+ static const SkScalar gMaxSpeeds[3] = { 1, 2, 5 }; // smaller asteroids can go faster
+ static const SkScalar gYOffs[3] = { kBigYOff, kMedYOff, kSmYOff };
+ static const SkScalar gSizes[3] = { kBigSize, kMedSize, kSmSize };
+
+ static unsigned int asteroidType = 0;
+ fObjType = static_cast<ObjType>(asteroidType++ % 3);
+
+ fPosition.set(bounds.fLeft + rand->nextUScalar1() * bounds.width(),
+ bounds.fTop + rand->nextUScalar1() * bounds.height());
+ fVelocity.fX = rand->nextSScalar1();
+ fVelocity.fY = sqrt(1.0f - fVelocity.fX * fVelocity.fX);
+ SkASSERT(SkScalarNearlyEqual(fVelocity.length(), 1.0f));
+ fVelocity *= gMaxSpeeds[fObjType];
+ fRot = 0;
+ fDeltaRot = rand->nextSScalar1() / 32;
+
+ diffTex->setXYWH(SkIntToScalar(kDiffXOff), gYOffs[fObjType],
+ gSizes[fObjType], gSizes[fObjType]);
+ normTex->setXYWH(SkIntToScalar(kNormXOff), gYOffs[fObjType],
+ gSizes[fObjType], gSizes[fObjType]);
+ }
+
+ void initShip(const SkRect& bounds, SkRect* diffTex, SkRect* normTex) {
+ fObjType = kShip_ObjType;
+ fPosition.set(bounds.centerX(), bounds.centerY());
+ fVelocity = SkVector::Make(0.0f, 0.0f);
+ fRot = 0.0f;
+ fDeltaRot = 0.0f;
+
+ diffTex->setXYWH(SkIntToScalar(kDiffXOff), SkIntToScalar(kShipYOff),
+ SkIntToScalar(kMedSize), SkIntToScalar(kMedSize));
+ normTex->setXYWH(SkIntToScalar(kNormXOff), SkIntToScalar(kShipYOff),
+ SkIntToScalar(kMedSize), SkIntToScalar(kMedSize));
+ }
+
+ void advance(const SkRect& bounds) {
+ fPosition += fVelocity;
+ if (fPosition.fX > bounds.right()) {
+ SkASSERT(fVelocity.fX > 0);
+ fVelocity.fX = -fVelocity.fX;
+ } else if (fPosition.fX < bounds.left()) {
+ SkASSERT(fVelocity.fX < 0);
+ fVelocity.fX = -fVelocity.fX;
+ }
+ if (fPosition.fY > bounds.bottom()) {
+ if (fVelocity.fY > 0) {
+ fVelocity.fY = -fVelocity.fY;
+ }
+ } else if (fPosition.fY < bounds.top()) {
+ if (fVelocity.fY < 0) {
+ fVelocity.fY = -fVelocity.fY;
+ }
+ }
+
+ fRot += fDeltaRot;
+ fRot = SkScalarMod(fRot, 2 * SK_ScalarPI);
+ }
+
+ const SkPoint& pos() const { return fPosition; }
+
+ SkScalar rot() const { return fRot; }
+ void setRot(SkScalar rot) { fRot = rot; }
+
+ const SkPoint& velocity() const { return fVelocity; }
+ void setVelocity(const SkPoint& velocity) { fVelocity = velocity; }
+
+ SkRSXform asRSXform() const {
+ static const SkScalar gHalfSizes[kObjTypeCount] = {
+ SkScalarHalf(kBigSize),
+ SkScalarHalf(kMedSize),
+ SkScalarHalf(kSmSize),
+ SkScalarHalf(kMedSize),
+ };
+
+ return SkRSXform::MakeFromRadians(1.0f, fRot, fPosition.x(), fPosition.y(),
+ gHalfSizes[fObjType],
+ gHalfSizes[fObjType]);
+ }
+
+ private:
+ ObjType fObjType;
+ SkPoint fPosition;
+ SkVector fVelocity;
+ SkScalar fRot; // In radians.
+ SkScalar fDeltaRot; // In radiands. Not used by ship.
+ };
+
+
+
+
+private:
+ static const int kNumLights = 2;
+ static const int kNumAsteroids = 6;
+ static const int kNumShips = 1;
+
+ static const int kBigSize = 128;
+ static const int kMedSize = 64;
+ static const int kSmSize = 32;
+ static const int kPad = 1;
+ static const int kAtlasWidth = kBigSize + kBigSize + 2 * kPad; // 2 pads in the middle
+ static const int kAtlasHeight = kBigSize + kMedSize + kSmSize + kMedSize + 3 * kPad;
+
+ static const int kDiffXOff = 0;
+ static const int kNormXOff = kBigSize + 2 * kPad;
+
+ static const int kBigYOff = 0;
+ static const int kMedYOff = kBigSize + kPad;
+ static const int kSmYOff = kMedYOff + kMedSize + kPad;
+ static const int kShipYOff = kSmYOff + kSmSize + kPad;
+
+ SkBitmap fAtlas;
+ ObjectRecord fAsteroids[kNumAsteroids];
+ ObjectRecord fShip;
+ SkRect fDiffTex[kNumAsteroids+kNumShips];
+ SkRect fNormTex[kNumAsteroids+kNumShips];
+ SkRect fBounds;
+ bool fUseColors;
+ sk_sp<SkLights> fLights;
+
+ typedef SkDrawable INHERITED;
+};
+
+class DrawLitAtlasView : public SampleView {
+public:
+ DrawLitAtlasView()
+ : fDrawable(new DrawLitAtlasDrawable(SkRect::MakeWH(640, 480))) {
+ }
+
+protected:
+ bool onQuery(SkEvent* evt) override {
+ if (SampleCode::TitleQ(*evt)) {
+ SampleCode::TitleR(evt, "DrawLitAtlas");
+ return true;
+ }
+ SkUnichar uni;
+ if (SampleCode::CharQ(*evt, &uni)) {
+ switch (uni) {
+ case 'C':
+ fDrawable->toggleUseColors();
+ this->inval(NULL);
+ return true;
+ case 'j':
+ fDrawable->left();
+ this->inval(NULL);
+ return true;
+ case 'k':
+ fDrawable->thrust();
+ this->inval(NULL);
+ return true;
+ case 'l':
+ fDrawable->right();
+ this->inval(NULL);
+ return true;
+ default:
+ break;
+ }
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ void onDrawContent(SkCanvas* canvas) override {
+ canvas->drawDrawable(fDrawable);
+ this->inval(NULL);
+ }
+
+#if 0
+ // TODO: switch over to use this for our animation
+ bool onAnimate(const SkAnimTimer& timer) override {
+ SkScalar angle = SkDoubleToScalar(fmod(timer.secs() * 360 / 24, 360));
+ fAnimatingDrawable->setSweep(angle);
+ return true;
+ }
+#endif
+
+private:
+ SkAutoTUnref<DrawLitAtlasDrawable> fDrawable;
+
+ typedef SampleView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new DrawLitAtlasView; }
+static SkViewRegister reg(MyFactory);
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