1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.objviewer;
18
19import android.app.Activity;
20import android.content.AssetManager;
21import android.content.Context;
22import android.graphics.Canvas;
23import android.graphics.OpenGLContext;
24import android.graphics.Paint;
25import android.graphics.glutils.GLView;
26import android.graphics.glutils.Object3D;
27import android.os.Bundle;
28import android.os.Handler;
29import android.os.Message;
30import android.os.SystemClock;
31import android.view.KeyEvent;
32import android.view.View;
33import android.view.Window;
34
35import java.io.IOException;
36import java.io.InputStream;
37import java.util.ArrayList;
38import java.util.List;
39
40import javax.microedition.khronos.opengles.GL10;
41
42class OBJView extends View {
43
44    // Mathematical constants
45    private static final float PI = (float)Math.PI;
46    private static final float TWO_PI = (float)(2.0*Math.PI);
47    private static final float PI_OVER_TWO = (float)(Math.PI/2.0);
48
49    // Ambient light to apply
50    // private float[] lightModelAmbient = { 0.0f, 0.0f, 0.0f, 1.0f };
51    private float[] lightModelAmbient = { 0.2f, 0.2f, 0.2f, 1.0f };
52
53    // Paint object for drawing the FPS display
54    private Paint paint = new Paint();
55
56    // GLView object to manage drawing
57    private GLView glView = new GLView();
58
59    private boolean         initialized = false;
60
61    private OpenGLContext   mGLContext;
62
63    // Next time to draw
64    private long            mNextTime;
65
66    // View transformation controlled by UI
67    private float           mRotAngle = 0.0f;
68    private float           mRotVelocity = 1.0f;
69    private float           mTiltAngle = 0.0f;
70
71    // Object bounds
72    private float           mCenterX = 0.0f;
73    private float           mCenterY = 0.0f;
74    private float           mCenterZ = 0.0f;
75    private float           mScale   = 1.0f;
76
77    // Light direction
78    private float[] mLightDir = { 0.0f, 0.0f, 1.0f, 0.0f };
79
80    public OBJView(Context context) {
81        super(context);
82
83        mGLContext = new OpenGLContext(OpenGLContext.DEPTH_BUFFER);
84
85        Message msg = mHandler.obtainMessage(INVALIDATE);
86        mNextTime = SystemClock.uptimeMillis() + 100;
87        mHandler.sendMessageAtTime(msg, mNextTime);
88
89        requestFocus();
90    }
91
92    public void reset() {
93        initialized = false;
94
95        mRotAngle = 0.0f;
96        mRotVelocity = 1.0f;
97        mTiltAngle = 0.0f;
98
99        mCenterX = 0.0f;
100        mCenterY = 0.0f;
101        mCenterZ = 0.0f;
102        mScale   = 1.0f;
103    }
104
105    public boolean onKeyDown(int keyCode, KeyEvent event) {
106        // Hand the key to the GLView object first
107        if (glView.processKey(keyCode)) {
108            return true;
109        }
110
111        switch (keyCode) {
112            case KeyEvent.KEYCODE_DPAD_LEFT:
113                mRotVelocity -= 1.0f;
114                break;
115
116            case KeyEvent.KEYCODE_DPAD_RIGHT:
117                mRotVelocity += 1.0f;
118                break;
119
120            case KeyEvent.KEYCODE_DPAD_CENTER:
121                mRotVelocity = 0.0f;
122                break;
123
124            case KeyEvent.KEYCODE_DPAD_UP:
125                mTiltAngle -= 360.0f/24.0f;
126                break;
127
128            case KeyEvent.KEYCODE_DPAD_DOWN:
129                mTiltAngle += 360.0f/24.0f;
130                break;
131
132            case KeyEvent.KEYCODE_U:
133                OBJViewer.nextObject();
134                reset();
135                break;
136
137            default:
138                return super.onKeyDown(keyCode, event);
139        }
140
141        return true;
142    }
143
144    private void init(GL10 gl) {
145        glView.reset();
146
147        paint.setColor(0xffffffff);
148
149        gl.glEnable(gl.GL_DEPTH_TEST);
150
151        gl.glDisable(gl.GL_SCISSOR_TEST);
152
153        // Some quality settings...
154        gl.glEnable(gl.GL_DITHER);
155
156        gl.glShadeModel(gl.GL_SMOOTH);
157
158        gl.glEnable(gl.GL_CULL_FACE);
159        gl.glFrontFace(gl.GL_CCW);
160
161        gl.glClearColor(0, 0, 0, 1);
162
163        gl.glLightModelf(gl.GL_LIGHT_MODEL_TWO_SIDE, 0);
164        gl.glLightModelfv(gl.GL_LIGHT_MODEL_AMBIENT, lightModelAmbient, 0);
165    }
166
167    @Override
168    protected void onDraw(Canvas canvas) {
169        GL10 gl = (GL10)mGLContext.getGL();
170        mGLContext.makeCurrent(this);
171
172        if (!initialized) {
173            init(gl);
174            initialized = true;
175
176            // Load the object
177            Object3D obj = OBJViewer.getObject();
178
179            // Compute a scale factor and translation to bring it
180            // into view
181            mCenterX = (obj.getBoundsMinX() + obj.getBoundsMaxX())/2.0f;
182            mCenterY = (obj.getBoundsMinY() + obj.getBoundsMaxY())/2.0f;
183            mCenterZ = (obj.getBoundsMinZ() + obj.getBoundsMaxZ())/2.0f;
184            float spanX = obj.getBoundsMaxX() - obj.getBoundsMinX();
185            float spanY = obj.getBoundsMaxY() - obj.getBoundsMinY();
186            float spanZ = obj.getBoundsMaxZ() - obj.getBoundsMinZ();
187            float maxSpan = Math.max(spanX, spanY);
188            maxSpan = Math.max(maxSpan, spanZ);
189            mScale = 2.0f/maxSpan;
190        }
191
192        int w = getWidth();
193        int h = getHeight();
194        gl.glViewport(0, 0, w, h);
195
196        float ratio = (float)w/h;
197        glView.setAspectRatio(ratio);
198
199        // Clear buffers
200        gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT);
201
202        // Set up the projection and view
203        glView.setProjection(gl);
204        glView.setView(gl);
205
206        // Set up lighting
207        gl.glMatrixMode(gl.GL_MODELVIEW);
208        gl.glEnable(gl.GL_LIGHTING);
209        gl.glEnable(gl.GL_LIGHT0);
210        gl.glLightfv(gl.GL_LIGHT0, gl.GL_POSITION, mLightDir, 0);
211        glView.setLights(gl, gl.GL_LIGHT0);
212
213        // Rotate the viewpoint around the model
214        gl.glRotatef(mTiltAngle, 1, 0, 0);
215        gl.glRotatef(mRotAngle, 0, 1, 0);
216
217        // Scale object to fit in [-1, 1]
218        gl.glScalef(mScale, mScale, mScale);
219
220        // Center the object at the origin
221        gl.glTranslatef(-mCenterX, -mCenterY, -mCenterZ);
222
223        // Increment the rotation angle
224        mRotAngle += mRotVelocity;
225        if (mRotAngle < 0.0f) {
226            mRotAngle += 360.0f;
227        }
228        if (mRotAngle > 360.0f) {
229            mRotAngle -= 360.0f;
230        }
231
232        // Draw the object
233        Object3D object = OBJViewer.getObject();
234        object.draw(gl);
235
236        // Allow GL to complete
237        mGLContext.post();
238
239        // Draw GLView messages and/or FPS
240        glView.showMessages(canvas);
241        glView.setNumTriangles(object.getNumTriangles());
242        glView.showStatistics(canvas, w);
243    }
244
245    private static final int INVALIDATE = 1;
246
247    private final Handler mHandler = new Handler() {
248        public void handleMessage(Message msg) {
249            if (msg.what == INVALIDATE) {
250                invalidate();
251                msg = obtainMessage(INVALIDATE);
252                long current = SystemClock.uptimeMillis();
253                if (mNextTime < current) {
254                    mNextTime = current + 20;
255                }
256                sendMessageAtTime(msg, mNextTime);
257                mNextTime += 20;
258            }
259        }
260    };
261}
262
263
264public class OBJViewer extends Activity {
265
266    private static Object3D object = null;
267
268    private static List<String> objectFiles = new ArrayList<String>();
269    private static int objectIndex = 0;
270
271    static {
272        objectFiles.add("world.gles");
273        objectFiles.add("al.gles");
274        objectFiles.add("apple.gles");
275        objectFiles.add("dolphins.gles");
276        objectFiles.add("f16.gles");
277        objectFiles.add("flowers.gles");
278        objectFiles.add("porsche.gles");
279        objectFiles.add("rosevase.gles");
280        objectFiles.add("shuttle.gles");
281        objectFiles.add("soccerball.gles");
282    }
283
284    private int readInt16(InputStream is) throws Exception {
285        return is.read() | (is.read() << 8);
286    }
287
288    public static Object3D getObject() {
289        return object;
290    }
291
292    public static void nextObject() {
293        try {
294            objectIndex = (objectIndex + 1) % objectFiles.size();
295            object.load(objectFiles.get(objectIndex));
296        } catch (IOException e) {
297            throw new RuntimeException(e);
298        }
299    }
300
301    @Override protected void onCreate(Bundle icicle) {
302        super.onCreate(icicle);
303
304        // Get rid of the title
305        requestWindowFeature(Window.FEATURE_NO_TITLE);
306        // Make sure we're not drawing a background
307        setTheme(R.style.Theme);
308        setContentView(new OBJView((Context)getApplication()));
309
310        if (object == null) {
311            try {
312                final AssetManager am = getAssets();
313                this.object = new Object3D() {
314                    public InputStream readFile(String filename)
315                    throws IOException {
316                        return am.open(filename);
317
318                    }
319                };
320                object.load(objectFiles.get(0));
321            } catch (Exception e) {
322                throw new RuntimeException(e);
323            }
324        }
325    }
326
327    @Override protected void onResume() {
328        super.onResume();
329    }
330
331    @Override protected void onStop() {
332        super.onStop();
333    }
334}
335