/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.objviewer;
import android.app.Activity;
import android.content.AssetManager;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.OpenGLContext;
import android.graphics.Paint;
import android.graphics.glutils.GLView;
import android.graphics.glutils.Object3D;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import javax.microedition.khronos.opengles.GL10;
class OBJView extends View {
// Mathematical constants
private static final float PI = (float)Math.PI;
private static final float TWO_PI = (float)(2.0*Math.PI);
private static final float PI_OVER_TWO = (float)(Math.PI/2.0);
// Ambient light to apply
// private float[] lightModelAmbient = { 0.0f, 0.0f, 0.0f, 1.0f };
private float[] lightModelAmbient = { 0.2f, 0.2f, 0.2f, 1.0f };
// Paint object for drawing the FPS display
private Paint paint = new Paint();
// GLView object to manage drawing
private GLView glView = new GLView();
private boolean initialized = false;
private OpenGLContext mGLContext;
// Next time to draw
private long mNextTime;
// View transformation controlled by UI
private float mRotAngle = 0.0f;
private float mRotVelocity = 1.0f;
private float mTiltAngle = 0.0f;
// Object bounds
private float mCenterX = 0.0f;
private float mCenterY = 0.0f;
private float mCenterZ = 0.0f;
private float mScale = 1.0f;
// Light direction
private float[] mLightDir = { 0.0f, 0.0f, 1.0f, 0.0f };
public OBJView(Context context) {
super(context);
mGLContext = new OpenGLContext(OpenGLContext.DEPTH_BUFFER);
Message msg = mHandler.obtainMessage(INVALIDATE);
mNextTime = SystemClock.uptimeMillis() + 100;
mHandler.sendMessageAtTime(msg, mNextTime);
requestFocus();
}
public void reset() {
initialized = false;
mRotAngle = 0.0f;
mRotVelocity = 1.0f;
mTiltAngle = 0.0f;
mCenterX = 0.0f;
mCenterY = 0.0f;
mCenterZ = 0.0f;
mScale = 1.0f;
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
// Hand the key to the GLView object first
if (glView.processKey(keyCode)) {
return true;
}
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_LEFT:
mRotVelocity -= 1.0f;
break;
case KeyEvent.KEYCODE_DPAD_RIGHT:
mRotVelocity += 1.0f;
break;
case KeyEvent.KEYCODE_DPAD_CENTER:
mRotVelocity = 0.0f;
break;
case KeyEvent.KEYCODE_DPAD_UP:
mTiltAngle -= 360.0f/24.0f;
break;
case KeyEvent.KEYCODE_DPAD_DOWN:
mTiltAngle += 360.0f/24.0f;
break;
case KeyEvent.KEYCODE_U:
OBJViewer.nextObject();
reset();
break;
default:
return super.onKeyDown(keyCode, event);
}
return true;
}
private void init(GL10 gl) {
glView.reset();
paint.setColor(0xffffffff);
gl.glEnable(gl.GL_DEPTH_TEST);
gl.glDisable(gl.GL_SCISSOR_TEST);
// Some quality settings...
gl.glEnable(gl.GL_DITHER);
gl.glShadeModel(gl.GL_SMOOTH);
gl.glEnable(gl.GL_CULL_FACE);
gl.glFrontFace(gl.GL_CCW);
gl.glClearColor(0, 0, 0, 1);
gl.glLightModelf(gl.GL_LIGHT_MODEL_TWO_SIDE, 0);
gl.glLightModelfv(gl.GL_LIGHT_MODEL_AMBIENT, lightModelAmbient, 0);
}
@Override
protected void onDraw(Canvas canvas) {
GL10 gl = (GL10)mGLContext.getGL();
mGLContext.makeCurrent(this);
if (!initialized) {
init(gl);
initialized = true;
// Load the object
Object3D obj = OBJViewer.getObject();
// Compute a scale factor and translation to bring it
// into view
mCenterX = (obj.getBoundsMinX() + obj.getBoundsMaxX())/2.0f;
mCenterY = (obj.getBoundsMinY() + obj.getBoundsMaxY())/2.0f;
mCenterZ = (obj.getBoundsMinZ() + obj.getBoundsMaxZ())/2.0f;
float spanX = obj.getBoundsMaxX() - obj.getBoundsMinX();
float spanY = obj.getBoundsMaxY() - obj.getBoundsMinY();
float spanZ = obj.getBoundsMaxZ() - obj.getBoundsMinZ();
float maxSpan = Math.max(spanX, spanY);
maxSpan = Math.max(maxSpan, spanZ);
mScale = 2.0f/maxSpan;
}
int w = getWidth();
int h = getHeight();
gl.glViewport(0, 0, w, h);
float ratio = (float)w/h;
glView.setAspectRatio(ratio);
// Clear buffers
gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT);
// Set up the projection and view
glView.setProjection(gl);
glView.setView(gl);
// Set up lighting
gl.glMatrixMode(gl.GL_MODELVIEW);
gl.glEnable(gl.GL_LIGHTING);
gl.glEnable(gl.GL_LIGHT0);
gl.glLightfv(gl.GL_LIGHT0, gl.GL_POSITION, mLightDir, 0);
glView.setLights(gl, gl.GL_LIGHT0);
// Rotate the viewpoint around the model
gl.glRotatef(mTiltAngle, 1, 0, 0);
gl.glRotatef(mRotAngle, 0, 1, 0);
// Scale object to fit in [-1, 1]
gl.glScalef(mScale, mScale, mScale);
// Center the object at the origin
gl.glTranslatef(-mCenterX, -mCenterY, -mCenterZ);
// Increment the rotation angle
mRotAngle += mRotVelocity;
if (mRotAngle < 0.0f) {
mRotAngle += 360.0f;
}
if (mRotAngle > 360.0f) {
mRotAngle -= 360.0f;
}
// Draw the object
Object3D object = OBJViewer.getObject();
object.draw(gl);
// Allow GL to complete
mGLContext.post();
// Draw GLView messages and/or FPS
glView.showMessages(canvas);
glView.setNumTriangles(object.getNumTriangles());
glView.showStatistics(canvas, w);
}
private static final int INVALIDATE = 1;
private final Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
if (msg.what == INVALIDATE) {
invalidate();
msg = obtainMessage(INVALIDATE);
long current = SystemClock.uptimeMillis();
if (mNextTime < current) {
mNextTime = current + 20;
}
sendMessageAtTime(msg, mNextTime);
mNextTime += 20;
}
}
};
}
public class OBJViewer extends Activity {
private static Object3D object = null;
private static List<String> objectFiles = new ArrayList<String>();
private static int objectIndex = 0;
static {
objectFiles.add("world.gles");
objectFiles.add("al.gles");
objectFiles.add("apple.gles");
objectFiles.add("dolphins.gles");
objectFiles.add("f16.gles");
objectFiles.add("flowers.gles");
objectFiles.add("porsche.gles");
objectFiles.add("rosevase.gles");
objectFiles.add("shuttle.gles");
objectFiles.add("soccerball.gles");
}
private int readInt16(InputStream is) throws Exception {
return is.read() | (is.read() << 8);
}
public static Object3D getObject() {
return object;
}
public static void nextObject() {
try {
objectIndex = (objectIndex + 1) % objectFiles.size();
object.load(objectFiles.get(objectIndex));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
// Get rid of the title
requestWindowFeature(Window.FEATURE_NO_TITLE);
// Make sure we're not drawing a background
setTheme(R.style.Theme);
setContentView(new OBJView((Context)getApplication()));
if (object == null) {
try {
final AssetManager am = getAssets();
this.object = new Object3D() {
public InputStream readFile(String filename)
throws IOException {
return am.open(filename);
}
};
object.load(objectFiles.get(0));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
@Override protected void onResume() {
super.onResume();
}
@Override protected void onStop() {
super.onStop();
}
}