android系统下使用openGL开发demo

feiyang10086

android系统下使用openGL开发demo

对openGL早有耳闻，但是刚接触android下的opengl,做个demo学习下，


先把opengl的框架搭建起来:只要有如下几个文件，


openActivity.java     ----作为启动入口,android通过GLSurfaceView显示openGL试图，而GLSurfaceView提供了专门渲染3D的Renderer接口

GLRender.java ----渲染图形



GLImage.java  ----获取资源文件


GLRender.java  实现Renderer接口：只要实现如下方法：

1. public void onDrawFrame(GL10 gl); //进行图形的绘制
   
2. 
   
3. public void onSurfaceChanged(GL10 gl, int width, int height);
   
4. 
   
5. public void onSurfaceCreated(GL10 gl, EGLConfig config);
   
6. 
   
7. 
   
8. GLRender.java 代码如下：
   
9. package com.aurora.android.render;
   
10. 
    
11. import java.nio.ByteBuffer;
    
12. import java.nio.IntBuffer;
    
13. import java.util.Random;
    
14. 
    
15. import javax.microedition.khronos.egl.EGLConfig;
    
16. import javax.microedition.khronos.opengles.GL10;
    
17. 
    
18. import com.aurora.android.model.GLImage;
    
19. import com.aurora.android.model.Star;
    
20. 
    
21. 
    
22. import android.opengl.GLUtils;
    
23. import android.opengl.GLSurfaceView.Renderer;
    
24. import android.view.KeyEvent;
    
25. 
    
26. public class GLRender implements Renderer {
    
27. 
    
28. public static final int num = 50;
    
29. public Star[] star = new Star[num];
    
30. Random random = new Random();
    
31. boolean key;
    
32. boolean twinkle = true;
    
33. float spin;
    
34. float zoom = -10.0f;
    
35. float tilt = 90.0f;
    
36. int texture;
    
37. 
    
38. int one = 0x10000;
    
39. 
    
40.         //纹理数据
    
41. IntBuffer coords = IntBuffer.wrap(new int[] {
    
42. 0, 0,
    
43. one, 0,
    
44. one, one,
    
45. 0,one });
    
46. 
    
47. IntBuffer vertexs = IntBuffer.wrap(new int[] {
    
48. -one, -one, 0,
    
49. one, -one, 0,
    
50. one, one, 0,
    
51. -one, one, 0 });
    
52. 
    
53. ByteBuffer indices = ByteBuffer.wrap(new byte[] {
    
54. 1, 0, 2, 3
    
55. });
    
56. 
    
57. @Override
    
58. public void onDrawFrame(GL10 gl) {
    
59. // TODO Auto-generated method stub
    
60. 
    
61. gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
    
62. gl.glBindTexture(GL10.GL_TEXTURE_2D, texture);//绑定纹理
    
63. 
    
64. for (int i = 0; i < num; i++) {
    
65. gl.glLoadIdentity();
    
66. 
    
67. gl.glTranslatef(0.0f, 0.0f, zoom);
    
68. gl.glRotatef(tilt, 1.0f, 0.0f, 0.0f);
    
69. gl.glRotatef(star[i].angle, 0.0f, 1.0f, 0.0f);
    
70. gl.glTranslatef(star[i].dist, 0.0f, 0.0f);
    
71. gl.glRotatef(-star[i].angle, 0.0f, 1.0f, 0.0f);
    
72. gl.glRotatef(-tilt, 1.0f, 0.0f, 0.0f);
    
73. 
    
74. gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);//启用顶点
    
75. gl.glEnableClientState(GL10.GL_COLOR_ARRAY);//启用着色
    
76. gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);//启用纹理
    
77. 
    
78. if (twinkle) {//启用星星闪烁效果
    
79.                                 //使用byte型数值指定一颜色
    
80. gl.glColor4f((float) star[(num - i) - 1].r / 255.0f,
    
81. (float) star[(num - i) - 1].g / 255.0f,
    
82. (float) star[(num - i) - 1].b / 255.0f, 1.0f);
    
83. gl.glVertexPointer(3, GL10.GL_FIXED, 0, vertexs);
    
84. gl.glTexCoordPointer(2, GL10.GL_FIXED, 0, coords);
    
85. 
    
86. {
    
87. coords.position(0);
    
88. vertexs.position(0);
    
89. indices.position(0);
    
90.                                         //绘图
    
91. gl.glDrawElements(GL10.GL_TRIANGLE_STRIP, 4,
    
92. GL10.GL_UNSIGNED_BYTE, indices);
    
93. 
    
94. }
    
95.                                 //闪烁星星绘制完成
    
96. gl.glFinish();
    
97. }
    
98.                         //绕z轴旋转
    
99. gl.glRotatef(spin, 0.0f, 0.0f, 1.0f);
    
100. 
     
101. gl.glColor4f((float) star[(num - i) - 1].r / 255.0f,
     
102. (float) star[(num - i) - 1].g / 255.0f,
     
103. (float) star[(num - i) - 1].b / 255.0f, 1.0f);
     
104. gl.glVertexPointer(3, GL10.GL_FIXED, 0, vertexs);
     
105. gl.glTexCoordPointer(2, GL10.GL_FIXED, 0, coords);
     
106. 
     
107. {
     
108. coords.position(0);
     
109. vertexs.position(0);
     
110. indices.position(0);
     
111. 
     
112. gl.glDrawElements(GL10.GL_TRIANGLE_STRIP, 4,
     
113. GL10.GL_UNSIGNED_BYTE, indices);
     
114. 
     
115. }
     
116. gl.glFinish();
     
117. 
     
118. gl.glDisableClientState(GL10.GL_COLOR_ARRAY);
     
119. gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
     
120. gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
     
121. 
     
122. spin += 0.01f;
     
123. star[i].angle += (float) (i) / (float) num;
     
124. star[i].dist -= 0.01f;
     
125. if (star[i].dist < 0.0f) {
     
126. star[i].dist += 5.0f;
     
127. star[i].r = random.nextInt(256);
     
128. star[i].g = random.nextInt(256);
     
129. star[i].b = random.nextInt(256);
     
130. }
     
131. }
     
132. 
     
133. }
     
134. 
     
135. @Override
     
136. public void onSurfaceChanged(GL10 gl, int width, int height) {
     
137. // TODO Auto-generated method stub
     
138. float ratio = (float) width / height;
     
139. gl.glViewport(0, 0, width, height);// 设置场景大小
     
140. gl.glMatrixMode(GL10.GL_PROJECTION);// 设置投影矩阵
     
141. gl.glLoadIdentity();
     
142. gl.glFrustumf(-ratio, ratio, -1, 1, 1, 10);// 设置视口大小
     
143. gl.glMatrixMode(GL10.GL_MODELVIEW);// 设置观察模式
     
144. gl.glLoadIdentity();
     
145. }
     
146. 
     
147. @Override
     
148. public void onSurfaceCreated(GL10 gl, EGLConfig config) {
     
149. // TODO Auto-generated method stub
     
150. 
     
151. gl.glShadeModel(GL10.GL_SMOOTH);// 启用平滑
     
152. gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);// 设置黑背景
     
153. gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST);// 精细的透视修正
     
154. 
     
155. IntBuffer intBuffer = IntBuffer.allocate(1);
     
156. gl.glGenTextures(1, intBuffer);
     
157. texture = intBuffer.get();
     
158. 
     
159. gl.glBindTexture(GL10.GL_TEXTURE_2D, texture);
     
160. gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER,
     
161. GL10.GL_LINEAR);
     
162. gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER,
     
163. GL10.GL_LINEAR);
     
164. GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, GLImage.mBitmap, 0);
     
165. 
     
166. gl.glEnable(GL10.GL_TEXTURE_2D);// 设置纹理
     
167. gl.glShadeModel(GL10.GL_SMOOTH);// 启用平滑
     
168. gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);// 设置黑背景
     
169. gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST);// 精细的透视修正
     
170. gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE);// 设置混合函数取半透明
     
171. gl.glEnable(GL10.GL_BLEND);// 设置混色
     
172. 
     
173. for (int i = 0; i < num; i++) {
     
174. 
     
175. Star starTemp = new Star();
     
176. starTemp.angle = 0.0f;
     
177. starTemp.dist = ((float) (i) / (float) num) * 5.0f;
     
178. 
     
179. starTemp.r = random.nextInt(256);
     
180. starTemp.g = random.nextInt(256);
     
181. starTemp.b = random.nextInt(256);
     
182. star[i] = starTemp;
     
183. 
     
184. }
     
185. }
     
186. 
     
187. public boolean onKeyUp(int keyCode, KeyEvent event) {
     
188. twinkle = !twinkle;
     
189. return false;
     
190. }
     
191. }
     
192. 
     
193. openActivity.java代码如下:
     
194. package com.aurora.android.advanced;
     
195. 
     
196. import com.aurora.android.model.GLImage;
     
197. import com.aurora.android.render.GLRender;
     
198. 
     
199. import android.app.Activity;
     
200. import android.opengl.GLSurfaceView;
     
201. import android.os.Bundle;
     
202. import android.view.KeyEvent;
     
203. 
     
204. public class OpenActivity extends Activity {
     
205. GLRender render = new GLRender();
     
206. 
     
207.     /** Called when the activity is first created. */
     
208.     @Override
     
209.     public void onCreate(Bundle savedInstanceState) {
     
210.         super.onCreate(savedInstanceState);
     
211.         GLImage.load(this.getResources());
     
212.         GLSurfaceView glView = new GLSurfaceView(this);
     
213.         glView.setRenderer(render);
     
214.         setContentView(glView);
     
215.     }
     
216.    
     
217.     public boolean onKeyUp(int keyCode, KeyEvent event){
     
218.     render.onKeyUp(keyCode, event);
     
219.     return false;
     
220.     }
     
221. }
     
222. 
     
223. GLImage.java:
     
224. 
     
225. package com.aurora.android.model;
     
226. 
     
227. import com.aurora.android.advanced.R;
     
228. 
     
229. import android.content.res.Resources;
     
230. import android.graphics.Bitmap;
     
231. import android.graphics.BitmapFactory;
     
232. 
     
233. public class GLImage {
     
234. 
     
235. public static Bitmap mBitmap;
     
236. 
     
237. public static void load(Resources resource){
     
238.                 //获取图片资源
     
239. mBitmap = BitmapFactory.decodeResource(resource, R.drawable.star);
     
240. }
     
241. }
     
242. 
     
243. Star.java:星星
     
244. 
     
245. package com.aurora.android.model;
     
246. 
     
247. public class Star {
     
248. 
     
249. public int r,g,b; //星星RGB颜色
     
250. public float dist;//星星距离中心的距离
     
251. public float angle = 0.0f; //当前星星处的角度
     
252. 
     
253. }

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星期六的深夜68

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