Android的OpenGL学习笔记（6）

绘制多个3D模型，让你深刻体会3D空间，这里开启了深度测试功能：

Code:
  1. packagecom.droidnova.android.games.vortex;
  3. importjava.nio.ByteBuffer;
  4. importjava.nio.ByteOrder;
  5. importjava.nio.FloatBuffer;
  6. importjava.nio.ShortBuffer;
  8. importjavax.microedition.khronos.egl.EGLConfig;
  9. importjavax.microedition.khronos.opengles.GL10;
  11. importandroid.opengl.GLSurfaceView;
  12. importandroid.util.Log;
  14. publicclassVortexRendererimplementsGLSurfaceView.Renderer{
  15. privatestaticfinalStringLOG_TAG=VortexRenderer.class.getSimpleName();
  17. //arawbuffertoholdindicesallowingareuseofpoints.
  18. privateShortBuffer_indexBuffer;
  20. //arawbuffertoholdthevertices
  21. privateFloatBuffer_vertexBuffer;
  23. //arawbuffertoholdthecolors
  24. privateFloatBuffer_colorBuffer;
  26. privateint_nrOfVertices=0;
  28. privatefloat_xAngle;
  29. privatefloat_yAngle;
  31. privatefloat_width=320f;
  32. privatefloat_height=480f;
  34. @Override
  35. publicvoidonSurfaceCreated(GL10gl,EGLConfigconfig){
  36. //preparation
  37. Log.i(LOG_TAG,"onSurfaceCreated()");
  38. gl.glMatrixMode(GL10.GL_PROJECTION);//透视模型
  39. floatsize=.01f*(float)Math.tan(Math.toRadians(45.0)/2);//角度制转换为弧度制，然后除以2，这里不是取整。然后求正切值
  40. floatratio=_width/_height;
  41. //perspective:
  42. gl.glFrustumf(-size,size,-size/ratio,size/ratio,0.01f,100.0f);
  43. //orthographic:
  44. //gl.glOrthof(-1,1,-1/ratio,1/ratio,0.01f,100.0f);
  45. gl.glViewport(0,0,(int)_width,(int)_height);
  46. gl.glMatrixMode(GL10.GL_MODELVIEW);//视图模型
  47. gl.glEnable(GL10.GL_DEPTH_TEST);//允许深度测试
  49. //definethecolorwewanttobedisplayedasthe"clippingwall"
  50. gl.glClearColor(0f,0f,0f,1.0f);
  52. //enablethedifferentiationofwhichsidemaybevisible
  53. gl.glEnable(GL10.GL_CULL_FACE);
  54. //whichisthefront?theonewhichisdrawncounterclockwise
  55. gl.glFrontFace(GL10.GL_CCW);
  56. //whichoneshouldNOTbedrawn
  57. gl.glCullFace(GL10.GL_BACK);
  59. gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
  60. gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
  62. initTriangle();
  63. }
  65. @Override
  66. publicvoidonSurfaceChanged(GL10gl,intw,inth){
  67. Log.i(LOG_TAG,"onSurfaceChanged()");
  68. _width=w;
  69. _height=h;
  70. gl.glViewport(0,0,w,h);
  71. }
  73. publicvoidsetXAngle(floatangle){
  74. _xAngle=angle;
  75. }
  77. publicfloatgetXAngle(){
  78. return_xAngle;
  79. }
  81. publicvoidsetYAngle(floatangle){
  82. _yAngle=angle;
  83. }
  85. publicfloatgetYAngle(){
  86. return_yAngle;
  87. }
  89. @Override
  90. publicvoidonDrawFrame(GL10gl){
  91. //clearthecolorbufferandthedepthbuffer
  92. gl.glClear(GL10.GL_COLOR_BUFFER_BIT|GL10.GL_DEPTH_BUFFER_BIT);
  94. gl.glVertexPointer(3,GL10.GL_FLOAT,0,_vertexBuffer);
  95. gl.glColorPointer(4,GL10.GL_FLOAT,0,_colorBuffer);
  97. for(inti=1;i<=10;i++){
  98. gl.glLoadIdentity();
  99. gl.glTranslatef(0.0f,-1f,-1.0f+-1.5f*i);
  100. //setrotation
  101. gl.glRotatef(-_xAngle,1f,0f,0f);
  102. gl.glRotatef(-_yAngle,0f,1f,0f);
  103. gl.glDrawElements(GL10.GL_TRIANGLES,_nrOfVertices,GL10.GL_UNSIGNED_SHORT,_indexBuffer);
  104. }
  105. }
  107. privatevoidinitTriangle(){
  108. float[]coords={
  109. -0.5f,-0.5f,0.5f,//0
  110. 0.5f,-0.5f,0.5f,//1
  111. 0f,-0.5f,-0.5f,//2
  112. 0f,0.5f,0f,//3
  113. };
  114. _nrOfVertices=coords.length;
  116. float[]colors={
  117. 1f,0f,0f,1f,//point0red
  118. 0f,1f,0f,1f,//point1green
  119. 0f,0f,1f,1f,//point2blue
  120. 1f,1f,1f,1f,//point3white
  121. };
  123. short[]indices=newshort[]{
  124. 0,1,3,//rwg
  125. 0,2,1,//rbg
  126. 0,3,2,//rbw
  127. 1,2,3,//bwg
  128. };
  130. //floathas4bytes,coordinate*4bytes
  131. ByteBuffervbb=ByteBuffer.allocateDirect(coords.length*4);
  132. vbb.order(ByteOrder.nativeOrder());
  133. _vertexBuffer=vbb.asFloatBuffer();
  135. //shorthas2bytes,indices*2bytes
  136. ByteBufferibb=ByteBuffer.allocateDirect(indices.length*2);
  137. ibb.order(ByteOrder.nativeOrder());
  138. _indexBuffer=ibb.asShortBuffer();
  140. //floathas4bytes,colors(RGBA)*4bytes
  141. ByteBuffercbb=ByteBuffer.allocateDirect(colors.length*4);
  142. cbb.order(ByteOrder.nativeOrder());
  143. _colorBuffer=cbb.asFloatBuffer();
  145. _vertexBuffer.put(coords);
  146. _indexBuffer.put(indices);
  147. _colorBuffer.put(colors);
  149. _vertexBuffer.position(0);
  150. _indexBuffer.position(0);
  151. _colorBuffer.position(0);
  152. }
  153. }

VortexView.java

Code:
  1. packagecom.droidnova.android.games.vortex;
  3. importandroid.content.Context;
  4. importandroid.opengl.GLSurfaceView;
  5. importandroid.view.MotionEvent;
  7. publicclassVortexViewextendsGLSurfaceView{
  8. privatestaticfinalStringLOG_TAG=VortexView.class.getSimpleName();
  9. privateVortexRenderer_renderer;
  10. privatefloat_x=0;
  11. privatefloat_y=0;
  13. publicVortexView(Contextcontext){
  14. super(context);
  15. _renderer=newVortexRenderer();
  16. setRenderer(_renderer);
  17. }
  19. publicbooleanonTouchEvent(finalMotionEventevent){
  20. if(event.getAction()==MotionEvent.ACTION_DOWN){
  21. _x=event.getX();
  22. _y=event.getY();
  23. }
  24. if(event.getAction()==MotionEvent.ACTION_MOVE){
  25. finalfloatxdiff=(_x-event.getX());
  26. finalfloatydiff=(_y-event.getY());
  27. queueEvent(newRunnable(){
  28. publicvoidrun(){
  29. _renderer.setXAngle(_renderer.getXAngle()+ydiff);
  30. _renderer.setYAngle(_renderer.getYAngle()+xdiff);
  31. }
  32. });
  33. _x=event.getX();
  34. _y=event.getY();
  35. }
  36. returntrue;
  37. }
  38. }

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