Android的OpenGL学习笔记（5）

接着前面的知识学习，现在可以做一个3D的图形了，和以往一样，必要的解释都在注释中：

VortexRenderer.java代码：

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;
  13. publicclassVortexRendererimplementsGLSurfaceView.Renderer{
  14. privatestaticfinalStringLOG_TAG=VortexRenderer.class.getSimpleName();
  16. //arawbuffertoholdindicesallowingareuseofpoints.
  17. privateShortBuffer_indexBuffer;
  19. //arawbuffertoholdthevertices
  20. privateFloatBuffer_vertexBuffer;
  22. //arawbuffertoholdthecolors
  23. privateFloatBuffer_colorBuffer;
  25. privateint_nrOfVertices=0;
  27. privatefloat_xAngle;
  28. privatefloat_yAngle;
  30. @Override
  31. publicvoidonSurfaceCreated(GL10gl,EGLConfigconfig){
  32. //preparation
  33. //enablethedifferentiationofwhichsidemaybevisible
  34. gl.glEnable(GL10.GL_CULL_FACE);//enable了culling面，以保证只有一面。
  35. //whichisthefront?theonewhichisdrawncounterclockwise
  36. gl.glFrontFace(GL10.GL_CCW);//GL_CCW表示逆时针,定义了哪种顺序为前面。GL_CW表示逆时针
  37. //whichoneshouldNOTbedrawn
  38. gl.glCullFace(GL10.GL_BACK);//设置其为GL_BACK以保证只显示正面.这或许有点迷糊偶，
  39. //你可以看看如果用GL_FRONT_AND_BACK会发生什么……你将什么也看不到。
  41. gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);//允许设置顶点
  42. gl.glEnableClientState(GL10.GL_COLOR_ARRAY);//允许设置顶点颜色
  44. initTriangle();
  45. }
  47. @Override
  48. publicvoidonSurfaceChanged(GL10gl,intw,inth){
  49. gl.glViewport(0,0,w,h);
  50. }
  52. publicvoidsetXAngle(floatangle){
  53. _xAngle=angle;
  54. }
  56. publicfloatgetXAngle(){
  57. return_xAngle;
  58. }
  60. publicvoidsetYAngle(floatangle){
  61. _yAngle=angle;
  62. }
  64. publicfloatgetYAngle(){
  65. return_yAngle;
  66. }
  68. @Override
  69. publicvoidonDrawFrame(GL10gl){
  70. //definethecolorwewanttobedisplayedasthe"clippingwall"
  71. gl.glClearColor(0f,0f,0f,1.0f);
  73. //resetthematrix-goodtofixtherotationtoastaticangle
  74. gl.glLoadIdentity();
  76. //clearthecolorbufferandthedepthbuffertoshowtheClearColor
  77. //wecalledabove...
  78. gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
  80. //setrotation
  81. gl.glRotatef(_xAngle,1f,0f,0f);
  82. gl.glRotatef(_yAngle,0f,1f,0f);
  84. //gl.glColor4f(0.5f,0f,0f,0.5f);
  85. gl.glVertexPointer(3,GL10.GL_FLOAT,0,_vertexBuffer);
  86. gl.glColorPointer(4,GL10.GL_FLOAT,0,_colorBuffer);
  87. gl.glDrawElements(GL10.GL_TRIANGLES,_nrOfVertices,
  88. GL10.GL_UNSIGNED_SHORT,_indexBuffer);
  89. }
  91. privatevoidinitTriangle(){
  92. float[]coords={
  93. -0.5f,-0.5f,0.5f,//0
  94. 0.5f,-0.5f,0.5f,//1
  95. 0f,-0.5f,-0.5f,//2
  96. 0f,0.5f,0f,//3
  97. };
  98. _nrOfVertices=coords.length;
  100. float[]colors={
  101. 1f,0f,0f,1f,//point0red
  102. 0f,1f,0f,1f,//point1green
  103. 0f,0f,1f,1f,//point2blue
  104. 1f,1f,1f,1f,//point3white
  105. };
  107. short[]indices=newshort[]{
  108. 0,1,3,//rwg
  109. 0,2,1,//rbg
  110. 0,3,2,//rbw
  111. 1,2,3,//bwg
  112. };
  114. //floathas4bytes,coordinate*4bytes
  115. ByteBuffervbb=ByteBuffer.allocateDirect(coords.length*4);
  116. vbb.order(ByteOrder.nativeOrder());
  117. _vertexBuffer=vbb.asFloatBuffer();
  119. //shorthas2bytes,indices*2bytes
  120. ByteBufferibb=ByteBuffer.allocateDirect(indices.length*2);
  121. ibb.order(ByteOrder.nativeOrder());
  122. _indexBuffer=ibb.asShortBuffer();
  124. //floathas4bytes,colors(RGBA)*4bytes
  125. ByteBuffercbb=ByteBuffer.allocateDirect(colors.length*4);
  126. cbb.order(ByteOrder.nativeOrder());
  127. _colorBuffer=cbb.asFloatBuffer();
  129. _vertexBuffer.put(coords);
  130. _indexBuffer.put(indices);
  131. _colorBuffer.put(colors);
  133. _vertexBuffer.position(0);
  134. _indexBuffer.position(0);
  135. _colorBuffer.position(0);
  136. }
  137. }

VortexView.java代码：

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;
  12. privatefloat_z=0;
  14. publicVortexView(Contextcontext){
  15. super(context);
  16. _renderer=newVortexRenderer();
  17. setRenderer(_renderer);
  18. }
  20. publicbooleanonTouchEvent(finalMotionEventevent){
  21. if(event.getAction()==MotionEvent.ACTION_DOWN){
  22. _x=event.getX();
  23. _y=event.getY();
  24. }
  25. if(event.getAction()==MotionEvent.ACTION_MOVE){
  26. finalfloatxdiff=(_x-event.getX());
  27. finalfloatydiff=(_y-event.getY());
  28. queueEvent(newRunnable(){
  29. publicvoidrun(){
  30. _renderer.setXAngle(_renderer.getXAngle()+ydiff);
  31. _renderer.setYAngle(_renderer.getYAngle()+xdiff);
  32. }
  33. });
  34. _x=event.getX();
  35. _y=event.getY();
  36. }
  37. returntrue;
  38. }
  39. }

最终效果图：

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