Android的OpenGL学习笔记（4）

这次主要是给前几次笔记做出的三角形上色呵呵……

其实很简单，只需添加几句话就行了，主要变化在VortexRenderer.java代码中，现把代码贴出来：

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. privatefloat_red=0f;
  17. privatefloat_green=0f;
  18. privatefloat_blue=0f;
  20. //arawbuffertoholdindicesallowingareuseofpoints.
  21. privateShortBuffer_indexBuffer;
  23. //arawbuffertoholdthevertices
  24. privateFloatBuffer_vertexBuffer;
  26. //arawbuffertoholdthecolors
  27. privateFloatBuffer_colorBuffer;
  29. privateshort[]_indicesArray={0,1,2};
  30. privateint_nrOfVertices=3;
  32. privatefloat_angle;
  34. @Override
  35. publicvoidonSurfaceCreated(GL10gl,EGLConfigconfig){
  36. //preparation
  37. gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);//允许设置顶点
  38. gl.glEnableClientState(GL10.GL_COLOR_ARRAY);//允许设置颜色
  39. initTriangle();
  40. }
  42. @Override
  43. publicvoidonSurfaceChanged(GL10gl,intw,inth){
  44. gl.glViewport(0,0,w,h);
  45. }
  47. publicvoidsetAngle(floatangle){
  48. _angle=angle;
  49. }
  51. @Override
  52. publicvoidonDrawFrame(GL10gl){
  53. //definethecolorwewanttobedisplayedasthe"clippingwall"
  54. gl.glClearColor(_red,_green,_blue,1.0f);
  56. //resetthematrix-goodtofixtherotationtoastaticangle
  57. gl.glLoadIdentity();
  59. //clearthecolorbuffertoshowtheClearColorwecalledabove...
  60. gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
  62. //setrotationforthenon-statictriangle
  63. gl.glRotatef(_angle,0f,1f,0f);
  65. //gl.glColor4f(0.5f,0f,0f,0.5f);
  66. gl.glVertexPointer(3,GL10.GL_FLOAT,0,_vertexBuffer);//设置顶点数组
  67. gl.glColorPointer(4,GL10.GL_FLOAT,0,_colorBuffer);//设置颜色数组
  68. gl.glDrawElements(GL10.GL_TRIANGLES,_nrOfVertices,GL10.GL_UNSIGNED_SHORT,_indexBuffer);
  69. }
  71. privatevoidinitTriangle(){
  72. //floathas4bytes
  73. ByteBuffervbb=ByteBuffer.allocateDirect(_nrOfVertices*3*4);
  74. vbb.order(ByteOrder.nativeOrder());
  75. _vertexBuffer=vbb.asFloatBuffer();
  77. //shorthas4bytes
  78. ByteBufferibb=ByteBuffer.allocateDirect(_nrOfVertices*2);
  79. ibb.order(ByteOrder.nativeOrder());
  80. _indexBuffer=ibb.asShortBuffer();
  82. //floathas4bytes,4colors(RGBA)*numberofvertices*4bytes
  83. ByteBuffercbb=ByteBuffer.allocateDirect(4*_nrOfVertices*4);
  84. cbb.order(ByteOrder.nativeOrder());
  85. _colorBuffer=cbb.asFloatBuffer();
  87. float[]coords={
  88. -0.5f,-0.5f,0f,//(x1,y1,z1)
  89. 0.5f,-0.5f,0f,//(x2,y2,z2)
  90. 0.5f,0.5f,0f//(x3,y3,z3)
  91. };
  93. float[]colors={
  94. 1f,0f,0f,1f,//point1
  95. 0f,1f,0f,1f,//point2
  96. 0f,0f,1f,1f,//point3
  97. };
  99. _vertexBuffer.put(coords);
  100. _indexBuffer.put(_indicesArray);
  101. _colorBuffer.put(colors);
  103. _vertexBuffer.position(0);
  104. _indexBuffer.position(0);
  105. _colorBuffer.position(0);
  106. }
  108. publicvoidsetColor(floatr,floatg,floatb){
  109. _red=r;
  110. _green=g;
  111. _blue=b;
  112. }
  113. }

最终效果图：

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