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Revision 6ce08079

Added by Leszek Koltunski about 7 years ago

This commit (and reading the OpenGL ES 3.0 spec) pretty conclusively proves that, sadly, Nexus 4's Transform Feedback implementation is incomplete (doesn't work with GL_TRIANGLES primitiveMode)

View differences:

src/main/java/org/distorted/examples/feedback/FeedbackRenderer.java
42 42 
    private final int BYTESFLOAT = 4;
43 43 
    private final int POSITION   = 3;
44 44 

  		




  45
  
  
    
    private final boolean USEPOINTS=false;


  		




  
  45
  
    
    private final boolean USEPOINTS=true;


  		




  46
  46
  
    

  		




  47
  47
  
    
    private GLSurfaceView mView;


  		




  48
  48
  
    
    private DistortedProgram mFeedbackProgram;


  		




  ......




  62
  62
  
    
      {


  		




  63
  63
  
    
      mFeedbackProgram.useProgram();


  		




  64
  64
  
    

  		




  65
  
  
    
      int numVertices = (USEPOINTS ? mVertices : 3*(mVertices-2));


  		




  66
  
  
    

  		




  67
  65
  
    
      GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, mVBO[0]);


  		




  68
  
  
    
      GLES30.glVertexAttribPointer(mFeedbackProgram.mAttribute[0], USEPOINTS ? 1:POSITION, GLES30.GL_FLOAT, false, 0, 0);


  		




  
  66
  
    
      GLES30.glVertexAttribPointer(mFeedbackProgram.mAttribute[0], POSITION, GLES30.GL_FLOAT, false, 0, 0);


  		




  69
  67
  
    
      GLES30.glBindBufferBase(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0, mTBO[0]);


  		




  70
  68
  
    

  		




  71
  69
  
    
      GLES30.glEnable(GLES30.GL_RASTERIZER_DISCARD);


  		




  72
  70
  
    
      GLES30.glBeginTransformFeedback( USEPOINTS ? GLES30.GL_POINTS : GLES30.GL_TRIANGLES);


  		




  73
  
  
    
      GLES30.glDrawArrays( USEPOINTS ? GLES30.GL_POINTS : GLES30.GL_TRIANGLE_STRIP, 0, USEPOINTS ? mVertices*POSITION : mVertices);


  		




  
  71
  
    
      GLES30.glDrawArrays( USEPOINTS ? GLES30.GL_POINTS : GLES30.GL_TRIANGLE_STRIP, 0, mVertices);


  		




  
  72
  
    

  		




  
  73
  
    
      int error = GLES30.glGetError();


  		




  
  74
  
    

  		




  
  75
  
    
      if( error != GLES30.GL_NO_ERROR )


  		




  
  76
  
    
        {


  		




  
  77
  
    
        throw new RuntimeException("DrawArrays: glError 0x" + Integer.toHexString(error));


  		




  
  78
  
    
        }


  		




  
  79
  
    

  		




  74
  80
  
    
      GLES30.glEndTransformFeedback();


  		




  75
  81
  
    
      GLES30.glDisable(GLES30.GL_RASTERIZER_DISCARD);


  		




  76
  82
  
    
      GLES30.glFlush();


  		




  77
  83
  
    

  		




  
  84
  
    
      int numVertices = 3*(mVertices);


  		




  
  85
  
    

  		




  78
  86
  
    
      Buffer mappedBuffer =  GLES30.glMapBufferRange(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0, numVertices*POSITION*BYTESFLOAT, GLES30.GL_MAP_READ_BIT);


  		




  79
  87
  
    
      FloatBuffer fb = ((ByteBuffer) mappedBuffer).order(ByteOrder.nativeOrder()).asFloatBuffer();


  		




  80
  88
  
    
      String msg = "";


  		




  ......




  115
  123
  
    
      String header= "#version 300 es\n";


  		




  116
  124
  
    
      String[] feedback = { "outValue" };


  		




  117
  125
  
    

  		




  118
  
  
    
      if(USEPOINTS)


  		




  119
  
  
    
        {


  		




  120
  
  
    
        header += "#define USEPOINTS 1\n";


  		




  121
  
  
    
        }


  		




  122
  
  
    
      else


  		




  123
  
  
    
        {


  		




  124
  
  
    
        header += "#define USEPOINTS 0\n";


  		




  125
  
  
    
        }


  		




  126
  
  
    

  		




  127
  126
  
    
      try


  		




  128
  127
  
    
        {


  		




  129
  128
  
    
        mFeedbackProgram = new DistortedProgram(vertStream,fragStream, header, header, glsl, feedback );


  		




  ......




  141
  140
  
    
      mVBO = new int[1];


  		




  142
  141
  
    
      GLES30.glGenBuffers(1, mVBO, 0);


  		




  143
  142
  
    
      GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, mVBO[0]);


  		




  144
  
  
    
      GLES30.glBufferData(GLES30.GL_ARRAY_BUFFER, mVertices*POSITION*BYTESFLOAT, data, GLES30.GL_STATIC_READ);


  		




  
  143
  
    
      GLES30.glBufferData(GLES30.GL_ARRAY_BUFFER, mVertices*POSITION*BYTESFLOAT, data, GLES30.GL_STATIC_DRAW);


  		




  145
  144
  
    
      GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, 0);


  		




  146
  145
  
    

  		




  147
  
  
    
      int numVertices = (USEPOINTS ? mVertices : 3*(mVertices-2));


  		




  148
  
  
    

  		




  149
  146
  
    
      mTBO = new int[1];


  		




  150
  147
  
    
      GLES30.glGenBuffers(1, mTBO, 0);


  		




  151
  148
  
    
      GLES30.glBindBuffer(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, mTBO[0]);


  		




  152
  
  
    
      GLES30.glBufferData(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, numVertices*POSITION*BYTESFLOAT, null, GLES30.GL_STATIC_READ);


  		




  
  149
  
    
      GLES30.glBufferData(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 3*(mVertices)*POSITION*BYTESFLOAT, null, GLES30.GL_STATIC_READ);


  		




  153
  150
  
    
      GLES30.glBindBuffer(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0);


  		




  154
  151
  
    
      }


  		




  155
  152
  
    
}


  		












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