How do I set up a floating point plugin using libGDX?

Since OpenGL 2.0 does not support the following extensions:

glClampColorARB(GL_CLAMP_VERTEX_COLOR_ARB, GL_FALSE);
glClampColorARB(GL_CLAMP_READ_COLOR_ARB, GL_FALSE);
glClampColorARB(GL_CLAMP_FRAGMENT_COLOR_ARB, GL_FALSE);

      

        
        
        
      

    

I need to set up the floating point render targets so that my final texture is not clamped between 0 and 1. as needed, so that the texture output is unclosed because I am using libGDX for image processing.

try for a few days to get this to work:

    frameBuffer1 = new FrameBuffer(usedFormat, w, h, true); 
    frameBuffer2 = new FrameBuffer(usedFormat, w, h, true); 

    frameBuffer1.begin();
    gl20.glViewport(0, 0, frameBuffer1.getWidth(), frameBuffer1.getHeight());
    gl20.glClearColor(0f, 0f, 0f, 0f);
    gl20.glClear(GL20.GL_COLOR_BUFFER_BIT | GL20.GL_DEPTH_BUFFER_BIT);
    gl20.glActiveTexture(GL20.GL_TEXTURE0);
    testTexture.bind(); //input image texture
    gl20.glEnable(GL20.GL_TEXTURE_2D);
    meshShader1.begin();
    meshShader1.setUniformi("s_texture", 0);
    mesh.render(meshShader1, GL20.GL_TRIANGLES);
    meshShader1.end();
    frameBuffer1.end(); 

    frameBuffer2.begin();
    gl20.glViewport(0, 0, frameBuffer2.getWidth(), frameBuffer2.getHeight());
    gl20.glClearColor(0f, 0f, 0f, 0f);
    gl20.glClear(GL20.GL_COLOR_BUFFER_BIT | GL20.GL_DEPTH_BUFFER_BIT);
    frameBuffer1.getColorBufferTexture().bind()
    meshShader2.begin();
    meshShader2.setUniformi("s_texture", 0);
    mesh.render(meshShader2, GL20.GL_TRIANGLES);
    meshShader2.end();     
    frameBuffer2.end();

      

        
        
        
      

    

I have 2 simple shader programs to check if a texture keeps unclosed values. The first subtracts 0.5 from the input texture image, and the second adds 0.5 to the output of the first frame buffer.