Android Open Source - opengl Open G L Renderer

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License

The source code is released under:

Apache License

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Java Source Code

package edu.cs4730.OpenGlDemo;
/*from w  ww .j a va  2  s . c  o  m*/
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;


import android.opengl.GLU;
import android.opengl.GLSurfaceView.Renderer;

public class OpenGLRenderer implements Renderer {

  // Initialize our square.
  Square square = new Square();

  /*
   * (non-Javadoc)
   *
   * @see
   * android.opengl.GLSurfaceView.Renderer#onSurfaceCreated(javax.
         * microedition.khronos.opengles.GL10, javax.microedition.khronos.
         * egl.EGLConfig)
   */
  public void onSurfaceCreated(GL10 gl, EGLConfig config) {
    // Set the background color to black ( rgba ).
    gl.glClearColor(0.0f, 0.0f, 0.0f, 0.5f);  // OpenGL docs.
    // Enable Smooth Shading, default not really needed.
    gl.glShadeModel(GL10.GL_SMOOTH);// OpenGL docs.
    // Depth buffer setup.
    gl.glClearDepthf(1.0f);// OpenGL docs.
    // Enables depth testing.
    gl.glEnable(GL10.GL_DEPTH_TEST);// OpenGL docs.
    // The type of depth testing to do.
    gl.glDepthFunc(GL10.GL_LEQUAL);// OpenGL docs.
    // Really nice perspective calculations.
    gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, // OpenGL docs.
                          GL10.GL_NICEST);
  }

  /*
   * (non-Javadoc)
   *
   * @see
   * android.opengl.GLSurfaceView.Renderer#onDrawFrame(javax.
         * microedition.khronos.opengles.GL10)
   */
  public void onDrawFrame(GL10 gl) {
    // Clears the screen and depth buffer.
    gl.glClear(GL10.GL_COLOR_BUFFER_BIT | // OpenGL docs.
                           GL10.GL_DEPTH_BUFFER_BIT);
    // Replace the current matrix with the identity matrix
    gl.glLoadIdentity(); // OpenGL docs

    // Translates 4 units into the screen.
    gl.glTranslatef(0, 0, -4); // OpenGL docs

    // Draw our square.
    square.draw(gl); // ( NEW )
    

  }

  /*
   * (non-Javadoc)
   *
   * @see
   * android.opengl.GLSurfaceView.Renderer#onSurfaceChanged(javax.
         * microedition.khronos.opengles.GL10, int, int)
   */
  public void onSurfaceChanged(GL10 gl, int width, int height) {
    // Sets the current view port to the new size.
    gl.glViewport(0, 0, width, height);// OpenGL docs.
    // Select the projection matrix
    gl.glMatrixMode(GL10.GL_PROJECTION);// OpenGL docs.
    // Reset the projection matrix
    gl.glLoadIdentity();// OpenGL docs.
    // Calculate the aspect ratio of the window
    GLU.gluPerspective(gl, 45.0f, (float) width / (float) height,
        0.1f, 100.0f);
    // Select the modelview matrix
    gl.glMatrixMode(GL10.GL_MODELVIEW);// OpenGL docs.
    // Reset the modelview matrix
    gl.glLoadIdentity();// OpenGL docs.
  }
}

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