Android Open Source - FireflyAndroidLWP Mesh Helper

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From Project

Back to project page FireflyAndroidLWP.

License

The source code is released under:

GNU General Public License

Java Source Code

package net.precariouspanther.gdxtest;
//from www. j  a v  a  2  s . co m
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Mesh;
import com.badlogic.gdx.graphics.VertexAttribute;
import com.badlogic.gdx.graphics.VertexAttributes.Usage;
import com.badlogic.gdx.graphics.glutils.ShaderProgram;

public class MeshHelper {
  private Mesh mesh;
  private ShaderProgram meshShader;
  
  public MeshHelper() {
        createShader();
    }

  public void createMesh(float[] vertices) {
    mesh = new Mesh(true, vertices.length, 0, 
        new VertexAttribute(Usage.Position, 2, "a_position"),
        new VertexAttribute(Usage.ColorPacked,4,"a_color")
    );
    mesh.setVertices(vertices);

  }
  


    private void createShader() {
        // this shader tells opengl where to put things
        String vertexShader = "attribute vec4 a_position;    \n"
                            + "attribute vec4 a_color;       \n"
                            + "varying vec4 v_color;         \n"
                            + "void main()                   \n"
                            + "{                             \n"
                            + "   v_color = a_color;      \n"
                            + "   gl_Position = a_position;  \n"
                            + "}                             \n";
 
        // this one tells it what goes in between the points (i.e
        // colour/texture)
        String fragmentShader = "#ifdef GL_ES                \n"
                              + "precision mediump float;    \n"
                              + "#endif                      \n"
                              + "varying vec4 v_color;       \n"
                              + "void main()                 \n"
                              + "{                           \n"
                              + "  gl_FragColor = v_color;   \n"
                              + "}";
 
        // make an actual shader from our strings
        meshShader = new ShaderProgram(vertexShader, fragmentShader);
 
        // check there's no shader compile errors
        if (!meshShader.isCompiled())
            throw new IllegalStateException(meshShader.getLog());
    }
    

    public void drawMesh() {
        // this should be called in render()
        if (mesh == null)
            throw new IllegalStateException("drawMesh called before a mesh has been created.");
 
        meshShader.begin();
        mesh.render(meshShader, GL20.GL_TRIANGLES);
        meshShader.end();
    }
    public void dispose() {
        mesh.dispose();
        meshShader.dispose();
    }
    
}

Java Source Code List

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