Android Open Source - OpenGL-es3-android Textured Triangle Fan

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License

The source code is released under:

GNU General Public License

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Java Source Code

package com.opengles3.demo.objects;
//w w  w .  ja va  2s. co  m
import com.opengles3.demo.geometry.VertexArray;
import com.opengles3.demo.programs.TextureShaderProgram;

import android.graphics.Color;
import android.opengl.GLES30;
import android.util.Log;

public abstract class TexturedTriangleFan {
  protected int POSITION_COMPONENT_COUNT;
  protected int TEXTURE_COORDINATES_COMPONENT_COUNT = 2;
  protected static final int BYTES_PER_FLOAT=4;
  protected int STRIDE;
  private float[] vertices;
  
  protected int pointsCount;
  
  private final VertexArray vertexArray;
  
  protected TexturedTriangleFan(float[] vertices,int positionComponentCount){
    vertexArray = new VertexArray(vertices);
    this.vertices = vertices;
    POSITION_COMPONENT_COUNT=positionComponentCount;
    pointsCount = (vertices.length/(TEXTURE_COORDINATES_COMPONENT_COUNT+POSITION_COMPONENT_COUNT));
    STRIDE = (POSITION_COMPONENT_COUNT + TEXTURE_COORDINATES_COMPONENT_COUNT)*BYTES_PER_FLOAT;
    
  }
  public void bindData(TextureShaderProgram textureProgram){
    vertexArray.setVertexAttribPointer(
        0,
        textureProgram.getPositionAttributeLocation(),
        POSITION_COMPONENT_COUNT,
        STRIDE);
    vertexArray.setVertexAttribPointer(
        POSITION_COMPONENT_COUNT,
        textureProgram.getTextureCoordinateAttributeLocation(),
        TEXTURE_COORDINATES_COMPONENT_COUNT,
        STRIDE);
  }
  public void draw(){
    GLES30.glDrawArrays(GLES30.GL_TRIANGLE_FAN, 0, pointsCount);
  }
  
  
  protected int getVerticesLength(){
    return this.vertices.length;
  }
}

Java Source Code List