Android Open Source - OpenGLShadowDemo Cube

• Back to OpenGL/Demo  ↑

From Project

Back to project page OpenGLShadowDemo.

License

The source code is released under:

MIT License

Java Source Code

package com.projectI.openglshadowdemo;
//from  w  ww.j av a  2 s.co  m
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;

import com.projectI.openglshadowdemo.common.RenderConstants;

import android.opengl.GLES20;

/**
 * Simple cube in openGL
 *
 */
public class Cube {
  private final FloatBuffer cubePosition;
  private final FloatBuffer cubeNormal;
  private final FloatBuffer cubeColor;
  
  // 6 sides * 2 triangles * 3 vertices * 3 coordinates
  float[] cubePositionData = {
        -1.0f,-1.0f,-1.0f, // triangle 1 : begin
        -1.0f,-1.0f, 1.0f,
        -1.0f, 1.0f, 1.0f, // triangle 1 : end
        1.0f, 1.0f,-1.0f, // triangle 2 : begin
        -1.0f,-1.0f,-1.0f,
        -1.0f, 1.0f,-1.0f, // triangle 2 : end
        1.0f,-1.0f, 1.0f,
        -1.0f,-1.0f,-1.0f,
        1.0f,-1.0f,-1.0f,
        1.0f, 1.0f,-1.0f,
        1.0f,-1.0f,-1.0f,
        -1.0f,-1.0f,-1.0f,
        -1.0f,-1.0f,-1.0f,
        -1.0f, 1.0f, 1.0f,
        -1.0f, 1.0f,-1.0f,
        1.0f,-1.0f, 1.0f,
        -1.0f,-1.0f, 1.0f,
        -1.0f,-1.0f,-1.0f,
        -1.0f, 1.0f, 1.0f,
        -1.0f,-1.0f, 1.0f,
        1.0f,-1.0f, 1.0f,
        1.0f, 1.0f, 1.0f,
        1.0f,-1.0f,-1.0f,
        1.0f, 1.0f,-1.0f,
        1.0f,-1.0f,-1.0f,
        1.0f, 1.0f, 1.0f,
        1.0f,-1.0f, 1.0f,
        1.0f, 1.0f, 1.0f,
        1.0f, 1.0f,-1.0f,
        -1.0f, 1.0f,-1.0f,
        1.0f, 1.0f, 1.0f,
        -1.0f, 1.0f,-1.0f,
        -1.0f, 1.0f, 1.0f,
        1.0f, 1.0f, 1.0f,
        -1.0f, 1.0f, 1.0f,
        1.0f,-1.0f, 1.0f
    };
  
  
  float[] cubeNormalData = {
      // nX, nY, nZ
        -1.0f, 0.0f, 0.0f, // triangle 1 : begin
        -1.0f, 0.0f, 0.0f,
        -1.0f, 0.0f, 0.0f, // triangle 1 : end
        0.0f, 0.0f, -1.0f, // triangle 2 : begin
        0.0f, 0.0f, -1.0f,
        0.0f, 0.0f, -1.0f, // triangle 2 : end
        0.0f,-1.0f, 0.0f, //
        0.0f,-1.0f, 0.0f,
        0.0f,-1.0f, 0.0f,
        0.0f, 0.0f,-1.0f, //
        0.0f, 0.0f,-1.0f,
        0.0f, 0.0f,-1.0f,
        -1.0f, 0.0f, 0.0f, //
        -1.0f, 0.0f, 0.0f,
        -1.0f, 0.0f, 0.0f,
        0.0f,-1.0f, 0.0f, //
        0.0f,-1.0f, 0.0f,
        0.0f,-1.0f, 0.0f,
        0.0f, 0.0f, 1.0f, //
        0.0f, 0.0f, 1.0f,
        0.0f, 0.0f, 1.0f,
        1.0f, 0.0f, 0.0f, //
        1.0f, 0.0f, 0.0f,
        1.0f, 0.0f, 0.0f,
        1.0f, 0.0f, 0.0f, //
        1.0f, 0.0f, 0.0f,
        1.0f, 0.0f, 0.0f,
        0.0f, 1.0f, 0.0f, //
        0.0f, 1.0f, 0.0f,
        0.0f, 1.0f, 0.0f,
        0.0f, 1.0f, 0.0f, //
        0.0f, 1.0f, 0.0f,
        0.0f, 1.0f, 0.0f,
        0.0f, 0.0f, 1.0f, //
        0.0f, 0.0f, 1.0f,
        0.0f, 0.0f, 1.0f
      };
      
  //size of color data array: 6 sides * 2 triangles * 3 points * 4 color (RGBA) values
  float[] cubeColorData = new float[12*3*4];
  
  /**
   * Create a new cube with specified center position, size and color
   * @param center
   * @param size
   * @param color
   */
  public Cube(float[] center, float size, float[] color) {
    //set color data
    for (int v = 0; v < 12*3 ; v++){
      cubeColorData[4*v+0] = color[0];
      cubeColorData[4*v+1] = color[1];
      cubeColorData[4*v+2] = color[2];
      cubeColorData[4*v+3] = color[3];
    }
    
    //resize the cube
    for (int i = 0; i < 108; i++) {
      cubePositionData[i] = cubePositionData[i] * size/2;
    }
    
    //move the center of the cube to the place specified in parameter
    for (int j = 0; j < 36; j++) {
      cubePositionData[3*j] = cubePositionData[3*j] + center[0];
      cubePositionData[3*j + 1] = cubePositionData[3*j + 1] + center[1];
      cubePositionData[3*j + 2] = cubePositionData[3*j + 2] + center[2];
    }
    
    // Initialize the buffers.
    ByteBuffer bPos = ByteBuffer.allocateDirect(cubePositionData.length * RenderConstants.FLOAT_SIZE_IN_BYTES);
    bPos.order(ByteOrder.nativeOrder());
    cubePosition = bPos.asFloatBuffer();
    
    ByteBuffer bNormal = ByteBuffer.allocateDirect(cubeNormalData.length * RenderConstants.FLOAT_SIZE_IN_BYTES);
    bNormal.order(ByteOrder.nativeOrder());
    cubeNormal = bNormal.asFloatBuffer();
    
    ByteBuffer bColor = ByteBuffer.allocateDirect(cubeColorData.length * RenderConstants.FLOAT_SIZE_IN_BYTES);
    bColor.order(ByteOrder.nativeOrder());
    cubeColor = bColor.asFloatBuffer();
          
    cubePosition.put(cubePositionData).position(0);
    cubeNormal.put(cubeNormalData).position(0);
    cubeColor.put(cubeColorData).position(0);
  }

  public void render(int positionAttribute, int normalAttribute, int colorAttribute, boolean onlyPosition) {
    
    // Pass in the position information
    cubePosition.position(0);    
        GLES20.glVertexAttribPointer(positionAttribute, 3, GLES20.GL_FLOAT, false,
            0, cubePosition);        
                
        GLES20.glEnableVertexAttribArray(positionAttribute);                       
        
        
        if (!onlyPosition)
        {
          // Pass in the normal information
          cubeNormal.position(0);
          GLES20.glVertexAttribPointer(normalAttribute, 3, GLES20.GL_FLOAT, false, 
               0, cubeNormal);
          
          GLES20.glEnableVertexAttribArray(normalAttribute);  
          
          // Pass in the color information
          cubeColor.position(0);
          GLES20.glVertexAttribPointer(colorAttribute, 4, GLES20.GL_FLOAT, false, 
              0, cubeColor);
          
          GLES20.glEnableVertexAttribArray(colorAttribute);  
        }
        
        // Draw the cube.
        GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 36); 
  }
}

Java Source Code List

• Back to OpenGL/Demo  ↑