[Android开发学习11]Android OpenGL ES 颜色

一、基础知识:

1.平滑着色(Smooth coloring):

将多个顶点的不同颜色混合在一起，创建出漂亮的色彩混合。

2.单调着色:
给图形涂上一种固定单一的颜色。

3.三角形定义的颜色数组(平滑着色):

[java]
int one = 0x10000;
//三角形的顶点颜色值(r,g,b,a)
private IntBuffer colorBuffer = IntBuffer.wrap(new int[]{
    one,0,0,one,
    0,one,0,one,
    0,0,one,one,
});

int one = 0x10000;
//三角形的顶点颜色值(r,g,b,a)
private IntBuffer colorBuffer = IntBuffer.wrap(new int[]{
  one,0,0,one,
  0,one,0,one,
  0,0,one,one,
});

[java]
// 开启颜色渲染功能.
gl.glEnableClientState(GL10.GL_COLOR_ARRAY);

// 设置三角形顶点的颜色
gl.glColorPointer(4, GL10.GL_FIXED, 0, colorBuffer);

//关闭颜色渲染功能.
gl.glDisableClientState(GL10.GL_COLOR_ARRAY);

// 开启颜色渲染功能.
gl.glEnableClientState(GL10.GL_COLOR_ARRAY);

// 设置三角形顶点的颜色
gl.glColorPointer(4, GL10.GL_FIXED, 0, colorBuffer);

//关闭颜色渲染功能.
gl.glDisableClientState(GL10.GL_COLOR_ARRAY);

4.正方形定义的颜色数组(单调着色):

[java]
/* 渲染正方形 */
// 设置当前色为蓝色
gl.glColor4f(1.0f, 0.5f, 1.0f, 1.0f);

/* 渲染正方形 */
// 设置当前色为蓝色
gl.glColor4f(1.0f, 0.5f, 1.0f, 1.0f);

二、代码编辑:

【Activity01.java】

[java]
package com.yarin.android.Examples_12_02;

import android.app.Activity;
import android.opengl.GLSu易做图ceView;
import android.opengl.GLSu易做图ceView.Renderer;
import android.os.Bundle;

public class Activity01 extends Activity
{
    Renderer render = new GLRender();
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        GLSu易做图ceView glView = new GLSu易做图ceView(this);

        glView.setRenderer(render);
        setContentView(glView);
    }
}

package com.yarin.android.Examples_12_02;

import android.app.Activity;
import android.opengl.GLSu易做图ceView;
import android.opengl.GLSu易做图ceView.Renderer;
import android.os.Bundle;

public class Activity01 extends Activity
{
Renderer render = new GLRender();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);

  GLSu易做图ceView glView = new GLSu易做图ceView(this);

  glView.setRenderer(render);
  setContentView(glView);
}
}

【GLRender.java】

[java]
package com.yarin.android.Examples_12_02;

import java.nio.IntBuffer;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

import android.opengl.GLSu易做图ceView.Renderer;

public class GLRender implements Renderer
{
     int one = 0x10000;

     //三角形三个顶点
     private IntBuffer triggerBuffer = IntBuffer.wrap(new int[]{
            0,one,0,        //上顶点
            -one,-one,0,    //坐下点
            one,-one,0,}); //右下点
     //正方形的4个顶点
     private IntBuffer quaterBuffer = IntBuffer.wrap(new int[]{
                one,one,0,
                -one,one,0,
                one,-one,0,
                -one,-one,0});

     //三角形的顶点颜色值(r,g,b,a)
     private IntBuffer colorBuffer = IntBuffer.wrap(new int[]{
             one,0,0,one,
             0,one,0,one,
             0,0,one,one,
     });
    @Override
    public void onDrawFrame(GL10 gl)
    {
        // 清除屏幕和深度缓存
        gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
        // 重置当前的模型观察矩阵
        gl.glLoadIdentity();

        // 左移 1.5 单位，并移入屏幕 6.0
        gl.glTranslatef(-1.5f, 0.0f, -6.0f);

        //设置定点数组
        gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
        //设置颜色数组 -- 开启颜色渲染功能.
        gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
        // 设置三角形顶点的颜色
        gl.glColorPointer(4, GL10.GL_FIXED, 0, colorBuffer);
        // 设置三角形顶点
        gl.glVertexPointer(3, GL10.GL_FIXED, 0, triggerBuffer);
        //绘制三角形
        gl.glDrawArrays(GL10.GL_TRIANGLES, 0, 3);
        //关闭颜色数组 -- 关闭颜色渲染功能.
        gl.glDisableClientState(GL10.GL_COLOR_ARRAY);

补充：移动开发 , Android ,