OpenGlES这东西真TM蛋疼，研究了几天了，终于能把这东西画出来
，新手学开发就是不容易阿
其实两种方法都是画12个三角形画出来的，在OpenGL ES中，只支持三角形，所以任何复杂多边形都是由三角形画出来的。
第一种：顶点法
：
把一个四边形当成一个面，而一个面由两个三角形组成。一个三角形是不是有3个顶点？，所以一个面就有了3+3个顶点，一个立方体有6个面，6*6个顶点
此立方体的颜色也是根据顶点所渲染，正如定义这个立方体的顶点一样，不过它的参数可不是和定义顶点的一样哦，它的参数类型是：R，G，B，A，代表的是颜色值
public class OpenGlEsDemoActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
GLSurfaceView glview = new GLSurfaceView(this);
glview.setRenderer(new OpenGlRender());
setContentView(glview);
}
}
public class OpenGlRender implements GLSurfaceView.Renderer{
//每一个面画两个三角形，立方体有6个面
private float[] vertices={
-1.0f,1.0f,1f, // top left
-1.0f,-1.0f,1f, // bottom left
1.0f,-1.0f,1f, //top right
-1.0f,1.0f,1f, //bottom left
1.0f,-1.0f,1f, //bottom right
1.0f,1.0f,1f, //top right //前面
1.0f,1.0f,1f,
1.0f,-1.0f,1f,
1.0f,-1.0f,-1f,
1.0f,1.0f,1f,
1.0f,-1.0f,-1.0f,
1.0f,1.0f,-1f, //右面
-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, //左面
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, //后面
-1.0f,1.0f,-1.0f, // top left
-1.0f,1.0f,1.0f, //bottom left
1.0f,1.0f,-1.0f, //top right
-1.0f,1.0f,1.0f, //bottom left
1.0f,1.0f,1.0f, //top right
1.0f,1.0f,-1.0f, // -top right上面
-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, //下面
};
//立方体的顶点颜色
private float[] colors={
1f,0f,0f,1f,
1f,0f,0f,1f,
1f,0f,0f,1f,
1f,0f,0f,1f,
1f,0f,0f,1f,
1f,0f,0f,1f,
1f,0f,1f,1f,
1f,0f,1f,1f,
1f,0f,1f,1f,
1f,0f,1f,1f,
1f,0f,1f,1f,
1f,0f,1f,1f,
0f,1f,0f,1f,
0f,1f,0f,1f,
0f,1f,0f,1f,
0f,1f,0f,1f,
0f,1f,0f,1f,
0f,1f,0f,1f,
0f,0f,1f,1f,
0f,0f,1f,1f,
0f,0f,1f,1f,
0f,0f,1f,1f,
0f,0f,1f,1f,
0f,0f,1f,1f,
0.5f,0f,1f,1f,
0.5f,0f,1f,1f,
0.5f,0f,1f,1f,
0.5f,0f,1f,1f,
0.5f,0f,1f,1f,
0.5f,0f,1f,1f,
1f,0f,0.5f,1f,
1f,0f,0.5f,1f,
1f,0f,0.5f,1f,
1f,0f,0.5f,1f,
1f,0f,0.5f,1f,
1f,0f,0.5f,1f,
};
FloatBuffer vertBuffer; //顶点缓冲
FloatBuffer colorBuffer; //颜色缓冲
float rx=-70f; //旋转角度
public OpenGlRender(){
ByteBuffer vbb=ByteBuffer.allocateDirect(vertices.length*4);
vbb.order(ByteOrder.nativeOrder());
vertBuffer=vbb.asFloatBuffer();
vertBuffer.put(vertices);
vertBuffer.position(0);
ByteBuffer cbb= ByteBuffer.allocateDirect(colors.length*4);
cbb.order(ByteOrder.nativeOrder());
colorBuffer = cbb.asFloatBuffer();
colorBuffer.put(colors);
colorBuffer.position(0);
}
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
//启用深度测试
gl.glEnable(GL10.GL_DEPTH_TEST);
// 所做深度测试的类型
gl.glDepthFunc(GL10.GL_DITHER);
//黑色背景
gl.glClearColor(0f, 0f, 0f, 0.5f);
//启用阴影平滑
gl.glShadeModel(GL10.GL_SMOOTH);
//清除深度缓存
gl.glClearDepthf(1.0f);
gl.glEnable(GL10.GL_TEXTURE_2D);
//告诉系统对透视进行修正
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
}
public void draw(GL10 gl){
gl.glFrontFace(GL10.GL_CCW);
gl.glEnable(GL10.GL_CULL_FACE);
gl.glCullFace(GL10.GL_BACK);
//开启顶点和纹理缓冲
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertBuffer);
gl.glColorPointer(4, GL10.GL_FLOAT, 0, colorBuffer);
gl.glLoadIdentity();
gl.glTranslatef(0, 0, -5);
gl.glRotatef(45f, 0f, 1f, 0f); //往右边(y轴)倾斜45度C
gl.glRotatef(rx,1f, 0f, 0f); //往上面倾斜(x轴)倾斜,根据每次得到的角度
gl.glDrawArrays(GL10.GL_TRIANGLES, 0,vertices.length);
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glDisableClientState(GL10.GL_COLOR_ARRAY);
gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
gl.glDisable(GL10.GL_CULL_FACE);
rx--; //旋转角度减1
}
public void onDrawFrame(GL10 gl) {
// 清除深度和颜色缓存
gl.glClearColor(0f, 0f, 0f, 0.5f);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glMatrixMode(GL10.GL_MODELVIEW); //设置矩阵模式
draw(gl);
}
public void onSurfaceChanged(GL10 gl, int width, int height) {
gl.glViewport(0, 0, width, height);
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
GLU.gluPerspective(gl, 45.0f, (float)width/(float)height, 0.1f, 100.f);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
}
第二种：索引法
画出来的效果与 上面是一样的，不过它是通过索引所画出来的
还是分成6个面来画，一个面画2个三角形。
-1f,1f,1f, //0
-1f,-1f,1f, //1
1f,-1f,1f, //2
1f,1f,1f, //3
这里画出来的是这个立方体的最前面，对应的还是x,y,z轴。
private short[] indices={
0,1,2,
0,2,3,}只不过的是在这个indices中指定了它的索引位置，所以它才会乖乖听话把四边形画出来
0是左上角的坐标，1是左下角，2是右下角，3是右上角
public class Demo extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
GLSurfaceView v = new GLSurfaceView(this);
v.setRenderer(new OpenGlRender2(null));
setContentView(v);
}
}
public class OpenGlRender2 implements Renderer{
//顶点坐标x,y,z
private float[] vertices=
{
-1f,1f,1f,
-1f,-1f,1f,
1f,-1f,1f,
1f,1f,1f, //前面
1f,1f,1f,
1f,-1f,1f,
1f,-1f,-1f,
1f,1f,-1f, //右面
1f,1f,-1f,
1f,-1f,-1f,
-1f,-1f,-1f,
-1f,1f,-1f, //后面
-1f,1f,-1f,
-1f,-1f,-1f,
-1f,-1f,1f,
-1f,1f,1f, //左面
-1f,1f,-1f,
-1f,1f,1f,
1f,1f,1f,
1f,1f,-1f, //上面
-1f,-1f,1f,
-1f,-1f,-1f,
1f,-1f,-1f,
1f,-1f,1f, //下面
};
//顶点颜色,R,G,B,A
private float[] colors={
0.2f,0f,0.7f,1f,
0f,0.4f,0.3f,1f,
0.8f,0.1f,0.1f,1f,
1f,1f,1f,1f, //前面
0f,1f,0f,1f,
0f,1f,0f,1f,
0f,1f,0f,1f,
0f,1f,0f,1f, //后面
0f,0f,1f,1f,
0f,0f,1f,1f,
0f,0f,1f,1f,
0f,0f,1f,1f, //左面
0.3f,0.5f,1f,1f,
0.3f,0.5f,1f,1f,
0.3f,0.5f,1f,1f,
0.3f,0.5f,1f,1f, //上面
0f,0.2f,0.3f,1f,
0f,0.4f,0.3f,1f,
0f,0.3f,0.3f,1f,
0f,0.4f,0.3f,1f, //下面
};
private short[] indices={
0,1,2,
0,2,3,
4,5,6,
4,6,7,
8,9,10,
8,10,11,
12,13,14,
12,14,15,
16,17,18,
16,18,19,
20,21,22,
20,22,23,
};
private FloatBuffer mVertexBuffer,mColorBuffer;
private ShortBuffer mIndixBuffer;
private float rx=45.0f;
public OpenGlRender2(Bitmap bitmap){
ByteBuffer vbb=ByteBuffer.allocateDirect(vertices.length*4);
vbb.order(ByteOrder.nativeOrder());
mVertexBuffer=vbb.asFloatBuffer();
mVertexBuffer.put(vertices);
mVertexBuffer.position(0);
ByteBuffer ibb = ByteBuffer.allocateDirect(indices.length*2);
ibb.order(ByteOrder.nativeOrder());
mIndixBuffer=ibb.asShortBuffer();
mIndixBuffer.put(indices);
mIndixBuffer.position(0);
ByteBuffer cbb=ByteBuffer.allocateDirect(colors.length*4);
cbb.order(ByteOrder.nativeOrder());
mColorBuffer=cbb.asFloatBuffer();
mColorBuffer.put(colors);
mColorBuffer.position(0);
}
public void onDrawFrame(GL10 gl) {
gl.glClearColor(0f, 0f, 0f, 0.5f);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glFrontFace(GL10.GL_CCW);
gl.glEnable(GL10.GL_CULL_FACE);
gl.glCullFace(GL10.GL_BACK);
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glVertexPointer(3,GL10.GL_FLOAT, 0, mVertexBuffer);
gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
gl.glColorPointer(4, GL10.GL_FLOAT, 0, mColorBuffer);
gl.glLoadIdentity();
// gl.glColor4f(1f, 0f, 0f, 1f);
gl.glTranslatef(0f, 0f, -5f);
gl.glRotatef(-45f, 0f, 1f, 0f);
gl.glRotatef(rx, 1f, 0f, 0f);
gl.glDrawElements(GL10.GL_TRIANGLES, indices.length, GL10.GL_UNSIGNED_SHORT, mIndixBuffer);
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glDisable(GL10.GL_CULL_FACE);
rx++;
}
public void onSurfaceChanged(GL10 gl, int width, int height) {
gl.glViewport(0, 0, width, height);
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
GLU.gluPerspective(gl, 45.0f, (float)width/(float)height, 0.1f, 100.f);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
}
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
//启用深度测试
gl.glEnable(GL10.GL_DEPTH_TEST);
// 所做深度测试的类型
gl.glDepthFunc(GL10.GL_DITHER);
//黑色背景
gl.glClearColor(1f, 0f, 0f, 1f);
//启用阴影平滑
gl.glShadeModel(GL10.GL_SMOOTH);
//清除深度缓存
gl.glClearDepthf(1.0f);
}
分享到：
相关推荐
android opengles 贴图旋转3D立方体,源码和apk
opengles画中画功能
本Demo是在Android Studio上使用OpenGLES画一个立方体,有较详细的注释说明.
使用 OpenGL 绘制立方体，并给立方体表面贴 6 张不同的图片
使用 OpenGL ES 绘制旋转的彩色立方体
opengles绘制立方体
在android 环境下实现用opengl es 2.0画立方体 并且实现手动触摸旋转 完整代码
OpenGL ES之渲染了一个旋转的立方体，并在立方体上面展示图片，形成一个动态的相册展示集锦，运用了GIKit设定状态机、着色器渲染、纹理绘制、动画等多种技术。
实现动画效果ES2Renderer，PaintingView.m
opengles多重纹理
OpenGL详细介绍ppt，讲师所用课件，140页超长版。“OpenGL ES是从OpenGL剪裁或定制过来了,去除了glBegin/glEnd,四边形(GL...的,他们分别又支持common和common lite两种profile.OpenGL ES2.0是参照OpenGL2.0规范定义的”
介绍Android OpenGL ES中，三种可用的抗锯齿实现方式，这里给出详细的代码实现。 文章介绍，请参考： https://blog.csdn.net/xiaxl/article/details/8873018
本规范是本人根据《OpenGL ES Profile Specification 2.0.24 (Difference Specification) (April 1, 2009) (Annotated)》进行学习时翻译的，我今天把它提取出来，仅供大家学习使用，帮助想学习OpenGL ES 2.0这一国内...
OPENGL ES 3.0编程指南
opengles 3.0游戏开发上 的所有案例 opengles 3.0游戏开发上 的所有案例 opengles 3.0游戏开发上 的所有案例
超棒的Android的OpenGL ES入门教程！由 Per-Erik Bergman写的6个教程，并附带一份OpenGL ES 1.1 Reference Pages。 内容介绍： OpenGL ES Tutorial for Android – Part I – Setting up the view OpenGL ES ...
android openGl es2.0以画线的模式画成一个矩形 只有4条边中间透明
android openGL ES 2.0画等边三角形，正方形
OpenGL ES Extension Header File this header is defined to contain all defined extension interfaces for OpenGL ES 2 0 and all later versions since later versions are backwards compatible with OpenGL ...
本资源使用 OpenGL ES 绘制立方体，并实现手动触摸事件控制立方体旋转，相交于之前的版本，解决了立方体低概率裂开问题