Android之GLSurfaceView立方体各面不同图片纹理测试代码2

创建4个顶点构成的一个面，不同的面依次先对该面纹理贴图，然后根据贴图的面进行变换来得到不同的面，最后就可组装成一个立方体了。 之前的《Android之GLSurfaceView立方体各面不同图片纹理测试代码》则为一次性创建上所有的顶点，然后分别对各自的面进行纹理贴图显示的立方体。

public class MainActivity extends Activity {

private GLSurfaceView mGLView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

mGLView = new DemoGLSurfaceView(this);
setContentView(mGLView);
}
}
class DemoGLSurfaceView extends GLSurfaceView{
DomeGLRender mRenderer;
public DemoGLSurfaceView(Context context) {
super(context);
mRenderer = new DomeGLRender(context.getResources());
this.setRenderer(mRenderer);
}

public boolean onTouchEvent(final MotionEvent event){
this.queueEvent(new Runnable() {
@Override
public void run() {
if(mRenderer.bLight){
mRenderer.bLight = false;
}else{
mRenderer.bLight = true;
}
}
});
return true;
}
}

class DomeGLRender implements Renderer  {

public boolean bLight = true;//是否开启灯光
private float[] vertices = { // 定义一个面的顶点坐标
-1.0f, -1.0f, 0.0f,  // 0. 左-底-前
1.0f, -1.0f, 0.0f,   // 1. 右-底-前
-1.0f,  1.0f, 0.0f,  // 2. 左-顶-前
1.0f,  1.0f, 0.0f    // 3. 右-顶-前
};
private float[] textCood = {
0.0f, 1.0f,  // A. 左-下
1.0f, 1.0f,  // B. 右-下
0.0f, 0.0f,  // C. 左-上
1.0f, 0.0f   // D. 右-上
};

float xrot,yrot; //旋转
private int[] textures = new int[1];
private FloatBuffer vertexBuffer; //顶点缓冲
private FloatBuffer textCoodBuffer; //纹理缓冲

//环境光
private float[] lightAmbient = {0.5f,0.5f,0.5f,1.0f};
private FloatBuffer AmbientBuffer;
//漫射光
private float[] lightDiffuse = {1.0f,1.0f,1.0f,1.0f};
private FloatBuffer diffuseBuffer;
//光源位置
private float[] lightPosition = {0.0f,0.0f,2.0f,1.0f};
private FloatBuffer positionBuffer;
//图片数组
public static Bitmap[] mBitmap = new Bitmap[6];
//变换角度
private float[] angle = {0.0f, 90.0f, 180.0f, 270.0f, 90.0f, 270.0f};
//构造函数
public DomeGLRender(Resources resources){
mBitmap[0] = BitmapFactory.decodeResource(resources, R.drawable.img0);
mBitmap[1] = BitmapFactory.decodeResource(resources, R.drawable.img1);
mBitmap[2] = BitmapFactory.decodeResource(resources, R.drawable.img2);
mBitmap[3] = BitmapFactory.decodeResource(resources, R.drawable.img0);
mBitmap[4] = BitmapFactory.decodeResource(resources, R.drawable.img1);
mBitmap[5] = BitmapFactory.decodeResource(resources, R.drawable.img2);

//顶点
ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length * 4);
vbb.order(ByteOrder.nativeOrder());
vertexBuffer = vbb.asFloatBuffer();
vertexBuffer.put(vertices);
vertexBuffer.position(0);

//纹理
ByteBuffer tbb = ByteBuffer.allocateDirect(textCood.length * 4);
tbb.order(ByteOrder.nativeOrder());
textCoodBuffer = tbb.asFloatBuffer();
textCoodBuffer.put(textCood);
textCoodBuffer.position(0);

//环境光
ByteBuffer ambientbb = ByteBuffer.allocateDirect(lightAmbient.length * 4);
ambientbb.order(ByteOrder.nativeOrder());
AmbientBuffer = ambientbb.asFloatBuffer();
AmbientBuffer.put(lightAmbient);
AmbientBuffer.position(0);

//漫射光
ByteBuffer diffusebb = ByteBuffer.allocateDirect(lightDiffuse.length * 4);
diffusebb.order(ByteOrder.nativeOrder());
diffuseBuffer = diffusebb.asFloatBuffer();
diffuseBuffer.put(lightDiffuse);
diffuseBuffer.position(0);

//灯光位置
ByteBuffer positionbb = ByteBuffer.allocateDirect(lightPosition.length * 4);
positionbb.order(ByteOrder.nativeOrder());
positionBuffer = positionbb.asFloatBuffer();
positionBuffer.put(lightPosition);
positionBuffer.position(0);

}

@Override
public void onDrawFrame(GL10 gl) {
//清除颜色和深度缓存
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity();

//启用灯光
gl.glEnable(GL10.GL_LIGHTING);

//启用顶点和纹理缓存
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
//移动和旋转设置
gl.glTranslatef(0.0f, 0.0f, -6.0f);
gl.glRotatef(xrot, 1.0f, 0.0f, 0.0f);
gl.glRotatef(yrot, 0.0f, 1.0f, 0.0f);

gl.glFrontFace(GL10.GL_CCW);    // 正前面为逆时针方向
gl.glEnable(GL10.GL_CULL_FACE); // 使能剔除面
gl.glCullFace(GL10.GL_BACK);    // 剔除背面（不显示）

gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);  // 使能纹理坐标数组
gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, textCoodBuffer); // 定义纹理坐标数组缓冲区

//绘制六个面，贴图
for (int i = 0; i < 6; i++) {
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, mBitmap[i], 0);
gl.glPushMatrix();
if(i < 4)
gl.glRotatef(angle[i], 0.0f, 1.0f, 0.0f);//y轴为中心变换
else
gl.glRotatef(angle[i], 1.0f, 0.0f, 0.0f);//x轴为中心变换
gl.glTranslatef(0.0f, 0.0f, 1.0f);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4);
gl.glPopMatrix();
}

// 恢复原来的状态
gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glDisable(GL10.GL_CULL_FACE);

xrot += 0.5f;
yrot += 0.5f;

if (!bLight) {
gl.glDisable(GL10.GL_LIGHT1);
} else {
gl.glEnable(GL10.GL_LIGHT1);
}
}

@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
//场景大小
gl.glViewport(0, 0, width, height);
float ratio = (float) width / height;
//投影矩阵
gl.glMatrixMode(GL10.GL_PROJECTION);
//重置下
gl.glLoadIdentity();

// 设置视图区域的大小
GLU.gluPerspective(gl, 45.0f, (float)width/(float)height,0.1f,100.0f);
// 选择模型观察矩阵
gl.glMatrixMode(GL10.GL_MODELVIEW);
// 重置模型观察矩阵
gl.glLoadIdentity();
}

@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
//透视效果
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
//清屏
gl.glClearColor(0, 0, 0, 0);
//启用阴影平滑
gl.glShadeModel(GL10.GL_SMOOTH);
//清除深度缓存
gl.glClearDepthf(1f);
//启用深度缓存
gl.glEnable(GL10.GL_DEPTH_TEST);
//深度缓存模式
gl.glDepthFunc(GL10.GL_LEQUAL);

//启用纹理
gl.glEnable(GL10.GL_TEXTURE_2D);
//创建纹理
gl.glGenTextures(1, textures, 0);
//绑定纹理
gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
//生成纹理
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, mBitmap[0], 0);
//线性滤波处理
gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER,  GL10.GL_LINEAR);
gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER,  GL10.GL_LINEAR);

//设置环境光
gl.glLightfv(GL10.GL_LIGHT1, GL10.GL_AMBIENT, AmbientBuffer);
//设置漫射光
gl.glLightfv(GL10.GL_LIGHT1, GL10.GL_DIFFUSE, diffuseBuffer);
//设置灯光位置
gl.glLightfv(GL10.GL_LIGHT1, GL10.GL_POSITION, positionBuffer);
//启用1号灯光
gl.glEnable(GL10.GL_LIGHT1);
}
}

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