OpenGL es2.0 配置自己的matrix

</pre><pre name="code" class="java">package com.gzdxid.utils;import java.nio.ByteBuffer;import java.nio.ByteOrder;import java.nio.FloatBuffer;import android.opengl.Matrix;public class MatrixState {    private static float[] mProjMatrix = new float[16];//4x4矩阵 投影用    private static float[] mVMatrix = new float[16];//摄像机位置朝向9参数矩阵       private static float[] currMatrix;//当前变换矩阵    public static float[] lightLocation=new float[]{0,0,0};//定位光光源位置    public static FloatBuffer cameraFB;        public static FloatBuffer lightPositionFB;          //保护变换矩阵的栈    static float[][] mStack=new float[10][16];    public static int stackTop=-1;        public static void setInitStack()//获取不变换初始矩阵    {    currMatrix=new float[16];    Matrix.setRotateM(currMatrix, 0, 0, 1, 0, 0);    }        public static void pushMatrix()//保护变换矩阵    {    stackTop++;    for(int i=0;i<16;i++)    {    mStack[stackTop][i]=currMatrix[i];    }    }        public static void popMatrix()//恢复变换矩阵    {    for(int i=0;i<16;i++)    {    currMatrix[i]=mStack[stackTop][i];    }    stackTop--;    }        public static void translate(float x,float y,float z)//设置沿xyz轴移动    {    Matrix.translateM(currMatrix, 0, x, y, z);    }        public static void rotate(float angle,float x,float y,float z)//设置绕xyz轴移动    {    Matrix.rotateM(currMatrix,0,angle,x,y,z);    }        public static void scale(float x,float y,float z)    {    Matrix.scaleM(currMatrix,0, x, y, z);    }        //插入自带矩阵    public static void matrix(float[] self)    {    float[] result=new float[16];    Matrix.multiplyMM(result,0,currMatrix,0,self,0);    currMatrix=result;    }            //设置摄像机    static ByteBuffer llbb= ByteBuffer.allocateDirect(3*4);    static float[] cameraLocation=new float[3];//摄像机位置    public static void setCamera    (    float cx,//摄像机位置x    float cy,   //摄像机位置y    float cz,   //摄像机位置z    float tx,   //摄像机目标点x    float ty,   //摄像机目标点y    float tz,   //摄像机目标点z    float upx,  //摄像机UP向量X分量    float upy,  //摄像机UP向量Y分量    float upz   //摄像机UP向量Z分量    )    {        Matrix.setLookAtM            (            mVMatrix,             0,             cx,            cy,            cz,            tx,            ty,            tz,            upx,            upy,            upz            );                cameraLocation[0]=cx;        cameraLocation[1]=cy;        cameraLocation[2]=cz;                llbb.clear();            llbb.order(ByteOrder.nativeOrder());//设置字节顺序            cameraFB=llbb.asFloatBuffer();            cameraFB.put(cameraLocation);            cameraFB.position(0);      }        //设置透视投影参数    public static void setProjectFrustum    (     float left,//near面的left    float right,    //near面的right    float bottom,   //near面的bottom    float top,      //near面的top    float near,//near面距离    float far       //far面距离    )    {    Matrix.frustumM(mProjMatrix, 0, left, right, bottom, top, near, far);    }        //设置正交投影参数    public static void setProjectOrtho    (    float left,//near面的left    float right,    //near面的right    float bottom,   //near面的bottom    float top,      //near面的top    float near,//near面距离    float far       //far面距离    )    {        Matrix.orthoM(mProjMatrix, 0, left, right, bottom, top, near, far);    }           //用于一帧内的摄像机矩阵    private static float[] mVMatrixForSpecFrame = new float[16];//摄像机位置朝向9参数矩阵       public static void copyMVMatrix()    {for(int i=0;i<16;i++)    {    mVMatrixForSpecFrame[i]=mVMatrix[i];            }    }        //获取具体物体的总变换矩阵    static float[] mMVPMatrix=new float[16];    public static float[] getFinalMatrix()    {    Matrix.multiplyMM(mMVPMatrix, 0, mVMatrixForSpecFrame, 0, currMatrix, 0);        Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mMVPMatrix, 0);                return mMVPMatrix;    }        //获取具体物体的变换矩阵    public static float[] getMMatrix()    {               return currMatrix;    }        //设置灯光位置的方法    static ByteBuffer llbbL = ByteBuffer.allocateDirect(3*4);    public static void setLightLocation(float x,float y,float z)    {    llbbL.clear();        lightLocation[0]=x;    lightLocation[1]=y;    lightLocation[2]=z;            llbbL.order(ByteOrder.nativeOrder());//设置字节顺序        lightPositionFB=llbbL.asFloatBuffer();        lightPositionFB.put(lightLocation);        lightPositionFB.position(0);    }}