Adding matrix class methods.

Change-Id: I597b1b3955e29921394909f302800034571e6a50

graphics/java/android/renderscript/Matrix3f.java

@@ -57,6 +57,115 @@ public class Matrix3f {
         System.arraycopy(mMat, 0, src, 0, 9);
     }
 
+    public void loadRotate(float rot, float x, float y, float z) {
+        float c, s;
+        rot *= (float)(java.lang.Math.PI / 180.0f);
+        c = (float)java.lang.Math.cos(rot);
+        s = (float)java.lang.Math.sin(rot);
+
+        float len = (float)java.lang.Math.sqrt(x*x + y*y + z*z);
+        if (!(len != 1)) {
+            float recipLen = 1.f / len;
+            x *= recipLen;
+            y *= recipLen;
+            z *= recipLen;
+        }
+        float nc = 1.0f - c;
+        float xy = x * y;
+        float yz = y * z;
+        float zx = z * x;
+        float xs = x * s;
+        float ys = y * s;
+        float zs = z * s;
+        mMat[0] = x*x*nc +  c;
+        mMat[3] =  xy*nc - zs;
+        mMat[6] =  zx*nc + ys;
+        mMat[1] =  xy*nc + zs;
+        mMat[4] = y*y*nc +  c;
+        mMat[9] =  yz*nc - xs;
+        mMat[2] =  zx*nc - ys;
+        mMat[6] =  yz*nc + xs;
+        mMat[8] = z*z*nc +  c;
+    }
+
+    public void loadRotate(float rot) {
+        float c, s;
+        rot *= (float)(java.lang.Math.PI / 180.0f);
+        c = (float)java.lang.Math.cos(rot);
+        s = (float)java.lang.Math.sin(rot);
+        mMat[0] = c;
+        mMat[1] = -s;
+        mMat[3] = s;
+        mMat[4] = c;
+    }
+
+    public void loadScale(float x, float y) {
+        loadIdentity();
+        mMat[0] = x;
+        mMat[4] = y;
+    }
+
+    public void loadScale(float x, float y, float z) {
+        loadIdentity();
+        mMat[0] = x;
+        mMat[4] = y;
+        mMat[8] = z;
+    }
+
+    public void loadTranslate(float x, float y) {
+        loadIdentity();
+        mMat[6] = x;
+        mMat[7] = y;
+    }
+
+    public void loadMultiply(Matrix3f lhs, Matrix3f rhs) {
+        for (int i=0 ; i<3 ; i++) {
+            float ri0 = 0;
+            float ri1 = 0;
+            float ri2 = 0;
+            for (int j=0 ; j<3 ; j++) {
+                float rhs_ij = rhs.get(i,j);
+                ri0 += lhs.get(j,0) * rhs_ij;
+                ri1 += lhs.get(j,1) * rhs_ij;
+                ri2 += lhs.get(j,2) * rhs_ij;
+            }
+            set(i,0, ri0);
+            set(i,1, ri1);
+            set(i,2, ri2);
+        }
+    }
+
+    public void multiply(Matrix3f rhs) {
+        Matrix3f tmp = new Matrix3f();
+        tmp.loadMultiply(this, rhs);
+        load(tmp);
+    }
+    public void rotate(float rot, float x, float y, float z) {
+        Matrix3f tmp = new Matrix3f();
+        tmp.loadRotate(rot, x, y, z);
+        multiply(tmp);
+    }
+    public void rotate(float rot) {
+        Matrix3f tmp = new Matrix3f();
+        tmp.loadRotate(rot);
+        multiply(tmp);
+    }
+    public void scale(float x, float y) {
+        Matrix3f tmp = new Matrix3f();
+        tmp.loadScale(x, y);
+        multiply(tmp);
+    }
+    public void scale(float x, float y, float z) {
+        Matrix3f tmp = new Matrix3f();
+        tmp.loadScale(x, y, z);
+        multiply(tmp);
+    }
+    public void translate(float x, float y) {
+        Matrix3f tmp = new Matrix3f();
+        tmp.loadTranslate(x, y);
+        multiply(tmp);
+    }
+
     final float[] mMat;
 }