Merge "Add utility method Matrix.perspectiveM"

    method public static void multiplyMM(float[], int, float[], int, float[], int);

    method public static void multiplyMV(float[], int, float[], int, float[], int);

    method public static void orthoM(float[], int, float, float, float, float, float, float);

    method public static void perspectiveM(float[], int, float, float, float, float);

    method public static void rotateM(float[], int, float[], int, float, float, float, float);

    method public static void rotateM(float[], int, float, float, float, float);

    method public static void scaleM(float[], int, float[], int, float, float, float);

package android.opengl;

import javax.microedition.khronos.opengles.GL10;

/**

 * Matrix math utilities. These methods operate on OpenGL ES format

 * matrices and vectors stored in float arrays.

        m[offset + 15] = 0.0f;

    }

    /**

     * Define a projection matrix in terms of a field of view angle, an

     * aspect ratio, and z clip planes

     * @param m the float array that holds the perspective matrix

     * @param offset the offset into float array m where the perspective

     * matrix data is written

     * @param fovy field of view in y direction, in degrees

     * @param aspect width to height aspect ratio of the viewport

     * @param zNear

     * @param zFar

     */

    public static void perspectiveM(float[] m, int offset,

          float fovy, float aspect, float zNear, float zFar) {

        float f = 1.0f / (float) Math.tan(fovy * (Math.PI / 360.0));

        float rangeReciprocal = 1.0f / (zNear - zFar);

        m[offset + 0] = f / aspect;

        m[offset + 1] = 0.0f;

        m[offset + 2] = 0.0f;

        m[offset + 3] = 0.0f;

        m[offset + 4] = 0.0f;

        m[offset + 5] = f;

        m[offset + 6] = 0.0f;

        m[offset + 7] = 0.0f;

        m[offset + 8] = 0.0f;

        m[offset + 9] = 0.0f;

        m[offset + 10] = (zFar + zNear) * rangeReciprocal;

        m[offset + 11] = -1.0f;

        m[offset + 12] = 0.0f;

        m[offset + 13] = 0.0f;

        m[offset + 14] = 2.0f * zFar * rangeReciprocal;

        m[offset + 15] = 0.0f;

    }

    /**

     * Computes the length of a vector

     *