Function perspective

stackgl_modules/index.js:16415–16435

* Generates a perspective projection matrix with the given bounds * * @param {mat4} out mat4 frustum matrix will be written into * @param {number} fovy Vertical field of view in radians * @param {number} aspect Aspect ratio. typically viewport width/height * @param {number} near Near bound of t

(out, fovy, aspect, near, far)

 * @returns {mat4} out
 */
function perspective(out, fovy, aspect, near, far) {
    var f = 1.0 / Math.tan(fovy / 2),
        nf = 1 / (near - far);
    out[0] = f / aspect;
    out[1] = 0;
    out[2] = 0;
    out[3] = 0;
    out[4] = 0;
    out[5] = f;
    out[6] = 0;
    out[7] = 0;
    out[8] = 0;
    out[9] = 0;
    out[10] = (far + near) * nf;
    out[11] = -1;
    out[12] = 0;
    out[13] = 0;
    out[14] = (2 * far * near) * nf;
    out[15] = 0;
    return out;
};

/***/ }),