var BABYLON;
(function (BABYLON) {
    var Internals;
    (function (Internals) {
        /**
         * Helper class usefull to convert panorama picture to their cubemap representation in 6 faces.
         */
        var PanoramaToCubeMapTools = (function () {
            function PanoramaToCubeMapTools() {
            }
            /**
             * Converts a panorma stored in RGB right to left up to down format into a cubemap (6 faces).
             *
             * @param float32Array The source data.
             * @param inputWidth The width of the input panorama.
             * @param inputhHeight The height of the input panorama.
             * @param size The willing size of the generated cubemap (each faces will be size * size pixels)
             * @return The cubemap data
             */
            PanoramaToCubeMapTools.ConvertPanoramaToCubemap = function (float32Array, inputWidth, inputHeight, size) {
                if (!float32Array) {
                    throw "ConvertPanoramaToCubemap: input cannot be null";
                }
                if (float32Array.length != inputWidth * inputHeight * 3) {
                    throw "ConvertPanoramaToCubemap: input size is wrong";
                }
                var textureFront = this.CreateCubemapTexture(size, this.FACE_FRONT, float32Array, inputWidth, inputHeight);
                var textureBack = this.CreateCubemapTexture(size, this.FACE_BACK, float32Array, inputWidth, inputHeight);
                var textureLeft = this.CreateCubemapTexture(size, this.FACE_LEFT, float32Array, inputWidth, inputHeight);
                var textureRight = this.CreateCubemapTexture(size, this.FACE_RIGHT, float32Array, inputWidth, inputHeight);
                var textureUp = this.CreateCubemapTexture(size, this.FACE_UP, float32Array, inputWidth, inputHeight);
                var textureDown = this.CreateCubemapTexture(size, this.FACE_DOWN, float32Array, inputWidth, inputHeight);
                return {
                    front: textureFront,
                    back: textureBack,
                    left: textureLeft,
                    right: textureRight,
                    up: textureUp,
                    down: textureDown,
                    size: size
                };
            };
            PanoramaToCubeMapTools.CreateCubemapTexture = function (texSize, faceData, float32Array, inputWidth, inputHeight) {
                var buffer = new ArrayBuffer(texSize * texSize * 4 * 3);
                var textureArray = new Float32Array(buffer);
                var rotDX1 = faceData[1].subtract(faceData[0]).scale(1 / texSize);
                var rotDX2 = faceData[3].subtract(faceData[2]).scale(1 / texSize);
                var dy = 1 / texSize;
                var fy = 0;
                for (var y = 0; y < texSize; y++) {
                    var xv1 = faceData[0];
                    var xv2 = faceData[2];
                    for (var x = 0; x < texSize; x++) {
                        var v = xv2.subtract(xv1).scale(fy).add(xv1);
                        v.normalize();
                        var color = this.CalcProjectionSpherical(v, float32Array, inputWidth, inputHeight);
                        // 3 channels per pixels
                        textureArray[y * texSize * 3 + (x * 3) + 0] = color.r;
                        textureArray[y * texSize * 3 + (x * 3) + 1] = color.g;
                        textureArray[y * texSize * 3 + (x * 3) + 2] = color.b;
                        xv1 = xv1.add(rotDX1);
                        xv2 = xv2.add(rotDX2);
                    }
                    fy += dy;
                }
                return textureArray;
            };
            PanoramaToCubeMapTools.CalcProjectionSpherical = function (vDir, float32Array, inputWidth, inputHeight) {
                var theta = Math.atan2(vDir.z, vDir.x);
                var phi = Math.acos(vDir.y);
                while (theta < -Math.PI)
                    theta += 2 * Math.PI;
                while (theta > Math.PI)
                    theta -= 2 * Math.PI;
                var dx = theta / Math.PI;
                var dy = phi / Math.PI;
                // recenter.
                dx = dx * 0.5 + 0.5;
                var px = Math.round(dx * inputWidth);
                if (px < 0)
                    px = 0;
                else if (px >= inputWidth)
                    px = inputWidth - 1;
                var py = Math.round(dy * inputHeight);
                if (py < 0)
                    py = 0;
                else if (py >= inputHeight)
                    py = inputHeight - 1;
                var inputY = (inputHeight - py - 1);
                var r = float32Array[inputY * inputWidth * 3 + (px * 3) + 0];
                var g = float32Array[inputY * inputWidth * 3 + (px * 3) + 1];
                var b = float32Array[inputY * inputWidth * 3 + (px * 3) + 2];
                return {
                    r: r,
                    g: g,
                    b: b
                };
            };
            PanoramaToCubeMapTools.FACE_FRONT = [
                new BABYLON.Vector3(-1.0, -1.0, -1.0),
                new BABYLON.Vector3(1.0, -1.0, -1.0),
                new BABYLON.Vector3(-1.0, 1.0, -1.0),
                new BABYLON.Vector3(1.0, 1.0, -1.0)
            ];
            PanoramaToCubeMapTools.FACE_BACK = [
                new BABYLON.Vector3(1.0, -1.0, 1.0),
                new BABYLON.Vector3(-1.0, -1.0, 1.0),
                new BABYLON.Vector3(1.0, 1.0, 1.0),
                new BABYLON.Vector3(-1.0, 1.0, 1.0)
            ];
            PanoramaToCubeMapTools.FACE_RIGHT = [
                new BABYLON.Vector3(1.0, -1.0, -1.0),
                new BABYLON.Vector3(1.0, -1.0, 1.0),
                new BABYLON.Vector3(1.0, 1.0, -1.0),
                new BABYLON.Vector3(1.0, 1.0, 1.0)
            ];
            PanoramaToCubeMapTools.FACE_LEFT = [
                new BABYLON.Vector3(-1.0, -1.0, 1.0),
                new BABYLON.Vector3(-1.0, -1.0, -1.0),
                new BABYLON.Vector3(-1.0, 1.0, 1.0),
                new BABYLON.Vector3(-1.0, 1.0, -1.0)
            ];
            PanoramaToCubeMapTools.FACE_DOWN = [
                new BABYLON.Vector3(-1.0, 1.0, -1.0),
                new BABYLON.Vector3(1.0, 1.0, -1.0),
                new BABYLON.Vector3(-1.0, 1.0, 1.0),
                new BABYLON.Vector3(1.0, 1.0, 1.0)
            ];
            PanoramaToCubeMapTools.FACE_UP = [
                new BABYLON.Vector3(-1.0, -1.0, 1.0),
                new BABYLON.Vector3(1.0, -1.0, 1.0),
                new BABYLON.Vector3(-1.0, -1.0, -1.0),
                new BABYLON.Vector3(1.0, -1.0, -1.0)
            ];
            return PanoramaToCubeMapTools;
        }());
        Internals.PanoramaToCubeMapTools = PanoramaToCubeMapTools;
    })(Internals = BABYLON.Internals || (BABYLON.Internals = {}));
})(BABYLON || (BABYLON = {}));