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/*
 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
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 */

package com.sun.webkit.graphics;

import com.sun.javafx.sg.prism.NGCamera;
import com.sun.javafx.sg.prism.NGDefaultCamera;

// WCCamera is based on NGDefaultCamera, but the near and far clip
// values are modified according to WebKit's requirement.
// Refer TextureMapperGL.cpp, createProjectionMatrix function.

// According to w3c spec,
//
// perspective()
//
// specifies a perspective projection matrix. This matrix maps a viewing cube
// onto a pyramid whose base is infinitely far away from the viewer and whose
// peak represents the viewer's position. The viewable area is the region
// bounded by the four edges of the viewport (the portion of the browser window
// used for rendering the webpage between the viewer's position and a point
// at a distance of infinity from the viewer). The depth, given as the
// parameter to the function, represents the distance of the z=0 plane
// from the viewer. Lower values give a more flattened pyramid and therefore
// a more pronounced perspective effect. The value is given in pixels,
// so a value of 1000 gives a moderate amount of foreshortening and a value of
// 200 gives an extreme amount. The matrix is computed by starting with an
// identity matrix and replacing the value at row 3, column 4 with the value
// -1/depth. The value for depth must be greater than zero, otherwise the
// function is invalid.

public class WCCamera extends NGDefaultCamera {

    public static final NGCamera INSTANCE = new WCCamera();

    public void validate(final int w, final int h) {
        if ((w != viewWidth) || (h != viewHeight)) {
            setViewWidth(w);
            setViewHeight(h);

            projViewTx.ortho(0.0, w, h, 0.0, -9999999, 99999);
        }
    }
}