jsl-prism.MaskDrawEllipse.jsl Maven / Gradle / Ivy

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This contains the native files for the backport of OpenJFX 8 to run on Java 7.

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/*
 * Copyright (c) 2010, 2013, 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
 * questions.
 */

param float2 idim;

// See MaskFillEllipse.jsl for a description of the coordinate system and
// parameters used by these calculations.  This shader simply performs those
// calculations twice, once with the values for the outer ellipse and again
// with the values for the inner ellipse, then subtracts the 2 coverages.

float ellipsemask(float2 abstco, float2 invarcradii)
{
    float2 absecctco = abstco * invarcradii;
    float ecclensq = dot(absecctco, absecctco);
    float delta = dot(absecctco, invarcradii) * 2.0;
    return clamp(0.5 + (1.0 - ecclensq)/delta, 0.0, 1.0);
}

float mask(float2 tco, float2 odim)
{
    // How far are we from the center?
    //float distance = length(tco);
    float2 abstco = abs(tco);

    float ocov = ellipsemask(abstco, odim);
    float icov = ellipsemask(abstco, idim);
    
    return clamp(ocov - icov, 0.0, 1.0);
}