bdce4e2919
If using the same texture to store the image and mask data (for example when using texture atlas) the mask and image (RGB) coords aren't the same anymore. With this commit we always define the mask coords separately. Change-Id: Ie33f87a6e9ab398972c6a3d5938e5f1364c82d36
29 lines
849 B
GLSL
29 lines
849 B
GLSL
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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/*precision mediump float;*/
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varying vec2 tex_coord;
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varying vec2 mask_coord;
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uniform sampler2D texture; /* white background */
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uniform sampler2D mask; /* black background */
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void main()
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{
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float alpha;
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vec4 texel0, texel1;
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texel0 = texture2D(texture, tex_coord);
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texel1 = texture2D(mask, mask_coord);
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alpha = 1.0 - abs(texel0.r - texel1.r);
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if(alpha > 0.0)
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gl_FragColor = texel1 / alpha;
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gl_FragColor.a = alpha;
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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