74 lines
1.8 KiB
Java
74 lines
1.8 KiB
Java
/* -*- 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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#version 130
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varying vec2 tex_coord;
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varying vec2 alpha_coord;
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varying vec2 mask_coord;
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#ifdef USE_VERTEX_COLORS
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varying vec4 vertex_color;
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#endif
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uniform sampler2D texture;
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uniform sampler2D mask;
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uniform sampler2D alpha;
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uniform vec4 color;
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uniform int type;
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#define TYPE_NORMAL 0
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#define TYPE_BLEND 1
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#define TYPE_MASKED 2
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#define TYPE_DIFF 3
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#define TYPE_MASKED_COLOR 4
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void main()
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{
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vec4 texelTexture = texture2D(texture, tex_coord);
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if (type == TYPE_NORMAL)
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{
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gl_FragColor = texelTexture;
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}
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else if (type == TYPE_BLEND)
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{
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vec4 texelMask = texture2D(mask, mask_coord);
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vec4 texelAlpha = texture2D(alpha, alpha_coord);
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gl_FragColor = texelTexture;
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gl_FragColor.a = 1.0 - (1.0 - floor(texelAlpha.r)) * texelMask.r;
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}
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else if (type == TYPE_MASKED)
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{
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vec4 texelMask = texture2D(mask, mask_coord);
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gl_FragColor = texelTexture;
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gl_FragColor.a = 1.0 - texelMask.r;
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}
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else if (type == TYPE_DIFF)
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{
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vec4 texelMask = texture2D(mask, mask_coord);
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float alpha = 1.0 - abs(texelTexture.r - texelMask.r);
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if (alpha > 0.0)
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gl_FragColor = texelMask / alpha;
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gl_FragColor.a = alpha;
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}
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else if (type == TYPE_MASKED_COLOR)
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{
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#ifdef USE_VERTEX_COLORS
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gl_FragColor = vertex_color;
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#else
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gl_FragColor = color;
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#endif
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gl_FragColor.a = 1.0 - texelTexture.r;
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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