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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
varying vec2 tex_coord;
varying vec2 alpha_coord;
varying vec2 mask_coord;
uniform sampler2D texture;
uniform sampler2D mask;
uniform sampler2D alpha;
uniform vec4 color;
uniform int type;
#define TYPE_NORMAL 0
#define TYPE_BLEND 1
#define TYPE_MASKED 2
#define TYPE_DIFF 3
#define TYPE_MASKED_COLOR 4
void main()
{
vec4 texelTexture = texture2D(texture, tex_coord);
if (type == TYPE_NORMAL)
{
gl_FragColor = texelTexture;
}
else if (type == TYPE_BLEND)
{
vec4 texelMask = texture2D(mask, mask_coord);
vec4 texelAlpha = texture2D(alpha, alpha_coord);
gl_FragColor = texelTexture;
gl_FragColor.a = 1.0 - (1.0 - floor(texelAlpha.r)) * texelMask.r;
}
else if (type == TYPE_MASKED)
{
vec4 texelMask = texture2D(mask, mask_coord);
gl_FragColor = texelTexture;
gl_FragColor.a = 1.0 - texelMask.r;
}
else if (type == TYPE_DIFF)
{
vec4 texelMask = texture2D(mask, mask_coord);
float alpha = 1.0 - abs(texelTexture.r - texelMask.r);
if (alpha > 0.0)
gl_FragColor = texelMask / alpha;
gl_FragColor.a = alpha;
}
else if (type == TYPE_MASKED_COLOR)
{
gl_FragColor = color;
gl_FragColor.a = 1.0 - texelTexture.r;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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