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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/. */ #version 130 varying vec2 tex_coord; varying vec2 alpha_coord; varying vec2 mask_coord; #ifdef USE_VERTEX_COLORS varying vec4 vertex_color; #endif 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) { #ifdef USE_VERTEX_COLORS gl_FragColor = vertex_color; #else gl_FragColor = color; #endif gl_FragColor.a = 1.0 - texelTexture.r; } } /* vim:set shiftwidth=4 softtabstop=4 expandtab: */