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Diffstat (limited to 'vcl/opengl/combinedFragmentShader.glsl')
-rw-r--r-- | vcl/opengl/combinedFragmentShader.glsl | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/vcl/opengl/combinedFragmentShader.glsl b/vcl/opengl/combinedFragmentShader.glsl new file mode 100644 index 000000000000..c44e75c09373 --- /dev/null +++ b/vcl/opengl/combinedFragmentShader.glsl @@ -0,0 +1,45 @@ +/* -*- 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 float fade_factor; // 0->1 fade factor used for AA +uniform vec4 color; + +uniform float line_width; +uniform float feather; + +#define TYPE_NORMAL 0 +#define TYPE_LINE 1 + +uniform int type; + +void main() +{ + float alpha = 1.0; + + if (type == TYPE_LINE) + { + float start = (line_width / 2.0) - feather; // where we start to apply alpha + float end = (line_width / 2.0) + feather; // where we end to apply alpha + + // Calculate the multiplier so we can transform the 0->1 fade factor + // to take feather and line width into account. + float multiplied = 1.0 / (1.0 - (start / end)); + + float dist = (1.0 - abs(fade_factor)) * multiplied; + + alpha = clamp(dist, 0.0, 1.0); + } + + vec4 result_color = color; + result_color.a = result_color.a * alpha; + + gl_FragColor = result_color; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |