From 940b4d1848e8c70ab7642901a68594e8016caffc Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 18:51:28 +0200 Subject: Adding upstream version 1:7.0.4. Signed-off-by: Daniel Baumann --- vcl/opengl/shaders/lineFragmentShader.glsl | 38 ++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 vcl/opengl/shaders/lineFragmentShader.glsl (limited to 'vcl/opengl/shaders/lineFragmentShader.glsl') diff --git a/vcl/opengl/shaders/lineFragmentShader.glsl b/vcl/opengl/shaders/lineFragmentShader.glsl new file mode 100644 index 000000000..c49570be3 --- /dev/null +++ b/vcl/opengl/shaders/lineFragmentShader.glsl @@ -0,0 +1,38 @@ +/* -*- 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 float fade_factor; // 0->1 fade factor used for AA +uniform vec4 color; + +uniform float line_width; +uniform float feather; + +void main() +{ + 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; + + float alpha = clamp(dist, 0.0, 1.0); + + // modify the alpha channel only + vec4 result_color = color; + result_color.a = result_color.a * alpha; + + gl_FragColor = result_color; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ -- cgit v1.2.3