From e4283f6d48b98e764b988b43bbc86b9d52e6ec94 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 19:54:43 +0200 Subject: Adding upstream version 43.9. Signed-off-by: Daniel Baumann --- src/st/st-scroll-view-fade.glsl | 77 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 src/st/st-scroll-view-fade.glsl (limited to 'src/st/st-scroll-view-fade.glsl') diff --git a/src/st/st-scroll-view-fade.glsl b/src/st/st-scroll-view-fade.glsl new file mode 100644 index 0000000..ba6582f --- /dev/null +++ b/src/st/st-scroll-view-fade.glsl @@ -0,0 +1,77 @@ +/* + * st-scroll-view-fade.glsl: Edge fade effect for StScrollView + * + * Copyright 2010 Intel Corporation. + * Copyright 2011 Adel Gadllah + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU Lesser General Public License, + * version 2.1, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT ANY + * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS + * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for + * more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this program. If not, see . + */ + +uniform sampler2D tex; +uniform float height; +uniform float width; +uniform float fade_offset_top; +uniform float fade_offset_bottom; +uniform float fade_offset_left; +uniform float fade_offset_right; +uniform bool fade_edges_top; +uniform bool fade_edges_right; +uniform bool fade_edges_bottom; +uniform bool fade_edges_left; +uniform bool extend_fade_area; + +uniform vec2 fade_area_topleft; +uniform vec2 fade_area_bottomright; + +void main () +{ + cogl_color_out = cogl_color_in * texture2D (tex, vec2 (cogl_tex_coord_in[0].xy)); + + float y = height * cogl_tex_coord_in[0].y; + float x = width * cogl_tex_coord_in[0].x; + float ratio = 1.0; + + if (x > fade_area_topleft[0] && x < fade_area_bottomright[0] && + y > fade_area_topleft[1] && y < fade_area_bottomright[1]) + { + float after_left = x - fade_area_topleft[0]; + float before_right = fade_area_bottomright[0] - x; + float after_top = y - fade_area_topleft[1]; + float before_bottom = fade_area_bottomright[1] - y; + + if (after_top < fade_offset_top && fade_edges_top) { + ratio *= after_top / fade_offset_top; + } + + if (before_bottom < fade_offset_bottom && fade_edges_bottom) { + ratio *= before_bottom / fade_offset_bottom; + } + + if (after_left < fade_offset_left && fade_edges_left) { + ratio *= after_left / fade_offset_left; + } + + if (before_right < fade_offset_right && fade_edges_right) { + ratio *= before_right / fade_offset_right; + } + } else if (extend_fade_area) { + if (x <= fade_area_topleft[0] && fade_edges_left || + x >= fade_area_bottomright[0] && fade_edges_right || + y <= fade_area_topleft[1] && fade_edges_top || + y >= fade_area_bottomright[1] && fade_edges_bottom) { + ratio = 0.0; + } + } + + cogl_color_out *= ratio; +} -- cgit v1.2.3