5d65a424a8
The shader code currently only accounts for padding for the bottom and right fades, but not for top and left. As a result, we only fade the right edge when swiping through app picker pages, whoops. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1569>
77 lines
2.7 KiB
GLSL
77 lines
2.7 KiB
GLSL
/*
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* st-scroll-view-fade.glsl: Edge fade effect for StScrollView
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*
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* Copyright 2010 Intel Corporation.
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* Copyright 2011 Adel Gadllah
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU Lesser General Public License,
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* version 2.1, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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* more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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uniform sampler2D tex;
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uniform float height;
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uniform float width;
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uniform float vfade_offset;
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uniform float hfade_offset;
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uniform bool fade_edges_top;
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uniform bool fade_edges_right;
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uniform bool fade_edges_bottom;
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uniform bool fade_edges_left;
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uniform vec2 fade_area_topleft;
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uniform vec2 fade_area_bottomright;
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void main ()
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{
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cogl_color_out = cogl_color_in * texture2D (tex, vec2 (cogl_tex_coord_in[0].xy));
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float y = height * cogl_tex_coord_in[0].y;
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float x = width * cogl_tex_coord_in[0].x;
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/*
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* We cannot just return here due to a bug in llvmpipe see:
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* https://bugzilla.freedesktop.org/show_bug.cgi?id=62357
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*/
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if (x > fade_area_topleft[0] && x < fade_area_bottomright[0] &&
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y > fade_area_topleft[1] && y < fade_area_bottomright[1]) {
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float ratio = 1.0;
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float fade_top_start = fade_area_topleft[1] + vfade_offset;
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float fade_left_start = fade_area_topleft[0] + hfade_offset;
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float fade_bottom_start = fade_area_bottomright[1] - vfade_offset;
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float fade_right_start = fade_area_bottomright[0] - hfade_offset;
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bool fade_top = y < vfade_offset && fade_edges_top;
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bool fade_bottom = y > fade_bottom_start && fade_edges_bottom;
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bool fade_left = x < fade_left_start && fade_edges_left;
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bool fade_right = x > fade_right_start && fade_edges_right;
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float vfade_scale = height / vfade_offset;
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if (fade_top) {
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ratio *= (fade_area_topleft[1] - y) / (fade_area_topleft[1] - fade_bottom_start);
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}
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if (fade_bottom) {
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ratio *= (fade_area_bottomright[1] - y) / (fade_area_bottomright[1] - fade_bottom_start);
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}
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float hfade_scale = width / hfade_offset;
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if (fade_left) {
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ratio *= (fade_area_topleft[0] - x) / (fade_area_topleft[0] - fade_left_start);
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}
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if (fade_right) {
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ratio *= (fade_area_bottomright[0] - x) / (fade_area_bottomright[0] - fade_right_start);
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}
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cogl_color_out *= ratio;
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}
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}
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