7e0c6dc2c1
The shader was using too many ALU instructions for Intel 945GM hardware, so simplify it a bit. The resulting math is the same, but a few redundant operations have been removed. Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4883 Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2072>
78 lines
2.6 KiB
GLSL
78 lines
2.6 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 fade_offset_top;
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uniform float fade_offset_bottom;
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uniform float fade_offset_left;
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uniform float fade_offset_right;
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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 bool extend_fade_area;
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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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float ratio = 1.0;
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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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{
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float after_left = x - fade_area_topleft[0];
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float before_right = fade_area_bottomright[0] - x;
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float after_top = y - fade_area_topleft[1];
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float before_bottom = fade_area_bottomright[1] - y;
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if (after_top < fade_offset_top && fade_edges_top) {
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ratio *= after_top / fade_offset_top;
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}
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if (before_bottom < fade_offset_bottom && fade_edges_bottom) {
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ratio *= before_bottom / fade_offset_bottom;
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}
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if (after_left < fade_offset_left && fade_edges_left) {
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ratio *= after_left / fade_offset_left;
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}
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if (before_right < fade_offset_right && fade_edges_right) {
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ratio *= before_right / fade_offset_right;
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}
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} else if (extend_fade_area) {
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if (x <= fade_area_topleft[0] && fade_edges_left ||
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x >= fade_area_bottomright[0] && fade_edges_right ||
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y <= fade_area_topleft[1] && fade_edges_top ||
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y >= fade_area_bottomright[1] && fade_edges_bottom) {
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ratio = 0.0;
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}
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}
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cogl_color_out *= ratio;
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}
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