c23786c73e
Commit 4095a58eb9 introduced a
regression, since we have to take into account four cases,
top, bottom, right, and left, and that can't be merged into
two like that commit did.
So fix it to make fade effect works again.
https://bugzilla.gnome.org/show_bug.cgi?id=708256
75 lines
2.5 KiB
GLSL
75 lines
2.5 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_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 < hfade_offset && 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 *= y / vfade_offset;
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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 *= x / hfade_offset;
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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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