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/*
* 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 <http://www.gnu.org/licenses/>.
*/
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;
}
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