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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 vfade_offset;
uniform float hfade_offset;
uniform bool fade_edges_top;
uniform bool fade_edges_right;
uniform bool fade_edges_bottom;
uniform bool fade_edges_left;
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;
/*
* We cannot just return here due to a bug in llvmpipe see:
* https://bugzilla.freedesktop.org/show_bug.cgi?id=62357
*/
if (x > fade_area_topleft[0] && x < fade_area_bottomright[0] &&
y > fade_area_topleft[1] && y < fade_area_bottomright[1]) {
float ratio = 1.0;
float fade_bottom_start = fade_area_bottomright[1] - vfade_offset;
float fade_right_start = fade_area_bottomright[0] - hfade_offset;
bool fade_top = y < vfade_offset && fade_edges_top;
bool fade_bottom = y > fade_bottom_start && fade_edges_bottom;
bool fade_left = x < hfade_offset && fade_edges_left;
bool fade_right = x > fade_right_start && fade_edges_right;
float vfade_scale = height / vfade_offset;
if (fade_top) {
ratio *= y / vfade_offset;
}
if (fade_bottom) {
ratio *= (fade_area_bottomright[1] - y) / (fade_area_bottomright[1] - fade_bottom_start);
}
float hfade_scale = width / hfade_offset;
if (fade_left) {
ratio *= x / hfade_offset;
}
if (fade_right) {
ratio *= (fade_area_bottomright[0] - x) / (fade_area_bottomright[0] - fade_right_start);
}
cogl_color_out *= ratio;
}
}
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