41 lines
1.6 KiB
GLSL
41 lines
1.6 KiB
GLSL
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/********************************************************************
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KWin - the KDE window manager
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This file is part of the KDE project.
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Copyright (C) 2008 Martin Gräßlin <ubuntu@martin-graesslin.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU 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 float width;
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uniform float height;
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uniform float cubeAngle;
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uniform float xCoord;
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uniform float yCoord;
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void main()
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{
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gl_TexCoord[0].xy = gl_Vertex.xy;
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vec3 vertex = vec3( gl_Vertex.xy - vec2( width*0.5 - xCoord, height*0.5 - yCoord ), gl_Vertex.z );
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float radian = radians(cubeAngle*0.5);
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float radius = (width*0.5)/cos(radian);
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float zenithAngle = acos( vertex.y/radius );
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float azimuthAngle = asin( vertex.x/radius );
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vertex.z = radius * sin( zenithAngle ) * cos( azimuthAngle ) - radius*cos( radians( 90.0 - cubeAngle*0.5 ) );
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vertex.x = radius * sin( zenithAngle ) * sin( azimuthAngle );
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vertex.xy += vec2( width*0.5 - xCoord, height*0.5 - yCoord );
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gl_Position = gl_ModelViewProjectionMatrix * vec4( vertex, 1.0 );
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}
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