42 lines
1.4 KiB
GLSL
42 lines
1.4 KiB
GLSL
/*
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* This program source code file is part of KICAD, a free EDA CAD application.
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*
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* Copyright (C) 2013 Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
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*
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* Fragment shader
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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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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*
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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, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#version 120
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varying float aspect;
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void main()
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{
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vec2 v = abs( gl_TexCoord[0].xy - vec2( 0.5, 0.5 ) ) * 2.0 - vec2( aspect, 0.0 );
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vec2 d = vec2( v.x / ( 1.0 - aspect ), v.y );
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if( v.x <= 0.0 || (dot( d, d ) < 1.0 ) )
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gl_FragColor = gl_Color;
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else
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discard;
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// gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);
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}
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