72 lines
2.0 KiB
GLSL
72 lines
2.0 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 CERN
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* @author Maciej Suminski <maciej.suminski@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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// Shader types
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const float SHADER_LINE = 1.0;
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const float SHADER_FILLED_CIRCLE = 2.0;
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const float SHADER_STROKED_CIRCLE = 3.0;
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varying vec4 shaderParams;
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void filledCircle( vec2 aCoord )
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{
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if( dot( aCoord, aCoord ) < 1.0 )
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gl_FragColor = gl_Color;
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else
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discard;
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}
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void strokedCircle( vec2 aCoord, float aWidth )
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{
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if( ( dot( aCoord, aCoord ) < 1.0 ) &&
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( dot( aCoord, aCoord ) > aWidth * aWidth ) )
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gl_FragColor = gl_Color;
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else
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discard;
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}
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void main()
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{
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if( shaderParams[0] == SHADER_FILLED_CIRCLE )
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{
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filledCircle( vec2( shaderParams[1], shaderParams[2] ) );
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}
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else if( shaderParams[0] == SHADER_STROKED_CIRCLE )
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{
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strokedCircle( vec2( shaderParams[1], shaderParams[2] ), shaderParams[3] );
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}
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else
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{
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// Simple pass-through
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gl_FragColor = gl_Color;
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}
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}
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