87 lines
2.5 KiB
GLSL
87 lines
2.5 KiB
GLSL
/*
|
|
* This program source code file is part of KICAD, a free EDA CAD application.
|
|
*
|
|
* Copyright (C) 2013-2016 CERN
|
|
* @author Maciej Suminski <maciej.suminski@cern.ch>
|
|
*
|
|
* Fragment shader
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, you may find one here:
|
|
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
|
|
* or you may search the http://www.gnu.org website for the version 2 license,
|
|
* or you may write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
|
|
*/
|
|
|
|
#version 120
|
|
|
|
// Shader types
|
|
const float SHADER_LINE = 1.0;
|
|
const float SHADER_FILLED_CIRCLE = 2.0;
|
|
const float SHADER_STROKED_CIRCLE = 3.0;
|
|
const float SHADER_FONT = 4.0;
|
|
|
|
varying vec4 shaderParams;
|
|
varying vec2 circleCoords;
|
|
uniform sampler2D fontTexture;
|
|
|
|
void filledCircle( vec2 aCoord )
|
|
{
|
|
if( dot( aCoord, aCoord ) < 1.0 )
|
|
gl_FragColor = gl_Color;
|
|
else
|
|
discard;
|
|
}
|
|
|
|
|
|
void strokedCircle( vec2 aCoord, float aRadius, float aWidth )
|
|
{
|
|
float outerRadius = aRadius + ( aWidth / 2 );
|
|
float innerRadius = aRadius - ( aWidth / 2 );
|
|
float relWidth = innerRadius / outerRadius;
|
|
|
|
if( ( dot( aCoord, aCoord ) < 1.0 ) &&
|
|
( dot( aCoord, aCoord ) > relWidth * relWidth ) )
|
|
gl_FragColor = gl_Color;
|
|
else
|
|
discard;
|
|
}
|
|
|
|
|
|
void main()
|
|
{
|
|
if( shaderParams[0] == SHADER_FILLED_CIRCLE )
|
|
{
|
|
filledCircle( circleCoords );
|
|
}
|
|
else if( shaderParams[0] == SHADER_STROKED_CIRCLE )
|
|
{
|
|
strokedCircle( circleCoords, shaderParams[2], shaderParams[3] );
|
|
}
|
|
else if( shaderParams[0] == SHADER_FONT )
|
|
{
|
|
vec4 texel = texture2D( fontTexture, vec2( shaderParams[1], shaderParams[2] ) );
|
|
|
|
if(texel.r < 0.01)
|
|
discard;
|
|
else
|
|
gl_FragColor = vec4(gl_Color.r, gl_Color.g, gl_Color.b, texel.r);
|
|
}
|
|
else
|
|
{
|
|
// Simple pass-through
|
|
gl_FragColor = gl_Color;
|
|
}
|
|
}
|