qskinny/src/nodes/shaders/gradientlinear.frag

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uniform sampler2D palette;
uniform highp float opacity;
varying highp float colorIndex;
lowp vec4 colorAt( float value )
{
return texture2D( palette, vec2( value, 0.0 ) );
}
void main()
{
gl_FragColor = colorAt( colorIndex ) * opacity;
}