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#ifndef BLEND_COLOR_LAYERS_GLSLLIB
#define BLEND_COLOR_LAYERS_GLSLLIB
float maxValue( in vec3 t )
{
return max( max( t.x, t.y ), t.z );
}
vec3 blendColor( in vec3 t, in vec3 b, in float weight, in int blendMode)
{
vec3 blendResult = t;
switch( blendMode )
{
case color_layer_add :
blendResult += b;
break;
case color_layer_multiply :
blendResult *= b;
break;
case color_layer_screen :
blendResult += t - t * b;
break;
case color_layer_overlay:
blendResult = (maxValue(t) >= 0.5) ? 2.0 * (t+b - t*b - 0.5) : 2.0 * t*b;
break;
case color_layer_blend:
default:
// nothing to be done
break;
}
return mix( b, blendResult, weight );
}
texture_return blendColorLayers( in color_layer colorLayer[1], in vec3 base, in int monoSource )
{
vec3 result = blendColor( colorLayer[0].layer_color, base, colorLayer[0].weight, colorLayer[0].mode );
texture_return tr;
tr.tint = result;
tr.mono = monoChannel( vec4( result, 1.0 ), monoSource );
return( tr );
}
#endif
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