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Drop lightness threshold for color effect

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HSL's lightness is, in this case, basically the same as half of HSV's
value, so this change halves the threshold value used by the color
effect to make it similar in appearance to the HSV implementation.
This commit is contained in:
Christopher Willis-Ford
2016-06-01 14:23:13 -07:00
parent f6b78b2216
commit e03e9a0929
1 changed files with 4 additions and 2 deletions
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6
src/shaders/sprite.frag
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@@ -153,8 +153,10 @@ void main()
{
// this code forces grayscale values to be slightly saturated
// so that some slight change of hue will be visible
if (hsl.z < 0.11) hsl = vec3(0.0, 1.0, 0.11); // force black to dark gray, fully-saturated
else if (hsl.y < 0.09) hsl = vec3(0.0, 0.09, hsl.z); // make saturation at least 0.09
const float minLightness = 0.11 / 2.0;
const float minSaturation = 0.09;
if (hsl.z < minLightness) hsl = vec3(0.0, 1.0, minLightness);
else if (hsl.y < minSaturation) hsl = vec3(0.0, minSaturation, hsl.z);
hsl.x = mod(hsl.x + u_color, 1.0);
if (hsl.x < 0.0) hsl.x += 1.0;