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17 lines
893 B
GLSL
17 lines
893 B
GLSL
// the skydome vertex colours carry Perez luminance scaled by a fixed exposure
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// (see CSkyDome::SetExposure), so the circumsolar region and the horizon band
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// routinely land well above 1.0. hard-clipping them, as this shader used to do,
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// flattened everything within ~20 degrees of the sun - and most of the lower sky -
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// into one solid white patch. compress the top end instead: below the knee the
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// response is unchanged, above it it rolls off towards SKY_SHOULDER_WHITE, so the
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// brightness gradient around the sun survives and the patch keeps a soft edge.
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const float SKY_SHOULDER_KNEE = 0.25;
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const float SKY_SHOULDER_WHITE = 0.95;
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vec3 sky_shoulder(vec3 color)
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{
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const float range = SKY_SHOULDER_WHITE - SKY_SHOULDER_KNEE;
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vec3 excess = max(color - vec3(SKY_SHOULDER_KNEE), vec3(0.0));
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return min(color, vec3(SKY_SHOULDER_KNEE)) + range * (vec3(1.0) - exp(-excess / range));
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}
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