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23 lines
798 B
23 lines
798 B
1 year ago
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#if IS_AR
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float3 color_correct(float3 rgb) {
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float3 corrected = rgb.x * (float3)(1.82717181, -0.31231438, 0.07307673);
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corrected += rgb.y * (float3)(-0.5743977, 1.36858544, -0.53183455);
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corrected += rgb.z * (float3)(-0.25277411, -0.05627105, 1.45875782);
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return corrected;
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}
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float3 apply_gamma(float3 rgb, int expo_time) {
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// tone mapping params
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const float gamma_k = 0.75;
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const float gamma_b = 0.125;
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const float mp = 0.01; // ideally midpoint should be adaptive
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const float rk = 9 - 100*mp;
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// poly approximation for s curve
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return (rgb > mp) ?
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((rk * (rgb-mp) * (1-(gamma_k*mp+gamma_b)) * (1+1/(rk*(1-mp))) / (1+rk*(rgb-mp))) + gamma_k*mp + gamma_b) :
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((rk * (rgb-mp) * (gamma_k*mp+gamma_b) * (1+1/(rk*mp)) / (1-rk*(rgb-mp))) + gamma_k*mp + gamma_b);
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}
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#endif
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