-// lighting curve coefficients
- const float a = alpha + beta - 2;
- const float b = 3 - 2 * alpha - beta;
- const float c = alpha;
-// gamma correction
- gamma = rangelim(gamma, 0.5, 3.0);
-
- for (size_t i = 0; i < LIGHT_MAX; i++) {
- float x = i;
- x /= LIGHT_MAX;
- float brightness = a * x * x * x + b * x * x + c * x;
- brightness = powf(brightness, 1.0 / gamma);
- light_LUT[i] = rangelim((u32)(255 * brightness), 0, 255);
+// Lighting curve coefficients
+ params.a = alpha + beta - 2.0f;
+ params.b = 3.0f - 2.0f * alpha - beta;
+ params.c = alpha;
+// Mid boost
+ params.boost = g_settings->getFloat("lighting_boost");
+ params.center = g_settings->getFloat("lighting_boost_center");
+ params.sigma = g_settings->getFloat("lighting_boost_spread");
+// Gamma correction
+ params.gamma = rangelim(gamma, 0.5f, 10.0f);
+
+// Boundary values should be fixed
+ light_LUT[0] = 0;
+ light_LUT[LIGHT_SUN] = 255;
+
+ for (size_t i = 1; i < LIGHT_SUN; i++) {
+ float brightness = decode_light_f((float)i / LIGHT_SUN);
+ // Strictly speaking, rangelim is not necessary here—if the implementation
+ // is conforming. But we don’t want problems in any case.
+ light_LUT[i] = rangelim((s32)(255.0f * brightness), 0, 255);
+ // Ensure light brightens with each level