diff options
Diffstat (limited to 'src/light.cpp')
| -rw-r--r-- | src/light.cpp | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/src/light.cpp b/src/light.cpp index 575bc2c72..4a20c58ab 100644 --- a/src/light.cpp +++ b/src/light.cpp @@ -24,38 +24,40 @@ with this program; if not, write to the Free Software Foundation, Inc., #ifndef SERVER -// Length of LIGHT_MAX+1 means LIGHT_MAX is the last value. +// Length of LIGHT_MAX + 1 means LIGHT_MAX is the last value. // LIGHT_SUN is read as LIGHT_MAX from here. +u8 light_LUT[LIGHT_MAX + 1]; -u8 light_LUT[LIGHT_MAX+1]; - -// the const ref to light_LUT is what is actually used in the code. +// The const ref to light_LUT is what is actually used in the code const u8 *light_decode_table = light_LUT; -/** Initialize or update the light value tables using the specified \p gamma. - */ +// Initialize or update the light value tables using the specified gamma void set_light_table(float gamma) { -// lighting curve derivatives +// Lighting curve derivatives const float alpha = g_settings->getFloat("lighting_alpha"); const float beta = g_settings->getFloat("lighting_beta"); -// lighting curve coefficients - const float a = alpha + beta - 2; - const float b = 3 - 2 * alpha - beta; +// Lighting curve coefficients + const float a = alpha + beta - 2.0f; + const float b = 3.0f - 2.0f * alpha - beta; const float c = alpha; -// gamma correction - gamma = rangelim(gamma, 0.5, 3.0); +// Mid boost + const float d = g_settings->getFloat("lighting_boost"); + const float e = g_settings->getFloat("lighting_boost_center"); + const float f = g_settings->getFloat("lighting_boost_spread"); +// Gamma correction + gamma = rangelim(gamma, 0.5f, 3.0f); 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); + float boost = d * std::exp(-((x - e) * (x - e)) / (2.0f * f * f)); + brightness = powf(brightness + boost, 1.0f / gamma); + light_LUT[i] = rangelim((u32)(255.0f * brightness), 0, 255); if (i > 1 && light_LUT[i] <= light_LUT[i - 1]) light_LUT[i] = light_LUT[i - 1] + 1; } light_LUT[LIGHT_MAX] = 255; } #endif - |