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-rw-r--r--builtin/settingtypes.txt14
-rw-r--r--src/defaultsettings.cpp5
-rw-r--r--src/light.cpp32
3 files changed, 34 insertions, 17 deletions
diff --git a/builtin/settingtypes.txt b/builtin/settingtypes.txt
index 74c71a1ec..994b49ed2 100644
--- a/builtin/settingtypes.txt
+++ b/builtin/settingtypes.txt
@@ -574,9 +574,21 @@ zoom_fov (Field of view for zoom) int 15 7 160
# This setting is for the client only and is ignored by the server.
display_gamma (Gamma) float 1.0 0.5 3.0
+# Gradient of light curve at minimum light level.
lighting_alpha (Darkness sharpness) float 0.0 0.0 4.0
-lighting_beta (Lightness sharpness) float 0.0 0.0 4.0
+# Gradient of light curve at maximum light level.
+lighting_beta (Lightness sharpness) float 1.5 0.0 4.0
+
+# Strength of light curve mid-boost.
+lighting_boost (Light curve mid boost) float 0.2 0.0 1.0
+
+# Center of light curve mid-boost.
+lighting_boost_center (Light curve mid boost center) float 0.5 0.0 1.0
+
+# Spread of light curve mid-boost.
+# Standard deviation of the mid-boost gaussian.
+lighting_boost_spread (Light curve mid boost spread) float 0.2 0.0 1.0
# Path to texture directory. All textures are first searched from here.
texture_path (Texture path) path
diff --git a/src/defaultsettings.cpp b/src/defaultsettings.cpp
index 1a2656f0e..41f018b78 100644
--- a/src/defaultsettings.cpp
+++ b/src/defaultsettings.cpp
@@ -163,8 +163,11 @@ void set_default_settings(Settings *settings)
settings->setDefault("connected_glass", "false");
settings->setDefault("smooth_lighting", "true");
settings->setDefault("lighting_alpha", "0.0");
- settings->setDefault("lighting_beta", "0.0");
+ settings->setDefault("lighting_beta", "1.5");
settings->setDefault("display_gamma", "1.0");
+ settings->setDefault("lighting_boost", "0.2");
+ settings->setDefault("lighting_boost_center", "0.5");
+ settings->setDefault("lighting_boost_spread", "0.2");
settings->setDefault("texture_path", "");
settings->setDefault("shader_path", "");
settings->setDefault("video_driver", "opengl");
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
-