+ /* Middle-raised variation of a_n+1 = a_n * 0.786
+ * Length of LIGHT_MAX+1 means LIGHT_MAX is the last value.
+ * LIGHT_SUN is read as LIGHT_MAX from here.
+ */
+ 8,
+ 11+2,
+ 14+7,
+ 18+10,
+ 22+15,
+ 29+20,
+ 37+20,
+ 47+15,
+ 60+10,
+ 76+7,
+ 97+5,
+ 123+2,
+ 157,
+ 200,
+ 255,
+};
+
+const u8 *light_decode_table = light_LUT;
+
+/** Initialize or update the light value tables using the specified \p gamma.
+ * If \p gamma == 1.0 then the light table is linear. Typically values for
+ * gamma range between 1.8 and 2.2.
+ *
+ * @note The value for gamma will be restricted to the range 1.1 <= gamma <= 3.0.
+ *
+ * @note This function is not, currently, a simple linear to gamma encoding
+ * because adjustments are made so that a gamma of 1.8 gives the same
+ * results as those hardcoded for use by the server.
+ */
+void set_light_table(float gamma)
+{
+ static const float brightness_step = 255.0f / (LIGHT_MAX + 1);
+
+ /* These are adjustment values that are added to the calculated light value
+ * after gamma is applied. Currently they are used so that given a gamma
+ * of 1.8 the light values set by this function are the same as those
+ * hardcoded in the initalizer list for the declaration of light_LUT.
+ */
+ static const int adjustments[LIGHT_MAX + 1] = {
+ 7,
+ 7,
+ 7,
+ 5,
+ 2,
+ 0,
+ -7,
+ -20,
+ -31,
+ -39,
+ -43,
+ -45,
+ -40,
+ -25,
+ 0
+ };
+
+ gamma = rangelim(gamma, 1.1, 3.0);
+
+ float brightness = brightness_step;
+
+ for (size_t i = 0; i < LIGHT_MAX; i++) {
+ light_LUT[i] = (u8)(255 * powf(brightness / 255.0f, gamma));
+ light_LUT[i] = rangelim(light_LUT[i] + adjustments[i], 0, 255);
+ if (i > 1 && light_LUT[i] < light_LUT[i-1])
+ light_LUT[i] = light_LUT[i-1] + 1;
+ brightness += brightness_step;
+ }
+ light_LUT[LIGHT_MAX] = 255;
+}
+#endif
+
+
+
+#if 0
+/*
+Made using this and:
+- adding 220 as the second last one
+- replacing the third last one (212) with 195
+
+#!/usr/bin/python
+
+from math import *
+from sys import stdout
+
+# We want 0 at light=0 and 255 at light=LIGHT_MAX
+LIGHT_MAX = 14
+#FACTOR = 0.69
+#FACTOR = 0.75
+FACTOR = 0.83
+START_FROM_ZERO = False
+
+L = []
+if START_FROM_ZERO:
+ for i in range(1,LIGHT_MAX+1):
+ L.append(int(round(255.0 * FACTOR ** (i-1))))
+ L.append(0)
+else:
+ for i in range(1,LIGHT_MAX+1):
+ L.append(int(round(255.0 * FACTOR ** (i-1))))
+ L.append(255)
+
+L.reverse()
+for i in L:
+ stdout.write(str(i)+",\n")
+*/
+u8 light_decode_table[LIGHT_MAX+1] =
+{
+23,
+27,
+33,
+40,
+48,