From 00ca23c2b8ac3f26c34a17cd8db7cf9315492b3d Mon Sep 17 00:00:00 2001
From: Bixilon <bixilon@bixilon.de>
Date: Wed, 2 Nov 2022 14:12:12 +0100
Subject: [PATCH] sky: calculate day and night time

---
 .../data/text/formatting/color/RGBColor.kt    |  2 ++
 .../minosoft/data/world/time/MoonPhases.kt    | 18 ++++++++---------
 .../minosoft/data/world/time/WorldTime.kt     |  2 +-
 .../gui/rendering/sky/box/SkyboxRenderer.kt   | 20 +++++++++++++++----
 4 files changed, 28 insertions(+), 14 deletions(-)

diff --git a/src/main/java/de/bixilon/minosoft/data/text/formatting/color/RGBColor.kt b/src/main/java/de/bixilon/minosoft/data/text/formatting/color/RGBColor.kt
index a57531473..6bad6bc4b 100644
--- a/src/main/java/de/bixilon/minosoft/data/text/formatting/color/RGBColor.kt
+++ b/src/main/java/de/bixilon/minosoft/data/text/formatting/color/RGBColor.kt
@@ -33,6 +33,8 @@ class RGBColor(val rgba: Int) : ChatCode, TextFormattable {
 
     constructor(red: Double, green: Double, blue: Double, alpha: Double = 1.0) : this(red.toFloat(), green.toFloat(), blue.toFloat(), alpha.toFloat())
 
+    constructor(vec3: Vec3) : this(vec3.r, vec3.g, vec3.b)
+
     val argb: Int
         get() = (alpha shl 24) or (red shl 16) or (green shl 8) or blue
 
diff --git a/src/main/java/de/bixilon/minosoft/data/world/time/MoonPhases.kt b/src/main/java/de/bixilon/minosoft/data/world/time/MoonPhases.kt
index 62ebdfd22..3d6860962 100644
--- a/src/main/java/de/bixilon/minosoft/data/world/time/MoonPhases.kt
+++ b/src/main/java/de/bixilon/minosoft/data/world/time/MoonPhases.kt
@@ -17,15 +17,15 @@ import de.bixilon.kutil.enums.EnumUtil
 import de.bixilon.kutil.enums.ValuesEnum
 
 // see https://minecraft.fandom.com/wiki/Moon
-enum class MoonPhases {
-    FULL_MOON,
-    WANING_GIBBOUS,
-    LAST_QUARTER,
-    WANING_CRESCENT,
-    NEW_MOON,
-    WAXING_CRESCENT,
-    FIRST_QUARTER,
-    WAXING_GIBBOUS,
+enum class MoonPhases(val light: Float) {
+    FULL_MOON(1.0f),
+    WANING_GIBBOUS(0.7f),
+    LAST_QUARTER(0.4f),
+    WANING_CRESCENT(0.2f),
+    NEW_MOON(0.0f),
+    WAXING_CRESCENT(0.2f),
+    FIRST_QUARTER(0.4f),
+    WAXING_GIBBOUS(0.7f),
     ;
 
     companion object : ValuesEnum<MoonPhases> {
diff --git a/src/main/java/de/bixilon/minosoft/data/world/time/WorldTime.kt b/src/main/java/de/bixilon/minosoft/data/world/time/WorldTime.kt
index 8765dca8c..6a04b6558 100644
--- a/src/main/java/de/bixilon/minosoft/data/world/time/WorldTime.kt
+++ b/src/main/java/de/bixilon/minosoft/data/world/time/WorldTime.kt
@@ -29,7 +29,7 @@ class WorldTime(
     val time = abs(time) % ProtocolDefinition.TICKS_PER_DAY
     val cycling = time >= 0
 
-    val moonPhase = MoonPhases[age.toInt() % ProtocolDefinition.TICKS_PER_DAY % MoonPhases.VALUES.size] // ToDo: Verify
+    val moonPhase = MoonPhases[age.toInt() / ProtocolDefinition.TICKS_PER_DAY % MoonPhases.VALUES.size] // ToDo: Verify
     val phase = DayPhases.of(time)
 
 
diff --git a/src/main/java/de/bixilon/minosoft/gui/rendering/sky/box/SkyboxRenderer.kt b/src/main/java/de/bixilon/minosoft/gui/rendering/sky/box/SkyboxRenderer.kt
index 01872eb4d..964de1f7a 100644
--- a/src/main/java/de/bixilon/minosoft/gui/rendering/sky/box/SkyboxRenderer.kt
+++ b/src/main/java/de/bixilon/minosoft/gui/rendering/sky/box/SkyboxRenderer.kt
@@ -14,6 +14,7 @@
 package de.bixilon.minosoft.gui.rendering.sky.box
 
 import de.bixilon.kotlinglm.vec2.Vec2i
+import de.bixilon.kotlinglm.vec3.Vec3
 import de.bixilon.kutil.watcher.DataWatcher.Companion.observe
 import de.bixilon.kutil.watcher.DataWatcher.Companion.watched
 import de.bixilon.minosoft.data.registries.biomes.Biome
@@ -29,7 +30,11 @@ import de.bixilon.minosoft.gui.rendering.sky.properties.DefaultSkyProperties
 import de.bixilon.minosoft.gui.rendering.sky.properties.SkyProperties
 import de.bixilon.minosoft.gui.rendering.system.base.texture.texture.AbstractTexture
 import de.bixilon.minosoft.gui.rendering.util.vec.vec3.Vec3Util.blockPosition
+import de.bixilon.minosoft.gui.rendering.util.vec.vec3.Vec3Util.interpolateLinear
+import de.bixilon.minosoft.gui.rendering.util.vec.vec3.Vec3Util.interpolateSine
 import de.bixilon.minosoft.util.KUtil.minosoft
+import kotlin.math.abs
+import kotlin.math.pow
 
 class SkyboxRenderer(
     private val sky: SkyRenderer,
@@ -136,16 +141,23 @@ class SkyboxRenderer(
         return ChatColors.YELLOW
     }
 
-    private fun calculateDaytime(progress: Float): RGBColor {
-        return ChatColors.BLUE
+    private fun calculateDaytime(progress: Float): RGBColor? {
+        val base = calculateBiomeAvg { it.skyColor }?.toVec3() ?: return null
+
+        return RGBColor(interpolateLinear((abs(progress - 0.5f) * 2.0f).pow(2), base, base * 0.9f))
     }
 
     private fun calculateSunset(progress: Float): RGBColor {
         return ChatColors.RED
     }
 
-    private fun calculateNight(progress: Float): RGBColor {
-        return ChatColors.DARK_BLUE
+    private fun calculateNight(progress: Float): RGBColor? {
+        val base = calculateBiomeAvg { it.skyColor }?.toVec3() ?: return null
+        base *= 0.2
+
+        val minColor = Vec3(0.02f, 0.04f, 0.09f) * time.moonPhase.light
+
+        return RGBColor(interpolateSine(abs(progress - 0.5f) * 2.0f, minColor, base))
     }
 
     private fun calculateSkyColor(): RGBColor? {