From 0358ae789a6aa5c161c3b9017651b7d2c2f28fd8 Mon Sep 17 00:00:00 2001
From: Vitaliy <silverunicorn2011@yandex.ru>
Date: Sat, 17 Mar 2018 12:10:16 +0300
Subject: Fix node-nodebox lighting difference in direct sunlight (#7061)

---
 src/content_mapblock.h | 37 ++++++++++++++++++++++++++-----------
 1 file changed, 26 insertions(+), 11 deletions(-)

(limited to 'src/content_mapblock.h')

diff --git a/src/content_mapblock.h b/src/content_mapblock.h
index 7b90ce4b9..97947cdbe 100644
--- a/src/content_mapblock.h
+++ b/src/content_mapblock.h
@@ -26,21 +26,36 @@ struct MeshMakeData;
 struct MeshCollector;
 
 struct LightPair {
-	u8 lightA;
-	u8 lightB;
+	u8 lightDay;
+	u8 lightNight;
 
 	LightPair() = default;
-	explicit LightPair(u16 value) : lightA(value & 0xff), lightB(value >> 8) {}
-	LightPair(u8 valueA, u8 valueB) : lightA(valueA), lightB(valueB) {}
+	explicit LightPair(u16 value) : lightDay(value & 0xff), lightNight(value >> 8) {}
+	LightPair(u8 valueA, u8 valueB) : lightDay(valueA), lightNight(valueB) {}
 	LightPair(float valueA, float valueB) :
-		lightA(core::clamp(core::round32(valueA), 0, 255)),
-		lightB(core::clamp(core::round32(valueB), 0, 255)) {}
-	operator u16() const { return lightA | lightB << 8; }
+		lightDay(core::clamp(core::round32(valueA), 0, 255)),
+		lightNight(core::clamp(core::round32(valueB), 0, 255)) {}
+	operator u16() const { return lightDay | lightNight << 8; }
+};
+
+struct LightInfo {
+	float light_day;
+	float light_night;
+	float light_boosted;
+
+	LightPair getPair(float sunlight_boost = 0.0) const
+	{
+		return LightPair(
+			(1 - sunlight_boost) * light_day
+			+ sunlight_boost * light_boosted,
+			light_night);
+	}
 };
 
 struct LightFrame {
-	f32 lightsA[8];
-	f32 lightsB[8];
+	f32 lightsDay[8];
+	f32 lightsNight[8];
+	bool sunlight[8];
 };
 
 class MapblockMeshGenerator
@@ -69,7 +84,7 @@ public:
 
 // lighting
 	void getSmoothLightFrame();
-	LightPair blendLight(const v3f &vertex_pos);
+	LightInfo blendLight(const v3f &vertex_pos);
 	video::SColor blendLightColor(const v3f &vertex_pos);
 	video::SColor blendLightColor(const v3f &vertex_pos, const v3f &vertex_normal);
 
@@ -85,7 +100,7 @@ public:
 
 // cuboid drawing!
 	void drawCuboid(const aabb3f &box, TileSpec *tiles, int tilecount,
-		const LightPair *lights , const f32 *txc);
+		const LightInfo *lights , const f32 *txc);
 	void generateCuboidTextureCoords(aabb3f const &box, f32 *coords);
 	void drawAutoLightedCuboid(aabb3f box, const f32 *txc = NULL,
 		TileSpec *tiles = NULL, int tile_count = 0);
-- 
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