From 60bff1e6cbf56e9a248bc4b0928dfc716cf04131 Mon Sep 17 00:00:00 2001
From: Lars Hofhansl <larsh@apache.org>
Date: Tue, 19 Nov 2019 19:42:52 -0800
Subject: Waves generated with Perlin-type noise #8994

---
 src/client/mapblock_mesh.cpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/client/mapblock_mesh.cpp b/src/client/mapblock_mesh.cpp
index 2bfaa7a4f..a5bee6b88 100644
--- a/src/client/mapblock_mesh.cpp
+++ b/src/client/mapblock_mesh.cpp
@@ -795,6 +795,7 @@ static void getTileInfo(
 		v3s16 &p_corrected,
 		v3s16 &face_dir_corrected,
 		u16 *lights,
+		u8 &waving,
 		TileSpec &tile
 	)
 {
@@ -842,6 +843,7 @@ static void getTileInfo(
 
 	getNodeTile(n, p_corrected, face_dir_corrected, data, tile);
 	const ContentFeatures &f = ndef->get(n);
+	waving = f.waving;
 	tile.emissive_light = f.light_source;
 
 	// eg. water and glass
@@ -876,6 +878,10 @@ static void updateFastFaceRow(
 		const v3s16 &&face_dir,
 		std::vector<FastFace> &dest)
 {
+	static thread_local const bool waving_liquids =
+		g_settings->getBool("enable_shaders") &&
+		g_settings->getBool("enable_waving_water");
+
 	v3s16 p = startpos;
 
 	u16 continuous_tiles_count = 1;
@@ -884,10 +890,11 @@ static void updateFastFaceRow(
 	v3s16 p_corrected;
 	v3s16 face_dir_corrected;
 	u16 lights[4] = {0, 0, 0, 0};
+	u8 waving;
 	TileSpec tile;
 	getTileInfo(data, p, face_dir,
 			makes_face, p_corrected, face_dir_corrected,
-			lights, tile);
+			lights, waving, tile);
 
 	// Unroll this variable which has a significant build cost
 	TileSpec next_tile;
@@ -910,12 +917,15 @@ static void updateFastFaceRow(
 			getTileInfo(data, p_next, face_dir,
 					next_makes_face, next_p_corrected,
 					next_face_dir_corrected, next_lights,
+					waving,
 					next_tile);
 
 			if (next_makes_face == makes_face
 					&& next_p_corrected == p_corrected + translate_dir
 					&& next_face_dir_corrected == face_dir_corrected
 					&& memcmp(next_lights, lights, ARRLEN(lights) * sizeof(u16)) == 0
+					// Don't apply fast faces to waving water.
+					&& (waving != 3 || !waving_liquids)
 					&& next_tile.isTileable(tile)) {
 				next_is_different = false;
 				continuous_tiles_count++;
-- 
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