Fix the animation speed of leaves which accelerates when the camera i…

…s moving

NEWS.md

@@ -16,6 +16,8 @@ Bugfixes:
 * Fixed the color and the intensity of ambient light being calculated
   incorrectly.
 * Shadows no longer disappear completely when it rains.
+* The animation speed of leaves no longer accelerate when the camera
+  is moving. Water has the same issue but we don't know how to fix it.
 
 ## 1.1.0
 

src/shaders/glsl/renderchunk.vertex

@@ -138,12 +138,16 @@ void main()
 	/* Waves */
 #if !defined(BYPASS_PIXEL_SHADER) && defined(ENABLE_WAVES)
 	if (isLeaf(color)) {
-		POS3 posw = worldPos.xyz;
+		POS3 posw = POSITION.xyz;
 		highp float wave = sin(TIME * 3.5 + 2.0 * posw.x + 2.0 * posw.z + posw.y);
 		gl_Position.x += wave * 0.015;
 	}
 	else if (isWater(color)) {
-		POS3 posw = worldPos.xyz;
+		/* THINKME: In theory this should be the position of the
+		 * vertex in the world coordinates without getting affected by
+		 * the view position, but actually it's not working as
+		 * expected. I don't know why. */
+		POS3 posw = worldPos.xyz + VIEW_POS;
 
 		/* We want water to swell in proportion to its volume. The more
 		 * the vertex is close to the ground (i.e. integral points in the