From 0b875560481ca16782ace98b0bace9f02d18b22d Mon Sep 17 00:00:00 2001
From: paramat <mat.gregory@virginmedia.com>
Date: Mon, 7 Sep 2015 21:48:58 +0200
Subject: [PATCH] Shaders: use triple-frequency waving for leaves and plants

---
 .../shaders/nodes_shader/opengl_vertex.glsl   | 48 +++++++++----------
 1 file changed, 23 insertions(+), 25 deletions(-)

diff --git a/client/shaders/nodes_shader/opengl_vertex.glsl b/client/shaders/nodes_shader/opengl_vertex.glsl
index 53d5c92d0..91536ba10 100644
--- a/client/shaders/nodes_shader/opengl_vertex.glsl
+++ b/client/shaders/nodes_shader/opengl_vertex.glsl
@@ -15,23 +15,30 @@ varying vec3 lightVec;
 varying vec3 tsEyeVec;
 varying vec3 tsLightVec;
 varying float area_enable_parallax;
+varying float disp;
 
 const float e = 2.718281828459;
 const float BS = 10.0;
 
+
 float smoothCurve(float x)
 {
 	return x * x * (3.0 - 2.0 * x);
 }
+
+
 float triangleWave(float x)
 {
 	return abs(fract(x + 0.5) * 2.0 - 1.0);
 }
+
+
 float smoothTriangleWave(float x)
 {
 	return smoothCurve(triangleWave(x)) * 2.0 - 1.0;
 }
 
+
 void main(void)
 {
 	gl_TexCoord[0] = gl_MultiTexCoord0;
@@ -47,48 +54,39 @@ void main(void)
 	area_enable_parallax = 0.0;
 #endif
 
-#if ((MATERIAL_TYPE == TILE_MATERIAL_LIQUID_TRANSPARENT || MATERIAL_TYPE == TILE_MATERIAL_LIQUID_OPAQUE) && ENABLE_WAVING_WATER)
+
+#if (MATERIAL_TYPE == TILE_MATERIAL_WAVING_LEAVES && ENABLE_WAVING_LEAVES) || (MATERIAL_TYPE == TILE_MATERIAL_WAVING_PLANTS && ENABLE_WAVING_PLANTS)
+	vec4 pos2 = mWorld * gl_Vertex;
+	float tOffset = (pos2.x + pos2.y) * 0.001 + pos2.z * 0.002;
+	disp = (smoothTriangleWave(animationTimer * 31.0 + tOffset) +
+		smoothTriangleWave(animationTimer * 29.0 + tOffset) +
+		smoothTriangleWave(animationTimer * 13.0 + tOffset)) - 0.9;
+#endif
+
+
+#if (MATERIAL_TYPE == TILE_MATERIAL_LIQUID_TRANSPARENT || MATERIAL_TYPE == TILE_MATERIAL_LIQUID_OPAQUE) && ENABLE_WAVING_WATER
 	vec4 pos = gl_Vertex;
 	pos.y -= 2.0;
-
 	float posYbuf = (pos.z / WATER_WAVE_LENGTH + animationTimer * WATER_WAVE_SPEED * WATER_WAVE_LENGTH);
-
 	pos.y -= sin(posYbuf) * WATER_WAVE_HEIGHT + sin(posYbuf / 7.0) * WATER_WAVE_HEIGHT;
 	gl_Position = mWorldViewProj * pos;
 #elif MATERIAL_TYPE == TILE_MATERIAL_WAVING_LEAVES && ENABLE_WAVING_LEAVES
 	vec4 pos = gl_Vertex;
-	vec4 pos2 = mWorld * gl_Vertex;
-
-	/*
-	 * Mathematic optimization: pos2.x * A + pos2.z * A (2 multiplications + 1 addition)
-	 * replaced with: (pos2.x + pos2.z) * A (1 addition + 1 multiplication)
-	 * And bufferize calcul to a float
-	 */
-	float pos2XpZ = pos2.x + pos2.z;
-
-	pos.x += (smoothTriangleWave(animationTimer*10.0 + pos2XpZ * 0.01) * 2.0 - 1.0) * 0.4;
-	pos.y += (smoothTriangleWave(animationTimer*15.0 + pos2XpZ * -0.01) * 2.0 - 1.0) * 0.2;
-	pos.z += (smoothTriangleWave(animationTimer*10.0 + pos2XpZ * -0.01) * 2.0 - 1.0) * 0.4;
+	pos.x += disp * 0.1;
+	pos.y += disp * 0.1;
+	pos.z += disp;
 	gl_Position = mWorldViewProj * pos;
 #elif MATERIAL_TYPE == TILE_MATERIAL_WAVING_PLANTS && ENABLE_WAVING_PLANTS
 	vec4 pos = gl_Vertex;
-	vec4 pos2 = mWorld * gl_Vertex;
 	if (gl_TexCoord[0].y < 0.05) {
-		/*
-		 * Mathematic optimization: pos2.x * A + pos2.z * A (2 multiplications + 1 addition)
-		 * replaced with: (pos2.x + pos2.z) * A (1 addition + 1 multiplication)
-		 * And bufferize calcul to a float
-		 */
-		float pos2XpZ = pos2.x + pos2.z;
-
-		pos.x += (smoothTriangleWave(animationTimer * 20.0 + pos2XpZ * 0.1) * 2.0 - 1.0) * 0.8;
-		pos.y -= (smoothTriangleWave(animationTimer * 10.0 + pos2XpZ * -0.5) * 2.0 - 1.0) * 0.4;
+		pos.z += disp;
 	}
 	gl_Position = mWorldViewProj * pos;
 #else
 	gl_Position = mWorldViewProj * gl_Vertex;
 #endif
 
+
 	vPosition = gl_Position.xyz;
 	worldPosition = (mWorld * gl_Vertex).xyz;