From 53efe2ef4272c4ea8c347059e096f1ebd210d9a2 Mon Sep 17 00:00:00 2001
From: RealBadAngel <maciej.kasatkin@o2.pl>
Date: Sun, 21 Jun 2015 00:11:09 +0200
Subject: [PATCH] Remove textures vertical offset. Fix for area enabling
 parallax.

---
 .../shaders/nodes_shader/opengl_fragment.glsl |  8 ++++----
 .../shaders/nodes_shader/opengl_vertex.glsl   | 20 +++++++++++--------
 2 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/client/shaders/nodes_shader/opengl_fragment.glsl b/client/shaders/nodes_shader/opengl_fragment.glsl
index 066e49658..0e84eacf9 100644
--- a/client/shaders/nodes_shader/opengl_fragment.glsl
+++ b/client/shaders/nodes_shader/opengl_fragment.glsl
@@ -8,7 +8,7 @@ uniform vec3 eyePosition;
 
 varying vec3 vPosition;
 varying vec3 worldPosition;
-varying float generate_heightmaps;
+varying float area_enable_parallax;
 
 varying vec3 eyeVec;
 varying vec3 tsEyeVec;
@@ -95,7 +95,7 @@ void main (void)
 	vec3 eyeRay = normalize(tsEyeVec);
 #if PARALLAX_OCCLUSION_MODE == 0
 	// Parallax occlusion with slope information
-	if (normalTexturePresent) {
+	if (normalTexturePresent && area_enable_parallax > 0.0) {
 		const float scale = PARALLAX_OCCLUSION_SCALE / PARALLAX_OCCLUSION_ITERATIONS;
 		const float bias = PARALLAX_OCCLUSION_BIAS / PARALLAX_OCCLUSION_ITERATIONS;
 		for(int i = 0; i < PARALLAX_OCCLUSION_ITERATIONS; i++) {
@@ -106,12 +106,12 @@ void main (void)
 #endif
 #if PARALLAX_OCCLUSION_MODE == 1
 	// Relief mapping
-	if (normalTexturePresent) {
+	if (normalTexturePresent && area_enable_parallax > 0.0) {
 		vec2 ds = eyeRay.xy * PARALLAX_OCCLUSION_SCALE;
 		float dist = find_intersection(uv, ds);
 		uv += dist * ds;
 #endif
-	} else if (generate_heightmaps > 0.0) {
+	} else if (area_enable_parallax > 0.0) {
 		vec2 ds = eyeRay.xy * PARALLAX_OCCLUSION_SCALE;
 		float dist = find_intersectionRGB(uv, ds);
 		uv += dist * ds;
diff --git a/client/shaders/nodes_shader/opengl_vertex.glsl b/client/shaders/nodes_shader/opengl_vertex.glsl
index 42a5f6cbf..5c4d46be6 100644
--- a/client/shaders/nodes_shader/opengl_vertex.glsl
+++ b/client/shaders/nodes_shader/opengl_vertex.glsl
@@ -14,7 +14,7 @@ varying vec3 eyeVec;
 varying vec3 lightVec;
 varying vec3 tsEyeVec;
 varying vec3 tsLightVec;
-varying float generate_heightmaps;
+varying float area_enable_parallax;
 
 const float e = 2.718281828459;
 const float BS = 10.0;
@@ -35,12 +35,16 @@ float smoothTriangleWave(float x)
 void main(void)
 {
 	gl_TexCoord[0] = gl_MultiTexCoord0;
-	gl_TexCoord[0].y += 0.008;
-
+	//TODO: make offset depending on view angle and parallax uv displacement
+	//thats for textures that doesnt align vertically, like dirt with grass
+	//gl_TexCoord[0].y += 0.008;
+
+	//Allow parallax/relief mapping only for certain kind of nodes
+	//Variable is also used to control area of the effect
 #if ((DRAW_TYPE == NDT_NORMAL || DRAW_TYPE == NDT_LIQUID || DRAW_TYPE == NDT_FLOWINGLIQUID) && GENERATE_NORMALMAPS)
-	generate_heightmaps = 1.0;
+	area_enable_parallax = 1.0;
 #else
-	generate_heightmaps = 0.0;
+	area_enable_parallax = 0.0;
 #endif
 
 #if ((MATERIAL_TYPE == TILE_MATERIAL_LIQUID_TRANSPARENT || MATERIAL_TYPE == TILE_MATERIAL_LIQUID_OPAQUE) && ENABLE_WAVING_WATER)
@@ -89,9 +93,9 @@ void main(void)
 	worldPosition = (mWorld * gl_Vertex).xyz;
 
 	// Don't generate heightmaps when too far from the eye
-	float dist = distance (worldPosition, eyePosition);
-	if (dist > 100.00) {
-		generate_heightmaps = 0.0;
+	float dist = distance (vec3(0.0, 0.0 ,0.0), vPosition);
+	if (dist > 100.0) {
+		area_enable_parallax = 0.0;
 	}
 
 	vec3 sunPosition = vec3 (0.0, eyePosition.y * BS + 900.0, 0.0);