diff --git a/shaders/dimensions/all_solid.fsh b/shaders/dimensions/all_solid.fsh
index 7d36607..16a98fd 100644
--- a/shaders/dimensions/all_solid.fsh
+++ b/shaders/dimensions/all_solid.fsh
@@ -1,4 +1,3 @@
-#extension GL_EXT_gpu_shader4 : enable
 #extension GL_ARB_shader_texture_lod : enable
 
 #include "/lib/settings.glsl"
@@ -464,11 +463,11 @@ void main() {
 	//////////////////////////////// 				//////////////////////////////// 
 
 	#if defined WORLD && defined MC_NORMAL_MAP
-		vec3 NormalTex = texture2D_POMSwitch(normals, adjustedTexCoord.xy, vec4(dcdx,dcdy), ifPOM).xya;
+		vec3 NormalTex = texture2D_POMSwitch(normals, adjustedTexCoord.xy, vec4(dcdx,dcdy), ifPOM).xyw;
 		float Heightmap = 1.0 - NormalTex.z;
 
-		NormalTex.xy = NormalTex.xy*2.0-1.0;
-		NormalTex.z = clamp(sqrt(1.0 - dot(NormalTex.xy, NormalTex.xy)),0.0,1.0) ;
+		NormalTex.xy = NormalTex.xy * 2.0-1.0;
+		NormalTex.z = sqrt(max(1.0 - dot(NormalTex.xy, NormalTex.xy), 0.0));
 
 		#if defined HEIGTHMAP_DEPTH_OFFSET && !defined HAND
 			gl_FragDepth = gl_FragCoord.z;
diff --git a/shaders/dimensions/all_solid.vsh b/shaders/dimensions/all_solid.vsh
index 640a829..3f05d44 100644
--- a/shaders/dimensions/all_solid.vsh
+++ b/shaders/dimensions/all_solid.vsh
@@ -1,4 +1,4 @@
-#extension GL_EXT_gpu_shader4 : enable
+
 #include "/lib/settings.glsl"
 #include "/lib/res_params.glsl"
 #include "/lib/bokeh.glsl"
diff --git a/shaders/dimensions/composite.vsh b/shaders/dimensions/composite.vsh
index 476633c..b9bebb0 100644
--- a/shaders/dimensions/composite.vsh
+++ b/shaders/dimensions/composite.vsh
@@ -1,6 +1,3 @@
-
-//#extension GL_EXT_gpu_shader4 : disable
-
 #include "/lib/settings.glsl"
 
 flat varying vec2 TAA_Offset;
diff --git a/shaders/dimensions/deferred.vsh b/shaders/dimensions/deferred.vsh
index d90f3f5..66b872c 100644
--- a/shaders/dimensions/deferred.vsh
+++ b/shaders/dimensions/deferred.vsh
@@ -2,7 +2,7 @@
 #include "/lib/res_params.glsl"
 #include "/lib/Shadow_Params.glsl"
 
-// #extension GL_EXT_gpu_shader4 : enable
+
 
 flat varying vec3 averageSkyCol_Clouds;
 flat varying vec3 averageSkyCol;
diff --git a/shaders/dimensions/deferred2.fsh b/shaders/dimensions/deferred2.fsh
index 2c7cbc7..4def756 100644
--- a/shaders/dimensions/deferred2.fsh
+++ b/shaders/dimensions/deferred2.fsh
@@ -1,5 +1,3 @@
-
-//#extension GL_EXT_gpu_shader4 : disable
 #include "/lib/settings.glsl"
 //Computes volumetric clouds at variable resolution (default 1/4 res)
 
diff --git a/shaders/dimensions/deferred2.vsh b/shaders/dimensions/deferred2.vsh
index 87fc6e3..d214d47 100644
--- a/shaders/dimensions/deferred2.vsh
+++ b/shaders/dimensions/deferred2.vsh
@@ -1,5 +1,3 @@
-
-//#extension GL_EXT_gpu_shader4 : disable
 #include "/lib/settings.glsl"
 
 flat varying vec3 averageSkyCol;
diff --git a/shaders/world0/shadow.fsh b/shaders/world0/shadow.fsh
index 6d43fc3..f4b57ef 100644
--- a/shaders/world0/shadow.fsh
+++ b/shaders/world0/shadow.fsh
@@ -1,6 +1,6 @@
 #version 120
 //#extension GL_ARB_shader_texture_lod : disable
-#extension GL_EXT_gpu_shader4 : enable
+
 #include "/lib/settings.glsl"
 
 
@@ -22,7 +22,7 @@ void main() {
 	gl_FragData[0] = texture2D(tex,texcoord.xy);
 	
 	#ifdef SHADOW_DISABLE_ALPHA_MIPMAPS
-		gl_FragData[0].a = texture2DLod(tex,texcoord.xy,0).a;
+		gl_FragData[0].a = texture2DLod(tex,texcoord.xy, 0).a;
 	#endif
 
 	#ifdef RENDER_ENTITY_SHADOWS
diff --git a/shaders/world0/shadow.vsh b/shaders/world0/shadow.vsh
index 0d49ee4..9af489e 100644
--- a/shaders/world0/shadow.vsh
+++ b/shaders/world0/shadow.vsh
@@ -1,5 +1,5 @@
 #version 120
-#extension GL_EXT_gpu_shader4 : enable
+
 
 
 /*