Calculate viewNormal only when needed

files/shaders/objects_fragment.glsl

@@ -83,7 +83,9 @@ void main()
     mat3 tbnTranspose = mat3(normalizedTangent, binormal, normalizedNormal);
 
     vec3 viewNormal = gl_NormalMatrix * normalize(tbnTranspose * (normalTex.xyz * 2.0 - 1.0));
-#else
+#endif
+
+#if (!@normalMap && (@parallax || @forcePPL))
     vec3 viewNormal = gl_NormalMatrix * normalize(passNormal);
 #endif
 
@@ -184,7 +186,12 @@ void main()
 #endif
 
     if (matSpec != vec3(0.0))
+    {
+#if (!normalMap && !@parallax && !forcePPL)
+        vec3 viewNormal = gl_NormalMatrix * normalize(passNormal);
+#endif
         gl_FragData[0].xyz += getSpecular(normalize(viewNormal), normalize(passViewPos.xyz), shininess, matSpec) * shadowing;
+    }
 #if @radialFog
     float depth;
     // For the less detailed mesh of simple water we need to recalculate depth on per-pixel basis

files/shaders/objects_vertex.glsl

@@ -63,7 +63,9 @@ void main(void)
     euclideanDepth = length(viewPos.xyz);
     linearDepth = gl_Position.z;
 
+#if (@envMap || !PER_PIXEL_LIGHTING || @shadows_enabled)
     vec3 viewNormal = normalize((gl_NormalMatrix * gl_Normal).xyz);
+#endif
 
 #if @envMap
     vec3 viewVec = normalize(viewPos.xyz);
@@ -112,5 +114,7 @@ void main(void)
     passViewPos = viewPos.xyz;
     passNormal = gl_Normal.xyz;
 
+#if (@shadows_enabled)
     setupShadowCoords(viewPos, viewNormal);
+#endif
 }

files/shaders/terrain_fragment.glsl

@@ -43,8 +43,10 @@ void main()
     mat3 tbnTranspose = mat3(tangent, binormal, normalizedNormal);
 
     vec3 viewNormal = normalize(gl_NormalMatrix * (tbnTranspose * (normalTex.xyz * 2.0 - 1.0)));
-#else
-    vec3 viewNormal = normalize(gl_NormalMatrix * passNormal);
+#endif
+
+#if (!@normalMap && (@parallax || @forcePPL))
+    vec3 viewNormal = gl_NormalMatrix * normalize(passNormal);
 #endif
 
 #if @parallax
@@ -93,7 +95,12 @@ void main()
 #endif
 
     if (matSpec != vec3(0.0))
+    {
+#if (!normalMap && !@parallax && !forcePPL)
+        vec3 viewNormal = gl_NormalMatrix * normalize(passNormal);
+#endif
         gl_FragData[0].xyz += getSpecular(normalize(viewNormal), normalize(passViewPos), shininess, matSpec) * shadowing;
+    }
 
 #if @radialFog
     float fogValue = clamp((euclideanDepth - gl_Fog.start) * gl_Fog.scale, 0.0, 1.0);

files/shaders/terrain_vertex.glsl

@@ -26,8 +26,10 @@ void main(void)
     gl_ClipVertex = viewPos;
     euclideanDepth = length(viewPos.xyz);
     linearDepth = gl_Position.z;
-    
+
+#if (!PER_PIXEL_LIGHTING || @shadows_enabled)
     vec3 viewNormal = normalize((gl_NormalMatrix * gl_Normal).xyz);
+#endif
 
 #if !PER_PIXEL_LIGHTING
     lighting = doLighting(viewPos.xyz, viewNormal, gl_Color, shadowDiffuseLighting);
@@ -38,5 +40,7 @@ void main(void)
 
     uv = gl_MultiTexCoord0.xy;
 
+#if (@shadows_enabled)
     setupShadowCoords(viewPos, viewNormal);
+#endif
 }