fixed glsl 1.0 version of the postShadowFilter shader

jme3-core/src/main/resources/Common/MatDefs/Shadow/PostShadowFilter.frag

@@ -40,7 +40,7 @@ vec3 getPosition(in float depth, in vec2 uv){
     pos = m_ViewProjectionMatrixInverse * pos;
     return pos.xyz / pos.w;
 }
-
+#ifndef BACKFACE_SHADOWS
     vec3 approximateNormal(in vec4 worldPos,in vec2 texCoord){
         float step = g_ResolutionInverse.x ;
         float stepy = g_ResolutionInverse.y ;
@@ -53,13 +53,9 @@ vec3 approximateNormal(in vec4 worldPos,in vec2 texCoord){
         vec3 v2 = (worldPos3 - worldPos2).xyz;
         return normalize(cross(v1, v2));
     }
-
-void main(){    
-    #if !defined( RENDER_SHADOWS )
-          gl_FragColor = texture2D(m_Texture,texCoord);
-          return;
 #endif
 
+void main(){
     float depth = texture2D(m_DepthTexture,texCoord).r;
     vec4 color = texture2D(m_Texture,texCoord);
 
@@ -72,7 +68,6 @@ void main(){
 
     // get the vertex in world space
     vec4 worldPos = vec4(getPosition(depth,texCoord),1.0);
-    vec3 normal = approximateNormal(worldPos, texCoord);
 
     vec3 lightDir;
     #ifdef PSSM
@@ -80,14 +75,17 @@ void main(){
     #else
         lightDir = worldPos.xyz - m_LightPos;
     #endif
+
+    #ifndef BACKFACE_SHADOWS
+        vec3 normal = approximateNormal(worldPos, texCoord);
         float ndotl = dot(normal, lightDir);
         if(ndotl > -0.0){
             gl_FragColor = color;
             return;
         }
+    #endif
    
      #if (!defined(POINTLIGHT) && !defined(PSSM))
-          vec3 lightDir = worldPos.xyz - m_LightPos;
           if( dot(m_LightDir,lightDir) < 0.0){
             gl_FragColor = color;
             return;

jme3-core/src/main/resources/Common/MatDefs/Shadow/PostShadowFilter.j3md

@@ -59,8 +59,6 @@ MaterialDef Post Shadow {
             FADE : FadeInfo
             PSSM : Splits
             POINTLIGHT : LightViewProjectionMatrix5
-            //if no shadow map don't render shadows
-            RENDER_SHADOWS : ShadowMap0
             BACKFACE_SHADOWS : BackfaceShadows
         }