From 662a0151e208ddb632e9aef2cb69cfa135f006d5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Re=CC=81my=20Bouquet?= <rebouquet@airfrance.fr>
Date: Fri, 12 Aug 2016 20:51:56 +0200
Subject: [PATCH] fixed glsl 1.0 version of the postShadowFilter shader

---
 .../MatDefs/Shadow/PostShadowFilter.frag      | 50 +++++++++----------
 .../MatDefs/Shadow/PostShadowFilter.j3md      |  2 -
 2 files changed, 24 insertions(+), 28 deletions(-)

diff --git a/jme3-core/src/main/resources/Common/MatDefs/Shadow/PostShadowFilter.frag b/jme3-core/src/main/resources/Common/MatDefs/Shadow/PostShadowFilter.frag
index b144dca60..3e7cc8eae 100644
--- a/jme3-core/src/main/resources/Common/MatDefs/Shadow/PostShadowFilter.frag
+++ b/jme3-core/src/main/resources/Common/MatDefs/Shadow/PostShadowFilter.frag
@@ -40,26 +40,22 @@ 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 ;
+        float depth2 = texture2D(m_DepthTexture,texCoord + vec2(step,-stepy)).r;
+        float depth3 = texture2D(m_DepthTexture,texCoord + vec2(-step,-stepy)).r;
+        vec4 worldPos2 = vec4(getPosition(depth2,texCoord + vec2(step,-stepy)),1.0);
+        vec4 worldPos3 = vec4(getPosition(depth3,texCoord + vec2(-step,-stepy)),1.0);
+
+        vec3 v1 = (worldPos - worldPos2).xyz;
+        vec3 v2 = (worldPos3 - worldPos2).xyz;
+        return normalize(cross(v1, v2));
+    }
+#endif
 
-vec3 approximateNormal(in vec4 worldPos,in vec2 texCoord){
-    float step = g_ResolutionInverse.x ;
-    float stepy = g_ResolutionInverse.y ;
-    float depth2 = texture2D(m_DepthTexture,texCoord + vec2(step,-stepy)).r;
-    float depth3 = texture2D(m_DepthTexture,texCoord + vec2(-step,-stepy)).r;
-    vec4 worldPos2 = vec4(getPosition(depth2,texCoord + vec2(step,-stepy)),1.0);
-    vec4 worldPos3 = vec4(getPosition(depth3,texCoord + vec2(-step,-stepy)),1.0);
-
-    vec3 v1 = (worldPos - worldPos2).xyz;
-    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
-    float ndotl = dot(normal, lightDir);
-    if(ndotl > -0.0){
-        gl_FragColor = color;
-        return;
-    }
+
+    #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;
diff --git a/jme3-core/src/main/resources/Common/MatDefs/Shadow/PostShadowFilter.j3md b/jme3-core/src/main/resources/Common/MatDefs/Shadow/PostShadowFilter.j3md
index ced2f9fdb..c1000f8d3 100644
--- a/jme3-core/src/main/resources/Common/MatDefs/Shadow/PostShadowFilter.j3md
+++ b/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
         }