From 44efb383a97a50c319ad1110f2619274da2e2a57 Mon Sep 17 00:00:00 2001
From: Anselme <anselme.francois@gmail.com>
Date: Tue, 19 Jul 2016 17:25:35 +0200
Subject: [PATCH] added point light shadow generation shaders

---
 shaders/shadow.frag.glsl | 12 ++++++++++++
 shaders/shadow.geom.glsl | 31 ++++++++++++++++++++++---------
 2 files changed, 34 insertions(+), 9 deletions(-)

diff --git a/shaders/shadow.frag.glsl b/shaders/shadow.frag.glsl
index f166d2b..7b9aab7 100644
--- a/shaders/shadow.frag.glsl
+++ b/shaders/shadow.frag.glsl
@@ -5,11 +5,23 @@ in vec2 varTexCoord;
 
 out float fragmentdepth;
 
+#ifdef POINT_LIGHT
+in vec4 FragPos;
+
+uniform vec3 pointLight;
+uniform float far_plane;
+#endif
+
 void main()
 {
     #ifdef ALPHA_MASK
     if(texture(alphaMask, varTexCoord).r < 0.5)
         discard;
     #endif
+	
+	#ifdef POINT_LIGHT
+    fragmentdepth = length(FragPos.xyz - pointLight)/far_plane;
+	#else
     fragmentdepth = gl_FragCoord.z;
+	#endif
 }
diff --git a/shaders/shadow.geom.glsl b/shaders/shadow.geom.glsl
index ea50e6d..8313a46 100644
--- a/shaders/shadow.geom.glsl
+++ b/shaders/shadow.geom.glsl
@@ -1,16 +1,14 @@
+layout(triangles) in;
+
+#ifdef POINT_LIGHT
+
 // inspired from
 // http://learnopengl.com/#!Advanced-Lighting/Shadows/Point-Shadows
 
-layout(triangles) in;
 layout(triangle_strip, max_vertices = 18) out;
 
-#ifdef POINT_LIGHT
-uniform mat4 MVP[6];
-#elif defined CASCADED
-uniform mat4 frontShadowMVP;
-uniform mat4 midShadowMVP;
-uniform mat4 backShadowMVP;
-#endif
+uniform mat4 projectionMatrix;
+uniform mat4 viewMatrices[6];
 
 out vec4 FragPos;
 
@@ -19,13 +17,28 @@ flat out int fcolor_idx;
 
 void main(void){
     for (int layerId = 0; layerId < 6; ++layerId){
+		mat4 MVP = projectionMatrix * viewMatrices[layerId];
         for (int i = 0; i < gl_in.length(); ++i){
             gl_Layer = layerId;
             fcolor_idx = layerId;
             FragPos = gl_in[i].gl_Position;
-            gl_Position = MVP[layerId] * FragPos;
+            gl_Position = MVP * FragPos;
             EmitVertex();
         }
         EndPrimitive();
     }
 }
+
+#elif defined CASCADED
+
+layout(triangle_strip, max_vertices = 9) out;
+
+uniform mat4 frontShadowMVP;
+uniform mat4 midShadowMVP;
+uniform mat4 backShadowMVP;
+
+// TODO
+
+#endif
+
+