Add alternate shadow volume rendering pathway (layered geo)

shader/shadow/light.frag

@@ -4,9 +4,9 @@ layout (std140, binding = 1) uniform LightsBlock
     vec4 posBool[20];
     vec4 colRad[20];
 } ;
-uniform int lightID;
-vec3 lightPos = posBool[lightID].xyz;
-vec4 lumRad = colRad[lightID];
+//uniform int lightID;
+vec3 lightPos = posBool[gl_Layer].xyz;
+vec4 lumRad = colRad[gl_Layer];
 uniform sampler2D screenTexture;
 in vec2 gTexPos;
 out vec4 fColor;
@@ -17,6 +17,6 @@ void main()
     if (dist > lumRad.a) {discard;}
     float x = 1 - dist / lumRad.a ;
     vec3 c = (x * x * x) * lumRad.rgb ;
-    //fColor = vec4(c,0);
-    fColor = vec4(1,0,0,0);
+    fColor = vec4(c,0);
+    //fColor = vec4(0.05,0,0,0);
 }