Work on geometry shader based shadows

shader/shadow/combine.geom

@@ -0,0 +1,30 @@
+#version 450 core
+layout (points) in;
+layout (triangle_strip, max_vertices = 4) out;
+layout (invocations = 20) in;
+layout (std140, binding = 1) uniform LightsBlock
+{
+    vec4 posBool[20];
+    vec4 colRad[20];
+} ;
+out vec3 gTexPos;
+float theBool = posBool[gl_InvocationID].w;
+float l = gl_InvocationID;
+void main()
+{
+    if (theBool == 1){
+        gTexPos = vec3(0,1,l);
+        gl_Position = vec4(-1,1,0,1) ;
+        EmitVertex();
+        gTexPos = vec3(0,0,l);
+        gl_Position = vec4(-1,-1,0,1) ;
+        EmitVertex();
+        gTexPos = vec3(1,1,l);
+        gl_Position = vec4(1,1,0,1) ;
+        EmitVertex();
+        gTexPos = vec3(1,0,l);
+        gl_Position = vec4(1,-1,0,1) ;
+        EmitVertex();
+    EndPrimitive();
+    }else {}
+}