Update

resources/main/ShadowExtrudeDirLight.vert

@@ -0,0 +1,18 @@
+#include <OgreUnifiedShader.h>
+
+// Directional light extrude
+uniform mat4 worldviewproj_matrix;
+uniform vec4 light_position_object_space; // homogenous, object space
+
+MAIN_PARAMETERS
+IN(vec4 uv0, TEXCOORD0)
+IN(vec4 position, POSITION)
+MAIN_DECLARATION
+{
+    // Extrusion in object space
+    // Vertex unmodified if w==1, extruded if w==0
+    vec4 newpos =
+        (uv0.xxxx * (position + light_position_object_space)) - light_position_object_space;
+
+    gl_Position = mul(worldviewproj_matrix, newpos);
+}