diff --git a/src/render/shader/compiler.lisp b/src/render/shader/compiler.lisp
new file mode 100644
index 0000000..877279e
--- /dev/null
+++ b/src/render/shader/compiler.lisp
@@ -0,0 +1,25 @@
+#|
+  This file is a part of stoe project.
+  Copyright (c) 2014 Renaud Casenave-Péré (renaud@casenave-pere.fr)
+|#
+
+(in-package :cl-user)
+(defpackage stoe.shader.compiler
+  (:use :cl :utils)
+  (:nicknames :compiler)
+  (:import-from :stoe.shader.glsl
+                :glsl-compile)
+  (:export :defshader))
+(in-package :stoe.shader.compiler)
+
+(defun %defshader (lambda-list body)
+  (let ((shader (glsl-compile (cons 'newshader (cons lambda-list body)))))
+    shader))
+
+(defmacro defshader (name lambda-list &body body)
+  "Define a shader defining function.
+The newly created shader will be put in a special package: `%stoe.shaders'."
+  (let ((symbol (intern (symbol-name name) :%stoe.shaders)))
+    `(progn
+       (set ',symbol (%defshader ',lambda-list ',body))
+       ',symbol)))
diff --git a/src/render/shader/glsl.lisp b/src/render/shader/glsl.lisp
new file mode 100644
index 0000000..a2b28e5
--- /dev/null
+++ b/src/render/shader/glsl.lisp
@@ -0,0 +1,38 @@
+#|
+  This file is a part of stoe project.
+  Copyright (c) 2014 Renaud Casenave-Péré (renaud@casenave-pere.fr)
+|#
+
+(in-package :cl-user)
+(defpackage stoe.shader.glsl
+  (:use :cl :utils)
+  (:nicknames :glsl)
+  (:import-from :stoe.shader.walker
+                :defhandler
+                :walk
+                :walk-list
+                :walk-1)
+  (:export :compile))
+(in-package :stoe.shader.glsl)
+
+(defvar *form-handlers* (make-hash-table)
+  "Hash table for the form handlers for a glsl dsl.")
+
+(defvar *current-indent* 0
+  "Keep the number of space needed for the next directive.")
+
+(defhandler newshader (newshader lambda-list &rest body)
+  (walk-list body))
+
+(defun default-handler (first &rest rest)
+  "Handle a simple function call."
+  (format nil "~@[~vt~]~(~a~) (~{~a~^, ~});~%"
+          (when (> *current-indent* 0)
+            *current-indent*)
+          (if (symbolp first)
+              first
+              (walk-1 first)) (walk-list rest)))
+
+(defun glsl-compile (form)
+  (let ((*current-indent* 0))
+    (walk form *form-handlers* #'default-handler)))
diff --git a/stoe.asd b/stoe.asd
index 340880e..4635d26 100644
--- a/stoe.asd
+++ b/stoe.asd
@@ -59,7 +59,10 @@
                           ((:file "gl-utils")
                            (:module "shader"
                                     :components
-                                    ((:file "glsl-compiler")
+                                    ((:file "walker")
+                                     (:file "glsl")
+                                     (:file "compiler")
+                                     (:file "glsl-compiler")
                                      (:file "shader")))
                            (:file "mesh")
                            (:file "render")