From 82f71b0d13788b1cff9a24c5b652effd11631523 Mon Sep 17 00:00:00 2001
From: Colin Okay <colin@cicadas.surf>
Date: Wed, 29 Jun 2022 11:54:24 -0500
Subject: [refactor] [structure] modularized project file structure

---
 src/gl/shader.lisp | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 src/gl/shader.lisp

(limited to 'src/gl/shader.lisp')

diff --git a/src/gl/shader.lisp b/src/gl/shader.lisp
new file mode 100644
index 0000000..4bba7b8
--- /dev/null
+++ b/src/gl/shader.lisp
@@ -0,0 +1,42 @@
+;;;; shader.lisp
+
+(in-package #:wheelwork)
+
+(defun shader-by-type (type)
+  (case type
+    (:vertex :vertex-shader)
+    (:geometry :geometry-shader)
+    (:fragment :fragment-shader)))
+
+(defun gl-shader (type stage)
+  (let ((shader (gl:create-shader type)))
+    (gl:shader-source shader (varjo:glsl-code stage))
+    (gl:compile-shader shader)
+    (unless (gl:get-shader shader :compile-status)
+      (error "failed to compile ~a shader:~%~a~%"
+             type (gl:get-shader-info-log shader)))
+    shader))
+
+(defun create-shader (&rest sources)
+  (let* ((stages
+          (varjo:rolling-translate
+           (mapcar (lambda (source)
+                     (destructuring-bind (type inputs uniforms code) source
+                       (varjo:make-stage type inputs uniforms '(:330) code)))
+                   sources)))
+         (shaders
+          (loop
+             :for stage :in stages
+             :for source :in sources
+             :collect (gl-shader (shader-by-type (car source))
+                                 stage)))
+         (program (gl:create-program)))
+    (dolist (shader shaders) (gl:attach-shader program shader))
+    (gl:link-program program)
+    (unless (gl:get-program program :link-status)
+      (error "failed to link program: ~%~a~%"
+             (gl:get-program-info-log program)))
+    (dolist (shader shaders)
+      (gl:detach-shader program shader)
+      (gl:delete-shader shader))
+    program))
-- 
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