From 73e48b7e6472724899af8284491802e950156004 Mon Sep 17 00:00:00 2001
From: Javier Sancho <jsf@jsancho.org>
Date: Mon, 11 May 2020 08:36:03 +0200
Subject: [PATCH] get-mesh is-empty?

---
 examples/01-hello-world.scm |  2 +-
 irrlicht.scm                |  4 ++++
 irrlicht/base.scm           |  6 +++++-
 irrlicht/scene.scm          | 24 +++++++++++++++++++++++-
 4 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/examples/01-hello-world.scm b/examples/01-hello-world.scm
index b480c89..4029b7e 100644
--- a/examples/01-hello-world.scm
+++ b/examples/01-hello-world.scm
@@ -47,7 +47,7 @@
 
 ;; load a Quake2 model
 (define mesh (get-mesh scene-manager "media/sydney.md2"))
-(when (not mesh)
+(when (is-empty? mesh)
   (drop! device)
   (exit #f))
 
diff --git a/irrlicht.scm b/irrlicht.scm
index d6c4b90..2930493 100644
--- a/irrlicht.scm
+++ b/irrlicht.scm
@@ -19,11 +19,15 @@
 
 
 (define-module (irrlicht)
+  #:use-module (irrlicht base)
   #:use-module (irrlicht device)
   #:use-module (irrlicht gui)
+  #:use-module (irrlicht scene)
   #:re-export (add-static-text!
                create-device
                get-gui-environment
+               get-mesh
                get-scene-manager
                get-video-driver
+               is-empty?
                set-window-caption!))
diff --git a/irrlicht/base.scm b/irrlicht/base.scm
index 4a5d9ae..dba889b 100644
--- a/irrlicht/base.scm
+++ b/irrlicht/base.scm
@@ -23,8 +23,12 @@
   #:use-module (system foreign)
   #:export (<irrlicht-base>
             irr-class
-            irr-pointer))
+            irr-pointer
+            is-empty?))
 
 (define-class <irrlicht-base> ()
   (irr-class #:init-value "" #:getter irr-class)
   (irr-pointer #:init-value %null-pointer #:getter irr-pointer #:init-keyword #:irr-pointer))
+
+(define-method (is-empty? (obj <irrlicht-base>))
+  (equal? (irr-pointer obj) %null-pointer))
diff --git a/irrlicht/scene.scm b/irrlicht/scene.scm
index e5cd422..6f6d5e9 100644
--- a/irrlicht/scene.scm
+++ b/irrlicht/scene.scm
@@ -20,12 +20,34 @@
 
 (define-module (irrlicht scene)
   #:use-module (oop goops)
+  #:use-module (irrlicht base)
   #:use-module (irrlicht foreign)
   #:use-module (irrlicht irr))
 
 
+;; IMesh
+(define-class <mesh> (<reference-counted>)
+  (irr-class #:init-value "IMesh" #:getter irr-class))
+
+(export <mesh>)
+
+
+;; IAnimatedMesh
+(define-class <animated-mesh> (<mesh>)
+  (irr-class #:init-value "IAnimatedMesh" #:getter irr-class))
+
+(export <animated-mesh>)
+
+
 ;; ISceneManager
 (define-class <scene-manager> (<reference-counted>)
   (irr-class #:init-value "ISceneManager" #:getter irr-class))
 
-(export <scene-manager>)
+(define-method (get-mesh (scene-manager <scene-manager>) filename)
+  (make <animated-mesh>
+    #:irr-pointer
+    ((get-irrlicht-proc "getMesh" scene-manager)
+     (irr-pointer scene-manager)
+     filename)))
+
+(export <scene-manager> get-mesh)
-- 
2.39.2