From b43c4058c9a968aa4c0625711ce27ad0187ddce2 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Thu, 24 Oct 2019 08:04:43 -0400
Subject: render: Restructure 3D modules and add basic support for OBJ models.

---
 examples/model.scm | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 examples/model.scm

(limited to 'examples/model.scm')

diff --git a/examples/model.scm b/examples/model.scm
new file mode 100644
index 0000000..cc73918
--- /dev/null
+++ b/examples/model.scm
@@ -0,0 +1,73 @@
+(use-modules (chickadee)
+             (chickadee math)
+             (chickadee math matrix)
+             (chickadee math vector)
+             (chickadee render)
+             (chickadee render model)
+             (chickadee render font)
+             (ice-9 format))
+
+(define projection (perspective-projection (/ pi 3) (/ 4.0 3.0) 0.1 500.0))
+(define rotation (make-identity-matrix4))
+(define translation (make-identity-matrix4))
+(define view-matrix (make-identity-matrix4))
+(define model-matrix (make-identity-matrix4))
+(define position (vec3 0.0 0.0 0.0))
+(define velocity (vec3 0.0 0.0 0.0))
+(define model #f)
+(define text-position #v(4.0 464.0))
+(define text "")
+(define y-rotation 0.0)
+
+(define (reset-position)
+  (set-vec3! position 0.0 0.0 -4.0))
+
+(define (load)
+  (set! model (load-obj "models/suzanne.obj"))
+  (reset-position))
+
+(define (draw alpha)
+  (with-projection projection
+    (with-depth-test #t
+      (draw-model model model-matrix view-matrix)))
+  (draw-text text text-position))
+
+(define (update dt)
+  ;; Update camera position
+  (set-vec3! velocity
+             (+ (if (key-pressed? 'd) -1.0 0.0)
+                (if (key-pressed? 'a) 1.0 0.0))
+             0.0
+             (+ (if (key-pressed? 's) -1.0 0.0)
+                (if (key-pressed? 'w) 1.0 0.0)))
+  (vec3-normalize! velocity)
+  (vec3-mult! velocity 0.1)
+  (vec3-add! position velocity)
+  (set! text (format #f "(~6,2f, ~6,2f, ~6,2f)"
+                     (vec3-x position)
+                     (vec3-y position)
+                     (vec3-z position)))
+
+  ;; Compute new view matrix
+  (matrix4-rotate-y! rotation theta)
+  (matrix4-translate! translation position)
+  (matrix4-identity! view-matrix)
+  (matrix4-mult! view-matrix view-matrix rotation)
+  (matrix4-mult! view-matrix view-matrix translation)
+
+  ;; Rotate the model about the y-axis
+  (set! y-rotation (+ y-rotation 0.03))
+  (matrix4-rotate-y! model-matrix y-rotation))
+
+(define (key-press key scancode modifiers repeat?)
+  (cond
+   ((eq? key 'q)
+    (abort-game))
+   ((eq? key 'r)
+    (reset-position))))
+
+(run-game #:window-title "3D!"
+          #:load load
+          #:draw draw
+          #:update update
+          #:key-press key-press)
-- 
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