From 4d9f72b850c7a86af3a8fb36ff8d48220a6a0914 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Thu, 2 Jul 2009 04:53:24 +0000
Subject: Provide interface to modify a perspective camera's transformation
 matrix.

---
 libdimension/cameras.c           | 19 ++++++++++++++++++-
 libdimension/dimension/cameras.h |  3 +++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/libdimension/cameras.c b/libdimension/cameras.c
index c6dcf59..f346bbc 100644
--- a/libdimension/cameras.c
+++ b/libdimension/cameras.c
@@ -60,12 +60,29 @@ dmnsn_delete_perspective_camera(dmnsn_camera *camera)
   }
 }
 
+/* Get the transformation matrix */
+dmnsn_matrix
+dmnsn_get_perspective_camera_trans(const dmnsn_camera *camera)
+{
+  dmnsn_matrix *trans = camera->ptr;
+  return *trans;
+}
+
+/* Set the transformation matrix */
+void
+dmnsn_set_perspective_camera_trans(dmnsn_camera *camera, dmnsn_matrix T)
+{
+  dmnsn_matrix *trans = camera->ptr;
+  *trans = T;
+}
+
+/* Perspective camera ray callback */
 static dmnsn_line
 dmnsn_perspective_camera_ray_fn(const dmnsn_camera *camera,
                                 const dmnsn_canvas *canvas,
                                 unsigned int x, unsigned int y)
 {
-  dmnsn_matrix *trans = (dmnsn_matrix *)camera->ptr;
+  dmnsn_matrix *trans = camera->ptr;
   dmnsn_line l;
 
   /* Rays originate at the origin, oddly enough */
diff --git a/libdimension/dimension/cameras.h b/libdimension/dimension/cameras.h
index bd9d162..a75e9b9 100644
--- a/libdimension/dimension/cameras.h
+++ b/libdimension/dimension/cameras.h
@@ -31,4 +31,7 @@
 dmnsn_camera *dmnsn_new_perspective_camera(dmnsn_matrix trans);
 void dmnsn_delete_perspective_camera(dmnsn_camera *camera);
 
+dmnsn_matrix dmnsn_get_perspective_camera_trans(const dmnsn_camera *camera);
+void dmnsn_set_perspective_camera_trans(dmnsn_camera *camera, dmnsn_matrix T);
+
 #endif /* DIMENSION_CAMERAS_H */
-- 
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