Add camera module

src/SConscript

@@ -6,6 +6,7 @@ Import('env')
 
 files = Split("""
     basics.c
+    camera.c
     charles.c
     scene.c
 """)

src/camera.c

@@ -0,0 +1,38 @@
+/* camera.c
+ *
+ * Camera definitions.
+ *
+ * Eryn Wells <eryn@erynwells.me>
+ */
+
+#include <stdlib.h>
+#include "camera.h"
+
+
+Camera *
+camera_init()
+{
+    Camera *new_camera = malloc(sizeof(Camera));
+    if (new_camera == NULL) {
+        return NULL;
+    }
+
+    // Set some useful defaults.
+    new_camera->projection = CameraProjectionOrthographic;
+    new_camera->location = vector_init(0, 0, 0);
+    // The default image plane is a rectangle from (-1, 1) to (1, -1).
+    new_camera->image_plane = rect_init(-1, 1, 2, 2);
+
+    return new_camera;
+}
+
+
+void
+camera_destroy(Camera *camera)
+{
+    if (camera == NULL) {
+        return;
+    }
+
+    free(camera);
+}

src/camera.h

@@ -0,0 +1,31 @@
+/* camera.h
+ *
+ * Camera type and related functions.
+ *
+ * Eryn Wells <eryn@erynwells.me>
+ */
+
+#ifndef __CAMERA_H
+#define __CAMERA_H
+
+#include "basics.h"
+
+
+typedef enum {
+    CameraProjectionOrthographic = 1,
+} CameraProjection;
+
+
+typedef struct _Camera
+{
+    CameraProjection projection;
+    Vector3 location;
+    Rect image_plane;
+} Camera;
+
+
+Camera *camera_init();
+void camera_destroy(Camera *camera);
+
+
+#endif