1 files changed, 111 insertions, 0 deletions
diff --git a/libdimension-python/PerspectiveCamera.c b/libdimension-python/PerspectiveCamera.c
new file mode 100644
index 0000000..f144498
--- /dev/null
+++ b/libdimension-python/PerspectiveCamera.c
@@ -0,0 +1,111 @@
+/*************************************************************************
+ * Copyright (C) 2009-2011 Tavian Barnes <tavianator@tavianator.com>     *
+ *                                                                       *
+ * This file is part of The Dimension Python Module.                     *
+ *                                                                       *
+ * The Dimension Python Module is free software; you can redistribute it *
+ * and/ or modify it under the terms of the GNU Lesser General Public    *
+ * License as published by the Free Software Foundation; either version  *
+ * 3 of the License, or (at your option) any later version.              *
+ *                                                                       *
+ * The Dimension Python Module is distributed in the hope that it will   *
+ * be useful, but WITHOUT ANY WARRANTY; without even the implied         *
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See *
+ * the GNU Lesser General Public License for more details.               *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+#include "dimension-python.h"
+
+static int
+dmnsn_py_PerspectiveCamera_init(dmnsn_py_PerspectiveCamera *self,
+                                PyObject *args, PyObject *kwds)
+{
+  if (dmnsn_py_CameraType.tp_init((PyObject *)self, NULL, NULL) < 0)
+    return -1;
+
+  static char *kwlist[] = { "location", "look_at", NULL };
+
+  dmnsn_vector location, look_at;
+  if (!PyArg_ParseTupleAndKeywords(args, kwds, "O&O&", kwlist,
+                                   &dmnsn_py_VectorParse, &location,
+                                   &dmnsn_py_VectorParse, &look_at))
+    return -1;
+
+  self->location = location;
+  self->look_at = look_at;
+
+  dmnsn_delete_camera(self->base.camera);
+  self->base.camera = dmnsn_new_perspective_camera();
+  DMNSN_INCREF(self->base.camera);
+  return 0;
+}
+
+static PyObject *
+dmnsn_py_PerspectiveCamera_initialize(dmnsn_py_PerspectiveCamera *self)
+{
+  dmnsn_vector look_at = dmnsn_vector_sub(self->look_at, self->location);
+
+  /* Align the camera with the look_at point */
+
+  dmnsn_vector right   = dmnsn_x;
+  dmnsn_vector up      = dmnsn_y;
+  dmnsn_vector forward = dmnsn_z;
+
+  dmnsn_vector theta = dmnsn_vector_mul(
+    dmnsn_vector_axis_angle(forward, look_at, up),
+    up
+  );
+  dmnsn_matrix align = dmnsn_rotation_matrix(theta);
+
+  right   = dmnsn_transform_vector(align, right);
+  forward = dmnsn_transform_vector(align, forward);
+
+  theta = dmnsn_vector_mul(
+    dmnsn_vector_axis_angle(forward, look_at, right),
+    right
+  );
+  align = dmnsn_matrix_mul(dmnsn_rotation_matrix(theta), align);
+
+  /* Translate the camera to the location */
+  dmnsn_matrix move = dmnsn_translation_matrix(self->location);
+
+  dmnsn_matrix trans = dmnsn_matrix_mul(move, align);
+  self->base.camera->trans = dmnsn_matrix_mul(self->base.camera->trans,
+                                              trans);
+
+  Py_INCREF(Py_None);
+  return Py_None;
+}
+
+static PyMethodDef dmnsn_py_PerspectiveCamera_methods[] = {
+  { "initialize", (PyCFunction)dmnsn_py_PerspectiveCamera_initialize,
+    METH_NOARGS, "Initialize a perspective camera" },
+  { NULL }
+};
+
+static PyGetSetDef dmnsn_py_PerspectiveCamera_getsetters[] = {
+  { NULL }
+};
+
+PyTypeObject dmnsn_py_PerspectiveCameraType = {
+  PyVarObject_HEAD_INIT(NULL, 0)
+  .tp_name      = "dimension.PerspectiveCamera",
+  .tp_basicsize = sizeof(dmnsn_py_PerspectiveCamera),
+  .tp_flags     = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
+  .tp_doc       = "Dimension perspective camera",
+  .tp_methods   = dmnsn_py_PerspectiveCamera_methods,
+  .tp_getset    = dmnsn_py_PerspectiveCamera_getsetters,
+  .tp_init      = (initproc)dmnsn_py_PerspectiveCamera_init,
+  .tp_base      = &dmnsn_py_CameraType,
+};
+
+bool
+dmnsn_py_init_PerspectiveCameraType(void)
+{
+  dmnsn_py_PerspectiveCameraType.tp_new = PyType_GenericNew;
+  return PyType_Ready(&dmnsn_py_PerspectiveCameraType) >= 0;
+}