Add support for finishes (BRDFs).

1 files changed, 41 insertions, 0 deletions

diff --git a/libdimension/finishes.c b/libdimension/finishes.c
new file mode 100644
index 0000000..d78bc96
--- /dev/null
+++ b/libdimension/finishes.c
@@ -0,0 +1,41 @@
+/*************************************************************************
+ * Copyright (C) 2009 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library 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 Library 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.h"
+#include <stdlib.h> /* For malloc */
+
+static dmnsn_color
+dmnsn_specular_finish_fn(const dmnsn_finish *finish,
+                         dmnsn_color color, dmnsn_vector x0,
+                         dmnsn_vector normal, dmnsn_vector reflected)
+{
+  return dmnsn_color_mul(dmnsn_vector_dot(normal, reflected), color);
+}
+
+/* A specular finish */
+dmnsn_finish *
+dmnsn_new_specular_finish()
+{
+  dmnsn_finish *finish = dmnsn_new_finish();
+  if (finish) {
+    finish->finish_fn = &dmnsn_specular_finish_fn;
+  }
+  return finish;
+}