1 files changed, 112 insertions, 0 deletions
diff --git a/libdimension/finish_combination.c b/libdimension/finish_combination.c
new file mode 100644
index 0000000..045db96
--- /dev/null
+++ b/libdimension/finish_combination.c
@@ -0,0 +1,112 @@
+/*************************************************************************
+ * 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 */
+#include <math.h>
+
+/*
+ * Finish combinations
+ */
+
+static dmnsn_color
+dmnsn_finish_combination_fn(const dmnsn_finish *finish,
+                            dmnsn_color light, dmnsn_color color,
+                            dmnsn_vector ray, dmnsn_vector normal,
+                            dmnsn_vector viewer)
+{
+  dmnsn_finish **params = finish->ptr;
+  if (params[0]->finish_fn && params[1]->finish_fn) {
+    return dmnsn_color_add((*params[0]->finish_fn)(params[0], light, color, ray,
+                                                   normal, viewer),
+                           (*params[1]->finish_fn)(params[1], light, color, ray,
+                                                   normal, viewer));
+  } else if (params[0]->finish_fn) {
+    return (*params[0]->finish_fn)(params[0], light, color, ray,
+                                   normal, viewer);
+  } else if (params[1]->finish_fn) {
+    return (*params[1]->finish_fn)(params[1], light, color, ray,
+                                   normal, viewer);
+  } else {
+    return dmnsn_black;
+  }
+}
+
+static dmnsn_color
+dmnsn_finish_combination_ambient_fn(const dmnsn_finish *finish,
+                                    dmnsn_color pigment)
+{
+  dmnsn_finish **params = finish->ptr;
+  if (params[0]->ambient_fn && params[1]->ambient_fn) {
+    return dmnsn_color_add((*params[0]->ambient_fn)(params[0], pigment),
+                           (*params[1]->ambient_fn)(params[1], pigment));
+  } else if (params[0]->ambient_fn) {
+    return (*params[0]->ambient_fn)(params[0], pigment);
+  } else if (params[1]->ambient_fn) {
+    return (*params[1]->ambient_fn)(params[1], pigment);
+  } else {
+    return dmnsn_black;
+  }
+}
+
+static void
+dmnsn_finish_combination_free_fn(void *ptr)
+{
+  dmnsn_finish **params = ptr;
+  dmnsn_delete_finish(params[0]);
+  dmnsn_delete_finish(params[1]);
+  free(ptr);
+}
+
+dmnsn_finish *
+dmnsn_new_finish_combination(dmnsn_finish *f1, dmnsn_finish *f2)
+{
+  if (f1 && f2) {
+    dmnsn_finish *finish = dmnsn_new_finish();
+    if (finish) {
+      dmnsn_finish **params = malloc(2*sizeof(dmnsn_finish *));
+      if (!params) {
+        dmnsn_delete_finish(finish);
+        dmnsn_delete_finish(f2);
+        dmnsn_delete_finish(f1);
+        return NULL;
+      }
+
+      params[0] = f1;
+      params[1] = f2;
+
+      finish->ptr        = params;
+      finish->finish_fn  = &dmnsn_finish_combination_fn;
+      finish->ambient_fn = &dmnsn_finish_combination_ambient_fn;
+      finish->free_fn    = &dmnsn_finish_combination_free_fn;
+
+      return finish;
+    } else {
+      dmnsn_delete_finish(f2);
+      dmnsn_delete_finish(f1);
+    }
+  } else if (f1) {
+    dmnsn_delete_finish(f1);
+  } else if (f2) {
+    dmnsn_delete_finish(f2);
+  }
+
+  return NULL;
+}