1 files changed, 72 insertions, 0 deletions
diff --git a/libdimension/model/pigment.c b/libdimension/model/pigment.c
new file mode 100644
index 0000000..a8c7c0b
--- /dev/null
+++ b/libdimension/model/pigment.c
@@ -0,0 +1,72 @@
+/*************************************************************************
+ * Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.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/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * Pigments.
+ */
+
+#include "dimension/model.h"
+
+// Allocate a dummy pigment
+dmnsn_pigment *
+dmnsn_new_pigment(dmnsn_pool *pool)
+{
+  dmnsn_pigment *pigment = DMNSN_PALLOC(pool, dmnsn_pigment);
+  dmnsn_init_pigment(pigment);
+  return pigment;
+}
+
+// Initialize a pigment
+void
+dmnsn_init_pigment(dmnsn_pigment *pigment)
+{
+  pigment->pigment_fn = NULL;
+  pigment->initialize_fn = NULL;
+  pigment->trans = dmnsn_identity_matrix();
+  pigment->quick_color = DMNSN_TCOLOR(dmnsn_black);
+  pigment->initialized = false;
+}
+
+// Precompute pigment properties
+void
+dmnsn_pigment_initialize(dmnsn_pigment *pigment)
+{
+  dmnsn_assert(!pigment->initialized, "Pigment double-initialized.");
+  pigment->initialized = true;
+
+  if (pigment->initialize_fn) {
+    pigment->initialize_fn(pigment);
+  }
+
+  pigment->trans_inv = dmnsn_matrix_inverse(pigment->trans);
+}
+
+// Evaluate a pigment
+dmnsn_tcolor
+dmnsn_pigment_evaluate(const dmnsn_pigment *pigment, dmnsn_vector v)
+{
+  if (pigment->pigment_fn) {
+    dmnsn_vector v_trans = dmnsn_transform_point(pigment->trans_inv, v);
+    return pigment->pigment_fn(pigment, v_trans);
+  } else {
+    return pigment->quick_color;
+  }
+}