Subdiv: Cleanup, de-duplicate tangent matrix calculation

1 files changed, 68 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/multires_inline.h b/source/blender/blenkernel/intern/multires_inline.h
new file mode 100644
index 00000000000..fe01fb6e221
--- /dev/null
+++ b/source/blender/blenkernel/intern/multires_inline.h
@@ -0,0 +1,68 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2018 by Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): Sergey Sharybin.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/blenkernel/intern/multires_inline.h
+ *  \ingroup bke
+ */
+
+#ifndef __BKE_MULTIRES_INLINE_H__
+#define __BKE_MULTIRES_INLINE_H__
+
+#include "BKE_multires.h"
+#include "BLI_math_vector.h"
+
+BLI_INLINE void BKE_multires_construct_tangent_matrix(
+        float tangent_matrix[3][3],
+        const float dPdu[3],
+        const float dPdv[3],
+        const int corner)
+{
+	if (corner == 0) {
+		copy_v3_v3(tangent_matrix[0], dPdv);
+		copy_v3_v3(tangent_matrix[1], dPdu);
+		mul_v3_fl(tangent_matrix[0], -1.0f);
+		mul_v3_fl(tangent_matrix[1], -1.0f);
+	}
+	else if (corner == 1) {
+		copy_v3_v3(tangent_matrix[0], dPdu);
+		copy_v3_v3(tangent_matrix[1], dPdv);
+		mul_v3_fl(tangent_matrix[1], -1.0f);
+	}
+	else if (corner == 2) {
+		copy_v3_v3(tangent_matrix[0], dPdv);
+		copy_v3_v3(tangent_matrix[1], dPdu);
+	}
+	else if (corner == 3) {
+		copy_v3_v3(tangent_matrix[0], dPdu);
+		copy_v3_v3(tangent_matrix[1], dPdv);
+		mul_v3_fl(tangent_matrix[0], -1.0f);
+	}
+	cross_v3_v3v3(tangent_matrix[2], dPdu, dPdv);
+	normalize_v3(tangent_matrix[0]);
+	normalize_v3(tangent_matrix[1]);
+	normalize_v3(tangent_matrix[2]);
+}
+
+#endif  /* __BKE_MULTIRES_INLINE_H__ */