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1 files changed, 44 insertions, 0 deletions

diff --git a/include/cglm/plane.h b/include/cglm/plane.h
new file mode 100644
index 0000000..9efabb7
--- /dev/null
+++ b/include/cglm/plane.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c), Recep Aslantas.
+ *
+ * MIT License (MIT), http://opensource.org/licenses/MIT
+ * Full license can be found in the LICENSE file
+ */
+
+#ifndef cglm_plane_h
+#define cglm_plane_h
+
+#include "common.h"
+#include "vec3.h"
+#include "vec4.h"
+
+/*
+ Plane equation:  Ax + By + Cz + D = 0;
+
+ It stored in vec4 as [A, B, C, D]. (A, B, C) is normal and D is distance
+*/
+
+/*
+ Functions:
+   CGLM_INLINE void  glm_plane_normalize(vec4 plane);
+ */
+
+/*!
+ * @brief normalizes a plane
+ *
+ * @param[in, out] plane plane to normalize
+ */
+CGLM_INLINE
+void
+glm_plane_normalize(vec4 plane) {
+  float norm;
+  
+  if (CGLM_UNLIKELY((norm = glm_vec3_norm(plane)) < FLT_EPSILON)) {
+    glm_vec4_zero(plane);
+    return;
+  }
+  
+  glm_vec4_scale(plane, 1.0f / norm, plane);
+}
+
+#endif /* cglm_plane_h */