transfered from codeberg

source_code/frustum_module/frustum/frustum.h

@@ -0,0 +1,38 @@
+#ifndef frustum_h
+#define frustum_h
+
+#include "raylib.h"
+#include <stdbool.h>
+
+#define number_of_planes 6
+
+typedef struct frustum_plane_struct
+{
+        Vector3 normal;
+        float distance;
+} frustum_plane_struct;
+
+/**
+ * Extracts the six clipping planes from a combined View-Projection matrix.
+ * * This function utilizes the Gribb-Hartmann method to derive plane equations
+ * directly from the matrix rows. The resulting planes are normalized to ensure
+ * that the distance calculations in visibility tests are accurate.
+ */
+void extract_frustum_planes(frustum_plane_struct planes[number_of_planes], 
+                                Matrix view_projection);
+
+
+/**
+ * Checks if an Axis-Aligned Bounding Box (AABB) is within the view frustum.
+ * * This function performs a fast visibility test by finding the "positive vertex" 
+ * of the box (the corner most aligned with the plane normal). If this vertex 
+ * is outside any of the six planes, the entire box is considered culled.
+ */
+bool is_axis_aligned_bounding_box_in_frustum( const frustum_plane_struct planes
+                                                [
+                                                        number_of_planes
+                                                ], 
+                                                BoundingBox bounds);
+
+#endif
+