[Bf-blender-cvs] [aa34408b038] temp-lanpr-staging: DRW: New function DRW_culling_min_max_test

[mano-wii]

Commit: aa34408b038d0cab2837f10c5e6aa0d123603215
Author: mano-wii
Date:   Thu Aug 15 10:17:41 2019 -0300
Branches: temp-lanpr-staging
https://developer.blender.org/rBaa34408b038d0cab2837f10c5e6aa0d123603215

DRW: New function DRW_culling_min_max_test

For testing intersection with frustrum planes without having to transform all bound box vertices into global space.

===================================================================

M	source/blender/draw/intern/DRW_render.h
M	source/blender/draw/intern/draw_manager_exec.c

===================================================================

diff --git a/source/blender/draw/intern/DRW_render.h b/source/blender/draw/intern/DRW_render.h
index 383b57cb74e..8e4ca1cefab 100644
--- a/source/blender/draw/intern/DRW_render.h
+++ b/source/blender/draw/intern/DRW_render.h
@@ -608,6 +608,7 @@ bool DRW_view_is_persp_get(const DRWView *view);
 bool DRW_culling_sphere_test(const DRWView *view, const BoundSphere *bsphere);
 bool DRW_culling_box_test(const DRWView *view, const BoundBox *bbox);
 bool DRW_culling_plane_test(const DRWView *view, const float plane[4]);
+bool DRW_culling_min_max_test(const DRWView *view, float obmat[4][4], float min[3], float max[3]);
 
 void DRW_culling_frustum_corners_get(const DRWView *view, BoundBox *corners);
 void DRW_culling_frustum_planes_get(const DRWView *view, float planes[6][4]);
diff --git a/source/blender/draw/intern/draw_manager_exec.c b/source/blender/draw/intern/draw_manager_exec.c
index 949d3e1d38b..3bf442b4f39 100644
--- a/source/blender/draw/intern/draw_manager_exec.c
+++ b/source/blender/draw/intern/draw_manager_exec.c
@@ -22,6 +22,7 @@
 
 #include "draw_manager.h"
 
+#include "BLI_math.h"
 #include "BLI_math_bits.h"
 #include "BLI_memblock.h"
 
@@ -488,6 +489,26 @@ bool DRW_culling_plane_test(const DRWView *view, const float plane[4])
   return draw_culling_plane_test(&view->frustum_corners, plane);
 }
 
+/* Return True if the given box intersect the current view frustum.
+ * This function will have to be replaced when world space bb per objects is implemented. */
+bool DRW_culling_min_max_test(const DRWView *view, float obmat[4][4], float min[3], float max[3])
+{
+  view = view ? view : DST.view_default;
+  float tobmat[4][4];
+  transpose_m4_m4(tobmat, obmat);
+  for (int i = 6; i--;) {
+    float frustum_plane_local[4], bb_near[3], bb_far[3];
+    mul_v4_m4v4(frustum_plane_local, tobmat, view->frustum_planes[i]);
+    aabb_get_near_far_from_plane(frustum_plane_local, min, max, bb_near, bb_far);
+
+    if (plane_point_side_v3(frustum_plane_local, bb_far) < 0.0f) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
 void DRW_culling_frustum_corners_get(const DRWView *view, BoundBox *corners)
 {
   view = view ? view : DST.view_default;