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author | Clément Foucault <foucault.clem@gmail.com> | 2022-07-13 16:01:47 +0300 |
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committer | Clément Foucault <foucault.clem@gmail.com> | 2022-07-21 16:50:35 +0300 |
commit | 2bad3577c079a738030ec252e906122c24315e98 (patch) | |
tree | 301cf3b9178a028ea911eab14d4e2cb164d7cdf9 /source/blender/draw/intern/shaders | |
parent | 4ba6bac2f1a45fbd0715dd076992cf21f41f262f (diff) |
DRW: common_math_geom_lib.glsl: Add line_aabb_clipping_dist
Diffstat (limited to 'source/blender/draw/intern/shaders')
-rw-r--r-- | source/blender/draw/intern/shaders/common_math_geom_lib.glsl | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/source/blender/draw/intern/shaders/common_math_geom_lib.glsl b/source/blender/draw/intern/shaders/common_math_geom_lib.glsl index 6d4452c18c8..af8a8cd8784 100644 --- a/source/blender/draw/intern/shaders/common_math_geom_lib.glsl +++ b/source/blender/draw/intern/shaders/common_math_geom_lib.glsl @@ -90,6 +90,23 @@ float line_unit_box_intersect_dist_safe(vec3 lineorigin, vec3 linedirection) return line_unit_box_intersect_dist(lineorigin, safe_linedirection); } +/** + * Returns clipping distance (intersection with the nearest plane) with the given axis-aligned + * bound box along \a line_direction. + * Safe even if \a line_direction is degenerate. + * It assumes that an intersection exists (i.e: that \a line_direction points towards the AABB). + */ +float line_aabb_clipping_dist(vec3 line_origin, vec3 line_direction, vec3 aabb_min, vec3 aabb_max) +{ + vec3 safe_dir = select(line_direction, vec3(1e-5), lessThan(abs(line_direction), vec3(1e-5))); + vec3 dir_inv = 1.0 / safe_dir; + + vec3 first_plane = (aabb_min - line_origin) * dir_inv; + vec3 second_plane = (aabb_max - line_origin) * dir_inv; + vec3 nearest_plane = min(first_plane, second_plane); + return max_v3(nearest_plane); +} + /** \} */ /* ---------------------------------------------------------------------- */ |