diff options
Diffstat (limited to 'source/blender/draw/intern/shaders/common_aabb_lib.glsl')
-rw-r--r-- | source/blender/draw/intern/shaders/common_aabb_lib.glsl | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/source/blender/draw/intern/shaders/common_aabb_lib.glsl b/source/blender/draw/intern/shaders/common_aabb_lib.glsl new file mode 100644 index 00000000000..b5f664a6779 --- /dev/null +++ b/source/blender/draw/intern/shaders/common_aabb_lib.glsl @@ -0,0 +1,59 @@ + +#pragma BLENDER_REQUIRE(common_shape_lib.glsl) + +/* ---------------------------------------------------------------------- */ +/** \name Axis Aligned Bound Box + * \{ */ + +struct AABB { + vec3 min, max; +}; + +AABB aabb_init_min_max() +{ + AABB aabb; + aabb.min = vec3(1.0e30); + aabb.max = vec3(-1.0e30); + return aabb; +} + +void aabb_merge(inout AABB aabb, vec3 v) +{ + aabb.min = min(aabb.min, v); + aabb.max = max(aabb.max, v); +} + +/** + * Return true if there is any intersection. + */ +bool aabb_intersect(AABB a, AABB b) +{ + return all(greaterThanEqual(min(a.max, b.max), max(a.min, b.min))); +} + +/** + * Compute intersect intersection volume of \a a and \a b. + * Return true if the resulting volume is not empty. + */ +bool aabb_clip(AABB a, AABB b, out AABB c) +{ + c.min = max(a.min, b.min); + c.max = min(a.max, b.max); + return all(greaterThanEqual(c.max, c.min)); +} + +Box aabb_to_box(AABB aabb) +{ + Box box; + box.corners[0] = aabb.min; + box.corners[1] = vec3(aabb.max.x, aabb.min.y, aabb.min.z); + box.corners[2] = vec3(aabb.max.x, aabb.max.y, aabb.min.z); + box.corners[3] = vec3(aabb.min.x, aabb.max.y, aabb.min.z); + box.corners[4] = vec3(aabb.min.x, aabb.min.y, aabb.max.z); + box.corners[5] = vec3(aabb.max.x, aabb.min.y, aabb.max.z); + box.corners[6] = aabb.max; + box.corners[7] = vec3(aabb.min.x, aabb.max.y, aabb.max.z); + return box; +} + +/** \} */ |