Metal: Make GLSL shader source MSL compliant also

Metal shading language follows the C++ 14 standard and in some cases requires a greater level of explicitness than GLSL. There are also some small language differences:

- Explicit type-casts (C++ requirements)
- Explicit constant values (C++ requirements, e.g. floating point values using 0.0 instead of 0).
- Metal/OpenGL compatibility paths
- GLSL Function prototypes
- Explicit accessors for vector types when sampling textures.

Authored by Apple: Michael Parkin-White

Ref T96261

Reviewed By: fclem

Maniphest Tasks: T96261

Differential Revision: https://developer.blender.org/D14378

1 files changed, 1 insertions, 1 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 7b701d1d81b..6d4452c18c8 100644
--- a/source/blender/draw/intern/shaders/common_math_geom_lib.glsl
+++ b/source/blender/draw/intern/shaders/common_math_geom_lib.glsl
@@ -86,7 +86,7 @@ float line_unit_box_intersect_dist(vec3 lineorigin, vec3 linedirection)
 float line_unit_box_intersect_dist_safe(vec3 lineorigin, vec3 linedirection)
 {
   vec3 safe_linedirection = max(vec3(1e-8), abs(linedirection)) *
-                            mix(vec3(1.0), -vec3(1.0), lessThan(linedirection, vec3(0.0)));
+                            select(vec3(1.0), -vec3(1.0), lessThan(linedirection, vec3(0.0)));
   return line_unit_box_intersect_dist(lineorigin, safe_linedirection);
 }