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, 2 insertions, 2 deletions

diff --git a/source/blender/draw/intern/shaders/common_hair_lib.glsl b/source/blender/draw/intern/shaders/common_hair_lib.glsl
index ed8b8aeb849..7f94b7ea1c1 100644
--- a/source/blender/draw/intern/shaders/common_hair_lib.glsl
+++ b/source/blender/draw/intern/shaders/common_hair_lib.glsl
@@ -158,7 +158,7 @@ float hair_shaperadius(float shape, float root, float tip, float time)
   return (radius * (root - tip)) + tip;
 }
 
-#  ifdef OS_MAC
+#  if defined(OS_MAC) && defined(GPU_OPENGL)
 in float dummy;
 #  endif
 
@@ -178,7 +178,7 @@ void hair_get_pos_tan_binor_time(bool is_persp,
   wpos = data.point_position;
   time = data.point_time;
 
-#  ifdef OS_MAC
+#  if defined(OS_MAC) && defined(GPU_OPENGL)
   /* Generate a dummy read to avoid the driver bug with shaders having no
    * vertex reads on macOS (T60171) */
   wpos.y += dummy * 0.0;