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/gpu/shaders/material/gpu_shader_material_light_falloff.glsl b/source/blender/gpu/shaders/material/gpu_shader_material_light_falloff.glsl
index f3eae653f95..e1c7a00646f 100644
--- a/source/blender/gpu/shaders/material/gpu_shader_material_light_falloff.glsl
+++ b/source/blender/gpu/shaders/material/gpu_shader_material_light_falloff.glsl
@@ -1,7 +1,7 @@
 void node_light_falloff(
-    float strength, float tsmooth, out float quadratic, out float linear, out float constant)
+    float strength, float tsmooth, out float quadratic, out float linear, out float falloff_constant)
 {
   quadratic = strength;
   linear = strength;
-  constant = strength;
+  falloff_constant = strength;
 }