Fix #116489: Improper use of enum in GLSL file

Use defines instead.

source/blender/gpu/shaders/gpu_shader_codegen_lib.glsl

@@ -128,32 +128,27 @@ vec4 tangent_get(vec4 attr, mat3 normalmat)
 #  define FrontFacing true
 #endif
 
-typedef enum ClosureType {
-  CLOSURE_NONE_ID = 0u,
-
-  /* Diffuse */
-  CLOSURE_BSDF_DIFFUSE_ID = 1u,
-  // CLOSURE_BSDF_OREN_NAYAR_ID = 2u, /* TODO */
-  // CLOSURE_BSDF_SHEEN_ID = 4u, /* TODO */
-  // CLOSURE_BSDF_DIFFUSE_TOON_ID = 5u, /* TODO */
-  CLOSURE_BSDF_TRANSLUCENT_ID = 6u,
-
-  /* Glossy */
-  CLOSURE_BSDF_MICROFACET_GGX_REFLECTION_ID = 7u,
-  // CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID = 8u, /* TODO */
-  // CLOSURE_BSDF_ASHIKHMIN_VELVET_ID = 9u, /* TODO */
-  // CLOSURE_BSDF_GLOSSY_TOON_ID = 10u, /* TODO */
-  // CLOSURE_BSDF_HAIR_REFLECTION_ID = 11u, /* TODO */
-
-  /* Transmission */
-  CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID = 12u,
-
-  /* Glass */
-  // CLOSURE_BSDF_HAIR_HUANG_ID = 13u, /* TODO */
-
-  /* BSSRDF */
-  CLOSURE_BSSRDF_BURLEY_ID = 14u,
-} ClosureType;
+/* Can't use enum here because not a header file. But would be great to do. */
+#define ClosureType uint
+#define CLOSURE_NONE_ID 0u
+/* Diffuse */
+#define CLOSURE_BSDF_DIFFUSE_ID 1u
+#define CLOSURE_BSDF_OREN_NAYAR_ID 2u   /* TODO */
+#define CLOSURE_BSDF_SHEEN_ID 4u        /* TODO */
+#define CLOSURE_BSDF_DIFFUSE_TOON_ID 5u /* TODO */
+#define CLOSURE_BSDF_TRANSLUCENT_ID 6u
+/* Glossy */
+#define CLOSURE_BSDF_MICROFACET_GGX_REFLECTION_ID 7u
+#define CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID 8u /* TODO */
+#define CLOSURE_BSDF_ASHIKHMIN_VELVET_ID 9u  /* TODO */
+#define CLOSURE_BSDF_GLOSSY_TOON_ID 10u      /* TODO */
+#define CLOSURE_BSDF_HAIR_REFLECTION_ID 11u  /* TODO */
+/* Transmission */
+#define CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID 12u
+/* Glass */
+#define CLOSURE_BSDF_HAIR_HUANG_ID 13u /* TODO */
+/* BSSRDF */
+#define CLOSURE_BSSRDF_BURLEY_ID 14u
 
 struct ClosureUndetermined {
   vec3 color;