typedef enum {
   ppir_codegen_sampler_type_generic   = 0x00,
   ppir_codegen_sampler_type_cube      = 0x1F,
} ppir_codegen_sampler_type;

->

typedef enum {
   ppir_codegen_sampler_type_generic = 0x00,
   ppir_codegen_sampler_type_cube    = 0x1F,
} ppir_codegen_sampler_type;