diff --git a/src/mesa/program/prog_to_nir.c b/src/mesa/program/prog_to_nir.c
index 5289f0cb4f2..95bcde2937e 100644
--- a/src/mesa/program/prog_to_nir.c
+++ b/src/mesa/program/prog_to_nir.c
@@ -534,25 +534,8 @@ ptn_tex(struct ptn_compile *c, nir_alu_dest dest, nir_ssa_def **src,
       abort();
    }
 
-   switch (instr->sampler_dim) {
-   case GLSL_SAMPLER_DIM_1D:
-   case GLSL_SAMPLER_DIM_BUF:
-      instr->coord_components = 1;
-      break;
-   case GLSL_SAMPLER_DIM_2D:
-   case GLSL_SAMPLER_DIM_RECT:
-   case GLSL_SAMPLER_DIM_EXTERNAL:
-   case GLSL_SAMPLER_DIM_MS:
-      instr->coord_components = 2;
-      break;
-   case GLSL_SAMPLER_DIM_3D:
-   case GLSL_SAMPLER_DIM_CUBE:
-      instr->coord_components = 3;
-      break;
-   case GLSL_SAMPLER_DIM_SUBPASS:
-   case GLSL_SAMPLER_DIM_SUBPASS_MS:
-      unreachable("can't reach");
-   }
+   instr->coord_components =
+      glsl_get_sampler_dim_coordinate_components(instr->sampler_dim);
 
    nir_variable *var = c->sampler_vars[prog_inst->TexSrcUnit];
    if (!var) {