ttn: add buffer texture type

Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Rob Clark <robclark@freedesktop.org>

src/gallium/auxiliary/nir/tgsi_to_nir.c

@@ -999,6 +999,9 @@ static void
 setup_texture_info(nir_tex_instr *instr, unsigned texture)
 {
    switch (texture) {
+   case TGSI_TEXTURE_BUFFER:
+      instr->sampler_dim = GLSL_SAMPLER_DIM_BUF;
+      break;
    case TGSI_TEXTURE_1D:
       instr->sampler_dim = GLSL_SAMPLER_DIM_1D;
       break;