+static nir_ssa_def *
+get_texture_size(nir_builder *b, nir_tex_instr *tex)
+{
+ b->cursor = nir_before_instr(&tex->instr);
+
+ nir_tex_instr *txs;
+
+ txs = nir_tex_instr_create(b->shader, 1);
+ txs->op = nir_texop_txs;
+ txs->sampler_dim = tex->sampler_dim;
+ txs->is_array = tex->is_array;
+ txs->is_shadow = tex->is_shadow;
+ txs->is_new_style_shadow = tex->is_new_style_shadow;
+ txs->texture_index = tex->texture_index;
+ txs->texture = nir_deref_var_clone(tex->texture, txs);
+ txs->sampler_index = tex->sampler_index;
+ txs->sampler = nir_deref_var_clone(tex->sampler, txs);
+ txs->dest_type = nir_type_int;
+
+ /* only single src, the lod: */
+ txs->src[0].src = nir_src_for_ssa(nir_imm_int(b, 0));
+ txs->src[0].src_type = nir_tex_src_lod;
+
+ nir_ssa_dest_init(&txs->instr, &txs->dest,
+ nir_tex_instr_dest_size(txs), 32, NULL);
+ nir_builder_instr_insert(b, &txs->instr);
+
+ return nir_i2f32(b, &txs->dest.ssa);
+}
+