gallivm/nir: split tex/sampler indirect offsets

vulkan has these separate, should be fine for GL as well as
the values will be the same anyways.

Fixes:
dEQP-VK.binding_model.shader_access.secondary_cmd_buf.uniform_texel_buffer.*
dEQP-VK.binding_model.descriptorset_random.sets4.noarray.ubolimitlow.sbolimitlow.sampledimglow.outimgtexlow.noiub.uab.vert.noia*
dEQP-VK.binding_model.descriptor_copy.graphics.uniform_texel_buffer.*

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6339>
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_nir.c b/src/gallium/auxiliary/gallivm/lp_bld_nir.c
index c7a4973..fe5068b 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_nir.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_nir.c
@@ -1775,11 +1775,17 @@
          coords[4] = lp_build_mul(&bld_base->base, coords[4], projector);
    }
 
-   uint32_t base_index = 0;
-   if (!texture_deref_instr) {
+   uint32_t samp_base_index = 0, tex_base_index = 0;
+   if (!sampler_deref_instr) {
       int samp_src_index = nir_tex_instr_src_index(instr, nir_tex_src_sampler_handle);
       if (samp_src_index == -1) {
-         base_index = instr->sampler_index;
+         samp_base_index = instr->sampler_index;
+      }
+   }
+   if (!texture_deref_instr) {
+      int tex_src_index = nir_tex_instr_src_index(instr, nir_tex_src_texture_handle);
+      if (tex_src_index == -1) {
+         tex_base_index = instr->texture_index;
       }
    }
 
@@ -1798,9 +1804,9 @@
    sample_key |= lod_property << LP_SAMPLER_LOD_PROPERTY_SHIFT;
    params.sample_key = sample_key;
    params.offsets = offsets;
-   params.texture_index = base_index;
+   params.texture_index = tex_base_index;
    params.texture_index_offset = texture_unit_offset;
-   params.sampler_index = base_index;
+   params.sampler_index = samp_base_index;
    params.coords = coords;
    params.texel = texel;
    params.lod = explicit_lod;