+ /* Gather information required to determine which encoding to
+ * choose as well as for prefetch.
+ */
+ info.tex_base = nir_intrinsic_desc_set(bindless_tex);
+ bool tex_const = nir_src_is_const(bindless_tex->src[0]);
+ if (tex_const)
+ info.tex_idx = nir_src_as_uint(bindless_tex->src[0]);
+ info.samp_idx = 0;
+
+ /* Choose encoding. */
+ if (tex_const && info.tex_idx < 256) {
+ if (info.tex_idx < 16) {
+ /* Everything fits within the instruction */
+ info.base = info.tex_base;
+ info.combined_idx = info.samp_idx | (info.tex_idx << 4);
+ } else {
+ info.base = info.tex_base;
+ info.a1_val = info.tex_idx << 3;
+ info.combined_idx = 0;
+ info.flags |= IR3_INSTR_A1EN;
+ }
+ info.samp_tex = NULL;
+ } else {
+ info.flags |= IR3_INSTR_S2EN;
+ info.base = info.tex_base;
+
+ /* Note: the indirect source is now a vec2 instead of hvec2 */
+ struct ir3_instruction *texture, *sampler;
+
+ texture = ir3_get_src(ctx, &intr->src[0])[0];
+ sampler = create_immed(b, 0);
+ info.samp_tex = ir3_create_collect(ctx, (struct ir3_instruction*[]){
+ texture,
+ sampler,
+ }, 2);
+ }
+ } else {
+ info.flags |= IR3_INSTR_S2EN;
+ unsigned slot = nir_src_as_uint(intr->src[0]);
+ unsigned tex_idx = ir3_image_to_tex(&ctx->so->image_mapping, slot);
+ struct ir3_instruction *texture, *sampler;
+
+ texture = create_immed_typed(ctx->block, tex_idx, TYPE_U16);
+ sampler = create_immed_typed(ctx->block, tex_idx, TYPE_U16);
+
+ info.samp_tex = ir3_create_collect(ctx, (struct ir3_instruction*[]){
+ sampler,
+ texture,
+ }, 2);
+ }
+
+ return info;
+}
+
+static struct ir3_instruction *
+emit_sam(struct ir3_context *ctx, opc_t opc, struct tex_src_info info,
+ type_t type, unsigned wrmask, struct ir3_instruction *src0,
+ struct ir3_instruction *src1)
+{
+ struct ir3_instruction *sam, *addr;
+ if (info.flags & IR3_INSTR_A1EN) {
+ addr = ir3_get_addr1(ctx, info.a1_val);
+ }
+ sam = ir3_SAM(ctx->block, opc, type, 0b1111, info.flags,
+ info.samp_tex, src0, src1);
+ if (info.flags & IR3_INSTR_A1EN) {
+ ir3_instr_set_address(sam, addr);
+ }
+ if (info.flags & IR3_INSTR_B) {
+ sam->cat5.tex_base = info.base;
+ sam->cat5.samp = info.combined_idx;
+ }
+ return sam;