+ uint32_t base_binding_table_index = (inst->opcode == SHADER_OPCODE_TG4 ||
+ inst->opcode == SHADER_OPCODE_TG4_OFFSET)
+ ? prog_data->binding_table.gather_texture_start
+ : prog_data->binding_table.texture_start;
+
+ if (sampler_index.file == BRW_IMMEDIATE_VALUE) {
+ uint32_t sampler = sampler_index.dw1.ud;
+
+ brw_SAMPLE(p,
+ retype(dst, BRW_REGISTER_TYPE_UW),
+ inst->base_mrf,
+ src,
+ sampler + base_binding_table_index,
+ sampler % 16,
+ msg_type,
+ rlen,
+ inst->mlen,
+ inst->header_present,
+ simd_mode,
+ return_format);
+
+ brw_mark_surface_used(prog_data, sampler + base_binding_table_index);
+ } else {
+ /* Non-const sampler index */
+ /* Note: this clobbers `dst` as a temporary before emitting the send */
+
+ struct brw_reg addr = vec1(retype(brw_address_reg(0), BRW_REGISTER_TYPE_UD));
+ struct brw_reg temp = vec1(retype(dst, BRW_REGISTER_TYPE_UD));
+
+ struct brw_reg sampler_reg = vec1(retype(sampler_index, BRW_REGISTER_TYPE_UD));
+
+ brw_push_insn_state(p);
+ brw_set_default_mask_control(p, BRW_MASK_DISABLE);
+ brw_set_default_access_mode(p, BRW_ALIGN_1);
+
+ /* Some care required: `sampler` and `temp` may alias:
+ * addr = sampler & 0xff
+ * temp = (sampler << 8) & 0xf00
+ * addr = addr | temp
+ */
+ brw_ADD(p, addr, sampler_reg, brw_imm_ud(base_binding_table_index));
+ brw_SHL(p, temp, sampler_reg, brw_imm_ud(8u));
+ brw_AND(p, temp, temp, brw_imm_ud(0x0f00));
+ brw_AND(p, addr, addr, brw_imm_ud(0x0ff));
+ brw_OR(p, addr, addr, temp);
+
+ /* a0.0 |= <descriptor> */
+ brw_inst *insn_or = brw_next_insn(p, BRW_OPCODE_OR);
+ brw_set_sampler_message(p, insn_or,
+ 0 /* surface */,
+ 0 /* sampler */,
+ msg_type,
+ rlen,
+ inst->mlen /* mlen */,
+ inst->header_present /* header */,
+ simd_mode,
+ return_format);
+ brw_inst_set_exec_size(p->brw, insn_or, BRW_EXECUTE_1);
+ brw_inst_set_src1_reg_type(p->brw, insn_or, BRW_REGISTER_TYPE_UD);
+ brw_set_src0(p, insn_or, addr);
+ brw_set_dest(p, insn_or, addr);
+
+
+ /* dst = send(offset, a0.0) */
+ brw_inst *insn_send = brw_next_insn(p, BRW_OPCODE_SEND);
+ brw_set_dest(p, insn_send, dst);
+ brw_set_src0(p, insn_send, src);
+ brw_set_indirect_send_descriptor(p, insn_send, BRW_SFID_SAMPLER, addr);
+
+ brw_pop_insn_state(p);
+
+ /* visitor knows more than we do about the surface limit required,
+ * so has already done marking.
+ */
+ }