diff options
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_vec4_generator.cpp | 52 |
1 files changed, 51 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp b/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp index 2bf72c17862..1b1e64773e6 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp +++ b/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp @@ -383,7 +383,57 @@ vec4_generator::generate_tex(vec4_instruction *inst, brw_mark_surface_used(&prog_data->base, sampler + base_binding_table_index); } else { - /* XXX: Non-constant sampler index. */ + /* Non-constant 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, + 1 /* rlen */, + inst->mlen /* mlen */, + inst->header_present /* header */, + BRW_SAMPLER_SIMD_MODE_SIMD4X2, + 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. + */ } } |