+/**
+ * Read a float[4] vector from the data port Data Cache (const buffer).
+ * Location (in buffer) should be a multiple of 16.
+ * Used for fetching shader constants.
+ * If relAddr is true, we'll do an indirect fetch using the address register.
+ */
+void brw_dp_READ_4( struct brw_compile *p,
+ struct brw_reg dest,
+ GLboolean relAddr,
+ GLuint location,
+ GLuint bind_table_index )
+{
+ /* XXX: relAddr not implemented */
+ GLuint msg_reg_nr = 1;
+ {
+ struct brw_reg b;
+ brw_push_insn_state(p);
+ brw_set_predicate_control(p, BRW_PREDICATE_NONE);
+ brw_set_compression_control(p, BRW_COMPRESSION_NONE);
+ brw_set_mask_control(p, BRW_MASK_DISABLE);
+
+ /* Setup MRF[1] with location/offset into const buffer */
+ b = brw_message_reg(msg_reg_nr);
+ b = retype(b, BRW_REGISTER_TYPE_UD);
+ /* XXX I think we're setting all the dwords of MRF[1] to 'location'.
+ * when the docs say only dword[2] should be set. Hmmm. But it works.
+ */
+ brw_MOV(p, b, brw_imm_ud(location));
+ brw_pop_insn_state(p);
+ }
+
+ {
+ struct brw_instruction *insn = next_insn(p, BRW_OPCODE_SEND);
+
+ insn->header.predicate_control = BRW_PREDICATE_NONE;
+ insn->header.compression_control = BRW_COMPRESSION_NONE;
+ insn->header.destreg__conditionalmod = msg_reg_nr;
+ insn->header.mask_control = BRW_MASK_DISABLE;
+
+ /* cast dest to a uword[8] vector */
+ dest = retype(vec8(dest), BRW_REGISTER_TYPE_UW);
+
+ brw_set_dest(insn, dest);
+ brw_set_src0(insn, brw_null_reg());
+
+ brw_set_dp_read_message(p->brw,
+ insn,
+ bind_table_index,
+ 0, /* msg_control (0 means 1 Oword) */
+ BRW_DATAPORT_READ_MESSAGE_OWORD_BLOCK_READ, /* msg_type */
+ 0, /* source cache = data cache */
+ 1, /* msg_length */
+ 1, /* response_length (1 Oword) */
+ 0); /* eot */
+ }
+}
+
+
+/**
+ * Read float[4] constant(s) from VS constant buffer.
+ * For relative addressing, two float[4] constants will be read into 'dest'.
+ * Otherwise, one float[4] constant will be read into the lower half of 'dest'.
+ */
+void brw_dp_READ_4_vs(struct brw_compile *p,
+ struct brw_reg dest,
+ GLuint oword,
+ GLboolean relAddr,
+ struct brw_reg addrReg,
+ GLuint location,
+ GLuint bind_table_index)
+{
+ GLuint msg_reg_nr = 1;
+
+ assert(oword < 2);
+ /*
+ printf("vs const read msg, location %u, msg_reg_nr %d\n",
+ location, msg_reg_nr);
+ */
+
+ /* Setup MRF[1] with location/offset into const buffer */
+ {
+ struct brw_reg b;
+
+ brw_push_insn_state(p);
+ brw_set_compression_control(p, BRW_COMPRESSION_NONE);
+ brw_set_mask_control(p, BRW_MASK_DISABLE);
+ brw_set_predicate_control(p, BRW_PREDICATE_NONE);
+ /*brw_set_access_mode(p, BRW_ALIGN_16);*/
+
+ /* XXX I think we're setting all the dwords of MRF[1] to 'location'.
+ * when the docs say only dword[2] should be set. Hmmm. But it works.
+ */
+ b = brw_message_reg(msg_reg_nr);
+ b = retype(b, BRW_REGISTER_TYPE_UD);
+ /*b = get_element_ud(b, 2);*/
+ if (relAddr) {
+ brw_ADD(p, b, addrReg, brw_imm_ud(location));
+ }
+ else {
+ brw_MOV(p, b, brw_imm_ud(location));
+ }
+
+ brw_pop_insn_state(p);
+ }
+
+ {
+ struct brw_instruction *insn = next_insn(p, BRW_OPCODE_SEND);
+
+ insn->header.predicate_control = BRW_PREDICATE_NONE;
+ insn->header.compression_control = BRW_COMPRESSION_NONE;
+ insn->header.destreg__conditionalmod = msg_reg_nr;
+ insn->header.mask_control = BRW_MASK_DISABLE;
+ /*insn->header.access_mode = BRW_ALIGN_16;*/
+
+ brw_set_dest(insn, dest);
+ brw_set_src0(insn, brw_null_reg());
+
+ brw_set_dp_read_message(p->brw,
+ insn,
+ bind_table_index,
+ oword, /* 0 = lower Oword, 1 = upper Oword */
+ BRW_DATAPORT_READ_MESSAGE_OWORD_BLOCK_READ, /* msg_type */
+ 0, /* source cache = data cache */
+ 1, /* msg_length */
+ 1, /* response_length (1 Oword) */
+ 0); /* eot */
+ }
+}
+
+
+