/*
* Load all reference Y samples from neighboring macroblocks
* Copyright © <2010>, Intel Corporation.
*
* This program is licensed under the terms and conditions of the
* Eclipse Public License (EPL), version 1.0. The full text of the EPL is at
* http://www.opensource.org/licenses/eclipse-1.0.php.
*
*/
#if !defined(__LOAD_INTRA_REF_Y__) // Make sure this is only included once
#define __LOAD_INTRA_REF_Y__
// Module name: load_Intra_Ref_Y.asm
//
// Load all reference Y samples from neighboring macroblocks
//
load_Intra_Ref_Y:
// shl (2) I_ORIX<1>:uw ORIX<2;2,1>:ub 4:w // Convert MB origin to pixel unit
// First load top 28x1 row reference samples
// 4 from macroblock D (actually use 1), 16 from macroblock B, and 8 from macroblock C
//
add (2) MSGSRC.0<1>:d I_ORIX<2;2,1>:w TOP_REF_OFFSET<2;2,1>:b {NoDDClr} // Reference samples positioned at (-4, -1)
mov (1) MSGSRC.2:ud 0x0000001B:ud {NoDDChk} // Block width and height (28x1)
add (1) MSGDSC REG_MBAFF_FIELD<0;1,0>:uw RESP_LEN(1)+DWBRMSGDSC_RC+DESTY:ud // Set message descriptor
send (8) INTRA_REF_TOP_D(0) MSGHDRY0 MSGSRC<8;8,1>:ud DAPREAD MSGDSC
// Then load left 4x16 reference samples (actually use 1x16 column)
//
add (1) MSGSRC.1<1>:d MSGSRC.1<0;1,0>:d 1:w {NoDDClr} // Reference samples positioned next row
mov (1) MSGSRC.2:ud 0x00F0003:ud {NoDDChk} // Block width and height (4x16)
add (1) MSGDSC MSGDSC RESP_LEN(1):ud // Need to read 1 more GRF register
send (8) INTRA_REF_LEFT_D(0) MSGHDRY1 MSGSRC<8;8,1>:ud DAPREAD MSGDSC
RETURN
// End of load_Intra_Ref_Y
#endif // !defined(__LOAD_INTRA_REF_Y__)