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/* $Id: x86_cliptest.S,v 1.2 2000/10/23 00:16:28 gareth Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "assyntax.h"
#include "clip_args.h"
#define FP_ONE 1065353216
#define FP_ZERO 0
#define SRC(i) REGOFF(i * 4, ESI)
#define DST(i) REGOFF(i * 4, EDI)
#define MAT(i) REGOFF(i * 4, EDX)
/*
* Table for clip test.
*
* bit6 = SRC(3) < 0
* bit5 = SRC(2) < 0
* bit4 = abs(S(2)) > abs(S(3))
* bit3 = SRC(1) < 0
* bit2 = abs(S(1)) > abs(S(3))
* bit1 = SRC(0) < 0
* bit0 = abs(S(0)) > abs(S(3))
*/
SEG_DATA
clip_table:
D_BYTE 0, 1, 0, 2, 4, 5, 4, 6
D_BYTE 0, 1, 0, 2, 8, 9, 8, 10
D_BYTE 32, 33, 32, 34, 36, 37, 36, 38
D_BYTE 32, 33, 32, 34, 40, 41, 40, 42
D_BYTE 0, 1, 0, 2, 4, 5, 4, 6
D_BYTE 0, 1, 0, 2, 8, 9, 8, 10
D_BYTE 16, 17, 16, 18, 20, 21, 20, 22
D_BYTE 16, 17, 16, 18, 24, 25, 24, 26
D_BYTE 63, 61, 63, 62, 55, 53, 55, 54
D_BYTE 63, 61, 63, 62, 59, 57, 59, 58
D_BYTE 47, 45, 47, 46, 39, 37, 39, 38
D_BYTE 47, 45, 47, 46, 43, 41, 43, 42
D_BYTE 63, 61, 63, 62, 55, 53, 55, 54
D_BYTE 63, 61, 63, 62, 59, 57, 59, 58
D_BYTE 31, 29, 31, 30, 23, 21, 23, 22
D_BYTE 31, 29, 31, 30, 27, 25, 27, 26
SEG_TEXT
/*
* gl_x86_cliptest_points4
*
* AL: ormask
* AH: andmask
* EBX: temp0
* ECX: temp1
* EDX: clipmask[]
* ESI: clip[]
* EDI: proj[]
* EBP: temp2
*/
#if defined(__ELF__) && defined(__PIC__) && !defined(ELFPIC)
#define ELFPIC
#endif
ALIGNTEXT16
GLOBL GLNAME( gl_x86_cliptest_points4 )
GLNAME( gl_x86_cliptest_points4 ):
#ifdef ELFPIC
#define FRAME_OFFSET 20
#else
#define FRAME_OFFSET 16
#endif
PUSH_L( ESI )
PUSH_L( EDI )
PUSH_L( EBP )
PUSH_L( EBX )
#ifdef ELFPIC
/* store pointer to clip_table on stack */
CALL( LLBL( ctp4_get_eip ) )
ADD_L( CONST(_GLOBAL_OFFSET_TABLE_), EBX )
MOV_L( REGOFF(clip_table@GOT, EBX), EBX )
PUSH_L( EBX )
JMP( LLBL( ctp4_clip_table_ready ) )
LLBL( ctp4_get_eip ):
/* store eip in ebx */
MOV_L( REGIND(ESP), EBX )
RET
LLBL( ctp4_clip_table_ready ):
#endif
MOV_L( ARG_SOURCE, ESI )
MOV_L( ARG_DEST, EDI )
MOV_L( ARG_CLIP, EDX )
MOV_L( ARG_OR, EBX )
MOV_L( ARG_AND, EBP )
MOV_L( REGOFF(V4F_STRIDE, ESI), EAX )
MOV_L( REGOFF(V4F_COUNT, ESI), ECX )
MOV_L( REGOFF(V4F_START, ESI), ESI )
OR_L( CONST(VEC_SIZE_4), REGOFF(V4F_FLAGS, EDI) )
MOV_L( EAX, ARG_SOURCE ) /* put stride in ARG_SOURCE */
MOV_L( CONST(3), REGOFF(V4F_SIZE, EDI) )
MOV_L( ECX, REGOFF(V4F_COUNT, EDI) )
MOV_L( REGOFF(V4F_START, EDI), EDI )
ADD_L( EDX, ECX )
MOV_L( ECX, ARG_CLIP ) /* put clipmask + count in ARG_CLIP */
CMP_L( ECX, EDX )
MOV_B( REGIND(EBX), AL )
MOV_B( REGIND(EBP), AH )
JZ( LLBL( ctp4_finish ) )
ALIGNTEXT16
LLBL( ctp4_top ):
FLD1 /* F3 */
FDIV_S( SRC(3) )
MOV_L( SRC(3), EBP )
MOV_L( SRC(2), EBX )
XOR_L( ECX, ECX )
ADD_L( EBP, EBP ) /* ebp = abs(S(3))*2 ; carry = sign of S(3) */
ADC_L( ECX, ECX )
ADD_L( EBX, EBX ) /* ebx = abs(S(2))*2 ; carry = sign of S(2) */
ADC_L( ECX, ECX )
CMP_L( EBX, EBP ) /* carry = abs(S(2))*2 > abs(S(3))*2 */
ADC_L( ECX, ECX )
MOV_L( SRC(1), EBX )
ADD_L( EBX, EBX ) /* ebx = abs(S(1))*2 ; carry = sign of S(1) */
ADC_L( ECX, ECX )
CMP_L( EBX, EBP ) /* carry = abs(S(1))*2 > abs(S(3))*2 */
ADC_L( ECX, ECX )
MOV_L( SRC(0), EBX )
ADD_L( EBX, EBX ) /* ebx = abs(S(0))*2 ; carry = sign of S(0) */
ADC_L( ECX, ECX )
CMP_L( EBX, EBP ) /* carry = abs(S(0))*2 > abs(S(3))*2 */
ADC_L( ECX, ECX )
#ifdef ELFPIC
MOV_L( REGIND(ESP), EBP ) /* clip_table */
MOV_B( REGBI(EBP, ECX), CL )
#else
MOV_B( REGOFF(clip_table,ECX), CL )
#endif
OR_B( CL, AL )
AND_B( CL, AH )
TEST_B( CL, CL )
MOV_B( CL, REGIND(EDX) )
JZ( LLBL( ctp4_proj ) )
FSTP( ST(0) ) /* */
JMP( LLBL( ctp4_next ) )
LLBL( ctp4_proj ):
FLD_S( SRC(0) ) /* F0 F3 */
FMUL2( ST(1), ST(0) )
FLD_S( SRC(1) ) /* F1 F0 F3 */
FMUL2( ST(2), ST(0) )
FLD_S( SRC(2) ) /* F2 F1 F0 F3 */
FMUL2( ST(3), ST(0) )
FXCH( ST(2) ) /* F0 F1 F2 F3 */
FSTP_S( DST(0) ) /* F1 F2 F3 */
FSTP_S( DST(1) ) /* F2 F3 */
FSTP_S( DST(2) ) /* F3 */
FSTP_S( DST(3) ) /* */
LLBL( ctp4_next ):
INC_L( EDX )
ADD_L( CONST(16), EDI )
ADD_L( ARG_SOURCE, ESI )
CMP_L( EDX, ARG_CLIP )
JNZ( LLBL( ctp4_top ) )
MOV_L( ARG_OR, ECX )
MOV_L( ARG_AND, EDX )
MOV_B( AL, REGIND(ECX) )
MOV_B( AH, REGIND(EDX) )
LLBL( ctp4_finish ):
MOV_L( ARG_DEST, EAX )
#ifdef ELFPIC
POP_L( ESI ) /* discard ptr to clip_table */
#endif
POP_L( EBX )
POP_L( EBP )
POP_L( EDI )
POP_L( ESI )
RET
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