Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5131 | clevermous | 1 | /* |
| 2 | Copyright (C) 1996-1997 Id Software, Inc. |
||
| 3 | |||
| 4 | This program is free software; you can redistribute it and/or |
||
| 5 | modify it under the terms of the GNU General Public License |
||
| 6 | as published by the Free Software Foundation; either version 2 |
||
| 7 | of the License, or (at your option) any later version. |
||
| 8 | |||
| 9 | This program is distributed in the hope that it will be useful, |
||
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
||
| 12 | |||
| 13 | See the GNU General Public License for more details. |
||
| 14 | |||
| 15 | You should have received a copy of the GNU General Public License |
||
| 16 | along with this program; if not, write to the Free Software |
||
| 17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
||
| 18 | |||
| 19 | */ |
||
| 20 | // |
||
| 21 | // d_scana.s |
||
| 22 | // x86 assembly-language turbulent texture mapping code |
||
| 23 | // |
||
| 24 | |||
| 25 | #include "asm_i386.h" |
||
| 26 | #include "quakeasm.h" |
||
| 27 | #include "asm_draw.h" |
||
| 28 | #include "d_ifacea.h" |
||
| 29 | |||
| 30 | #if id386 |
||
| 31 | |||
| 32 | .data |
||
| 33 | |||
| 34 | .text |
||
| 35 | |||
| 36 | //---------------------------------------------------------------------- |
||
| 37 | // turbulent texture mapping code |
||
| 38 | //---------------------------------------------------------------------- |
||
| 39 | |||
| 40 | .align 4 |
||
| 41 | .globl C(D_DrawTurbulent8Span) |
||
| 42 | C(D_DrawTurbulent8Span): |
||
| 43 | pushl %ebp // preserve caller's stack frame pointer |
||
| 44 | pushl %esi // preserve register variables |
||
| 45 | pushl %edi |
||
| 46 | pushl %ebx |
||
| 47 | |||
| 48 | movl C(r_turb_s),%esi |
||
| 49 | movl C(r_turb_t),%ecx |
||
| 50 | movl C(r_turb_pdest),%edi |
||
| 51 | movl C(r_turb_spancount),%ebx |
||
| 52 | |||
| 53 | Llp: |
||
| 54 | movl %ecx,%eax |
||
| 55 | movl %esi,%edx |
||
| 56 | sarl $16,%eax |
||
| 57 | movl C(r_turb_turb),%ebp |
||
| 58 | sarl $16,%edx |
||
| 59 | andl $(CYCLE-1),%eax |
||
| 60 | andl $(CYCLE-1),%edx |
||
| 61 | movl (%ebp,%eax,4),%eax |
||
| 62 | movl (%ebp,%edx,4),%edx |
||
| 63 | addl %esi,%eax |
||
| 64 | sarl $16,%eax |
||
| 65 | addl %ecx,%edx |
||
| 66 | sarl $16,%edx |
||
| 67 | andl $(TURB_TEX_SIZE-1),%eax |
||
| 68 | andl $(TURB_TEX_SIZE-1),%edx |
||
| 69 | shll $6,%edx |
||
| 70 | movl C(r_turb_pbase),%ebp |
||
| 71 | addl %eax,%edx |
||
| 72 | incl %edi |
||
| 73 | addl C(r_turb_sstep),%esi |
||
| 74 | addl C(r_turb_tstep),%ecx |
||
| 75 | movb (%ebp,%edx,1),%dl |
||
| 76 | decl %ebx |
||
| 77 | movb %dl,-1(%edi) |
||
| 78 | jnz Llp |
||
| 79 | |||
| 80 | movl %edi,C(r_turb_pdest) |
||
| 81 | |||
| 82 | popl %ebx // restore register variables |
||
| 83 | popl %edi |
||
| 84 | popl %esi |
||
| 85 | popl %ebp // restore caller's stack frame pointer |
||
| 86 | ret |
||
| 87 | |||
| 88 | #endif // id386 |
||
| 89 |