| 0,0 → 1,89 |
|---|
| /* |
| Copyright (C) 1996-1997 Id Software, Inc. |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License |
| as published by the Free Software Foundation; either version 2 |
| of the License, or (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| |
| See the GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| |
| */ |
| // |
| // d_scana.s |
| // x86 assembly-language turbulent texture mapping code |
| // |
| |
| #include "asm_i386.h" |
| #include "quakeasm.h" |
| #include "asm_draw.h" |
| #include "d_ifacea.h" |
| |
| #if id386 |
| |
| .data |
| |
| .text |
| |
| //---------------------------------------------------------------------- |
| // turbulent texture mapping code |
| //---------------------------------------------------------------------- |
| |
| .align 4 |
| .globl C(D_DrawTurbulent8Span) |
| C(D_DrawTurbulent8Span): |
| pushl %ebp // preserve caller's stack frame pointer |
| pushl %esi // preserve register variables |
| pushl %edi |
| pushl %ebx |
| |
| movl C(r_turb_s),%esi |
| movl C(r_turb_t),%ecx |
| movl C(r_turb_pdest),%edi |
| movl C(r_turb_spancount),%ebx |
| |
| Llp: |
| movl %ecx,%eax |
| movl %esi,%edx |
| sarl $16,%eax |
| movl C(r_turb_turb),%ebp |
| sarl $16,%edx |
| andl $(CYCLE-1),%eax |
| andl $(CYCLE-1),%edx |
| movl (%ebp,%eax,4),%eax |
| movl (%ebp,%edx,4),%edx |
| addl %esi,%eax |
| sarl $16,%eax |
| addl %ecx,%edx |
| sarl $16,%edx |
| andl $(TURB_TEX_SIZE-1),%eax |
| andl $(TURB_TEX_SIZE-1),%edx |
| shll $6,%edx |
| movl C(r_turb_pbase),%ebp |
| addl %eax,%edx |
| incl %edi |
| addl C(r_turb_sstep),%esi |
| addl C(r_turb_tstep),%ecx |
| movb (%ebp,%edx,1),%dl |
| decl %ebx |
| movb %dl,-1(%edi) |
| jnz Llp |
| |
| movl %edi,C(r_turb_pdest) |
| |
| popl %ebx // restore register variables |
| popl %edi |
| popl %esi |
| popl %ebp // restore caller's stack frame pointer |
| ret |
| |
| #endif // id386 |
| |