diff options
Diffstat (limited to 'WinQuake/d_scana.s')
| -rw-r--r-- | WinQuake/d_scana.s | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/WinQuake/d_scana.s b/WinQuake/d_scana.s new file mode 100644 index 0000000..bd4fd74 --- /dev/null +++ b/WinQuake/d_scana.s @@ -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 + |