mirror of
https://git.code.sf.net/p/quake/quake2forge
synced 2024-12-14 06:31:20 +00:00
68 lines
1.3 KiB
ArmAsm
68 lines
1.3 KiB
ArmAsm
//
|
|
// d_scana.s
|
|
// x86 assembly-language turbulent texture mapping code
|
|
//
|
|
|
|
#include "qasm.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
|
|
|