2001-12-22 04:27:19 +00:00
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//
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// d_scana.s
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// x86 assembly-language turbulent texture mapping code
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//
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2002-03-05 10:04:05 +00:00
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#include "../src/qasm.h"
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2001-12-22 04:27:19 +00:00
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#include "d_ifacea.h"
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#if id386
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.data
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.text
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//----------------------------------------------------------------------
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// turbulent texture mapping code
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//----------------------------------------------------------------------
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.align 4
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.globl C(D_DrawTurbulent8Span)
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C(D_DrawTurbulent8Span):
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pushl %ebp // preserve caller's stack frame pointer
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pushl %esi // preserve register variables
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pushl %edi
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pushl %ebx
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movl C(r_turb_s),%esi
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movl C(r_turb_t),%ecx
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movl C(r_turb_pdest),%edi
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movl C(r_turb_spancount),%ebx
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Llp:
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movl %ecx,%eax
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movl %esi,%edx
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sarl $16,%eax
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movl C(r_turb_turb),%ebp
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sarl $16,%edx
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andl $(CYCLE-1),%eax
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andl $(CYCLE-1),%edx
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movl (%ebp,%eax,4),%eax
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movl (%ebp,%edx,4),%edx
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addl %esi,%eax
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sarl $16,%eax
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addl %ecx,%edx
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sarl $16,%edx
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andl $(TURB_TEX_SIZE-1),%eax
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andl $(TURB_TEX_SIZE-1),%edx
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shll $6,%edx
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movl C(r_turb_pbase),%ebp
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addl %eax,%edx
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incl %edi
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addl C(r_turb_sstep),%esi
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addl C(r_turb_tstep),%ecx
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movb (%ebp,%edx,1),%dl
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decl %ebx
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movb %dl,-1(%edi)
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jnz Llp
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movl %edi,C(r_turb_pdest)
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popl %ebx // restore register variables
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popl %edi
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popl %esi
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popl %ebp // restore caller's stack frame pointer
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ret
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#endif // id386
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