diff options
Diffstat (limited to 'QW/client/surf16.s')
| -rw-r--r-- | QW/client/surf16.s | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/QW/client/surf16.s b/QW/client/surf16.s new file mode 100644 index 0000000..c0812a3 --- /dev/null +++ b/QW/client/surf16.s @@ -0,0 +1,172 @@ +/* +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. + +*/ +// +// surf16.s +// x86 assembly-language 16 bpp surface block drawing code. +// + +#include "asm_i386.h" +#include "quakeasm.h" +#include "asm_draw.h" + +#if id386 + +//---------------------------------------------------------------------- +// Surface block drawer +//---------------------------------------------------------------------- + + .data + +k: .long 0 +loopentry: .long 0 + + .align 4 +blockjumptable16: + .long LEnter2_16 + .long LEnter4_16 + .long 0, LEnter8_16 + .long 0, 0, 0, LEnter16_16 + + + .text + + .align 4 +.globl C(R_Surf16Start) +C(R_Surf16Start): + + .align 4 +.globl C(R_DrawSurfaceBlock16) +C(R_DrawSurfaceBlock16): + pushl %ebp // preserve caller's stack frame + pushl %edi + pushl %esi // preserve register variables + pushl %ebx + + movl C(blocksize),%eax + movl C(prowdestbase),%edi + movl C(pbasesource),%esi + movl C(sourcesstep),%ebx + movl blockjumptable16-4(,%eax,2),%ecx + movl %eax,k + movl %ecx,loopentry + movl C(lightleft),%edx + movl C(lightright),%ebp + +Lblockloop16: + + subl %edx,%ebp + movb C(blockdivshift),%cl + sarl %cl,%ebp + jns Lp1_16 + testl C(blockdivmask),%ebp + jz Lp1_16 + incl %ebp +Lp1_16: + + subl %eax,%eax + subl %ecx,%ecx // high words must be 0 in loop for addressing + + jmp *loopentry + + .align 4 + +#include "block16.h" + + movl C(pbasesource),%esi + movl C(lightleft),%edx + movl C(lightright),%ebp + movl C(sourcetstep),%eax + movl C(lightrightstep),%ecx + movl C(prowdestbase),%edi + + addl %eax,%esi + addl %ecx,%ebp + + movl C(lightleftstep),%eax + movl C(surfrowbytes),%ecx + + addl %eax,%edx + addl %ecx,%edi + + movl %esi,C(pbasesource) + movl %ebp,C(lightright) + movl k,%eax + movl %edx,C(lightleft) + decl %eax + movl %edi,C(prowdestbase) + movl %eax,k + jnz Lblockloop16 + + popl %ebx // restore register variables + popl %esi + popl %edi + popl %ebp // restore the caller's stack frame + ret + +.globl C(R_Surf16End) +C(R_Surf16End): + +//---------------------------------------------------------------------- +// Code patching routines +//---------------------------------------------------------------------- + .data + + .align 4 +LPatchTable16: + .long LBPatch0-4 + .long LBPatch1-4 + .long LBPatch2-4 + .long LBPatch3-4 + .long LBPatch4-4 + .long LBPatch5-4 + .long LBPatch6-4 + .long LBPatch7-4 + .long LBPatch8-4 + .long LBPatch9-4 + .long LBPatch10-4 + .long LBPatch11-4 + .long LBPatch12-4 + .long LBPatch13-4 + .long LBPatch14-4 + .long LBPatch15-4 + + .text + + .align 4 +.globl C(R_Surf16Patch) +C(R_Surf16Patch): + pushl %ebx + + movl C(colormap),%eax + movl $LPatchTable16,%ebx + movl $16,%ecx +LPatchLoop16: + movl (%ebx),%edx + addl $4,%ebx + movl %eax,(%edx) + decl %ecx + jnz LPatchLoop16 + + popl %ebx + + ret + + +#endif // id386 |