| /*
|
| 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 |
