1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/*
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 1999,2000 contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors
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
|
