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1.1 root 1: //
2: // surf8.s
3: // x86 assembly-language 8 bpp surface block drawing code.
4: //
5:
6: #include "asm_i386.h"
7: #include "quakeasm.h"
8: #include "asm_draw.h"
9:
10: #if id386
11:
12: //----------------------------------------------------------------------
13: // Surface block drawer
14: //----------------------------------------------------------------------
15:
16: .data
17:
18: k: .long 0
19: loopentry: .long 0
20:
21: .align 4
22: blockjumptable16:
23: .long LEnter2_16
24: .long LEnter4_16
25: .long 0, LEnter8_16
26: .long 0, 0, 0, LEnter16_16
27:
28:
29: .text
30:
31: .align 4
32: .globl C(R_Surf16Start)
33: C(R_Surf16Start):
34:
35: .align 4
36: .globl C(R_DrawSurfaceBlock16)
37: C(R_DrawSurfaceBlock16):
38: pushl %ebp // preserve caller's stack frame
39: pushl %edi
40: pushl %esi // preserve register variables
41: pushl %ebx
42:
43: movl C(blocksize),%eax
44: movl C(prowdestbase),%edi
45: movl C(pbasesource),%esi
46: movl C(sourcesstep),%ebx
47: movl blockjumptable16-4(,%eax,2),%ecx
48: movl %eax,k
49: movl %ecx,loopentry
50: movl C(lightleft),%edx
51: movl C(lightright),%ebp
52:
53: Lblockloop16:
54:
55: subl %edx,%ebp
56: movb C(blockdivshift),%cl
57: sarl %cl,%ebp
58: jns Lp1_16
59: testl C(blockdivmask),%ebp
60: jz Lp1_16
61: incl %ebp
62: Lp1_16:
63:
64: subl %eax,%eax
65: subl %ecx,%ecx // high words must be 0 in loop for addressing
66:
67: jmp *loopentry
68:
69: .align 4
70:
71: #include "block16.h"
72:
73: movl C(pbasesource),%esi
74: movl C(lightleft),%edx
75: movl C(lightright),%ebp
76: movl C(sourcetstep),%eax
77: movl C(lightrightstep),%ecx
78: movl C(prowdestbase),%edi
79:
80: addl %eax,%esi
81: addl %ecx,%ebp
82:
83: movl C(lightleftstep),%eax
84: movl C(surfrowbytes),%ecx
85:
86: addl %eax,%edx
87: addl %ecx,%edi
88:
89: movl %esi,C(pbasesource)
90: movl %ebp,C(lightright)
91: movl k,%eax
92: movl %edx,C(lightleft)
93: decl %eax
94: movl %edi,C(prowdestbase)
95: movl %eax,k
96: jnz Lblockloop16
97:
98: popl %ebx // restore register variables
99: popl %esi
100: popl %edi
101: popl %ebp // restore the caller's stack frame
102: ret
103:
104: .globl C(R_Surf16End)
105: C(R_Surf16End):
106:
107: //----------------------------------------------------------------------
108: // Code patching routines
109: //----------------------------------------------------------------------
110: .data
111:
112: .align 4
113: LPatchTable16:
114: .long LBPatch0 - 4
115: .long LBPatch1 - 4
116: .long LBPatch2 - 4
117: .long LBPatch3 - 4
118: .long LBPatch4 - 4
119: .long LBPatch5 - 4
120: .long LBPatch6 - 4
121: .long LBPatch7 - 4
122: .long LBPatch8 - 4
123: .long LBPatch9 - 4
124: .long LBPatch10 - 4
125: .long LBPatch11 - 4
126: .long LBPatch12 - 4
127: .long LBPatch13 - 4
128: .long LBPatch14 - 4
129: .long LBPatch15 - 4
130:
131: .align 4
132: .globl C(R_Surf16Patch)
133: C(R_Surf16Patch):
134: pushl %ebx
135:
136: movl C(colormap),%eax
137: movl $LPatchTable16,%ebx
138: movl $16,%ecx
139: LPatchLoop16:
140: movl (%ebx),%edx
141: addl $4,%ebx
142: movl %eax,(%edx)
143: decl %ecx
144: jnz LPatchLoop16
145:
146: popl %ebx
147:
148: ret
149:
150:
151: #endif // id386
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