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1.1 root 1: //
2: // worlda.s
3: // x86 assembly-language server testing stuff
4: //
5:
1.1.1.2 ! root 6: #define GLQUAKE 1 // don't include unneeded defs
1.1 root 7: #include "asm_i386.h"
8: #include "quakeasm.h"
9: #include "d_ifacea.h"
10:
11: #if id386
12:
13: .data
14:
15: Ltemp: .long 0
16:
17: .text
18:
19: //----------------------------------------------------------------------
20: // hull-point test
21: //----------------------------------------------------------------------
22:
23: #define hull 4+8 // because only partially pushed
24: #define num 8+4 // because only partially pushed
25: #define p 12+12 // because only partially pushed
26:
27: .align 4
28: .globl C(SV_HullPointContents)
29: C(SV_HullPointContents):
30: pushl %edi // preserve register variables
31: movl num(%esp),%eax
32: testl %eax,%eax
33: js Lhquickout
34:
35: // float d;
36: // dclipnode_t *node;
37: // mplane_t *plane;
38:
39: pushl %ebx
40: movl hull(%esp),%ebx
41:
42: pushl %ebp
43: movl p(%esp),%edx
44:
45: movl hu_clipnodes(%ebx),%edi
46: movl hu_planes(%ebx),%ebp
47:
48: subl %ebx,%ebx
49: pushl %esi
50:
51: // %ebx: 0
52: // %eax: num
53: // %edx: p
54: // %edi: hull->clipnodes
55: // %ebp: hull->planes
56:
57: // while (num >= 0)
58: // {
59:
60: Lhloop:
61:
62: // node = hull->clipnodes + num;
63: // plane = hull->planes + node->planenum;
64: // !!! if the size of dclipnode_t changes, the scaling of %eax needs to be
65: // changed !!!
66: movl nd_planenum(%edi,%eax,8),%ecx
67: movl nd_children(%edi,%eax,8),%eax
68: movl %eax,%esi
69: rorl $16,%eax
70: leal (%ecx,%ecx,4),%ecx
71:
72: // if (plane->type < 3)
73: // d = p[plane->type] - plane->dist;
74: movb pl_type(%ebp,%ecx,4),%bl
75: cmpb $3,%bl
76: jb Lnodot
77:
78: // else
79: // d = DotProduct (plane->normal, p) - plane->dist;
80: flds pl_normal(%ebp,%ecx,4)
81: fmuls 0(%edx)
82: flds pl_normal+4(%ebp,%ecx,4)
83: fmuls 4(%edx)
84: flds pl_normal+8(%ebp,%ecx,4)
85: fmuls 8(%edx)
86: fxch %st(1)
87: faddp %st(0),%st(2)
88: faddp %st(0),%st(1)
89: fsubs pl_dist(%ebp,%ecx,4)
90: jmp Lsub
91:
92: Lnodot:
93: flds pl_dist(%ebp,%ecx,4)
94: fsubrs (%edx,%ebx,4)
95:
96: Lsub:
97: sarl $16,%eax
98: sarl $16,%esi
99:
100: // if (d < 0)
101: // num = node->children[1];
102: // else
103: // num = node->children[0];
104: fstps Ltemp
105: movl Ltemp,%ecx
106: sarl $31,%ecx
107: andl %ecx,%esi
108: xorl $0xFFFFFFFF,%ecx
109: andl %ecx,%eax
110: orl %esi,%eax
111: jns Lhloop
112:
113: // return num;
114: Lhdone:
115: popl %esi
116: popl %ebp
117: popl %ebx // restore register variables
118:
119: Lhquickout:
120: popl %edi
121:
122: ret
123:
124: #endif // id386
125:
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