1 /* 2 Copyright (C) 1996-1997 Id Software, Inc. 3 4 This program is free software; you can redistribute it and/or 5 modify it under the terms of the GNU General Public License 6 as published by the Free Software Foundation; either version 2 7 of the License, or (at your option) any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 12 13 See the GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software 17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 19 */ 20 // 21 // worlda.s 22 // x86 assembly-language server testing stuff 23 // 24 25 #define GLQUAKE 1 // don't include unneeded defs 26 #include "asm_i386.h" 27 #include "quakeasm.h" 28 #include "d_ifacea.h" 29 30 #if id386 31 32 .data 33 34 Ltemp: .long 0 35 36 .text 37 38 //---------------------------------------------------------------------- 39 // hull-point test 40 //---------------------------------------------------------------------- 41 42 #define hull 4+8 // because only partially pushed 43 #define num 8+4 // because only partially pushed 44 #define p 12+12 // because only partially pushed 45 46 .align 4 47 .globl C(SV_HullPointContents) 48 C(SV_HullPointContents): 49 pushl %edi // preserve register variables 50 movl num(%esp),%eax 51 testl %eax,%eax 52 js Lhquickout 53 54 // float d; 55 // dclipnode_t *node; 56 // mplane_t *plane; 57 58 pushl %ebx 59 movl hull(%esp),%ebx 60 61 pushl %ebp 62 movl p(%esp),%edx 63 64 movl hu_clipnodes(%ebx),%edi 65 movl hu_planes(%ebx),%ebp 66 67 subl %ebx,%ebx 68 pushl %esi 69 70 // %ebx: 0 71 // %eax: num 72 // %edx: p 73 // %edi: hull->clipnodes 74 // %ebp: hull->planes 75 76 // while (num >= 0) 77 // { 78 79 Lhloop: 80 81 // node = hull->clipnodes + num; 82 // plane = hull->planes + node->planenum; 83 // !!! if the size of dclipnode_t changes, the scaling of %eax needs to be 84 // changed !!! 85 movl nd_planenum(%edi,%eax,8),%ecx 86 movl nd_children(%edi,%eax,8),%eax 87 movl %eax,%esi 88 rorl $16,%eax 89 leal (%ecx,%ecx,4),%ecx 90 91 // if (plane->type < 3) 92 // d = p[plane->type] - plane->dist; 93 movb pl_type(%ebp,%ecx,4),%bl 94 cmpb $3,%bl 95 jb Lnodot 96 97 // else 98 // d = DotProduct (plane->normal, p) - plane->dist; 99 flds pl_normal(%ebp,%ecx,4) 100 fmuls 0(%edx) 101 flds pl_normal+4(%ebp,%ecx,4) 102 fmuls 4(%edx) 103 flds pl_normal+8(%ebp,%ecx,4) 104 fmuls 8(%edx) 105 fxch %st(1) 106 faddp %st(0),%st(2) 107 faddp %st(0),%st(1) 108 fsubs pl_dist(%ebp,%ecx,4) 109 jmp Lsub 110 111 Lnodot: 112 flds pl_dist(%ebp,%ecx,4) 113 fsubrs (%edx,%ebx,4) 114 115 Lsub: 116 sarl $16,%eax 117 sarl $16,%esi 118 119 // if (d < 0) 120 // num = node->children[1]; 121 // else 122 // num = node->children[0]; 123 fstps Ltemp 124 movl Ltemp,%ecx 125 sarl $31,%ecx 126 andl %ecx,%esi 127 xorl $0xFFFFFFFF,%ecx 128 andl %ecx,%eax 129 orl %esi,%eax 130 jns Lhloop 131 132 // return num; 133 Lhdone: 134 popl %esi 135 popl %ebp 136 popl %ebx // restore register variables 137 138 Lhquickout: 139 popl %edi 140 141 ret 142 143 #endif // id386 144 145
