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5131 | clevermous | 1 | /* |
2 | Copyright (C) 1996-1997 Id Software, Inc. |
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3 | |||
4 | This program is free software; you can redistribute it and/or |
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5 | modify it under the terms of the GNU General Public License |
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6 | as published by the Free Software Foundation; either version 2 |
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7 | of the License, or (at your option) any later version. |
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8 | |||
9 | This program is distributed in the hope that it will be useful, |
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10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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12 | |||
13 | See the GNU General Public License for more details. |
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14 | |||
15 | You should have received a copy of the GNU General Public License |
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16 | along with this program; if not, write to the Free Software |
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17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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18 | |||
19 | */ |
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20 | // |
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21 | // worlda.s |
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22 | // x86 assembly-language server testing stuff |
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23 | // |
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24 | |||
25 | #define GLQUAKE 1 // don't include unneeded defs |
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26 | #include "asm_i386.h" |
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27 | #include "quakeasm.h" |
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28 | #include "d_ifacea.h" |
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29 | |||
30 | #if id386 |
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31 | |||
32 | .data |
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33 | |||
34 | Ltemp: .long 0 |
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35 | |||
36 | .text |
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37 | |||
38 | //---------------------------------------------------------------------- |
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39 | // hull-point test |
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40 | //---------------------------------------------------------------------- |
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41 | |||
42 | #define hull 4+8 // because only partially pushed |
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43 | #define num 8+4 // because only partially pushed |
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44 | #define p 12+12 // because only partially pushed |
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45 | |||
46 | .align 4 |
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47 | .globl C(SV_HullPointContents) |
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48 | C(SV_HullPointContents): |
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49 | pushl %edi // preserve register variables |
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50 | movl num(%esp),%eax |
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51 | testl %eax,%eax |
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52 | js Lhquickout |
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53 | |||
54 | // float d; |
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55 | // dclipnode_t *node; |
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56 | // mplane_t *plane; |
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57 | |||
58 | pushl %ebx |
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59 | movl hull(%esp),%ebx |
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60 | |||
61 | pushl %ebp |
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62 | movl p(%esp),%edx |
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63 | |||
64 | movl hu_clipnodes(%ebx),%edi |
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65 | movl hu_planes(%ebx),%ebp |
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66 | |||
67 | subl %ebx,%ebx |
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68 | pushl %esi |
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69 | |||
70 | // %ebx: 0 |
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71 | // %eax: num |
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72 | // %edx: p |
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73 | // %edi: hull->clipnodes |
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74 | // %ebp: hull->planes |
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75 | |||
76 | // while (num >= 0) |
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77 | // { |
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78 | |||
79 | Lhloop: |
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80 | |||
81 | // node = hull->clipnodes + num; |
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82 | // plane = hull->planes + node->planenum; |
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83 | // !!! if the size of dclipnode_t changes, the scaling of %eax needs to be |
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84 | // changed !!! |
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85 | movl nd_planenum(%edi,%eax,8),%ecx |
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86 | movl nd_children(%edi,%eax,8),%eax |
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87 | movl %eax,%esi |
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88 | rorl $16,%eax |
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89 | leal (%ecx,%ecx,4),%ecx |
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90 | |||
91 | // if (plane->type < 3) |
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92 | // d = p[plane->type] - plane->dist; |
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93 | movb pl_type(%ebp,%ecx,4),%bl |
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94 | cmpb $3,%bl |
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95 | jb Lnodot |
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96 | |||
97 | // else |
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98 | // d = DotProduct (plane->normal, p) - plane->dist; |
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99 | flds pl_normal(%ebp,%ecx,4) |
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100 | fmuls 0(%edx) |
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101 | flds pl_normal+4(%ebp,%ecx,4) |
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102 | fmuls 4(%edx) |
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103 | flds pl_normal+8(%ebp,%ecx,4) |
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104 | fmuls 8(%edx) |
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105 | fxch %st(1) |
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106 | faddp %st(0),%st(2) |
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107 | faddp %st(0),%st(1) |
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108 | fsubs pl_dist(%ebp,%ecx,4) |
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109 | jmp Lsub |
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110 | |||
111 | Lnodot: |
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112 | flds pl_dist(%ebp,%ecx,4) |
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113 | fsubrs (%edx,%ebx,4) |
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114 | |||
115 | Lsub: |
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116 | sarl $16,%eax |
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117 | sarl $16,%esi |
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118 | |||
119 | // if (d < 0) |
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120 | // num = node->children[1]; |
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121 | // else |
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122 | // num = node->children[0]; |
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123 | fstps Ltemp |
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124 | movl Ltemp,%ecx |
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125 | sarl $31,%ecx |
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126 | andl %ecx,%esi |
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127 | xorl $0xFFFFFFFF,%ecx |
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128 | andl %ecx,%eax |
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129 | orl %esi,%eax |
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130 | jns Lhloop |
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131 | |||
132 | // return num; |
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133 | Lhdone: |
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134 | popl %esi |
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135 | popl %ebp |
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136 | popl %ebx // restore register variables |
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137 | |||
138 | Lhquickout: |
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139 | popl %edi |
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140 | |||
141 | ret |
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142 | |||
143 | #endif // id386>> |
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144 |