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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 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 | // surf16.s |
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| 22 | // x86 assembly-language 16 bpp surface block drawing code. |
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| 23 | // |
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| 24 | |||
| 25 | #include "asm_i386.h" |
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| 26 | #include "quakeasm.h" |
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| 27 | #include "asm_draw.h" |
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| 28 | |||
| 29 | #if id386 |
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| 30 | |||
| 31 | //---------------------------------------------------------------------- |
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| 32 | // Surface block drawer |
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| 33 | //---------------------------------------------------------------------- |
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| 34 | |||
| 35 | .data |
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| 36 | |||
| 37 | k: .long 0 |
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| 38 | loopentry: .long 0 |
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| 39 | |||
| 40 | .align 4 |
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| 41 | blockjumptable16: |
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| 42 | .long LEnter2_16 |
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| 43 | .long LEnter4_16 |
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| 44 | .long 0, LEnter8_16 |
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| 45 | .long 0, 0, 0, LEnter16_16 |
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| 46 | |||
| 47 | |||
| 48 | .text |
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| 49 | |||
| 50 | .align 4 |
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| 51 | .globl C(R_Surf16Start) |
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| 52 | C(R_Surf16Start): |
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| 53 | |||
| 54 | .align 4 |
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| 55 | .globl C(R_DrawSurfaceBlock16) |
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| 56 | C(R_DrawSurfaceBlock16): |
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| 57 | pushl %ebp // preserve caller's stack frame |
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| 58 | pushl %edi |
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| 59 | pushl %esi // preserve register variables |
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| 60 | pushl %ebx |
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| 61 | |||
| 62 | movl C(blocksize),%eax |
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| 63 | movl C(prowdestbase),%edi |
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| 64 | movl C(pbasesource),%esi |
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| 65 | movl C(sourcesstep),%ebx |
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| 66 | movl blockjumptable16-4(,%eax,2),%ecx |
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| 67 | movl %eax,k |
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| 68 | movl %ecx,loopentry |
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| 69 | movl C(lightleft),%edx |
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| 70 | movl C(lightright),%ebp |
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| 71 | |||
| 72 | Lblockloop16: |
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| 73 | |||
| 74 | subl %edx,%ebp |
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| 75 | movb C(blockdivshift),%cl |
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| 76 | sarl %cl,%ebp |
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| 77 | jns Lp1_16 |
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| 78 | testl C(blockdivmask),%ebp |
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| 79 | jz Lp1_16 |
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| 80 | incl %ebp |
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| 81 | Lp1_16: |
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| 82 | |||
| 83 | subl %eax,%eax |
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| 84 | subl %ecx,%ecx // high words must be 0 in loop for addressing |
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| 85 | |||
| 86 | jmp *loopentry |
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| 87 | |||
| 88 | .align 4 |
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| 89 | |||
| 90 | #include "block16.h" |
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| 91 | |||
| 92 | movl C(pbasesource),%esi |
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| 93 | movl C(lightleft),%edx |
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| 94 | movl C(lightright),%ebp |
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| 95 | movl C(sourcetstep),%eax |
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| 96 | movl C(lightrightstep),%ecx |
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| 97 | movl C(prowdestbase),%edi |
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| 98 | |||
| 99 | addl %eax,%esi |
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| 100 | addl %ecx,%ebp |
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| 101 | |||
| 102 | movl C(lightleftstep),%eax |
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| 103 | movl C(surfrowbytes),%ecx |
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| 104 | |||
| 105 | addl %eax,%edx |
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| 106 | addl %ecx,%edi |
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| 107 | |||
| 108 | movl %esi,C(pbasesource) |
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| 109 | movl %ebp,C(lightright) |
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| 110 | movl k,%eax |
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| 111 | movl %edx,C(lightleft) |
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| 112 | decl %eax |
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| 113 | movl %edi,C(prowdestbase) |
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| 114 | movl %eax,k |
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| 115 | jnz Lblockloop16 |
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| 116 | |||
| 117 | popl %ebx // restore register variables |
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| 118 | popl %esi |
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| 119 | popl %edi |
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| 120 | popl %ebp // restore the caller's stack frame |
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| 121 | ret |
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| 122 | |||
| 123 | .globl C(R_Surf16End) |
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| 124 | C(R_Surf16End): |
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| 125 | |||
| 126 | //---------------------------------------------------------------------- |
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| 127 | // Code patching routines |
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| 128 | //---------------------------------------------------------------------- |
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| 129 | .data |
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| 130 | |||
| 131 | .align 4 |
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| 132 | LPatchTable16: |
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| 133 | .long LBPatch0-4 |
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| 134 | .long LBPatch1-4 |
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| 135 | .long LBPatch2-4 |
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| 136 | .long LBPatch3-4 |
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| 137 | .long LBPatch4-4 |
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| 138 | .long LBPatch5-4 |
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| 139 | .long LBPatch6-4 |
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| 140 | .long LBPatch7-4 |
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| 141 | .long LBPatch8-4 |
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| 142 | .long LBPatch9-4 |
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| 143 | .long LBPatch10-4 |
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| 144 | .long LBPatch11-4 |
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| 145 | .long LBPatch12-4 |
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| 146 | .long LBPatch13-4 |
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| 147 | .long LBPatch14-4 |
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| 148 | .long LBPatch15-4 |
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| 149 | |||
| 150 | .text |
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| 151 | |||
| 152 | .align 4 |
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| 153 | .globl C(R_Surf16Patch) |
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| 154 | C(R_Surf16Patch): |
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| 155 | pushl %ebx |
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| 156 | |||
| 157 | movl C(colormap),%eax |
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| 158 | movl $LPatchTable16,%ebx |
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| 159 | movl $16,%ecx |
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| 160 | LPatchLoop16: |
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| 161 | movl (%ebx),%edx |
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| 162 | addl $4,%ebx |
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| 163 | movl %eax,(%edx) |
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| 164 | decl %ecx |
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| 165 | jnz LPatchLoop16 |
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| 166 | |||
| 167 | popl %ebx |
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| 168 | |||
| 169 | ret |
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| 170 | |||
| 171 | |||
| 172 | #endif // id386 |