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Endian support for vga tables.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@651
This commit is contained in:
Sjoerd van der Berg 2003-01-25 00:01:40 +00:00
parent b7088bb6e6
commit 4b9c02ea28
1 changed files with 27 additions and 7 deletions
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34
src/hardware/vga.cpp
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@ -27,17 +27,12 @@
#include "vga.h"
VGA_Type vga;
Bit32u CGAWriteTable[256];
Bit32u ExpandTable[256];
Bit32u Expand16Table[4][16];
Bit32u Expand16BigTable[0x10000];
Bit32u FillTable[16]={
0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
0xffff0000,0xffff00ff,0xffffff00,0xffffffff
};
Bit32u FillTable[16];
static void EndRetrace(void) {
/* start the actual display update now */
@ -254,15 +249,40 @@ void VGA_Init(Section* sec) {
Bitu i,j;
for (i=0;i<256;i++) {
ExpandTable[i]=i | (i << 8)| (i <<16) | (i << 24);
#ifdef WORDS_BIGENDIAN
CGAWriteTable[i]=((i>>0)&3) | (((i>>2)&3) << 8)| (((i>>4)&3) <<16) | (((i>>6)&3) << 24);
#else
CGAWriteTable[i]=((i>>6)&3) | (((i>>4)&3) << 8)| (((i>>2)&3) <<16) | (((i>>0)&3) << 24);
#endif
}
for (i=0;i<16;i++) {
#ifdef WORDS_BIGENDIAN
FillTable[i]= ((i & 1) ? 0xff000000 : 0) |
((i & 2) ? 0x00ff0000 : 0) |
((i & 4) ? 0x0000ff00 : 0) |
((i & 8) ? 0x000000ff : 0) ;
#else
FillTable[i]= ((i & 1) ? 0x000000ff : 0) |
((i & 2) ? 0x0000ff00 : 0) |
((i & 4) ? 0x00ff0000 : 0) |
((i & 8) ? 0xff000000 : 0) ;
#endif
}
for (j=0;j<4;j++) {
for (i=0;i<16;i++) {
#ifdef WORDS_BIGENDIAN
Expand16Table[j][i] =
((i & 1) ? 1 << j : 0) |
((i & 2) ? 1 << (8 + j) : 0) |
((i & 4) ? 1 << (16 + j) : 0) |
((i & 8) ? 1 << (24 + j) : 0);
#else
Expand16Table[j][i] =
((i & 1) ? 1 << (24 + j) : 0) |
((i & 2) ? 1 << (16 + j) : 0) |
((i & 4) ? 1 << (8 + j) : 0) |
((i & 8) ? 1 << j : 0);
#endif
}
}
for (i=0;i<0x10000;i++) {