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Fix supersaxxon. Regression from line based updates. Thanks h-a-l-9000

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3744
This commit is contained in:
Peter Veenstra 2011-08-30 08:30:40 +00:00
parent b40ab65dcb
commit 770732bef7
1 changed files with 5 additions and 4 deletions
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9
src/hardware/vga_draw.cpp
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@ -77,20 +77,20 @@ static Bitu temp[643]={0};
static Bit8u * VGA_Draw_CGA16_Line(Bitu vidstart, Bitu line) {
const Bit8u *base = vga.tandy.draw_base + ((line & vga.tandy.line_mask) << vga.tandy.line_shift);
const Bit8u *reader = base + vidstart;
#define CGA16_READER(OFF) (base[(vidstart +(OFF))& (8*1024 -1)])
Bit32u * draw=(Bit32u *)TempLine;
//Generate a temporary bitline to calculate the avarage
//over bit-2 bit-1 bit bit+1.
//Combine this number with the current colour to get
//an unigue index in the pallete. Or it with bit 7 as they are stored
//an unique index in the pallete. Or it with bit 7 as they are stored
//in the upperpart to keep them from interfering the regular cga stuff
for(Bitu x = 0; x < 640; x++)
temp[x+2] = (( reader[(x>>3)] >> (7-(x&7)) )&1) << 4;
temp[x+2] = (( CGA16_READER(x>>3)>> (7-(x&7)) )&1) << 4;
//shift 4 as that is for the index.
Bitu i = 0,temp1,temp2,temp3,temp4;
for (Bitu x=0;x<vga.draw.blocks;x++) {
Bitu val1 = *reader++;
Bitu val1 = CGA16_READER(x);
Bitu val2 = val1&0xf;
val1 >>= 4;
@ -113,6 +113,7 @@ static Bit8u * VGA_Draw_CGA16_Line(Bitu vidstart, Bitu line) {
((temp4|val2) <<24);
}
return TempLine;
#undef CGA16_READER
}
static Bit8u * VGA_Draw_4BPP_Line(Bitu vidstart, Bitu line) {