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Implement video memory access to all text mode planes. Fixes Fasttracker

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3669
This commit is contained in:
Ralf Grillenberger 2011-01-19 18:26:06 +00:00
parent dfd2200771
commit 02b866dc4a
1 changed files with 19 additions and 2 deletions
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21
src/hardware/vga_memory.cpp
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@ -466,12 +466,29 @@ public:
}
Bitu readb(PhysPt addr) {
addr = PAGING_GetPhysicalAddress(addr) & vgapages.mask;
return vga.draw.font[addr];
switch(vga.gfx.read_map_select) {
case 0: // character index
return vga.mem.linear[CHECKED3(vga.svga.bank_read_full+addr)];
case 1: // character attribute
return vga.mem.linear[CHECKED3(vga.svga.bank_read_full+addr+1)];
case 2: // font map
return vga.draw.font[addr];
default: // 3=unused, but still RAM that could save values
return 0;
}
}
void writeb(PhysPt addr,Bitu val){
addr = PAGING_GetPhysicalAddress(addr) & vgapages.mask;
if (vga.seq.map_mask & 0x4) {
if (GCC_LIKELY(vga.seq.map_mask == 0x4)) {
vga.draw.font[addr]=(Bit8u)val;
} else {
if (vga.seq.map_mask & 0x4) // font map
vga.draw.font[addr]=(Bit8u)val;
if (vga.seq.map_mask & 0x2) // character attribute
vga.mem.linear[CHECKED3(vga.svga.bank_read_full+addr+1)]=(Bit8u)val;
if (vga.seq.map_mask & 0x1) // character index
vga.mem.linear[CHECKED3(vga.svga.bank_read_full+addr)]=(Bit8u)val;
}
}
};