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some support for 128k mode

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This commit is contained in:
notaz 2017-09-27 00:20:52 +03:00
parent b0e08dff9a
commit b71cbbf705
2 changed files with 35 additions and 9 deletions
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3
pico/pico_int.h
View file

@ -292,7 +292,8 @@ struct PicoVideo
unsigned char pending_ints; // pending interrupts: ??VH????
signed char lwrite_cnt; // VDP write count during active display line
unsigned short v_counter; // V-counter
unsigned char pad[0x10];
unsigned char addr_u;
unsigned char pad[0x0f];
};
struct PicoMisc

41
pico/videoport.c
View file

@ -29,6 +29,13 @@ static __inline void AutoIncrement(void)
Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);
}
static NOINLINE void VideoWrite128(u32 a, u16 d)
{
// nasty
a = ((a & 2) >> 1) | ((a & 0x400) >> 9) | (a & 0x3FC) | ((a & 0x1F800) >> 1);
((u8 *)Pico.vram)[a] = d;
}
static void VideoWrite(u16 d)
{
unsigned int a=Pico.video.addr;
@ -43,6 +50,10 @@ static void VideoWrite(u16 d)
case 3: Pico.m.dirtyPal = 1;
Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)
case 5: Pico.vsram[(a>>1)&0x003f]=d; break;
case 0x81:
a |= Pico.video.addr_u << 16;
VideoWrite128(a, d);
break;
//default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;
}
@ -186,6 +197,17 @@ static void DmaSlow(int len, unsigned int source)
}
break;
case 0x81: // vram 128k
a |= Pico.video.addr_u << 16;
for(; len; len--)
{
VideoWrite128(a, base[source++ & mask]);
// AutoIncrement
a = (a + inc) & 0x1ffff;
}
Pico.video.addr_u = a >> 16;
break;
default:
if (Pico.video.type != 0 || (EL_LOGMASK & EL_VDPDMA))
elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);
@ -303,20 +325,23 @@ static NOINLINE void CommandDma(void)
Pico.video.reg[0x16] = source >> 8;
}
static void CommandChange(void)
static NOINLINE void CommandChange(void)
{
struct PicoVideo *pvid=&Pico.video;
unsigned int cmd=0,addr=0;
struct PicoVideo *pvid = &Pico.video;
unsigned int cmd, addr;
cmd=pvid->command;
cmd = pvid->command;
// Get type of transfer 0xc0000030 (v/c/vsram read/write)
pvid->type=(unsigned char)(((cmd>>2)&0xc)|(cmd>>30));
pvid->type = (u8)(((cmd >> 2) & 0xc) | (cmd >> 30));
if (pvid->type == 1) // vram
pvid->type |= pvid->reg[1] & 0x80; // 128k
// Get address 0x3fff0003
addr =(cmd>>16)&0x3fff;
addr|=(cmd<<14)&0xc000;
pvid->addr=(unsigned short)addr;
addr = (cmd >> 16) & 0x3fff;
addr |= (cmd << 14) & 0xc000;
pvid->addr = (u16)addr;
pvid->addr_u = (u8)((cmd >> 2) & 1);
}
static void DrawSync(int blank_on)