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Added option to disable CGA snow emulation.

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This commit is contained in:
SarahW 2016-07-21 21:36:51 +01:00
commit 9111b282f9
2 changed files with 18 additions and 4 deletions
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21
src/vid_cga.c
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@ -81,8 +81,11 @@ void cga_write(uint32_t addr, uint8_t val, void *p)
cga_t *cga = (cga_t *)p;
// pclog("CGA_WRITE %04X %02X\n", addr, val);
cga->vram[addr & 0x3fff] = val;
cga->charbuffer[ ((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc] = val;
cga->charbuffer[(((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc) | 1] = val;
if (cga->snow_enabled)
{
cga->charbuffer[ ((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc] = val;
cga->charbuffer[(((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc) | 1] = val;
}
egawrites++;
cycles -= 4;
}
@ -91,8 +94,11 @@ uint8_t cga_read(uint32_t addr, void *p)
{
cga_t *cga = (cga_t *)p;
cycles -= 4;
cga->charbuffer[ ((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc] = cga->vram[addr & 0x3fff];
cga->charbuffer[(((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc) | 1] = cga->vram[addr & 0x3fff];
if (cga->snow_enabled)
{
cga->charbuffer[ ((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc] = cga->vram[addr & 0x3fff];
cga->charbuffer[(((int)(((cga->dispontime - cga->vidtime) * 2) / CGACONST)) & 0xfc) | 1] = cga->vram[addr & 0x3fff];
}
egareads++;
// pclog("CGA_READ %04X\n", addr);
return cga->vram[addr & 0x3fff];
@ -443,6 +449,7 @@ void *cga_standalone_init()
display_type = device_get_config_int("display_type");
cga->composite = (display_type != CGA_RGB);
cga->revision = device_get_config_int("composite_type");
cga->snow_enabled = device_get_config_int("snow_enabled");
cga->vram = malloc(0x4000);
@ -511,6 +518,12 @@ static device_config_t cga_config[] =
},
.default_int = COMPOSITE_OLD
},
{
.name = "snow_enabled",
.description = "Snow emulation",
.type = CONFIG_BINARY,
.default_int = 1
},
{
.type = -1
}

1
src/vid_cga.h
View file

@ -30,6 +30,7 @@ typedef struct cga_t
int revision;
int composite;
int snow_enabled;
} cga_t;
void cga_init(cga_t *cga);