464 lines
16 KiB
C
464 lines
16 KiB
C
/*Trident TVGA (8900D) emulation*/
|
|
#include <stdlib.h>
|
|
#include "ibm.h"
|
|
#include "device.h"
|
|
#include "io.h"
|
|
#include "mem.h"
|
|
#include "rom.h"
|
|
#include "video.h"
|
|
#include "vid_svga.h"
|
|
#include "vid_svga_render.h"
|
|
#include "vid_tkd8001_ramdac.h"
|
|
#include "vid_tvga.h"
|
|
|
|
enum
|
|
{
|
|
TVGA_8900D = 0x33,
|
|
TVGA_9000 = 0x23
|
|
};
|
|
|
|
typedef struct tvga_t
|
|
{
|
|
mem_mapping_t linear_mapping;
|
|
mem_mapping_t accel_mapping;
|
|
|
|
svga_t svga;
|
|
tkd8001_ramdac_t ramdac;
|
|
|
|
rom_t bios_rom;
|
|
|
|
uint8_t tvga_3d8, tvga_3d9;
|
|
int oldmode;
|
|
uint8_t oldctrl1;
|
|
uint8_t oldctrl2, newctrl2;
|
|
|
|
int vram_size;
|
|
uint32_t vram_mask;
|
|
|
|
uint8_t id;
|
|
} tvga_t;
|
|
|
|
static uint8_t crtc_mask[0x40] =
|
|
{
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0x7f, 0xff, 0x3f, 0x7f, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0x7f, 0xff, 0xff, 0xef,
|
|
0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
|
|
0x7f, 0x00, 0x00, 0x2f, 0x00, 0x00, 0x00, 0x03,
|
|
0x00, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
|
};
|
|
|
|
static void tvga_recalcbanking(tvga_t *tvga);
|
|
void tvga_out(uint16_t addr, uint8_t val, void *p)
|
|
{
|
|
tvga_t *tvga = (tvga_t *)p;
|
|
svga_t *svga = &tvga->svga;
|
|
|
|
uint8_t old;
|
|
|
|
// pclog("tvga_out : %04X %02X %04X:%04X %i\n", addr, val, CS,pc, svga->bpp);
|
|
if (((addr&0xFFF0) == 0x3D0 || (addr&0xFFF0) == 0x3B0) && !(svga->miscout & 1)) addr ^= 0x60;
|
|
|
|
switch (addr)
|
|
{
|
|
case 0x3C5:
|
|
switch (svga->seqaddr & 0xf)
|
|
{
|
|
case 0xB:
|
|
tvga->oldmode=1;
|
|
break;
|
|
case 0xC:
|
|
if (svga->seqregs[0xe] & 0x80)
|
|
svga->seqregs[0xc] = val;
|
|
break;
|
|
case 0xd:
|
|
if (tvga->oldmode)
|
|
tvga->oldctrl2 = val;
|
|
else
|
|
{
|
|
tvga->newctrl2 = val;
|
|
svga_recalctimings(svga);
|
|
}
|
|
break;
|
|
case 0xE:
|
|
if (tvga->oldmode)
|
|
{
|
|
tvga->oldctrl1 = val;
|
|
svga_recalctimings(svga);
|
|
}
|
|
else
|
|
{
|
|
svga->seqregs[0xe] = val ^ 2;
|
|
tvga->tvga_3d8 = svga->seqregs[0xe] & 0xf;
|
|
tvga_recalcbanking(tvga);
|
|
}
|
|
return;
|
|
}
|
|
break;
|
|
|
|
case 0x3C6: case 0x3C7: case 0x3C8: case 0x3C9:
|
|
if (tvga->id != TVGA_9000)
|
|
{
|
|
tkd8001_ramdac_out(addr, val, &tvga->ramdac, svga);
|
|
return;
|
|
}
|
|
break;
|
|
|
|
case 0x3CF:
|
|
switch (svga->gdcaddr & 15)
|
|
{
|
|
case 0xE:
|
|
svga->gdcreg[0xe] = val ^ 2;
|
|
tvga->tvga_3d9 = svga->gdcreg[0xe] & 0xf;
|
|
tvga_recalcbanking(tvga);
|
|
break;
|
|
case 0xF:
|
|
svga->gdcreg[0xf] = val;
|
|
tvga_recalcbanking(tvga);
|
|
break;
|
|
}
|
|
break;
|
|
case 0x3D4:
|
|
svga->crtcreg = val & 0x3f;
|
|
return;
|
|
case 0x3D5:
|
|
if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
|
|
return;
|
|
if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
|
|
val = (svga->crtc[7] & ~0x10) | (val & 0x10);
|
|
old = svga->crtc[svga->crtcreg];
|
|
val &= crtc_mask[svga->crtcreg];
|
|
svga->crtc[svga->crtcreg] = val;
|
|
// if (svga->crtcreg != 0xC && svga->crtcreg != 0xE && svga->crtcreg != 0xF) pclog("CRTC R%02X = %02X %04X:%04X\n", svga->crtcreg, val, CS, pc);
|
|
if (old != val)
|
|
{
|
|
if (svga->crtcreg < 0xE || svga->crtcreg > 0x10)
|
|
{
|
|
svga->fullchange = changeframecount;
|
|
svga_recalctimings(svga);
|
|
}
|
|
}
|
|
switch (svga->crtcreg)
|
|
{
|
|
case 0x1e:
|
|
svga->vram_display_mask = (val & 0x80) ? tvga->vram_mask : 0x3ffff;
|
|
break;
|
|
}
|
|
return;
|
|
case 0x3D8:
|
|
if (svga->gdcreg[0xf] & 4)
|
|
{
|
|
tvga->tvga_3d8 = val;
|
|
tvga_recalcbanking(tvga);
|
|
}
|
|
return;
|
|
case 0x3D9:
|
|
if (svga->gdcreg[0xf] & 4)
|
|
{
|
|
tvga->tvga_3d9 = val;
|
|
tvga_recalcbanking(tvga);
|
|
}
|
|
return;
|
|
case 0x3DB:
|
|
if (tvga->id == TVGA_8900D)
|
|
{
|
|
/*3db appears to be a 4 bit clock select register on 8900D*/
|
|
svga->miscout = (svga->miscout & ~0x0c) | ((val & 3) << 2);
|
|
tvga->newctrl2 = (tvga->newctrl2 & ~0x01) | ((val & 4) >> 2);
|
|
tvga->oldctrl1 = (tvga->oldctrl1 & ~0x10) | ((val & 8) << 1);
|
|
svga_recalctimings(svga);
|
|
}
|
|
break;
|
|
}
|
|
svga_out(addr, val, svga);
|
|
}
|
|
|
|
uint8_t tvga_in(uint16_t addr, void *p)
|
|
{
|
|
tvga_t *tvga = (tvga_t *)p;
|
|
svga_t *svga = &tvga->svga;
|
|
|
|
// if (addr != 0x3da) pclog("tvga_in : %04X %04X:%04X\n", addr, CS,pc);
|
|
|
|
if (((addr&0xFFF0) == 0x3D0 || (addr&0xFFF0) == 0x3B0) && !(svga->miscout & 1)) addr ^= 0x60;
|
|
|
|
switch (addr)
|
|
{
|
|
case 0x3C5:
|
|
if ((svga->seqaddr & 0xf) == 0xb)
|
|
{
|
|
// printf("Read Trident ID %04X:%04X %04X\n",CS,pc,readmemw(ss,SP));
|
|
tvga->oldmode = 0;
|
|
return tvga->id;
|
|
}
|
|
if ((svga->seqaddr & 0xf) == 0xc)
|
|
{
|
|
// printf("Read Trident Power Up 1 %04X:%04X %04X\n",CS,pc,readmemw(ss,SP));
|
|
// return 0x20; /*2 DRAM banks*/
|
|
}
|
|
if ((svga->seqaddr & 0xf) == 0xd)
|
|
{
|
|
if (tvga->oldmode) return tvga->oldctrl2;
|
|
return tvga->newctrl2;
|
|
}
|
|
if ((svga->seqaddr & 0xf) == 0xe)
|
|
{
|
|
if (tvga->oldmode)
|
|
return tvga->oldctrl1;
|
|
}
|
|
break;
|
|
case 0x3C6: case 0x3C7: case 0x3C8: case 0x3C9:
|
|
if (tvga->id != TVGA_9000)
|
|
return tkd8001_ramdac_in(addr, &tvga->ramdac, svga);
|
|
break;
|
|
case 0x3D4:
|
|
return svga->crtcreg;
|
|
case 0x3D5:
|
|
if (svga->crtcreg > 0x18 && svga->crtcreg < 0x1e)
|
|
return 0xff;
|
|
return svga->crtc[svga->crtcreg];
|
|
case 0x3d8:
|
|
return tvga->tvga_3d8;
|
|
case 0x3d9:
|
|
return tvga->tvga_3d9;
|
|
}
|
|
return svga_in(addr, svga);
|
|
}
|
|
|
|
static void tvga_recalcbanking(tvga_t *tvga)
|
|
{
|
|
svga_t *svga = &tvga->svga;
|
|
|
|
svga->write_bank = (tvga->tvga_3d8 & 0x1f) * 65536;
|
|
|
|
if (svga->gdcreg[0xf] & 1)
|
|
svga->read_bank = (tvga->tvga_3d9 & 0x1f) * 65536;
|
|
else
|
|
svga->read_bank = svga->write_bank;
|
|
|
|
// pclog("recalcbanking: write_bank=%08x read_bank=%08x GDC[E]=%02x GDC[F]=%02x SEQ[E]=%02x 3d8=%02x 3d9=%02x\n", svga->read_bank, svga->write_bank, svga->gdcreg[0xe], svga->gdcreg[0xf], svga->seqregs[0xe], tvga->tvga_3d8, tvga->tvga_3d9);
|
|
}
|
|
|
|
void tvga_recalctimings(svga_t *svga)
|
|
{
|
|
tvga_t *tvga = (tvga_t *)svga->p;
|
|
int clksel;
|
|
int high_res_256 = 0;
|
|
|
|
if (!svga->rowoffset) svga->rowoffset = 0x100; /*This is the only sensible way I can see this being handled,
|
|
given that TVGA8900D has no overflow bits.
|
|
Some sort of overflow is required for 320x200x24 and 1024x768x16*/
|
|
if (svga->crtc[0x29] & 0x10)
|
|
svga->rowoffset += 0x100;
|
|
|
|
if (svga->bpp == 24)
|
|
svga->hdisp = (svga->crtc[1] + 1) * 8;
|
|
|
|
if ((svga->crtc[0x1e] & 0xA0) == 0xA0) svga->ma_latch |= 0x10000;
|
|
if ((svga->crtc[0x27] & 0x01) == 0x01) svga->ma_latch |= 0x20000;
|
|
if ((svga->crtc[0x27] & 0x02) == 0x02) svga->ma_latch |= 0x40000;
|
|
|
|
if (tvga->oldctrl2 & 0x10)
|
|
{
|
|
svga->rowoffset <<= 1;
|
|
svga->ma_latch <<= 1;
|
|
}
|
|
if (svga->gdcreg[0xf] & 0x08)
|
|
{
|
|
svga->htotal *= 2;
|
|
svga->hdisp *= 2;
|
|
svga->hdisp_time *= 2;
|
|
}
|
|
|
|
svga->interlace = svga->crtc[0x1e] & 4;
|
|
if (svga->interlace)
|
|
svga->rowoffset >>= 1;
|
|
|
|
if (tvga->id == TVGA_8900D)
|
|
clksel = ((svga->miscout >> 2) & 3) | ((tvga->newctrl2 & 0x01) << 2) | ((tvga->oldctrl1 & 0x10) >> 1);
|
|
else
|
|
clksel = ((svga->miscout >> 2) & 3) | ((tvga->newctrl2 & 0x01) << 2) | ((tvga->newctrl2 & 0x40) >> 3);
|
|
switch (clksel)
|
|
{
|
|
case 0x2: svga->clock = (cpuclock * (double)(1ull << 32)) / 44900000.0; break;
|
|
case 0x3: svga->clock = (cpuclock * (double)(1ull << 32)) / 36000000.0; break;
|
|
case 0x4: svga->clock = (cpuclock * (double)(1ull << 32)) / 57272000.0; break;
|
|
case 0x5: svga->clock = (cpuclock * (double)(1ull << 32)) / 65000000.0; break;
|
|
case 0x6: svga->clock = (cpuclock * (double)(1ull << 32)) / 50350000.0; break;
|
|
case 0x7: svga->clock = (cpuclock * (double)(1ull << 32)) / 40000000.0; break;
|
|
case 0x8: svga->clock = (cpuclock * (double)(1ull << 32)) / 88000000.0; break;
|
|
case 0x9: svga->clock = (cpuclock * (double)(1ull << 32)) / 98000000.0; break;
|
|
case 0xa: svga->clock = (cpuclock * (double)(1ull << 32)) / 118800000.0; break;
|
|
case 0xb: svga->clock = (cpuclock * (double)(1ull << 32)) / 108000000.0; break;
|
|
case 0xc: svga->clock = (cpuclock * (double)(1ull << 32)) / 72000000.0; break;
|
|
case 0xd: svga->clock = (cpuclock * (double)(1ull << 32)) / 77000000.0; break;
|
|
case 0xe: svga->clock = (cpuclock * (double)(1ull << 32)) / 80000000.0; break;
|
|
case 0xf: svga->clock = (cpuclock * (double)(1ull << 32)) / 75000000.0; break;
|
|
}
|
|
|
|
if (tvga->id == TVGA_9000)
|
|
{
|
|
/*TVGA9000 doesn't seem to have support for a 'high res' 256 colour mode
|
|
(without the VGA pixel doubling). Instead it implements these modes by
|
|
doubling the horizontal pixel count and pixel clock. Hence we use a
|
|
basic heuristic to detect this*/
|
|
if (svga->interlace)
|
|
high_res_256 = (svga->htotal * 8) > (svga->vtotal * 4);
|
|
else
|
|
high_res_256 = (svga->htotal * 8) > (svga->vtotal * 2);
|
|
}
|
|
if ((tvga->oldctrl2 & 0x10) || high_res_256)
|
|
{
|
|
if (high_res_256)
|
|
svga->hdisp /= 2;
|
|
switch (svga->bpp)
|
|
{
|
|
case 8:
|
|
svga->render = svga_render_8bpp_highres;
|
|
break;
|
|
case 15:
|
|
svga->render = svga_render_15bpp_highres;
|
|
svga->hdisp /= 2;
|
|
break;
|
|
case 16:
|
|
svga->render = svga_render_16bpp_highres;
|
|
svga->hdisp /= 2;
|
|
break;
|
|
case 24:
|
|
svga->render = svga_render_24bpp_highres;
|
|
svga->hdisp /= 3;
|
|
break;
|
|
}
|
|
svga->lowres = 0;
|
|
}
|
|
}
|
|
|
|
static void *tvga_common_init(char *fn, uint32_t id, int vram_size)
|
|
{
|
|
tvga_t *tvga = malloc(sizeof(tvga_t));
|
|
memset(tvga, 0, sizeof(tvga_t));
|
|
|
|
tvga->vram_size = vram_size << 10;
|
|
tvga->vram_mask = tvga->vram_size - 1;
|
|
tvga->id = id;
|
|
|
|
rom_init(&tvga->bios_rom, fn, 0xc0000, 0x8000, 0x7fff, 0, MEM_MAPPING_EXTERNAL);
|
|
|
|
svga_init(&tvga->svga, tvga, tvga->vram_size,
|
|
tvga_recalctimings,
|
|
tvga_in, tvga_out,
|
|
NULL,
|
|
NULL);
|
|
|
|
io_sethandler(0x03c0, 0x0020, tvga_in, NULL, NULL, tvga_out, NULL, NULL, tvga);
|
|
|
|
return tvga;
|
|
}
|
|
static void *tvga8900d_init()
|
|
{
|
|
int vram_size = device_get_config_int("memory");
|
|
|
|
return tvga_common_init("trident.bin", TVGA_8900D, vram_size);
|
|
}
|
|
static void *tvga9000b_init()
|
|
{
|
|
return tvga_common_init("tvga9000b/BIOS.BIN", TVGA_9000, 512);
|
|
}
|
|
|
|
static int tvga8900d_available()
|
|
{
|
|
return rom_present("trident.bin");
|
|
}
|
|
static int tvga9000b_available()
|
|
{
|
|
return rom_present("tvga9000b/BIOS.BIN");
|
|
}
|
|
|
|
void tvga_close(void *p)
|
|
{
|
|
tvga_t *tvga = (tvga_t *)p;
|
|
|
|
svga_close(&tvga->svga);
|
|
|
|
free(tvga);
|
|
}
|
|
|
|
void tvga_speed_changed(void *p)
|
|
{
|
|
tvga_t *tvga = (tvga_t *)p;
|
|
|
|
svga_recalctimings(&tvga->svga);
|
|
}
|
|
|
|
void tvga_force_redraw(void *p)
|
|
{
|
|
tvga_t *tvga = (tvga_t *)p;
|
|
|
|
tvga->svga.fullchange = changeframecount;
|
|
}
|
|
|
|
void tvga_add_status_info(char *s, int max_len, void *p)
|
|
{
|
|
tvga_t *tvga = (tvga_t *)p;
|
|
|
|
svga_add_status_info(s, max_len, &tvga->svga);
|
|
}
|
|
|
|
static device_config_t tvga_config[] =
|
|
{
|
|
{
|
|
.name = "memory",
|
|
.description = "Memory size",
|
|
.type = CONFIG_SELECTION,
|
|
.selection =
|
|
{
|
|
{
|
|
.description = "256 kB",
|
|
.value = 256
|
|
},
|
|
{
|
|
.description = "512 kB",
|
|
.value = 512
|
|
},
|
|
{
|
|
.description = "1 MB",
|
|
.value = 1024
|
|
},
|
|
/*Chip supports 2mb, but drivers are buggy*/
|
|
{
|
|
.description = ""
|
|
}
|
|
},
|
|
.default_int = 1024
|
|
},
|
|
{
|
|
.type = -1
|
|
}
|
|
};
|
|
|
|
device_t tvga8900d_device =
|
|
{
|
|
"Trident TVGA 8900D",
|
|
0,
|
|
tvga8900d_init,
|
|
tvga_close,
|
|
tvga8900d_available,
|
|
tvga_speed_changed,
|
|
tvga_force_redraw,
|
|
tvga_add_status_info,
|
|
tvga_config
|
|
};
|
|
device_t tvga9000b_device =
|
|
{
|
|
"Trident TVGA 9000B",
|
|
0,
|
|
tvga9000b_init,
|
|
tvga_close,
|
|
tvga9000b_available,
|
|
tvga_speed_changed,
|
|
tvga_force_redraw,
|
|
tvga_add_status_info,
|
|
NULL
|
|
};
|