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This commit is contained in:
starfrost013
2025-06-16 23:41:01 +01:00
parent 3c29c00a94
commit b732ece04d
1 changed files with 98 additions and 137 deletions
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179
src/video/vid_mda.c
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@@ -37,13 +37,12 @@
#include <86box/plat_unused.h> #include <86box/plat_unused.h>
// Enumerates MDA monitor types // Enumerates MDA monitor types
enum mda_monitor_type_e enum mda_monitor_type_e {
{ MDA_MONITOR_TYPE_DEFAULT = 0, // Default MDA monitor type.
MDA_MONITOR_TYPE_DEFAULT = 0, // Default MDA monitor type. MDA_MONITOR_TYPE_GREEN = 1, // Green phosphor
MDA_MONITOR_TYPE_GREEN = 1, // Green phosphor MDA_MONITOR_TYPE_AMBER = 2, // Amber phosphor
MDA_MONITOR_TYPE_AMBER = 2, // Amber phosphor MDA_MONITOR_TYPE_GRAY = 3, // Gray phosphor
MDA_MONITOR_TYPE_GRAY = 3, // Gray phosphor MDA_MONITOR_TYPE_RGBI = 4, // RGBI colour monitor with modified rev1 or rev0 MDA card for colour support
MDA_MONITOR_TYPE_RGBI = 4, // RGBI colour monitor with modified rev1 or rev0 MDA card for colour support
} mda_monitor_type; } mda_monitor_type;
// [attr][blink][fg] // [attr][blink][fg]
@@ -59,11 +58,10 @@ mda_out(uint16_t addr, uint8_t val, void *priv)
mda_t *mda = (mda_t *) priv; mda_t *mda = (mda_t *) priv;
if (addr < MDA_REGISTER_START if (addr < MDA_REGISTER_START
|| addr > MDA_REGISTER_CRT_STATUS) // Maintain old behaviour for printer registers, just in case || addr > MDA_REGISTER_CRT_STATUS) // Maintain old behaviour for printer registers, just in case
return; return;
switch (addr) switch (addr) {
{
case MDA_REGISTER_MODE_CONTROL: case MDA_REGISTER_MODE_CONTROL:
mda->mode = val; mda->mode = val;
return; return;
@@ -73,20 +71,17 @@ mda_out(uint16_t addr, uint8_t val, void *priv)
// addr & 1 == 1 = MDA_REGISTER_CRTC_DATA // addr & 1 == 1 = MDA_REGISTER_CRTC_DATA
// otherwise MDA_REGISTER_CRTC_INDEX // otherwise MDA_REGISTER_CRTC_INDEX
if (addr & 1) if (addr & 1) {
{
mda->crtc[mda->crtcreg] = val; mda->crtc[mda->crtcreg] = val;
if (mda->crtc[MDA_CRTC_CURSOR_START] == 6 if (mda->crtc[MDA_CRTC_CURSOR_START] == 6
&& mda->crtc[MDA_CRTC_CURSOR_END] == 7) /*Fix for Generic Turbo XT BIOS, which sets up cursor registers wrong*/ && mda->crtc[MDA_CRTC_CURSOR_END] == 7) /*Fix for Generic Turbo XT BIOS, which sets up cursor registers wrong*/
{ {
mda->crtc[MDA_CRTC_CURSOR_START] = 0xb; mda->crtc[MDA_CRTC_CURSOR_START] = 0xb;
mda->crtc[MDA_CRTC_CURSOR_END] = 0xc; mda->crtc[MDA_CRTC_CURSOR_END] = 0xc;
} }
mda_recalctimings(mda); mda_recalctimings(mda);
} } else
else
mda->crtcreg = val & 31; mda->crtcreg = val & 31;
} }
uint8_t uint8_t
@@ -94,13 +89,12 @@ mda_in(uint16_t addr, void *priv)
{ {
const mda_t *mda = (mda_t *) priv; const mda_t *mda = (mda_t *) priv;
switch (addr) switch (addr) {
{
case MDA_REGISTER_CRT_STATUS: case MDA_REGISTER_CRT_STATUS:
return mda->status | 0xF0; return mda->status | 0xF0;
default: default:
if (addr < MDA_REGISTER_START if (addr < MDA_REGISTER_START
|| addr > MDA_REGISTER_CRT_STATUS) // Maintain old behaviour for printer registers, just in case || addr > MDA_REGISTER_CRT_STATUS) // Maintain old behaviour for printer registers, just in case
return 0xFF; return 0xFF;
// MDA_REGISTER_CRTC_DATA // MDA_REGISTER_CRTC_DATA
@@ -148,8 +142,8 @@ mda_recalctimings(mda_t *mda)
void void
mda_poll(void *priv) mda_poll(void *priv)
{ {
mda_t *mda = (mda_t *) priv; mda_t *mda = (mda_t *) priv;
uint16_t cursoraddr = (mda->crtc[MDA_CRTC_CURSOR_ADDR_LOW] | (mda->crtc[MDA_CRTC_CURSOR_ADDR_HIGH] << 8)) & 0x3fff; uint16_t cursoraddr = (mda->crtc[MDA_CRTC_CURSOR_ADDR_LOW] | (mda->crtc[MDA_CRTC_CURSOR_ADDR_HIGH] << 8)) & 0x3fff;
bool drawcursor; bool drawcursor;
int32_t oldvc; int32_t oldvc;
uint8_t chr; uint8_t chr;
@@ -159,26 +153,22 @@ mda_poll(void *priv)
VIDEO_MONITOR_PROLOGUE() VIDEO_MONITOR_PROLOGUE()
if (!mda->linepos) if (!mda->linepos) {
{
timer_advance_u64(&mda->timer, mda->dispofftime); timer_advance_u64(&mda->timer, mda->dispofftime);
mda->status |= 1; mda->status |= 1;
mda->linepos = 1; mda->linepos = 1;
scanline_old = mda->scanline; scanline_old = mda->scanline;
if ((mda->crtc[MDA_CRTC_INTERLACE] & 3) == 3) if ((mda->crtc[MDA_CRTC_INTERLACE] & 3) == 3)
mda->scanline = (mda->scanline << 1) & 7; mda->scanline = (mda->scanline << 1) & 7;
if (mda->dispon) if (mda->dispon) {
{ if (mda->displine < mda->firstline) {
if (mda->displine < mda->firstline)
{
mda->firstline = mda->displine; mda->firstline = mda->displine;
video_wait_for_buffer(); video_wait_for_buffer();
} }
mda->lastline = mda->displine; mda->lastline = mda->displine;
for (uint32_t x = 0; x < mda->crtc[MDA_CRTC_HDISP]; x++) for (uint32_t x = 0; x < mda->crtc[MDA_CRTC_HDISP]; x++) {
{
chr = mda->vram[(mda->memaddr << 1) & 0xfff]; chr = mda->vram[(mda->memaddr << 1) & 0xfff];
attr = mda->vram[((mda->memaddr << 1) + 1) & 0xfff]; attr = mda->vram[((mda->memaddr << 1) + 1) & 0xfff];
drawcursor = ((mda->memaddr == cursoraddr) && mda->cursorvisible && mda->cursoron); drawcursor = ((mda->memaddr == cursoraddr) && mda->cursorvisible && mda->cursoron);
@@ -189,14 +179,13 @@ mda_poll(void *priv)
// If we are using an RGBI monitor allow colour // If we are using an RGBI monitor allow colour
if (mda->monitor_type == MDA_MONITOR_TYPE_RGBI if (mda->monitor_type == MDA_MONITOR_TYPE_RGBI
&& !(mda->mode & MDA_MODE_BW)) && !(mda->mode & MDA_MODE_BW)) {
{
color_bg = (attr >> 4) & 0x0F; color_bg = (attr >> 4) & 0x0F;
color_fg = (attr & 0x0F); color_fg = (attr & 0x0F);
// turn off bright bg colours in blink mode // turn off bright bg colours in blink mode
if ((mda->mode & MDA_MODE_BLINK) if ((mda->mode & MDA_MODE_BLINK)
&& (color_bg & 0x8)) && (color_bg & 0x8))
color_bg & ~(0x8); color_bg & ~(0x8);
// black-on-non black or white colours forced to white // black-on-non black or white colours forced to white
@@ -205,45 +194,37 @@ mda_poll(void *priv)
bool special_treatment = (color_bg != 0 && color_bg != 7); bool special_treatment = (color_bg != 0 && color_bg != 7);
if (color_fg == 8 if (color_fg == 8
&& special_treatment) && special_treatment)
color_fg = 15; color_fg = 15;
if (color_fg == 0 if (color_fg == 0
&& special_treatment) && special_treatment)
color_fg = 8; color_fg = 8;
// gray is black // gray is black
if (color_fg == 8 if (color_fg == 8
&& (color_bg == 8 || color_bg == 0)) && (color_bg == 8 || color_bg == 0))
color_fg = 0; color_fg = 0;
} }
if (mda->scanline == 12 if (mda->scanline == 12
&& ((attr & 7) == 1)) && ((attr & 7) == 1)) { // underline
{ // underline for (uint32_t column = 0; column < 9; column++) {
for (uint32_t column = 0; column < 9; column++)
{
if (mda->monitor_type == MDA_MONITOR_TYPE_RGBI if (mda->monitor_type == MDA_MONITOR_TYPE_RGBI
&& !(mda->mode & MDA_MODE_BW)) && !(mda->mode & MDA_MODE_BW)) {
{
buffer32->line[mda->displine][(x * 9) + column] = CGAPAL_CGA_START + color_fg; buffer32->line[mda->displine][(x * 9) + column] = CGAPAL_CGA_START + color_fg;
} } else
else
buffer32->line[mda->displine][(x * 9) + column] = mda_attr_to_color_table[attr][blink][1]; buffer32->line[mda->displine][(x * 9) + column] = mda_attr_to_color_table[attr][blink][1];
} }
} } else { // character
else for (uint32_t column = 0; column < 8; column++) {
{ // character // bg=0, fg=1
for (uint32_t column = 0; column < 8; column++)
{
//bg=0, fg=1
bool is_fg = (fontdatm[chr + mda->fontbase][mda->scanline] & (1 << (column ^ 7))) ? 1 : 0; bool is_fg = (fontdatm[chr + mda->fontbase][mda->scanline] & (1 << (column ^ 7))) ? 1 : 0;
uint32_t font_char = mda_attr_to_color_table[attr][blink][is_fg]; uint32_t font_char = mda_attr_to_color_table[attr][blink][is_fg];
if (mda->monitor_type == MDA_MONITOR_TYPE_RGBI if (mda->monitor_type == MDA_MONITOR_TYPE_RGBI
&& !(mda->mode & MDA_MODE_BW)) && !(mda->mode & MDA_MODE_BW)) {
{
if (!is_fg) if (!is_fg)
font_char = CGAPAL_CGA_START + color_bg; font_char = CGAPAL_CGA_START + color_bg;
else else
@@ -254,14 +235,12 @@ mda_poll(void *priv)
} }
// these characters (C0-DF) have their background extended to their 9th column // these characters (C0-DF) have their background extended to their 9th column
if ((chr & ~0x1f) == 0xc0) if ((chr & ~0x1f) == 0xc0) {
{ bool is_fg = fontdatm[chr + mda->fontbase][mda->scanline] & 1;
bool is_fg = fontdatm[chr + mda->fontbase][mda->scanline] & 1;
uint32_t final_result = mda_attr_to_color_table[attr][blink][is_fg]; uint32_t final_result = mda_attr_to_color_table[attr][blink][is_fg];
if (mda->monitor_type == MDA_MONITOR_TYPE_RGBI if (mda->monitor_type == MDA_MONITOR_TYPE_RGBI
&& !(mda->mode & MDA_MODE_BW)) && !(mda->mode & MDA_MODE_BW)) {
{
if (!is_fg) if (!is_fg)
final_result = CGAPAL_CGA_START + color_bg; final_result = CGAPAL_CGA_START + color_bg;
else else
@@ -270,32 +249,24 @@ mda_poll(void *priv)
buffer32->line[mda->displine][(x * 9) + 8] = final_result; buffer32->line[mda->displine][(x * 9) + 8] = final_result;
} } else {
else
{
if (mda->monitor_type == MDA_MONITOR_TYPE_RGBI if (mda->monitor_type == MDA_MONITOR_TYPE_RGBI
&& !(mda->mode & MDA_MODE_BW)) && !(mda->mode & MDA_MODE_BW)) {
{ buffer32->line[mda->displine][(x * 9) + 8] = CGAPAL_CGA_START + color_bg;
buffer32->line[mda->displine][(x * 9) + 8] = CGAPAL_CGA_START + color_bg;
} } else
else buffer32->line[mda->displine][(x * 9) + 8] = mda_attr_to_color_table[attr][blink][0];
buffer32->line[mda->displine][(x * 9) + 8] = mda_attr_to_color_table[attr][blink][0];
} }
} }
mda->memaddr++; mda->memaddr++;
if (drawcursor) if (drawcursor) {
{ for (uint32_t column = 0; column < 9; column++) {
for (uint32_t column = 0; column < 9; column++)
{
if (mda->monitor_type == MDA_MONITOR_TYPE_RGBI if (mda->monitor_type == MDA_MONITOR_TYPE_RGBI
&& !(mda->mode & MDA_MODE_BW)) && !(mda->mode & MDA_MODE_BW)) {
{
buffer32->line[mda->displine][(x * 9) + column] ^= CGAPAL_CGA_START + color_fg; buffer32->line[mda->displine][(x * 9) + column] ^= CGAPAL_CGA_START + color_fg;
} } else
else
buffer32->line[mda->displine][(x * 9) + column] ^= mda_attr_to_color_table[attr][0][1]; buffer32->line[mda->displine][(x * 9) + column] ^= mda_attr_to_color_table[attr][0][1];
} }
} }
@@ -316,41 +287,34 @@ mda_poll(void *priv)
mda->status &= ~1; mda->status &= ~1;
mda->linepos = 0; mda->linepos = 0;
if (mda->vsynctime) if (mda->vsynctime) {
{
mda->vsynctime--; mda->vsynctime--;
if (!mda->vsynctime) if (!mda->vsynctime) {
{
mda->status &= ~8; mda->status &= ~8;
} }
} }
if (mda->scanline == (mda->crtc[MDA_CRTC_CURSOR_END] & 31) if (mda->scanline == (mda->crtc[MDA_CRTC_CURSOR_END] & 31)
|| ((mda->crtc[MDA_CRTC_INTERLACE] & 3) == 3 || ((mda->crtc[MDA_CRTC_INTERLACE] & 3) == 3
&& mda->scanline == ((mda->crtc[MDA_CRTC_CURSOR_END] & 31) >> 1))) && mda->scanline == ((mda->crtc[MDA_CRTC_CURSOR_END] & 31) >> 1))) {
{ mda->cursorvisible = 0;
mda->cursorvisible = 0;
} }
if (mda->vadj) if (mda->vadj) {
{
mda->scanline++; mda->scanline++;
mda->scanline &= 31; mda->scanline &= 31;
mda->memaddr = mda->memaddr_backup; mda->memaddr = mda->memaddr_backup;
mda->vadj--; mda->vadj--;
if (!mda->vadj) if (!mda->vadj) {
{ mda->dispon = 1;
mda->dispon = 1;
mda->memaddr = mda->memaddr_backup = (mda->crtc[MDA_CRTC_START_ADDR_LOW] | (mda->crtc[MDA_CRTC_START_ADDR_HIGH] << 8)) & 0x3fff; mda->memaddr = mda->memaddr_backup = (mda->crtc[MDA_CRTC_START_ADDR_LOW] | (mda->crtc[MDA_CRTC_START_ADDR_HIGH] << 8)) & 0x3fff;
mda->scanline = 0; mda->scanline = 0;
} }
} } else if (mda->scanline == mda->crtc[MDA_CRTC_MAX_SCANLINE_ADDR]
else if (mda->scanline == mda->crtc[MDA_CRTC_MAX_SCANLINE_ADDR] || ((mda->crtc[MDA_CRTC_INTERLACE] & 3) == 3
|| ((mda->crtc[MDA_CRTC_INTERLACE] & 3) == 3 && mda->scanline == (mda->crtc[MDA_CRTC_MAX_SCANLINE_ADDR] >> 1))) {
&& mda->scanline == (mda->crtc[MDA_CRTC_MAX_SCANLINE_ADDR] >> 1)))
{
mda->memaddr_backup = mda->memaddr; mda->memaddr_backup = mda->memaddr;
mda->scanline = 0; mda->scanline = 0;
oldvc = mda->vc; oldvc = mda->vc;
mda->vc++; mda->vc++;
mda->vc &= 127; mda->vc &= 127;
if (mda->vc == mda->crtc[MDA_CRTC_VDISP]) if (mda->vc == mda->crtc[MDA_CRTC_VDISP])
@@ -404,8 +368,8 @@ mda_poll(void *priv)
} }
if (mda->scanline == (mda->crtc[MDA_CRTC_CURSOR_START] & 31) if (mda->scanline == (mda->crtc[MDA_CRTC_CURSOR_START] & 31)
|| ((mda->crtc[MDA_CRTC_INTERLACE] & 3) == 3 || ((mda->crtc[MDA_CRTC_INTERLACE] & 3) == 3
&& mda->scanline == ((mda->crtc[MDA_CRTC_CURSOR_START] & 31) >> 1))) { && mda->scanline == ((mda->crtc[MDA_CRTC_CURSOR_START] & 31) >> 1))) {
mda->cursorvisible = 1; mda->cursorvisible = 1;
} }
} }
@@ -416,8 +380,7 @@ void
mda_init(mda_t *mda) mda_init(mda_t *mda)
{ {
for (uint16_t attr = 0; attr < 256; attr++) for (uint16_t attr = 0; attr < 256; attr++) {
{
mda_attr_to_color_table[attr][0][0] = mda_attr_to_color_table[attr][1][0] = mda_attr_to_color_table[attr][1][1] = 16; mda_attr_to_color_table[attr][0][0] = mda_attr_to_color_table[attr][1][0] = mda_attr_to_color_table[attr][1][1] = 16;
if (attr & 8) if (attr & 8)
mda_attr_to_color_table[attr][0][1] = 15 + 16; mda_attr_to_color_table[attr][0][1] = 15 + 16;
@@ -426,23 +389,22 @@ mda_init(mda_t *mda)
} }
mda_attr_to_color_table[0x70][0][1] = 16; mda_attr_to_color_table[0x70][0][1] = 16;
mda_attr_to_color_table[0x70][0][0] = mda_attr_to_color_table[0x70][1][0] = mda_attr_to_color_table[0x70][1][1] = CGAPAL_CGA_START + 15; mda_attr_to_color_table[0x70][0][0] = mda_attr_to_color_table[0x70][1][0] = mda_attr_to_color_table[0x70][1][1] = CGAPAL_CGA_START + 15;
mda_attr_to_color_table[0xF0][0][1] = 16; mda_attr_to_color_table[0xF0][0][1] = 16;
mda_attr_to_color_table[0xF0][0][0] = mda_attr_to_color_table[0xF0][1][0] = mda_attr_to_color_table[0xF0][1][1] = CGAPAL_CGA_START + 15; mda_attr_to_color_table[0xF0][0][0] = mda_attr_to_color_table[0xF0][1][0] = mda_attr_to_color_table[0xF0][1][1] = CGAPAL_CGA_START + 15;
mda_attr_to_color_table[0x78][0][1] = CGAPAL_CGA_START + 7; mda_attr_to_color_table[0x78][0][1] = CGAPAL_CGA_START + 7;
mda_attr_to_color_table[0x78][0][0] = mda_attr_to_color_table[0x78][1][0] = mda_attr_to_color_table[0x78][1][1] = CGAPAL_CGA_START + 15; mda_attr_to_color_table[0x78][0][0] = mda_attr_to_color_table[0x78][1][0] = mda_attr_to_color_table[0x78][1][1] = CGAPAL_CGA_START + 15;
mda_attr_to_color_table[0xF8][0][1] = CGAPAL_CGA_START + 7; mda_attr_to_color_table[0xF8][0][1] = CGAPAL_CGA_START + 7;
mda_attr_to_color_table[0xF8][0][0] = mda_attr_to_color_table[0xF8][1][0] = mda_attr_to_color_table[0xF8][1][1] = CGAPAL_CGA_START + 15; mda_attr_to_color_table[0xF8][0][0] = mda_attr_to_color_table[0xF8][1][0] = mda_attr_to_color_table[0xF8][1][1] = CGAPAL_CGA_START + 15;
mda_attr_to_color_table[0x00][0][1] = mda_attr_to_color_table[0x00][1][1] = 16; mda_attr_to_color_table[0x00][0][1] = mda_attr_to_color_table[0x00][1][1] = 16;
mda_attr_to_color_table[0x08][0][1] = mda_attr_to_color_table[0x08][1][1] = 16; mda_attr_to_color_table[0x08][0][1] = mda_attr_to_color_table[0x08][1][1] = 16;
mda_attr_to_color_table[0x80][0][1] = mda_attr_to_color_table[0x80][1][1] = 16; mda_attr_to_color_table[0x80][0][1] = mda_attr_to_color_table[0x80][1][1] = 16;
mda_attr_to_color_table[0x88][0][1] = mda_attr_to_color_table[0x88][1][1] = 16; mda_attr_to_color_table[0x88][0][1] = mda_attr_to_color_table[0x88][1][1] = 16;
overscan_x = overscan_y = 0; overscan_x = overscan_y = 0;
mda->monitor_index = monitor_index_global; mda->monitor_index = monitor_index_global;
mda->monitor_type = device_get_config_int("rgb_type"); mda->monitor_type = device_get_config_int("rgb_type");
cga_palette = mda->monitor_type << 1; cga_palette = mda->monitor_type << 1;
if (cga_palette > 6) { if (cga_palette > 6) {
cga_palette = 0; cga_palette = 0;
} }
@@ -460,7 +422,7 @@ mda_standalone_init(UNUSED(const device_t *info))
mda->vram = malloc(0x1000); mda->vram = malloc(0x1000);
switch(device_get_config_int("font")) { switch (device_get_config_int("font")) {
case 0: case 0:
loadfont(FONT_IBM_MDA_437_PATH, 0); loadfont(FONT_IBM_MDA_437_PATH, 0);
break; break;
@@ -517,9 +479,8 @@ mda_speed_changed(void *priv)
mda_recalctimings(mda); mda_recalctimings(mda);
} }
static const device_config_t mda_config[] = { static const device_config_t mda_config[] = {
// clang-format off // clang-format off
{ {
.name = "rgb_type", .name = "rgb_type",
.description = "Display type", .description = "Display type",
@@ -558,7 +519,7 @@ static const device_config_t mda_config[] = {
.bios = { { 0 } } .bios = { { 0 } }
}, },
{ .name = "", .description = "", .type = CONFIG_END } { .name = "", .description = "", .type = CONFIG_END }
// clang-format on // clang-format on
}; };
const device_t mda_device = { const device_t mda_device = {