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artist: Emulate screen blanking 

The misc_video and misc_ctrl registers control the visibility of the
screen. Start with the screen turned on, and hide or show the screen
based on the control registers.

Signed-off-by: Helge Deller <deller@gmx.de>
Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Helge Deller 2022-05-11 12:59:47 +02:00
parent a377b574eb
commit caca6e618d
1 changed files with 30 additions and 0 deletions
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30
hw/display/artist.c
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@ -201,6 +201,8 @@ static const char *artist_reg_name(uint64_t addr)
}
#undef REG_NAME
static void artist_invalidate(void *opaque);
/* artist has a fixed line length of 2048 bytes. */
#define ADDR_TO_Y(addr) extract32(addr, 11, 11)
#define ADDR_TO_X(addr) extract32(addr, 0, 11)
@ -903,6 +905,7 @@ static void artist_reg_write(void *opaque, hwaddr addr, uint64_t val,
{
ARTISTState *s = opaque;
int width, height;
uint64_t oldval;
trace_artist_reg_write(size, addr, artist_reg_name(addr & ~3ULL), val);
@ -1061,7 +1064,18 @@ static void artist_reg_write(void *opaque, hwaddr addr, uint64_t val,
break;
case MISC_VIDEO:
oldval = s->misc_video;
combine_write_reg(addr, val, size, &s->misc_video);
/* Invalidate and hide screen if graphics signal is turned off. */
if (((oldval & 0x0A000000) == 0x0A000000) &&
((val & 0x0A000000) != 0x0A000000)) {
artist_invalidate(s);
}
/* Invalidate and redraw screen if graphics signal is turned back on. */
if (((oldval & 0x0A000000) != 0x0A000000) &&
((val & 0x0A000000) == 0x0A000000)) {
artist_invalidate(s);
}
break;
case MISC_CTRL:
@ -1263,6 +1277,12 @@ static void artist_draw_cursor(ARTISTState *s)
}
}
static bool artist_screen_enabled(ARTISTState *s)
{
/* We could check for (s->misc_ctrl & 0x00800000) too... */
return ((s->misc_video & 0x0A000000) == 0x0A000000);
}
static void artist_draw_line(void *opaque, uint8_t *d, const uint8_t *src,
int width, int pitch)
{
@ -1270,6 +1290,12 @@ static void artist_draw_line(void *opaque, uint8_t *d, const uint8_t *src,
uint32_t *cmap, *data = (uint32_t *)d;
int x;
if (!artist_screen_enabled(s)) {
/* clear screen */
memset(data, 0, s->width * sizeof(uint32_t));
return;
}
cmap = (uint32_t *)(s->vram_buffer[ARTIST_BUFFER_CMAP].data + 0x400);
for (x = 0; x < s->width; x++) {
@ -1384,6 +1410,10 @@ static void artist_realizefn(DeviceState *dev, Error **errp)
s->image_bitmap_op = 0x23000300;
s->plane_mask = 0xff;
/* enable screen */
s->misc_video |= 0x0A000000;
s->misc_ctrl |= 0x00800000;
s->con = graphic_console_init(dev, 0, &artist_ops, s);
qemu_console_resize(s->con, s->width, s->height);
}