Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-24 17:30:55 +03:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

Added mc6845_set_hpixels_per_column() for the Hercules gfx adapter

Browse Source
This commit is contained in:
Zsolt Vasvari 2008-03-23 15:24:56 +00:00
parent 2cf47b7531
commit c27dfa66fa
2 changed files with 29 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
src/emu/video/mc6845.c
View File

@ -81,6 +81,7 @@ struct _mc6845_t
/* other internal state */
UINT64 clock;
UINT8 register_address_latch;
UINT8 hpixels_per_column;
UINT8 cursor_state; /* 0 = off, 1 = on */
UINT8 cursor_blink_count;
@ -228,11 +229,11 @@ static void recompute_parameters(mc6845_t *mc6845, int postload)
UINT16 hsync_on_pos, hsync_off_pos, vsync_on_pos, vsync_off_pos;
/* compute the screen sizes */
UINT16 horiz_pix_total = (mc6845->horiz_char_total + 1) * mc6845->intf->hpixels_per_column;
UINT16 horiz_pix_total = (mc6845->horiz_char_total + 1) * mc6845->hpixels_per_column;
UINT16 vert_pix_total = (mc6845->vert_char_total + 1) * (mc6845->max_ras_addr + 1) + mc6845->vert_total_adj;
/* determine the visible area, avoid division by 0 */
UINT16 max_visible_x = mc6845->horiz_disp * mc6845->intf->hpixels_per_column - 1;
UINT16 max_visible_x = mc6845->horiz_disp * mc6845->hpixels_per_column - 1;
UINT16 max_visible_y = mc6845->vert_disp * (mc6845->max_ras_addr + 1) - 1;
/* determine the syncing positions */
@ -245,8 +246,8 @@ static void recompute_parameters(mc6845_t *mc6845, int postload)
if (vert_sync_pix_width == 0)
vert_sync_pix_width = 0x10;
hsync_on_pos = mc6845->horiz_sync_pos * mc6845->intf->hpixels_per_column;
hsync_off_pos = hsync_on_pos + (horiz_sync_char_width * mc6845->intf->hpixels_per_column);
hsync_on_pos = mc6845->horiz_sync_pos * mc6845->hpixels_per_column;
hsync_off_pos = hsync_on_pos + (horiz_sync_char_width * mc6845->hpixels_per_column);
vsync_on_pos = mc6845->vert_sync_pos * (mc6845->max_ras_addr + 1);
vsync_off_pos = vsync_on_pos + vert_sync_pix_width;
@ -475,7 +476,7 @@ UINT16 mc6845_get_ma(const device_config *device)
ret = (mc6845->disp_start_addr +
(y / (mc6845->max_ras_addr + 1)) * mc6845->horiz_disp +
(x / mc6845->intf->hpixels_per_column)) & 0x3fff;
(x / mc6845->hpixels_per_column)) & 0x3fff;
}
else
ret = 0;
@ -530,8 +531,8 @@ void mc6845_assert_light_pen_input(const device_config *device)
x = video_screen_get_hpos(mc6845->screen);
/* compute the pixel coordinate of the NEXT character -- this is when the light pen latches */
char_x = x / mc6845->intf->hpixels_per_column;
x = (char_x + 1) * mc6845->intf->hpixels_per_column;
char_x = x / mc6845->hpixels_per_column;
x = (char_x + 1) * mc6845->hpixels_per_column;
/* adjust if we are passed the boundaries of the screen */
if (x == mc6845->horiz_pix_total)
@ -564,6 +565,21 @@ void mc6845_set_clock(const device_config *device, int clock)
}
void mc6845_set_hpixels_per_column(const device_config *device, int hpixels_per_column)
{
mc6845_t *mc6845 = get_safe_token(device);
/* validate arguments */
assert(hpixels_per_column > 0);
if (hpixels_per_column != mc6845->hpixels_per_column)
{
mc6845->hpixels_per_column = hpixels_per_column;
recompute_parameters(mc6845, FALSE);
}
}
static void update_cursor_state(mc6845_t *mc6845)
{
/* save and increment cursor counter */
@ -677,8 +693,9 @@ static void common_start(const device_config *device, int device_type)
assert(mc6845->intf->clock > 0);
assert(mc6845->intf->hpixels_per_column > 0);
/* copy the initial clock */
/* copy the initial parameters */
mc6845->clock = mc6845->intf->clock;
mc6845->hpixels_per_column = mc6845->intf->hpixels_per_column;
/* get the screen device */
mc6845->screen = device_list_find_by_tag(device->machine->config->devicelist, VIDEO_SCREEN, mc6845->intf->screen_tag);
@ -709,6 +726,7 @@ static void common_start(const device_config *device, int device_type)
state_save_register_func_postload_ptr(mc6845_state_save_postload, mc6845);
state_save_register_item(unique_tag, 0, mc6845->clock);
state_save_register_item(unique_tag, 0, mc6845->hpixels_per_column);
state_save_register_item(unique_tag, 0, mc6845->register_address_latch);
state_save_register_item(unique_tag, 0, mc6845->horiz_char_total);
state_save_register_item(unique_tag, 0, mc6845->horiz_disp);

3
src/emu/video/mc6845.h
View File

@ -110,6 +110,9 @@ void mc6845_assert_light_pen_input(const device_config *device);
/* set the clock (pin 21) of the chip */
void mc6845_set_clock(const device_config *device, int clock);
/* set number of pixels per video memory address */
void mc6845_set_hpixels_per_column(const device_config *device, int hpixels_per_column);
/* updates the screen -- this will call begin_update(),
followed by update_row() reapeatedly and after all row
updating is complete, end_update() */