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Added mc6845->has_valid_parameters in mc6845_assert_light_pen_input, so that processing only happens

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if the chip was correctly configured
This commit is contained in:
Zsolt Vasvari 2008-03-01 01:58:51 +00:00
parent fe74a22163
commit 09bf1cb3e4
1 changed files with 20 additions and 17 deletions
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37
src/emu/video/mc6845.c
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@ -437,26 +437,29 @@ void mc6845_assert_light_pen_input(mc6845_t *mc6845)
assert(mc6845 != NULL); assert(mc6845 != NULL);
/* get the current pixel coordinates */ if (mc6845->has_valid_parameters)
y = video_screen_get_vpos(mc6845->intf->scrnum);
x = video_screen_get_hpos(mc6845->intf->scrnum);
/* 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;
/* adjust if we are passed the boundaries of the screen */
if (x == mc6845->horiz_pix_total)
{ {
y = y + 1; /* get the current pixel coordinates */
x = 0; y = video_screen_get_vpos(mc6845->intf->scrnum);
x = video_screen_get_hpos(mc6845->intf->scrnum);
if (y == mc6845->vert_pix_total) /* compute the pixel coordinate of the NEXT character -- this is when the light pen latches */
y = 0; char_x = x / mc6845->intf->hpixels_per_column;
x = (char_x + 1) * mc6845->intf->hpixels_per_column;
/* adjust if we are passed the boundaries of the screen */
if (x == mc6845->horiz_pix_total)
{
y = y + 1;
x = 0;
if (y == mc6845->vert_pix_total)
y = 0;
}
/* set the timer that will latch the display address into the light pen registers */
timer_adjust_oneshot(mc6845->light_pen_latch_timer, video_screen_get_time_until_pos(mc6845->intf->scrnum, y, x), 0);
} }
/* set the timer that will latch the display address into the light pen registers */
timer_adjust_oneshot(mc6845->light_pen_latch_timer, video_screen_get_time_until_pos(mc6845->intf->scrnum, y, x), 0);
} }