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pc_vga.cpp: ACTUALLY fix doom (nw)

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This commit is contained in:
Melissa Goad 2017-12-20 17:08:36 -06:00
parent d89ef19e41
commit cb08f9da0e
1 changed files with 5 additions and 6 deletions
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11
src/devices/video/pc_vga.cpp
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@ -84,7 +84,7 @@ enum
#define EGA_LINE_LENGTH (vga.crtc.offset<<1)
#define VGA_COLUMNS (vga.crtc.horz_disp_end+1)
#define VGA_START_ADDRESS (vga.crtc.start_addr)
#define VGA_START_ADDRESS ((vga.crtc.start_addr<<2)&0xffff)
#define VGA_LINE_LENGTH (vga.crtc.offset<<3)
#define IBM8514_LINE_LENGTH (m_vga->offset())
@ -221,9 +221,9 @@ void svga_device::zero()
/* VBLANK callback, start address definitely updates AT vblank, not before. */
TIMER_CALLBACK_MEMBER(vga_device::vblank_timer_cb)
{
vga.crtc.start_addr = vga.crtc.start_addr_latch << 2;
vga.crtc.start_addr = vga.crtc.start_addr_latch;
vga.attribute.pel_shift = vga.attribute.pel_shift_latch;
m_vblank_timer->adjust( machine().first_screen()->time_until_pos(vga.crtc.vert_blank_start + vga.crtc.vert_blank_end) );
m_vblank_timer->adjust( machine().first_screen()->time_until_pos(vga.crtc.vert_blank_start) );
}
TIMER_CALLBACK_MEMBER(s3_vga_device::vblank_timer_cb)
@ -234,7 +234,7 @@ TIMER_CALLBACK_MEMBER(s3_vga_device::vblank_timer_cb)
else
vga.crtc.start_addr = vga.crtc.start_addr_latch;
vga.attribute.pel_shift = vga.attribute.pel_shift_latch;
m_vblank_timer->adjust( machine().first_screen()->time_until_pos(vga.crtc.vert_blank_start + vga.crtc.vert_blank_end) );
m_vblank_timer->adjust( machine().first_screen()->time_until_pos(vga.crtc.vert_blank_start) );
}
void vga_device::device_start()
@ -1386,7 +1386,7 @@ void vga_device::recompute_params_clock(int divisor, int xtal)
refresh = HZ_TO_ATTOSECONDS(pixel_clock) * (hblank_period) * vblank_period;
machine().first_screen()->configure((hblank_period), (vblank_period), visarea, refresh );
//popmessage("%d %d\n",vga.crtc.horz_total * 8,vga.crtc.vert_total);
m_vblank_timer->adjust( machine().first_screen()->time_until_pos(vga.crtc.vert_blank_start + vga.crtc.vert_blank_end) );
m_vblank_timer->adjust( machine().first_screen()->time_until_pos(vga.crtc.vert_blank_start) );
}
void vga_device::recompute_params()
@ -1489,7 +1489,6 @@ void vga_device::crtc_reg_write(uint8_t index, uint8_t data)
break;
case 0x0c:
case 0x0d:
if(machine().first_screen()->vpos() < (vga.crtc.vert_retrace_start)) break;
vga.crtc.start_addr_latch &= ~(0xff << (((index & 1)^1) * 8));
vga.crtc.start_addr_latch |= (data << (((index & 1)^1) * 8));
break;