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[Core/VDP] fixed first frame VINT occurrence

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This commit is contained in:
EkeEke 2016-10-15 14:07:50 +02:00
parent 2a410a66a9
commit 1f169d76e5
1 changed files with 56 additions and 48 deletions
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104
core/system.c
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@ -434,13 +434,10 @@ void system_frame_gen(int do_skip)
} }
} }
/* initialize VCounter */
v_counter = bitmap.viewport.h;
/* first line of overscan */ /* first line of overscan */
if (bitmap.viewport.y) if (bitmap.viewport.y)
{ {
blank_line(v_counter, -bitmap.viewport.x, bitmap.viewport.w + 2*bitmap.viewport.x); blank_line(bitmap.viewport.h, -bitmap.viewport.x, bitmap.viewport.w + 2*bitmap.viewport.x);
} }
/* clear DMA Busy, FIFO FULL & field flags */ /* clear DMA Busy, FIFO FULL & field flags */
@ -481,31 +478,38 @@ void system_frame_gen(int do_skip)
/* refresh inputs just before VINT (Warriors of Eternal Sun) */ /* refresh inputs just before VINT (Warriors of Eternal Sun) */
osd_input_update(); osd_input_update();
/* delay between VBLANK flag & Vertical Interrupt (Dracula, OutRunners, VR Troopers) */ /* VDP always starts after VBLANK so VINT cannot occur on first frame after a VDP reset (verified on real hardware) */
m68k_run(788); if (v_counter != bitmap.viewport.h)
if (zstate == 1)
{ {
z80_run(788); /* reinitialize VCounter */
} v_counter = bitmap.viewport.h;
else
{
Z80.cycles = 788;
}
/* set VINT flag */ /* delay between VBLANK flag & Vertical Interrupt (Dracula, OutRunners, VR Troopers) */
status |= 0x80; m68k_run(788);
if (zstate == 1)
{
z80_run(788);
}
else
{
Z80.cycles = 788;
}
/* Vertical Interrupt */ /* set VINT flag */
vint_pending = 0x20; status |= 0x80;
if (reg[1] & 0x20)
{ /* Vertical Interrupt */
/* level 6 interrupt */ vint_pending = 0x20;
m68k_set_irq(6); if (reg[1] & 0x20)
{
/* level 6 interrupt */
m68k_set_irq(6);
}
/* assert Z80 interrupt */
Z80.irq_state = ASSERT_LINE;
} }
/* assert Z80 interrupt */
Z80.irq_state = ASSERT_LINE;
/* run 68k & Z80 until end of line */ /* run 68k & Z80 until end of line */
m68k_run(MCYCLES_PER_LINE); m68k_run(MCYCLES_PER_LINE);
if (zstate == 1) if (zstate == 1)
@ -789,13 +793,10 @@ void system_frame_scd(int do_skip)
} }
} }
/* initialize VCounter */
v_counter = bitmap.viewport.h;
/* first line of overscan */ /* first line of overscan */
if (bitmap.viewport.y) if (bitmap.viewport.y)
{ {
blank_line(v_counter, -bitmap.viewport.x, bitmap.viewport.w + 2*bitmap.viewport.x); blank_line(bitmap.viewport.h, -bitmap.viewport.x, bitmap.viewport.w + 2*bitmap.viewport.x);
} }
/* clear DMA Busy, FIFO FULL & field flags */ /* clear DMA Busy, FIFO FULL & field flags */
@ -836,31 +837,38 @@ void system_frame_scd(int do_skip)
/* refresh inputs just before VINT */ /* refresh inputs just before VINT */
osd_input_update(); osd_input_update();
/* delay between VBLANK flag & Vertical Interrupt (Dracula, OutRunners, VR Troopers) */ /* VDP always starts after VBLANK so VINT cannot occur on first frame after a VDP reset (verified on real hardware) */
m68k_run(788); if (v_counter != bitmap.viewport.h)
if (zstate == 1)
{ {
z80_run(788); /* reinitialize VCounter */
} v_counter = bitmap.viewport.h;
else
{
Z80.cycles = 788;
}
/* set VINT flag */ /* delay between VBLANK flag & Vertical Interrupt (Dracula, OutRunners, VR Troopers) */
status |= 0x80; m68k_run(788);
if (zstate == 1)
{
z80_run(788);
}
else
{
Z80.cycles = 788;
}
/* Vertical Interrupt */ /* set VINT flag */
vint_pending = 0x20; status |= 0x80;
if (reg[1] & 0x20)
{ /* Vertical Interrupt */
/* level 6 interrupt */ vint_pending = 0x20;
m68k_set_irq(6); if (reg[1] & 0x20)
{
/* level 6 interrupt */
m68k_set_irq(6);
}
/* assert Z80 interrupt */
Z80.irq_state = ASSERT_LINE;
} }
/* assert Z80 interrupt */
Z80.irq_state = ASSERT_LINE;
/* run both 68k & CD hardware until end of line */ /* run both 68k & CD hardware until end of line */
scd_update(MCYCLES_PER_LINE); scd_update(MCYCLES_PER_LINE);