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First batch of real HW tests: added proper vblank firing

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This commit is contained in:
Angelo Salese 2013-02-22 15:48:09 +00:00
parent af96c3b896
commit c8c27d6448
1 changed files with 9 additions and 6 deletions
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15
src/emu/video/stvvdp2.c
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@ -5933,6 +5933,7 @@ int saturn_state::get_pixel_clock( void )
return res/divider;
}
/* TODO: hblank position and hblank firing doesn't really match HW behaviour. */
UINT8 saturn_state::get_hblank( void )
{
const rectangle &visarea = machine().primary_screen->visible_area();
@ -5949,10 +5950,7 @@ UINT8 saturn_state::get_vblank( void )
int cur_v,vblank;
cur_v = machine().primary_screen->vpos();
vblank = (m_vdp2.pal) ? 288 : 240;
if((STV_VDP2_LSMD & 3) == 3)
vblank<<=1;
vblank = get_vblank_start_position() * get_ystep_count();
if (cur_v >= vblank)
return 1;
@ -5973,9 +5971,13 @@ UINT8 saturn_state::get_odd_bit( void )
int saturn_state::get_vblank_start_position( void )
{
/* TODO: test says that second setting happens at 241, might need further investigation ... */
const int d_vres[4] = { 224, 240, 256, 256 };
int vres_mask;
int vblank_line;
vblank_line = (m_vdp2.pal) ? 288 : 240;
vres_mask = (m_vdp2.pal << 1)|1; //PAL uses mask 3, NTSC uses mask 1
vblank_line = d_vres[STV_VDP2_VRES & vres_mask];
return vblank_line;
}
@ -6039,7 +6041,8 @@ int saturn_state::get_vcounter( void )
if((STV_VDP2_LSMD & 3) == 3)
return (vcount & ~1) | (machine().primary_screen->frame_number() & 1);
return (vcount << 1); // Non-interlace
/* docs says << 1, but according to HW tests it's a typo. */
return (vcount & 0x1ff); // Non-interlace
}
void saturn_state::stv_vdp2_state_save_postload( void )