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[Core/VDP] allow active screen width to be modified during first two lines (Bugs Bunny in Double Trouble)

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EkeEke 2017-09-20 16:45:50 +02:00
parent 527fd6ecd8
commit 94103569ff
4 changed files with 10 additions and 6 deletions
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builds/genesis_plus_gx_libretro.dll
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16
core/vdp_ctrl.c
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@ -1997,26 +1997,30 @@ static void vdp_reg_w(unsigned int r, unsigned int d, unsigned int cycles)
fifo_timing = (int *)fifo_timing_h32;
}
/* Update active screen width */
/* Active screen width modified during VBLANK will be applied on upcoming frame */
if (v_counter >= bitmap.viewport.h)
{
/* Active screen width modified during VBLANK will be applied on upcoming frame */
bitmap.viewport.w = max_sprite_pixels;
}
else if ((v_counter == 0) && (cycles <= (mcycles_vdp + 860)))
/* Allow active screen width to be modified during first two lines (Bugs Bunny in Double Trouble) */
else if (v_counter <= 1)
{
/* Active screen width modified during first line HBLANK (Bugs Bunny in Double Trouble) */
bitmap.viewport.w = max_sprite_pixels;
/* Redraw first line */
/* Redraw lines */
render_line(0);
if (v_counter)
{
render_line(1);
}
}
else
{
/* Screen width changes during active display (Golden Axe 3 intro, Ultraverse Prime) */
/* should be applied on next frame since backend rendered framebuffer width is fixed */
/* and can not be modified mid-frame. This is not 100% accurate but games generally */
/* do this where the screen is blanked so it is likely unnoticeable. */
/* do this when the screen is blanked so it is likely unnoticeable. */
bitmap.viewport.changed |= 2;
}
}