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-rw-r--r--src/mame/machine/vsnes.cpp10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/mame/machine/vsnes.cpp b/src/mame/machine/vsnes.cpp
index f7595acba77..317608c8f55 100644
--- a/src/mame/machine/vsnes.cpp
+++ b/src/mame/machine/vsnes.cpp
@@ -375,6 +375,16 @@ WRITE8_MEMBER(vsnes_state::gun_in0_w)
uint8_t realy = (int)y;
+ // update the screen if necessary
+ if (!m_ppu1->screen().vblank())
+ {
+ int vpos = m_ppu1->screen().vpos();
+ int hpos = m_ppu1->screen().hpos();
+
+ if (vpos > realy || (vpos == realy && hpos >= x))
+ m_ppu1->screen().update_now();
+ }
+
/* get the pixel at the gun position */
rgb_t col = m_ppu1->screen().pixel(x, realy);
uint8_t bright = col.brightness();