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ms1_tmap.cpp: initialize VRAM to sane default, fixes ugly back pen shown up in Big Run [Angelo Salese]

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angelosa 2018-06-14 16:28:06 +02:00
parent c0f052599e
commit d5e347054b
2 changed files with 11 additions and 0 deletions
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10
src/mame/video/ms1_tmap.cpp
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@ -129,6 +129,16 @@ void megasys1_tilemap_device::device_start()
save_item(NAME(m_scroll_flag)); save_item(NAME(m_scroll_flag));
} }
void megasys1_tilemap_device::device_reset()
{
// Big Run never sets up scrollram past 0x1000
// this causes its opaque pen to show up when the game scrolls vertically after a bump.
// we initialize the device VRAM to a sane default so that this doesn't occur.
// TODO: might be something else (smaller VRAM size?)
for(int i=0;i<m_scrollram.bytes()/2;i++)
m_scrollram[i] = 0xffff;
}
void megasys1_tilemap_device::device_post_load() void megasys1_tilemap_device::device_post_load()
{ {
m_tmap = m_tilemap[(m_scroll_flag >> 4) & 1][m_scroll_flag & 3]; m_tmap = m_tilemap[(m_scroll_flag >> 4) & 1][m_scroll_flag & 3];

1
src/mame/video/ms1_tmap.h
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@ -66,6 +66,7 @@ public:
protected: protected:
// device-level overrides // device-level overrides
virtual void device_start() override; virtual void device_start() override;
virtual void device_reset() override;
virtual void device_post_load() override; virtual void device_post_load() override;
private: private: