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model2.cpp: added 30 Hz renderer mode, fixes Virtua Striker timings [Angelo Salese]

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This commit is contained in:
angelosa 2018-02-19 14:23:48 +01:00
parent 2e069bba3a
commit b85cedc718
2 changed files with 16 additions and 2 deletions
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15
src/mame/drivers/model2.cpp
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@ -550,7 +550,14 @@ READ32_MEMBER(model2_state::fifoctl_r)
READ32_MEMBER(model2_state::videoctl_r)
{
return ((m_screen->frame_number() & 1) << 2) | (m_videocontrol & 3);
uint8_t framenum;
if(m_render_mode == false)
framenum = (m_screen->frame_number() & 2) << 1;
else
framenum = (m_screen->frame_number() & 1) << 2;
return (framenum) | (m_videocontrol & 3);
}
WRITE32_MEMBER(model2_state::videoctl_w)
@ -1387,7 +1394,11 @@ WRITE32_MEMBER(model2_state::copro_w)
WRITE32_MEMBER(model2_state::mode_w)
{
osd_printf_debug("Mode = %08X\n", data);
// ---- -x-- (1) 60 Hz mode
// (0) 30 Hz mode - skytargt, desert, vstriker, vcop
// ---- ---x Test Mode (Host can "access memories that are always being reloaded")
m_render_mode = bool(BIT(data,2));
// osd_printf_debug("Mode = %08X\n", data);
}
WRITE32_MEMBER(model2_state::model2o_tex_w0)

3
src/mame/includes/model2.h
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@ -292,6 +292,9 @@ public:
protected:
virtual void video_start() override;
private:
bool m_render_mode;
};