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GPU: Use start address in computation of drawing_even_line

This commit is contained in:
Connor McLaughlin 2019-12-08 00:40:52 +10:00
parent 42ee55ae17
commit 8930383c96
1 changed files with 12 additions and 12 deletions
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24
src/core/gpu.cpp
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@ -208,12 +208,7 @@ u32 GPU::ReadRegister(u32 offset)
return ReadGPUREAD();
case 0x04:
{
// Bit 31 of GPUSTAT is always clear during vblank.
u32 bits = m_GPUSTAT.bits;
bits &= ~(BoolToUInt32(m_crtc_state.in_vblank) << 31);
return bits;
}
return m_GPUSTAT.bits;
default:
Log_ErrorPrintf("Unhandled register read: %02X", offset);
@ -407,10 +402,7 @@ void GPU::Execute(TickCount ticks)
if (m_GPUSTAT.vertical_interlace)
{
m_GPUSTAT.interlaced_field ^= true;
m_crtc_state.current_scanline = BoolToUInt32(m_GPUSTAT.interlaced_field);
if (m_GPUSTAT.vertical_resolution)
m_GPUSTAT.drawing_even_line = m_GPUSTAT.interlaced_field;
m_crtc_state.current_scanline = BoolToUInt32(!m_GPUSTAT.interlaced_field);
}
else
{
@ -439,8 +431,16 @@ void GPU::Execute(TickCount ticks)
}
// alternating even line bit in 240-line mode
if (!m_GPUSTAT.In480iMode())
m_GPUSTAT.drawing_even_line = ConvertToBoolUnchecked(m_crtc_state.current_scanline & u32(1));
if (m_GPUSTAT.In480iMode())
{
m_GPUSTAT.drawing_even_line =
ConvertToBoolUnchecked((m_crtc_state.regs.Y + BoolToUInt32(!m_GPUSTAT.interlaced_field)) & u32(1));
}
else
{
m_GPUSTAT.drawing_even_line =
ConvertToBoolUnchecked(m_crtc_state.regs.Y + m_crtc_state.current_scanline & u32(1));
}
}
const bool new_hblank = m_crtc_state.current_tick_in_scanline < m_crtc_state.horizontal_display_start ||