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GPU: Further refinements to crop overscan

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Fixes flickering line in South Park.
This commit is contained in:
Connor McLaughlin 2020-05-17 19:23:46 +10:00
parent 0ef0c36704
commit 19cebd97da
1 changed files with 14 additions and 10 deletions
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24
src/core/gpu.cpp
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@ -505,36 +505,40 @@ void GPU::UpdateCRTCDisplayParameters()
// Determine if we need to adjust the VRAM rectangle (because the display is starting outside the visible area) or add
// padding.
u16 horizontal_skip_pixels;
if (horizontal_display_start >= cs.horizontal_active_start)
{
cs.display_origin_left = (horizontal_display_start - cs.horizontal_active_start) / cs.dot_clock_divider;
cs.display_vram_left = m_crtc_state.regs.X;
cs.display_vram_left = std::min<u16>(m_crtc_state.regs.X, VRAM_WIDTH - 1);
horizontal_skip_pixels = 0;
}
else
{
horizontal_skip_pixels = (cs.horizontal_active_start - horizontal_display_start) / cs.dot_clock_divider;
cs.display_origin_left = 0;
cs.display_vram_left = std::min<u16>(
m_crtc_state.regs.X + ((cs.horizontal_active_start - horizontal_display_start) / cs.dot_clock_divider),
VRAM_WIDTH - 1);
cs.display_vram_left = std::min<u16>(m_crtc_state.regs.X + horizontal_skip_pixels, VRAM_WIDTH - 1);
}
u16 horizontal_active_ticks;
if (horizontal_display_end <= cs.horizontal_active_end)
{
const u16 active_ticks =
horizontal_active_ticks =
horizontal_display_end -
std::min(horizontal_display_end, std::max(horizontal_display_start, cs.horizontal_active_start));
cs.display_vram_width = ((active_ticks / cs.dot_clock_divider) + 2u) & ~3u;
}
else
{
const u16 active_ticks =
horizontal_active_ticks =
cs.horizontal_active_end -
std::min(cs.horizontal_active_end, std::max(horizontal_display_start, cs.horizontal_active_start));
cs.display_vram_width = ((active_ticks / cs.dot_clock_divider) + 2u) & ~3u;
}
// align to 4-pixel boundary
cs.display_vram_width = ((horizontal_active_ticks / cs.dot_clock_divider) + 2u) & ~3u;
// apply the crop from the start (usually overscan)
cs.display_vram_width -= std::min(cs.display_vram_width, horizontal_skip_pixels);
if (vertical_display_start >= cs.vertical_active_start)
{
cs.display_origin_top = (vertical_display_start - cs.vertical_active_start) << height_shift;