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GPU: Wrap display VRAM coordinates properly

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This commit is contained in:
Albert Liu 2020-12-14 17:30:02 -08:00
parent 866cbdca4b
commit 1c8a896a55
1 changed files with 3 additions and 3 deletions
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6
src/core/gpu.cpp
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@ -641,14 +641,14 @@ void GPU::UpdateCRTCDisplayParameters()
if (horizontal_display_start >= cs.horizontal_visible_start) if (horizontal_display_start >= cs.horizontal_visible_start)
{ {
cs.display_origin_left = (horizontal_display_start - cs.horizontal_visible_start) / cs.dot_clock_divider; cs.display_origin_left = (horizontal_display_start - cs.horizontal_visible_start) / cs.dot_clock_divider;
cs.display_vram_left = std::min<u16>(cs.regs.X, VRAM_WIDTH - 1); cs.display_vram_left = cs.regs.X;
horizontal_skip_pixels = 0; horizontal_skip_pixels = 0;
} }
else else
{ {
horizontal_skip_pixels = (cs.horizontal_visible_start - horizontal_display_start) / cs.dot_clock_divider; horizontal_skip_pixels = (cs.horizontal_visible_start - horizontal_display_start) / cs.dot_clock_divider;
cs.display_origin_left = 0; cs.display_origin_left = 0;
cs.display_vram_left = std::min<u16>(cs.regs.X + horizontal_skip_pixels, VRAM_WIDTH - 1); cs.display_vram_left = (cs.regs.X + horizontal_skip_pixels) % VRAM_WIDTH;
} }
// apply the crop from the start (usually overscan) // apply the crop from the start (usually overscan)
@ -665,7 +665,7 @@ void GPU::UpdateCRTCDisplayParameters()
else else
{ {
cs.display_origin_top = 0; cs.display_origin_top = 0;
cs.display_vram_top = cs.regs.Y + ((cs.vertical_visible_start - vertical_display_start) << y_shift); cs.display_vram_top = (cs.regs.Y + ((cs.vertical_visible_start - vertical_display_start) << y_shift)) % VRAM_HEIGHT;
} }
if (vertical_display_end <= cs.vertical_visible_end) if (vertical_display_end <= cs.vertical_visible_end)