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Fix horizontal window inversion logic.

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This commit is contained in:
David Guillen Fandos 2023-09-19 00:19:26 +02:00
parent 6e59ca6795
commit 1d46986e92
1 changed files with 7 additions and 4 deletions
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11
video.cc
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@ -2190,10 +2190,13 @@ static void render_window_n_pass(u16 *scanline, u32 start, u32 end)
u32 win_bot = read_ioreg(REG_WINxV(winnum)) & 0xFF; u32 win_bot = read_ioreg(REG_WINxV(winnum)) & 0xFF;
// Check the X coordinates and generate up to three segments // Check the X coordinates and generate up to three segments
// Clip the coordinates to the [start, end) range. // Clip the coordinates to the [start, end) range.
u32 win_l = MAX(start, MIN(end, read_ioreg(REG_WINxH(winnum)) >> 8)); u32 win_lraw = read_ioreg(REG_WINxH(winnum)) >> 8;
u32 win_r = MAX(start, MIN(end, read_ioreg(REG_WINxH(winnum)) & 0xFF)); u32 win_rraw = read_ioreg(REG_WINxH(winnum)) & 0xFF;
u32 win_l = MAX(start, MIN(end, win_lraw));
u32 win_r = MAX(start, MIN(end, win_rraw));
bool goodwin = win_lraw < win_rraw;
if (!in_window_y(vcount, win_top, win_bot) || (win_l == win_r)) if (!in_window_y(vcount, win_top, win_bot) || (win_lraw == win_rraw))
// WindowN is completely out, just render all out. // WindowN is completely out, just render all out.
outfn(scanline, start, end); outfn(scanline, start, end);
else { else {
@ -2203,7 +2206,7 @@ static void render_window_n_pass(u16 *scanline, u32 start, u32 end)
u32 wndn_enable = (winin >> (8 * winnum)) & 0x3F; u32 wndn_enable = (winin >> (8 * winnum)) & 0x3F;
// If the window is defined upside down, the areas are inverted. // If the window is defined upside down, the areas are inverted.
if (win_l < win_r) { if (goodwin) {
// Render [start, win_l) range (which is outside the window) // Render [start, win_l) range (which is outside the window)
if (win_l != start) if (win_l != start)
outfn(scanline, start, win_l); outfn(scanline, start, win_l);