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Fixed incorrect calculation in rendering timing. Fixes some of the issues in Prehistorik Man (and doesn’t break GBVideoPlayer)

This commit is contained in:
Lior Halphon 2017-05-31 23:58:14 +03:00
parent 81de2c3d9b
commit 22ee6f6ca2
1 changed files with 2 additions and 1 deletions
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3
Core/display.c
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@ -508,7 +508,8 @@ void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
/* Render */
int16_t current_lcdc_x = ((gb->display_cycles % LINE_LENGTH - MODE2_LENGTH) & ~7) - (gb->effective_scx & 0x7);
/* Todo: it appears that the actual rendering starts 4 cycles after mode 3 starts. Is this correct? */
int16_t current_lcdc_x = gb->display_cycles % LINE_LENGTH - MODE2_LENGTH - (gb->effective_scx & 0x7) - 4;
for (;gb->previous_lcdc_x < current_lcdc_x; gb->previous_lcdc_x++) {
if (gb->previous_lcdc_x >= WIDTH) {