mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 18:25:35 -04:00
Alexandros Mandravillis
17 lines
684 B
C
17 lines
684 B
C
#ifndef PSX_GPU_INTERLACE_H
|
|
#define PSX_GPU_INTERLACE_H
|
|
|
|
/* GP0 raster primitives skip the active field only in 480i mode with
|
|
* drawing-to-display prohibited. VRAM transfer commands do not use this rule.
|
|
* Return -1 for progressive drawing, otherwise the native VRAM row parity
|
|
* that must remain unchanged. The display origin participates in that parity. */
|
|
static inline int psx_gpu_raster_skipped_row(unsigned interlace,
|
|
unsigned high_vertical_resolution, unsigned draw_to_display,
|
|
unsigned display_y, unsigned field) {
|
|
if (!interlace || !high_vertical_resolution || draw_to_display)
|
|
return -1;
|
|
return (int)((display_y + field) & 1u);
|
|
}
|
|
|
|
#endif
|