mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 10:19:47 -04:00
Alexandros Mandravillis
17 lines
684 B
C
17 lines
684 B
C
#ifndef PSX_GPU_INTERLACE_H
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#define PSX_GPU_INTERLACE_H
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/* GP0 raster primitives skip the active field only in 480i mode with
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* drawing-to-display prohibited. VRAM transfer commands do not use this rule.
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* Return -1 for progressive drawing, otherwise the native VRAM row parity
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* that must remain unchanged. The display origin participates in that parity. */
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static inline int psx_gpu_raster_skipped_row(unsigned interlace,
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unsigned high_vertical_resolution, unsigned draw_to_display,
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unsigned display_y, unsigned field) {
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if (!interlace || !high_vertical_resolution || draw_to_display)
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return -1;
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return (int)((display_y + field) & 1u);
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}
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#endif
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