mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 18:25:35 -04:00
Matthew Stanley
fe42da2744
Keeps both lines: master's PGXP session, draw-distance clamps, masked rejects and saturated-winding NCLIP; the release's render-pass kit additions, verified media/disc extents, timeline/present rings, cull-scale sites. Overlay ABI v30. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
29 lines
1.3 KiB
C
29 lines
1.3 KiB
C
#ifndef PSX_WS_BACKDROP_MARGIN_H
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#define PSX_WS_BACKDROP_MARGIN_H
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#include <stdint.h>
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/* Round outward: even a partial newly visible column must be submitted. The
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* caller includes its screen-space guard in reveal_pixels. The guest's own
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* row clamps still enforce finite level bounds. */
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static inline int psx_ws_backdrop_columns(int window_columns, int reveal_pixels,
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int native_width) {
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if (window_columns <= 0 || reveal_pixels <= 0 || native_width <= 0) return 0;
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int64_t columns = ((int64_t)window_columns * reveal_pixels + native_width - 1)
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/ native_width;
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/* The detector's consumers narrow to signed 16-bit indices. More than
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* 0x3fff extra columns cannot reveal anything further in byte-count rows. */
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return columns > 0x3fff ? 0x3fff : (int)columns;
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}
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/* Some segmented rows clamp START before their final table bias. Widening
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* that final bound must not bypass index zero or wrap the signed-16-bit END
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* before the guest's finite-table upper clamp executes. */
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static inline uint32_t psx_ws_backdrop_bound(uint32_t orig, int is_end, int margin) {
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int64_t value = (int32_t)orig;
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value += is_end ? margin : -margin;
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if (value < 0) value = 0;
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if (value > 0x7fff) value = 0x7fff;
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return (uint32_t)value;
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}
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#endif
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