mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Matthew Stanley
29 lines
1.1 KiB
C
29 lines
1.1 KiB
C
#ifndef PSX_WS_SCENE_LATCH_H
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#define PSX_WS_SCENE_LATCH_H
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#include <stdint.h>
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/* Overhang proves there is revealable world content. Projection activity can
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* maintain that proof, but MUST NOT establish it: 2D room jingles also use GTE.
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* The CPU/GTE can build a frame across multiple vblanks before submitting any
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* terrain packets, so gaps in GP0 overhang are not evidence of a scene change. */
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typedef struct {
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uint32_t last_frame, last_activity;
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int initialized, confirmed;
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} WsSceneLatch;
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static inline int ws_scene_is_2d(WsSceneLatch* state, uint32_t frame,
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int confirmed_overhang, int projecting_world,
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uint32_t grace) {
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if (state->initialized && (int32_t)(frame - state->last_frame) < 0)
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state->confirmed = 0;
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state->initialized = 1;
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state->last_frame = frame;
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if (confirmed_overhang) state->confirmed = 1;
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if (confirmed_overhang || (state->confirmed && projecting_world))
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state->last_activity = frame;
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if (state->confirmed && frame - state->last_activity > grace)
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state->confirmed = 0;
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return !state->confirmed;
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}
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#endif
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