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https://github.com/RetroPortingToolKit/psxrecomp
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tetrisgm
69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
#ifndef PGXP_VERTEX_CACHE_H
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#define PGXP_VERTEX_CACHE_H
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/* Frame-local canonicalization for PGXP screen vertices.
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*
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* A GP0 primitive is submitted immediately, so a later neighbour cannot
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* retroactively change an already-rasterized edge. The first occurrence of
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* an integer screen vertex therefore chooses the frame's canonical position;
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* every later occurrence of the same packet vertex uses that exact 16.16
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* position, whether its own PGXP lookup succeeded or failed. The source word
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* address is part of the identity: two independent vertices that happen to
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* land on one native pixel must not inherit one another's fraction.
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*/
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define PGXP_VERTEX_CACHE_CAPACITY 65536u
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typedef struct PgxpVertexCacheEntry {
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uint64_t frame;
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uint32_t source_addr;
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uint32_t _pad0;
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int32_t native_x;
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int32_t native_y;
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int32_t canonical_x16;
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int32_t canonical_y16;
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uint8_t occupied;
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uint8_t canonical_precise;
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uint8_t _pad[6];
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} PgxpVertexCacheEntry;
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typedef struct PgxpVertexCache {
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PgxpVertexCacheEntry entries[PGXP_VERTEX_CACHE_CAPACITY];
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} PgxpVertexCache;
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/* Drop all frame-local canonical positions. This is required whenever the
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* emulated timeline jumps (reset or savestate restore); the frame counter is
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* not itself a sufficient epoch after a rewind. */
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void pgxp_vertex_cache_reset(PgxpVertexCache *cache);
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enum {
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PGXP_VERTEX_CACHE_INSERTED = 0,
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PGXP_VERTEX_CACHE_REUSED = 1,
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PGXP_VERTEX_CACHE_OVERFLOW = 2,
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};
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/* Resolve one final (post-offset/post-widescreen) integer vertex. On first
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* sight of a source word in a frame, candidate_x/y become canonical when
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* candidate_precise is true; otherwise the native integer position is
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* canonical. Repeated source/native keys return the first position exactly. */
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int pgxp_vertex_cache_resolve(PgxpVertexCache *cache, uint64_t frame,
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uint32_t source_addr,
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int32_t native_x, int32_t native_y,
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int candidate_precise,
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int32_t candidate_x16,
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int32_t candidate_y16, int32_t *out_x16,
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int32_t *out_y16,
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int *out_canonical_precise);
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#ifdef __cplusplus
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}
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#endif
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#endif /* PGXP_VERTEX_CACHE_H */
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