mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 10:19:47 -04:00
Matthew Stanley
45 lines
1.7 KiB
C
45 lines
1.7 KiB
C
#ifndef PSX_NETPLAY_CONTENT_GATE_H
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#define PSX_NETPLAY_CONTENT_GATE_H
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#include <stdint.h>
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#include <string.h>
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#define NP_CONTENT_MAGIC 0x504D4431u /* PMD1: full 256-bit plan, four fragments */
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typedef struct NpContentGate {
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uint32_t words[8], occupied, matched, acknowledged;
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uint8_t chunks[9], enabled, mismatch, local;
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} NpContentGate;
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static int np_content_init(NpContentGate *g, const char *hex, uint32_t occupied, int local) {
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unsigned i;
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memset(g, 0, sizeof(*g));
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if (!hex || !hex[0]) return 1;
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if (strlen(hex) != 64 || local < 0 || local >= 9 || (occupied & ~0x1ffu)) return 0;
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for (i=0;i<64;++i) {
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unsigned c=(unsigned char)hex[i], v;
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if(c>='0' && c<='9') v=c-'0';
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else if(c>='a' && c<='f') v=c-'a'+10;
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else if(c>='A' && c<='F') v=c-'A'+10;
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else return 0;
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g->words[i/8]=(g->words[i/8]<<4)|v;
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}
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g->enabled=1;g->local=(uint8_t)local;
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g->occupied=occupied|(1u<<local);g->matched=1u<<local;
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return 1;
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}
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static void np_content_note(NpContentGate *g, unsigned slot, unsigned flags,
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uint32_t a, uint32_t b, uint32_t seen) {
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unsigned chunk=flags&3u; uint32_t bit;
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if(!g->enabled || slot>=9 || slot==g->local) return;
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bit=1u<<slot;
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if(!(g->occupied&bit)) return;
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if((flags&0x80u) || a!=g->words[chunk*2] || b!=g->words[chunk*2+1]) {
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g->mismatch=1;return;
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}
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g->chunks[slot]|=(uint8_t)(1u<<chunk);
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if(g->chunks[slot]==15) g->matched|=bit;
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if((seen&g->occupied)==g->occupied) g->acknowledged|=bit;
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}
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static int np_content_ready(const NpContentGate *g) {
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return !g->enabled || (!g->mismatch && g->matched==g->occupied &&
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((g->acknowledged|(1u<<g->local))&g->occupied)==g->occupied);
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}
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#endif
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