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ludic.nav (17.10): the time paths take, counted in the shim

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nav_us() gives the microseconds spent in nav_path across the loaded meshes. The shim times each path with the OS's monotonic clock (clock_gettime, or QueryPerformanceCounter from KERNEL32), so the DLL still needs no C++ runtime. Both libraries are rebuilt, and 13 tests pass on the Mac and the PC.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-27 22:41:30 +03:00
parent 297578705e
commit f65eda8b47
9 changed files with 58 additions and 9 deletions
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21
packages/ludic.nav/native/shim/nav_shim.cpp
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@ -17,7 +17,27 @@
#define NAV_SHIM extern "C" __attribute__((visibility("default")))
#endif
#ifdef _WIN32
extern "C" __declspec(dllimport) int __stdcall QueryPerformanceCounter(long long *);
extern "C" __declspec(dllimport) int __stdcall QueryPerformanceFrequency(long long *);
#else
#include <time.h>
#endif
namespace {
// a monotonic clock in nanoseconds, from the OS alone (KERNEL32 on Windows: no C++ runtime to ship)
long long nav_now_ns() {
#ifdef _WIN32
long long c = 0, f = 1;
QueryPerformanceCounter(&c);
QueryPerformanceFrequency(&f);
return (long long)((double)c * 1e9 / (double)f);
#else
struct timespec t;
clock_gettime(CLOCK_MONOTONIC, &t);
return (long long)t.tv_sec * 1000000000LL + t.tv_nsec;
#endif
}
const int NAV_MAX_POLYS = 512; // polygons a path may cross; a longer one is cut there
const int NAV_MAX_NODES = 4096; // the search's open list
const int NAV_FILTERS = 8; // costs per kind of ground: one set per kind of walker's taste
@ -30,6 +50,7 @@ struct Nav {
float ext[3] = {2.0f, 4.0f, 2.0f}; // how far to look for the mesh around a point
dtPolyRef polys[NAV_MAX_POLYS];
int partial = 0; // the last path stopped short of its end
long long ns = 0; // time spent finding paths, for the measure (17.10)
};
// a navmesh with its query, from params (a set of tiles) or from one tile's data