Build system
- Add a single hand-written Makefile (GNU make + gcc, pure C). Builds
raylib from vendored source and links rspektrum with no premake/lua.
Targets: all/run/test/bench/clean; release default, DEBUG=1 for debug;
ARCH overridable (defaults to -march=x86-64-v3).
- Remove premake entirely: rspektrum.make, raylib.make, build/premake5*
binaries, build/premake5.lua, build/ecc/*. The generated top-level
Makefile was gitignored, so hand-edits to it were silently lost.
- Vendor raylib src/ into the repo (was gitignored -> fresh clones could
not build). Commit only src/ (~16MB); examples/projects stay local.
Verified: a build from the git-tracked tree alone succeeds offline.
- Release flags bumped to -O3 -ffast-math with a portable arch baseline
(x86-64-v3 = AVX2+FMA on x64, SSE2 on x86). Confirmed FMA/AVX codegen
in fft.o.
FFT optimization (src/fft.c)
- Precompute twiddle factors and the bit-reversal permutation once per
size, cached as a small plan table (FFTW's idea, lightweight). Removes
the per-butterfly cexpf() and per-element bit-twiddling that dominated.
- 3.6x faster on the mlnl_samples.wav STFT workload (2048-pt, -O2 same
flags both sides): 81us -> 22us per FFT. With the new -O3/-ffast-math/
AVX2 release flags stacked: ~15us (5.5x vs the old -O2 baseline).
- Verified vs a double-precision reference DFT: 1e-6 relative error,
round-trip 2.4e-7. Drop-in: same FFT() signature.
Tests/bench (bench/)
- fft_verify.c: FFT vs reference DFT + round-trip check (make test).
- fft_bench.c: times the real STFT workload (make bench).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
spectrogram.c was ~2950 lines holding everything. Break it into cohesive
translation units; spectrogram.c keeps only globals + the main frame loop.
New modules:
- spectrogram_types.h shared types, constants, extern globals, inline math
- fft.c/.h FFT, bit-reverse, twiddle (standalone, no app deps)
- stft.c/.h STFT compute, adaptive resolution, FFT-size LRU cache
- audio.c/.h WAV/ffmpeg load, FreeSignal, bandpass, playback
- render.c/.h UI scaling, colormaps, texture gen, on-screen drawing
- ui.c/.h file browser, sidebar, sliders, PNG export
Also:
- utils.c now includes utils.h instead of re-typedef'ing AudioSignal/
SignalStats (they had to be hand-synced before).
- Remove dead code: ApplyHannWindow and ComputeSTFTHighResRange were never
called (the live high-res path is ComputeNextHighResChunk).
- Delete the unused raylib-template main.c.
- rspektrum.make: build the new units. premake5.lua: glob src/**.c so a
future regen stays correct.
Pure code movement otherwise; no behavior change. Builds clean (-Wshadow).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Move all Unix-specific syscalls (fork, execvp, waitpid, strerror, /tmp)
into a platform layer so the same spectrogram.c can target Windows
(CreateProcess) and WebAssembly (stubs). Key changes:
- src/platform.h: public API with spawn handle, error codes, path helpers
- src/platform_linux.c: fork/execvp implementation, /tmp, strerror
- src/platform_win32.c: CreateProcess implementation, temp dir lookup
- src/platform_web.c: stub implementations (no subprocess support on web)
- src/spectrogram.c: consume only platform.h; replace pid_t/fork/execvp
with Platform_SpawnChild/WaitForChild; use Platform_GetTempDir() for
/tmp path; replace strdup with malloc/memcpy for portability
- Build: add platform_*.c to gmake, Premake, and build_web.sh
tyler
Jeffery Myers
Peter0x44
staruwos
Mohammed Saad
Isaiah Weidl
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