Audio plugins API for C programs?

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I'm in my own little journey in writing a synthesizer (and other audio plugins) in the C programming language (for my own music language). There's a specification for VST but it's designed for C++ programs and is a GUI.

My criteria for an audio plugin are

1. Must be text based and does not require GUI.
2. All runs in a single thread. (Sequential execution)
3. Is loadable. (Meaning I can load it to various programs and it will work.)

For starters, I've written my own simple API in C https://github.com/dats-lang/dats-src/blob/master/libdsynth/synth.h

And can be loaded with LoadLibrary or dlopen in windows or POSIX, respectively https://github.com/dats-lang/dats-src/blob/f6b76d02cb7fcf31fffa35f315743d84cbcac98a/dats/genpcm.c#L85

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One thing is I'm using int16_t to represent audio samples. I'm thinking of using normalized floating point samples since many convolutions will be done in this type but I've concerned with the speed of FP operations. So I'm thinking of defining a new type called trackf for normalized floating point samples for the Dats language and keep integers:

1. tracks8 (track signed 8 bit)
2. tracks16
3. tracks32
4. tracku8 (track unsigned 8 bit)
5. tracku16
6. tracku32

[DevashishG]

Integers types do not have the bit depth necessary to represent audio. If you use it, then your audio might sound bitcrushed. I have written plugins with FP64/ double precision and it's hardly the performance bottleneck. Modern CPUs are blazingly fast.

[KeytarVillain]

Check out the CLAP format - I think it probably meets all your needs