examples/sinewave.c


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#if 0 /*
#/  ================================================================
#/
#/    sinewave.c
#/
#/  ================================================================
#/
#/    Self-compilation shell script
#/
SRC=${0##*./}
BIN=${SRC%.*}
gcc                                 \
  -Wall -Wextra -Werror -pedantic   \
  -Wno-old-style-declaration        \
  -Wno-missing-braces               \
  -Wno-unused-variable              \
  -Wno-unused-but-set-variable      \
  -Wno-unused-parameter             \
  -Wno-overlength-strings           \
  -O3                               \
  -fsanitize=undefined,address,leak \
  -lX11 -lm -lasound                \
  -o $BIN $SRC &&                   \
  ./$BIN $@ && rm $BIN
exit $? # */
#endif

#include "../reduced_system_layer.c"

void update_and_render_frame(void) {
  //  Nothing
}

i32 main(i32 argc, c8 **argv) {
  (void) argc;
  (void) argv;

  platform.graceful_exit = 1;

  f64 frequency = 440. * 4;

  f32 frames[AUDIO_SAMPLE_RATE * AUDIO_NUM_CHANNELS];
  for (i64 i = 0; i < AUDIO_SAMPLE_RATE; ++i) {
    f64 t = ((f64) i) / AUDIO_SAMPLE_RATE;
    f64 x = sin(t * frequency);
    if (t < .1)
      x *= t / .1;
    if (t > .7)
      x *= (1. - t) / .3;
    frames[i * 2]     = (f32) x * .5;
    frames[i * 2 + 1] = (f32) x * .5;
  }

  p_queue_sound(0, AUDIO_SAMPLE_RATE, frames);
  p_handle_audio(AUDIO_SAMPLE_RATE);
  p_cleanup();
  return 0;
}