gistfile1.c

void lipsynth_module_sine_update(void *self, lipsynth_context *ctx, lipsynth_AudioMemory *outputBuffer){
    lipsynth_module_sine* module = self;
    // fill up the output buffer with a sine wave!
    for(int i=0;i<ctx->bufferLength/2;i++){
        // must be called before any parameters are read
        if(module->_(lipsynth_Module_update_parameters)(self, ctx)){
            if(module->_(lipsynth_Module_has_parameter_value)(self, ctx, NOTE)){
                int noteVal = module->_(lipsynth_Module_get_parameter_value)(self, ctx, NOTE);
                module->freqVal = pow(2.0, (noteVal)/12.0f)*440.0f;
            }
        }
        module->sineCounter += 1.0f/44100.0f*module->freqVal;
        module->sineCounter = module->sineCounter-floorf(module->sineCounter);
        outputBuffer->data[i*2] = outputBuffer->data[i*2+1] = sinf(module->sineCounter*M_PI);
    }
}