.c

#include <psp2/kernel/processmgr.h>
#include <psp2/touch.h>
#include <psp2/display.h>
#include <psp2/audioout.h>

#include <stdio.h>
#include <string.h>
#include "debugScreen.h"

#define printf psvDebugScreenPrintf

/* TODO: why touch[port].report[i].force is always at 128 ? */

double gen_sqr(double p){return p>.5?-1.:1.;}
double gen_tri(double p){return p*2;}
double gen_nul(double p){return 0.;}

typedef double (*wav_gen)(double);

void wave_set(int16_t*buffer, size_t size,  wav_gen generator){
	for (size_t smpl = 0; smpl < size; ++smpl){
		buffer[smpl] = 0x7FFF*generator((float)smpl/(float)size);
		printf("sample: %d", buffer[smpl]);
	}
}

int main(int argc, char *argv[]) {
	psvDebugScreenInit();
	wav_gen gen = gen_sqr;
	int vol[] = {SCE_AUDIO_OUT_MAX_VOL,SCE_AUDIO_OUT_MAX_VOL};
	int16_t wave_buf[SCE_AUDIO_MAX_LEN]={0};
	int size = 256;

	printf("swipe to the bottom with 1 finger to stop\n");
	/* should use SCE_TOUCH_SAMPLING_STATE_START instead of 1 but old SDK have an invalid values */
	sceTouchSetSamplingState(SCE_TOUCH_PORT_FRONT, 1);
	sceTouchSetSamplingState(SCE_TOUCH_PORT_BACK, 1);
	sceTouchEnableTouchForce(SCE_TOUCH_PORT_FRONT);
	sceTouchEnableTouchForce(SCE_TOUCH_PORT_BACK);
	
	SceTouchData touch_old[SCE_TOUCH_PORT_MAX_NUM];
	SceTouchData touch[SCE_TOUCH_PORT_MAX_NUM];
	while (1) {
		memcpy(touch_old, touch, sizeof(touch_old));
		printf("\e[0;5H");
		int port,i;
		/* sample both back and front surfaces */
		for(port = 0; port < SCE_TOUCH_PORT_MAX_NUM; port++){
			sceTouchPeek(port, &touch[port], 1);
			printf("%s",((const char*[]){"FRONT","BACK "})[port]);
			/* print every touch coordinates on that surface */
			for(i = 0; i < SCE_TOUCH_MAX_REPORT; i++)
				printf("\e[9%im%4i:%-4i ", (i < touch[port].reportNum)? 7:0,
				       touch[port].report[i].x,touch[port].report[i].y);
			printf("\n");
		}
		int freq = 25*touch[SCE_TOUCH_PORT_FRONT].report[0].x;
		printf("Frequency: %d", freq);
		printf("\n");
		printf("vol0: %d",vol[0]);
		printf("\n");
		printf("vol1: %d",vol[1]); 
		int audioPort = sceAudioOutOpenPort(SCE_AUDIO_OUT_PORT_TYPE_BGM,size,freq,SCE_AUDIO_OUT_MODE_MONO);
		sceAudioOutSetVolume(audioPort, SCE_AUDIO_VOLUME_FLAG_L_CH |SCE_AUDIO_VOLUME_FLAG_R_CH, vol);
		wave_set(wave_buf, size, gen);
		sceAudioOutOutput(audioPort, wave_buf);


		if ( (touch[SCE_TOUCH_PORT_FRONT].reportNum == 1)
		  && (touch_old[SCE_TOUCH_PORT_FRONT].reportNum == 1)
		  && (touch[SCE_TOUCH_PORT_FRONT].report[0].y >= 1000)
		  && (touch_old[SCE_TOUCH_PORT_FRONT].report[0].y < 1000))
		break;
	}
	sceKernelExitProcess(0);
	return 0;
}