convotest/main.c

#include<assert.h>
#include<inttypes.h>
#include<stdbool.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<time.h>
#include<SDL2/SDL.h>
#include<SDL2/SDL_ttf.h>
#include<SDL2/SDL_image.h>

#include"sy.h"
#include"wav.h"
#include"button.h"
#include"tools.h"

#define max(x,y) (((x)>(y))?(x):(y))
#define min(x,y) (((x)<(y))?(x):(y))

#define WIDTH 320
#define HEIGHT 240

enum{BLP,BNS,BTR,BSQ,BSN};

int main(void)
{
	SDL_Event event;
	SDL_Renderer*ren=NULL;
	SDL_Window*win=NULL;
	TTF_Font*font=NULL;
	Button buttons[16];
	bool running=true;
	const size_t samplerate=44100;
	const size_t waveform_size=1024;
	float waveform[waveform_size];
	size_t filt_cutoff=500;
	size_t nbuttons=0;
	size_t osc_freq=440;

	// Init SDL2
	if(SDL_Init(SDL_INIT_EVERYTHING)<0)
	{
		fprintf(stderr,"error: failed to initialize SDL2\n");
		goto quit;
	}

	// Init TTF
	TTF_Init();
	font=TTF_OpenFont("DejaVuSerif.ttf",12);
	if(!font)
	{
		fprintf(stderr,"error: failed initialize SDL2 TTF\n");
		goto quit;
	}

	// Create window
	win=SDL_CreateWindow("ok",SDL_WINDOWPOS_UNDEFINED,
			SDL_WINDOWPOS_UNDEFINED,
			WIDTH,HEIGHT,0);
	if(!win)
	{
		fprintf(stderr,"error: failed to create window\n");
		goto quit;
	}

	// Create renderer
	ren=SDL_CreateRenderer(win,-1,0);
	if(!ren)
	{
		fprintf(stderr,"error: failed to create renderer\n");
		goto quit;
	}

	// Clear window
	SDL_SetRenderDrawColor(ren,0,0,0,0);
	SDL_RenderClear(ren);
	SDL_RenderPresent(ren);

	// Create buttons
#define create_button(n,_label) do{buttons[n]=(Button){.label=(_label),.x=nbuttons*25+5,.y=HEIGHT-20,.w=20,.h=16};++nbuttons;}while(0)
	create_button(BLP,"LP");
	create_button(BNS,"Ns");
	create_button(BTR,"Tr");
	create_button(BSQ,"Sq");
	create_button(BSN,"Sn");
#undef create_button

	// Initialize data
	srand(time(NULL));
	nois(waveform,waveform_size);

	// Main loop
	while(running)
	{
		if(SDL_PollEvent(&event))
		{
			switch(event.type)
			{

				case SDL_QUIT:
					running=false;
					break;

					// Mouse input
				case SDL_MOUSEBUTTONDOWN:
					switch(event.button.button)
					{

						case SDL_BUTTON_LEFT:

							// Check each button
							for(size_t i=0;i<nbuttons;++i)
								if(event.button.x>(int)buttons[i].x&&
										event.button.x<(int)buttons[i].x+(int)buttons[i].w&&
										event.button.y>(int)buttons[i].y&&
										event.button.y<(int)buttons[i].y+(int)buttons[i].h)
								{
									switch(i)
									{

										case BLP:
											float windowsize=(((float)samplerate)/filt_cutoff);
											/* printf("%luHz: %g\n",filt_cutoff,windowsize); */
											/* printf("%luHz(44.1kHz): %g\n",filt_cutoff,((float)44100)/filt_cutoff); */
											avgwindow(waveform,waveform_size,windowsize);
											break;
										case BNS:nois(waveform,waveform_size);break;
										case BTR:tri(waveform,waveform_size,osc_freq);break;
										case BSQ:sq(waveform,waveform_size,osc_freq);break;
										case BSN:sn(waveform,waveform_size,osc_freq);break;

									}
									/* printf("'%s' pressed\n",buttons[i].label); */
									break; // Do not click more than one button
								}
							break;

					}
					break;

					// Keyboard input
				case SDL_KEYDOWN:
					switch(event.key.keysym.sym)
					{

							// UI
						case SDLK_ESCAPE:
						case SDLK_q:
							running=false;
							break;

							// Oscillators
						case SDLK_n:nois(waveform,waveform_size);break;
						case SDLK_t:tri(waveform,waveform_size,osc_freq);break;
						case SDLK_e:sq(waveform,waveform_size,osc_freq);break;
						case SDLK_i:sn(waveform,waveform_size,osc_freq);break;

							// Filters, envelopes, etc.
						case SDLK_s:sort(waveform,waveform_size);break;
						case SDLK_r:shuf(waveform,waveform_size);break;
						case SDLK_y:atk(waveform,waveform_size,5);break;
						case SDLK_u:rel(waveform,waveform_size,10);break;
						case SDLK_o:rotl(waveform,waveform_size);break;
						case SDLK_a:
							{
								float windowsize=(((float)samplerate)/filt_cutoff);
								/* printf("%luHz: %g\n",filt_cutoff,windowsize); */
								/* printf("%luHz(44.1kHz): %g\n",filt_cutoff,((float)44100)/filt_cutoff); */
								avgwindow(waveform,waveform_size,windowsize);
							}
							break;

							// Parameters
						case SDLK_UP:osc_freq+=(1/12.0)*osc_freq;break;
						case SDLK_DOWN:osc_freq-=(1/12.0)*osc_freq;if(osc_freq<1)osc_freq=1;break;
						case SDLK_EQUALS:filt_cutoff+=(1/12.0)*filt_cutoff;break;
						case SDLK_MINUS:filt_cutoff-=(1/12.0)*filt_cutoff;if(filt_cutoff<1)filt_cutoff=1;break;

					}
					break;

				default:
					break;
			}
		}

		// Render
		SDL_SetRenderDrawColor(ren,0,0,0,255);
		SDL_RenderClear(ren);
		SDL_SetRenderDrawColor(ren,255,0,0,255);

		for(size_t i=0;i<WIDTH;++i)
			SDL_RenderDrawLine(ren,i,HEIGHT/2,i,max(HEIGHT/2-waveform[i*(waveform_size/WIDTH)]*100,0));

		for(size_t i=0;i<nbuttons;++i)
			button_draw(ren,font,&buttons[i]);

		ttfprintf(ren,font,0xffffff,5,5,
				"sr:%lu  ns:%lu  f:%lu  co:%lu",
				samplerate,
				waveform_size,
				osc_freq,
				filt_cutoff
				);

		SDL_RenderPresent(ren);
		SDL_Delay(20);
		//usleep(20000);
	}

	// Clean up, exit
quit:
	if(win)
		SDL_DestroyWindow(win);
	if(ren)
		SDL_DestroyRenderer(ren);
	if(font)
		TTF_CloseFont(font);
	SDL_Quit();
	TTF_Quit();
}