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main.c
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main.c
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/*
James William Fletcher (github.com/mrbid)
September 2021
Borg ER-0
*/
#include <SDL2/SDL.h>
#include <stdio.h>
#include <math.h>
#ifdef __linux__
#include <sys/stat.h>
#endif
#include "sdl_extra.h"
#include "synth.h"
#include "res.h"
#define TOTAL_DIALS 2
#define SAMPLE_RATE 44100
#define MAXFREQUENCY 1800 //20000
#define MAXAMPLITUDE 255
#define MAXSAMPLELEN 33
SDL_Window *window = NULL;
char *basedir, *appdir;
SDL_Surface* bb; // backbuffer
SDL_Surface* s_bg;
SDL_Surface* s_icon;
Uint32 bgcolor = 0xFFE8A200;
Uint32 outlinecolor = 0xFF000000;
Uint32 scopecolor = 0xFF363636;
Uint32 select_lightness = 44;
Uint32 themeon = 0;
Uint8 select_mode = 0;
Uint8 selected_bank = 0;
Sint32 selected_dial = -1;
Uint8 envelope_enabled = 0;
Uint8 osc_enabled = 0;
SDL_Rect screen_rect = {0, 0, 1069, 283};
SDL_Rect bankl_rect = {4, 265, 12, 14};
SDL_Rect bankr_rect = {64, 265, 12, 14};
SDL_Rect load_rect = {78, 265, 46, 14};
SDL_Rect save_rect = {126, 265, 46, 14};
SDL_Rect secl_rect = {897, 265, 12, 14};
SDL_Rect secr_rect = {957, 265, 12, 14};
SDL_Rect export_rect = {971, 265, 46, 14};
SDL_Rect play_rect = {1019, 265, 46, 14};
SDL_Rect envelope_rect = {4, 4, 800, 258};
SDL_Rect osc_rect = {807, 4, 258, 258};
SDL_Rect dial_rect[2];
float dial_scale[] = {MAXFREQUENCY, MAXAMPLITUDE};
struct ssynth
{
Uint8 seclen;
float osctable[256]; // 0-1
float envelope[798]; // 0-1
float dial_state[2]; // 0-1
};
struct ssynth synth[256];
void saveState()
{
char file[256];
sprintf(file, "%sbank.save", appdir);
FILE* f = fopen(file, "wb");
if(f != NULL)
{
if(fwrite(&synth[0], sizeof(struct ssynth), 256, f) != 256)
printf("fwrite() wrote the wrong amount of bytes, save corrupted.\n");
fclose(f);
}
}
void loadState()
{
char file[256];
sprintf(file, "%sbank.save", appdir);
FILE* f = fopen(file, "rb");
if(f != NULL)
{
unsigned int strikeout = 0;
while(fread(&synth[0], sizeof(struct ssynth), 256, f) != 256)
{
printf("Read bank failed... Trying again.\n");
strikeout++;
if(strikeout > 3333)
{
printf("Loading your data totally failed. ¯\\_(ツ)_/¯ Maybe it's corrupted? :(\n");
break;
}
}
fclose(f);
}
}
void doSynth(Uint8 play)
{
//memset(&sample, 0x00, MAX_SAMPLE);
setSampleLen(synth[selected_bank].seclen);
Uint32 eic = 0;
Uint32 envelope_offset = 0;
const Uint32 samstep = sample_len / (envelope_rect.w-2);
const float r_samstep = 1.f/(float)samstep;
const float reciprocal_sample_rate = 1.f/(float)SAMPLE_RATE;
const float f = synth[selected_bank].dial_state[0] * dial_scale[0];
const float a = synth[selected_bank].dial_state[1] * dial_scale[1];
float phase = 0.f;
float osc = 0.f;
for(int i = 0; i < SAMPLE_RATE*synth[selected_bank].seclen; i++)
{
osc = (oscillator(phase, &synth[selected_bank].osctable[0])-0.5f) * a;
osc *= wlerp(synth[selected_bank].envelope[envelope_offset], synth[selected_bank].envelope[envelope_offset+1], ((float)eic)*r_samstep);
sample[i] = quantise_float(osc);
// step phase
phase += Hz(f)*reciprocal_sample_rate;
// increment envelope stepper
eic++;
if(eic > samstep)
{
eic = 0;
if(envelope_offset < envelope_rect.w-3)
envelope_offset++;
}
}
if(play == 1)
playSample();
}
struct sui
{
Uint8 bankl_hover;
Uint8 bankr_hover;
Uint8 load_hover;
Uint8 save_hover;
Uint8 secl_hover;
Uint8 secr_hover;
Uint8 export_hover;
Uint8 play_hover;
Uint8 dial_hover[2];
};
struct sui ui;
void loadAssets(SDL_Surface* screen)
{
memset(&ui, 0x00, sizeof(struct sui));
memset(&synth, 0x00, sizeof(struct ssynth));
for(int i = 0; i < 256; i++)
{
for(int j = 0; j < envelope_rect.w-2; j++)
synth[i].envelope[j] = 0.5f;
const float su = 6.283185482f / (float)(osc_rect.w-2);
for(int j = 0; j < osc_rect.w-2; j++)
synth[i].osctable[j] = (sinf(su*j)+1.0f)*0.5f;
synth[i].seclen = 3;
synth[i].dial_state[0] = 0.04f;
synth[i].dial_state[1] = 1.f;
}
dial_rect[0] = (SDL_Rect){1011, 12, 19, 19};
dial_rect[1] = (SDL_Rect){1037, 12, 19, 19};
bb = SDL_RGBA32Surface(screen->w, screen->h);
s_bg = surfaceFromData((Uint32*)&bg_image.pixel_data[0], screen->w, screen->h);
s_icon = surfaceFromData((Uint32*)&icon_image.pixel_data[0], 16, 16);
}
void render(SDL_Surface* screen)
{
Uint32 ih = 0; // is hover
char val[256]; // temporary string buffer
// blit bg
SDL_BlitSurface(s_bg, NULL, bb, NULL);
// draw bank selection
if(selected_bank < 10)
{
sprintf(val, "%d", selected_bank);
drawText(bb, val, 38, 267, 0);
}
else if(selected_bank < 100)
{
sprintf(val, "%d", selected_bank);
drawText(bb, val, 35, 267, 0);
}
else
{
sprintf(val, "%d", selected_bank);
drawText(bb, val, 30, 267, 0);
}
// draw sec len
if(synth[selected_bank].seclen < 10)
{
sprintf(val, "%d Sec", synth[selected_bank].seclen);
drawText(bb, val, 919, 267, 0);
}
else if(synth[selected_bank].seclen < 100)
{
sprintf(val, "%d Sec", synth[selected_bank].seclen);
drawText(bb, val, 916, 267, 0);
}
// oscillator
Uint32 eby = osc_rect.y+osc_rect.h-2;
Uint32 ofh = (osc_rect.h-3);
linergb(bb, osc_rect.x, eby-(ofh/2), osc_rect.x, eby-(ofh*synth[selected_bank].osctable[0]), 220, 95, 117);
for(int i = 1; i < osc_rect.w-2; i++)
{
linergb(bb, osc_rect.x+i, eby-(ofh*synth[selected_bank].osctable[i-1]), osc_rect.x+i+1, eby-(ofh*synth[selected_bank].osctable[i]), 220, 95, 117);
}
linergb(bb, osc_rect.x+osc_rect.w-1, eby-(ofh*synth[selected_bank].osctable[osc_rect.w-3]), osc_rect.x+osc_rect.w-1, eby-(ofh/2), 220, 95, 117);
if(osc_enabled == 1)
setColourLightness(bb, osc_rect, scopecolor, 33);
// envelope
eby = envelope_rect.y+envelope_rect.h-2;
for(int i = 0; i < envelope_rect.w-2; i++)
{
linergb(bb, envelope_rect.x+i+1, eby, envelope_rect.x+i+1, eby-((envelope_rect.h-3)*synth[selected_bank].envelope[i]), 220, 95, 117);
}
if(envelope_enabled == 1)
setColourLightness(bb, envelope_rect, scopecolor, 33);
// dial hover & state
const Uint32 hh = dial_rect[0].h/2; // no point making this static (hack: all the same height)
for(int i = 0; i < TOTAL_DIALS; i++)
{
const Uint32 sx = dial_rect[i].x+hh;
const Uint32 sy = dial_rect[i].y+hh;
const float radius = (float)(hh-2);
const float c1 = (cosf(1.570796371f + (synth[selected_bank].dial_state[i] * 6.283185482f)) * radius)+0.5f;
const float s1 = (sinf(1.570796371f + (synth[selected_bank].dial_state[i] * 6.283185482f)) * radius)+0.5f;
const Uint32 ex = sx + c1;
const Uint32 ey = sy + s1;
linergb(bb, sx, sy, ex, ey, 255,255,255);
if(ui.dial_hover[i] == 1)
{
ih=1;
if(i == 0)
sprintf(val, "Frequency: %+.2f", synth[selected_bank].dial_state[i] * dial_scale[i]);
else
sprintf(val, "Amplitude: %+.2f", synth[selected_bank].dial_state[i] * dial_scale[i]);
drawText(bb, val, 811, 249, 1);
if(select_mode == 0)
{
circlergb(bb, dial_rect[i].x+hh, dial_rect[i].y+hh, 10, 108, 108, 108);
circlergb(bb, dial_rect[i].x+hh, dial_rect[i].y+hh, 11, 108, 108, 108);
circlergb(bb, dial_rect[i].x+hh, dial_rect[i].y+hh, 12, 255, 255, 255);
}
else if(select_mode == 1)
{
circlergb(bb, dial_rect[i].x+hh, dial_rect[i].y+hh, 10, 0, 163, 232);
circlergb(bb, dial_rect[i].x+hh, dial_rect[i].y+hh, 11, 0, 163, 232);
circlergb(bb, dial_rect[i].x+hh, dial_rect[i].y+hh, 12, 255, 255, 255);
}
else if(select_mode == 2)
{
circlergb(bb, dial_rect[i].x+hh, dial_rect[i].y+hh, 10, 220, 95, 117);
circlergb(bb, dial_rect[i].x+hh, dial_rect[i].y+hh, 11, 220, 95, 117);
circlergb(bb, dial_rect[i].x+hh, dial_rect[i].y+hh, 12, 255, 255, 255);
}
}
}
// button hover
if(ui.bankl_hover == 1){ih=1; setAreaLightness(bb, bankl_rect, select_lightness);}
else if(ui.bankr_hover == 1){ih=1; setAreaLightness(bb, bankr_rect, select_lightness);}
else if(ui.load_hover == 1){ih=1; setAreaLightness(bb, load_rect, select_lightness);}
else if(ui.save_hover == 1){ih=1; setAreaLightness(bb, save_rect, select_lightness);}
else if(ui.secl_hover == 1){ih=1; setAreaLightness(bb, secl_rect, select_lightness);}
else if(ui.secr_hover == 1){ih=1; setAreaLightness(bb, secr_rect, select_lightness);}
else if(ui.export_hover == 1){ih=1; setAreaLightness(bb, export_rect, select_lightness);}
else if(ui.play_hover == 1){ih=1; setAreaLightness(bb, play_rect, select_lightness);}
// colourise theme for export feedback
if(themeon > 0)
{
static float h = 0;
setHueSat(bb, export_rect, h, 0.5f);
h += 0.002f;
if(h >= 1.0f)
{
h = 0.f;
themeon = 0;
}
}
// blit to screen
SDL_BlitSurface(bb, NULL, screen, NULL);
SDL_UpdateWindowSurface(window);
// cursor
if(ih == 1)
SDL_CursorPointer(1);
else
SDL_CursorPointer(0);
}
int main(int argc, char *args[])
{
// init sdl
if(SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO|SDL_INIT_EVENTS) < 0)
{
fprintf(stderr, "ERROR: SDL_Init(): %s\n", SDL_GetError());
return 1;
}
// create window
window = SDL_CreateWindow("Borg ER-0", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, screen_rect.w, screen_rect.h, SDL_WINDOW_SHOWN);
if(window == NULL)
{
fprintf(stderr, "ERROR: SDL_CreateWindow(): %s\n", SDL_GetError());
return 1;
}
// create screen
SDL_Surface* screen = SDL_GetWindowSurface(window);
if(screen == NULL)
{
fprintf(stderr, "ERROR: SDL_GetWindowSurface(): %s\n", SDL_GetError());
return 1;
}
// credit
printf("Borg ER-0 by James William Fletcher\n");
// get app dir
basedir = SDL_GetBasePath();
appdir = SDL_GetPrefPath("voxdsp", "borger0");
printf("basePath: %s\n", basedir);
printf("prefPath: %s\n", appdir);
#ifdef __linux__
printf("exportPath: %s/EXPORTS/Borg_ER-0\n\n", getenv("HOME"));
#endif
// sdl version
SDL_version compiled;
SDL_version linked;
SDL_VERSION(&compiled);
SDL_GetVersion(&linked);
printf("Compiled against SDL version %u.%u.%u.\n", compiled.major, compiled.minor, compiled.patch);
printf("Linked against SDL version %u.%u.%u.\n", linked.major, linked.minor, linked.patch);
// instructions
printf("Binds to play audio: spacebar, mouse3, mouse4\n");
printf("Reset envelope/oscillator: right click on it\n");
printf("Scroll dial sensitivity selection: right click, three sensitvity options\n\n");
// load assets
loadAssets(screen);
// load bank
loadState();
//init audio
initMonoAudio(SAMPLE_RATE);
// themeing (this is the general idea of how to re-theme, I don't intend to use this in production)
// but say someone made a modification, it might be a good idea to change the theme a little
// so that users know which version they are using.
// ----------------------------------------------
// replaceColour(s_bg, screen_rect, outlinecolor, 0, 200, 0);
// outlinecolor = getpixel(s_bg, 6, 14);
// replaceColour(s_bg, screen_rect, bgcolor, 32, 77, 133);
// bgcolor = getpixel(s_bg, 0, 0);
// replaceColour(s_bg, screen_rect, scopecolor, 77, 133, 0);
// scopecolor = getpixel(s_bg, 7, 155);
// set icon
SDL_SetWindowIcon(window, s_icon);
// first render
stopSample();
doSynth(0);
render(screen);
// event loop
while(1)
{
SDL_Event event;
Sint32 rx, ry;
while(SDL_WaitEvent(&event))
{
switch(event.type)
{
case SDL_WINDOWEVENT:
{
render(screen);
}
break;
case SDL_MOUSEMOTION:
{
const Sint32 x = event.motion.x, y = event.motion.y;
static struct sui lui;
// Adjust envelope
if(envelope_enabled == 1 && x >= envelope_rect.x && x <= envelope_rect.x+envelope_rect.w-3 && y > envelope_rect.y && y < envelope_rect.y+envelope_rect.h+1)
{
static Uint32 li2 = 0;
const Uint32 ni = x-envelope_rect.x;
const float nv = 1.f-((float)(y-envelope_rect.y) / (float)envelope_rect.h);
synth[selected_bank].envelope[ni] = nv;
// really simple but effective smoothing method
// otherwise the input code needs to be executed on
// a seperate thread where the render no longer blocks.
Uint32 di = ni-li2;
if(di < 6)
{
while(di > 0)
{
synth[selected_bank].envelope[li2+di] = nv;
di--;
}
}
// tick envalope renders at 20 fps
static Uint32 lt = 0;
if(SDL_GetTicks() > lt)
{
render(screen);
lt = SDL_GetTicks() + 50;
}
li2 = ni;
break;
}
// render dial rotations or button hovers
if(selected_dial >= 0)
{
// scale dial sensitivity
float sense = 0.001f / dial_scale[selected_dial];
if(select_mode == 0)
{
if(dial_scale[selected_dial] == MAXFREQUENCY)
sense = 0.3f / dial_scale[selected_dial];
else if(dial_scale[selected_dial] == MAXAMPLITUDE)
sense = 0.1f / dial_scale[selected_dial];
}
else if(select_mode == 1)
sense = 0.001f / dial_scale[selected_dial];
else if(select_mode == 2)
sense = 1.6f / dial_scale[selected_dial];
// do rotation
SDL_GetRelativeMouseState(&rx, &ry);
if(ry != 0){synth[selected_bank].dial_state[selected_dial] -= ((float)(ry))*sense;}
if(synth[selected_bank].dial_state[selected_dial] >= 1.f)
synth[selected_bank].dial_state[selected_dial] = 1.f;
else if(synth[selected_bank].dial_state[selected_dial] < -1.f)
synth[selected_bank].dial_state[selected_dial] = -1.f;
// tick dial turn renders at 20 fps
static Uint32 lt = 0;
if(SDL_GetTicks() > lt)
{
render(screen);
lt = SDL_GetTicks() + 50;
}
}
else
{
// Adjust oscillator
if(osc_enabled == 1 && x >= osc_rect.x && x <= osc_rect.x+osc_rect.w-3 && y >= osc_rect.y && y < osc_rect.y+osc_rect.h)
{
static Uint32 li1 = 0;
const Uint32 ni = x-osc_rect.x;
const float nv = 1.f-((float)(y-osc_rect.y+1) / (float)osc_rect.h);
synth[selected_bank].osctable[ni] = nv;
// really simple but effective smoothing method
// otherwise the input code needs to be executed on
// a seperate thread where the render no longer blocks.
Uint32 di = ni-li1;
if(di < 6)
{
while(di > 0)
{
synth[selected_bank].osctable[li1+di] = nv;
di--;
}
}
// tick oscillator renders at 20 fps
static Uint32 lt = 0;
if(SDL_GetTicks() > lt)
{
render(screen);
lt = SDL_GetTicks() + 50;
}
li1 = ni;
break;
}
// clear states
memset(&ui, 0x00, sizeof(struct sui));
// check for hover state and return
Uint8 sc = 0; // skip check
if(inrange(&ui.bankl_hover, &sc, x, y, bankl_rect) == 0)
if(inrange(&ui.bankr_hover, &sc, x, y, bankr_rect) == 0)
if(inrange(&ui.load_hover, &sc, x, y, load_rect) == 0)
if(inrange(&ui.save_hover, &sc, x, y, save_rect) == 0)
if(inrange(&ui.secl_hover, &sc, x, y, secl_rect) == 0)
if(inrange(&ui.secr_hover, &sc, x, y, secr_rect) == 0)
if(inrange(&ui.export_hover, &sc, x, y, export_rect) == 0)
if(inrange(&ui.play_hover, &sc, x, y, play_rect) == 0)
for(int i = 0; i < TOTAL_DIALS; i++)
if(inrange(&ui.dial_hover[i], &sc, x, y, dial_rect[i]) == 1)
break;
// render if there has been a change in state
if(memcmp(&lui, &ui, sizeof(struct sui)) != 0)
{
render(screen);
memcpy(&lui, &ui, sizeof(struct sui));
}
}
}
break;
case SDL_KEYDOWN:
{
if(event.key.keysym.sym == SDLK_SPACE)
{
doSynth(1);
render(screen);
}
}
break;
case SDL_MOUSEBUTTONUP:
{
static struct ssynth lsyn[256];
if(osc_enabled == 1)
{
SDL_CaptureMouse(SDL_FALSE);
osc_enabled = 0;
doSynth(0);
render(screen);
memcpy(&lsyn, &synth[selected_bank], sizeof(struct sui));
}
if(envelope_enabled == 1)
{
SDL_CaptureMouse(SDL_FALSE);
envelope_enabled = 0;
doSynth(0);
render(screen);
memcpy(&lsyn, &synth[selected_bank], sizeof(struct sui));
}
else if(selected_dial >= 0)
{
SDL_GetRelativeMouseState(&rx, &ry);
SDL_SetRelativeMouseMode(SDL_FALSE);
const Sint32 hh = dial_rect[selected_dial].h/2; // no point making this static
SDL_WarpMouseInWindow(window, dial_rect[selected_dial].x+hh, dial_rect[selected_dial].y+hh);
selected_dial = -1;
doSynth(0);
render(screen);
memcpy(&lsyn, &synth[selected_bank], sizeof(struct sui));
}
else
{
if(memcmp(&lsyn, &synth[selected_bank], sizeof(struct sui)) != 0)
{
doSynth(0);
render(screen);
memcpy(&lsyn, &synth[selected_bank], sizeof(struct sui));
}
}
}
break;
case SDL_MOUSEBUTTONDOWN:
{
const Uint32 x = event.button.x, y = event.button.y;
if(event.button.button == SDL_BUTTON_RIGHT)
{
// dial sensitivity
Uint8 sc = 0; // skip check
for(int i = 0; i < TOTAL_DIALS; i++)
{
if(inrange(&ui.dial_hover[i], &sc, x, y, dial_rect[i]) == 1)
{
select_mode++;
if(select_mode >= 3)
select_mode = 0;
break;
}
}
if(sc == 1)
{
render(screen);
break;
}
// reset envelope
if(x > envelope_rect.x && x < envelope_rect.x+envelope_rect.w && y > envelope_rect.y && y < envelope_rect.y+envelope_rect.h)
{
for(int i = 0; i < envelope_rect.w-2; i++)
synth[selected_bank].envelope[i] = 0.5f;
doSynth(0);
render(screen);
break;
}
// reset osc
if(x > osc_rect.x && x < osc_rect.x+osc_rect.w && y > osc_rect.y && y < osc_rect.y+osc_rect.h)
{
const float su = 6.283185482f / (float)(osc_rect.w-2);
for(int i = 0; i < osc_rect.w-2; i++)
synth[selected_bank].osctable[i] = (sinf(su*i)+1.0f)*0.5f;
doSynth(0);
render(screen);
break;
}
render(screen);
}
else if(event.button.button == SDL_BUTTON_X1 || event.button.button == SDL_BUTTON_MIDDLE)
{
doSynth(1);
render(screen);
}
else if(event.button.button == SDL_BUTTON_LEFT)
{
Uint8 sc = 0; // skip check
for(int i = 0; i < TOTAL_DIALS; i++)
{
if(ui.dial_hover[i] == 1)
{
SDL_GetRelativeMouseState(&rx, &ry);
SDL_SetRelativeMouseMode(SDL_TRUE);
selected_dial = i;
break;
}
}
if(sc == 0)
{
if(x > envelope_rect.x && x < envelope_rect.x+envelope_rect.w && y > envelope_rect.y && y < envelope_rect.y+envelope_rect.h)
{
sc=1;
envelope_enabled = 1;
SDL_CaptureMouse(SDL_TRUE);
}
else if(x > osc_rect.x && x < osc_rect.x+osc_rect.w && y > osc_rect.y && y < osc_rect.y+osc_rect.h)
{
sc=1;
osc_enabled = 1;
SDL_CaptureMouse(SDL_TRUE);
}
else if(ui.play_hover == 1)
{
sc=1;
doSynth(1);
}
else if(ui.export_hover == 1)
{
sc=1;
char file[256];
#ifdef __linux__
sprintf(file, "%s/EXPORTS", getenv("HOME"));
mkdir(file, 0755);
sprintf(file, "%s/Borg_ER-0", file);
mkdir(file, 0755);
sprintf(file, "%s/bank-%d.wav", file, selected_bank);
printf("File written to: %s\n", file);
#else
sprintf(file, "bank-%d.wav", selected_bank);
#endif
writeWAV(file);
// some user feedback
themeon=1;
while(themeon == 1)
render(screen);
}
else if(ui.load_hover == 1)
{
sc=1;
loadState();
doSynth(0);
}
else if(ui.save_hover == 1)
{
sc=1;
saveState();
}
else if(ui.bankl_hover == 1)
{
stopSample();
sc=1;
selected_bank--;
doSynth(0);
}
else if(ui.bankr_hover == 1)
{
stopSample();
sc=1;
selected_bank++;
doSynth(0);
}
else if(ui.secl_hover == 1)
{
sc=1;
synth[selected_bank].seclen--;
if(synth[selected_bank].seclen == 0)
synth[selected_bank].seclen = MAXSAMPLELEN;
doSynth(0);
stopSample();
}
else if(ui.secr_hover == 1)
{
sc=1;
synth[selected_bank].seclen++;
if(synth[selected_bank].seclen > MAXSAMPLELEN)
synth[selected_bank].seclen = 1;
doSynth(0);
stopSample();
}
}
render(screen);
}
}
break;
case SDL_QUIT:
{
saveState();
SDL_FreeSurface(bb);
SDL_FreeSurface(s_bg);
SDL_FreeSurface(s_icon);
SDL_CursorPointer(1337);
drawText(NULL, "*K", 0, 0, 0);
SDL_DestroyWindow(window);
SDL_CloseAudio();
SDL_Quit();
exit(0);
}
break;
}
}
}
//Done.
return 0;
}