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feat: add microui-based GUI with transport controls and progress bar

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Co-authored-by: aider (deepseek/deepseek-coder) <aider@aider.chat>
This commit is contained in:
Loic Coenen
2026-05-01 13:02:39 +00:00
parent 3b95c22736
commit 05c6f34b8f
7 changed files with 473 additions and 3 deletions
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221
gui.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <jack/jack.h>
#include <ncurses.h>
#include "engine.h"
#include "gui.h"
/* microui includes */
#define MU_IMPLEMENTATION
#include "microui.h"
/* ---------------------------------------------------------------------------
* microui callbacks
* ------------------------------------------------------------------------- */
static int text_width(mu_Font font, const char *text, int len)
{
(void)font;
if (len == -1) { len = strlen(text); }
return len * 8;
}
static int text_height(mu_Font font)
{
(void)font;
return 18;
}
/* ---------------------------------------------------------------------------
* global state
* ------------------------------------------------------------------------- */
static mu_Context *ctx = NULL;
static int running = 1;
/* engine state */
static jack_client_t *client = NULL;
static int active = 0;
static float bpm = 120.0f;
static int loop_length = 8; /* beats */
static int current_beat = 0;
static float *buffer = NULL;
static int buffer_size = 0;
/* ---------------------------------------------------------------------------
* drawing helpers (stubs for microui)
* ------------------------------------------------------------------------- */
static void draw_frame(mu_Context *ctx, mu_Rect rect, int colorid)
{
/* stub: we rely on ncurses for actual rendering */
(void)ctx;
(void)rect;
(void)colorid;
}
/* ---------------------------------------------------------------------------
* GUI update
* ------------------------------------------------------------------------- */
static void gui_update(void)
{
mu_begin(ctx);
/* main window */
if (mu_begin_window(ctx, "Jack Looper", mu_rect(10, 10, 400, 300))) {
/* transport controls */
mu_layout_row(ctx, 3, (int[]) { 80, 80, 80 }, 0);
if (mu_button(ctx, active ? "Stop" : "Play")) {
active = !active;
if (active) {
engine_start(client);
} else {
engine_stop(client);
}
}
if (mu_button(ctx, "Reset")) {
current_beat = 0;
}
if (mu_button(ctx, "Quit")) {
running = 0;
}
/* BPM slider */
mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
mu_label(ctx, "BPM:");
if (mu_slider(ctx, &bpm, 20.0f, 300.0f, 0, "%.0f", 0)) {
engine_set_bpm(client, bpm);
}
/* loop length */
mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
mu_label(ctx, "Length:");
if (mu_slider(ctx, (float*)&loop_length, 1.0f, 64.0f, 0, "%.0f", 0)) {
engine_set_loop_length(client, loop_length);
}
/* beat indicator */
mu_layout_row(ctx, 1, (int[]) { -1 }, 0);
{
char buf[64];
snprintf(buf, sizeof(buf), "Beat: %d / %d", current_beat + 1, loop_length);
mu_label(ctx, buf);
}
/* progress bar */
mu_layout_row(ctx, 1, (int[]) { -1 }, 0);
{
float progress = (loop_length > 0) ? (float)current_beat / (float)loop_length : 0.0f;
mu_Rect r = mu_layout_next(ctx);
mu_draw_control_frame(ctx, mu_get_id(ctx, &progress, sizeof(progress)), r, MU_COLOR_BASE, 0);
if (progress > 0.0f) {
mu_Rect fill = r;
fill.w = (int)(r.w * progress);
mu_draw_rect(ctx, fill, mu_color(100, 200, 100, 255));
}
}
mu_end_window(ctx);
}
mu_end(ctx);
}
/* ---------------------------------------------------------------------------
* main loop
* ------------------------------------------------------------------------- */
int gui_main(jack_client_t *jack_client, float *audio_buffer, int buf_size)
{
client = jack_client;
buffer = audio_buffer;
buffer_size = buf_size;
/* initialise microui */
ctx = malloc(sizeof(mu_Context));
if (!ctx) return -1;
mu_init(ctx);
ctx->text_width = text_width;
ctx->text_height = text_height;
ctx->draw_frame = draw_frame;
/* ncurses setup */
initscr();
cbreak();
noecho();
keypad(stdscr, TRUE);
nodelay(stdscr, TRUE);
curs_set(0);
/* main loop */
while (running) {
/* handle input */
int ch = getch();
if (ch != ERR) {
switch (ch) {
case 'q':
case 'Q':
running = 0;
break;
case ' ':
active = !active;
if (active) {
engine_start(client);
} else {
engine_stop(client);
}
break;
case KEY_UP:
bpm = fminf(bpm + 5.0f, 300.0f);
engine_set_bpm(client, bpm);
break;
case KEY_DOWN:
bpm = fmaxf(bpm - 5.0f, 20.0f);
engine_set_bpm(client, bpm);
break;
case KEY_LEFT:
loop_length = (loop_length > 1) ? loop_length - 1 : 1;
engine_set_loop_length(client, loop_length);
break;
case KEY_RIGHT:
loop_length = (loop_length < 64) ? loop_length + 1 : 64;
engine_set_loop_length(client, loop_length);
break;
default:
break;
}
}
/* update engine state */
current_beat = engine_get_current_beat(client);
/* render GUI */
gui_update();
/* draw commands */
mu_Command *cmd = NULL;
while (mu_next_command(ctx, &cmd)) {
if (cmd->type == MU_COMMAND_TEXT) {
mvprintw(cmd->text.pos.y / 18, cmd->text.pos.x / 8, "%.*s",
cmd->text.len, cmd->text.text);
}
if (cmd->type == MU_COMMAND_RECT) {
/* simple rectangle rendering using ncurses */
int x = cmd->rect.rect.x / 8;
int y = cmd->rect.rect.y / 18;
int w = cmd->rect.rect.w / 8;
int h = cmd->rect.rect.h / 18;
for (int i = 0; i < h && y + i < LINES; i++) {
mvhline(y + i, x, ' ', w);
}
}
}
refresh();
usleep(16666); /* ~60 fps */
}
/* cleanup */
endwin();
free(ctx);
return 0;
}