trying to read commands from std while displaying things, fixes

glonkers.c

@@ -1,10 +1,12 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <signal.h>
 #include <time.h> 
 #include <stdint.h>
 #include <wayland-client.h>
 #include <wayland-util.h>
 #include <SDL3/SDL.h>
+#include <pthread.h>
 #include "renderer.h"
 
 //int main() {
@@ -79,7 +81,34 @@ double time_since_start() {
            (now.tv_nsec - program_start.tv_nsec) / 1e9;
 }
 
+_Atomic bool running = true;
+
+void intHandler(int dummy) {
+    printf("exiting\n");
+    running = false;
+    fclose(stdin);
+}
+
+bool reload_shader = false;
+
+/// reads stdin on a separate thread.
+void *read_stdin(void *ptr) {
+    char buff[10];
+    while (running) {
+        fgets(buff, 10, stdin);
+        if (strcmp(buff, "r\n") == 0) {
+            printf("reloading shader\n");
+            reload_shader = true;
+        }
+    }
+    return NULL;
+}
+
 int main(int argc, char *argv[]) {
+    signal(SIGINT, intHandler);
+    pthread_t stdin_thread;
+    pthread_create( &stdin_thread, NULL, read_stdin, NULL);
+
     init_timer();
 
     printf("Good Morning 🍵\n");
@@ -109,7 +138,6 @@ int main(int argc, char *argv[]) {
     Renderer renderer = new_renderer();
 
     SDL_Event e;
-    int running = 1;
     int w, h;
     while (running) {
         while (SDL_PollEvent(&e)) {
@@ -128,9 +156,12 @@ int main(int argc, char *argv[]) {
         }
 
         double time = time_since_start();
-        render(&renderer, w, h, time, shader_path);
+        render(&renderer, w, h, time, shader_path, reload_shader);
+        if (reload_shader) reload_shader = false;
 
         SDL_GL_SwapWindow(window);
     }
+
+    pthread_join(stdin_thread, NULL);
 }