added delta time

- updated readme requirements
- changed audio capture name

README.md

@@ -6,13 +6,18 @@ This is a small C SDL2 project making physics objects react to audio
 
 ## Requirements
 
+- pipewire
+- qpwgraph (optional. Makes it easier to force the audio capture input)
+- clang
+- pkg-config
+
+### libraries
+
 - SDL2
 - SDL2_gfx
 - libpipewire
 - libspa-2.0
-- clang
 - libgcc
-- pkg-config
 
 ## building
 
@@ -21,10 +26,10 @@ there is no install
 
 ## usage
 
-You can specify the reading device. I have no clue how it works.
+You can specify the reading device in the args. I have no clue how it works.
 
 Just run audio_reactive binary.
-Then use something like qpwgraph to to force change the input of ``audio-capture``
+Then use something like qpwgraph to to force change the input of ``audio_reactive``
 
 ## Todo
 

src/main.c

@@ -15,7 +15,6 @@ bool running=true;
 
 #define PROJECT_NAME "audio reactive"
 
-
 int main(int argc, char *argv[])
 {
     if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0)
@@ -35,10 +34,10 @@ int main(int argc, char *argv[])
 
     VOL_ARG volargs={ argc, argv, };
     pthread_t vol_thread;
-    int thread_err=pthread_create(&vol_thread, NULL, volume_input, (void *)&volargs);
+    pthread_create(&vol_thread, NULL, volume_input, (void *)&volargs);
 
     pthread_t peak_reduc;
-    int thread_err2=pthread_create(&peak_reduc, NULL, avg_peak, NULL);
+    pthread_create(&peak_reduc, NULL, avg_peak, NULL);
 
     srand(time(NULL));
     OBJECT_INER obj_storage[obj_n];
@@ -65,6 +64,7 @@ int main(int argc, char *argv[])
     SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
 
 	bool quit = false;
+    Uint32 lastUpdate = 0;
 	SDL_Event e;
 	while (!quit) {
 		while (SDL_PollEvent(&e)) {
@@ -88,9 +88,18 @@ int main(int argc, char *argv[])
             stuff.avg_peak=mutVolume.avg_peak;
             mutVolume.locked=false;
         }
+
+        Uint64 start = SDL_GetPerformanceCounter();
         //SDL_Log("vol: %f    avg: %f",stuff.volume,stuff.avg_peak);
+        Uint32 current=SDL_GetTicks();
+        stuff.dt = (current - lastUpdate);
 		draw(&stuff);
-		SDL_Delay(5);
+        lastUpdate=current;
+
+        Uint64 end = SDL_GetPerformanceCounter();
+        float elapsedMS = (end - start) / (float)SDL_GetPerformanceFrequency() * 1000.0f;
+        SDL_Delay(floor(16.666f - elapsedMS));
+        //SDL_Delay(rand() % 25);
 	}
 
     running=false;

src/objects.c

@@ -31,15 +31,20 @@ void init_stuffs(int w, int h, OBJECT_INER *objs,STUFFS *stuff){
     attractor_constructor(w,h,&stuff->obj.attractor,(float)w/2,(float)h/2,100);
 }
 
-void applyForce(OBJECT_INER *obj, Point force){
+void applyForce(STUFFS *stuff, OBJECT_INER *obj, Point force){
     point_div(&force, &(Point){obj->mass,obj->mass});
-    point_add(&obj->acc, &force);
+    Point add_vec=force;
+    point_add(&obj->acc, &add_vec);
 }
 
 void update(STUFFS *stuff, OBJECT_INER *obj){
-    point_add(&obj->vel,&obj->acc);
+    Point add_vec=obj->acc;
+    point_add(&obj->vel,&add_vec);
     point_limit(&obj->vel,10);
-    point_add(&obj->pos, &obj->vel);
+
+    add_vec=obj->vel;
+    point_mul(&add_vec,&(Point){(float)stuff->dt/10,(float)stuff->dt/10});
+    point_add(&obj->pos, &add_vec);
     obj->acc = (Point){0,0};
 }
 
@@ -74,7 +79,7 @@ float calcG(ATTRACTOR *attractor, OBJECT_INER *obj,STUFFS *stuff){
         G=5;
     }
 
-    if(G!=G) G=1;
+    if(G!=G) G=5;
     return G;
 }
 
@@ -85,10 +90,10 @@ void attract(ATTRACTOR *attractor, OBJECT_INER *obj,STUFFS *stuff){
     dist = constrain(dist,100,1000);
 
     float G = calcG(attractor,obj,stuff);
-    float strength = G * (attractor->mass * obj->mass) / dist;
+    float strength = ((float)stuff->dt/10) * G * (attractor->mass * obj->mass) / dist;
 
     point_set_mag(&force, strength);
-    applyForce(obj,force);
+    applyForce(stuff,obj,force);
 }
 
 void atr_show(STUFFS *stuff,ATTRACTOR *attr){
@@ -96,8 +101,8 @@ void atr_show(STUFFS *stuff,ATTRACTOR *attr){
 }
 
 void draw(STUFFS *stuff){
-    SDL_SetRenderDrawColor(stuff->renderer,0,0,0,30);
+    SDL_SetRenderDrawColor(stuff->renderer,0,0,0,50);
-    //SDL_RenderClear(renderer);
+    //SDL_RenderClear(stuff->renderer);
     SDL_RenderFillRect(stuff->renderer, &(SDL_Rect){0,0,stuff->width,stuff->height});
     static int frame_i1=0;
 
@@ -107,16 +112,17 @@ void draw(STUFFS *stuff){
 
         attract(&stuff->obj.attractor, stuff->obj.objs[i], stuff);
         float vol=stuff->volume;
-        if(vol==vol && frame_i1>200){
+        if(vol==vol && frame_i1>100){
             Point rand_p={RandomFloat(-1, 1),RandomFloat(-1, 1)};
             point_set_mag(&rand_p, stuff->volume*100);
+            point_mul(&rand_p,&(Point){(float)stuff->dt/10,(float)stuff->dt/10});
             point_add(&stuff->obj.objs[i]->vel,&rand_p);
         }
     }
     SDL_SetRenderDrawColor(stuff->renderer, 100,20,20,180);
     atr_show(stuff,&stuff->obj.attractor);
 
-    if(frame_i1>200) frame_i1=0;
+    if(frame_i1>100) frame_i1=0;
     frame_i1++;
 	SDL_RenderPresent(stuff->renderer);
 }

src/objects.h

@@ -47,6 +47,7 @@ typedef struct{
     OBJECT obj;
     flaot volume;
     flaot avg_peak;
+    Uint32 dt;
 } STUFFS;
 
 #endif

src/pipe.c

@@ -180,7 +180,7 @@ void *volume_input(void* threadarg){
 
     data.stream = pw_stream_new_simple(
             pw_main_loop_get_loop(data.loop),
-            "audio-capture",
+            "audio_reactive",
             props,
             &stream_events,
             &data);