libphysics: update de um tick

3 files changed, 30 insertions, 5 deletions

diff --git a/include/physics.h b/include/physics.h
index 5c4f377..8ffa438 100644
--- a/include/physics.h
+++ b/include/physics.h
@@ -1,3 +1,5 @@
+#define PHX_TICK_TIME (1.0 / 480.0)
+
 typedef int BodyID;
 
 typedef enum {
@@ -25,3 +27,5 @@ void phxgetsize(BodyID, float size[2]);
 
 int phxnextcollevent(CollisionEvent *ev);
 void phxtick(float delta);
+
+void phxfixtick(void);
diff --git a/libphysics/test/vis.c b/libphysics/test/vis.c
index ad3cef8..30688df 100644
--- a/libphysics/test/vis.c
+++ b/libphysics/test/vis.c
@@ -7,7 +7,7 @@
 
 #include "../dat.h"
 
-#define SBODY 256
+#define SBODY 2048
 
 static void process_events(void);
 static void render(void);
@@ -50,7 +50,7 @@ main()
 
 		phxsetpos(b, rand() % 800, rand() % 600);
 		phxsetsize(b, 5.0, 5.0);
-		phxapplyaccel(b, (float[]){ 30000 * FLOAT_RAND, 30000 * FLOAT_RAND });
+		phxapplyaccel(b, (float[]){ (150 / PHX_TICK_TIME) * FLOAT_RAND, (150 / PHX_TICK_TIME) * FLOAT_RAND });
 	}
 
 	phxsetmap(8, 8, (int[]) {
@@ -74,9 +74,16 @@ main()
 		new_ticks = SDL_GetTicksNS();
 		delta = (new_ticks - old_ticks) / 1000000000.0;
 		old_ticks = new_ticks;
-		phxtick(delta);
-		while(phxnextcollevent(&event)) {
-			printf("Collision with %d and %d\n", event.body1, event.body2);
+
+		static float accum = 0;
+
+		accum += delta;
+		while(accum >= PHX_TICK_TIME) {
+			phxfixtick();
+			while(phxnextcollevent(&event)) {
+				printf("Collision with %d and %d\n", event.body1, event.body2);
+			}
+			accum -= PHX_TICK_TIME;
 		}
 
 		render();
diff --git a/libphysics/tick.c b/libphysics/tick.c
index f31930a..23f7fa0 100644
--- a/libphysics/tick.c
+++ b/libphysics/tick.c
@@ -39,6 +39,20 @@ phxtick(float delta)
 }
 
 void
+phxfixtick(void)
+{
+	tick();
+	for(int i = 0; i < phxbodypoolsize; i++) {
+		Body *b = phxbodypool + i;
+		if(!b->active)
+			continue;
+
+		b->accel[0] = 0.0;
+		b->accel[1] = 0.0;
+	}
+}
+
+void
 tick(void)
 {
 	static int count = 0;