Ensure physics aren't tied to framerate

code/game/src/platform_raylib.c

@@ -28,7 +28,7 @@ void platform_init() {
     InitWindow(screenWidth, screenHeight, "eco2d");
     SetWindowState(FLAG_WINDOW_UNDECORATED|FLAG_WINDOW_MAXIMIZED|FLAG_WINDOW_RESIZABLE|FLAG_MSAA_4X_HINT);
     
-    SetTargetFPS(60);
+    //SetTargetFPS(144);
     screenWidth = GetScreenWidth();
     screenHeight = GetScreenHeight();
     renderer_init();

code/game/src/vehicle.c

@@ -9,11 +9,12 @@ uint64_t vehicle_spawn(void) {
     ecs_entity_t e = entity_spawn(EKIND_VEHICLE);
     
     Vehicle *veh = ecs_get_mut(world_ecs(), e, Vehicle, NULL);
-    zpl_zero_item(veh);
-    veh->wheel_base = 50.0f;
-    veh->speed = 50.0f;
-    veh->reverse_speed = -20.0f;
-    veh->force = 0.0f;
+    *veh = (Vehicle){
+        .wheel_base = 50.0f,
+        .speed = 50.0f,
+        .reverse_speed = -20.0f,
+        .force = 0.0f,
+    };
     return (uint64_t)e;
 }
 

code/modules/modules/systems.c

@@ -8,7 +8,7 @@
 #include "game.h"
 
 #define PHY_BLOCK_COLLISION 1
-#define PHY_WALK_DRAG 0.12
+#define PHY_WALK_DRAG 4.23f
 #define PHY_LOOKAHEAD(x) (zpl_sign(x)*16.0f)
 
 #include "source/system_onfoot.c"
@@ -29,7 +29,7 @@ void IntegratePositions(ecs_iter_t *it) {
         for (int i = 0; i < it->count; i++) {
             // NOTE(zaklaus): world bounds
             {
-                double w = (double)world_dim();
+                float w = (float)world_dim();
                 p[i].x = zpl_clamp(p[i].x, 0, w-1);
                 p[i].y = zpl_clamp(p[i].y, 0, w-1);
             }
@@ -127,8 +127,8 @@ void ApplyWorldDragOnVelocity(ecs_iter_t *it) {
         world_block_lookup lookup = world_block_from_realpos(p[i].x, p[i].y);
         float drag = zpl_clamp(blocks_get_drag(lookup.block_id), 0.0f, 1.0f);
         float friction = blocks_get_friction(lookup.block_id);
-        v[i].x = zpl_lerp(v[i].x, 0.0f, PHY_WALK_DRAG*drag*friction);
-        v[i].y = zpl_lerp(v[i].y, 0.0f, PHY_WALK_DRAG*drag*friction);
+        v[i].x = zpl_lerp(v[i].x, 0.0f, PHY_WALK_DRAG*drag*friction*it->delta_time);
+        v[i].y = zpl_lerp(v[i].y, 0.0f, PHY_WALK_DRAG*drag*friction*it->delta_time);
     }
 }
 

code/modules/modules/systems.h

@@ -3,6 +3,7 @@
 
 typedef struct {
     // NOTE(zaklaus): Public systems are exposed here
+    int32_t _unused;
 } Systems;
 
 #define SystemsImportHandles(handles) (void)(handles)

code/modules/source/system_demo.c

@@ -1,12 +1,12 @@
 
-#define DEMO_NPC_MOVE_SPEED 50
-#define DEMO_NPC_STEER_SPEED 30
+#define DEMO_NPC_MOVE_SPEED 500
+#define DEMO_NPC_STEER_SPEED 300
 
 void DemoNPCMoveAround(ecs_iter_t *it) {
     Velocity *v = ecs_column(it, Velocity, 1);
     for (int i = 0; i < it->count; i++) {
         float d = zpl_quake_rsqrt(v[i].x*v[i].x + v[i].y*v[i].y);
-        v[i].x += (v[i].x*d*DEMO_NPC_MOVE_SPEED + zpl_cos(zpl_to_radians(rand()%360))*DEMO_NPC_STEER_SPEED);
-        v[i].y += (v[i].y*d*DEMO_NPC_MOVE_SPEED + zpl_sin(zpl_to_radians(rand()%360))*DEMO_NPC_STEER_SPEED);
+        v[i].x += (v[i].x*d*DEMO_NPC_MOVE_SPEED*it->delta_time + zpl_cos(zpl_to_radians(rand()%360))*DEMO_NPC_STEER_SPEED*it->delta_time);
+        v[i].y += (v[i].y*d*DEMO_NPC_MOVE_SPEED*it->delta_time + zpl_sin(zpl_to_radians(rand()%360))*DEMO_NPC_STEER_SPEED*it->delta_time);
     }
 }

code/modules/source/system_onfoot.c

@@ -1,4 +1,4 @@
-#define PLR_MOVE_SPEED 30.0
+#define PLR_MOVE_SPEED 800.0
 #define PLR_MOVE_SPEED_MULT 1.5
 
 void MovementImpulse(ecs_iter_t *it) {
@@ -10,7 +10,7 @@ void MovementImpulse(ecs_iter_t *it) {
         world_block_lookup lookup = world_block_from_realpos(p[i].x, p[i].y);
         float drag = zpl_clamp(blocks_get_drag(lookup.block_id), 0.0f, 1.0f);
         double speed = PLR_MOVE_SPEED * (in[i].sprint ? PLR_MOVE_SPEED_MULT : 1.0);
-        v[i].x += in[i].x*speed*drag;
-        v[i].y -= in[i].y*speed*drag;
+        v[i].x += in[i].x*speed*drag*it->delta_time;
+        v[i].y -= in[i].y*speed*drag*it->delta_time;
     }
 }

code/modules/source/system_vehicle.c

@@ -77,10 +77,11 @@ void EnterVehicle(ecs_iter_t *it) {
     }
 }
 
-#define VEHICLE_FORCE 34.8f
-#define VEHICLE_ACCEL 0.42f
+#define VEHICLE_FORCE 340.8f
+#define VEHICLE_ACCEL 0.12f
 #define VEHICLE_DECEL 0.28f
 #define VEHICLE_STEER 3.89f
+#define VEHICLE_POWER 34.89f
 #define VEHICLE_BRAKE_FORCE 0.84f
 
 void VehicleHandling(ecs_iter_t *it) {
@@ -134,8 +135,8 @@ void VehicleHandling(ecs_iter_t *it) {
         fr_x += car->force * drag * zpl_cos(car->heading + zpl_to_radians(car->steer));
         fr_y += car->force * drag * zpl_sin(car->heading + zpl_to_radians(car->steer));
         
-        v[i].x += (fr_x + bk_x) / 2.0f - p[i].x;
-        v[i].y += (fr_y + bk_y) / 2.0f - p[i].y;
+        v[i].x += ((fr_x + bk_x) / 2.0f - p[i].x)*it->delta_time*VEHICLE_POWER;
+        v[i].y += ((fr_y + bk_y) / 2.0f - p[i].y)*it->delta_time*VEHICLE_POWER;
         car->heading = zpl_arctan2(fr_y - bk_y, fr_x - bk_x);
         
         world_block_lookup lookahead = world_block_from_realpos(p[i].x+PHY_LOOKAHEAD(v[i].x), p[i].y+PHY_LOOKAHEAD(v[i].y));