one-way wall collision

src/config.h

@@ -1,11 +1,5 @@
 // Project-wide configurable constants
 
-// Rendered texture size + extra room for off-screen light falloff
-#define RENDER_WIDTH    (640 + 250)
-#define RENDER_HEIGHT   (360 + 250)
-
-#define PIXELS_PER_UNIT ((f64)640 / (f64)DEFAULT_CAMERA_WIDTH)
-
 // How many ticks back in time should the user thread blend between?
 // <Delay> = <USER_INTERP_RATIO> * <Tick interval>
 // E.g: At 1.5, the user thread will render 75ms back in time if the sim runs at 50tps
@@ -13,34 +7,15 @@
 #define USER_INTERP_ENABLED 1
 
 #define SIM_MAX_PING 5.0
+
+#define SIM_PHYSICS_SUBSTEPS 8
+
 #define SIM_TICKS_PER_SECOND 64
 #define SIM_TICK_INTERVAL_NS (NsFromSeconds(1) / SIM_TICKS_PER_SECOND)
 // Like USER_INTERP_RATIO, but applies to snapshots received by the local sim from the
 // master sim (how far back in time should the client render the server's state)
 #define SIM_CLIENT_INTERP_RATIO 2.0
 
-#define SIM_PHYSICS_SUBSTEPS 4
-#define SIM_PHYSICS_ENABLE_WARM_STARTING 1
-#define SIM_PHYSICS_ENABLE_RELAXATION 1
-#define SIM_PHYSICS_ENABLE_TOI 1
-
-#define SIM_PHYSICS_ENABLE_COLLISION 1
-#define SIM_SPAWN_TESTENT 0
-#define SIM_PLAYER_AIM 1
-
-#if 0
-  #define SIM_MAX_LINEAR_VELOCITY 500
-  #define SIM_MAX_ANGULAR_VELOCITY (Tau * 20)
-#else
-  #define SIM_MAX_LINEAR_VELOCITY F32Infinity
-  #define SIM_MAX_ANGULAR_VELOCITY F32Infinity
-#endif
-
-#define COLLIDER_DEBUG 0
-#define COLLIDER_DEBUG_DETAILED 1
-#define COLLIDER_DEBUG_DETAILED_DRAW_MENKOWSKI 1
-
-#define FLOOD_DEBUG 0
 
 #define GPU_DEBUG 0
 #define GPU_DEBUG_VALIDATION 0

src/pp/pp.c

@@ -194,7 +194,7 @@ P_Shape P_LocalShapeFromEnt(P_Ent *ent)
     result = P_ShapeFromDesc(
       .mass = 10,
       .count = 1,
-      .radius = 0.3,
+      .radius = 0.25,
     );
 
     // f32 guy_width = 0.75;
@@ -202,7 +202,7 @@ P_Shape P_LocalShapeFromEnt(P_Ent *ent)
     // result = P_ShapeFromDesc(
     //   .mass = 10,
     //   .count = 2,
-    //   .points = { VEC2(-guy_width / 2 + (guy_height / 2), 0), VEC2(guy_width / 2 - (guy_height / 2), 0) },
+    //   .points = { VEC2(0, -guy_width / 2 + (guy_height / 2)), VEC2(0, guy_width / 2 - (guy_height / 2)) },
     //   .radius = guy_height / 2,
     // );
 
@@ -1369,7 +1369,6 @@ P_Space P_SpaceFromFrame(Arena *arena, P_Frame *frame)
     {
       Vec2 p0 = VEC2(wall->start.x / P_TilesPerMeter - P_WorldPitch / 2, wall->start.y / P_TilesPerMeter - P_WorldPitch / 2);
       Vec2 p1 = VEC2(wall->end.x / P_TilesPerMeter - P_WorldPitch / 2, wall->end.y / P_TilesPerMeter - P_WorldPitch / 2);
-      // P_Shape shape = P_ShapeFromDesc(.count = 2, .points = { p0, p1 });
       P_Shape shape = P_ShapeFromDesc(.count = 2, .points = { p0, p1 }, .radius = 0.01  );
       Rng2 aabb = P_BoundingBoxFromShape(shape);
       aabb = AddRng2Vec2(aabb, VEC2(P_WorldPitch / 2.0, P_WorldPitch / 2.0));
@@ -1392,31 +1391,11 @@ P_Space P_SpaceFromFrame(Arena *arena, P_Frame *frame)
           SllStackPush(cell->first, entry);
           entry->shape = shape;
           entry->shape_id = id;
+          entry->dir.x = (wall->dir == WallDir_Right) + ((wall->dir == WallDir_Left) * -1);
+          entry->dir.y = (wall->dir == WallDir_Down) + ((wall->dir == WallDir_Up) * -1);
         }
       }
-
-      // P_DebugDrawShape(shape, Color_Cyan);
     }
-
-    //- Debug draw walls
-    // {
-    //   i64 wall_idx = 0;
-    //   for (GenWall *wall = first_wall; wall; wall = wall->next)
-    //   {
-    //     Vec2 p0 = VEC2(wall->start.x / P_TilesPerMeter - P_WorldPitch / 2, wall->start.y / P_TilesPerMeter - P_WorldPitch / 2);
-    //     Vec2 p1 = VEC2(wall->end.x / P_TilesPerMeter - P_WorldPitch / 2, wall->end.y / P_TilesPerMeter - P_WorldPitch / 2);
-    //     u64 color_seed0 = MixU64(wall_idx + 1);
-    //     u64 color_seed1 = MixU64(color_seed0);
-    //     u64 color_seed2 = MixU64(color_seed1);
-    //     Vec4 color = Color_White;
-    //     color.r = Norm24(color_seed0) * 0.75 + 0.25;
-    //     color.g = Norm24(color_seed1) * 0.75 + 0.25;
-    //     color.b = Norm24(color_seed2) * 0.75 + 0.25;
-    //     P_DebugDrawLine(p0, p1, color);
-    //     ++wall_idx;
-    //   }
-    //   ++wall_idx;
-    // }
   }
 
 
@@ -2051,11 +2030,11 @@ void P_StepFrame(P_Frame *frame)
   //////////////////////////////
   //- Setup constraints store
 
-  i32 solver_steps_count = 4;
+  i32 solver_steps_count = SIM_PHYSICS_SUBSTEPS;
   f32 solver_dt = sim_dt / solver_steps_count;
 
   // Solid params
-  SoftSpring solid_spring = MakeSpring(TweakFloat("Contact spring hz", 25, 5, 100), TweakFloat("Contact spring damp", 10, 5, 100), solver_dt);
+  SoftSpring solid_spring = MakeSpring(TweakFloat("Contact spring hz", 100, 5, 200), TweakFloat("Contact spring damp", 10, 5, 100), solver_dt);
   f32 solid_pushout_velocity = TweakFloat("Contact spring pushout", 3, 0, 50);
 
   // Gentle params
@@ -2128,7 +2107,17 @@ void P_StepFrame(P_Frame *frame)
                 if (constraint->last_touched_tick < frame->tick)
                 {
                   P_CollisionResult collision = P_CollisionResultFromShapes(shape0, shape1);
-                  if (collision.collision_points_count > 0)
+
+                  b32 skip_collision = 0;
+                  skip_collision = skip_collision || collision.collision_points_count <= 0;
+                  if (!skip_collision && !IsVec2Zero(space_entry->dir))
+                  {
+                    // Skip collision if normal violates one-way direction
+                    f32 threshold = 0.5;
+                    skip_collision = DotVec2(space_entry->dir, collision.collision_normal) >= threshold;
+                  }
+
+                  if (!skip_collision)
                   {
                     if (P_IsConstraintNil(constraint))
                     {

src/pp/pp.h

@@ -257,6 +257,7 @@ Struct(P_SpaceEntry)
   P_SpaceEntry *next;
   P_Shape shape;
   u64 shape_id;
+  Vec2 dir;
 };
 
 Struct(P_SpaceCell)