Y+ is up on coord system, send build rel to grid

gamestate.c

@@ -189,6 +189,10 @@ V2 grid_world_to_local(struct Grid *grid, V2 world)
 {
     return cp_to_v2(cpBodyWorldToLocal(grid->body, v2_to_cp(world)));
 }
+V2 grid_local_to_world(struct Grid *grid, V2 local)
+{
+    return cp_to_v2(cpBodyLocalToWorld(grid->body, v2_to_cp(local)));
+}
 // returned snapped position is in world coordinates
 V2 grid_snapped_box_pos(struct Grid *grid, V2 world)
 {
@@ -511,63 +515,13 @@ void process(struct GameState *gs, float dt)
         if (!p->connected)
             continue;
 
+        // update gold win condition
         if (V2length(V2sub(p->pos, gs->goldpos)) < GOLD_COLLECT_RADIUS)
         {
             p->goldness += 0.2;
             gs->goldpos = (V2){.x = hash11(gs->time) * 20.0f, .y = hash11(gs->time - 13.6f) * 20.0f};
         }
 
-        if (p->dobuild)
-        {
-            p->dobuild = false; // handle the input. if didn't do this, after destruction of hovered box, would try to build on its grid with grid_index...
-
-            cpPointQueryInfo info = {0};
-            // @Robust make sure to query only against boxes...
-            cpShape *nearest = cpSpacePointQueryNearest(gs->space, v2_to_cp(p->build), 0.01f, cpShapeFilterNew(CP_NO_GROUP, CP_ALL_CATEGORIES, CP_ALL_CATEGORIES), &info);
-            if (nearest != NULL)
-            {
-                struct Box *cur_box = (struct Box *)cpShapeGetUserData(nearest);
-                struct Grid *cur_grid = (struct Grid *)cpBodyGetUserData(cpShapeGetBody(nearest));
-                grid_remove_box(gs->space, cur_grid, cur_box);
-                p->spice_taken_away -= 0.1f;
-            }
-            else if(p->grid_index == -1)
-            {
-                // @Robust better memory mgmt
-                struct Grid *empty_grid = NULL;
-                for (int ii = 0; ii < MAX_GRIDS; ii++)
-                {
-                    if (gs->grids[ii].body == NULL)
-                    {
-                        empty_grid = &gs->grids[ii];
-                        break;
-                    }
-                }
-                p->spice_taken_away += 0.2f;
-                grid_new(empty_grid, gs, p->build);
-                cpBodySetVelocity(empty_grid->body, v2_to_cp(p->vel));
-                box_new(&empty_grid->boxes[0], gs, empty_grid, (V2){0});
-            }
-            else
-            {
-                struct Grid *g = &gs->grids[p->grid_index];
-
-                struct Box *empty_box = NULL;
-                for (int ii = 0; ii < MAX_BOXES_PER_GRID; ii++)
-                {
-                    if (g->boxes[ii].shape == NULL)
-                    {
-                        empty_box = &g->boxes[ii];
-                        break;
-                    }
-                }
-                // @Robust cleanly fail when not enough boxes
-                assert(empty_box != NULL);
-                p->spice_taken_away += 0.1f;
-                box_new(empty_box, gs, g, grid_world_to_local(g, p->build));
-            }
-        }
-
         if (gs->grids[p->currently_inhabiting_index].body == NULL)
         {
             p->currently_inhabiting_index = -1;
@@ -612,21 +566,82 @@ void process(struct GameState *gs, float dt)
             }
         }
 
+        // process movement
+        {
             if (p->currently_inhabiting_index == -1)
             {
                 // @Robust make sure movement vector is normalized so player can't cheat
                 p->vel = V2add(p->vel, V2scale(p->movement, dt * 0.5f));
-            p->pos = V2add(p->pos, V2scale(p->vel, dt));
                 p->spice_taken_away += dt * 0.15f * V2length(p->movement);
             }
             else
             {
                 struct Grid *g = &gs->grids[p->currently_inhabiting_index];
-            p->pos = V2lerp(p->pos, grid_com(g), dt * 20.0f);
+                V2 target_new_pos = V2lerp(p->pos, grid_com(g), dt * 20.0f);
+                p->vel = V2scale(V2sub(target_new_pos, p->pos), 1.0f / dt);
                 cpBodyApplyForceAtWorldPoint(g->body, v2_to_cp(V2scale(p->movement, 5.0f)), v2_to_cp(grid_com(g)));
                 // bigger the ship, the more efficient the spice usage
                 p->spice_taken_away += dt * 0.15f / (cpBodyGetMass(g->body) * 2.0f) * V2length(p->movement);
             }
+            p->pos = V2add(p->pos, V2scale(p->vel, dt));
+        }
+
+        if (p->dobuild)
+        {
+            p->dobuild = false; // handle the input. if didn't do this, after destruction of hovered box, would try to build on its grid with grid_index...
+
+            cpPointQueryInfo info = {0};
+            // @Robust make sure to query only against boxes...
+            V2 world_build = p->build;
+            if (p->grid_index != -1)
+            {
+                world_build = grid_local_to_world(&gs->grids[p->grid_index], p->build);
+            }
+            cpShape *nearest = cpSpacePointQueryNearest(gs->space, v2_to_cp(world_build), 0.01f, cpShapeFilterNew(CP_NO_GROUP, CP_ALL_CATEGORIES, CP_ALL_CATEGORIES), &info);
+            if (nearest != NULL)
+            {
+                struct Box *cur_box = (struct Box *)cpShapeGetUserData(nearest);
+                struct Grid *cur_grid = (struct Grid *)cpBodyGetUserData(cpShapeGetBody(nearest));
+                grid_remove_box(gs->space, cur_grid, cur_box);
+                p->spice_taken_away -= 0.1f;
+            }
+            else if (p->grid_index == -1)
+            {
+                // @Robust better memory mgmt
+                struct Grid *empty_grid = NULL;
+                for (int ii = 0; ii < MAX_GRIDS; ii++)
+                {
+                    if (gs->grids[ii].body == NULL)
+                    {
+                        empty_grid = &gs->grids[ii];
+                        break;
+                    }
+                }
+                assert(empty_grid != NULL);
+                p->spice_taken_away += 0.2f;
+                grid_new(empty_grid, gs, world_build);
+                box_new(&empty_grid->boxes[0], gs, empty_grid, (V2){0});
+                cpBodySetVelocity(empty_grid->body, v2_to_cp(p->vel));
+            }
+            else
+            {
+                struct Grid *g = &gs->grids[p->grid_index];
+
+                struct Box *empty_box = NULL;
+                for (int ii = 0; ii < MAX_BOXES_PER_GRID; ii++)
+                {
+                    if (g->boxes[ii].shape == NULL)
+                    {
+                        empty_box = &g->boxes[ii];
+                        break;
+                    }
+                }
+                // @Robust cleanly fail when not enough boxes
+                assert(empty_box != NULL);
+                p->spice_taken_away += 0.1f;
+                box_new(empty_box, gs, g, grid_world_to_local(g, world_build));
+            }
+        }
 
         if (p->spice_taken_away >= 1.0f)
         {

main.c

@@ -233,7 +233,7 @@ static void frame(void)
             }
             world_mouse_pos = V2sub(world_mouse_pos, (V2){.x = width / 2.0f, .y = height / 2.0f});
             world_mouse_pos.x /= zoom;
-            world_mouse_pos.y /= zoom;
+            world_mouse_pos.y /= -zoom;
             world_mouse_pos = V2add(world_mouse_pos, (V2){.x = camera_pos.x, .y = camera_pos.y});
         }
 
@@ -288,13 +288,25 @@ static void frame(void)
             struct ClientToServer curmsg = {0};
             V2 input = (V2){
                 .x = (float)keydown[SAPP_KEYCODE_D] - (float)keydown[SAPP_KEYCODE_A],
-                .y = (float)keydown[SAPP_KEYCODE_S] - (float)keydown[SAPP_KEYCODE_W],
+                .y = (float)keydown[SAPP_KEYCODE_W] - (float)keydown[SAPP_KEYCODE_S],
             };
             curmsg.movement = input;
             curmsg.inhabit = keypressed[SAPP_KEYCODE_G].pressed;
-            curmsg.build = build_preview.pos;
             curmsg.dobuild = mouse_pressed;
             curmsg.grid_index = grid_index;
+            if (curmsg.dobuild)
+            {
+                if (grid_index != -1)
+                {
+                    curmsg.build = grid_world_to_local(&gs.grids[curmsg.grid_index], build_preview.pos);
+                    V2 untransformed = grid_local_to_world(&gs.grids[curmsg.grid_index], curmsg.build);
+                    untransformed.x += 5.0f;
+                }
+                else
+                {
+                    curmsg.build = build_preview.pos;
+                }
+            }
 
             // @BeforeShip figure out why tf the possess ship key is so unreliable
             ENetPacket *packet = enet_packet_create((void *)&curmsg, sizeof(curmsg), ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT);
@@ -303,7 +315,7 @@ static void frame(void)
 
         // @BeforeShip client side prediction and rollback to previous server authoritative state, then replay inputs
         // no need to store copies of game state, just player input frame to frame. Then know how many frames ago the server game state arrived, it's that easy!
-        process(&gs, (float)sapp_frame_duration());
+        // process(&gs, (float)sapp_frame_duration());
     }
 
     // drawing
@@ -329,9 +341,10 @@ static void frame(void)
         }
 
         // sokol drawing library draw in world space
+        // world space coordinates are +Y up, -Y down. Like normal cartesian coords
         {
             sgp_translate(width / 2, height / 2);
-            sgp_scale_at(zoom, zoom, 0.0f, 0.0f);
+            sgp_scale_at(zoom, -zoom, 0.0f, 0.0f);
 
             // camera go to player
 
@@ -411,10 +424,6 @@ static void frame(void)
                     struct Box *b = &g->boxes[ii];
                     sgp_set_color(0.5f, 0.5f, 0.5f, 1.0f);
                     drawbox(grid_pos(g), grid_rotation(g), box_pos(b), b->damage, true);
-                    if (b->damage > 0.01f)
-                    {
-                        Log("Damage: %f\n", b->damage);
-                    }
                 }
                 sgp_set_color(1.0f, 0.0f, 0.0f, 1.0f);
                 V2 vel = grid_vel(&gs.grids[i]);
@@ -423,12 +432,13 @@ static void frame(void)
             }
         }
 
+        set_color(RED);
+        sgp_draw_filled_rect(1.0f, 0.5f, 0.3f, 0.3f);
+
         // gold target
         set_color(GOLD);
         sgp_draw_filled_rect(gs.goldpos.x, gs.goldpos.y, 0.1f, 0.1f);
 
-
-
         sgp_set_color(1.0f, 1.0f, 1.0f, 1.0f);
         dbg_drawall();
 

types.h

@@ -73,6 +73,7 @@ struct GameState
         V2 movement;
         bool inhabit;
 
+        // if grid_index != -1, this is in local coordinates to the grid
         V2 build; // @Robust this is messy, clean up?
         bool dobuild;
         int grid_index;
@@ -103,6 +104,8 @@ struct ClientToServer
 {
     V2 movement;
     bool inhabit;
+
+    // if grid_index != -1, this is in local coordinates to the grid
     V2 build;
     bool dobuild;
     int grid_index;
@@ -127,6 +130,8 @@ void grid_new(struct Grid *to_modify, struct GameState *gs, V2 pos);
 V2 grid_com(struct Grid *grid);
 V2 grid_pos(struct Grid *grid);
 V2 grid_vel(struct Grid *grid);
+V2 grid_local_to_world(struct Grid *grid, V2 local);
+V2 grid_world_to_local(struct Grid *grid, V2 world);
 V2 grid_snapped_box_pos(struct Grid *grid, V2 world); // returns the snapped pos in world coords
 float grid_rotation(struct Grid *grid);
 float grid_angular_velocity(struct Grid *grid);
@@ -268,4 +273,5 @@ static void set_color(Color c)
 }
 
 #define WHITE (Color){.r=1.0f,.g=1.0f,.b=1.0f,.a=1.0f}
+#define RED (Color){.r=1.0f,.g=0.0f,.b=0.0f,.a=1.0f}
 #define GOLD colhex(255, 215, 0)