Add battery block, used by thrusters

gamestate.c

@@ -324,6 +324,7 @@ void ser_grid(char **out, struct Grid *g)
             ser_int(out, g->boxes[i].type); // @Robust separate enum serialization that checks for out of bounds enum
             ser_int(out, g->boxes[i].rotation);
             ser_float(out, g->boxes[i].thrust);
+            ser_float(out, g->boxes[i].energy_used);
             ser_float(out, g->boxes[i].damage);
         }
     }
@@ -362,6 +363,7 @@ void des_grid(char **in, struct Grid *g, struct GameState *gs)
             des_int(in, (int *)&g->boxes[i].type);
             des_int(in, (int *)&g->boxes[i].rotation);
             des_float(in, &g->boxes[i].thrust);
+            des_float(in, &g->boxes[i].energy_used);
             des_float(in, &g->boxes[i].damage);
         }
     }
@@ -672,8 +674,7 @@ void process(struct GameState *gs, float dt)
                 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); // set vel correctly so newly built grids have the correct velocity copied from it
 
-                // set thruster forces from movement
+                // set thruster thrust from movement
-                float thruster_spice_consumption = 0.0f;
                 {
                     V2 target_direction = {0};
                     if (V2length(p->input.movement) > 0.0f)
@@ -688,14 +689,12 @@ void process(struct GameState *gs, float dt)
 
                         float wanted_thrust = -V2dot(target_direction, thruster_direction(&g->boxes[ii]));
                         wanted_thrust = clamp01(wanted_thrust);
-                        thruster_spice_consumption += wanted_thrust;
+
                         g->boxes[ii].thrust = wanted_thrust;
                     }
                 }
-
                 // cpBodyApplyForceAtWorldPoint(g->body, v2_to_cp(V2scale(p->input.movement, 5.0f)), v2_to_cp(grid_com(g)));
                 // bigger the ship, the more efficient the spice usage
-                p->spice_taken_away += dt * thruster_spice_consumption * THRUSTER_SPICE_PER_SECOND;
             }
             p->pos = V2add(p->pos, V2scale(p->vel, dt));
         }
@@ -775,12 +774,44 @@ void process(struct GameState *gs, float dt)
     for (int i = 0; i < MAX_GRIDS; i++)
     {
         SKIPNULL(gs->grids[i].body);
+
+        struct Box *batteries[MAX_BOXES_PER_GRID] = {0};
+        int cur_battery = 0;
+        for (int ii = 0; ii < MAX_BOXES_PER_GRID; ii++)
+        {
+            SKIPNULL(gs->grids[i].boxes[ii].shape);
+            if (gs->grids[i].boxes[ii].type == BoxBattery)
+            {
+                assert(cur_battery < MAX_BOXES_PER_GRID);
+                batteries[cur_battery] = &gs->grids[i].boxes[ii];
+                cur_battery++;
+            }
+        }
+        int batteries_len = cur_battery;
+
+        float thruster_energy_consumption_per_second = 0.0f;
         for (int ii = 0; ii < MAX_BOXES_PER_GRID; ii++)
         {
             SKIPNULL(gs->grids[i].boxes[ii].shape);
             if (gs->grids[i].boxes[ii].type == BoxThruster)
             {
-                cpBodyApplyForceAtWorldPoint(gs->grids[i].body, v2_to_cp(thruster_force(&gs->grids[i].boxes[ii])), v2_to_cp(box_pos(&gs->grids[i].boxes[ii])));
+                float energy_to_consume = gs->grids[i].boxes[ii].thrust * THRUSTER_ENERGY_USED_PER_SECOND * dt;
+                struct Box *max_capacity_battery = NULL;
+                float max_capacity_battery_energy_used = 1.0f;
+                for (int iii = 0; iii < batteries_len; iii++)
+                {
+                    if (batteries[iii]->energy_used < max_capacity_battery_energy_used)
+                    {
+                        max_capacity_battery = batteries[iii];
+                        max_capacity_battery_energy_used = batteries[iii]->energy_used;
+                    }
+                }
+
+                if (max_capacity_battery != NULL && (1.0f - max_capacity_battery->energy_used) > energy_to_consume)
+                {
+                    max_capacity_battery->energy_used += energy_to_consume;
+                    cpBodyApplyForceAtWorldPoint(gs->grids[i].body, v2_to_cp(thruster_force(&gs->grids[i].boxes[ii])), v2_to_cp(box_pos(&gs->grids[i].boxes[ii])));
+                }
             }
         }
     }

main.c

@@ -57,6 +57,10 @@ static struct BoxInfo
     {
         .type = BoxThruster,
         .image_path = "loaded/thruster.png",
+    },
+    {
+        .type = BoxBattery,
+        .image_path = "loaded/battery.png",
     }};
 const int boxes_len = sizeof(boxes) / sizeof(*boxes);
 
@@ -192,13 +196,6 @@ static void drawbox(V2 boxpos, float rot, float damage, enum BoxType type, enum
     sgp_draw_textured_rect(boxpos.x - halfbox, boxpos.y - halfbox, BOX_SIZE, BOX_SIZE);
     sgp_reset_image(0);
 
-    /*sgp_draw_line(bpos.x - halfbox, bpos.y - halfbox, bpos.x - halfbox, bpos.y + halfbox); // left
-    sgp_draw_line(bpos.x - halfbox, bpos.y - halfbox, bpos.x + halfbox, bpos.y - halfbox); // top
-    sgp_draw_line(bpos.x + halfbox, bpos.y - halfbox, bpos.x + halfbox, bpos.y + halfbox); // right
-    sgp_draw_line(bpos.x - halfbox, bpos.y + halfbox, bpos.x + halfbox, bpos.y + halfbox); // bottom
-    sgp_draw_line(bpos.x - halfbox, bpos.y - halfbox, bpos.x + halfbox, bpos.y + halfbox); // diagonal
-    */
-
     if (damage > 0.0f)
     {
         sgp_set_color(0.5f, 0.1f, 0.1f, damage);
@@ -553,7 +550,7 @@ static void frame(void)
                     {
                         SKIPNULL(g->boxes[ii].shape);
                         struct Box *b = &g->boxes[ii];
-                        sgp_set_color(0.5f, 0.5f, 0.5f, 1.0f);
+                        sgp_set_color(1.0f, 1.0f, 1.0f, 1.0f);
                         // debug draw force vectors for thrusters
                         if (false)
                         {
@@ -563,6 +560,14 @@ static void frame(void)
                                 dbg_line(box_pos(b), V2add(box_pos(b), V2scale(thruster_force(b), -1.0f)));
                             }
                         }
+                        if(b->type == BoxBattery)
+                        {
+                            float cur_alpha = sgp_get_color().a;
+                            Color from = WHITE;
+                            Color to = colhex(255, 0, 0);
+                            Color result = Collerp(from, to, b->energy_used);
+                            sgp_set_color(result.r, result.g, result.b, cur_alpha);
+                        }
                         drawbox(box_pos(b), grid_rotation(g), b->damage, b->type, b->rotation);
                     }
                     sgp_set_color(1.0f, 0.0f, 0.0f, 1.0f);

thirdparty/sokol_gp.h

@@ -543,6 +543,7 @@ SOKOL_GP_API_DECL void sgp_reset_uniform(void);                             /* R
 SOKOL_GP_API_DECL void sgp_set_blend_mode(sgp_blend_mode blend_mode);       /* Sets current blend mode. */
 SOKOL_GP_API_DECL void sgp_reset_blend_mode(void);                          /* Resets current blend mode to default (no blending). */
 SOKOL_GP_API_DECL void sgp_set_color(float r, float g, float b, float a);   /* Sets current color modulation. */
+SOKOL_GP_API_DECL sgp_color sgp_get_color();                                /* Gets the current color modulation */
 SOKOL_GP_API_DECL void sgp_reset_color(void);                               /* Resets current color modulation to default (white). */
 SOKOL_GP_API_DECL void sgp_set_image(int channel, sg_image image);          /* Sets current bound texture in a texture channel. */
 SOKOL_GP_API_DECL void sgp_unset_image(int channel);                        /* Remove current bound texture in a texture channel (no texture). */
@@ -1622,6 +1623,13 @@ void sgp_set_color(float r, float g, float b, float a) {
     }
 }
 
+sgp_color sgp_get_color()
+{
+    SOKOL_ASSERT(_sgp.init_cookie == _SGP_INIT_COOKIE);
+    SOKOL_ASSERT(_sgp.cur_state > 0);
+    return _sgp.state.color;
+}
+
 void sgp_reset_color(void) {
     SOKOL_ASSERT(_sgp.init_cookie == _SGP_INIT_COOKIE);
     sgp_set_color(1.0f, 1.0f, 1.0f, 1.0f);

types.h

@@ -9,7 +9,7 @@
 #define MAX_BOXES_PER_GRID 32
 #define BOX_MASS 1.0f
 #define THRUSTER_FORCE 4.0f
-#define THRUSTER_SPICE_PER_SECOND 0.02f
+#define THRUSTER_ENERGY_USED_PER_SECOND 0.05f
 
 #define TIMESTEP (1.0f / 60.0f) // not required to simulate at this, but this defines what tick the game is on
 #define TIME_BETWEEN_INPUT_PACKETS (1.0f / 20.0f)
@@ -67,7 +67,8 @@ enum BoxType
 {
     BoxHullpiece,
     BoxThruster,
-    BoxLast
+    BoxBattery,
+    BoxLast,
 };
 
 enum Rotation
@@ -134,6 +135,9 @@ struct GameState
             // thruster
             float thrust; // must be between 0 and 1
             
+            // battery
+            float energy_used; // must be between 0 and 1
+
             cpShape *shape;
             float damage;
         } boxes[MAX_BOXES_PER_GRID]; // @Robust this needs to be dynamically allocated, huge disparity in how many blocks a body can have...