dash particles

src/enemies.c

@@ -90,7 +90,6 @@ entity_t *enemy_spawn(int enemy_id, int level)
     e->movement.facing = DOWN;
     e->movement.dash = 0;
     e->movement.dash_facing = DOWN;
-    e->movement.dash_particle_cooldown = fix(0);
 
     e->movement_params = &data->movement_params;
     entity_set_anim(e, data->anim_idle);

src/entities.c

@@ -37,7 +37,6 @@ void entity_dash(entity_t *e, int direction)
 
     move->dash = params->dash_duration;
     move->dash_facing = direction;
-    move->dash_particle_cooldown = fix(0);
 }
 
 bool entity_dashing(entity_t const *e)
@@ -53,11 +52,11 @@ bool entity_dashing(entity_t const *e)
     if(move->dash > 0)
         return true;
 
-    /* Also true as long as over-speed is maintained */
-    fixed_t cur_v2 = fmul(move->x, move->x) + fmul(move->y, move->y);
+    /* Also true as long as 1.5x over-speed is maintained */
+    fixed_t cur_v2 = fmul(move->vx, move->vx) + fmul(move->vy, move->vy);
     fixed_t max_v2 = fmul(params->max_speed, params->max_speed);
 
-    if(move->dash < 0 && cur_v2 > max_v2)
+    if(move->dash < 0 && 2 * cur_v2 > 3 * max_v2)
         return true;
 
     return false;

src/entities.h

@@ -39,8 +39,6 @@ typedef struct {
     uint8_t facing;
     /* Dash direction */
     uint8_t dash_facing;
-    /* Cooldown until next dash particle */
-    fixed_t dash_particle_cooldown;
 
 } entity_movement_t;
 

src/game.c

@@ -197,7 +197,6 @@ void game_try_move_entity(game_t *g, entity_t *e,
         m->vx = next->vx / 2;
         m->vy = next->vy / 2;
         m->dash = next->dash;
-        m->dash_particle_cooldown = next->dash_particle_cooldown;
     }
 }
 
@@ -247,27 +246,17 @@ void game_update_particles(game_t *g, fixed_t dt)
     }
 
     /* Spawn dash particles */
-#if 0
     for(int i = 0; i < g->entity_count; i++) {
         entity_t *e = g->entities[i];
 
         if(entity_dashing(e)) {
-            e->movement.dash_particle_cooldown -= dt;
-
-            if(e->movement.dash_particle_cooldown < 0) {
-                particle_dash_t *p = malloc(sizeof *p);
-                p->particle.type = PARTICLE_DASH;
-                p->particle.age = 0;
-                p->particle.pos = entity_pos(e);
-                extern anim_frame_t anim_player_dash_trail_right[];
-                p->frame = e->anim.frame;
-                game_add_particle(g, &p->particle);
-
-                e->movement.dash_particle_cooldown = fix(25)/100;
-            }
+            particle_dash_t *p = malloc(sizeof *p);
+            p->particle.type = PARTICLE_DASH;
+            p->particle.age = 0;
+            p->particle.pos = entity_pos(e);
+            game_add_particle(g, &p->particle);
         }
     }
-#endif
 }
 
 /* Compare the y values of two entities. */

src/main.c

@@ -135,9 +135,8 @@ int main(void)
         if(game.time_victory != 0) dprint(1, 1, C_WHITE, "Victory in %.1f s!",
             f2double(game.time_victory));
         else if(game.time_defeat != 0) dprint(1, 1, C_WHITE, "Defeat! :(");
-        else dprint(1, 1, C_WHITE, "HP:%d  ATK:%d  DEF:%d  dpc:%.1f",
-            player->HP, player->ATK, player->DEF,
-            f2double(player->movement.dash_particle_cooldown));
+        else dprint(1, 1, C_WHITE, "HP:%d  ATK:%d  DEF:%d",
+            player->HP, player->ATK, player->DEF);
 
         /* Developer/tweaking menu */
         if(debug.show_vars) {

src/particles.c

@@ -35,13 +35,21 @@ static void damage_render(int x, int y, particle_damage_t *p)
 
 static bool dash_update(particle_dash_t *p, GUNUSED fixed_t dt)
 {
-    return p->particle.age >= 500;
+    return p->particle.age >= 256;
 }
 
 static void dash_render(int x, int y, particle_dash_t *p)
 {
-    if(!p->frame) return;
-    anim_frame_render(x, y, p->frame);
+    /* 32 * (1 - age/256) */
+    int radius = 32 - (p->particle.age >> 3);
+
+    for(int dx = -5; dx <= +5; dx++)
+    for(int dy = -5; dy <= +5; dy++) {
+        if(dx * dx + dy * dy <= radius) {
+            int index = 396 * (y + dy) + (x + dx);
+            gint_vram[index] = ~((~gint_vram[index] & 0xf7de) >> 1);
+        }
+    }
 }
 
 //---

src/particles.h

@@ -50,7 +50,5 @@ typedef struct {
 /* Dash trail particles */
 typedef struct {
     particle_t particle;
-    /* Source sprite */
-    anim_frame_t const *frame;
 
 } particle_dash_t;