fp: Add camera shake

feely_pona.cpp

@@ -1996,6 +1996,24 @@ void FP_Update(TELY_Platform *platform, FP_Game *game, TELY_PlatformInput *input
 
                 if (entity->flags & FP_GameEntityFlag_CameraTracking) {
                     FP_GameCamera *camera    = &game->play.camera;
+
+                    // NOTE: calculate camera position based on camera shake
+                    Dqn_V2 camera_position = camera->world_pos;
+                    if (camera->shake_duration > 0) {
+                        Dqn_f32 offset_x = (Dqn_PCG32_NextF32(&game->play.rng) * 1000 - 500) * camera->shake_intensity;
+                        Dqn_f32 offset_y = (Dqn_PCG32_NextF32(&game->play.rng) * 1000 - 500) * camera->shake_intensity;
+
+                        camera_position.x += offset_x;
+                        camera_position.y += offset_y;
+
+                        camera->shake_duration -= input->delta_s;
+                    }
+
+                    Dqn_f64 camera_smoothing = 5.0f;
+
+                    camera->world_pos.x += (camera_position.x - camera->world_pos.x) * (camera_smoothing * input->delta_s);
+                    camera->world_pos.y += (camera_position.y - camera->world_pos.y) * (camera_smoothing * input->delta_s);
+
                     camera->world_pos_target = FP_Game_CalcEntityWorldPos(game, entity->handle) * camera->scale;
                 }
 
@@ -2245,12 +2263,19 @@ void FP_Update(TELY_Platform *platform, FP_Game *game, TELY_PlatformInput *input
                 }
 
                 defender->hp           = defender->hp >= attacker->base_attack ? defender->hp - attacker->base_attack : 0;
+                defender->hit_on_frame = game->play.update_counter;
+
+                if (game->play.player == defender->handle) {
+                    game->play.camera.shake_intensity = 0.1f;
+                    game->play.camera.shake_duration  = 0.25f;
+                }
+
                 if (defender->hp <= 0) {
                     if (!defender->is_dying) {
                         FP_GameEntity *coin_receiver = FP_Game_GetEntity(game, attacker->projectile_owner);
                         if (FP_Game_IsNilEntity(coin_receiver))
                             coin_receiver = attacker;
-                        coin_receiver->coins += 1;
+                        coin_receiver->coins += 2;
                     }
                     defender->is_dying = true;
                 }
@@ -2433,13 +2458,26 @@ void FP_Render(FP_Game *game, TELY_Platform *platform, TELY_Renderer *renderer,
             if (sprite.flip & TELY_AssetFlip_Y)
                 dest_rect.size.h *= -1.f; // NOTE: Flip the texture vertically
 
+            Dqn_V4 sprite_colour = TELY_COLOUR_WHITE_V4;
+            if (entity->hit_on_frame) {
+                DQN_ASSERT(game->play.update_counter >= entity->hit_on_frame);
+                Dqn_usize       frames_elapsed_since_hit = game->play.update_counter - entity->hit_on_frame;
+                Dqn_usize const HIT_CONFIRM_DURATION     = 8;
+                if (frames_elapsed_since_hit < HIT_CONFIRM_DURATION) {
+                    sprite_colour   = TELY_COLOUR_RED_V4;
+                    sprite_colour.g = ((1.f / HIT_CONFIRM_DURATION) * frames_elapsed_since_hit);
+                    sprite_colour.b = ((1.f / HIT_CONFIRM_DURATION) * frames_elapsed_since_hit);
+                }
+            }
+
+            sprite_colour.a *= entity->action.sprite_alpha;
             TELY_Render_TextureColourV4(renderer,
                                         sprite.sheet->tex_handle,
                                         src_rect,
                                         dest_rect,
                                         Dqn_V2_Zero /*rotate origin*/,
                                         0.f /*rotate radians*/,
-                                        TELY_Colour_V4Alpha(TELY_COLOUR_WHITE_V4, entity->action.sprite_alpha));
+                                        sprite_colour);
 
             if (entity->converted_faction) {
                 Dqn_V2 label_p = Dqn_Rect_InterpolatedPoint(dest_rect, Dqn_V2_InitNx2(0, -0.25f));

feely_pona_game.h

@@ -195,6 +195,7 @@ struct FP_GameEntity
     Dqn_V2                                attack_box_size;
     Dqn_V2                                attack_box_offset;
     bool                                  attack_processed;
+    Dqn_usize                             hit_on_frame;
     bool                                  is_dying;
     uint64_t                              last_attack_timestamp;
     uint64_t                              attack_cooldown_ms;
@@ -260,6 +261,8 @@ struct FP_GameCamera
     Dqn_V2  world_pos_target;
     Dqn_f32 rotate_rads;
     Dqn_V2  scale;
+    Dqn_f32 shake_intensity;
+    Dqn_f64 shake_duration;
 };
 
 enum FP_GameAudio