fp: Add camera shake

feely_pona.cpp

@@ -480,7 +480,7 @@ static void FP_PlayReset(FP_Game *game, TELY_Platform *platform)
     FP_Entity_CreateBillboard(game, Dqn_V2_InitNx2(1898,  771),  FP_EntityBillboardState_Strafe,      "Strafe Billboard");
 
     // NOTE: Camera ================================================================================
-    play->camera.world_pos = base_mid_p - Dqn_V2_InitV2I(platform->core.window_size * .5f);
+    play->camera.world_pos = {};
     play->camera.scale     = Dqn_V2_InitNx1(1);
     play->camera.size      = Dqn_V2_InitNx2(1826, 1046);
 }
@@ -1995,8 +1995,26 @@ void FP_Update(TELY_Platform *platform, FP_Game *game, TELY_PlatformInput *input
                 }
 
                 if (entity->flags & FP_GameEntityFlag_CameraTracking) {
-                    FP_GameCamera *camera = &game->play.camera;
-                    camera->world_pos     = FP_Game_CalcEntityWorldPos(game, entity->handle) * camera->scale;
+                    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;
                 }
 
                 FP_GamePlaceableBuilding placeable_building = PLACEABLE_BUILDINGS[game->play.build_mode_building_index];
@@ -2244,13 +2262,20 @@ void FP_Update(TELY_Platform *platform, FP_Game *game, TELY_PlatformInput *input
                         continue;
                 }
 
-                defender->hp = defender->hp >= attacker->base_attack ? defender->hp - attacker->base_attack : 0;
+                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;
                 }
@@ -2290,11 +2315,12 @@ void FP_Update(TELY_Platform *platform, FP_Game *game, TELY_PlatformInput *input
         }
     }
 
+    // NOTE: Camera ================================================================================
+    FP_GamePlay *play     = &game->play;
+    FP_GameCamera *camera = &play->camera;
     if (!FP_Game_IsNilEntityHandle(game, game->play.clicked_entity)) {
         Dqn_V2       window_size  = Dqn_V2_InitV2I(platform->core.window_size);
-        FP_GamePlay *play         = &game->play;
 
-        FP_GameCamera *camera     = &play->camera;
         camera->scale             = window_size / camera->size;
         Dqn_V2 camera_size_screen = camera->size * camera->scale;
 
@@ -2302,12 +2328,13 @@ void FP_Update(TELY_Platform *platform, FP_Game *game, TELY_PlatformInput *input
         Dqn_V2 map_screen_size      = map_world_size * camera->scale;
         Dqn_V2 half_map_screen_size = map_screen_size * .5f;
 
-        camera->world_pos.x = DQN_MIN(camera->world_pos.x,  half_map_screen_size.w - (camera_size_screen.w * .5f));
-        camera->world_pos.x = DQN_MAX(camera->world_pos.x, -half_map_screen_size.w + (camera_size_screen.w * .5f));
-        camera->world_pos.y = DQN_MAX(camera->world_pos.y, -half_map_screen_size.h + (camera_size_screen.h * .5f));
-        camera->world_pos.y = DQN_MIN(camera->world_pos.y,  half_map_screen_size.h - (camera_size_screen.h * .5f));
+        camera->world_pos_target.x = DQN_MIN(camera->world_pos_target.x,  half_map_screen_size.w - (camera_size_screen.w * .5f));
+        camera->world_pos_target.x = DQN_MAX(camera->world_pos_target.x, -half_map_screen_size.w + (camera_size_screen.w * .5f));
+        camera->world_pos_target.y = DQN_MAX(camera->world_pos_target.y, -half_map_screen_size.h + (camera_size_screen.h * .5f));
+        camera->world_pos_target.y = DQN_MIN(camera->world_pos_target.y,  half_map_screen_size.h - (camera_size_screen.h * .5f));
     }
 
+    camera->world_pos += (camera->world_pos_target - camera->world_pos) * (5.f * DQN_CAST(Dqn_f32)input->delta_s);
     Dqn_Profiler_EndZone(update_zone);
 }
 
@@ -2431,13 +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));
@@ -3600,8 +3640,8 @@ void FP_Render(FP_Game *game, TELY_Platform *platform, TELY_Renderer *renderer,
         TELY_Render_TextF(renderer, draw_p, Dqn_V2_Zero, "  F9  %s god mode", game->play.god_mode ? "Disable" : "Enable"); draw_p.y += TELY_Render_FontHeight(renderer, assets);
         TELY_Render_TextF(renderer, draw_p, Dqn_V2_Zero, "  F10 %s noclip", player->flags & FP_GameEntityFlag_NoClip ? "Disable" : "Enable"); draw_p.y += TELY_Render_FontHeight(renderer, assets);
         TELY_Render_TextF(renderer, draw_p, Dqn_V2_Zero, "  F11 Building inventory +1"); draw_p.y += TELY_Render_FontHeight(renderer, assets);
-        TELY_Render_TextF(renderer, draw_p, Dqn_V2_Zero, "  F12 %s by enemies", player->faction == FP_GameEntityFaction_Nil ? "Attacked" : "Ignored"); draw_p.y += TELY_Render_FontHeight(renderer, assets);
         TELY_Render_TextF(renderer, draw_p, Dqn_V2_Zero, "  1   %s HUD", game->play.debug_hide_hud ? "Show" : "Hide"); draw_p.y += TELY_Render_FontHeight(renderer, assets);
+        TELY_Render_TextF(renderer, draw_p, Dqn_V2_Zero, "  2   %s by enemies", player->faction == FP_GameEntityFaction_Nil ? "Attacked" : "Ignored"); draw_p.y += TELY_Render_FontHeight(renderer, assets);
         TELY_Render_PopFont(renderer);
         TELY_Render_PopColourV4(renderer);
 
@@ -3656,14 +3696,15 @@ void FP_Render(FP_Game *game, TELY_Platform *platform, TELY_Renderer *renderer,
             player->inventory.kennels  += 1;
         }
 
-        if (TELY_Platform_InputScanCodeIsPressed(input, TELY_PlatformInputScanCode_F12)) {
+        if (TELY_Platform_InputScanCodeIsPressed(input, TELY_PlatformInputScanCode_1))
+            game->play.debug_hide_hud = !game->play.debug_hide_hud;
+
+        if (TELY_Platform_InputScanCodeIsPressed(input, TELY_PlatformInputScanCode_2)) {
             player->faction = player->faction == FP_GameEntityFaction_Nil
                                   ? FP_GameEntityFaction_Friendly
                                   : FP_GameEntityFaction_Nil;
         }
 
-        if (TELY_Platform_InputScanCodeIsPressed(input, TELY_PlatformInputScanCode_1))
-            game->play.debug_hide_hud = !game->play.debug_hide_hud;
     }
 }
 

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;
@@ -257,8 +258,11 @@ struct FP_GameCamera
 {
     Dqn_V2  size;
     Dqn_V2  world_pos;
+    Dqn_V2  world_pos_target;
     Dqn_f32 rotate_rads;
     Dqn_V2  scale;
+    Dqn_f32 shake_intensity;
+    Dqn_f64 shake_duration;
 };
 
 enum FP_GameAudio