From a12a7d218b00c4ed44819ac8f0dd05bbf42204c7 Mon Sep 17 00:00:00 2001
From: doyle <doyle.github.2ifxi@simplelogin.com>
Date: Thu, 21 Sep 2023 17:11:07 +1000
Subject: [PATCH] fp: Add dashing

---
 feely_pona.cpp | 32 +++++++++++++++++++++++++++++---
 feely_pona.h   |  1 +
 2 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/feely_pona.cpp b/feely_pona.cpp
index 89f5f0b..8f7b4ff 100644
--- a/feely_pona.cpp
+++ b/feely_pona.cpp
@@ -660,7 +660,8 @@ void FP_GameUpdate(TELY_Platform *platform, FP_Game *game, TELY_Renderer *render
 
         // NOTE: Move entity by keyboard ===========================================================
         Dqn_V2 acceleration = {};
-        if (game->clicked_entity == entity->handle) {
+        if (game->clicked_entity == entity->handle &&
+            (entity->action.state == FP_GameEntityState_Run || entity->action.state == FP_GameEntityState_Idle)) {
             if (entity->flags & FP_EntityFlag_MoveByKeyboard) {
                 acceleration = dir_vector * 10000000.f;
                 if (dir_vector.x)
@@ -840,6 +841,7 @@ void FP_GameUpdate(TELY_Platform *platform, FP_Game *game, TELY_Renderer *render
         {
             bool we_are_clicked_entity  = entity->handle == game->clicked_entity;
             bool action_has_finished    = action->timer_s != FP_GAME_ENTITY_ACTION_INFINITE_TIMER && action->timer_s >= action->end_at_s;
+            bool entity_has_velocity    = entity->velocity.x || entity->velocity.y;
 
             if (action->state == FP_GameEntityState_Nil)
                 FP_Game_EntityActionSetState(action, FP_GameEntityState_Idle);
@@ -907,7 +909,31 @@ void FP_GameUpdate(TELY_Platform *platform, FP_Game *game, TELY_Renderer *render
                 } else if (we_are_clicked_entity) {
                     if (TELY_Platform_InputScanCodeIsPressed(input, TELY_PlatformInputScanCode_J)) {
                         FP_Game_EntityActionSetState(action, FP_GameEntityState_AttackA);
-                    } else if (dir_vector.x == 0.f && dir_vector.y == 0.f) {
+                    } else if (TELY_Platform_InputScanCodeIsPressed(input, TELY_PlatformInputScanCode_LeftShift)) {
+                        FP_Game_EntityActionSetState(action, FP_GameEntityState_Dash);
+                    }
+                }
+
+                if ((action_has_finished && !entity_has_velocity) || (we_are_clicked_entity && dir_vector.x == 0.f && dir_vector.y == 0.f)) {
+                    FP_Game_EntityActionSetState(action, FP_GameEntityState_Idle);
+                }
+            }
+
+            if (action->state == FP_GameEntityState_Dash) {
+                if (action->flags & FP_GameEntityActionFlag_StateTransition) {
+                    TELY_AssetSpriteAnimation *anim = entity->sprite_anims.data + TELY_Asset_GetSpriteAnimation(entity->sprite_anims, DQN_STRING8("Floor slide")).index;
+                    FP_Game_EntityActionReset(action, anim->count * anim->seconds_per_frame, anim);
+
+                    Dqn_V2 dash_dir          = {entity->facing_left ? -1.f : 1.f, 0.f};
+                    Dqn_V2 dash_acceleration = dash_dir * 400'000'000.f;
+                    Dqn_f32 t                = DQN_CAST(Dqn_f32)DQN_SQUARED(input->delta_s);
+                    entity->velocity         = (dash_acceleration * t) + entity->velocity * 2.0f;
+
+                } else if (action_has_finished) {
+                    if (entity_has_velocity) {
+                        // TODO(doyle): Not sure if this branch triggers properly.
+                        FP_Game_EntityActionSetState(action, FP_GameEntityState_Run);
+                    } else {
                         FP_Game_EntityActionSetState(action, FP_GameEntityState_Idle);
                     }
                 }
@@ -967,7 +993,7 @@ void FP_GameUpdate(TELY_Platform *platform, FP_Game *game, TELY_Renderer *render
             else
                 attack_dir_vector.x = -1.f;
 
-            Dqn_V2 acceleration  = attack_dir_vector * 500000.f;
+            Dqn_V2 acceleration  = attack_dir_vector * 500'000.f;
             Dqn_f32 t            = DQN_CAST(Dqn_f32)DQN_SQUARED(input->delta_s);
             Dqn_f32 t_squared    = DQN_SQUARED(t);
 
diff --git a/feely_pona.h b/feely_pona.h
index 798f92f..376bcb0 100644
--- a/feely_pona.h
+++ b/feely_pona.h
@@ -50,6 +50,7 @@ enum FP_GameEntityState
     FP_GameEntityState_AttackB,
     FP_GameEntityState_AttackC,
     FP_GameEntityState_Run,
+    FP_GameEntityState_Dash,
 };
 
 struct FP_GameWaypoint