From 9fc88a91af0dfc3f3e2b9b3c1f16bc507d61f087 Mon Sep 17 00:00:00 2001
From: Miloslav Ciz <drummyfish@disroot.org>
Date: Sun, 15 Dec 2024 22:09:22 +0100
Subject: [PATCH] Start fans

---
 assets.h |  2 +-
 map.h    |  5 +++++
 racing.h | 28 +++++++++++++++++++++++-----
 3 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/assets.h b/assets.h
index 17e9fe7..f56a5a0 100644
--- a/assets.h
+++ b/assets.h
@@ -40,7 +40,7 @@ static const char *LCR_maps[] =
   "#=f0s0 #f11d0"
   "#=c0p0 #f11d0"
 
-"#>C0s0 #fd190" // big dirt
+"#oC0s0 #fd190" // big dirt
 //  "#=C0s1 #fd190" // big dirt
   "#=M0s2 #fd190" // big grass
   "#=W0s3 #fd190" // big ice
diff --git a/map.h b/map.h
index f9389fe..29abb06 100644
--- a/map.h
+++ b/map.h
@@ -642,6 +642,11 @@ uint8_t LCR_mapBlockIsAccelerator(uint8_t block)
   return block == LCR_BLOCK_FULL_ACCEL;
 }
 
+uint8_t LCR_mapBlockIsFan(uint8_t block)
+{
+  return block == LCR_BLOCK_FULL_FAN;
+}
+
 /**
   Macro that transforms coordinates according to block transformation.
 */
diff --git a/racing.h b/racing.h
index ef8bafe..5960e50 100644
--- a/racing.h
+++ b/racing.h
@@ -30,6 +30,8 @@ typedef int32_t LCR_GameUnit;  ///< abstract game unit
 // TODO: move some of this to constants?
 
 #define LCR_GRAVITY (LCR_PHYSICS_UNIT / 160)
+#define LCR_FAN_FORCE 3
+#define LCR_FAN_FORCE_DECREASE 6
 
 #define LCR_CAR_FORWARD_FRICTION (TPE_F / 180)
 #define LCR_CAR_AIR_FRICTION 32
@@ -71,6 +73,7 @@ struct
   TPE_Vec3 carOKPositions[LCR_CAR_JOINTS];
   uint8_t carNotOKCount;
 
+  TPE_Unit fanForce;        ///* Upwards acceleration caused by a fan.
 
   LCR_GameUnit wheelRotation;
   LCR_GameUnit wheelSteer;
@@ -514,6 +517,7 @@ void LCR_racingRestart(void)
   LCR_LOG0("restarting race");
 
   LCR_racing.tick = 0;
+  LCR_racing.fanForce = 0;
 
   TPE_bodyActivate(&(LCR_racing.carBody));
   LCR_racing.wheelCollisions = 0;
@@ -786,8 +790,13 @@ uint32_t LCR_racingStep(unsigned int input)
 
     if (groundBlockIndex != -1)
     {
-      onAccel = LCR_mapBlockIsAccelerator(
-        LCR_currentMap.blocks[groundBlockIndex * LCR_BLOCK_SIZE]);
+      uint8_t b = LCR_currentMap.blocks[groundBlockIndex * LCR_BLOCK_SIZE];
+
+      onAccel = LCR_mapBlockIsAccelerator(b);
+
+      if (LCR_mapBlockIsFan(b))
+        LCR_racing.fanForce = LCR_GRAVITY * LCR_FAN_FORCE;
+
       groundMat = LCR_mapBlockGetMaterial(
         LCR_currentMap.blocks + groundBlockIndex * LCR_BLOCK_SIZE);
     }
@@ -946,13 +955,22 @@ uint32_t LCR_racingStep(unsigned int input)
     LCR_racing.wheelSteer /= 2;
 
   LCR_racing.wheelCollisions <<= 4;
-  
+
+  if (LCR_racing.fanForce)
+  {
+    TPE_bodyAccelerate(&(LCR_racing.carBody),TPE_vec3(0,LCR_racing.fanForce,0));
+
+
+    LCR_racing.fanForce -= LCR_GRAVITY / LCR_FAN_FORCE_DECREASE;
+
+    if (LCR_racing.fanForce < 0)
+      LCR_racing.fanForce = 0;
+  }
+
   LCR_LOG2("gonna step physics engine");
   TPE_worldStep(&(LCR_racing.physicsWorld));
   LCR_LOG2("stepping physics engine done");
 
-
-
   LCR_racing.carSpeed = (TPE_vec3Len(carVel) * LCR_GAME_UNIT)
     / LCR_PHYSICS_UNIT;