From b672387bee88471aa47d4736dcc47f01ff812715 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miloslav=20=C4=8C=C3=AD=C5=BE?= <tastyfish@seznam.cz>
Date: Fri, 14 Sep 2018 20:17:15 +0200
Subject: [PATCH] Optimize door

---
 raycastlib.h | 40 +++++++++++++++++++++++-----------------
 1 file changed, 23 insertions(+), 17 deletions(-)

diff --git a/raycastlib.h b/raycastlib.h
index 8e1af3d..d4ad357 100644
--- a/raycastlib.h
+++ b/raycastlib.h
@@ -130,6 +130,7 @@ typedef struct
   Unit     textureCoord; ///< Normalized (0 to UNITS_PER_SQUARE - 1) tex coord.
   Unit     type;         ///< Integer identifying type of square.
   uint8_t  direction;    ///< Direction of hit.
+  Unit     doorRoll;     ///< Holds value of door roll.
 } HitResult;
 
 // TODO: things like FOV could be constants to make them precomp. and faster?
@@ -308,6 +309,22 @@ void moveCameraWithCollision(Camera *camera, Vector2D planeOffset,
 //=============================================================================
 // privates
 
+// global helper variables, for precomputing stuff etc.
+PixelFunction _pixelFunction = 0;
+Camera _camera;
+Unit _horizontalDepthStep = 0; 
+Unit _startFloorHeight = 0;
+Unit _startCeilHeight = 0;
+Unit _camResYLimit = 0;
+Unit _middleRow = 0;
+ArrayFunction _floorFunction = 0;
+ArrayFunction _ceilFunction = 0;
+uint8_t _computeTextureCoords = 0;
+Unit _fHorizontalDepthStart = 0;
+Unit _cHorizontalDepthStart = 0;
+int16_t _cameraHeightScreen = 0;
+ArrayFunction _rollFunction = 0; // says door rolling
+
 #ifdef RAYCASTLIB_PROFILE
   // function call counters for profiling
   uint32_t profile_sqrtInt = 0;
@@ -665,6 +682,8 @@ void castRayMultiHit(Ray ray, ArrayFunction arrayFunc, ArrayFunction typeFunc,
 
       HitResult h;
 
+      h.doorRoll = 0;
+
       h.position = currentPos;
       h.square   = currentSquare;
       h.distance = dist(initialPos,currentPos);
@@ -697,6 +716,9 @@ void castRayMultiHit(Ray ray, ArrayFunction arrayFunc, ArrayFunction typeFunc,
           wrap(currentPos.y,UNITS_PER_SQUARE) : 0;
       }
 
+      if (_rollFunction != 0)
+        h.doorRoll = _rollFunction(currentSquare.x,currentSquare.y);
+
       hitResults[*hitResultsLen] = h;
 
       *hitResultsLen += 1;
@@ -767,22 +789,6 @@ void castRaysMultiHit(Camera cam, ArrayFunction arrayFunc,
   }
 }
 
-// global helper variables, for precomputing stuff etc.
-PixelFunction _pixelFunction = 0;
-Camera _camera;
-Unit _horizontalDepthStep = 0; 
-Unit _startFloorHeight = 0;
-Unit _startCeilHeight = 0;
-Unit _camResYLimit = 0;
-Unit _middleRow = 0;
-ArrayFunction _floorFunction = 0;
-ArrayFunction _ceilFunction = 0;
-uint8_t _computeTextureCoords = 0;
-Unit _fHorizontalDepthStart = 0;
-Unit _cHorizontalDepthStart = 0;
-int16_t _cameraHeightScreen = 0;
-ArrayFunction _rollFunction = 0; // says door rolling
-
 /**
   Helper function that determines intersection with both ceiling and floor.
 */
@@ -990,7 +996,7 @@ void _columnFunctionSimple(HitResult *hits, uint16_t hitCount, uint16_t x,
 
     if (_rollFunction != 0)
     {
-      Unit doorRoll = _rollFunction(hit.square.x,hit.square.y);
+      Unit doorRoll = hit.doorRoll;
 
       int8_t unrolled = doorRoll >= 0 ?
         doorRoll > hit.textureCoord :