From 7a23c39b9e4132640b32b15bb7c43f22a7188bab Mon Sep 17 00:00:00 2001
From: LittlePlanetCD <littleplanetcd1993@gmail.com>
Date: Thu, 21 Mar 2024 23:05:22 -0500
Subject: [PATCH] revise parallax fix to match original engine fr

---
 RSDKv3/Drawing.cpp |  4 +++-
 RSDKv3/Scene.cpp   | 11 ++---------
 RSDKv3/Scene.hpp   |  1 -
 3 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/RSDKv3/Drawing.cpp b/RSDKv3/Drawing.cpp
index 90ff7adf..f088a730 100644
--- a/RSDKv3/Drawing.cpp
+++ b/RSDKv3/Drawing.cpp
@@ -2108,6 +2108,7 @@ void DrawHLineScrollLayer(int layerID)
                 int fullLayerwidth = layerwidth << 7;
                 for (int i = 0; i < hParallax.entryCount; ++i) {
                     hParallax.linePos[i] = xScrollOffset * hParallax.parallaxFactor[i] >> 8;
+                    hParallax.scrollPos[i] += hParallax.scrollSpeed[i];
                     if (hParallax.scrollPos[i] > fullLayerwidth << 16)
                         hParallax.scrollPos[i] -= fullLayerwidth << 16;
                     if (hParallax.scrollPos[i] < 0)
@@ -2648,6 +2649,7 @@ void DrawHLineScrollLayer(int layerID)
                 layerWidth = layerWidth << 7;
                 for (int i = 0; i < hParallax.entryCount; i++) {
                     hParallax.linePos[i]   = hParallax.parallaxFactor[i] * xScrollOffset >> 8;
+                    hParallax.scrollPos[i] = hParallax.scrollPos[i] + hParallax.scrollSpeed[i];
                     if (hParallax.scrollPos[i] > layerWidth << 16) {
                         hParallax.scrollPos[i] = hParallax.scrollPos[i] - (layerWidth << 16);
                     }
@@ -3458,7 +3460,7 @@ void DrawVLineScrollLayer(int layerID)
                 int fullLayerheight = layerheight << 7;
                 for (int i = 0; i < vParallax.entryCount; ++i) {
                     vParallax.linePos[i] = yScrollOffset * vParallax.parallaxFactor[i] >> 8;
-
+                    vParallax.scrollPos[i] += vParallax.scrollSpeed[i];
                     vParallax.scrollPos[i] += vParallax.scrollPos[i] << 16;
                     if (vParallax.scrollPos[i] > fullLayerheight << 16)
                         vParallax.scrollPos[i] -= fullLayerheight << 16;
diff --git a/RSDKv3/Scene.cpp b/RSDKv3/Scene.cpp
index 77676abc..9435e1a4 100644
--- a/RSDKv3/Scene.cpp
+++ b/RSDKv3/Scene.cpp
@@ -268,7 +268,6 @@ void ProcessStage(void)
 
             // Update
             ProcessObjects();
-            ProcessParallaxAutoScroll();
 
             if (cameraTarget > -1) {
                 if (cameraEnabled == 1) {
@@ -339,12 +338,6 @@ void ProcessStage(void)
     Engine.frameCount++;
 }
 
-void ProcessParallaxAutoScroll()
-{
-    for (int i = 0; i < hParallax.entryCount; ++i) hParallax.scrollPos[i] += hParallax.scrollSpeed[i];
-    for (int i = 0; i < vParallax.entryCount; ++i) vParallax.scrollPos[i] += vParallax.scrollSpeed[i];
-}
-
 void LoadStageFiles(void)
 {
     StopAllSfx();
@@ -755,7 +748,7 @@ void LoadStageBackground()
             FileRead(&fileBuffer, 1);
             hParallax.parallaxFactor[i] = fileBuffer << 8;
             FileRead(&fileBuffer, 1);
-            hParallax.parallaxFactor[i] |= fileBuffer;
+            hParallax.parallaxFactor[i] += fileBuffer;
 
             FileRead(&fileBuffer, 1);
             hParallax.scrollSpeed[i] = fileBuffer << 10;
@@ -770,7 +763,7 @@ void LoadStageBackground()
             FileRead(&fileBuffer, 1);
             vParallax.parallaxFactor[i] = fileBuffer << 8;
             FileRead(&fileBuffer, 1);
-            vParallax.parallaxFactor[i] |= fileBuffer;
+            vParallax.parallaxFactor[i] += fileBuffer;
 
             FileRead(&fileBuffer, 1);
             vParallax.scrollSpeed[i] = fileBuffer << 10;
diff --git a/RSDKv3/Scene.hpp b/RSDKv3/Scene.hpp
index ecb35bb9..ca675d32 100644
--- a/RSDKv3/Scene.hpp
+++ b/RSDKv3/Scene.hpp
@@ -201,7 +201,6 @@ extern bool drawStageGFXHQ;
 
 void InitFirstStage();
 void ProcessStage();
-void ProcessParallaxAutoScroll();
 
 void ResetBackgroundSettings();
 inline void ResetCurrentStageFolder() { strcpy(currentStageFolder, ""); }