From 4fe107c991da7e63158c8d49f146103f3ed33db5 Mon Sep 17 00:00:00 2001
From: FunkyFr3sh <cc.red.alert.1@googlemail.com>
Date: Tue, 25 Sep 2018 01:56:15 +0200
Subject: [PATCH] adjust alignment in case width is not divisible 4 - fixes
 resolutions such as 1366*768

---
 src/render.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/render.c b/src/render.c
index 5e94d0a..28aec7a 100644
--- a/src/render.c
+++ b/src/render.c
@@ -49,6 +49,7 @@ static GLuint FrameBufferId;
 static GLuint FrameBufferTexId;
 static GLuint ScaleVBOs[3], ScaleVAO;
 static BOOL UseOpenGL;
+static BOOL AdjustAlignment;
 
 static HGLRC CreateContext(HDC hdc);
 static void SetMaxFPS(int baseMaxFPS);
@@ -199,6 +200,8 @@ static void CreateTextures(int width, int height)
 
     SurfaceTex = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, SurfaceTexWidth * SurfaceTexHeight * sizeof(int));
 
+    AdjustAlignment = (width % 4) != 0;
+
     ScaleW = (float)width / SurfaceTexWidth;
     ScaleH = (float)height / SurfaceTexHeight;
 
@@ -644,6 +647,9 @@ static void Render()
 
                     glBindTexture(GL_TEXTURE_2D, SurfaceTexIds[texIndex]);
 
+                    if (AdjustAlignment)
+                        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
                     glTexSubImage2D(
                         GL_TEXTURE_2D, 
                         0, 
@@ -654,6 +660,9 @@ static void Render()
                         SurfaceFormat, 
                         GL_UNSIGNED_BYTE,
                         ddraw->primary->surface);
+
+                    if (AdjustAlignment)
+                        glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
                 }
             }
             else