diff --git a/lib/ivis_common/piepalette.h b/lib/ivis_common/piepalette.h
index 8ae0da6f8..091f5687d 100644
--- a/lib/ivis_common/piepalette.h
+++ b/lib/ivis_common/piepalette.h
@@ -66,6 +66,7 @@
 #define WZCOL_MENU_SHADOW	psPalette[41]
 #define WZCOL_DBLUE					psPalette[42]
 #define WZCOL_LBLUE					psPalette[43]
+
 #define WZCOL_MAX			44
 
 //*************************************************************************
diff --git a/lib/ivis_opengl/piepalette.c b/lib/ivis_opengl/piepalette.c
index a2b149630..227fa0631 100644
--- a/lib/ivis_opengl/piepalette.c
+++ b/lib/ivis_opengl/piepalette.c
@@ -95,8 +95,8 @@ void pal_Init(void)
 	WZCOL_MAP_PREVIEW_AIPLAYER = pal_Colour(0, 0x7f, 0);
 	WZCOL_GREY = pal_Colour(0x55, 0x55, 0x55);
 	WZCOL_MENU_SHADOW = WZCOL_BLACK;
-	WZCOL_DBLUE =pal_Colour(0x0f,0x08,0x56);
-	WZCOL_LBLUE =pal_Colour(0x1c,0x9f,0xfb);
+	WZCOL_DBLUE = pal_Colour(0x0f,0x08,0x56);
+	WZCOL_LBLUE = pal_Colour(0x1c,0x9f,0xfb);
 }
 
 void pal_ShutDown(void)
diff --git a/lib/ivis_opengl/screen.c b/lib/ivis_opengl/screen.c
index ec98ed7ba..8550371c2 100644
--- a/lib/ivis_opengl/screen.c
+++ b/lib/ivis_opengl/screen.c
@@ -61,7 +61,7 @@ static GLuint		backDropTexture = ~0;
 GLuint fbo;					// Our handle to the FBO
 GLuint FBOtexture;			// The texture we are going to use
 GLuint FBOdepthbuffer;		// Our handle to the depth render buffer
-static BOOL FBOinit = false;			
+static BOOL FBOinit = false;
 
 /* Initialise the double buffered display */
 BOOL screenInitialise(
@@ -390,26 +390,24 @@ void screenDumpToDisk(const char* path) {
 	if (screendump_num != 0)
 		screendump_required = true;
 }
-// checkGLErrors( char *label)
-// 
-// if a openGL error has occured, we query the error code, and see what it was.
+
+/**
+ * Checks if an OpenGL error has occurred.
+ * \param label Label to print when an OpenGL occurred.
+ */
 void checkGLErrors(const char *label)
 {
-    GLenum errCode;
-    const GLubyte *errStr;
+	const GLenum errCode = glGetError();
 
-    if ((errCode = glGetError()) != GL_NO_ERROR)
-	{
-		errStr = gluErrorString(errCode);
-		debug(LOG_ERROR,"OpenGL ERROR in %s: ",label);
-		debug(LOG_ERROR,"%s, %d(0x%0x)",(char*)errStr,errCode,errCode);
-	}
+	if (errCode == GL_NO_ERROR)
+		return;
+
+	debug(LOG_ERROR, "OpenGL ERROR in %s: %s, (0x%0x)", label, gluErrorString(errCode), errCode);
 }
-// Init_FBO( int width, int height )
-//  FBO create routine
+
 BOOL Init_FBO( int width, int height )
 {
-GLenum status;	
+	GLenum status;
 	// check to make sure user has FBO available, and we didn't create a FBO before.
 	if(GLEE_EXT_framebuffer_object  && !FBOinit)
 	{
@@ -433,7 +431,7 @@ GLenum status;
 
 		// attach that texture to the color
 		glFramebufferTexture2DEXT (GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
-		GL_TEXTURE_2D, FBOtexture, 0);
+		                           GL_TEXTURE_2D, FBOtexture, 0);
 		glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 0); // unbind FBO
 
 		// make sure everything went OK
@@ -488,7 +486,7 @@ GLenum status;
 	return true;
 
 }
-// Delete_FBO()
+
 void Delete_FBO(void)
 {
 	if(FBOinit)
diff --git a/lib/ivis_opengl/screen.h b/lib/ivis_opengl/screen.h
index 23afb992f..77fa7c3df 100644
--- a/lib/ivis_opengl/screen.h
+++ b/lib/ivis_opengl/screen.h
@@ -59,6 +59,7 @@ extern void	screenToggleMode(void);
 extern int wz_texture_compression;
 
 extern void screenDoDumpToDiskIfRequired(void);
+
 extern BOOL Init_FBO( int width, int height );
 extern void Delete_FBO(void);
 extern void checkGLErrors(const char *label);  // reports what the openGL error was
diff --git a/src/game.c b/src/game.c
index bbdfc3dda..d451fb5a4 100644
--- a/src/game.c
+++ b/src/game.c
@@ -11816,20 +11816,17 @@ static BOOL getNameFromComp(UDWORD compType, char *pDest, UDWORD compIndex)
 }
 // -----------------------------------------------------------------------------------------
 // END
-//======================================================
-//BOOL plotStructurePreview16(
-// char *backDropSprite,			// the premade map texture
-// UBYTE scale,						// scale of the map texture
-// UDWORD offX,						// X offset for map
-// UDWORD offY,						// Y offset for map
-// Vector2i playeridpos[])			// holds the position on map that player's HQ is located
-//
-// adds clancolors for the map preview texture.
-// What basically happens in this routine is we read the map, and then for
-// every structure on said map, we either color it via clan colors (which
-// are the same as the radar colors), and it plots its pixel on the bitmap.
-// Also added position number of starting location (which is determined by
-// the map maker(!)) This info is needed so we can blit players location. 
+
+/**
+ * \param[out] backDropSprite The premade map texture.
+ * \param scale               Scale of the map texture.
+ * \param offX,offY           X and Y offset for map
+ * \param[out] playeridpos    Will contain the position on the map where the player's HQ are located.
+ *
+ * Reads the current map and colours the map preview for any structures
+ * present. Additionally we load the player's HQ location into playeridpos so
+ * we know the player's starting location.
+ */
 BOOL plotStructurePreview16(char *backDropSprite, UBYTE scale, UDWORD offX, UDWORD offY,Vector2i playeridpos[])
 {
 	SAVE_STRUCTURE				sSave;  // close eyes now.
@@ -11937,6 +11934,7 @@ BOOL plotStructurePreview16(char *backDropSprite, UBYTE scale, UDWORD offX, UDWO
 			endian_udword(&psSaveStructure2->player);
 			endian_udword(&psSaveStructure2->burnStart);
 			endian_udword(&psSaveStructure2->burnDamage);
+
 			// we are specifically looking for the HQ, and it seems this is the only way to
 			// find it via parsing map.
 			// We store the coordinates of the structure, into a array for as many players as are on the map.
@@ -12244,7 +12242,7 @@ BOOL plotStructurePreview16(char *backDropSprite, UBYTE scale, UDWORD offX, UDWO
 			color.rgba = clanColours[playerid].rgba;
 			// kludge to fix black, so you can see it on some maps.
 			if ( playerid == 3 )	// in this case 3 = pallete entry for black.
-			{	
+			{
 				color = WZCOL_GREY;
 			}
 		}
@@ -12252,9 +12250,10 @@ BOOL plotStructurePreview16(char *backDropSprite, UBYTE scale, UDWORD offX, UDWO
 		{	// Use a dark green color for the AI
 			color = WZCOL_MAP_PREVIEW_AIPLAYER ;
 		}
+
 		if(HQ)
 		{	// This shows where the HQ is on the map in a special color.
-			// We could do the same for anything else (oil/whatever) also.  
+			// We could do the same for anything else (oil/whatever) also.
 			// Possible future enhancement?
 			color.byte.b=0xff;
 			color.byte.g=0;
@@ -12266,14 +12265,13 @@ BOOL plotStructurePreview16(char *backDropSprite, UBYTE scale, UDWORD offX, UDWO
 		{
 			for(y = (yy*scale);y< (yy*scale)+scale ;y++)
 			{
-				backDropSprite[3 * (((offY + y) * BACKDROP_HACK_WIDTH) + x + offX)] = color.byte.r;	 
+				backDropSprite[3 * (((offY + y) * BACKDROP_HACK_WIDTH) + x + offX)] = color.byte.r;
 				backDropSprite[3 * (((offY + y) * BACKDROP_HACK_WIDTH) + x + offX) + 1] = color.byte.g;
 				backDropSprite[3 * (((offY + y) * BACKDROP_HACK_WIDTH) + x + offX) + 2] = color.byte.b;
 			}
-			
 		}
-		
 	}
+
 	// NOTE: would do fallback if FBO is not available here.
-return true;
+	return true;
 }
diff --git a/src/multiint.c b/src/multiint.c
index 68ff1eb0a..44d2645c8 100644
--- a/src/multiint.c
+++ b/src/multiint.c
@@ -187,13 +187,13 @@ void loadMapPreview(void)
 	UDWORD			fileSize;
 	char			*pFileData = NULL;
 	LEVEL_DATASET	*psLevel = NULL;
+
 	UDWORD			i, j, x, y, height, offX2, offY2;
 	UBYTE			scale,col;
 	MAPTILE			*psTile,*WTile;
 	UDWORD oursize;
 	Vector2i playerpos[MAX_PLAYERS];	// Will hold player positions
 	char  *ptr = NULL, *imageData = NULL, *fboData = NULL;
-//=============================
 
 	if(psMapTiles)
 	{
@@ -386,6 +386,7 @@ void loadMapPreview(void)
 
 	free(fboData);
 	free(imageData);
+
 	hideTime = gameTime;
 	mapShutdown();
 	Delete_FBO();