From 499fefec07c21639e9922708376310ba8cff6fa3 Mon Sep 17 00:00:00 2001
From: Randy Heit <rheit@zdoom.fake>
Date: Sun, 27 Jan 2008 05:23:10 +0000
Subject: [PATCH] - Added preloading of fonts to reduce the chance that
 characters from a single   font will require more than one hardware texture
 to display.

SVN r717 (trunk)
---
 docs/rh-log.txt |  2 ++
 src/v_font.cpp  | 44 ++++++++++++++++++++++++++++++++++++++++++++
 src/v_font.h    |  2 ++
 src/v_video.cpp |  4 ++++
 4 files changed, 52 insertions(+)

diff --git a/docs/rh-log.txt b/docs/rh-log.txt
index 559c5be2b..772f5688d 100644
--- a/docs/rh-log.txt
+++ b/docs/rh-log.txt
@@ -1,4 +1,6 @@
 January 26, 2008
+- Added preloading of fonts to reduce the chance that characters from a single
+  font will require more than one hardware texture to display.
 - Fixed: P_RailAttack() crashed if you didn't specify a puff for a rail.
 - Decided that allowing arbitrary alpha values for color remaps isn't so hot.
   Changed it back the way it was.
diff --git a/src/v_font.cpp b/src/v_font.cpp
index 79433d5fe..34a83f1c3 100644
--- a/src/v_font.cpp
+++ b/src/v_font.cpp
@@ -741,6 +741,50 @@ int FFont::GetCharWidth (int code) const
 	return Chars[code - FirstChar].Pic->GetScaledWidth();
 }
 
+//==========================================================================
+//
+// FFont :: Preload
+//
+// Loads most of the 7-bit ASCII characters. In the case of D3DFB, this
+// means all the characters of a font have a better chance of being packed
+// into the same hardware texture.
+//
+//==========================================================================
+
+void FFont::Preload() const
+{
+	// First and last char are the same? Wait until it's actually needed
+	// since nothing is gained by preloading now.
+	if (FirstChar == LastChar)
+	{
+		return;
+	}
+	for (int i = MAX(FirstChar, 0x21); i < MIN(LastChar, 0x7e); ++i)
+	{
+		int foo;
+		FTexture *pic = GetChar(i, &foo);
+		if (pic != NULL)
+		{
+			pic->GetNative(false);
+		}
+	}
+}
+
+//==========================================================================
+//
+// FFont :: StaticPreloadFonts
+//
+// Preloads all the defined fonts.
+//
+//==========================================================================
+
+void FFont::StaticPreloadFonts()
+{
+	for (FFont *font = FirstFont; font != NULL; font = font->Next)
+	{
+		font->Preload();
+	}
+}
 
 //==========================================================================
 //
diff --git a/src/v_font.h b/src/v_font.h
index c48561573..d71ef785e 100644
--- a/src/v_font.h
+++ b/src/v_font.h
@@ -91,8 +91,10 @@ public:
 	int GetSpaceWidth () const { return SpaceWidth; }
 	int GetHeight () const { return FontHeight; }
 	int GetDefaultKerning () const { return GlobalKerning; }
+	void Preload() const;
 
 	static FFont *FindFont (const char *fontname);
+	static void StaticPreloadFonts();
 
 	// Return width of string in pixels (unscaled)
 	int StringWidth (const BYTE *str) const;
diff --git a/src/v_video.cpp b/src/v_video.cpp
index f3ddc79ea..ebb3282eb 100644
--- a/src/v_video.cpp
+++ b/src/v_video.cpp
@@ -1386,6 +1386,10 @@ bool V_DoModeSetup (int width, int height, int bits)
 	screen->SetFont (SmallFont);
 	screen->SetGamma (Gamma);
 
+	// Load fonts now so they can be packed into textures straight away,
+	// if D3DFB is being used for the display.
+	FFont::StaticPreloadFonts();
+
 	{
 		int ratio;
 		int cwidth;