From 1a16f5c72896d243cac33147e8ca28079b882ecf Mon Sep 17 00:00:00 2001
From: tobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c>
Date: Thu, 20 Mar 2008 00:54:21 +0000
Subject: - Delphi (in contrast to C/C++) handles floating-point
 multiplications with NaN or divisions by 0.0 as floating-point exceptions
 (FPE). This is a problem with some libraries which expect that e.g. "NaN *
 3.0" is NaN or "4.0 / 0" is INFINITY. - The (strange) default behavior can be
 changed by setting the control word of the FPU. This is done by assigning
 $133F to this register via Set8087CW() in delphi. In FPC it was not available
 for a long time but now it is. OpenGL12.pas contained an own version of
 Set8087CW() which was totally wrong because the important asm-directives
 (fclex and fldcw) were missing so it was not of any use. Hence it was removed
 from the unit so it does not hide the correct FPC version anymore. - This
 should fix some EDivByZero exceptions in floating-point expressions (as with
 projectM).

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/trunk@962 b956fd51-792f-4845-bead-9b4dfca2ff2c
---
 Game/Code/lib/JEDI-SDL/OpenGL-Set8087CW.patch | 70 +++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 Game/Code/lib/JEDI-SDL/OpenGL-Set8087CW.patch

(limited to 'Game/Code/lib/JEDI-SDL/OpenGL-Set8087CW.patch')

diff --git a/Game/Code/lib/JEDI-SDL/OpenGL-Set8087CW.patch b/Game/Code/lib/JEDI-SDL/OpenGL-Set8087CW.patch
new file mode 100644
index 00000000..aeebeee5
--- /dev/null
+++ b/Game/Code/lib/JEDI-SDL/OpenGL-Set8087CW.patch
@@ -0,0 +1,70 @@
+Index: OpenGL/Pas/gl.pas
+===================================================================
+--- OpenGL/Pas/gl.pas	(revision 961)
++++ OpenGL/Pas/gl.pas	(working copy)
+@@ -2287,9 +2287,9 @@
+ end;
+ 
+ initialization
+-  {$ifdef x86}
++  {$IF Defined(CPU386) or Defined(CPUI386) or Defined(CPUX86_64)}
+   Set8087CW($133F);
+-  {$endif x86}
++  {$IFEND}
+ 
+   LoadOpenGL( GLLibName );
+ 
+Index: OpenGL/Pas/opengl12.pas
+===================================================================
+--- OpenGL/Pas/opengl12.pas	(revision 961)
++++ OpenGL/Pas/opengl12.pas	(working copy)
+@@ -7125,16 +7125,15 @@
+ 
+ //----------------------------------------------------------------------------------------------------------------------
+ 
+-{$ifndef VER140}
++// RaiseLastOSError did not exist in Delphi 5
++{$ifdef VER130}
+ 
+ procedure RaiseLastOSError;
+ begin
+-  {$ifndef FPC}
+   RaiseLastWin32Error;
+-  {$endif}
+ end;
+ 
+-{$endif VER140}
++{$endif}
+ 
+ //----------------------------------------------------------------------------------------------------------------------
+ 
+@@ -9948,21 +9947,16 @@
+ end; 
+ 
+ //----------------------------------------------------------------------------------------------------------------------
+-{$ifdef FPC}
+-const Default8087CW: Word = $1332;
+ 
+-{$ASMMODE INTEL}
+-procedure Set8087CW(NewCW: Word); Assembler;
+-asm
+-  MOV Default8087CW, AX
+-end;
+-{$endif}
+-
+-//----------------------------------------------------------------------------------------------------------------------
+-
+ initialization
+-  ContextList := TThreadList.Create; 
+-  Set8087CW($133F); 
++  ContextList := TThreadList.Create;
++  {$IF Defined(CPU386) or Defined(CPUI386) or Defined(CPUX86_64)}
++  // FPC has its own implementation of Set8087CW now. The wrongly
++  // coded (the important asm-directives were missing so it was not of any use!!!)
++  // implementation was removed from this unit so it does not hide the correct FPC version anymore.
++  // This should fix some EDivByZero exceptions in floating-point expressions.
++  Set8087CW($133F);
++  {$IFEND}
+ finalization
+   CloseOpenGL; 
+   ContextList.Free; 
-- 
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