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/Pas/gl.pas       |  4 ++--
 Game/Code/lib/JEDI-SDL/OpenGL/Pas/opengl12.pas | 28 ++++++++++----------------
 2 files changed, 13 insertions(+), 19 deletions(-)

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

diff --git a/Game/Code/lib/JEDI-SDL/OpenGL/Pas/gl.pas b/Game/Code/lib/JEDI-SDL/OpenGL/Pas/gl.pas
index d2bdcf8b..5c5ec0da 100644
--- a/Game/Code/lib/JEDI-SDL/OpenGL/Pas/gl.pas
+++ b/Game/Code/lib/JEDI-SDL/OpenGL/Pas/gl.pas
@@ -2287,9 +2287,9 @@ begin
 end;
 
 initialization
-  {$ifdef x86}
+  {$IF Defined(CPU386) or Defined(CPUI386) or Defined(CPUX86_64)}
   Set8087CW($133F);
-  {$endif x86}
+  {$IFEND}
 
   LoadOpenGL( GLLibName );
 
diff --git a/Game/Code/lib/JEDI-SDL/OpenGL/Pas/opengl12.pas b/Game/Code/lib/JEDI-SDL/OpenGL/Pas/opengl12.pas
index f75b6888..dd27bfbc 100644
--- a/Game/Code/lib/JEDI-SDL/OpenGL/Pas/opengl12.pas
+++ b/Game/Code/lib/JEDI-SDL/OpenGL/Pas/opengl12.pas
@@ -7125,16 +7125,15 @@ end;
 
 //----------------------------------------------------------------------------------------------------------------------
 
-{$ifndef VER140}
+// RaiseLastOSError did not exist in Delphi 5
+{$ifdef VER130}
 
 procedure RaiseLastOSError;
 begin
-  {$ifndef FPC}
   RaiseLastWin32Error;
-  {$endif}
 end;
 
-{$endif VER140}
+{$endif}
 
 //----------------------------------------------------------------------------------------------------------------------
 
@@ -9947,22 +9946,17 @@ begin
   Result := GLHandle <> INVALID_MODULEHANDLE; 
 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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