// $Id: f16spec.cpp 1282 2006-06-09 09:46:49Z alex $ /* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE ================================XARAHEADERSTART=========================== Xara LX, a vector drawing and manipulation program. Copyright (C) 1993-2006 Xara Group Ltd. Copyright on certain contributions may be held in joint with their respective authors. See AUTHORS file for details. LICENSE TO USE AND MODIFY SOFTWARE ---------------------------------- This file is part of Xara LX. Xara LX is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. Xara LX and its component source files are distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Xara LX (see the file GPL in the root directory of the distribution); if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA ADDITIONAL RIGHTS ----------------- Conditional upon your continuing compliance with the GNU General Public License described above, Xara Group Ltd grants to you certain additional rights. The additional rights are to use, modify, and distribute the software together with the wxWidgets library, the wxXtra library, and the "CDraw" library and any other such library that any version of Xara LX relased by Xara Group Ltd requires in order to compile and execute, including the static linking of that library to XaraLX. In the case of the "CDraw" library, you may satisfy obligation under the GNU General Public License to provide source code by providing a binary copy of the library concerned and a copy of the license accompanying it. Nothing in this section restricts any of the rights you have under the GNU General Public License. SCOPE OF LICENSE ---------------- This license applies to this program (XaraLX) and its constituent source files only, and does not necessarily apply to other Xara products which may in part share the same code base, and are subject to their own licensing terms. This license does not apply to files in the wxXtra directory, which are built into a separate library, and are subject to the wxWindows license contained within that directory in the file "WXXTRA-LICENSE". This license does not apply to the binary libraries (if any) within the "libs" directory, which are subject to a separate license contained within that directory in the file "LIBS-LICENSE". ARRANGEMENTS FOR CONTRIBUTION OF MODIFICATIONS ---------------------------------------------- Subject to the terms of the GNU Public License (see above), you are free to do whatever you like with your modifications. However, you may (at your option) wish contribute them to Xara's source tree. You can find details of how to do this at: http://www.xaraxtreme.org/developers/ Prior to contributing your modifications, you will need to complete our contributor agreement. This can be found at: http://www.xaraxtreme.org/developers/contribute/ Please note that Xara will not accept modifications which modify any of the text between the start and end of this header (marked XARAHEADERSTART and XARAHEADEREND). MARKS ----- Xara, Xara LX, Xara X, Xara X/Xtreme, Xara Xtreme, the Xtreme and Xara designs are registered or unregistered trademarks, design-marks, and/or service marks of Xara Group Ltd. All rights in these marks are reserved. Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK. http://www.xara.com/ =================================XARAHEADEREND============================ */ // fixed16 code that will probably need changing between platforms // (portable code can be found in fixed16.cpp). This is the Windows version #include "camtypes.h" #include "f16spec.h" //#include "source.h" #include //#include "errors.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "andy.h" DECLARE_SOURCE("$Revision: 1282 $"); #define TORADIANS(x) ((x)/180.0*PI) /******************************************************************************************** > BOOL MathCoprocInstalled; Author: Mario_Shamtani (Xara Group Ltd) Created: 11/6/93 SeeAlso: InitMaths() Purpose: Flag used to determine if there is a maths coprocessor present. Its default setting is FALSE i.e. there is no coprocessor installed. This is mainly used to hint GDraw how to do things most efficiently. Errors: None. ********************************************************************************************/ static BOOL MathCoprocInstalled = FALSE; // set this to 1 for the test. Disabled because we have yet to get a Pentium to try it on #define PENTIUM_TEST 0 #if PENTIUM_TEST // Pentium FDIV bug test code // // Here is a simple test that will reproduce the bug, if present; // if this gives "256.000000" as result, your system is affected; on a 486, // this gives "0.000000". The fn returns true if the FPU is OK // (Note we have never seen this check go off as we have no Pentium machines) static volatile double IFPBFFOd0=0; static volatile double * IsFloatingPointBugFreeFoolOptimiser(volatile double * pdbl) { if (pdbl) pdbl++; IFPBFFOd0 = *(--pdbl); return (pdbl); // This function just returns its own value. } // (This code obtained by Alex from somewhere on the net) static BOOL IsFloatingPointBugFree() { volatile double *w,*x,*y,*z; volatile double wd,xd,yd,zd; w=&wd; x=&xd; y=&yd; z=&zd; w=IsFloatingPointBugFreeFoolOptimiser(w); x=IsFloatingPointBugFreeFoolOptimiser(x); y=IsFloatingPointBugFreeFoolOptimiser(y); z=IsFloatingPointBugFreeFoolOptimiser(z); (*x) = 4195835.0; (*y) = 3145727.0; (*z) = ((*x)/(*y)); w=IsFloatingPointBugFreeFoolOptimiser(w); x=IsFloatingPointBugFreeFoolOptimiser(x); y=IsFloatingPointBugFreeFoolOptimiser(y); z=IsFloatingPointBugFreeFoolOptimiser(z); (*z) = (*z) * (*y); w=IsFloatingPointBugFreeFoolOptimiser(w); x=IsFloatingPointBugFreeFoolOptimiser(x); y=IsFloatingPointBugFreeFoolOptimiser(y); z=IsFloatingPointBugFreeFoolOptimiser(z); (*w) = (*x) - (*z); w=IsFloatingPointBugFreeFoolOptimiser(w); x=IsFloatingPointBugFreeFoolOptimiser(x); y=IsFloatingPointBugFreeFoolOptimiser(y); z=IsFloatingPointBugFreeFoolOptimiser(z); return ((*w)<128.0); } #endif // PENTIUM_TEST /******************************************************************************************** > BOOL IsMathCoprocInstalled() Author: Andy_Pennell (Xara Group Ltd) Created: 19/1/95 Returns: TRUE if the hardware supports a real FPU, FALSE if emulated. Purpose: Gives a hint to those that need to know things about FPU performance. Errors: None. ********************************************************************************************/ BOOL IsMathCoprocInstalled() { #if defined(__WXMSW__) // the theoretically proper way to detect an FPU is to delve into the reigstry thus: // NT entry lives at HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\FloatingPointProcessor\0 // W95 entry lives at HKEY_LOCAL_MACHINE\Enum\Root\*PNP0C01\0000NDP (M7 liable to change) // W32s is only available by thunking to WinFlags() (ug). // Instead, we use a tiny bit of .asm, as suggested by Mr-Asm himself, Gavin WORD RegCR0; _asm { smsw RegCR0 // bit 2 of CR0 is the EM bit, set for emulation } return (RegCR0 & 4) ? FALSE : TRUE; #else return TRUE; #endif } /******************************************************************************************** > BOOL InitMaths() Author: Mario_Shamtani (Xara Group Ltd) Created: 26/4/93 Inputs: None. Outputs: None Returns: A Boolean if initialisation was ok. Purpose: Initialises the maths class. Windows version tests for maths coprocessor. Also sets up maths exception vectors. Errors: None. ********************************************************************************************/ BOOL InitMaths() { MathCoprocInstalled = IsMathCoprocInstalled(); #if PENTIUM_TEST // now check for faulty Pentium if ( !IsFloatingPointBugFree() ) { Error::SetError( _R(IDE_BAD_PENTIUM) ); InformError(); } #endif return TRUE; } /******************************************************************************************** > FIXED16& FIXED16::Sin() Author: Mario_Shamtani (Xara Group Ltd) Created: 14/5/93 SeeAlso: Fixed16Sin() Inputs: None. Outputs: None Returns: A reference to an FIXED16 with result of sin. Input argument must be in DEGREES not radians. Purpose: Performs sine on a FIXED16. Errors: None. ********************************************************************************************/ fixed16& fixed16::Sin() { #ifndef WIN32 if (MathCoprocInstalled) //Is MathCoprocessor installed *this = Fixed16Sin(*this); else #endif *this = sin(TORADIANS(this->MakeDouble())); ERROR3("Alex doubts whether this routine works"); return *this; } /******************************************************************************************** > FIXED16& FIXED16::Cos() Author: Mario_Shamtani (Xara Group Ltd) Created: 14/5/93 SeeAlso: Fixed16Cos() Inputs: None. Outputs: None Returns: A reference to an FIXED16 with result of Cos. Input argument must be in DEGREES not radians. Purpose: Performs Cos on a FIXED16. Errors: None. ********************************************************************************************/ fixed16& fixed16::Cos() { #ifndef WIN32 if (MathCoprocInstalled) //Is MathCoprocessor installed *this = Fixed16Cos(*this); else #endif *this = cos(TORADIANS(this->MakeDouble())); ERROR3("Alex doubts whether this routine works"); return *this; }