f16spec.cpp File Reference

(r1785/r1282)

#include "camtypes.h"
#include "f16spec.h"
#include <math.h>

Go to the source code of this file.

Defines
#define	TORADIANS(x)   ((x)/180.0*PI)
#define	PENTIUM_TEST   0
Functions
	DECLARE_SOURCE ("$Revision: 1282 $")
BOOL	IsMathCoprocInstalled ()
	Gives a hint to those that need to know things about FPU performance.
BOOL	InitMaths ()
	Initialises the maths class. Windows version tests for maths coprocessor. Also sets up maths exception vectors.
Variables
static BOOL	MathCoprocInstalled = FALSE
	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.

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Define Documentation

#define PENTIUM_TEST   0

Definition at line 134 of file f16spec.cpp.

#define TORADIANS (  x   )     ((x)/180.0*PI)

Definition at line 113 of file f16spec.cpp.

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Function Documentation

DECLARE_SOURCE (  "$Revision: 1282 $"   )

BOOL InitMaths (   )

Initialises the maths class. Windows version tests for maths coprocessor. Also sets up maths exception vectors. Author: Mario_Shamtani (Xara Group Ltd) <camelotdev@xara.com> Date: 26/4/93 Parameters: None.  [INPUTS] None  [OUTPUTS] Returns: A Boolean if initialisation was ok. Errors: None. Definition at line 249 of file f16spec.cpp. { MathCoprocInstalled = IsMathCoprocInstalled(); #if PENTIUM_TEST // now check for faulty Pentium if ( !IsFloatingPointBugFree() ) { Error::SetError( _R(IDE_BAD_PENTIUM) ); InformError(); } #endif return TRUE; }

BOOL IsMathCoprocInstalled (   )

Gives a hint to those that need to know things about FPU performance. Author: Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com> Date: 19/1/95 Returns: TRUE if the hardware supports a real FPU, FALSE if emulated. Errors: None. Definition at line 213 of file f16spec.cpp. { #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 }

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Variable Documentation

BOOL MathCoprocInstalled = FALSE [static]

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. Author: Mario_Shamtani (Xara Group Ltd) <camelotdev@xara.com> Date: 11/6/93 See also: InitMaths() Returns: Errors: None. Definition at line 131 of file f16spec.cpp.

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