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- Voxelspace-Problems 18.8.97 by Sam Jordan
- ---------------------------------------------
-
- The voxelspace demo is a highly optimized demonstration of the
- PowerPC processor and of the fast graphics display, too. There
- were a lot of new techniques tested which could become established
- in the future. Therefore, at this time, problems can occur dependant
- of the hardware and software configuration. The voxelspace demo
- now offers some options which can be used to bypass such problems.
-
- The most important parameters which can cause problems:
-
- 'm' : This parameter enables a 'MMU-hack' for the 68K processor
- (68040/68060 only). This option allows the access to the
- 68K-MMU in a completely non-system-compliant way and can
- therefore cause many problems. Until now there were reported
- complete hang-ups of the systems and problems with the CSPPC-
- SCSI controller. This parameter has absolutely
- no influence on the performance of the PowerPC, so it can
- be omitted, if only the PPC performance plays a role.
-
- 'g' : This option enables the direct graphics board access. In this
- mode the frame is created directly in the frame buffer
- (TURBOGFX mode).
- By default, the demo tries to access the bitmap as system-
- compliant as possible, so the bitmap is locked and unlocked
- using the functions of the 'cybergraphics.library'. Nevertheless
- problems can occur in this mode, especially on different
- graphics boards.
-
- 'nl' : This parameter only plays a role when 'g' is enabled and 'mo'
- is disabled. It disables the lockint/unlocking of the bitmap
- in TURBOGFX-mode. If the option 'g' causes problems, the
- combination 'g nl' should be tried out.
-
- 'mo' : This parameter only plays a role when 'g' is enable. The address
- of the bitmap is then evaluated using an alternative method.
- The standard method was broken on some older versions of
- CyberGFX, so if problems occur, the combination 'g mo' should
- be tried out.
-
- 'c' : This parameter only plays a role, when 'g' is disabled. This
- enables the standard method of graphics board access, but
- additionally, 'Multibuffering' ist used. This can cause
- problems if certain commodities run in the background, i.e
- blanker.
-
- 'w' : This parameter enables the options 'm', 't' and 'g'. In the
- case that one of these options doesn't work, the parameter
- 'w' should not be used.
-
- NEW: Since V1.6, the voxelspace demo supports the OS3.0 multibuffering with
- P96 (only if P96 is installed). Therefore an appropriate new version of
- P96 has to be installed so that the demo still works with the modes
- WARP/TURBOGFX and CGFXPLUS.
-
- Finally I want to mention a known problem when using multibuffering
- with CyberGFX. Crashs can occur, if the mousebuttons are pressed.
- Usually some commodities are responsible for these problems. In this
- case these commodities should be disabled or the voxelspace demo
- should be startet without the parameters 'w', 'c' and 'g'.
-
-
-