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en:docs:os2:api:vio [2021/09/14 08:07] – prokushev | en:docs:os2:api:vio [2021/09/14 09:51] (current) – prokushev | ||
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OS/2 Video subsystem placed in VIOCALLS.DLL. Called VIO function passes control to internal VIO router function which, depends on registered functions replacement, | OS/2 Video subsystem placed in VIOCALLS.DLL. Called VIO function passes control to internal VIO router function which, depends on registered functions replacement, | ||
+ | |||
+ | In pseudo code it looks like this | ||
+ | |||
+ | < | ||
+ | Application calls VioGetAnsi in VIOCALLS | ||
+ | VioGetAnsi calls VioRoute | ||
+ | if AVS registered then | ||
+ | VioRoute calls AVS VioGetAnsi | ||
+ | if AVS VioGetAnsi requires to call BVS then | ||
+ | VioRouter сalls BVS VioGetAnsi | ||
+ | else | ||
+ | VioRouter calls BVS VioGetAnsi | ||
+ | Return to application | ||
+ | </ | ||
OS/2 1.1 introduced Program Manager and VIO was extended to support windowed OS/2 text-based sessions. This extended Vio was named as Advanced VIO. | OS/2 1.1 introduced Program Manager and VIO was extended to support windowed OS/2 text-based sessions. This extended Vio was named as Advanced VIO. | ||
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</ | </ | ||
- | In OS/2 2.0 and later VIO still 16-bit. In late OS/2 versions (3.x?) actual | + | In pseudo |
+ | < | ||
+ | Application calls VioGetAnsi in VIOCALLS | ||
+ | VioGetAnsi calls VioRoute | ||
+ | if AVS registered then | ||
+ | VioRoute calls AVS VioGetAnsi | ||
+ | if AVS VioGetAnsi requires to call BVS then | ||
+ | VioRouter сalls BVS VioGetAnsi | ||
+ | else | ||
+ | VioRouter calls BVS VioGetAnsi | ||
+ | If GVS registered then | ||
+ | VioRouter calls GVS VioGetAnsi | ||
+ | Return to application | ||
+ | </ | ||
+ | |||
+ | In OS/2 2.0 and later VIO still 16-bit. In late OS/2 versions (3.x?) actual code of Video subsystem and Base Video Subsysten was moved to DOSCALLS.DLL (see Fig). VIOCALLS and BVSCALLS is a forwarders to DOSCALLS. | ||
+ | |||
+ | As not part of official OS/2 distribution three independed versions of 32-to-16 bit wrapper subsystems was developed (See Fig). EXMWRAP.DLL was part of eComstation 1.0 and later releases. | ||
< | < | ||
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|DDD|DDD=Global Video Subsystem | |DDD|DDD=Global Video Subsystem | ||
</ | </ | ||
+ | |||
+ | < | ||
+ | Application calls VioGetAnsi in VIOCALLS | ||
+ | VIOCALLS forwards to DOSCALLS | ||
+ | VioGetAnsi calls VioRoute | ||
+ | if AVS registered then | ||
+ | VioRoute calls AVS VioGetAnsi | ||
+ | if AVS VioGetAnsi requires to call BVS then | ||
+ | VioRouter сalls BVS VioGetAnsi | ||
+ | BVSCALLS forwards to DOSCALLS | ||
+ | else | ||
+ | VioRouter calls BVS VioGetAnsi | ||
+ | BVSCALLS forwards to DOSCALLS | ||
+ | If GVS registered then | ||
+ | VioRouter calls GVS VioGetAnsi | ||
+ | Return to application | ||
+ | </ | ||
osFree attempts to combine all aproaches and provide following callflow | osFree attempts to combine all aproaches and provide following callflow | ||
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||||| |!@4 | | ||||| |!@4 | | ||
||||| CCC |CCC=VIO router | ||||| CCC |CCC=VIO router | ||
- | ||||| |!@4 | | ||
- | ||||| DDD |DDD=Global Video Subsystem | ||
||||| |!@4 | | ||||| |!@4 | | ||
||||| EEE |EEE=[[en: | ||||| EEE |EEE=[[en: | ||
Line 104: | Line 150: | ||
||||| |!@4 | | ||||| |!@4 | | ||
||||| EEE |EEE=Base Video Handlers | ||||| EEE |EEE=Base Video Handlers | ||
+ | ||||| |!@4 | | ||
+ | ||||| EEE |EEE=[[en: | ||
+ | ||||| |!@4 | | ||
+ | ||||| CCC |CCC=VIO router | ||
+ | ||||| |!@4 | | ||
+ | ||||| DDD |DDD=Global Video Subsystem | ||
</ | </ | ||
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| AAA |AAA=Application | | AAA |AAA=Application | ||
| |!@4 | | | |!@4 | | ||
- | | BBB |BBB=[[en: | + | | BBB |BBB=[[en: |
</ | </ | ||