OS_ScreenMode 11 (changes)
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OS SWI Calls
» OS_ScreenMode
» OS_ScreenMode 11
OS_ScreenMode 11
(SWI &65)
| Entry | |
|---|---|
| R0 | 11 |
| R1 | New |
| Exit | |
|---|---|
| R1 | Previous (or current, if reading) driver number |
| All other registers preserved | |
Use
The purpose of this call is to select the active video driver/device, driver, or to return the current driver.
Notes
An error will be returned if the selected display Device or Display does not exist, or if the driver refuses to activate.
On RISC OS 5 this selects which GraphicsV Device driver is in use, while onRISC OS Select this selects which VideoV? Display driver is in use.
On RISC OS 5 the value -2 will be returned in R1 if no driver is active. -2 can also be passed in to deactivate the video system, however this is inadvisable as the OS does not fully cope with no driver being active.
Under both RISC OS 5 and RISC OS Select, Service_DisplayChanged will be issued as appropriate in order to notify the rest of the system that the current driver is changing.
See also
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