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osViBlack
Format#include <ultra64.h>
void osViBlack(u8 active);
What This Function Does
It is one of the following 16 management functions for the video interface (VI):
- osViGetStatus
- osViGetCurrentMode
- osViGetCurrentLine
- osViGetCurrentField
- osViGetCurrentFramebuffer
- osViGetNextFramebuffer
- osViSetMode
- osViSetEvent
- osViSetSpecialFeatures
- osViSetXScale
- osViSetYScale
- osViSwapBuffer
- osViBlack
- osViFade
- osViRepeatLine
- osCreateViManager
For general information about the VI and its supported modes, codes, and functions, see the osVi page. The general information applies to each of the VI management functions and you should understood it before using any of the VI functions. All 16 functions are described, so you can see how they all work together to manage the VI.
When Nintendo 64 powers on, the boot code sets the timing to NTSC, PAL, or MPAL and blanks out the video. The call to osCreateViManager initializes the video to LAN1 (in either NTSC, PAL, or MPAL mode) and also blanks out the video. The first time video is enabled is when osViSetMode is called. To keep the screen blank until after the first use of osViSwapBuffer, call osViBlack(TRUE) immediately after the osViSetMode call. Then call osViBlack(FALSE) right before the first call to osViSwapBuffer.
Based on the active flag setting, which can be TRUE (enabled, screen black) or FALSE (disabled), the osViBlack function can black out the screen and still generate vertical retrace signals. You can only use osViBlack when the YScale factor for the video mode is 1.0. Using it for YScale factors that are not 1.0 creates the potential for the video interface to malfunction and enter a state that cannot be exited without resetting the system.
See Also
osViGetStatus
osViGetCurrentMode
osViGetCurrentLine
osViGetCurrentField
osViGetCurrentFramebuffer
osViGetNextFramebuffer
osViSetMode
osViSetEvent
osViSetSpecialFeatures
osViSetXScale
osViSetYScale
osViSwapBuffer
osViFade
osViRepeatLine
osCreateViManager
osSetEventMesg
osGetTime
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Nintendo® Confidential Warning: all information in this document is confidential and covered by a non-disclosure agreement. You are responsible for keeping this information confidential and protected. Nintendo will vigorously enforce this responsibility. Copyright © 1998 Nintendo of America Inc. All rights reserved Nintendo and N64 are registered trademarks of Nintendo Last updated January 1998 |