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osViGetCurrentLine
Syntax#include <ultra64.h> /* os.h */ u32 osViGetCurrentLine(void);
Argument
None
Return Value
Half-line number
Explanation
This function returns the half-line number currently being sampled. The least significant bit (LSB) of the line number is fixed at 0 during the non-interlace mode, but the field number (0 or 1) is inserted there in the interlace mode. Which of either the even number (0) or odd number (1) is being scanned can be determined from the field number that is returned (in interlace mode, one screen is displayed in two scans).
Comments
The VI is internally controlled in half-line (0.5 line) units by N64. Since there are 525 scan lines in the case of NTSC, the value of the 0.5 line units is used so that 262.5 lines are rendered in one frame. The current line number is obtained by dividing the half-line number obtained with this function by two.
| Non-interlace | :0,2,4,6,...,524, 0,2,4,6,...,524 |
| Interlace | :0,2,4,6,...,524, 1,3,5,7,...,523, 0,2,... |
See Also
osViGetCurrentField
osViGetCurrentMode
Revision History
2/1/1999 Completely rewritten
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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 March 1998 |