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Nintendo® Confidential

## guS2DEmuSetScissor

Format

    void guS2DEmuSetScissor (u32 ulx,
       u32 uly, u32 lrx, u32 lry,
       u8 bilerp);

Arguments

- ulx is the upper-left X coordinate of scissor box (u10.0)

- uly is the upper-left Y coordinate of scissor box (u10.0)

- lrx is the lower-right X coordinate of scissor box (u10.0)

- lry is the lower-right Y coordinate of scissor box (u10.0)

- bilerp is set to a value other than 0 to perform Bilerp interpolation processing on the image, or it is set to 0 for PointSample

Explanation
This function sets the scissoring parameters and texture filter referenced by the guS2DEmuBgRect1Cyc function. It is one of the following two new emulation functions that came with the S2DEX microcode that you can use to have the CPU emulate the S2DEX microcode:

- guS2DEmuGBgRect1Cyc
- guS2DEmuSetScissor

Usually, the range of the scissor box set by gDPSetScissor is handled by this function as parameters. In addition, the initial values for ulx, uly, lrx, lry, and bilerp are 0, 0, 320, 340, 0, respectively, which are settings that draw to a 320x240 pixel frame buffer with PointSample.
This function need only be called once before guS2DEmuBgRect1Cyc is called. As long as there is no change in the scissor box and texture filter, it need only be called once during game initialization. In other words, you don't need to call it every time a frame is drawn.
For detailed information on S2DEX microcode GBI macros and data structures, please see the "S2DEX Microcode" area of the N64 Programming Manual.
See Also
guS2DInitBg

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Copyright © 1998
Nintendo of America Inc. All rights reserved
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Last Updated April, 1999