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al - Audio Library Functions gDP - DP GBI Macros gdSP - General GBI Macros gSP - SP GBI Macros gt - Turbo Microcode RDP gu - Graphics Utilities Math - Math Functions nuSys - NuSystem os - N64 Operating System sp - Sprite Library Functions uh - Host to Target IO 64DD - N64 Disk DriveNintendo® Confidential |
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gDPSetColorDither
Format#include "gbi.h" gDPSetColorDither(Gfx *gdl, unsigned int type) gsDPSetColorDither(unsigned int type)Arguments
- gdl is the pointer to the graphics display list
- type is the type of color dithering (G_CD_MAGICSQ, G_CD_BAYER, G_CD_NOISE, G_CD_ENABLE, or G_CD_DISABLE)
It sets (or disables) various types of color dithering. The RDP pipeline keeps individual color component values in 8-bit precision until the Memory Interface. The framebuffer can only accept color components in 5-bit precision when using 16-bits-per-pixel framebuffer format. Therefore, dithering may be necessary to remove Mach bands.
Ordered dither has the effect of scattering the original complete information into a pixel neighborhood region. The video interface (VI) contains logic to gather or recover the original information within the pixel neighborhood during video display. This feature can be enabled or disabled by calling osViSetSpecialFeatures with either OS_VI_DITHER_FILTER_ON or OS_VI_DITHER_FILTER_OFF, respectively. This yields the best results in removing Mach bands in the low color resolution format (5/5/5 RGB).
Your dither choices for this macro are:
- G_CD_MAGICSQ is an ordered pattern dither. It is the best choice if the video dither filtering is enabled.
- G_CD_BAYER is an ordered pattern dither - the standard Bayer matrix. It is the best choice if the video dither filtering is disabled.
- G_CD_NOISE is a random noise dither.
- G_CD_DISABLE is no dithering.
- G_CD_ENABLE is enable random noise dither. This is for Hardware 1
- compatibility only. For Hardware 2, please use G_CD_MAGICSQ, G_CD_BAYER,
- G_CD_NOISE, or G_CD_DISABLE.
gDPSetAlphaDither
osViSetSpecialFeatures
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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 |