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LOuroboros 2022-04-03 14:27:29 -03:00
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commit 3ca9ac5b37
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src/pokemon.c
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@ -6648,18 +6648,21 @@ u16 HoennToNationalOrder(u16 hoennNum)
Spinda has 4 spots, each with an entry in gSpindaSpotGraphics. Each entry contains
a base x and y coordinate for the spot and a 16x16 binary image. Each bit in the image
determines whether that pixel should be considered part of the spot.
The position of each spot is randomized using the Spinda's personality. The entire 32 bit
personality value is used, 4 bits for each coordinate of the 4 spots. If the personality
value is 0x87654321, then 0x1 will be used for the 1st spot's x coord, 0x2 will be used for
the 1st spot's y coord, 0x3 will be used for the 2nd spot's x coord, and so on. Each
coordinate is calculated as (baseCoord + (given 4 bits of personality) - 8). In effect this
means each spot can start at any position -8 to +7 off of its base coordinates (256 possibilities).
The macro then loops over the 16x16 spot image. For each bit in the spot's binary image, if
the bit is set then it's part of the spot; try to draw it. A pixel is drawn on Spinda if the
pixel on Spinda satisfies the following formula: ((u8)(colorIndex - 1) <= 2). The -1 excludes
transparent pixels, as these are index 0. Therefore only colors 1, 2, or 3 on Spinda will
allow a spot to be drawn. These color indexes are Spinda's light brown body colors. To create
the spot it adds 4 to the color index, so Spinda's spots will be colors 5, 6, and 7.
The above is done two different ways in the macro: one with << 4, and one without. This
is because Spinda's sprite is a 4 bits per pixel image, but the pointer to Spinda's pixels
(destPixels) is an 8 bit pointer, so it addresses two pixels. Shifting by 4 accesses the 2nd