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GPU: Clarify description for Rectangle Fill command

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Albert Liu 2021-03-20 02:18:27 -07:00
parent 272da1ca70
commit 7d1e6f67bf
1 changed files with 3 additions and 5 deletions
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docs/graphicsprocessingunitgpu.md
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@ -108,12 +108,10 @@ only seen in some demos, and never in actual games.<br/>
Fills the area in the frame buffer with the value in RGB. Horizontally the
filling is done in 16-pixel (32-bytes) units (see below masking/rounding).<br/>
The "Color" parameter is a 24bit RGB value, however, the actual fill data is
16bit: The hardware automatically converts the 24bit RGB value to 15bit RGB
(with bit15=0).<br/>
Fill is NOT affected by the Mask settings (acts as if Mask.Bit0,1 are both
zero).<br/>
16bit: The hardware linearly converts the 24bit RGB value to 15bit RGB by dropping the lower 3 bits of each color value and additionally sets the mask bit (bit15) to 0.<br/>
Rectangle filling is not affected by the GP0(E6h) mask setting, acting as if GP0(E6h).0 and GP0(E6h).1 are both zero.<br/>
This command is typically used to do a quick clear, as it'll be faster to run
than an equivalent Rectangle command.
than an equivalent Render Rectangle command.
#### VRAM Overview / VRAM Addressing
VRAM is 1MByte (not mapped to the CPU bus) (it can be read/written only via I/O