ReC98/th01/hardware/vram_planes_set.asm

; void vram_planes_set(void)
vram_planes_set	proc
	push	bp
	mov	bp, sp
	mov	VRAM_PLANE_B, 0A8000000h
	mov	VRAM_PLANE_R, 0B0000000h
	mov	VRAM_PLANE_G, 0B8000000h
	mov	VRAM_PLANE_E, 0E0000000h
	pop	bp
	ret
vram_planes_set	endp
[Reverse-engineering] 32-bit VRAM plane pointers I've looked at every openly available piece of PC-98 documentation, and there don't seem to be any official names for the individual planes. The closest thing I could find was the description at http://island.geocities.jp/cklouch/column/pc98bas/pc98disphw2.htm explaining that they represent the blue, red, green, and brightness component when using the default PC-98 palette. However, these planes correspond to nothing else but the 4 individual bits of the final index into the color palette, and you can assign any color to every single palette slot. Therefore, it's merely a convention that your own palettes don't have to follow (and in Touhou, they don't). Nevertheless, there doesn't seem to be an alternative, and the Neko Project II source code uses the same B/R/G/E convention, so I'll go with that as well. 2015-02-10 22:43:34 +00:00			`; void vram_planes_set(void)`
			`vram_planes_set proc`
			`push bp`
			`mov bp, sp`
			`mov VRAM_PLANE_B, 0A8000000h`
			`mov VRAM_PLANE_R, 0B0000000h`
			`mov VRAM_PLANE_G, 0B8000000h`
			`mov VRAM_PLANE_E, 0E0000000h`
			`pop bp`
			`ret`
			`vram_planes_set endp`