ReC98/th04/math/vector1_at.asm

public VECTOR1_AT
vector1_at	proc far

@@angle	= word ptr  6
@@length	= word ptr  8
@@origin	= word ptr  0Ah

	push	bp
	mov	bp, sp
	movsx	eax, [bp+@@length]
	movsx	edx, [bp+@@angle]
	imul	eax, edx
	sar	eax, 8
	add	ax, [bp+@@origin]
	pop	bp
	retf	6
vector1_at	endp
[Position independence] Vector calls and variables Raw, uninteresting position independence work. Or maybe not, given that this was one of the few things that also apply to TH01, and reveal just how chaotically this game was coded. And so we've got three ways that ZUN stored regular 2D points: Regularly (X first, Y second), Y first and X second, and multiple points stored in a structure of arrays… Completes P0059, funded by [Anonymous] and -Tom-. 2019-11-17 19:23:49 +00:00			`public VECTOR1_AT`
[Reduction] Separate functions for 1D and 2D vector construction Look at that TH05 vector2_at_opt function. What the hell, the caller is supposed to set up the stack frame for the function? How do you even get a compiler to do this (and no, I haven't found a compiler switch)? No way around writing a separate "optimizer" as part of the compilation pipeline, it seems. 2017-01-08 20:01:13 +00:00			`vector1_at proc far`

			`@@angle = word ptr 6`
			`@@length = word ptr 8`
			`@@origin = word ptr 0Ah`

			`push bp`
			`mov bp, sp`
			`movsx eax, [bp+@@length]`
			`movsx edx, [bp+@@angle]`
			`imul eax, edx`
			`sar eax, 8`
			`add ax, [bp+@@origin]`
			`pop bp`
			`retf 6`
			`vector1_at endp`