.global skinPipe

.equ vertexTop, 0x2d0
.equ numInAttribs, 5
.equ numOutAttribs, 3
.equ numOutBuf, 2
.equ vertCount, ((vertexTop-numOutBuf)/(numInAttribs*2+numOutAttribs*numOutBuf))
.equ offset, (vertCount*numInAttribs)
.equ outBuf1, (2*offset)
.equ outSize, ((vertexTop-outBuf1-2)/2)
.equ outBuf2, (outBuf1+outSize)

.equ lightMat,		0x3d0
.equ lightDir,		0x3d4
.equ matrix, 		0x3f0
.equ screenOffset, 	0x3f9
.equ gifTag, 		0x3fa
.equ matColor, 		0x3fb
.equ ambientLight, 	0x3fd

.balign 16,0
skinPipe:
DMAret *
MPG 0, *
.vu
Start:
	NOP	LQ VF25, screenOffset(VI00)
	NOP	LQ VF28, matrix(VI00)
	NOP	LQ VF29, matrix+1(VI00)
	NOP	LQ VF30, matrix+2(VI00)
	NOP	LQ VF31, matrix+3(VI00)
	NOP	IADDIU VI12, VI00, outBuf1
	NOP	IADDIU VI13, VI00, outBuf2
Cnt:
	NOP	XTOP VI02			; input pointer
	NOP	LQ VF01, gifTag(VI00)
	NOP	XITOP VI01			; vertex count
	NOP	IADDIU VI05, VI00, 0x4000
	NOP	IADD VI05, VI05, VI05
	NOP	IOR VI05, VI05, VI01
	NOP	SQ VF01, 0(VI12)
	NOP	ISW.x VI05, 0(VI12)
	NOP	IADDIU VI03, VI12, 1		; output pointer
	NOP	LQ VF18, lightMat(VI00)
	NOP	LQ VF19, lightMat+1(VI00)
	NOP	LQ VF20, lightMat+2(VI00)

Loop:
	NOP	LQI VF01, (VI02++)	; vertex
	NOP	LQI VF02, (VI02++)	; UV - skip
	NOP	LQI VF02, (VI02++)	; color
	NOP	LQI VF03, (VI02++)	; normal
	NOP	IADDIU VI02, VI02, 1	; skip weights

	MULAw.xyzw ACC, VF31, VF00w	NOP
	MADDAx.xyzw ACC, VF28, VF01x	NOP
	MADDAy.xyzw ACC, VF29, VF01y	NOP
	MADDz.xyzw VF01, VF30, VF01z	NOP
	ITOF0 VF02, VF02	NOP
	ITOF0[I] VF03, VF03	LOI 0.0078125	; - normal scale
	NOP	NOP
	NOP	DIV Q, VF00w, VF01w
	NOP	WAITQ
	MULq	VF01, VF01, Q	NOP	; perspective division
	MULi VF03, VF03, I	NOP	; scale normal
	NOP	NOP
	NOP	NOP
	SUB.w VF01, VF01, VF01	NOP
	MULAx.xyz ACC, VF18, VF03x	NOP	; transform normal
	MADDAy.xyz ACC, VF19, VF03y	NOP
	MADDz.xyz VF03, VF20, VF03z	NOP
	ADD.xy VF01, VF01, VF25	NOP
	NOP	NOP
	NOP	NOP
	FTOI0 VF02, VF02	NOP
	FTOI4 VF01, VF01	NOP
	NOP	SQ VF03, -2(VI02)	; store normal
	NOP	IADDI VI01, VI01, -1
	NOP	SQI VF02, (VI03++)	; color
	NOP	SQI VF01, (VI03++)	; vertex
	NOP	IBNE VI01, VI00, Loop
	NOP	NOP

	.include "light.vu"

	NOP	XGKICK VI12
	NOP	IADD VI15,VI00,VI12
	NOP	IADD VI12,VI00,VI13
	NOP[E]	IADD VI13,VI00,VI15
	NOP	NOP
	NOP	B Cnt
	NOP	NOP

.EndMPG
.EndDmaData