Register Assignments

Registers listed in red must not be overwritten by anything other than the NW4C shader and geometry shader.
Registers listed in green can be changed by user shaders.
The remaining registers are in regions that are used by the library in the current version.
You can change the names of the input registers. The Usage column indicates items that must be specified.

Default Name	Default Register	Usage	Number	Description
Input Registers (12 registers)
`aPosition.xyz`	`v0`	Position	1	Position information of vertex
`aNormal.xyz`	`v1`	Normal	1	Normal vector information of vertex
`aTangent.xyz`	`v2`	Tangent	1	Tangent vector information of vertex
`aColor`	`v3`	Color	1	Color information of vertex (`w` is used together with the hemispherical light alpha)
`aTexCoord0.xy`	`v4`	TexCoord0	1	Texture coordinate information of vertex
`aTexCoord1.xy`	`v5`	TexCoord1	1	Texture coordinate information of vertex
`aTexCoord2.xy`	`v6`	TexCoord2	1	Texture coordinate information of vertex
`aBoneIndex`	`v7`	BoneIndex	1	Bone index number information of vertex
`aBoneWeight`	`v8`	BoneWeight	1	Vertex bone weight information
`aUserAttribute?`	`v9`-`v11`	UserAttribute?	0～12	User attribute information of vertex

Name	Registers	Number	Description
Constant Registers (96 registers)
`WrldMtx`	`c0`	3	World matrix
`NormMtx`	`c3`	3	Normal matrix
`PosOffs`	`c6`	1	Position offset for input registers
`IrScale`	`c7`	2	Scale for input register
			`m00`: Position, `m01`: Normal, `m02`: Tangent, `m03`: Color
			`m10`: TexCoord0, `m11`: TexCoord1, `m12`: TexCoord2, `m13`: BoneWeight
-	`c8`	1	Reserved
`TexcMap.xyz`	`c10`	1	Texture coordinate allocation
			`UvCoordinateMap(0.0-2.0)`, `CameraSphereEnvMap(0.0)`, `CameraCubeEnvMap(4.0)`, `ProjectionMap(0.0)`
			`x`,`y`,`z`: `Texture0`, `Texture1`, `Texture2`
			Values `0` through `2` represent texture assignments, while `3` and `4` represent `Cube` and `SphereMap`, respectively.
`TexMtx0`	`c11`	3	Texture coordinate matrix `0`
`TexMtx1`	`c14`	3	Texture coordinate matrix `1`
`TexMtx2`	`c17`	2	Texture coordinate matrix `2`
`TexTran`	`c19`	1	Texture translation (uses `Tex0` and `Tex1` projection maps)
`MatAmbi`	`c20`	1	Material ambient color (`w` = `VertexColorScale`)
`MatDiff`	`c21`	1	Material diffuse color
`HslGCol`	c22	1	Ground color for hemispherical lighting
`HslSCol`	`c23`	1	Space color for hemispherical lighting
`HslSDir`	`c24`	1	Directional vector toward space for hemispherical lighting (`w` = `LerpFactor`)
`UnivReg`	`c25`	60	Universal register (Mutable. Set first half for matrix palette, second half for lights)
`bn` = number of bones `ln` = number of vertex lights		3 x `bn`	Position matrix
		1 x `ln`	Light ambient color
		1 x `ln`	Light diffuse color
		1 x `ln`	Light position (`w` = `IsDirectionalLight`)
		1 x `ln`	Spotlight direction (`w` = `IsSpotLightEnabled`)
		1 x `ln`	Light distance attenuation parameters (`x` = `K0`, `y` = `K1`, `z` = `K2`, `w` = `IsAttenuationDistanceEnabled`)
		1 x `ln`	Light spot parameters (`x` = `SpotExponent`, `y` = `SpotCutoffAngle`)
-	`c85`	1	Empty
`ProjMtx`	`c86`	4	Projection matrix
`ViewMtx`	`c90`	3	(Model) View matrix
-	`c93`	3	Constant value

Name	Registers	Number	Description
Boolean Registers (16 registers)
	`b0`	1	Reserved by DMP
`IsSmoSk`	`b1`	1	Skinning ON/OFF
`IsRgdSk`	`b2`	1	Rigid skinning ON/OFF
-	`b3`	1	Empty
-	`b4`	1	Empty
`IsHemiL`	`b5`	1	Hemispherical light ON/OFF
`IsHemiO`	`b6`	1	Hemispherical light occlusion ON/OFF
`IsVertA`	`b7`	1	Vertex color alpha ON/OFF
`IsBoneW`	`b8`	1	Bone weight ON/OFF
`UvMap0`	`b9`	1	UV mapping `0` ON/OFF
`UvMap1`	`b10`	1	UV mapping `1` ON/OFF
`UvMap2`	`b11`	1	UV mapping `2` ON/OFF
`IsVertL`	`b12`	1	Vertex lighting ON/OFF
`IsTex1`	`b13`	1	Texture `1` ON/OFF
`IsTex2`	`b14`	1	Texture `2` ON/OFF
`IsQuate`	`b15`	1	Quaternion calculation ON/OFF

Name	Registers	Number	Description
Integer Registers (4 registers)
`LightCt`	`i0`	1	Number of vertex lights (loop counter)
	`i1`	1	Empty
	`i2`	1	Empty
	`i3`	1	Empty

Shader Registers

Shader Register List

Universal Register Assignments