18-143
MB86R02 ‘Jade-D’ Hardware Manual V1.64
18.9.1.2
Model-view-projection (MVP) transformation
The geometry engine transforms the vertex of the “OC” coordinate system specified by the G_Vertex
packet to the “CC” coordinate system according to the coordinate transformation matrix (OC
→
CC
Matrix) specified by the G_LoadMatrix packet. The “OC
→
CC Matrix” is a “4
×
4” matrix consisting of
a ModelView matrix and a Projection matrix.
If “Zoc” is not contained in the input parameter of the G_Vertex packet (Z-bit of GMDR0 is off), (OC
→
CC) coordinate transformation is processed as “Zoc = 0”.
When GMDR0[0] is 0 (orthogonal projection transformation), OC
→
CC coordinate transformation is
processed as “Wcc = 1.0”. (Work only for C=0,Z=0 and ST=0 (XY only vertex) mode)
OC: Object Coordinates
CC: Clip Coordinates
Ma0 to Md3: OC
→
CC Matrix
Xoc to Zoc: X, Y and Z of OC coordinate system
Xcc to Woc: X, Y, Z and W of CC coordinate system
18.9.1.3
3D-2D transformation (CC
→
NDC coordinate transformation)
The geometry engine divides “XYZ” of the “CC” coordinate system by “Wcc” (Perspective Division).
NDC: Normalized Device Coordinates
Xndc to Zndc: X, Y and Z of “NDC” coordinate system
Ma0
Mb0
Mc0
Md0
Ma1
Mb1
Mc1
Md1
Ma2
Mb2
Mc2
Md2
Ma3
Mb3
Mc3
Md3
Xcc
Ycc
Zcc
Wcc
Xoc
Yoc
Zoc
1
=
Xndc
Yndc
Zndc
=
1/Wcc
Xcc
Ycc
Zcc
Содержание MB86R02
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