2.1 Data structure

List

Title Data specifications

Data 2D point data

Data Name MthXy

No 1

typedef struct MthXy {
     Fixed32 x; / * X coordinate * /
     Fixed32 y; / * Y coordinate * /
} MthXy; 

List

Title Data specifications

Data 3D point data

Data Name MthXyz

No 2

typedef struct MthXyz {
     Fixed32 x; / * X coordinate * /
     Fixed32 y; / * Y coordinate * /
     Fixed32 z; / * Z coordinate * /
} MthXyz; 

List

Title Data specifications

Data 3-by-4 matrix data

Data Name MthMatrix

No 3

Typedef struct MthMatrix {
     Fixed32 val [3] [4]; / * 3 rows 4 columns fixed point data * /
} MthMatrix 

List

Title Data specifications

Data Matrix stack table

Data Name MthMatrixTbl

No Four

typedef struct MthMatrixTbl {
     Uint16 stackSize; / * Number of matrix stack entries * /
     MthMatrix * current; / * Current matrix pointer * /
     MthMatrix * stack; / * Matrix stack pointer * /
} MthMatrixTbl; 

List

Title Data specifications

Data Polygon data column coordinate transformation parameters

Data Name MthPolyTransParm

No Five

 typedef struct MthPolyTransParm {
     MthViewLight * viewLight; / * Coordinate system conversion parameters * /
     Uint32 surfCount; / * Number of polygon faces * /
     MthXyz * surfPoint; / * Representative point of polygon surface for surface brightness calculation * /
     MthXyz * surfNormal; / * Polygon surface normal * /
     Sint32 * surfBright; / * Polygon surface brightness calculation result * /
     Uint32 transViewVertCount; / * Number of vertex entries for viewpoint coordinate transformation * /
     MthXyz * transViewVertSrc; / * Vertex data before viewpoint coordinate conversion * /
     MthXyz * transViewVertAns; / * Vertex data after viewpoint coordinate conversion * /
     Uint32 gourVertCount; / * Number of vertex entries in vertex brightness calculation * /
     MthXyz * vertNormal; / * Vertex normal for vertex brightness calculation * /
     Sint32 * vertBright; / * Vertex brightness calculation result * /
     Uint32 transWorldVertCount; / * Number of vertex entries for world coordinate transformation * /
     MthXyz * transWorldVertSrc; / * Vertex data before world coordinate conversion * /
     MthXyz * transWorldVertAns; / * Vertex data after world coordinate transformation * /
} MthPolyTransParm; 

List

Title Data specifications

Data Coordinate system transformation parameters

Data Name MthViewLight

No 6

 typedef struct MthViewLight {
     MthMatrix viewMatrix; / * Conversion matrix to viewpoint coordinate system * /
     MthXyz lightVector; / * Light source vector in the viewpoint coordinate system * /
     MthMatrix worldMatrix; / * Conversion matrix to world coordinate system * /
} MthViewLight;