2.1 Data structure

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Title data specifications

Data 2D point data

Data Name MthXy

No 1

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

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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; 

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Title data specifications

Data 3 rows and 4 columns matrix data

Data Name MthMatrix

No 3

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

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Title data specifications

Data matrix stack table

Data Name MthMatrixTbl

No 4

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

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Title data specifications

Data Polygon data string coordinate conversion parameters

Data Name MthPolyTransParm

No 5

 typedef struct MthPolyTransParm {
     MthViewLight *viewLight; /* Coordinate system transformation parameter */
     Uint32 surfCount; /* Number of polygon faces */
     MthXyz *surfPoint; /* Representative point of polygon surface for surface brightness calculation */
     MthXyz *surfNormal; /* Normal of polygon surface */
     Sint32 *surfBright; /* Brightness calculation result of polygon surface */
     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 transformation */
     Uint32 gourVertCount; /* Number of vertex entries for 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 transformation */
     MthXyz *transWorldVertAns; /* Vertex data after world coordinate transformation */
} MthPolyTransParm; 

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Title data specifications

Data Coordinate system transformation parameters

Data Name MthViewLight

No 6

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