在之前，要进行下封装。
好吧，先加个类，ddraw_math类吧。顺便把ddraw引擎中的几个矩阵弄到ddraw_math类中来，让接口和数学相分离开。
头文件有这些
#pragma once
// a 2D vertex
typedef struct VERTEX2DI_TYP
{
int x,y; // the vertex
} VERTEX2DI, *VERTEX2DI_PTR;
typedef struct VERTEX2DF_TYP
{
float x,y; // the vertex
} VERTEX2DF, *VERTEX2DF_PTR;
// a 2D polygon
typedef struct POLYGON2D_TYP
{
int state; // state of polygon
int num_verts; // number of vertices
int x0,y0; // position of center of polygon
int xv,yv; // initial velocity
DWORD color; // could be index or PALETTENTRY
VERTEX2DF *vlist; // pointer to vertex list
} POLYGON2D, *POLYGON2D_PTR;
typedef struct MATRIX1X2_TYP
{
union
{
float M[2];
struct
{
float M00, M01;
};
};
}MATRIX1X2, * MATRIX1X2_PTR;
typedef struct MATRIX1X3_TYP
{
union
{
float M[3];
struct
{
float M00, M01, M02;
};
};
}MATRIX1X3, * MATRIX1X3_PTR;
typedef struct MATRIX3X2_TYP
{
union
{
float M[3][2];
struct
{
float M00, M01;
float M10, M11;
float M20, M21;
};
};
}MATRIX3X2, * MATRIX3X2_PTR;
typedef struct MATRIX3X3_TYP
{
union
{
float M[3][3];
struct
{
float M00, M01, M02;
float M10, M11, M12;
float M20, M21, M22;
};
};
}MATRIX3X3, * MATRIX3X3_PTR;
class ddraw_math
{
public:
ddraw_math(void);
~ddraw_math(void);
private:
float cos_look[360];
float sin_look[360];
public:
void Build_Sin_Cos_Tables( void );
int Clip_Line( int & x1, int & y1, int &x2, int & y2 );
void Draw_Bottom_Tri( int x1, int y1, int x2, int y2, int x3, int y3, int color, UCHAR * dest_buffer, int mempitch );
void Draw_Bottom_TriFP( int x1, int y1, int x2, int y2, int x3, int y3, int color, UCHAR * dest_buffer, int mempitch );
void Draw_Bottom_Tri16( int x1, int y1, int x2, int y2, int x3, int y3, int color, UCHAR * _dest_buffer, int mempitch );
int Draw_Clip_Line( int x0, int y0, int x1, int y1, int color, UCHAR * dest_buffer, int lpitch );
int Draw_Clip_Line16( int x0, int y0, int x1, int y1, int color, UCHAR * dest_buffer, int lpitch );
int Draw_Line( int x0, int y0, int x1, int y1, int color, UCHAR * vb_start, int lpitch );
int Draw_Line16( int x0, int y0, int x1, int y1, int color, UCHAR * vb_start, int lpitch );
int Draw_Polygon2D( POLYGON2D_PTR poly, UCHAR * vbuffer, int lpitch );
int Draw_Polygon2D16( POLYGON2D_PTR poly, UCHAR * vbuffer, int lpitch );
void Draw_QuadFP_2D( int x0,int y0,int x1,int y1,
int x2,int y2,int x3, int y3,
int color,UCHAR *dest_buffer, int mempitch);
void Draw_Top_Tri( int x1, int y1, int x2, int y2, int x3, int y3, int color, UCHAR * dest_buffer, int mempitch );
void Draw_Top_TriFP( int x1, int y1, int x2, int y2, int x3, int y3, int color, UCHAR * dest_buffer, int mempitch );
void Draw_Top_Tri16( int x1, int y1, int x2, int y2, int x3, int y3, int color, UCHAR * _dest_buffer, int mempitch );
void Draw_Triangle_2D( int x1, int y1, int x2, int y2, int x3, int y3, int color, UCHAR * dest_buffer, int mempitch );
void Draw_TriangleFP_2D( int x1, int y1, int x2, int y2, int x3, int y3, int color, UCHAR * dest_buffer, int mempitch );
void Draw_Triangle_2D16( int x1, int y1, int x2, int y2, int x3, int y3, int color, UCHAR * dest_buffer, int mempitch );
int Mat_Init_3X2( MATRIX3X2_PTR ma, float m00, float m01, float m10, float m11, float m20, float m21 );
int Mat_Mul1X2_3X2( MATRIX1X2_PTR ma, MATRIX3X2_PTR mb, MATRIX1X2_PTR mprod );
int Mat_Mul1X3_3X3( MATRIX1X2_PTR ma, MATRIX3X2_PTR mb, MATRIX1X2_PTR mprod );
int Mat_Mul3X3( MATRIX1X2_PTR ma, MATRIX3X2_PTR mb, MATRIX1X2_PTR mprod );
void Mem_Set_WORD( void * dest, USHORT data, int count );
int Rotate_Polygon2D(POLYGON2D_PTR poly, int theta);
int Rotate_Polygon2D_Mat(POLYGON2D_PTR poly, int theta);
int Scale_Polygon2D(POLYGON2D_PTR poly, float sx, float sy);
int Scale_Polygon2D_Mat(POLYGON2D_PTR poly, float sx, float sy);
int Translate_Polygon2D( POLYGON2D_PTR poly, int dx, int dy );
int Translate_Polygon2D_Mat( POLYGON2D_PTR poly, int dx, int dy );
};
当然，现在其实也能提取出矩阵来，不过，不过目前还没有必要，所以先放在这里，然后移植成员函数，
由于还有些数据类型没定义，所以
#include “common.h”
再次编译，发现那些m_min_clip_x等，没有定义，原因是和显示部分的裁剪区发生了耦合，那只能再加上个函数，
void ddraw_math::setClipRect( RECT rect )
{
m_min_clip_x = rect.left;
m_max_clip_x = rect.right;
m_min_clip_y = rect.bottom;
m_max_clip_y = rect.right;
}
然后在DDRAW初始化时，传递过去即可，
可以再次验证下。是OK的。
