Direct3D 9学习笔记(5)颜色

一.三个宏

// D3DCOLOR is equivalent to D3DFMT_A8R8G8B8
#ifndef D3DCOLOR_DEFINED
typedef DWORD D3DCOLOR;
#define D3DCOLOR_DEFINED
#endif

// maps unsigned 8 bits/channel to D3DCOLOR
#define D3DCOLOR_ARGB(a,r,g,b) \
((D3DCOLOR)((((a)&0xff)<<24)|(((r)&0xff)<<16)|(((g)&0xff)<<8)|((b)&0xff)))
#define D3DCOLOR_RGBA(r,g,b,a) D3DCOLOR_ARGB(a,r,g,b)
#define D3DCOLOR_XRGB(r,g,b)   D3DCOLOR_ARGB(0xff,r,g,b)

二.D3DXCOLOR,D3DCOLORVALUE

typedef struct _D3DCOLORVALUE {
float r;
float g;
float b;
float a;
} D3DCOLORVALUE;

typedef struct D3DXCOLOR
{
#ifdef __cplusplus
public:
D3DXCOLOR() {};
D3DXCOLOR( UINT  argb );
D3DXCOLOR( CONST FLOAT * );
D3DXCOLOR( CONST D3DXFLOAT16 * );
D3DXCOLOR( FLOAT r, FLOAT g, FLOAT b, FLOAT a );

// casting
operator UINT  () const;

operator FLOAT* ();
operator CONST FLOAT* () const;

// assignment operators
D3DXCOLOR& operator += ( CONST D3DXCOLOR& );
D3DXCOLOR& operator -= ( CONST D3DXCOLOR& );
D3DXCOLOR& operator *= ( FLOAT );
D3DXCOLOR& operator /= ( FLOAT );

// unary operators
D3DXCOLOR operator + () const;
D3DXCOLOR operator - () const;

// binary operators
D3DXCOLOR operator + ( CONST D3DXCOLOR& ) const;
D3DXCOLOR operator - ( CONST D3DXCOLOR& ) const;
D3DXCOLOR operator * ( FLOAT ) const;
D3DXCOLOR operator / ( FLOAT ) const;

friend D3DXCOLOR operator * ( FLOAT, CONST D3DXCOLOR& );

BOOL operator == ( CONST D3DXCOLOR& ) const;
BOOL operator != ( CONST D3DXCOLOR& ) const;

#endif //__cplusplus
FLOAT r, g, b, a;
} D3DXCOLOR, *LPD3DXCOLOR;

三.顶点着色

// Initialize three Vertices for rendering a triangle
CUSTOMVERTEX Vertices[] =
{
{ 150.0f,  50.0f, 0.5f, 1.0f, 0xffff0000, }, // x, y, z, rhw, color
{ 250.0f, 250.0f, 0.5f, 1.0f, 0xff00ff00, },
{  50.0f, 250.0f, 0.5f, 1.0f, 0xff00ffff, },
};