Direct3D 9学习笔记(6)纹理概念

即贴图

一.加载图片资源

二.设置当前纹理

SetTexture方法

D3DXCreateTextureFromFile(
    Device,
    "dx5_logo.bmp",
    &Tex);

Device->SetTexture(0, Tex);

三.纹理过滤器

两种情况:放大和缩小

三种设置方式

//
// Values for D3DSAMP_***FILTER texture stage states
//
typedef enum _D3DTEXTUREFILTERTYPE
{
    D3DTEXF_NONE            = 0,    // filtering disabled (valid for mip filter only)
    D3DTEXF_POINT           = 1,    // nearest
    D3DTEXF_LINEAR          = 2,    // linear interpolation
    D3DTEXF_ANISOTROPIC     = 3,    // anisotropic
    D3DTEXF_PYRAMIDALQUAD   = 6,    // 4-sample tent
    D3DTEXF_GAUSSIANQUAD    = 7,    // 4-sample gaussian
/* D3D9Ex only -- */
#if !defined(D3D_DISABLE_9EX)

    D3DTEXF_CONVOLUTIONMONO = 8,    // Convolution filter for monochrome textures

#endif // !D3D_DISABLE_9EX
/* -- D3D9Ex only */
    D3DTEXF_FORCE_DWORD     = 0x7fffffff,   // force 32-bit size enum
} D3DTEXTUREFILTERTYPE;

设置方法

Device->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
Device->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);

四.渐进纹理链

即一个图片一下子缩小到很小就可能会产生较大差异化,逐步减小以尽量保持原图质量

设置多级渐进纹理过滤器

五.总结