2017-02-01

directx初第九卷

纹理

纹理映射

声明变量

IDirect3DTexture9* texture = 0;

创建纹理贴图

//读取纹理图片（设备指针，纹理图片地址，把结果存到贴图指针）
D3DXCreateTextureFromFile(g_pd3dDevice, "UnityPlayerIcon.png", &texture);
//读取纹理图片（设备指针，纹理图片地址，使用贴图宽度，使用贴图高度，渐进纹理级数，标志，纹理格式，
//保存纹理方式，纹理过滤方式，生成纹理序列的过滤方式，替换alpha值的颜色值，通常为null，调色板地址，把结果存到贴图指针）
D3DXCreateTextureFromFileEx(g_pd3dDevice, "UnityPlayerIcon.png", 0, 0, 6, 0, D3DFMT_X8R8G8B8,
D3DPOOL_MANAGED, D3DX_DEFAULT, D3DX_DEFAULT, 0xFF000000, 0, 0, &texture);

设置纹理贴图

//设置贴图（应用到纹理第一层，贴图指针）
g_pd3dDevice->SetTexture(0, texture);

纹理过滤

最近采样点纹理过滤

g_pd3dDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_POINT);
g_pd3dDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_POINT);

线性纹理过滤

g_pd3dDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
g_pd3dDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);

各向异性纹理过滤

//3为采样级数，越大越清晰
g_pd3dDevice->SetSamplerState(0, D3DSAMP_MAXANISOTROPY, 3);
g_pd3dDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_ANISOTROPIC);
g_pd3dDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_ANISOTROPIC);

多级渐进纹理过滤

g_pd3dDevice->SetSamplerState(0, D3DSAMP_MIPFILTER, D3DTEXF_LINEAR);
//2为采样级数，越大越模糊
g_pd3dDevice->SetSamplerState(0, D3DSAMP_MAXMIPLEVEL, 2);

纹理寻址

重复纹理寻址

g_pd3dDevice->SetSamplerState(0, D3DSAMP_ADDRESSU, D3DTADDRESS_WRAP);
g_pd3dDevice->SetSamplerState(0, D3DSAMP_ADDRESSV, D3DTADDRESS_WRAP);

镜像纹理寻址

g_pd3dDevice->SetSamplerState(0, D3DSAMP_ADDRESSU, D3DTADDRESS_MIRROR);
g_pd3dDevice->SetSamplerState(0, D3DSAMP_ADDRESSV, D3DTADDRESS_MIRROR);

夹取纹理寻址

g_pd3dDevice->SetSamplerState(0, D3DSAMP_ADDRESSU, D3DTADDRESS_CLAMP);
g_pd3dDevice->SetSamplerState(0, D3DSAMP_ADDRESSV, D3DTADDRESS_CLAMP);

边框纹理寻址

g_pd3dDevice->SetSamplerState(0, D3DSAMP_ADDRESSU, D3DTADDRESS_BORDER);
g_pd3dDevice->SetSamplerState(0, D3DSAMP_ADDRESSV, D3DTADDRESS_BORDER);

纹理寻址没有效果？

定义顶点缓存的uv

struct VERTEX
{
	float _x, _y, _z;               
	float _u, _v; // 纹理坐标
	VERTEX(float x, float y, float z, float u, float v) : _x(x), _y(y), _z(z), _u(u), _v(v) {}
};
#define D3DFVF_VERTEX (D3DFVF_XYZ | D3DFVF_TEX1)

填充

//(x,y,z,n*u,m*v) 其中n和m分别为u和v坐标的缩小倍数
v[0] = VERTEX(-1, 1, -1, 0.0f, 0.0f);
v[1] = VERTEX(1, 1, -1, 2.0f, 0.0f);
v[2] = VERTEX(1, -1, -1, 2.0f, 2.0f);
v[3] = VERTEX(-1, -1, -1, 0.0f, 2.0f);
。。。

本文标题:directx初第九卷

文章作者:小贱

发布时间:2017-02-01, 19:10:52

最后更新:2017-02-22, 16:26:05

原始链接:https://2324268086.github.io/2017/02/01/directx初第九卷/

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