DAY43:阅读纹理之Texture Object API

B.8. Texture Functions

Texture objects are described in Texture Object API

Texture references are described in Texture Reference API

Texture fetching is described in Texture Fetching.

B.8.1. Texture Object API

B.8.1.1. tex1Dfetch()

template<class T>
T tex1Dfetch(cudaTextureObject_t texObj, int x);

fetches from the region of linear memory specified by the one-dimensional texture object texObj using integer texture coordinate x. tex1Dfetch() only works with non-normalized coordinates, so only the border and clamp addressing modes are supported. It does not perform any texture filtering. For integer types, it may optionally promote the integer to single-precision floating point.

B.8.1.2. tex1D()

template<class T>
T tex1D(cudaTextureObject_t texObj, float x);

fetches from the CUDA array specified by the one-dimensional texture object texObj using texture coordinate x.

B.8.1.3. tex1DLod()

template<class T>
T tex1DLod(cudaTextureObject_t texObj, float x, float level);

fetches from the CUDA array specified by the one-dimensional texture object texObj using texture coordinate x at the level-of-detail level.

B.8.1.4. tex1DGrad()

template<class T>
T tex1DGrad(cudaTextureObject_t texObj, float x, float dx, float dy);

fetches from the CUDA array specified by the one-dimensional texture object texObj using texture coordinate x. The level-of-detail is derived from the X-gradient dx and Y-gradient dy.

B.8.1.5. tex2D()

template<class T>
T tex2D(cudaTextureObject_t texObj, float x, float y);

fetches from the CUDA array or the region of linear memory specified by the two-dimensional texture object texObj using texture coordinate (x,y).

B.8.1.6. tex2DLod()

template<class T>
tex2DLod(cudaTextureObject_t texObj, float x, float y, float level);

fetches from the CUDA array or the region of linear memory specified by the two-dimensional texture object texObj using texture coordinate (x,y) at level-of-detail level.

B.8.1.7. tex2DGrad()

template<class T>
T tex2DGrad(cudaTextureObject_t texObj, float x, float y,
            float2 dx, float2 dy);

fetches from the CUDA array specified by the two-dimensional texture object texObj using texture coordinate (x,y). The level-of-detail is derived from the dx and dy gradients.

B.8.1.8. tex3D()

template<class T>
T tex3D(cudaTextureObject_t texObj, float x, float y, float z);

fetches from the CUDA array specified by the three-dimensional texture object texObj using texture coordinate (x,y,z).

B.8.1.9. tex3DLod()

template<class T>
T tex3DLod(cudaTextureObject_t texObj, float x, float y, float z, float level);

fetches from the CUDA array or the region of linear memory specified by the three-dimensional texture object texObj using texture coordinate (x,y,z) at level-of-detail level.

B.8.1.10. tex3DGrad()

template<class T>
T tex3DGrad(cudaTextureObject_t texObj, float x, float y, float z,
            float4 dx, float4 dy);

fetches from the CUDA array specified by the three-dimensional texture object texObj using texture coordinate (x,y,z) at a level-of-detail derived from the X and Y gradients dx and dy.

B.8.1.11. tex1DLayered()

template<class T>
T tex1DLayered(cudaTextureObject_t texObj, float x, int layer);

fetches from the CUDA array specified by the one-dimensional texture object texObj using texture coordinate x and index layer, as described in Layered Textures

B.8.1.12. tex1DLayeredLod()

template<class T>
T tex1DLayeredLod(cudaTextureObject_t texObj, float x, int layer, float level);

fetches from the CUDA array specified by the one-dimensional layered texture at layer layer using texture coordinate x and level-of-detail level.

B.8.1.13. tex1DLayeredGrad()

template<class T>
T tex1DLayeredGrad(cudaTextureObject_t texObj, float x, int layer,                   float dx, float dy);

fetches from the CUDA array specified by the one-dimensional layered texture at layer layer using texture coordinate x and a level-of-detail derived from the dx and dy gradients.

B.8.1.14. tex2DLayered()

template<class T>
T tex2DLayered(cudaTextureObject_t texObj,               
        float x, float y, int layer);

fetches from the CUDA array specified by the two-dimensional texture object texObj using texture coordinate (x,y) and index layer, as described in Layered Textures.

B.8.1.15. tex2DLayeredLod()

template<class T>
T tex2DLayeredLod(cudaTextureObject_t texObj, float x, float y, int layer,                  float level);

fetches from the CUDA array specified by the two-dimensional layered texture at layer layer using texture coordinate (x,y).

B.8.1.16. tex2DLayeredGrad()

template<class T>
T tex2DLayeredGrad(cudaTextureObject_t texObj, float x, float y, int layer,
                   float2 dx, float2 dy);

fetches from the CUDA array specified by the two-dimensional layered texture at layer layer using texture coordinate (x,y) and a level-of-detail derived from the dx and dy X and Y gradients.

B.8.1.17. texCubemap()

template<class T>
T texCubemap(cudaTextureObject_t texObj, float x, float y, float z);

fetches the CUDA array specified by the three-dimensional texture object texObj using texture coordinate (x,y,z), as described in Cubemap Textures.

B.8.1.18. texCubemapLod()

template<class T>
T texCubemapLod(cudaTextureObject_t texObj, float x, float, y, float z,                float level);

fetches from the CUDA array specified by the three-dimensional texture object texObj using texture coordinate (x,y,z) as described in Cubemap Textures. The level-of-detail used is given by level.

B.8.1.19. texCubemapLayered()

template<class T>
T texCubemapLayered(cudaTextureObject_t texObj,                    
                      float x, float y, float z, int layer);

fetches from the CUDA array specified by the cubemap layered texture object texObj using texture coordinates (x,y,z), and index layer, as described in Cubemap Layered Textures.

B.8.1.20. texCubemapLayeredLod()

template<class T>
T texCubemapLayeredLod(cudaTextureObject_t texObj, float x, float y, float z,                       int layer, float level);

fetches from the CUDA array specified by the cubemap layered texture object texObj using texture coordinate (x,y,z) and index layer, as described in Cubemap Layered Textures, at level-of-detail level level.

B.8.1.21. tex2Dgather()

template<class T>
T tex2Dgather(cudaTextureObject_t texObj,              
               float x, float y, int comp = 0);

fetches from the CUDA array specified by the 2D texture object texObj using texture coordinates x and y and the comp parameter as described in Texture Gather.

本文备注/经验分享：

今天这章节比较简单, 主要是在device端(也就是kernel代码里)所能使用的纹理读取(识取)函数.还记得纹理么. 之前的章节介绍过好多.

我先把Texture Object API部分放出来，等明天把Texture Reference API部分放出来，我再一起讲。

有不明白的地方，请在本文后留言

或者在我们的技术论坛bbs.gpuworld.cn上发帖