Module texture 

GPU textures.

A GPU texture is an object that can be perceived as an array on the GPU. It holds several items and is a dimensional object. Textures are often associated with images, even though their usage in the graphics world can be much larger than that.

Textures (Texture) come in several flavors and the differences lie in:

• The dimensionality: textures can be 1D, 2D, 3D, layered, cube maps, etc. Dimension is encoded via the Dim type, and indexed in the type-system with the Dimensionable and its implementors.
• The encoding: the items inside textures are called pixels or texels. Those can be encoded in several ways. They are represented by various types, which are implementors of the Pixel trait.
• The usage: some textures will be used as images, others will be used to pass arbitrary data around in shaders, etc.

Whatever the flavor, textures have few uses outside of shaders. When a shader wants to use a texture, it can do it directly, by accessing each pixel by their position inside the texture (using a normalized coordinates system) or via the use of a Sampler. A Sampler, as the name implies, is an object that tells the GPU how fetching (sampling) a texture should occur. Several options there too:

• The GPU can fetch a pixel without sampling. It means that you have to pass the exact coordinates of the pixel you want to access. This is useful when you store arbitrary information, like UUID, velocities, etc.
• The GPU can fetch a pixel with a floating-point coordinates system. How that system works depends on the settings of Sampler you choose. For instance, you can always fetch the nearest pixel to where you sample, or you can ask the GPU to perform a linear interpolation between all neighboring pixels, etc. Sampler allows way more than that, so feel free to read their documentation.

Structs

Cubemap

Cubemap dimension.

Dim1

1D dimension.

Dim2

2D dimension.

Dim3

3D dimension.

Dim1Array

1D array dimension.

Dim2Array

2D dimension.

Sampler

A Sampler object gives hint on how a Texture should be sampled.

Texture

Textures.

Enums

CubeFace

Faces of a cubemap.

Dim

Dimension of a texture.

MagFilter

Magnification filter.

MinFilter

Minification filter.

TexelUpload

Texel upload.

TextureError

Errors that might happen when working with textures.

Wrap

How to wrap texture coordinates while sampling textures?

Traits

Dimensionable

Class of Texture dimensions.