OpenGameArt.org is a community that brings like-minded coders and artists together for the purpose of creating Open Source video games, by providing a human-edited, searchable database of freely-licened art resources.

SpriteLib GPL a collection of static and animated graphic objects (also commonly known as sprites). It was created to provide hobbyist game developers with an assortment of images to use in their creations. Because of SpriteLib GPL, developers don't have to waste precious time or money creating graphics from scratch.

Sparse Virtual Texturing is an approach to simulating very large textures using much less texture memory than they'd require in full by downloading only the data that is needed, and using a pixel shader to map from the virtual large texture to the actual physical texture. The technique could be used for very large textures, or simply for large quantities of smaller textures (by packing them into the large texture, or by using multiple page tables). It was mostly inspired by John Carmack's descriptions of MegaTexturing in several public and private forums and emails. It may not be exactly the same as MegaTexture, but it's probably close.

Cube maps are typically used to create reflections from an environment that is considered to be infinitely far away. But with a small amount of shader math, we can place objects inside a reflection environment of a specific size and location, providing higher quality, image-based lighting (IBL).

This is a plugin for GIMP version 2.4.x. It allows you to load and save images in DirectDraw Surface (DDS) format.

Sample DDS file loader

The Microsoft DirectDraw Surface (DDS) file format is used to store textures and cubic environment maps, both with and without mipmap levels. This format can store uncompressed and compressed pixel formats, and is the preferred file format for storing DXTn compressed data

This SBRDF site contains a repository of sampled SBRDF data that you can download and experiment with. It also contains sample code for creating SBRDFs from input photographs, and rendering code and shaders for SBRDF surfaces. The Content section has instructional images, result images, etc. The Papers section has pointers to research papers related to SBRDFs.