As soon as you start OpenGL programming, it is essential to be able to use quality textures.
Mipmapping, variable opacity, anti-aliasing are all techniques used to produce professional quality 3D renderings.
GDImage supports all of these techniques to produce textures of any size, from the following image formats:
tga, dds, bmp, tif, tiff, dib, gif, ico, jpg, jpeg, png.

The 64-bit "GLImage" project, compatible with WINDEV 17 to 26, shows how to create textures from images using Explorer's drag and drop.
The window has 2 textures, one for the fixed background and the other opaque or using variable opacity which can be manipulated with the mouse.