2D Texture differences - jeske/opentk GitHub Wiki

The most commonly used textures are 2-dimensional. There exist 3 kinds of 2D textures:

== Texture2D Power of two sized (POTS) E.g: 1024² These are supported on all OpenGL 1.2 drivers.

• MipMaps are allowed.
• All filter modes are allowed.
• Texture Coordinates are addressed parametrically: [0.0f]x[0.0f]
• All wrap modes are allowed.
• Borders are supported. (Exception: S3TC Texture Compression does not allow borders)

== Texture2D Non power of two sized (NPOTS) E.g: 640*480. GL.SupportsExtension( "ARB_texture_non_power_of_two" ) must evaluate to true.

• MipMaps are allowed.
• All filter modes are allowed.
• Texture Coordinates are addressed parametrically: [0.0f]x[0.0f]
• All wrap modes are allowed.
• Borders are supported. (Exception: S3TC Texture Compression does not allow borders)

== TextureRectangle Arbitrary size. E.g: 640*480. GL.SupportsExtension( "ARB_texture_rectangle" ) must evaluate to true.

• MipMaps are not allowed.
• Only Nearest and Linear filter modes are allowed. (default is Linear)
• Texture Coordinates are addressed non-parametrically: [0..width]x[0..height]
• Only Clamp and ClampToEdge wrap modes are allowed. (default is ClampToEdge)
• Borders are not supported.

Note that 1 and 2 both use the same tokens. The only difference between them is the size.