OpenGL.GL.NV.texture_rectangle

OpenGL extension NV.texture_rectangle

This module customises the behaviour of the OpenGL.raw.GL.NV.texture_rectangle to provide a more Python-friendly API

Overview (from the spec)

OpenGL texturing is limited to images with power-of-two dimensions and an optional 1-texel border. NV_texture_rectangle extension adds a new texture target that supports 2D textures without requiring power-of-two dimensions.

Non-power-of-two dimensioned textures are useful for storing video images that do not have power-of-two dimensions. Re-sampling artifacts are avoided and less texture memory may be required by using non-power-of-two dimensioned textures. Non-power-of-two dimensioned textures are also useful for shadow maps and window-space texturing.

However, non-power-of-two dimensioned (NPOTD) textures have limitations that do not apply to power-of-two dimensioned (POT) textures. NPOTD textures may not use mipmap filtering; POTD textures support both mipmapped and non-mipmapped filtering. NPOTD textures support only the GL_CLAMP, GL_CLAMP_TO_EDGE, and GL_CLAMP_TO_BORDER_ARB wrap modes; POTD textures support GL_CLAMP_TO_EDGE, GL_REPEAT, GL_CLAMP, GL_MIRRORED_REPEAT_IBM, and GL_CLAMP_TO_BORDER. NPOTD textures do not support an optional 1-texel border; POTD textures do support an optional 1-texel border.

NPOTD textures are accessed by non-normalized texture coordinates. So instead of thinking of the texture image lying in a the NPOTD texture image lies in a [0..w x[0..h] range.

This extension adds a new texture target and related state (proxy, binding, max texture size).

The official definition of this extension is available here: http://www.opengl.org/registry/specs/NV/texture_rectangle.txt