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Does anyone know if GL_TEXTURE_RECTANGLE is supported in OpenGL ES? I am planning to use it for 2D graphics to support non-power-of-two images. My current implementation uses POT textures with alpha=0 padding is not doing well with stretched images. It is for OpenGL but we have plans of porting it to OpenGL ES as well.
There used to be
http://www.opengl.org/registry/specs/ARB/texture_non_power_of_two.txt
which allows you to use non-power-of-two textures as a normal GL_TEXTURE_2D target.
No need to use GL_TEXTURE_RECTANGLE.
This has been incorporated into OpenGL 2.0:
See page 341 http://www.opengl.org/documentation/specs/version2.0/glspec20.pdf
And I believe it also should just work in OpenGL ES:
See page 83 http://www.khronos.org/registry/gles/specs/2.0/es_full_spec_2.0.25.pdf