Am Dienstag, 28. April 2009 17:25:28 schrieb Henri Verbeet:
2009/4/28 Stefan Dösinger stefan@codeweavers.com:
/* What good are texrect grad functions? I don'tknow, but GL_EXT_gpu_shader4 defines them. + * There is no GL_ARB_shader_texture_lod spec yet, so I don't know if they're defined there + */
So how are you using the extension without a spec?
Google magic. There's a blog entry on the OpenGL page describing the aim of the extension, and there are other pages hinting that the functions work the same way as those in GL_EXT_gpu_shader4, just with an ARB suffix instead of an EXT.
As far as I understand it, the ARB is still arguing about some details of this extension, but ATI and Apple went ahead and shipped the current state of this extension even though there's no formal specification yet.
Obviously this extension is the only way to support texldd on ATI cards, if there was a nicer one with a documented spec I'd prefer over this one.