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Re: Performance hit with GL_TEXTURE_RECTANGLE_EXT & S3TC textures

I looked into this further and spoke to ATI.  We should be generating
an invalid enum in the framework when attempting to use compressed
textures with the rectangle target.  It's not supported in the driver
and is documented as such:

http://developer.apple.com/graphicsimaging/opengl/extensions/ext_texture_rectangle.html:


 *  What is the status of the use of texture compression in
     conjunction with this extension?

     While texture compression is not specifically precluded, certain
     compression schemes are incompatible with rectangular textures thus
     compressed internal textures formats, in general, are not supported
     with this extension.

 - (3.8.3, pg. 129) "Compressed Texture Images"

    

    Add the following paragraph after the second paragraph in the
    section, which introduces the CompressedTexImage<n>DARB commands:

    

    "The error INVALID_ENUM is generated if the target parameter to one
    of the CompressedTexImage<n>DARB commands is TEXTURE_RECTANGLE_EXT."
    Add the following paragraph after introducing the
    CompressedTexSubImage<n>DARB commands: "The error INVALID_ENUM is
    generated if the target parameter to one of the
    CompressedTexSubImage<n>DARB commands is TEXTURE_RECTANGLE_EXT."


Did you check the glError() state after making the call to glCompressTexImage2D ?

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References: 
 >Re: Performance hit with GL_TEXTURE_RECTANGLE_EXT & S3TC textures (From: Jonathan del Strother <email@hidden>)
 >Re: Performance hit with GL_TEXTURE_RECTANGLE_EXT & S3TC textures (From: John Rosasco <email@hidden>)
 >Re: Performance hit with GL_TEXTURE_RECTANGLE_EXT & S3TC textures (From: Jonathan del Strother <email@hidden>)



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