[cairo] [patch] gl - use direct mode for uploading gradient texture

[Chris Wilson]

On Tue, 20 Mar 2012 00:32:01 +0000, "Henry (Yu) Song - SISA" <hsong at sisa.samsung.com> wrote:
> Using pbo to upload gradient fails on ATI/fglrx driver (latest 12.2).  glGetError () after glTexSubImage2D() always returns GL_INVALID_OPERATION.  Not sure why, might be fglrx bug.  PBO works for other drivers.
> To make it work in ATI/flgrlx, I have attached the following patch.  Figured that since gradient is small, non-pbo performance hit should be minimal.  If you think that cairo should keep pbo and let fglrx fails until they fix bugs.  I am fine with that.

Using a pbo is not going to be performance critical, so lets just drop
it in order to have simpler code.

I amended your patch to improve the error handling and pushed, thanks.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre