[cairo] [PATCH] gl: Draw image surface to fbo gl surface using intermediate texture

Eric Anholt eric at anholt.net
Thu Nov 15 22:42:40 PST 2012

Dongyeon Kim <dy5.kim at samsung.com> writes:

> Hello,
> When I create an image surface from png, and use this surface as
> source to paint to cairo gl surface that is created using FBO, the
> resulting gl surface is just black.
> I have spent some time investigating this, and found that cairo was
> uploading data to the texture that is currently being used as target
> framebuffer.
> To fix this problem, image data should be uploaded to an intermediate
> texture, and this texture should be rendered into the FBO.
> The following patch is a suggested fix for both gl-spans and gl-traps
> compositors.

Huh?  Using glTexImage to set the contents of an FBO sounds perfectly
legal and should have expected behavior.  This sounds like a driver bug.

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