[Wayland-bugs] [Bug 67541] [bug] Black screen running Weston master with mesa master

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67541

--- Comment #4 from Pekka Paalanen <ppaalanen at gmail.com> ---
I see what happened.

Weston's GL renderer used to have an #ifdef GL_UNPACK_ROW_LENGTH check to check
the availability of the GL_EXT_unpack_subimage extension in the GLES2 headers. 

The said Mesa commit renamed GL_UNPACK_ROW_LENGTH to GL_UNPACK_ROW_LENGTH_EXT.

That caused the Weston build to think that GL_EXT_unpack_subimage is not
available at build time, so it never compiled that code at all. However, the
runtime check for GL_EXT_unpack_subimage in the GL extension string was not
protected with an #ifdef, and when Weston ran, it found the extension.

The end result is, that gl_renderer_flush_damage() did not do a plain
glTexImage2D because GL_EXT_unpack_subimage was available, and it did not try
glTexSubImage2D either because the code was not compiled. So it never uploaded
the texture.

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