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renderer: also enable floating-point readback with extension

Erik Faye-Lund requested to merge kusma/virglrenderer:avoid-softpipe-asserts into master

The GL_EXT_color_buffer_float exptension spec defines that glReadPixels can be done with the combination of GL_RGBA and GL_FLOAT, which matches what OpenGL ES 3.2 allows. So let's enable the readback-format in this case.

Thanks to Gert Wollny for pointing this out.

Signed-off-by: Erik Faye-Lund erik.faye-lund@collabora.com

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