Comment # 9 on bug 59322 from Stefan Dösinger

(In reply to comment #8)
> Is it a big deal that ARB_framebuffer_sRGB is unsupported? In such a case,
> the renderbuffer format GL_SRGB8_ALPHA8 is equivalent to GL_RGBA8.
Not really. In this case we generate code in the pixel shader that performs
sRGB color conversion as specified in the framebuffer_sRGB spec.

Do r300-r500 GPUs have some dedicated silicon to handle sRGB conversion? If so,
it'd be nice to use it.