https://bugs.freedesktop.org/show_bug.cgi?id=105273
--- Comment #6 from erhard_f@mailbox.org --- Tried a Radeon HD 6450 on my PCIe PowerMac G5 11,2 for another comparison. Graphics are rendered correctly! So it seems this bug is a specific r300 driver problem, not a generic Big Endian problem.
$ glxinfo | grep -i opengl OpenGL vendor string: X.Org OpenGL renderer string: AMD CAICOS (DRM 2.49.0 / 4.9.85-gentoo) OpenGL core profile version string: 3.2 (Core Profile) Mesa 18.0.0-rc4 OpenGL core profile shading language version string: 1.50 OpenGL core profile context flags: (none) OpenGL core profile profile mask: core profile OpenGL core profile extensions: OpenGL version string: 3.0 Mesa 18.0.0-rc4 OpenGL shading language version string: 1.30 OpenGL context flags: (none) OpenGL extensions: OpenGL ES profile version string: OpenGL ES 3.1 Mesa 18.0.0-rc4 OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.10 OpenGL ES profile extensions: