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Commit 92a375ab4 changed the initial value of max_texcoord_attrib_unit to -1 so that it could disable the texture coord array for the first texture unit when there are no texture coords used in the vbo. However max_texcoord_attrib_unit was an unsigned value so this actually became G_MAXUINT. The disabling loop at the bottom still worked because G_MAXUINT+1==0 but the check for whether any texture unit is greater than max_texcoord_attrib_unit was failing so it would always end up disabling all texture units. This is now fixed by changing max_texcoord_attrib_unit to be signed.