MGRAS texture corruption

    Bug Number           : 758216
    Product              : Graphics
    IRIX Release         : 6.5.3m
    Category             : software
    Classification       : bug
    Priority             : 1
    Status               : open
    Date Opened          : 07/12/99
    Date Updated         : 11/11/99
    Summary              : MGRAS texture corruption

    Description          :

    A multiprocess application renders fonts and graphics in real-time.
The application is separated into 2 processes: a screen painter, whose
primary
    responsibility is to draw polygons with textures; and a Region
Manager, who reads in data and rasterizes textures. The texture data is
passed between the
    two processes using shared memory, and communication between the
processes is through uspsema and usvsema.

    Since upgrading Octane system to IRIX 6.5 from IRIX 6.4, the texture
created in the region manager and bound into texture memory by the
screen painter
    gets corrupted. Sometimes the texture is lost, other times it
appears to be pieces of textures previously painted.

    The identical source code compiled for IRIX 6.2 works fine, but when
compiled for IRIX 6.5.2 or 6.5.3 fails. An executable compiled under
IRIX 6.2 runs
    on IRIX 6.2 with no problems, but when transferred to a IRIX 6.5.3
machine, fails. In addition, the identical source code compiled for IRIX
6.5.2 on an O2
    works fine.