[OpenJDK 2D-Dev] [8] request for review: 8016254 several sun/java2d/OpenGL tests failed with SIGFPE

[Vadim Pakhnushev]

Hi,

Please review the fix for 8016254:
http://bugs.sun.com/view_bug.do?bug_id=8016254
https://jbs.oracle.com/bugs/browse/JDK-8016254
http://cr.openjdk.java.net/~vadim/8016254/webrev.00/

The problem is that Intel 865G chipset (and some other ancient video 
cards) doesn't support GL_ARB_depth_texture extension, although does 
support GL_EXT_framebuffer_object.
So the OGLContext_IsFBObjectExtensionAvailable function calls 
OGLSD_InitFBObject which tries to create a depth renderbuffer.
Ideally glRenderbufferStorageEXT should return GL_INVALID_ENUM to 
indicate that the format is not supported, but instead it passes 
incorrect values further to the driver and MESA driver crashes.
The proposed fix is to check GL_ARB_depth_texture extension and return 
false from OGLContext_IsFBObjectExtensionAvailable if it's not supported.

Thanks,
Vadim