Orphan Object (Bill)

1
Orphan Object (Bill)

• Current texture object behavior
• Bind ID in context 1
• Bind same ID in context 2 and start rendering
  against it
• Delete object in context 1.
• Object un-bound from all texture stages ONLY in
  context 1.
• Object is deleted once no longer bound in any
  context.
• After deletion name will be marked as available.
• In single context case, delete will un-bind,
  refcount goes to zero, therefore is deleted.

2
Orphan Object (Pat)

• Current texture object behavior
• Bind ID in context 1
• Bind same ID in context 2 and start rendering
  against it
• Delete object in context 1.
• Object un-bound from all texture stages ONLY in
  context 1.
• Object ID no longer exists. Therefore same ID is
  available to create a new object.
• Old object is deleted once no longer bound in any
  context. (But cannot be referenced by ID anymore)
• In single context case, delete will un-bind,
  refcount goes to zero, therefore is deleted.

3
GLX 1.3 spec

• The results of changing a texture object while
  another context is using it are undefined.
• All modifications to shared context state as a
  result of executing glBindTexture are atomic.
  Also, a texture object will not be deleted until
  it is no longer bound to any rendering context.
• In general, OpenGL commands are not guaranteed to
  be atomic. The operation of glEndList and
  glDeleteLists are exceptions modifications to
  the shared context state as a result of executing
  glEndList or glDeleteLists are atomic.