Hello,
Several VTK tests have been failing when using depth peeling with the
nightly mesa development tree. The tests die with an assertion failure
inside mesa:
main/context.c:632: delete_shader_cb: Assertion `shProg->Type == 0x9999'
failed.
I think the problem is in shader/shader_api.c in the function
_mesa_delete_shader:
sh->DeletePending = GL_TRUE;
sh->RefCount--;
if (sh->RefCount <= 0) {
_mesa_free_shader(ctx, sh);
}
This deletes the shader object when the reference count reaches zero.
However this fails to remove the ctx->Shared->ShaderObjects hash table
entry for the shader. Later when the gl context is destroyed the line
_mesa_HashDeleteAll(ss->ShaderObjects, delete_shader_cb, ctx);
in main/context.c causes all hash table entry objects to be deleted.
This attempts to delete the shader object again. Since the memory has
been re-used the assertion fails of course. I fixed the problem in my
own mesa checkout by adding the line:
_mesa_HashRemove(ctx->Shared->ShaderObjects, shader);
just after the _mesa_free_shader call above. I'm not sure that is quite
the right place for it but hopefully a mesa dev can take it from here.
Thanks,
-Brad
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