GSoC-2011: Implement Missing Mesh Functions in Wine’s D3DX9
stefandoesinger at gmx.at
Tue Jun 14 06:43:55 CDT 2011
On Tuesday 14 June 2011 12:57:35 Michael Mc Donnell wrote:
> I cache the vertex declaration (D3DVERTEXELEMENT9 array) and the size
> of the vertex declaration, so that they can be used by
> GetNumBytesPerVertex and GetDeclaration when an invalid declaration
> has been passed.
> + memcpy(declaration, This->cached_declaration, sizeof(This-
You should probably test if native really writes the full MAX_FVF_DECL_SIZE
declaration elements, or only up to the D3DDECL_END() marker in the real
declaration. A similar consideration applies to UpdateSemantics, but that is
harder to test. E.g.:
+ D3DVERTEXELEMENT9 declaration[MAX_FVF_DECL_SIZE];
+ D3DVERTEXELEMENT9 declaration0 =
memset(declaration, 0xaa, sizeof(declaration));
memcpy(declaration, declaration0, sizeof(declaration0));
memset(declaration, 0xbb, sizeof(declaration));
Now look at the bytes in 'declaration' after the D3DDECL_END() marker up to
the end of the array. They could be 0xaa(UpdateSemantics reads everything,
GetDeclaration writes everything), 0xbb(UpdateSemantics is unknown,
GetDeclaration writes only the defined part), or something else(e.g.
UpdateSemantics and/or GetDeclaration clear set the extra bytes to 0).
In the way your implementation and tests are currently set up UpdateSemantics
will read undefined memory because your test declarations like declaration0
don't have the full MAX_FVF_DECL_SIZE array size. Otoh I am not quite sure
about the semantics of passing an array on the stack like this. Maybe the
compiler allocates a new array with the full size and copies the content
I have to say though that the way the API is defined is a bit odd. But I
checked it, and UpdateSemantics and GetDeclaration are defined in this way in
the DirectX SDK headers.
Also I think this method has been pretty thoroughly tested and debated by now.
If we implement all the functions this way we'd probably be pretty bug-free
Also, there's the obligatory style nitpick:
> + IDirect3DDevice9 *device;
> +static struct test_context* new_test_context(void)
For consistency this should probably be static struct test_context
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