Re: [PATCH] wined3d: Don't discard buffer data if buffer is not bound.

[Stefan Dösinger]

> Am 08.07.2020 um 22:44 schrieb Paul Gofman :
> - hr = IDirect3DVertexBuffer9_Lock(buffer, 0, size, (void **)&quads, 0);
> - ok(hr == D3D_OK, "Got unexpected hr %#x.\n", hr);
> -
> - /* The data has been reset for the whole buffer. */
> - for (i = 0; i < quad_count - 1; ++i)
> -
>    ok(memcmp(&quads[i], &quad1, sizeof(quad1)), "Quads match, i %u.\n", i);
> -
> - ok(!memcmp(&quads[i], &quad2, sizeof(quad2)), "Quads do not match, i %u.\n", i);
> -
> - for (i = 0; i < quad_count; ++i)
> -
>    quads[i] = quad1;
> -
> - hr = IDirect3DVertexBuffer9_Unlock(buffer);
> - ok(hr == D3D_OK, "Got unexpected hr %#x.\n", hr);
> -
> - hr = IDirect3DDevice9_SetStreamSource(device, 0, buffer2, 0, sizeof(*quads->strip));
> - ok(hr == D3D_OK, "Got unexpected hr %#x.\n", hr);

What happens if you draw something from 'buffer' between the Unlock and SetStreamSource? See test_vb_discard() in ddraw7.c, although I think Henri ported the test to d3d8/9 at some point. I couldn't find it on a quick search though.

What happens if you bind the a to a stream that is not used by the vertex declaration?