[v2 2/2] d3d11/tests: Add test for primitive restart index.

[Henri Verbeet]

Józef pointed out a couple of issues in the other patches that also
apply here. I won't repeat those.

On 18 November 2016 at 04:45, Andrew Wesie <awesie at gmail.com> wrote:
> +    static const struct vec2 vertices[] =
> +    {
> +        { -1.0f, -1.0f },
> +        { -1.0f,  1.0f },
> +        { 1.0f, -1.0f },
> +        { 1.0f,  1.0f },
> +        { -1.0f, -1.0f },
> +        { -1.0f,  1.0f },
> +        { 1.0f, -1.0f },
> +        { 1.0f,  1.0f },
> +    };
This works, but for primitive restart in particular it may be more
useful to not draw these overlapping and instead use e.g. {-1.0f,
-0.25f, 0.25f, 1.0f} for the x-coordinates.

> +    static const unsigned int indices[] =
> +    {
> +        0, 1, 2, 3, 0xFFFFFFFF, 4, 5, 6, 7
> +    };
We use lowercase hexadecimal constants.

> +    hr = ID3D11Device_CreateInputLayout(device, layout_desc,
> +        sizeof(layout_desc) / sizeof(*layout_desc),
> +        vs_code, sizeof(vs_code), &test_context.input_layout);
I realise test_cb_relative_addressing() in particular uses
test_context's input_layout field in a similar way, but it doesn't
strike me as something we'd want to encourage. Likewise for the "vs"
and "vb" fields. We use double indentation for line continuations.

> +    expected_color = 0xff0000ff;
> +    ID3D11DeviceContext_IASetIndexBuffer(test_context.immediate_context, ib, DXGI_FORMAT_R32_UINT, 0);
> +    ID3D11DeviceContext_DrawIndexed(test_context.immediate_context, 9, 0, 0);
> +    check_texture_color(test_context.backbuffer, expected_color, 0);
> +
> +    ID3D11DeviceContext_IASetIndexBuffer(test_context.immediate_context, ib16, DXGI_FORMAT_R16_UINT, 0);
> +    ID3D11DeviceContext_DrawIndexed(test_context.immediate_context, 9, 0, 0);
> +    check_texture_color(test_context.backbuffer, expected_color, 0);
The "expected_color" variable seems unnecessary here.