[Webkit-unassigned] [Bug 199215] [WHLSL] Matrix indexing should match HLSL [row][column], but MSL uses [column][row]

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199215

--- Comment #4 from Myles C. Maxfield <mmaxfield at apple.com> ---
(In reply to Myles C. Maxfield from comment #3)
> In Direct3D, if you put [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
> 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32] in a
> buffer, and tell the shader that it's two float4x4s next to each other, then
> you mul(buffer1[0], buffer1[1]) and put the result in another buffer and
> then read the buffer on the CPU side, the results are:
> 
> 538
> 612
> 686
> 760
> 650
> 740
> 830
> 920
> 762
> 868
> 974
> 1080
> 874
> 996
> 1118
> 1240
> 
> Thus, the two matrices are
> [1 5  9 13]   [17 21 25 29]
> [2 6 10 14] * [18 22 26 30]
> [3 7 11 15]   [19 23 27 31]
> [4 8 12 16]   [20 24 28 32]

and buffer1[0][0] is [1 5 9 13]

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