[Webkit-unassigned] [Bug 205756] REGRESSION: [ Mac ] webgl/2.0.0/conformance2/glsl3/no-attribute-vertex-shader.html is failing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205756

--- Comment #4 from Dean Jackson <dino at apple.com> ---
You can test this if you change the vertex shader code to:

if (gl_VertexID == 0) {
    gl_Position = vec4(-1., 1., 0, 1);
} else if (gl_VertexID == 1) {
    gl_Position = vec4(-1., -1., 0, 1);
} else if (gl_VertexID == 2) {
    gl_Position = vec4(1., -1., 0, 1);
} else {
    gl_Position = vec4(-1, 1, 0, 1);
}

That should give you a single green triangle.

Change the else value to vec4(0), and you should still get a triangle, but you don't on some mac hardware.

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