[Webkit-unassigned] [Bug 241728] WebGL Internal error compiling shader with Metal backend.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=241728

--- Comment #3 from Christopher Dyken <cdyk-bugzilla at protonmail.com> ---
It looks like the failure is tied to fetching the true-expression from a uniform block:

Putting more data into MaterialParameter still fails to link:
----------------------------------------
#version 300 es 
precision highp float; 
uniform MaterialParameters { 
  vec4 bar;
  float specularPower;
  float baz;
}; 
layout(location=0) out vec4 fragColor; 
void main() 
{ 
  fragColor = vec4(specularPower != 0.0 ? specularPower : 80.0,
                   bar.xy,
                   baz); 
}
----------------------------------------


Moving specularPower out of the block into a single uniform links successfully:
----------------------------------------
#version 300 es 
precision highp float; 
uniform MaterialParameters { 
  vec4 bar;
  float baz;
}; 
uniform float specularPower;
layout(location=0) out vec4 fragColor; 
void main() 
{ 
  fragColor = vec4(specularPower != 0.0 ? specularPower : 80.0,
                   bar.xy,
                   baz); 
}
----------------------------------------


Adding a float-cast to the true-expression links successfully:
----------------------------------------
#version 300 es 
precision highp float; 
uniform MaterialParameters { 
  float specularPower; 
}; 
layout(location=0) out vec4 fragColor; 
void main() 
{ 
  fragColor = vec4(specularPower != 0.0 ? float(specularPower) : 80.0); 
}
----------------------------------------


Fetching from the false-expression links successfully:
----------------------------------------
#version 300 es 
precision highp float; 
uniform MaterialParameters { 
  float specularPower; 
}; 
layout(location=0) out vec4 fragColor; 
void main() 
{ 
  fragColor = vec4(specularPower == 0.0 ? 80.0 : specularPower); 
}

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