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

[bugzilla-daemon at webkit.org]

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

            Bug ID: 241728
           Summary: WebGL Internal error compiling shader with Metal
                    backend.
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cdyk-bugzilla at protonmail.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

On Safari 15 (both MacOs 12 and iOS 15.5), my shaders have started to fail linking with the message "Internal error compiling shader with Metal backend". They work fine on chrome and firefox.

I have reduced one shader to the following repro case (https://jsfiddle.net/cdyk1/12whq53t/11/):

const canvas = document.getElementById("foo");
const gl = canvas.getContext("webgl2")

const vs = gl.createShader(gl.VERTEX_SHADER);
gl.shaderSource(vs, `#version 300 es 
precision highp float; 
in vec3 a_POSITION0; 
void main() 
{ 
  gl_Position = vec4(a_POSITION0, 1.0); 
} 
`);
gl.compileShader(vs);
console.log(gl.getShaderInfoLog(vs));

const fs = gl.createShader(gl.FRAGMENT_SHADER);
gl.shaderSource(fs, `#version 300 es 
precision highp float; 
uniform MaterialParameters { 
  float specularPower; 
}; 

layout(location=0) out vec4 fragColor; 

void main() 
{ 
  fragColor = vec4(specularPower != 0.0 ? specularPower : 80.0); 
} 
`
);
gl.compileShader(fs);
console.log(gl.getShaderInfoLog(fs));

const prog = gl.createProgram();
gl.attachShader(prog, vs);
gl.attachShader(prog, fs);
gl.linkProgram(prog);
console.log(gl.getProgramInfoLog(prog));  // Outputs "Internal error compiling shader with Metal backend."

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