bgfx/3rdparty/glsl-optimizer/tests/fragment/prec-expressions-inES3.txt

#version 300 es
out lowp vec4 _fragData;

uniform mediump mat4 _LightMatrix;
uniform highp vec3 _WorldPos;

void main()
{
    // Used to expose bug in Metal output where it was inserting cast in the wrong place,
    // i.e. it was doing a v3 = (float4)(mat * vec).xyz
    mediump vec3 lightCoord = vec3 ( (_LightMatrix * vec4(_WorldPos, 1.0)) );

    mediump vec4 r;
    r.xyz = lightCoord;
    r.w = 1.0;
    _fragData = r;
}