Hi, I'm displaying linear gray by CAMetalLayer with the shader below.
fragment float4 fragmentShader(VertexOut in [[stage_in]],
texture2d<float, access::sample> BGRATexture [[ texture(0) ]])
{
float color = in.texCoordinates.x;
return float4(float3(color), 1.0);
}
And my CAMetalLayer has been set to linearSRGB.
metalLayer.colorspace = CGColorSpace(name: CGColorSpace.linearSRGB)
metalLayer.pixelFormat = .bgra8Unorm
Why the display seem add gamma? Apparently the middle gray is 187 but not 128.