[Mac] Minor fixes on Mac platform.

- Don't make NSWindow initially visibile if it's not explcitily shown.
- Clamp GL context sample count to 1 if a default context is created.

sources/Platform/MacOS/MacOSWindow.mm

@@ -439,17 +439,22 @@ static void SetRelativeNSWindowPosition(NSWindow* wnd, const Offset2D& position,
     #endif
 
     const bool isCentered = ((desc.flags & WindowFlags::Centered) != 0);
+    const bool isVisible = ((desc.flags & WindowFlags::Visible) != 0);
+
+    /* Make this the new key window but only put it into the front if it's initially visible */
+    if (isVisible)
+        [wnd makeKeyAndOrderFront:nil];
+    else
+        [wnd makeKeyWindow];
 
     /* Move this window to the front of the screen list and center if requested */
-    [wnd makeKeyAndOrderFront:nil];
     if (isCentered)
         [wnd center];
     else
         SetRelativeNSWindowPosition(wnd, desc.position);
 
-    /* Show window */
-    if ((desc.flags & WindowFlags::Visible) != 0)
-        [wnd setIsVisible:YES];
+    /* Show or hide window */
+    [wnd setIsVisible:(isVisible ? YES : NO)];
 
     return wnd;
 }

sources/Renderer/Metal/Shader/MTShader.mm

@@ -147,7 +147,7 @@ static MTLLanguageVersion GetMTLLanguageVersion(const ShaderDescriptor& desc)
     return opt;
 }
 
-bool MTShader::CompileFromDefaultLibrary(id<MTLDevice> device, const ShaderDescriptor &shaderDesc)
+bool MTShader::CompileFromDefaultLibrary(id<MTLDevice> device, const ShaderDescriptor& shaderDesc)
 {
     library_ = [device newDefaultLibrary];
     return LoadShaderFunction(shaderDesc.entryPoint);

sources/Renderer/OpenGL/Platform/MacOS/MacOSGLContext.mm

@@ -130,7 +130,7 @@ static NSOpenGLPixelFormatAttribute TranslateNSOpenGLProfile(const RendererConfi
     const NSOpenGLPixelFormatAttribute profileAttrib = TranslateNSOpenGLProfile(profile);
 
     /* Find suitable pixel format (for samples > 0) */
-    for (samples_ = pixelFormat.samples; samples_ > 0; --samples_)
+    for (samples_ = std::max<int>(1, pixelFormat.samples); samples_ > 0; --samples_)
     {
         NSOpenGLPixelFormatAttribute attribs[] =
         {