Moved lib_base Metal support into patches/ for portability.

patches/lib_base_metal.patch

@@ -0,0 +1,68 @@
+diff --git a/base/platform/base_platform_info.h b/base/platform/base_platform_info.h
+index 7b29721..261ee24 100644
+--- a/base/platform/base_platform_info.h
++++ b/base/platform/base_platform_info.h
+@@ -60,6 +60,7 @@ enum class OutdateReason {
+ [[nodiscard]] bool IsMac10_15OrGreater();
+ [[nodiscard]] bool IsMac11_0OrGreater();
+ [[nodiscard]] bool IsMac26_0OrGreater();
++[[nodiscard]] bool MetalSupported();
+ 
+ [[nodiscard]] constexpr bool IsLinux();
+ [[nodiscard]] bool IsX11();
+diff --git a/base/platform/linux/base_info_linux.h b/base/platform/linux/base_info_linux.h
+index 80c3d65..aa28bf1 100644
+--- a/base/platform/linux/base_info_linux.h
++++ b/base/platform/linux/base_info_linux.h
+@@ -36,5 +36,6 @@ inline bool IsMac10_14OrGreater() { return false; }
+ inline bool IsMac10_15OrGreater() { return false; }
+ inline bool IsMac11_0OrGreater() { return false; }
+ inline bool IsMac26_0OrGreater() { return false; }
++inline bool MetalSupported() { return false; }
+ 
+ } // namespace Platform
+diff --git a/base/platform/mac/base_info_mac.mm b/base/platform/mac/base_info_mac.mm
+index 53fbfe2..47a89de 100644
+--- a/base/platform/mac/base_info_mac.mm
++++ b/base/platform/mac/base_info_mac.mm
+@@ -21,6 +21,7 @@
+ #include <QtCore/QOperatingSystemVersion>
+ #include <sys/sysctl.h>
+ #include <Cocoa/Cocoa.h>
++#include <Metal/Metal.h>
+ #import <IOKit/hidsystem/IOHIDLib.h>
+ 
+ @interface WakeUpObserver : NSObject {
+@@ -246,6 +247,20 @@ bool IsMac26_0OrGreater() {
+ 	return IsMacThatOrGreater<26, 0>();
+ }
+ 
++bool MetalSupported() {
++	static const auto result = [] {
++		if (@available(macOS 10.15, *)) {
++			auto device = MTLCreateSystemDefaultDevice();
++			if (device) {
++				[device release];
++				return true;
++			}
++		}
++		return false;
++	}();
++	return result;
++}
++
+ void Start(QJsonObject settings) {
+ 	Expects(GlobalWakeUpObserver == nil);
+ 
+diff --git a/base/platform/win/base_info_win.h b/base/platform/win/base_info_win.h
+index 0ec8688..4f5c0ff 100644
+--- a/base/platform/win/base_info_win.h
++++ b/base/platform/win/base_info_win.h
+@@ -58,6 +58,7 @@ inline bool IsMac10_14OrGreater() { return false; }
+ inline bool IsMac10_15OrGreater() { return false; }
+ inline bool IsMac11_0OrGreater() { return false; }
+ inline bool IsMac26_0OrGreater() { return false; }
++inline bool MetalSupported() { return false; }
+ inline constexpr bool IsLinux() { return false; }
+ inline bool IsX11() { return false; }
+ inline bool IsWayland() { return false; }