renderMetal: device/vendor name and API version

src/gui/render/renderMetal.mm

@@ -185,6 +185,30 @@ int FurnaceGUIRenderMetal::getWindowFlags() {
   return 0;
 }
 
+int FurnaceGUIRenderMetal::getMaxTextureWidth() {
+  return bigTextures?16384:8192;
+}
+
+int FurnaceGUIRenderMetal::getMaxTextureHeight() {
+  return bigTextures?16384:8192;
+}
+
+const char* FurnaceGUIRenderMetal::getBackendName() {
+  return "Metal";
+}
+
+const char* FurnaceGUIRenderMetal::getVendorName() {
+  return vendorName.c_str();
+}
+
+const char* FurnaceGUIRenderMetal::getDeviceName() {
+  return deviceName.c_str();
+}
+
+const char* FurnaceGUIRenderMetal::getAPIVersion() {
+  return apiVersion.c_str();
+}
+
 void FurnaceGUIRenderMetal::setSwapInterval(int swapInterval) {
   if (SDL_RenderSetVSync(sdlRend,(swapInterval>=0)?1:0)!=0) {
     swapIntervalSet=false;
@@ -199,6 +223,33 @@ void FurnaceGUIRenderMetal::preInit() {
   priv=new FurnaceGUIRenderMetalPrivate;
 }
 
+static const char* metalFamilyNames[]={
+  "Apple1",
+  "Apple2",
+  "Apple3",
+  "Apple4",
+  "Apple5",
+  "Apple6",
+  "Apple7",
+  "Apple8",
+  "Apple9",
+  "Mac1",
+  "Mac2",
+  "Common1",
+  "Common2",
+  "Common3",
+  "Metal3",
+  NULL
+};
+
+static const NSInteger metalFamilies[]={
+  1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008, 1009, // Apple
+  2001, 2002, // Mac
+  3001, 3002, 3003, // Common
+  5001, // Metal3
+  0
+};
+
 bool FurnaceGUIRenderMetal::init(SDL_Window* win, int swapInterval) {
   SDL_SetHint(SDL_HINT_RENDER_DRIVER,"metal");
 
@@ -222,6 +273,24 @@ bool FurnaceGUIRenderMetal::init(SDL_Window* win, int swapInterval) {
     return false;
   }
 
+  vendorName=[priv->context.device.architecture.name UTF8String];
+  deviceName=[priv->context.device.name UTF8String];
+  apiVersion="";
+
+  bool comma=false;
+  for (int i=0; metalFamilies[i]; i++) {
+    const char* familyName=metalFamilyNames[i];
+    MTLGPUFamily family=(MTLGPUFamily)metalFamilies[i];
+
+    if ([priv->context.device supportsFamily:family]) {
+      if (comma) {
+        apiVersion+=", ";
+      }
+      apiVersion+=familyName;
+      comma=true;
+    }
+  }
+
   priv->context.pixelFormat=MTLPixelFormatBGRA8Unorm;
 
   priv->cmdQueue=[priv->context.device newCommandQueue];