Add metal demo (#38)

* Add metal demo

* Remove Vulkan import

Demos/CPUBackendDemoApp/main.swift

@@ -1,10 +1,3 @@
-//
-// main.swift
-// Fireblade PAL
-//
-// Copyright © 2018-2023 Fireblade Team. All rights reserved.
-// Licensed under MIT License. See LICENSE file for details.
-
 import FirebladePAL
 
 Platform.initialize()

Demos/MetalBackendDemoApp/main.swift

@@ -0,0 +1,39 @@
+#if FRB_GRAPHICS_METAL
+
+    import FirebladePAL
+    import Metal
+
+    Platform.initialize()
+    print("Platform version: \(Platform.version)")
+
+    func makeMTLSurface(in window: Window) throws -> MTLWindowSurface {
+        let surface = try MTLWindowSurface(in: window, device: MTLCreateSystemDefaultDevice())
+        surface.mtlLayer?.backgroundColor = .init(red: 1.0, green: 0.0, blue: 1.0, alpha: 1.0)
+        return surface
+    }
+
+    let props = WindowProperties(title: "Metal Window", frame: .init(0, 0, 800, 600))
+
+    let window = try Window(properties: props,
+                            surface: makeMTLSurface)
+
+    var event = Event()
+    var quit = false
+
+    while !quit {
+        Events.pumpEvents()
+
+        while Events.pollEvent(&event) {
+            switch event.variant {
+            case .userQuit:
+                quit = true
+
+            default:
+                break
+            }
+        }
+    }
+
+    Platform.quit()
+
+#endif

Demos/VulkanBackendDemoApp/main.swift

@@ -1,10 +1,3 @@
-//
-// main.swift
-// Fireblade PAL
-//
-// Copyright © 2018-2023 Fireblade Team. All rights reserved.
-// Licensed under MIT License. See LICENSE file for details.
-
 #if FRB_GRAPHICS_VULKAN
 
     import FirebladePAL
@@ -17,7 +10,7 @@
         return try VLKWindowSurface(in: window, instance: vulkanInstance)
     }
 
-    let props = WindowProperties(title: "Title", frame: .init(0, 0, 800, 600))
+    let props = WindowProperties(title: "Vulkan Window", frame: .init(0, 0, 800, 600))
 
     let window = try Window(properties: props,
                             surface: makeVLKSurface)

Package.swift

@@ -127,6 +127,12 @@ let package = Package(
             path: "Demos/VulkanBackendDemoApp",
             swiftSettings: swiftSettings
         ),
+        .executableTarget(
+            name: "MetalBackendDemoApp",
+            dependencies: ["FirebladePAL"],
+            path: "Demos/MetalBackendDemoApp",
+            swiftSettings: swiftSettings
+        ),
         .testTarget(name: "FirebladePALTests",
                     dependencies: ["FirebladePAL"]),
     ]

Sources/FirebladePAL/Platform/SDL/SDLWindow.swift

@@ -123,12 +123,12 @@
 
         public var sizeInPixels: Size<Int> {
             #if os(macOS) || os(iOS) || os(tvOS)
-            var w: Int32 = 0, h: Int32 = 0
-            SDL_GetWindowSizeInPixels(_window, &w, &h)
-            return Size(width: Int(w), height: Int(h))
+                var w: Int32 = 0, h: Int32 = 0
+                SDL_GetWindowSizeInPixels(_window, &w, &h)
+                return Size(width: Int(w), height: Int(h))
             #else
-            #warning("Requires SDL 2.26.0 - falling back to `size`.")
-            return size
+                #warning("Requires SDL 2.26.0 - falling back to `size`.")
+                return size
             #endif
         }