Add new function glfwResetCocoaMTKFrame

- glfwResetCocoaFrame is a helper function that allows glfw to resize an MTKView

- also adds CMake configurations to allow Metal integration to be optional.

CMakeLists.txt

@@ -46,6 +46,8 @@ cmake_dependent_option(GLFW_USE_HYBRID_HPG "Force use of high-performance GPU on
 cmake_dependent_option(USE_MSVC_RUNTIME_LIBRARY_DLL "Use MSVC runtime library DLL" ON
                        "MSVC" OFF)
 
+cmake_dependent_option(GLFW_USE_METALKIT "Allow GLFW to include MetalKit.h for metal support" OFF GLFW_BUILD_COCOA ON)
+
 set(GLFW_LIBRARY_TYPE "${GLFW_LIBRARY_TYPE}" CACHE STRING
     "Library type override for GLFW (SHARED, STATIC, OBJECT, or empty to follow BUILD_SHARED_LIBS)")
 

include/GLFW/glfw3native.h

@@ -289,6 +289,20 @@ GLFWAPI id glfwGetCocoaWindow(GLFWwindow* window);
  */
 GLFWAPI void glfwAddCocoaMTKSubview(GLFWwindow* window, void* view);
 
+
+/*! @brief Resizes an 'MTKView' to the window's framebuffer size -helpful because the Apple metal-cpp API lacks the ability to do this
+ *
+ *
+ *  @errors Possible errors include @ref GLFW_NOT_INITIALIZED.
+ *
+ *  @thread_safety Call this function from the main thread.
+ *
+ *  @since Added in version 3.3.
+ *
+ *  @ingroup native
+ */
+GLFWAPI void glfwResetCocoaMTKFramesize(GLFWwindow* window, void* view);
+
 #endif
 
 #if defined(GLFW_EXPOSE_NATIVE_NSGL)

src/CMakeLists.txt

@@ -31,6 +31,9 @@ set_target_properties(update_mappings PROPERTIES FOLDER "GLFW3")
 
 if (GLFW_BUILD_COCOA)
     target_compile_definitions(glfw PRIVATE _GLFW_COCOA)
+    if(GLFW_USE_METALKIT)
+        target_compile_definitions(glfw PRIVATE _GLFW_BUILD_METAL_DEPENDENCIES)
+    endif()
     target_sources(glfw PRIVATE cocoa_platform.h cocoa_joystick.h cocoa_init.m
                                 cocoa_joystick.m cocoa_monitor.m cocoa_window.m
                                 nsgl_context.m)

src/cocoa_window.m

@@ -30,7 +30,6 @@
 
 #include <float.h>
 #include <string.h>
-#import <MetalKit/MetalKit.h>
 
 // Returns the style mask corresponding to the window settings
 //
@@ -276,6 +275,7 @@ static const NSRange kEmptyRange = { NSNotFound, 0 };
         window->ns.height = contentRect.size.height;
         _glfwInputWindowSize(window, contentRect.size.width, contentRect.size.height);
     }
+
 }
 
 - (void)windowDidMove:(NSNotification *)notification
@@ -363,6 +363,7 @@ static const NSRange kEmptyRange = { NSNotFound, 0 };
 
         [self updateTrackingAreas];
         [self registerForDraggedTypes:@[NSPasteboardTypeURL]];
+        
     }
 
     return self;
@@ -1951,6 +1952,9 @@ GLFWAPI id glfwGetCocoaWindow(GLFWwindow* handle)
     return window->ns.object;
 }
 
+
+#ifdef _GLFW_BUILD_METAL_DEPENDENCIES
+#import <MetalKit/MetalKit.h>
 GLFWAPI void glfwAddCocoaMTKSubview(GLFWwindow* handle, void* view) {
 
     _GLFWwindow* window = (_GLFWwindow*) handle;
@@ -1968,3 +1972,44 @@ GLFWAPI void glfwAddCocoaMTKSubview(GLFWwindow* handle, void* view) {
 
 }
 
+GLFWAPI void glfwResetCocoaMTKFramesize(GLFWwindow* handle, void* view) { 
+
+    _GLFWwindow* window = (_GLFWwindow*) handle;
+    _GLFW_REQUIRE_INIT_OR_RETURN();
+
+    if (_glfw.platform.platformID != GLFW_PLATFORM_COCOA)
+    {
+        _glfwInputError(GLFW_PLATFORM_UNAVAILABLE,
+                        "Cocoa: Platform not initialized");
+        return;
+    }
+
+    MTKView* mtkView = (MTKView*) view;
+    int width, height;
+    _glfwGetFramebufferSizeCocoa(window, &width, &height);
+    NSSize size = NSMakeSize(width, height);
+    [mtkView setFrameSize: size];
+
+
+}
+
+#else
+GLFWAPI void glfwAddCocoaMTKSubview(GLFWwindow* handle, void* view) {
+
+    _GLFW_REQUIRE_INIT_OR_RETURN();
+    _glfwInputError(GLFW_PLATFORM_ERROR,
+                    "GLFW was compiled without \"GLFW_USE_METALKIT\" enabled");
+    
+
+}
+
+GLFWAPI void glfwResetCocoaMTKFramesize(GLFWwindow* handle, void* view) {
+
+    _GLFW_REQUIRE_INIT_OR_RETURN();
+    _glfwInputError(GLFW_PLATFORM_ERROR,
+                    "GLFW was compiled without \"GLFW_USE_METALKIT\" enabled");
+
+}
+
+
+#endif