rewrite objective c++ into objective c

rendering_api/vulkan/src/vulkan_surface/vulkan_surface.m

@@ -0,0 +1,36 @@
+#ifdef GN_PLATFORM_MACOS
+#include "vulkan_surface.h"
+#include "../instance/vulkan_instance.h"
+#include <AppKit/AppKit.h>
+#include <vulkan/vulkan_metal.h>
+#import <Cocoa/Cocoa.h>
+#import <QuartzCore/CAMetalLayer.h>
+#import <QuartzCore/QuartzCore.h>
+#import <Metal/Metal.h>
+
+
+#include "vulkan/vulkan_metal.h"
+gnReturnCode gnCreateMacOSWindowSurfaceFn(struct gnWindowSurface_t* windowSurface, gnInstance* instance, struct gnMacOSWindowSurfaceInfo_t createInfo) {
+    NSWindow* window = (__bridge NSWindow*)createInfo.window;
+    NSView* view = [window contentView];
+
+    CAMetalLayer* layer = [CAMetalLayer layer];
+    [layer setContentsScale:[window backingScaleFactor]];
+    [layer setFramebufferOnly:YES];
+
+    [view setLayer:layer];
+    [view setWantsLayer:YES];
+
+    windowSurface->windowSurface = malloc(sizeof(gnPlatformWindowSurface));
+    VkMetalSurfaceCreateInfoEXT surfaceCreateInfo = {};
+    surfaceCreateInfo.sType = VK_STRUCTURE_TYPE_METAL_SURFACE_CREATE_INFO_EXT;
+    surfaceCreateInfo.pNext = NULL;
+    surfaceCreateInfo.flags = 0;
+    surfaceCreateInfo.pLayer = layer;
+
+    VkResult result = vkCreateMetalSurfaceEXT(instance->instance->vk_instance, &surfaceCreateInfo, NULL, &windowSurface->windowSurface->surface);
+    if (result != VK_SUCCESS)
+        return GN_FAILED_TO_ATTACH_WINDOW;
+    return GN_SUCCESS;
+}
+#endif