More iOS work

src/core/renderer_mtl/renderer_mtl.cpp

@@ -57,6 +57,10 @@ void RendererMTL::reset() {
 }
 
 void RendererMTL::display() {
+#ifdef PANDA3DS_IOS
+	return;
+#endif
+
 	CA::MetalDrawable* drawable = metalLayer->nextDrawable();
 	if (!drawable) {
 		return;
@@ -126,11 +130,17 @@ void RendererMTL::display() {
 
 void RendererMTL::initGraphicsContext(SDL_Window* window) {
 	// TODO: what should be the type of the view?
+
+#ifdef PANDA3DS_IOS
+	// On iOS, the SwiftUI side handles device<->MTKView interaction
+	device = MTL::CreateSystemDefaultDevice();
+#else
 	void* view = SDL_Metal_CreateView(window);
 	metalLayer = (CA::MetalLayer*)SDL_Metal_GetLayer(view);
 	device = MTL::CreateSystemDefaultDevice();
 	metalLayer->setDevice(device);
 	commandQueue = device->newCommandQueue();
+#endif
 
 	// Textures
 	MTL::TextureDescriptor* textureDescriptor = MTL::TextureDescriptor::alloc()->init();

src/ios_driver.mm

@@ -0,0 +1,34 @@
+#import <Foundation/Foundation.h>
+
+extern "C" {
+#include "ios_driver.h"
+}
+
+#undef ABS
+#undef NO
+
+#include <memory>
+#include "emulator.hpp"
+
+#define IOS_EXPORT extern "C" __attribute__((visibility("default")))
+
+std::unique_ptr<Emulator> emulator = nullptr;
+HIDService* hidService = nullptr;
+
+extern "C" __attribute__((visibility("default"))) void iosCreateEmulator() {
+	printf("Creating emulator\n");
+
+	emulator = std::make_unique<Emulator>();
+	hidService = &emulator->getServiceManager().getHID();
+	emulator->initGraphicsContext(nullptr);
+
+	// auto path = emulator->getAppDataRoot() / "Kirb Demo.3ds";
+	auto path = emulator->getAppDataRoot() / "SimplerTri.elf";
+	emulator->loadROM(path);
+
+	while (1) {
+		emulator->runFrame();
+	}
+
+	printf("Created emulator\n");
+}