Added preprocessor gates around curl code

openVulkanoCpp/Host/WebResourceLoader.cpp

@@ -12,10 +12,16 @@
 #include <fstream>
 #include <sstream>
 
-#include <curl/curl.h>
+#if __has_include("curl/curl.h")
+	#include <curl/curl.h>		
+#else		
+	#pragma message ("Missing curl.h even though HAS_CURL is set")		
+	#undef HAS_CURL		
+#endif
 
 namespace OpenVulkano
 {
+#ifdef HAS_CURL
 	namespace
 	{
 		size_t CurlDownloader(void* contents, size_t size, size_t memBlockCount, void* userData)
@@ -26,6 +32,7 @@ namespace OpenVulkano
 			return totalSize;
 		}
 	}
+#endif
 
 	bool WebResourceLoader::IsUrl(const std::string& str)
 	{
@@ -36,12 +43,16 @@ namespace OpenVulkano
 	{
 		m_cacheDirectory = AppFolders::GetAppCacheDir() / "resources";
 		std::filesystem::create_directories(m_cacheDirectory);
+#ifdef HAS_CURL
 		curl_global_init(CURL_GLOBAL_DEFAULT);
+#endif
 	}
 
 	WebResourceLoader::~WebResourceLoader()
 	{
+#ifdef HAS_CURL
 		curl_global_cleanup();
+#endif
 	}
 
 	std::filesystem::path WebResourceLoader::GetCacheFilePath(const std::string& url)
@@ -55,6 +66,7 @@ namespace OpenVulkano
 	Array<char> WebResourceLoader::DownloadResource(const std::string& url)
 	{
 		std::vector<char> buffer;
+#ifdef HAS_CURL
 		CURL* curl = curl_easy_init();
 		if (curl)
 		{
@@ -80,6 +92,7 @@ namespace OpenVulkano
 		std::filesystem::path cacheFilePath = GetCacheFilePath(url);
 		std::ofstream file(cacheFilePath, std::ios::binary);
 		file.write(buffer.data(), buffer.size());
+#endif
 
 		return Array<char>(buffer);
 	}