Fix drivers coding for WinRT

- Add a proper function to retrieve IP addresses.
- Solve issues with Windows FileAccess and DirAccess to use the same code
  for WinRT.
- Add patches to the GLES2 rasterizer to workaround ANGLE issues.

drivers/gles2/rasterizer_gles2.cpp

@@ -5210,7 +5210,6 @@ bool RasterizerGLES2::_setup_material(const Geometry *p_geometry,const Material
 
 		material_shader.set_conditional(MaterialShaderGLES2::USE_FOG,current_env && current_env->fx_enabled[VS::ENV_FX_FOG]);
 		//glDepthMask( true );
-
 	}
 
 
@@ -10833,6 +10832,11 @@ void RasterizerGLES2::init() {
 	copy_shader.set_conditional(CopyShaderGLES2::USE_GLES_OVER_GL,true);
 #endif
 
+#ifdef ANGLE_ENABLED
+	// Fix for ANGLE
+	material_shader.set_conditional(MaterialShaderGLES2::DISABLE_FRONT_FACING, true);
+#endif
+
 
 	shadow=NULL;
 	shadow_pass=0;
@@ -10920,7 +10924,11 @@ void RasterizerGLES2::init() {
 
 
 	srgb_supported=extensions.has("GL_EXT_sRGB");
+#ifndef ANGLE_ENABLED
 	s3tc_srgb_supported =  s3tc_supported && extensions.has("GL_EXT_texture_compression_s3tc");
+#else
+	s3tc_srgb_supported = s3tc_supported;
+#endif
 	latc_supported = extensions.has("GL_EXT_texture_compression_latc");
 	anisotropic_level=1.0;
 	use_anisotropic_filter=extensions.has("GL_EXT_texture_filter_anisotropic");

drivers/gles2/shaders/material.glsl

@@ -811,7 +811,11 @@ void main() {
 	float specular_exp=1.0;
 	float glow=0.0;
 	float shade_param=0.0;
+#ifdef DISABLE_FRONT_FACING
+	float side=float(1)*2.0-1.0;
+#else
 	float side=float(gl_FrontFacing)*2.0-1.0;
+#endif
 #if defined(ENABLE_TANGENT_INTERP)
 	vec3 binormal = normalize(binormal_interp)*side;
 	vec3 tangent = normalize(tangent_interp)*side;

drivers/unix/ip_unix.cpp

@@ -28,7 +28,7 @@
 /*************************************************************************/
 #include "ip_unix.h"
 
-#if defined(UNIX_ENABLED) || defined(WINDOWS_ENABLED) && !defined(WINRT_ENABLED)
+#if defined(UNIX_ENABLED) || defined(WINDOWS_ENABLED)
 
 
 #ifdef WINDOWS_ENABLED
@@ -83,6 +83,19 @@ IP_Address IP_Unix::_resolve_hostname(const String& p_hostname) {
 
 void IP_Unix::get_local_addresses(List<IP_Address> *r_addresses) const {
 
+	using namespace Windows::Networking;
+	using namespace Windows::Networking::Connectivity;
+
+	auto hostnames = NetworkInformation::GetHostNames();
+
+	for (int i = 0; i < hostnames->Size; i++) {
+
+		if (hostnames->GetAt(i)->Type == HostNameType::Ipv4 && hostnames->GetAt(i)->IPInformation != nullptr) {
+
+			r_addresses->push_back(IP_Address(String(hostnames->GetAt(i)->CanonicalName->Data())));
+
+		}
+	}
 
 };
 #else

drivers/windows/dir_access_windows.cpp

@@ -37,12 +37,6 @@
 #include <stdio.h>
 #include "print_string.h"
 
-#ifdef WINRT_ENABLED
-#include <Synchapi.h>
-#include <collection.h>
-#include <ppltasks.h>
-#endif
-
 /*
 
 [03:57] <reduz> yessopie, so i dont havemak to rely on unicows
@@ -135,14 +129,6 @@ Error DirAccessWindows::change_dir(String p_dir) {
 
 	GLOBAL_LOCK_FUNCTION
 
-#ifdef WINRT_ENABLED
-
-	p_dir = fix_path(p_dir);
-	current_dir = normalize_path(p_dir);
-
-	return OK;
-#else
-
 
 	p_dir=fix_path(p_dir);
 
@@ -178,19 +164,12 @@ Error DirAccessWindows::change_dir(String p_dir) {
 	//}
 
 	return worked?OK:ERR_INVALID_PARAMETER;
-#endif
 }
 
 Error DirAccessWindows::make_dir(String p_dir) {
 
 	GLOBAL_LOCK_FUNCTION
 
-#ifdef WINRT_ENABLED
-
-	return ERR_CANT_CREATE;
-
-#else
-
 	if (p_dir.is_rel_path())
 		p_dir=get_current_dir().plus_file(p_dir);
 
@@ -215,8 +194,6 @@ Error DirAccessWindows::make_dir(String p_dir) {
 	};
 
 	return ERR_CANT_CREATE;
-
-#endif
 }
 
 
@@ -259,7 +236,6 @@ bool DirAccessWindows::file_exists(String p_file) {
 		return false;
 
 	return !(fileAttr&FILE_ATTRIBUTE_DIRECTORY);
-
 }
 
 bool DirAccessWindows::dir_exists(String p_dir) {
@@ -282,7 +258,6 @@ bool DirAccessWindows::dir_exists(String p_dir) {
 	if (INVALID_FILE_ATTRIBUTES == fileAttr)
 		    return false;
 	return (fileAttr&FILE_ATTRIBUTE_DIRECTORY);
-
 }
 
 Error DirAccessWindows::rename(String p_path,String p_new_path) {

drivers/windows/file_access_windows.cpp

@@ -124,7 +124,16 @@ void FileAccessWindows::close() {
 
 
 		bool rename_error;
+
+#ifdef WINRT_ENABLED
+		// WinRT has no PathFileExists, so we check attributes instead
+		DWORD fileAttr;
+
+		fileAttr = GetFileAttributesW(save_path.c_str());
+		if (INVALID_FILE_ATTRIBUTES == fileAttr) {
+#else
 		if (!PathFileExistsW(save_path.c_str())) {
+#endif
 			//creating new file
 			rename_error = _wrename((save_path+".tmp").c_str(),save_path.c_str())!=0;
 		} else {
@@ -139,7 +148,6 @@ void FileAccessWindows::close() {
 		ERR_FAIL_COND( rename_error );
 	}
 
-
 }
 bool FileAccessWindows::is_open() const {
 

drivers/windows/semaphore_windows.cpp

@@ -28,7 +28,7 @@
 /*************************************************************************/
 #include "semaphore_windows.h"
 
-#if defined(WINDOWS_ENABLED) && !defined(WINRT_ENABLED)
+#if defined(WINDOWS_ENABLED)
 
 #include "os/memory.h"