UWP: Add support for GLES2 driver

platform/uwp/app.cpp

@@ -143,14 +143,13 @@ void App::SetWindow(CoreWindow ^ p_window) {
 	window->KeyUp +=
 			ref new TypedEventHandler<CoreWindow ^, KeyEventArgs ^>(this, &App::OnKeyUp);
 
+	os->set_window(window);
+
 	unsigned int argc;
 	char **argv = get_command_line(&argc);
 
 	Main::setup("uwp", argc, argv, false);
 
-	// The CoreWindow has been created, so EGL can be initialized.
-	ContextEGL *context = memnew(ContextEGL(window));
-	os->set_gl_context(context);
 	UpdateWindowSize(Size(window->Bounds.Width, window->Bounds.Height));
 
 	Main::setup2();
@@ -513,7 +512,7 @@ char **App::get_command_line(unsigned int *out_argc) {
 
 	if (f == NULL) {
 
-		wprintf(L"Couldn't open command line file.");
+		wprintf(L"Couldn't open command line file.\n");
 		return fail_cl;
 	}
 
@@ -527,7 +526,7 @@ char **App::get_command_line(unsigned int *out_argc) {
 
 	if (r < 4) {
 		fclose(f);
-		wprintf(L"Wrong cmdline length.");
+		wprintf(L"Wrong cmdline length.\n");
 		return (fail_cl);
 	}
 
@@ -539,7 +538,7 @@ char **App::get_command_line(unsigned int *out_argc) {
 
 		if (r < 4) {
 			fclose(f);
-			wprintf(L"Wrong cmdline param length.");
+			wprintf(L"Wrong cmdline param length.\n");
 			return (fail_cl);
 		}
 
@@ -547,7 +546,7 @@ char **App::get_command_line(unsigned int *out_argc) {
 
 		if (strlen > CMD_MAX_LEN) {
 			fclose(f);
-			wprintf(L"Wrong command length.");
+			wprintf(L"Wrong command length.\n");
 			return (fail_cl);
 		}
 
@@ -568,7 +567,7 @@ char **App::get_command_line(unsigned int *out_argc) {
 
 			delete[] arg;
 			fclose(f);
-			wprintf(L"Error reading command.");
+			wprintf(L"Error reading command.\n");
 			return (fail_cl);
 		}
 	}

platform/uwp/gl_context_egl.cpp

@@ -93,12 +93,26 @@ Error ContextEGL::initialize() {
 
 	EGLint numConfigs = 0;
 	EGLint majorVersion = 1;
-	EGLint minorVersion = 0;
+	EGLint minorVersion;
+	if (driver == GLES_2_0) {
+		minorVersion = 0;
+	} else {
+		minorVersion = 5;
+	}
 	EGLDisplay display = EGL_NO_DISPLAY;
 	EGLContext context = EGL_NO_CONTEXT;
 	EGLSurface surface = EGL_NO_SURFACE;
 	EGLConfig config = nullptr;
-	EGLint contextAttribs[] = { EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE, EGL_NONE };
+	EGLint contextAttribs[3];
+	if (driver == GLES_2_0) {
+		contextAttribs[0] = EGL_CONTEXT_CLIENT_VERSION;
+		contextAttribs[1] = 2;
+		contextAttribs[2] = EGL_NONE;
+	} else {
+		contextAttribs[0] = EGL_CONTEXT_CLIENT_VERSION;
+		contextAttribs[1] = 3;
+		contextAttribs[2] = EGL_NONE;
+	}
 
 	try {
 
@@ -114,7 +128,8 @@ Error ContextEGL::initialize() {
 
 			// EGL_ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER is an optimization that can have large performance benefits on mobile devices.
 			// Its syntax is subject to change, though. Please update your Visual Studio templates if you experience compilation issues with it.
-			//EGL_ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER, EGL_TRUE,
+			EGL_ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER,
+			EGL_TRUE,
 
 			// EGL_PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE is an option that enables ANGLE to automatically call
 			// the IDXGIDevice3::Trim method on behalf of the application when it gets suspended.
@@ -193,13 +208,12 @@ void ContextEGL::cleanup() {
 	}
 };
 
-ContextEGL::ContextEGL(CoreWindow ^ p_window) :
+ContextEGL::ContextEGL(CoreWindow ^ p_window, Driver p_driver) :
 		mEglDisplay(EGL_NO_DISPLAY),
 		mEglContext(EGL_NO_CONTEXT),
-		mEglSurface(EGL_NO_SURFACE) {
-
-	window = p_window;
-};
+		mEglSurface(EGL_NO_SURFACE),
+		driver(p_driver),
+		window(p_window) {}
 
 ContextEGL::~ContextEGL() {
 

platform/uwp/gl_context_egl.h

@@ -42,6 +42,13 @@ using namespace Windows::UI::Core;
 
 class ContextEGL : public ContextGL {
 
+public:
+	enum Driver {
+		GLES_2_0,
+		GLES_3_0,
+	};
+
+private:
 	CoreWindow ^ window;
 
 	EGLDisplay mEglDisplay;
@@ -53,6 +60,8 @@ class ContextEGL : public ContextGL {
 
 	bool vsync;
 
+	Driver driver;
+
 public:
 	virtual void release_current();
 
@@ -70,7 +79,7 @@ public:
 
 	void cleanup();
 
-	ContextEGL(CoreWindow ^ p_window);
+	ContextEGL(CoreWindow ^ p_window, Driver p_driver);
 	~ContextEGL();
 };
 

platform/uwp/os_uwp.cpp

@@ -30,6 +30,7 @@
 
 #include "os_uwp.h"
 
+#include "drivers/gles2/rasterizer_gles2.h"
 #include "drivers/gles3/rasterizer_gles3.h"
 #include "drivers/unix/ip_unix.h"
 #include "drivers/windows/dir_access_windows.h"
@@ -66,12 +67,7 @@ using namespace Windows::ApplicationModel::DataTransfer;
 using namespace concurrency;
 
 int OSUWP::get_video_driver_count() const {
-
-	return 1;
-}
-const char *OSUWP::get_video_driver_name(int p_driver) const {
-
-	return "GLES3";
+	return 2;
 }
 
 Size2 OSUWP::get_window_size() const {
@@ -133,18 +129,6 @@ void OSUWP::set_keep_screen_on(bool p_enabled) {
 	OS::set_keep_screen_on(p_enabled);
 }
 
-int OSUWP::get_audio_driver_count() const {
-
-	return AudioDriverManager::get_driver_count();
-}
-
-const char *OSUWP::get_audio_driver_name(int p_driver) const {
-
-	AudioDriver *driver = AudioDriverManager::get_driver(p_driver);
-	ERR_FAIL_COND_V(!driver, "");
-	return AudioDriverManager::get_driver(p_driver)->get_name();
-}
-
 void OSUWP::initialize_core() {
 
 	last_button_state = 0;
@@ -185,10 +169,9 @@ bool OSUWP::can_draw() const {
 	return !minimized;
 };
 
-void OSUWP::set_gl_context(ContextEGL *p_context) {
-
-	gl_context = p_context;
-};
+void OSUWP::set_window(Windows::UI::Core::CoreWindow ^ p_window) {
+	window = p_window;
+}
 
 void OSUWP::screen_size_changed() {
 
@@ -200,6 +183,11 @@ Error OSUWP::initialize(const VideoMode &p_desired, int p_video_driver, int p_au
 	main_loop = NULL;
 	outside = true;
 
+	if (p_video_driver == VIDEO_DRIVER_GLES2) {
+		gl_context = memnew(ContextEGL(window, ContextEGL::GLES_2_0));
+	} else {
+		gl_context = memnew(ContextEGL(window, ContextEGL::GLES_3_0));
+	}
 	gl_context->initialize();
 	VideoMode vm;
 	vm.width = gl_context->get_window_width();
@@ -240,8 +228,13 @@ Error OSUWP::initialize(const VideoMode &p_desired, int p_video_driver, int p_au
 
 	gl_context->make_current();
 
-	RasterizerGLES3::register_config();
-	RasterizerGLES3::make_current();
+	if (p_video_driver == VIDEO_DRIVER_GLES2) {
+		RasterizerGLES2::register_config();
+		RasterizerGLES2::make_current();
+	} else {
+		RasterizerGLES3::register_config();
+		RasterizerGLES3::make_current();
+	}
 	gl_context->set_use_vsync(vm.use_vsync);
 
 	visual_server = memnew(VisualServerRaster);

platform/uwp/os_uwp.h

@@ -96,6 +96,7 @@ private:
 	int pressrc;
 
 	ContextEGL *gl_context;
+	Windows::UI::Core::CoreWindow ^ window;
 
 	VideoMode video_mode;
 
@@ -153,10 +154,6 @@ private:
 	// functions used by main to initialize/deintialize the OS
 protected:
 	virtual int get_video_driver_count() const;
-	virtual const char *get_video_driver_name(int p_driver) const;
-
-	virtual int get_audio_driver_count() const;
-	virtual const char *get_audio_driver_name(int p_driver) const;
 
 	virtual void initialize_core();
 	virtual Error initialize(const VideoMode &p_desired, int p_video_driver, int p_audio_driver);
@@ -231,7 +228,7 @@ public:
 
 	virtual bool _check_internal_feature_support(const String &p_feature);
 
-	void set_gl_context(ContextEGL *p_context);
+	void set_window(Windows::UI::Core::CoreWindow ^ p_window);
 	void screen_size_changed();
 
 	virtual void release_rendering_thread();