1 files changed, 63 insertions, 10 deletions
diff --git a/platform/windows/os_windows.cpp b/platform/windows/os_windows.cpp
index fa8717a4b8..03f2199954 100644
--- a/platform/windows/os_windows.cpp
+++ b/platform/windows/os_windows.cpp
@@ -1273,21 +1273,74 @@ Error OS_Windows::initialize(const VideoMode &p_desired, int p_video_driver, int
 	}
 
 #if defined(OPENGL_ENABLED)
+
+	bool gles3_context = true;
 	if (p_video_driver == VIDEO_DRIVER_GLES2) {
-		gl_context = memnew(ContextGL_Win(hWnd, false));
-		gl_context->initialize();
+		gles3_context = false;
+	}
 
-		RasterizerGLES2::register_config();
-		RasterizerGLES2::make_current();
-	} else {
-		gl_context = memnew(ContextGL_Win(hWnd, true));
-		gl_context->initialize();
+	bool editor = Engine::get_singleton()->is_editor_hint();
+	bool gl_initialization_error = false;
+
+	gl_context = NULL;
+	while (!gl_context) {
+		gl_context = memnew(ContextGL_Win(hWnd, gles3_context));
+
+		if (gl_context->initialize() != OK) {
+			memdelete(gl_context);
+			gl_context = NULL;
+
+			if (GLOBAL_GET("rendering/quality/driver/driver_fallback") == "Best" || editor) {
+				if (p_video_driver == VIDEO_DRIVER_GLES2) {
+					gl_initialization_error = true;
+					break;
+				}
 
-		RasterizerGLES3::register_config();
-		RasterizerGLES3::make_current();
+				p_video_driver = VIDEO_DRIVER_GLES2;
+				gles3_context = false;
+			} else {
+				gl_initialization_error = true;
+				break;
+			}
+		}
+	}
+
+	while (true) {
+		if (gles3_context) {
+			if (RasterizerGLES3::is_viable() == OK) {
+				RasterizerGLES3::register_config();
+				RasterizerGLES3::make_current();
+				break;
+			} else {
+				if (GLOBAL_GET("rendering/quality/driver/driver_fallback") == "Best" || editor) {
+					p_video_driver = VIDEO_DRIVER_GLES2;
+					gles3_context = false;
+					continue;
+				} else {
+					gl_initialization_error = true;
+					break;
+				}
+			}
+		} else {
+			if (RasterizerGLES2::is_viable() == OK) {
+				RasterizerGLES2::register_config();
+				RasterizerGLES2::make_current();
+				break;
+			} else {
+				gl_initialization_error = true;
+				break;
+			}
+		}
+	}
+
+	if (gl_initialization_error) {
+		OS::get_singleton()->alert("Your video card driver does not support any of the supported OpenGL versions.\n"
+								   "Please update your drivers or if you have a very old or integrated GPU upgrade it.",
+				"Unable to initialize Video driver");
+		return ERR_UNAVAILABLE;
 	}
 
-	video_driver_index = p_video_driver; // FIXME TODO - FIX IF DRIVER DETECTION HAPPENS AND GLES2 MUST BE USED
+	video_driver_index = p_video_driver;
 
 	gl_context->set_use_vsync(video_mode.use_vsync);
 #endif