Qt: Improve OpenGLES support and cleanup ifdef maze

src/platform/qt/Display.cpp

@@ -33,49 +33,33 @@ QGBA::Display* QGBA::Display::create(QWidget* parent) {
 	switch (s_driver) {
 #if defined(BUILD_GL) || defined(BUILD_GLES2) || defined(BUILD_GLES3) || defined(USE_EPOXY)
 	case Driver::OPENGL:
-#if defined(BUILD_GLES2) || defined(BUILD_GLES3) || defined(USE_EPOXY)
-		if (QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGLES) {
-			format.setVersion(2, 0);
-		} else {
-			format.setVersion(3, 3);
+	default:
+		if (DisplayGL::highestCompatible(format)) {
+			return new DisplayGL(format, parent);
 		}
-		format.setProfile(QSurfaceFormat::CoreProfile);
-		if (DisplayGL::supportsFormat(format)) {
-			QSurfaceFormat::setDefaultFormat(format);
-		} else {
-#ifdef BUILD_GL
-			LOG(QT, WARN) << ("Failed to create an OpenGL Core context, trying old-style...");
-			format.setVersion(1, 4);
-			format.setOption(QSurfaceFormat::DeprecatedFunctions);
-			if (!DisplayGL::supportsFormat(format)) {
-				return nullptr;
-			}
-#else
-			return nullptr;
-#endif
-		}
-		return new DisplayGL(format, parent);
-#endif
+		break;
 #endif
 #ifdef BUILD_GL
 	case Driver::OPENGL1:
-		format.setVersion(1, 4);
-		if (!DisplayGL::supportsFormat(format)) {
-			return nullptr;
+		if (QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGL) {
+			format.setVersion(1, 4);
+		} else {
+			format.setVersion(1, 1);
 		}
-		return new DisplayGL(format, parent);
+		if (DisplayGL::supportsFormat(format)) {
+			return new DisplayGL(format, parent);
+		}
+		break;
 #endif
 
 	case Driver::QT:
+#if !defined(BUILD_GL) && !defined(BUILD_GLES2) && !defined(BUILD_GLES3) && !defined(USE_EPOXY)
+	default:
+#endif
 		return new DisplayQt(parent);
 
-	default:
-#if defined(BUILD_GL) || defined(BUILD_GLES2) || defined(BUILD_GLES3) || defined(USE_EPOXY)
-		return new DisplayGL(format, parent);
-#else
-		return new DisplayQt(parent);
-#endif
 	}
+	return nullptr;
 }
 
 QGBA::Display::Display(QWidget* parent)

src/platform/qt/DisplayGL.cpp

@@ -53,6 +53,12 @@ typedef struct _XDisplay Display;
 #define OVERHEAD_NSEC 300000
 #endif
 
+// Legacy define from X11/X.h
+#ifdef Unsorted
+#undef Unsorted
+#endif
+
+#include "LogController.h"
 #include "OpenGLBug.h"
 #include "utils.h"
 
@@ -277,6 +283,47 @@ void DisplayGL::startDrawing(std::shared_ptr<CoreController> controller) {
 	QTimer::singleShot(8, this, &DisplayGL::updateContentSize);
 }
 
+bool DisplayGL::highestCompatible(QSurfaceFormat& format) {
+#if defined(BUILD_GLES2) || defined(BUILD_GLES3) || defined(USE_EPOXY)
+	if (QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGL) {
+		format.setVersion(3, 3);
+		format.setProfile(QSurfaceFormat::CoreProfile);
+		if (DisplayGL::supportsFormat(format)) {
+			return true;
+		}
+	} else {
+#if defined(BUILD_GLES3) || defined(USE_EPOXY)
+		format.setVersion(3, 1);
+		if (DisplayGL::supportsFormat(format)) {
+			return true;
+		}
+#endif
+#if defined(BUILD_GLES2) || defined(USE_EPOXY)
+		format.setVersion(2, 0);
+		if (DisplayGL::supportsFormat(format)) {
+			return true;
+		}
+#endif
+	}
+#endif
+
+#ifdef BUILD_GL
+#if defined(BUILD_GLES2) || defined(BUILD_GLES3) || defined(USE_EPOXY)
+	LOG(QT, WARN) << tr("Failed to create an OpenGL 3 context, trying old-style...");
+#endif
+	if (QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGL) {
+		format.setVersion(1, 4);
+	} else {
+		format.setVersion(1, 1);			
+	}
+	format.setOption(QSurfaceFormat::DeprecatedFunctions);
+	if (DisplayGL::supportsFormat(format)) {
+			return true;
+	}
+#endif
+	return false;
+}
+
 bool DisplayGL::supportsFormat(const QSurfaceFormat& format) {
 	if (!s_supports.contains(format)) {
 		QOpenGLContext context;

src/platform/qt/DisplayGL.h

@@ -96,6 +96,7 @@ public:
 	int framebufferHandle() override;
 	QSize contentSize() const override { return m_cachedContentSize; }
 
+	static bool highestCompatible(QSurfaceFormat&);
 	static bool supportsFormat(const QSurfaceFormat&);
 
 public slots: