3 files changed, 18 insertions, 14 deletions
diff --git a/backends/graphics/opengl/opengl-graphics.cpp b/backends/graphics/opengl/opengl-graphics.cpp
index 57c2378649..40ef17e477 100644
--- a/backends/graphics/opengl/opengl-graphics.cpp
+++ b/backends/graphics/opengl/opengl-graphics.cpp
@@ -1245,12 +1245,16 @@ void OpenGLGraphicsManager::toggleAntialiasing() {
 	_transactionDetails.filterChanged = true;
 }
 
-uint OpenGLGraphicsManager::getAspectRatio() {
+uint OpenGLGraphicsManager::getAspectRatio() const {
 	// In case we enable aspect ratio correction we force a 4/3 ratio.
+	// But just for 320x200 and 640x400 games, since other games do not need
+	// this.
 	// TODO: This makes OpenGL Normal behave like OpenGL Conserve, when aspect
 	// ratio correction is enabled, but it's better than the previous 4/3 mode
 	// mess at least...
-	if (_videoMode.aspectRatioCorrection)
+	if (_videoMode.aspectRatioCorrection
+	    && ((_videoMode.screenWidth == 320 && _videoMode.screenHeight == 200)
+	    || (_videoMode.screenWidth == 640 && _videoMode.screenHeight == 400)))
 		return 13333;
 	else if (_videoMode.mode == OpenGL::GFX_NORMAL)
 		return _videoMode.hardwareWidth * 10000 / _videoMode.hardwareHeight;
diff --git a/backends/graphics/opengl/opengl-graphics.h b/backends/graphics/opengl/opengl-graphics.h
index 8a110b2d5f..42cfbacc85 100644
--- a/backends/graphics/opengl/opengl-graphics.h
+++ b/backends/graphics/opengl/opengl-graphics.h
@@ -214,10 +214,7 @@ protected:
 	virtual void calculateDisplaySize(int &width, int &height);
 	virtual void refreshDisplaySize();
 
-	/**
-	 * Returns the current target aspect ratio x 10000
-	 */
-	virtual uint getAspectRatio();
+	uint getAspectRatio() const;
 
 	bool _formatBGR;
 
diff --git a/backends/graphics/openglsdl/openglsdl-graphics.cpp b/backends/graphics/openglsdl/openglsdl-graphics.cpp
index d2810818e7..84515732fe 100644
--- a/backends/graphics/openglsdl/openglsdl-graphics.cpp
+++ b/backends/graphics/openglsdl/openglsdl-graphics.cpp
@@ -313,14 +313,17 @@ bool OpenGLSdlGraphicsManager::loadGFXMode() {
 		_videoMode.overlayWidth = _videoMode.hardwareWidth = _videoMode.screenWidth * scaleFactor;
 		_videoMode.overlayHeight = _videoMode.hardwareHeight = _videoMode.screenHeight * scaleFactor;
 
-		int screenAspectRatio = _videoMode.screenWidth * 10000 / _videoMode.screenHeight;
-		int desiredAspectRatio = getAspectRatio();
-
-		// Do not downscale dimensions, only enlarge them if needed
-		if (screenAspectRatio > desiredAspectRatio)
-			_videoMode.hardwareHeight = (_videoMode.overlayWidth * 10000  + 5000) / desiredAspectRatio;
-		else if (screenAspectRatio < desiredAspectRatio)
-			_videoMode.hardwareWidth = (_videoMode.overlayHeight * desiredAspectRatio + 5000) / 10000;
+		// The only modes where we need to adapt the aspect ratio are 320x200
+		// and 640x400. That is since our aspect ratio correction in fact is
+		// only used to ensure that the original pixel size aspect for these
+		// modes is used.
+		// (Non-square pixels on old monitors vs square pixel on new ones).
+		if (_videoMode.aspectRatioCorrection
+		    && ((_videoMode.screenWidth == 320 && _videoMode.screenHeight == 200)
+		    || (_videoMode.screenWidth == 640 && _videoMode.screenHeight == 400)))
+			_videoMode.overlayHeight = _videoMode.hardwareHeight = 240 * scaleFactor;
+		else
+			_videoMode.overlayHeight = _videoMode.hardwareHeight = _videoMode.screenHeight * scaleFactor;
 	}
 
 	_screenResized = false;