Actually, filename really does need to be a parameter because of some random debug thing.

Source/Core/VideoBackends/OGL/Src/Render.cpp

@@ -1378,7 +1378,8 @@ void Renderer::Swap(u32 xfbAddr, u32 fbWidth, u32 fbHeight,const EFBRectangle& r
 	// Save screenshot
 	if (s_bScreenshot)
 	{
-		TakeScreenshot(flipped_trc);
+		TakeScreenshot(flipped_trc, s_sScreenshotName);
+		s_bScreenshot = false;
 		// Reset settings
 	}
 
@@ -1772,7 +1773,7 @@ void Renderer::FlipImageData(u8 *data, int w, int h)
 	}
 }
 
-void Renderer::TakeScreenshot(const TargetRectangle &back_rc)
+void Renderer::TakeScreenshot(const TargetRectangle &back_rc, std::string filename)
 {
 	u32 W = back_rc.GetWidth();
 	u32 H = back_rc.GetHeight();
@@ -1792,7 +1793,7 @@ void Renderer::TakeScreenshot(const TargetRectangle &back_rc)
 	// Turn image upside down
 	FlipImageData(data, W, H);
 
-	SaveScreenshot(data, W, H);
+	SaveScreenshot(data, W, H, filename);
 }
 
 }

Source/Core/VideoBackends/OGL/Src/Render.h

@@ -80,7 +80,7 @@ public:
 
 	void UpdateViewport();
 
-	static void TakeScreenshot(const TargetRectangle &rc);
+	static void TakeScreenshot(const TargetRectangle &rc, std::string filename);
 
 private:
 	void UpdateEFBCache(EFBAccessType type, u32 cacheRectIdx, const EFBRectangle& efbPixelRc, const TargetRectangle& targetPixelRc, const u32* data);

Source/Core/VideoBackends/OGL/Src/VertexManager.cpp

@@ -341,7 +341,7 @@ void VertexManager::vFlush()
 		tr.right = Renderer::GetTargetWidth();
 		tr.top = 0;
 		tr.bottom = Renderer::GetTargetHeight();
-		g_renderer->SaveScreenshot(str, tr);
+		static_cast<OGL::Renderer *>(g_renderer)->TakeScreenshot(tr, str);
 	}
 #endif
 	g_Config.iSaveTargetId++;