Split F2DDrawer::Flush into Draw and Clear

src/gl/renderer/gl_2ddrawer.cpp

@@ -378,7 +378,7 @@ void F2DDrawer::AddPixel(int x1, int y1, int palcolor, uint32 color)
 //
 //==========================================================================
 
-void F2DDrawer::Flush()
+void F2DDrawer::Draw()
 {
 	F2DDrawer::EDrawType lasttype = DrawTypeTexture;
 
@@ -490,10 +490,12 @@ void F2DDrawer::Flush()
 		}
 		i += dg->mLen;
 	}
-	mVertices.Clear();
-	mData.Clear();
 	gl_RenderState.SetVertexBuffer(GLRenderer->mVBO);
 	glset.lightmode = savedlightmode;
 }
 
-
+void F2DDrawer::Clear()
+{
+	mVertices.Clear();
+	mData.Clear();
+}

src/gl/renderer/gl_2ddrawer.h

@@ -66,7 +66,8 @@ public:
 	void AddLine(int x1, int y1, int x2, int y2, int palcolor, uint32 color);
 	void AddPixel(int x1, int y1, int palcolor, uint32 color);
 		
-	void Flush();
+	void Draw();
+	void Clear();
 };
 
 

src/gl/renderer/gl_postprocess.cpp

@@ -397,9 +397,10 @@ void FGLRenderer::Flush()
 		{
 			FGLDebug::PushGroup("Eye2D");
 			mBuffers->BindEyeFB(eye_ix);
-			m2DDrawer->Flush(); // Draw the 2D
+			m2DDrawer->Draw();
 			FGLDebug::PopGroup();
 		}
+		m2DDrawer->Clear();
 
 		FGLPostProcessState savedState;
 		FGLDebug::PushGroup("PresentEyes");
@@ -416,7 +417,9 @@ void FGLRenderer::Flush()
 
 void FGLRenderer::CopyToBackbuffer(const GL_IRECT *bounds, bool applyGamma)
 {
-	m2DDrawer->Flush();	// draw all pending 2D stuff before copying the buffer
+	m2DDrawer->Draw();	// draw all pending 2D stuff before copying the buffer
+	m2DDrawer->Clear();
+
 	FGLDebug::PushGroup("CopyToBackbuffer");
 	if (FGLRenderBuffers::IsEnabled())
 	{

src/gl/system/gl_wipe.cpp

@@ -189,7 +189,8 @@ bool OpenGLFrameBuffer::WipeStartScreen(int type)
 
 void OpenGLFrameBuffer::WipeEndScreen()
 {
-	GLRenderer->m2DDrawer->Flush();
+	GLRenderer->m2DDrawer->Draw();
+	GLRenderer->m2DDrawer->Clear();
 
 	const auto &viewport = GLRenderer->mScreenViewport;
 	wipeendscreen = new FHardwareTexture(viewport.width, viewport.height, true);