From 4400d0cfcc4df9ca11d49f0ec495b580d4c53d02 Mon Sep 17 00:00:00 2001
From: "alexey.lysiuk" <alexey.lysiuk@gmail.com>
Date: Sat, 30 Apr 2016 16:29:22 +0300
Subject: [PATCH] Fixed restoration of previously bound FBO

---
 src/gl/renderer/gl_renderer.cpp | 4 +++-
 src/gl/renderer/gl_renderer.h   | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/gl/renderer/gl_renderer.cpp b/src/gl/renderer/gl_renderer.cpp
index e3b9b0a8b..9e8212c0b 100644
--- a/src/gl/renderer/gl_renderer.cpp
+++ b/src/gl/renderer/gl_renderer.cpp
@@ -122,6 +122,7 @@ void FGLRenderer::Initialize()
 	else mLights = NULL;
 	gl_RenderState.SetVertexBuffer(mVBO);
 	mFBID = 0;
+	mOldFBID = 0;
 
 	SetupLevel();
 	mShaderManager = new FShaderManager;
@@ -237,6 +238,7 @@ void FGLRenderer::FlushTextures()
 bool FGLRenderer::StartOffscreen()
 {
 	if (mFBID == 0) glGenFramebuffers(1, &mFBID);
+	glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &mOldFBID);
 	glBindFramebuffer(GL_FRAMEBUFFER, mFBID);
 	return true;
 }
@@ -249,7 +251,7 @@ bool FGLRenderer::StartOffscreen()
 
 void FGLRenderer::EndOffscreen()
 {
-	glBindFramebuffer(GL_FRAMEBUFFER, 0); 
+	glBindFramebuffer(GL_FRAMEBUFFER, mOldFBID); 
 }
 
 //===========================================================================
diff --git a/src/gl/renderer/gl_renderer.h b/src/gl/renderer/gl_renderer.h
index 52ce5b2fa..a78b8c5dc 100644
--- a/src/gl/renderer/gl_renderer.h
+++ b/src/gl/renderer/gl_renderer.h
@@ -71,6 +71,7 @@ public:
 	int gl_spriteindex;
 	unsigned int mFBID;
 	unsigned int mVAOID;
+	int mOldFBID;
 
 	FTexture *gllight;
 	FTexture *glpart2;