From e5b2dec8381ff69bfb89ed9cb2fc38da97cf253f Mon Sep 17 00:00:00 2001
From: nds <nds@opencascade.com>
Date: Sat, 21 Mar 2020 20:13:55 +0300
Subject: [PATCH] 0031457: Visualization - interface to find an active frame
 buffer

---
 src/OpenGl/OpenGl_Context.hxx     | 13 +++++++++++++
 src/OpenGl/OpenGl_FrameBuffer.cxx |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/src/OpenGl/OpenGl_Context.hxx b/src/OpenGl/OpenGl_Context.hxx
index 916478e1a4..b1d16e311f 100644
--- a/src/OpenGl/OpenGl_Context.hxx
+++ b/src/OpenGl/OpenGl_Context.hxx
@@ -916,6 +916,18 @@ public: //! @name methods to alter or retrieve current state
   //! Bind default Vertex Array Object
   Standard_EXPORT void BindDefaultVao();
 
+  //! Active Frame Buffer Object.
+  const Handle(OpenGl_FrameBuffer)& ActiveFrameBuffer() const
+  {
+    return myActiveFbo;
+  }
+
+  //! Setup Active Frame Buffer Object.
+  Standard_EXPORT void SetActiveFrameBuffer (const Handle(OpenGl_FrameBuffer)& theFbo)
+  {
+    myActiveFbo = theFbo;
+  }
+
   //! Default Frame Buffer Object.
   const Handle(OpenGl_FrameBuffer)& DefaultFrameBuffer() const
   {
@@ -1173,6 +1185,7 @@ private: //! @name fields tracking current state
                                                    //!< currently active sampler objects
   Standard_Integer              myActiveMockTextures; //!< currently active mock sampler objects
   Handle(OpenGl_FrameBuffer)    myDefaultFbo;      //!< default Frame Buffer Object
+  Handle(OpenGl_FrameBuffer)    myActiveFbo;       //!< active Frame Buffer Object
   Handle(OpenGl_LineAttributes) myHatchStyles;     //!< resource holding predefined hatch styles patterns
   Standard_Integer              myActiveHatchType; //!< currently activated type of polygon hatch
   Standard_Boolean              myHatchIsEnabled;  //!< current enabled state of polygon hatching rasterization
diff --git a/src/OpenGl/OpenGl_FrameBuffer.cxx b/src/OpenGl/OpenGl_FrameBuffer.cxx
index a05e321660..00fd8c2f84 100644
--- a/src/OpenGl/OpenGl_FrameBuffer.cxx
+++ b/src/OpenGl/OpenGl_FrameBuffer.cxx
@@ -692,6 +692,8 @@ void OpenGl_FrameBuffer::BindBuffer (const Handle(OpenGl_Context)& theGlCtx)
 {
   theGlCtx->arbFBO->glBindFramebuffer (GL_FRAMEBUFFER, myGlFBufferId);
   theGlCtx->SetFrameBufferSRGB (true);
+  
+  theGlCtx->SetActiveFrameBuffer (this);
 }
 
 // =======================================================================
-- 
2.39.5