0028758: Visualization - Implement exporting generated image to HRD/EXR images

OpenGl_View::BufferDump() - added support for dumping RayTracing HDR buffers.
Added new buffer type Graphic3d_BT_RGB_RayTraceHdrLeft.

src/Graphic3d/Graphic3d_BufferType.hxx

@@ -19,7 +19,8 @@ typedef enum
 {
   Graphic3d_BT_RGB,   //!< color buffer without alpha component
   Graphic3d_BT_RGBA,  //!< color buffer
-  Graphic3d_BT_Depth  //!< depth buffer
+  Graphic3d_BT_Depth,  //!< depth buffer
+  Graphic3d_BT_RGB_RayTraceHdrLeft //!< left view HDR color buffer for Ray-Tracing
 } Graphic3d_BufferType;
 
 #endif // _Graphic3d_BufferType_H__

src/Image/Image_AlienPixMap.cxx

@@ -461,6 +461,7 @@ bool Image_AlienPixMap::Save (const TCollection_AsciiString& theFileName)
       }
       break;
     }
+    case FIF_HDR:
     case FIF_EXR:
     {
       if (Format() == Image_Format_Gray

src/OpenGl/OpenGl_View.cxx

@@ -353,7 +353,58 @@ void OpenGl_View::GraduatedTrihedronMinMaxValues (const Graphic3d_Vec3 theMin, c
 // =======================================================================
 Standard_Boolean OpenGl_View::BufferDump (Image_PixMap& theImage, const Graphic3d_BufferType& theBufferType)
 {
-  return myWorkspace->BufferDump (myFBO, theImage, theBufferType);
+  if (theBufferType != Graphic3d_BT_RGB_RayTraceHdrLeft)
+  {
+    return myWorkspace->BufferDump(myFBO, theImage, theBufferType);
+  }
+
+  if (!myRaytraceParameters.AdaptiveScreenSampling)
+  {
+    return myWorkspace->BufferDump(myAccumFrames % 2 ? myRaytraceFBO2[0] : myRaytraceFBO1[0], theImage, theBufferType);
+  }
+
+#if defined(GL_ES_VERSION_2_0)
+  return false;
+#else
+  if (theImage.Format() != Image_Format_RGBF)
+  {
+    return false;
+  }
+
+  const GLuint aW = myRaytraceOutputTexture[0]->SizeX();
+  const GLuint aH = myRaytraceOutputTexture[0]->SizeY();
+  if (aW / 3 != theImage.SizeX() || aH / 2 != theImage.SizeY())
+  {
+    return false;
+  }
+
+  std::vector<GLfloat> aValues;
+  try
+  {
+    aValues.resize (aW * aH);
+  }
+  catch (const std::bad_alloc&)
+  {
+    return false;
+  }
+
+  glBindTexture (GL_TEXTURE_RECTANGLE, myRaytraceOutputTexture[0]->TextureId());
+  glGetTexImage (GL_TEXTURE_RECTANGLE, 0, OpenGl_TextureFormat::Create<GLfloat, 1>().Format(), GL_FLOAT, &aValues[0]);
+  glBindTexture (GL_TEXTURE_RECTANGLE, 0);
+  for (unsigned int aRow = 0; aRow < aH; aRow += 2)
+  {
+    for (unsigned int aCol = 0; aCol < aW; aCol += 3)
+    {
+      float* anImageValue = theImage.ChangeValue<float[3]> ((aH - aRow) / 2 - 1, aCol / 3);
+      float aInvNbSamples = 1.f / aValues[aRow * aW + aCol + aW];
+      anImageValue[0] = aValues[aRow * aW + aCol] * aInvNbSamples;
+      anImageValue[1] = aValues[aRow * aW + aCol + 1] * aInvNbSamples;
+      anImageValue[2] = aValues[aRow * aW + aCol + 1 + aW] * aInvNbSamples;
+    }
+  }
+
+  return true;
+#endif
 }
 
 // =======================================================================

src/OpenGl/OpenGl_View.hxx

@@ -143,6 +143,8 @@ public:
   Standard_EXPORT virtual void GraduatedTrihedronMinMaxValues (const Graphic3d_Vec3 theMin, const Graphic3d_Vec3 theMax) Standard_OVERRIDE;
 
   //! Dump active rendering buffer into specified memory buffer.
+  //! In Ray-Tracing allow to get a raw HDR buffer using Graphic3d_BT_RGB_RayTraceHdrLeft buffer type,
+  //! only Left view will be dumped ignoring stereoscopic parameter.
   Standard_EXPORT virtual Standard_Boolean BufferDump (Image_PixMap& theImage,
                                                        const Graphic3d_BufferType& theBufferType) Standard_OVERRIDE;
 

src/V3d/V3d_View.cxx

@@ -2834,6 +2834,7 @@ Standard_Boolean V3d_View::ToPixMap (Image_PixMap&               theImage,
         case Graphic3d_BT_RGB:                 aFormat = Image_Format_RGB;   break;
         case Graphic3d_BT_RGBA:                aFormat = Image_Format_RGBA;  break;
         case Graphic3d_BT_Depth:               aFormat = Image_Format_GrayF; break;
+        case Graphic3d_BT_RGB_RayTraceHdrLeft: aFormat = Image_Format_RGBF;  break;
       }
 
       if (!theImage.InitZero (aFormat, Standard_Size(aTargetSize.x()), Standard_Size(aTargetSize.y())))

src/ViewerTest/ViewerTest.cxx

@@ -1079,6 +1079,7 @@ static Standard_Integer VDump (Draw_Interpretor& theDI,
     case Graphic3d_BT_RGB:                 aFormat = Image_Format_RGB;   break;
     case Graphic3d_BT_RGBA:                aFormat = Image_Format_RGBA;  break;
     case Graphic3d_BT_Depth:               aFormat = Image_Format_GrayF; break;
+    case Graphic3d_BT_RGB_RayTraceHdrLeft: aFormat = Image_Format_RGBF;  break;
   }
 
   switch (aStereoPair)