From ca0c5a4074eebe646bec60585a16d9765b704ba6 Mon Sep 17 00:00:00 2001
From: Vitaut Tryputsin <vitaut.tryputsin@opencascade.com>
Date: Thu, 30 May 2024 13:26:24 +0300
Subject: [PATCH] 0033729: Visualization - Fixed transparency for capping in
 'Graphic3d_RTM_BLEND_OIT' mode

Added changes connected with restoring of color mask (if we store and restore only rgb part, we can miss transparency)
---
 src/OpenGl/OpenGl_CappingAlgo.cxx | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/OpenGl/OpenGl_CappingAlgo.cxx b/src/OpenGl/OpenGl_CappingAlgo.cxx
index 93a9b4c9d3..40b89d1142 100755
--- a/src/OpenGl/OpenGl_CappingAlgo.cxx
+++ b/src/OpenGl/OpenGl_CappingAlgo.cxx
@@ -121,8 +121,8 @@ namespace
       aContext->ShaderManager()->UpdateClippingState();
 
       aContext->core11fwd->glClear (GL_STENCIL_BUFFER_BIT);
-      const bool aColorMaskBack = aContext->SetColorMask (false);
-
+      const NCollection_Vec4<bool> aColorMaskBack = aContext->ColorMaskRGBA();
+      aContext->SetColorMask (false);
       // override aspects, disable culling
       theWorkspace->SetAspects (&theWorkspace->NoneCulling());
       theWorkspace->ApplyAspects();
@@ -164,7 +164,7 @@ namespace
       aContext->ShaderManager()->UpdateClippingState();
 
       // render capping plane using the generated stencil mask
-      aContext->SetColorMask (aColorMaskBack);
+      aContext->SetColorMaskRGBA (aColorMaskBack);
       if (theWorkspace->UseDepthWrite())
       {
         aContext->core11fwd->glDepthMask (GL_TRUE);