From 853af31fb14e2140d821c7ba1c5c5977072d7662 Mon Sep 17 00:00:00 2001
From: kgv <kgv@opencascade.com>
Date: Mon, 13 May 2019 11:31:42 +0300
Subject: [PATCH] 0030705: Visualization, TKOpenGl - stipple line GLSL error on
 using OpenGL 2.1 + GL_EXT_gpu_shader4 extension on macOS

Fix compatibility with pure GL_EXT_gpu_shader4 specs by defining "uint" as "unsigned int".
---
 src/OpenGl/OpenGl_ShaderManager.cxx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/OpenGl/OpenGl_ShaderManager.cxx b/src/OpenGl/OpenGl_ShaderManager.cxx
index 5544e67f9e..f431e1d8fb 100644
--- a/src/OpenGl/OpenGl_ShaderManager.cxx
+++ b/src/OpenGl/OpenGl_ShaderManager.cxx
@@ -1550,7 +1550,9 @@ int OpenGl_ShaderManager::defaultGlslVersion (const Handle(Graphic3d_ShaderProgr
       }
       else if (myContext->CheckExtension ("GL_EXT_gpu_shader4"))
       {
-        theProgram->SetHeader ("#extension GL_EXT_gpu_shader4 : enable");
+        // GL_EXT_gpu_shader4 defines GLSL type "unsigned int", while core GLSL specs define type "uint"
+        theProgram->SetHeader ("#extension GL_EXT_gpu_shader4 : enable\n"
+                               "#define uint unsigned int");
       }
       else
       {