From 26c6456c8ea969b8ae9e2de5877ffd70d4f451bc Mon Sep 17 00:00:00 2001
From: baldurk <baldurk@baldurk.org>
Date: Thu, 1 Feb 2018 16:17:13 +0000
Subject: [PATCH] Don't query GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS if no
 subroutines

* Works around some mesa debug message spam if no subroutines exist.
---
 renderdoc/driver/gl/gl_renderstate.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/renderdoc/driver/gl/gl_renderstate.cpp b/renderdoc/driver/gl/gl_renderstate.cpp
index a66fc146a..03473129e 100644
--- a/renderdoc/driver/gl/gl_renderstate.cpp
+++ b/renderdoc/driver/gl/gl_renderstate.cpp
@@ -907,6 +907,12 @@ void GLRenderState::FetchState(WrappedOpenGL *gl)
       if(prog == 0)
         continue;
 
+      GLint numSubroutines = 0;
+      m_Real->glGetProgramStageiv(prog, shs[s], eGL_ACTIVE_SUBROUTINES, &numSubroutines);
+
+      if(numSubroutines == 0)
+        continue;
+
       m_Real->glGetProgramStageiv(prog, shs[s], eGL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS,
                                   &Subroutines[s].numSubroutines);