SL-17124 switchContext and loadShaderFile crashes

- Do not try initializing shaders if requirements are not met or if window does not exist
- Warn user before closing window. Situation is unexpected, there is chance of more issues, like a freeze or a crash on close()
- mHasMultitexture is a solid requirement, if it is not present, we won't be able to run

1 files changed, 7 insertions, 0 deletions

diff --git a/indra/newview/llviewershadermgr.cpp b/indra/newview/llviewershadermgr.cpp
index 1cb2c6b9ee..086b433c72 100644
--- a/indra/newview/llviewershadermgr.cpp
+++ b/indra/newview/llviewershadermgr.cpp
@@ -426,6 +426,13 @@ void LLViewerShaderMgr::setShaders()
         return;
     }
 
+    if (!gGLManager.mHasRequirements)
+    {
+        // Viewer will show 'hardware requirements' warning later
+        LL_INFOS("ShaderLoading") << "Not supported hardware/software" << LL_ENDL;
+        return;
+    }
+
     static LLCachedControl<U32> max_texture_index(gSavedSettings, "RenderMaxTextureIndex", 16);
     LLGLSLShader::sIndexedTextureChannels = llmax(llmin(gGLManager.mNumTextureImageUnits, (S32) max_texture_index), 1);