3 files changed, 31 insertions, 5 deletions
diff --git a/indra/llrender/llgl.h b/indra/llrender/llgl.h
index 964495a3ab..d70e764769 100644
--- a/indra/llrender/llgl.h
+++ b/indra/llrender/llgl.h
@@ -424,6 +424,10 @@ const U32 FENCE_WAIT_TIME_NANOSECONDS = 1000;  //1 ms
 class LLGLFence
 {
 public:
+	virtual ~LLGLFence()
+	{
+	}
+
 	virtual void placeFence() = 0;
 	virtual bool isCompleted() = 0;
 	virtual void wait() = 0;
diff --git a/indra/llrender/llrendertarget.cpp b/indra/llrender/llrendertarget.cpp
index cc5c232380..846311a8d0 100644
--- a/indra/llrender/llrendertarget.cpp
+++ b/indra/llrender/llrendertarget.cpp
@@ -163,10 +163,19 @@ bool LLRenderTarget::addColorAttachment(U32 color_fmt)
 	}
 
 	U32 offset = mTex.size();
-	if (offset >= 4 ||
-		(offset > 0 && (mFBO == 0 || !gGLManager.mHasDrawBuffers)))
+
+	if( offset >= 4 )
 	{
-		llerrs << "Too many color attachments!" << llendl;
+		llwarns << "Too many color attachments" << llendl;
+		llassert( offset < 4 );
+		return false;
+	}
+	if( offset > 0 && (mFBO == 0 || !gGLManager.mHasDrawBuffers) )
+	{
+		llwarns << "FBO not used or no drawbuffers available; mFBO=" << (U32)mFBO << " gGLManager.mHasDrawBuffers=" << (U32)gGLManager.mHasDrawBuffers << llendl;
+		llassert(  mFBO != 0 );
+		llassert( gGLManager.mHasDrawBuffers );
+		return false;
 	}
 
 	U32 tex;
diff --git a/indra/llrender/llvertexbuffer.cpp b/indra/llrender/llvertexbuffer.cpp
index eadef93c89..2fe0aa0b72 100644
--- a/indra/llrender/llvertexbuffer.cpp
+++ b/indra/llrender/llvertexbuffer.cpp
@@ -555,8 +555,21 @@ void LLVertexBuffer::drawArrays(U32 mode, const std::vector<LLVector3>& pos, con
 	gGL.syncMatrices();
 
 	U32 count = pos.size();
-	llassert_always(norm.size() >= pos.size());
-	llassert_always(count > 0);
+	
+	llassert(norm.size() >= pos.size());
+	llassert(count > 0);
+
+	if( count == 0 )
+	{
+		llwarns << "Called drawArrays with 0 vertices" << llendl;
+		return;
+	}
+
+	if( norm.size() < pos.size() )
+	{
+		llwarns << "Called drawArrays with #" << norm.size() << " normals and #" << pos.size() << " vertices" << llendl;
+		return;
+	}
 
 	unbind();