5 files changed, 44 insertions, 1 deletions
diff --git a/indra/llrender/llgl.cpp b/indra/llrender/llgl.cpp
index 096e8e07ab..6ea63809f8 100644
--- a/indra/llrender/llgl.cpp
+++ b/indra/llrender/llgl.cpp
@@ -1055,6 +1055,33 @@ void flush_glerror()
 	glGetError();
 }
 
+//this function outputs gl error to the log file, does not crash the code.
+void log_glerror()
+{
+	if (LL_UNLIKELY(!gGLManager.mInited))
+	{
+		return ;
+	}
+	//  Create or update texture to be used with this data 
+	GLenum error;
+	error = glGetError();
+	while (LL_UNLIKELY(error))
+	{
+		GLubyte const * gl_error_msg = gluErrorString(error);
+		if (NULL != gl_error_msg)
+		{
+			llwarns << "GL Error: " << error << " GL Error String: " << gl_error_msg << llendl ;			
+		}
+		else
+		{
+			// gluErrorString returns NULL for some extensions' error codes.
+			// you'll probably have to grep for the number in glext.h.
+			llwarns << "GL Error: UNKNOWN 0x" << std::hex << error << std::dec << llendl;
+		}
+		error = glGetError();
+	}
+}
+
 void do_assert_glerror()
 {
 	if (LL_UNLIKELY(!gGLManager.mInited))
diff --git a/indra/llrender/llgl.h b/indra/llrender/llgl.h
index b0decc1499..85fab7a0f8 100644
--- a/indra/llrender/llgl.h
+++ b/indra/llrender/llgl.h
@@ -158,6 +158,7 @@ void rotate_quat(LLQuaternion& rotation);
 
 void flush_glerror(); // Flush GL errors when we know we're handling them correctly.
 
+void log_glerror();
 void assert_glerror();
 
 void clear_glerror();
diff --git a/indra/llrender/llimagegl.cpp b/indra/llrender/llimagegl.cpp
index 4ae01a59ff..ac43b53ecc 100644
--- a/indra/llrender/llimagegl.cpp
+++ b/indra/llrender/llimagegl.cpp
@@ -1069,6 +1069,8 @@ BOOL LLImageGL::setSubImageFromFrameBuffer(S32 fb_x, S32 fb_y, S32 x_pos, S32 y_
 			checkTexSize(true) ;
 			llcallstacks << fb_x << " : " << fb_y << " : " << x_pos << " : " << y_pos << " : " << width << " : " << height <<
 				" : " << (S32)mComponents << llcallstacksendl ;
+
+			log_glerror() ;
 		}
 
 		glCopyTexSubImage2D(GL_TEXTURE_2D, 0, fb_x, fb_y, x_pos, y_pos, width, height);
diff --git a/indra/llrender/llrender.cpp b/indra/llrender/llrender.cpp
index 46211f1419..fb2d0bc7a7 100644
--- a/indra/llrender/llrender.cpp
+++ b/indra/llrender/llrender.cpp
@@ -431,6 +431,9 @@ void LLTexUnit::setTextureFilteringOption(LLTexUnit::eTextureFilterOptions optio
 			if (gGL.mMaxAnisotropy < 1.f)
 			{
 				glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &gGL.mMaxAnisotropy);
+
+				llinfos << "gGL.mMaxAnisotropy: " << gGL.mMaxAnisotropy << llendl ;
+				gGL.mMaxAnisotropy = llmax(1.f, gGL.mMaxAnisotropy) ;
 			}
 			glTexParameterf(sGLTextureType[mCurrTexType], GL_TEXTURE_MAX_ANISOTROPY_EXT, gGL.mMaxAnisotropy);
 		}
diff --git a/indra/llrender/llvertexbuffer.cpp b/indra/llrender/llvertexbuffer.cpp
index 5ac5e2e8f4..07ec31dbd5 100644
--- a/indra/llrender/llvertexbuffer.cpp
+++ b/indra/llrender/llvertexbuffer.cpp
@@ -28,7 +28,7 @@
 #include "llmemory.h"
 
 #include <boost/static_assert.hpp>
-
+#include "llsys.h"
 #include "llvertexbuffer.h"
 // #include "llrender.h"
 #include "llglheaders.h"
@@ -909,6 +909,14 @@ U8* LLVertexBuffer::mapBuffer(S32 access)
 
 		if (!mMappedData)
 		{
+			log_glerror();
+
+			//check the availability of memory
+			U32 avail_phy_mem, avail_vir_mem;
+			LLMemoryInfo::getAvailableMemoryKB(avail_phy_mem, avail_vir_mem) ;
+			llinfos << "Available physical mwmory(KB): " << avail_phy_mem << llendl ; 
+			llinfos << "Available virtual memory(KB): " << avail_vir_mem << llendl;
+
 			//--------------------
 			//print out more debug info before crash
 			llinfos << "vertex buffer size: (num verts : num indices) = " << getNumVerts() << " : " << getNumIndices() << llendl ;
@@ -930,6 +938,8 @@ U8* LLVertexBuffer::mapBuffer(S32 access)
 
 		if (!mMappedIndexData)
 		{
+			log_glerror();
+
 			GLint buff;
 			glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING_ARB, &buff);
 			if ((GLuint)buff != mGLIndices)