Working

apps/LoopThroughWithOpenGLCompositing/VideoFrameTransfer.cpp

@@ -72,6 +72,9 @@ bool VideoFrameTransfer::isNvidiaDvpAvailable()
 {
 	// Look for supported graphics boards
 	const GLubyte* renderer = glGetString(GL_RENDERER);
+	if (renderer == NULL)
+		return false;
+
 	bool hasDvp = (strstr((char*)renderer, "Quadro") != NULL);
 	return hasDvp;
 }
@@ -80,6 +83,13 @@ bool VideoFrameTransfer::isAMDPinnedMemoryAvailable()
 {
 	// GL_AMD_pinned_memory presence indicates GL_EXTERNAL_VIRTUAL_MEMORY_BUFFER_AMD buffer target is supported
 	const GLubyte* strExt = glGetString(GL_EXTENSIONS);
+	if (strExt == NULL)
+	{
+		// In a core profile context GL_EXTENSIONS is no longer queryable via glGetString().
+		// Treat this as "extension unavailable" for now; the fast-transfer path is optional.
+		return false;
+	}
+
 	bool hasAMDPinned = (strstr((char*)strExt, "GL_AMD_pinned_memory") != NULL);
 	return hasAMDPinned;
 }