Changed: Parse nvidia-smi output to determine video memory

--HG--
branch : develop

code/nel/src/misc/system_utils.cpp

@@ -601,6 +601,83 @@ sint CSystemUtils::getTotalVideoMemory()
 #elif defined(NL_OS_MAC)
 	// the right method is using OpenGL
 #else
+	if (res == -1)
+	{
+		// use nvidia-smi
+		std::string command = "nvidia-smi -q -d MEMORY";
+
+		std::string out = getCommandOutput(command);
+
+		if (out.empty())
+		{
+			nlwarning("Unable to launch %s", command.c_str());
+		}
+		else
+		{
+			std::vector<std::string> lines;
+			explode(out, std::string("\n"), lines, true);
+	
+			// process each line
+			for(uint i = 0; i < lines.size(); ++i)
+			{
+				//        Total                   : 62 MB
+
+				std::string line = lines[i];
+	
+				// find Total line
+				std::string::size_type pos = line.find("Total");
+				if (pos == std::string::npos) continue;
+				pos += 6;
+
+				// find separator
+				pos = line.find(':', pos);
+				if (pos == std::string::npos) continue;
+				pos += 2;
+
+				// find units
+				std::string::size_type posUnits = line.find(' ', pos);
+				if (posUnits == std::string::npos) continue;
+				++posUnits;
+
+				// found device ID
+				std::string memory = line.substr(pos, posUnits-pos-1);
+				std::string units = line.substr(posUnits);
+
+				// convert video memory to sint
+				if (NLMISC::fromString(memory, res))
+				{
+					if (units == "MB")
+					{
+						res *= 1024;
+					}
+					else if (units == "GB")
+					{
+						res *= 1024 * 1024;
+					}
+					else
+					{
+						// reset to use other methods
+						res = -1;
+
+						nlwarning("nvidia-smi reported %d %s as wrong video memory units", res, units.c_str());
+						break;
+					}
+
+					nlinfo("nvidia-smi reported %d KiB of video memory", res);
+				}
+				else
+				{
+					// reset to use other methods
+					res = -1;
+				}
+
+				break;
+			}
+		}
+	}
+
+	if (res == -1)
+	{
 		// under Linux, no method is really reliable...
 		NLMISC::CIFile file;
 	
@@ -625,6 +702,7 @@ sint CSystemUtils::getTotalVideoMemory()
 				if (pos != std::string::npos)
 				{
 					// [    20.883] (--) NVIDIA(0): Memory: 2097152 kBytes
+					// [    28.515] (--) NVIDIA(0): Memory: 262144 kBytes
 					pos = line.find("Memory: ", pos);
 
 					// found memory line
@@ -669,11 +747,12 @@ sint CSystemUtils::getTotalVideoMemory()
 					break;
 				}
 
-			// TODO: other drivers: nv, fglrx (ATI), radeon (ATI)
+				// TODO: other drivers: fglrx (ATI), radeon (ATI)
 			}
 
 			file.close();
 		}
+	}
 
 	if (res == -1)
 	{