DetectGLVendors: detect GL4ES translation layer and underlying technology

Author: illwieckz

src/engine/renderer/DetectGLVendors.cpp

@@ -73,6 +73,7 @@ std::string GetGLDriverVendorName( glDriverVendor_t driverVendor )
 		"Mesa",
 		"Nvidia",
 		"Moore Threads",
+		"GL4ES",
 		"OutOfRange",
 	};
 
@@ -89,6 +90,16 @@ std::string GetGLDriverVendorName( glDriverVendor_t driverVendor )
 	return driverVendorNames[ index ];
 }
 
+static std::string StripPrefix( const std::string &prefix, const std::string &string )
+{
+	if ( Str::IsPrefix( prefix, string ) )
+	{
+		return string.substr( prefix.length() );
+	}
+
+	return string;
+}
+
 void DetectGLVendors(
 	const std::string& vendorString,
 	const std::string& versionString,
@@ -309,4 +320,39 @@ void DetectGLVendors(
 		hardwareVendor = glHardwareVendor_t::INTEL;
 		return;
 	}
+
+	// Newer GL4ES strings disclosing the underlying technology.
+	if ( Str::IsPrefix( "GL4ES wrapping ", vendorString ) )
+	{
+		std::string subVendorString = StripPrefix( "GL4ES wrapping ", vendorString );
+		std::string subRendererString = StripPrefix( "GL4ES using ", rendererString );
+		DetectGLVendors( subVendorString, versionString, subRendererString, hardwareVendor, driverVendor );
+		driverVendor = glDriverVendor_t::GL4ES;
+	}
+
+	/* Older GL4ES string not disclosing the underlying technology,
+	also had “ptitSeb” as vendorString. */
+	if ( rendererString == "GL4ES wrapper" )
+	{
+		driverVendor = glDriverVendor_t::GL4ES;
+		// Older GL4ES doesn't disclose the underlying hardware.
+		if ( hardwareVendor == glHardwareVendor_t::UNKNOWN )
+		{
+			hardwareVendor = glHardwareVendor_t::TRANSLATION;
+		}
+		return;
+	}
+
+	/* GL4ES always use such kind of version string:
+	> 2.1 gl4es wrapper 1.1.7
+	And this is unlikely to change. */
+	if ( versionString.find( "gl4es wrapper" ) != std::string::npos )
+	{
+		driverVendor = glDriverVendor_t::GL4ES;
+		if ( hardwareVendor == glHardwareVendor_t::UNKNOWN )
+		{
+			hardwareVendor = glHardwareVendor_t::TRANSLATION;
+		}
+		return;
+	}
 }

src/engine/renderer/DetectGLVendors.h

@@ -69,6 +69,7 @@ enum class glDriverVendor_t
 	MESA,
 	NVIDIA,
 	MTHREADS,
+	GL4ES,
 	NUM_DRIVER_VENDORS,
 };