Work around non-compliant behavior for Google Maps.

src/OpenGL/libGLESv2/libGLESv2.cpp

@@ -2580,6 +2580,26 @@ void GL_APIENTRY glGetIntegerv(GLenum pname, GLint* params)
 
 	es2::Context *context = es2::getContext();
 
+	if(!context)
+	{
+		ERR("glGetIntegerv() called without current context.");   // Not strictly an error, but probably unintended or attempting to rely on non-compliant behavior
+
+		// This is not spec compliant! When there is no current GL context, functions should
+		// have no side effects. Google Maps queries these values before creating a context,
+		// so we need this as a bug-compatible workaround.
+		switch(pname)
+		{
+		case GL_MAX_TEXTURE_SIZE:                 *params = es2::IMPLEMENTATION_MAX_TEXTURE_SIZE;  return;
+		case GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:   *params = es2::MAX_VERTEX_TEXTURE_IMAGE_UNITS;   return;
+		case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS: *params = es2::MAX_COMBINED_TEXTURE_IMAGE_UNITS; return;
+		case GL_STENCIL_BITS:                     *params = 8;                                     return;
+		case GL_ALIASED_LINE_WIDTH_RANGE:
+			params[0] = (GLint)es2::ALIASED_LINE_WIDTH_RANGE_MIN;
+			params[1] = (GLint)es2::ALIASED_LINE_WIDTH_RANGE_MAX;
+			return;
+		}
+	}
+
 	if(context)
 	{
 		if(!(context->getIntegerv(pname, params)))