diff --git a/external/etk b/external/etk
index 45c4fbb9..ceab3d4d 160000
--- a/external/etk
+++ b/external/etk
@@ -1 +1 @@
-Subproject commit 45c4fbb98db6b5b50599dfaef5903d3a78e63f08
+Subproject commit ceab3d4d7d578d818aa7fba11e86fa3557f14d36
diff --git a/sources/ewol/openGL/openGL.cpp b/sources/ewol/openGL/openGL.cpp
index a8ee220a..9adcb4b0 100644
--- a/sources/ewol/openGL/openGL.cpp
+++ b/sources/ewol/openGL/openGL.cpp
@@ -9,6 +9,7 @@
 #include <vector>
 #include <ewol/debug.h>
 #include <ewol/openGL/openGL.h>
+#include <etk/stdTools.h>
 #include <mutex>
 //#define DIRECT_MODE
 /**
@@ -165,6 +166,59 @@ std::ostream& ewol::operator <<(std::ostream& _os, const enum openGL::openGlFlag
 	return _os;
 }
 
+
+std::vector<std::pair<enum ewol::openGL::renderMode, std::string>>& getListRenderMode() {
+	static std::vector<std::pair<enum ewol::openGL::renderMode, std::string>> list = {
+		std::make_pair(ewol::openGL::renderPoint, "POINTS"),
+		std::make_pair(ewol::openGL::renderLine, "LINES"),
+		std::make_pair(ewol::openGL::renderLineStrip, "LINES_STRIP"),
+		std::make_pair(ewol::openGL::renderLineLoop, "LINE_LOOP"),
+		std::make_pair(ewol::openGL::renderTriangle, "TRIANGLE"),
+		std::make_pair(ewol::openGL::renderTriangleStrip, "TRIANGLE_STRIP"),
+		std::make_pair(ewol::openGL::renderTriangleFan, "TRIANGLE_FAN"),
+		std::make_pair(ewol::openGL::renderQuad, "QUAD"),
+		std::make_pair(ewol::openGL::renderQuadStrip, "QUAD_STRIP"),
+		std::make_pair(ewol::openGL::renderPolygon, "POLYGON"),
+	};
+	return list;
+}
+
+
+namespace etk {
+	template<> std::string to_string<ewol::openGL::renderMode>(const ewol::openGL::renderMode& _obj) {
+		for (auto &it : getListRenderMode()) {
+			if (it.first == _obj) {
+				return it.second;
+			}
+		}
+		EWOL_ERROR("Can not convert : " << static_cast<int32_t>(_obj) << " return UNKNOW");
+		return "UNKNOW";
+	}
+	template<> std::u32string to_u32string<ewol::openGL::renderMode>(const ewol::openGL::renderMode& _obj) {
+		return etk::to_u32string(etk::to_string(_obj));
+	}
+	template<> bool from_string<ewol::openGL::renderMode>(ewol::openGL::renderMode& _variableRet, const std::string& _value) {
+		for (auto &it : getListRenderMode()) {
+			if (it.second == _value) {
+				_variableRet = it.first;
+				return true;
+			}
+		}
+		EWOL_WARNING("Can not parse : '" << _value << "' set Triangle default value");
+		_variableRet = ewol::openGL::renderTriangle;
+		return false;
+	}
+	template<> bool from_string<ewol::openGL::renderMode>(ewol::openGL::renderMode& _variableRet, const std::u32string& _value) {
+		return from_string(_variableRet, etk::to_string(_value));
+	}
+};
+
+std::ostream& ewol::operator <<(std::ostream& _os, const enum openGL::renderMode& _obj) {
+	_os << etk::to_string(_obj);
+	return _os;
+}
+
+
 typedef struct {
 	uint32_t curentFlag;
 	GLenum   OGlFlag;
diff --git a/sources/ewol/openGL/openGL.h b/sources/ewol/openGL/openGL.h
index c59da45b..6a0e2bc2 100644
--- a/sources/ewol/openGL/openGL.h
+++ b/sources/ewol/openGL/openGL.h
@@ -141,6 +141,18 @@ namespace ewol {
 			FLAG_ALPHA_TEST = 1<<27, //!< 
 			FLAG_FOG = 1<<28, //!< 
 		};
+		enum renderMode {
+			renderPoint = GL_POINTS,
+			renderLine = GL_LINES,
+			renderLineStrip = GL_LINE_STRIP, //!< Not supported in EWOL (TODO : Later)
+			renderLineLoop = GL_LINE_LOOP,
+			renderTriangle = GL_TRIANGLES,
+			renderTriangleStrip = GL_TRIANGLE_STRIP, //!< Not supported in EWOL (TODO : Later)
+			renderTriangleFan = GL_TRIANGLE_FAN, //!< Not supported in EWOL (TODO : Later)
+			renderQuad = GL_QUADS, //!< Not supported in OpenGL-ES2
+			renderQuadStrip = GL_QUAD_STRIP, //!< Not supported in OpenGL-ES2
+			renderPolygon = GL_POLYGON //!< Not supported in OpenGL-ES2
+		};
 		
 		/**
 		 * @brief enable a flag on the system
@@ -181,6 +193,7 @@ namespace ewol {
 		void reset();
 	};
 	std::ostream& operator <<(std::ostream& _os, const enum openGL::openGlFlags& _obj);
+	std::ostream& operator <<(std::ostream& _os, const enum openGL::renderMode& _obj);
 };