diff --git a/code/nel/include/nel/3d/driver.h b/code/nel/include/nel/3d/driver.h
index 3eb5823ca..f118cca84 100644
--- a/code/nel/include/nel/3d/driver.h
+++ b/code/nel/include/nel/3d/driver.h
@@ -297,7 +297,7 @@ public:
 	virtual bool			clearZBuffer(float zval=1) = 0;
 
 	/// Clear the current target surface stencil buffer. The function ignores the viewport settings but uses the scissor.
-	virtual bool			clearStencilBuffer(float stencilval=0) = 0;
+	virtual bool			clearStencilBuffer(sint stencilval=0) = 0;
 
 	/// Set the color mask filter through where the operation done will pass
 	virtual void			setColorMask(bool bRed, bool bGreen, bool bBlue, bool bAlpha) = 0;
diff --git a/code/nel/src/3d/driver/direct3d/driver_direct3d.cpp b/code/nel/src/3d/driver/direct3d/driver_direct3d.cpp
index 864406205..cb92c5fb3 100644
--- a/code/nel/src/3d/driver/direct3d/driver_direct3d.cpp
+++ b/code/nel/src/3d/driver/direct3d/driver_direct3d.cpp
@@ -1952,7 +1952,7 @@ bool CDriverD3D::clearZBuffer(float zval)
 
 // ***************************************************************************
 
-bool CDriverD3D::clearStencilBuffer(float stencilval)
+bool CDriverD3D::clearStencilBuffer(sint stencilval)
 {
 	H_AUTO_D3D(CDriverD3D_clearStencilBuffer);
 	nlassert (_DeviceInterface);
diff --git a/code/nel/src/3d/driver/direct3d/driver_direct3d.h b/code/nel/src/3d/driver/direct3d/driver_direct3d.h
index 1055e105c..f5fca15da 100644
--- a/code/nel/src/3d/driver/direct3d/driver_direct3d.h
+++ b/code/nel/src/3d/driver/direct3d/driver_direct3d.h
@@ -916,7 +916,7 @@ public:
 	// Buffer
 	virtual bool			clear2D(CRGBA rgba);
 	virtual bool			clearZBuffer(float zval=1);
-	virtual bool			clearStencilBuffer(float stencilval=0);
+	virtual bool			clearStencilBuffer(sint stencilval=0);
 	virtual void			setColorMask (bool bRed, bool bGreen, bool bBlue, bool bAlpha);
 	virtual bool			swapBuffers();
 	virtual void			getBuffer (CBitmap &bitmap);	// Only 32 bits back buffer supported
diff --git a/code/nel/src/3d/driver/opengl/driver_opengl.cpp b/code/nel/src/3d/driver/opengl/driver_opengl.cpp
index 474750d2c..5740b1d79 100644
--- a/code/nel/src/3d/driver/opengl/driver_opengl.cpp
+++ b/code/nel/src/3d/driver/opengl/driver_opengl.cpp
@@ -833,10 +833,10 @@ bool CDriverGL::clearZBuffer(float zval)
 }
 
 // --------------------------------------------------
-bool CDriverGL::clearStencilBuffer(float stencilval)
+bool CDriverGL::clearStencilBuffer(sint stencilval)
 {
 	H_AUTO_OGL(CDriverGL_clearStencilBuffer)
-	glClearStencil((int)stencilval);
+	glClearStencil(stencilval);
 
 	glClear(GL_STENCIL_BUFFER_BIT);
 
diff --git a/code/nel/src/3d/driver/opengl/driver_opengl.h b/code/nel/src/3d/driver/opengl/driver_opengl.h
index 57f73b0b6..a1609c1a0 100644
--- a/code/nel/src/3d/driver/opengl/driver_opengl.h
+++ b/code/nel/src/3d/driver/opengl/driver_opengl.h
@@ -354,7 +354,7 @@ public:
 	virtual bool			clear2D(CRGBA rgba);
 
 	virtual bool			clearZBuffer(float zval=1);
-	virtual bool			clearStencilBuffer(float stencilval=0);
+	virtual bool			clearStencilBuffer(sint stencilval=0);
 	virtual void			setColorMask (bool bRed, bool bGreen, bool bBlue, bool bAlpha);
 	virtual void			setDepthRange(float znear, float zfar);
 	virtual	void			getDepthRange(float &znear, float &zfar) const;
diff --git a/code/nel/src/3d/driver/opengl3/driver_opengl.cpp b/code/nel/src/3d/driver/opengl3/driver_opengl.cpp
index 0fae4cf17..09ef3f687 100644
--- a/code/nel/src/3d/driver/opengl3/driver_opengl.cpp
+++ b/code/nel/src/3d/driver/opengl3/driver_opengl.cpp
@@ -534,9 +534,10 @@ bool CDriverGL3::isTextureExist(const ITexture&tex)
 bool CDriverGL3::clear2D(CRGBA rgba)
 {
 	H_AUTO_OGL(CDriverGL3_clear2D)
-	glClearColor((float)rgba.R/255.0f,(float)rgba.G/255.0f,(float)rgba.B/255.0f,(float)rgba.A/255.0f);
 
-	glClear(GL_COLOR_BUFFER_BIT);
+	NLMISC::CRGBAF rgbaf(rgba);
+	GLfloat fv[] = { rgbaf.R, rgbaf.G, rgbaf.B, rgbaf.A };
+	nglClearBufferfv(GL_COLOR, 0, fv);
 
 	return true;
 }
@@ -546,21 +547,18 @@ bool CDriverGL3::clearZBuffer(float zval)
 {
 	H_AUTO_OGL(CDriverGL3_clearZBuffer);
 
-	glClearDepth(zval);
-
 	_DriverGLStates.enableZWrite(true);
-	glClear(GL_DEPTH_BUFFER_BIT);
+	nglClearBufferfv(GL_DEPTH, 0, &zval);
 
 	return true;
 }
 
 // --------------------------------------------------
-bool CDriverGL3::clearStencilBuffer(float stencilval)
+bool CDriverGL3::clearStencilBuffer(sint stencilval)
 {
 	H_AUTO_OGL(CDriverGL3_clearStencilBuffer)
-	glClearStencil((int)stencilval);
 
-	glClear(GL_STENCIL_BUFFER_BIT);
+	nglClearBufferiv(GL_STENCIL, 0, &stencilval);
 
 	return true;
 }
diff --git a/code/nel/src/3d/driver/opengl3/driver_opengl.h b/code/nel/src/3d/driver/opengl3/driver_opengl.h
index 99cb352e8..f1a0f96e9 100644
--- a/code/nel/src/3d/driver/opengl3/driver_opengl.h
+++ b/code/nel/src/3d/driver/opengl3/driver_opengl.h
@@ -333,7 +333,7 @@ public:
 	virtual bool			clear2D(CRGBA rgba);
 
 	virtual bool			clearZBuffer(float zval=1);
-	virtual bool			clearStencilBuffer(float stencilval=0);
+	virtual bool			clearStencilBuffer(sint stencilval=0);
 	virtual void			setColorMask (bool bRed, bool bGreen, bool bBlue, bool bAlpha);
 	virtual void			setDepthRange(float znear, float zfar);
 	virtual	void			getDepthRange(float &znear, float &zfar) const;
diff --git a/code/nel/src/3d/driver/opengl3/driver_opengl_extension.cpp b/code/nel/src/3d/driver/opengl3/driver_opengl_extension.cpp
index be5b36a00..5e6f26e22 100644
--- a/code/nel/src/3d/driver/opengl3/driver_opengl_extension.cpp
+++ b/code/nel/src/3d/driver/opengl3/driver_opengl_extension.cpp
@@ -66,6 +66,11 @@ void (*nglGetProcAddress(const char *procName))()
 // Core 3.30
 PFNGLGETSTRINGIPROC								nglGetStringi;
 
+PFNGLCLEARBUFFERIVPROC							nglClearBufferiv;
+PFNGLCLEARBUFFERUIVPROC							nglClearBufferuiv;
+PFNGLCLEARBUFFERFVPROC							nglClearBufferfv;
+PFNGLCLEARBUFFERFIPROC							nglClearBufferfi;
+
 PFNGLATTACHSHADERPROC							nglAttachShader;
 PFNGLCOMPILESHADERPROC							nglCompileShader;
 PFNGLCREATEPROGRAMPROC							nglCreateProgram;
@@ -356,6 +361,11 @@ static bool	setupEXTTextureFilterAnisotropic(std::vector<const char *> &glext)
 
 static bool setupGLCore(std::vector<const char *> &glext)
 {
+	CHECK_ADDRESS(PFNGLCLEARBUFFERIVPROC, glClearBufferiv);
+	CHECK_ADDRESS(PFNGLCLEARBUFFERUIVPROC, glClearBufferuiv);
+	CHECK_ADDRESS(PFNGLCLEARBUFFERFVPROC, glClearBufferfv);
+	CHECK_ADDRESS(PFNGLCLEARBUFFERFIPROC, glClearBufferfi);
+
 	CHECK_ADDRESS(PFNGLATTACHSHADERPROC, glAttachShader);
 	CHECK_ADDRESS(PFNGLCOMPILESHADERPROC, glCompileShader);
 	CHECK_ADDRESS(PFNGLCREATEPROGRAMPROC, glCreateProgram);
diff --git a/code/nel/src/3d/driver/opengl3/driver_opengl_extension.h b/code/nel/src/3d/driver/opengl3/driver_opengl_extension.h
index 615398b17..64b634cb8 100644
--- a/code/nel/src/3d/driver/opengl3/driver_opengl_extension.h
+++ b/code/nel/src/3d/driver/opengl3/driver_opengl_extension.h
@@ -153,6 +153,11 @@ bool registerGlExtensions(CGlExtensions &ext);
 // Core 3.30
 extern PFNGLGETSTRINGIPROC								nglGetStringi;
 
+extern PFNGLCLEARBUFFERIVPROC							nglClearBufferiv;
+extern PFNGLCLEARBUFFERUIVPROC							nglClearBufferuiv;
+extern PFNGLCLEARBUFFERFVPROC							nglClearBufferfv;
+extern PFNGLCLEARBUFFERFIPROC							nglClearBufferfi;
+
 extern PFNGLATTACHSHADERPROC							nglAttachShader;
 extern PFNGLCOMPILESHADERPROC							nglCompileShader;
 extern PFNGLCREATEPROGRAMPROC							nglCreateProgram;