Add provoke vertex support.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2593 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/COpenGLDriver.cpp

@@ -569,6 +569,10 @@ bool COpenGLDriver::genericDriverInit(const core::dimension2d<u32>& screenSize,
 	glHint(GL_POINT_SMOOTH_HINT, GL_FASTEST);
 	glDepthFunc(GL_LEQUAL);
 	glFrontFace(GL_CW);
+	// adjust flat coloring scheme to DirectX version
+#if defined(GL_ARB_provoking_vertex) || defined(GL_EXT_provoking_vertex)
+	extGlProvokingVertex(GL_FIRST_VERTEX_CONVENTION_EXT);
+#endif
 
 	UserClipPlane.reallocate(MaxUserClipPlanes);
 	UserClipPlaneEnabled.reallocate(MaxUserClipPlanes);

source/Irrlicht/COpenGLExtensionHandler.cpp

@@ -45,7 +45,8 @@ COpenGLExtensionHandler::COpenGLExtensionHandler() :
 	pGlDrawBuffersARB(0), pGlDrawBuffersATI(0),
 	pGlGenBuffersARB(0), pGlBindBufferARB(0), pGlBufferDataARB(0), pGlDeleteBuffersARB(0),
 	pGlBufferSubDataARB(0), pGlGetBufferSubDataARB(0), pGlMapBufferARB(0), pGlUnmapBufferARB(0),
-	pGlIsBufferARB(0), pGlGetBufferParameterivARB(0), pGlGetBufferPointervARB(0)
+	pGlIsBufferARB(0), pGlGetBufferParameterivARB(0), pGlGetBufferPointervARB(0),
+	pGlProvokingVertexARB(0), pGlProvokingVertexEXT(0)
 
 
 #endif // _IRR_OPENGL_USE_EXTPOINTER_
@@ -187,6 +188,8 @@ void COpenGLExtensionHandler::initExtensions(bool stencilBuffer)
 	pGlIsBufferARB= (PFNGLISBUFFERARBPROC) wglGetProcAddress("glIsBufferARB");
 	pGlGetBufferParameterivARB= (PFNGLGETBUFFERPARAMETERIVARBPROC) wglGetProcAddress("glGetBufferParameterivARB");
 	pGlGetBufferPointervARB= (PFNGLGETBUFFERPOINTERVARBPROC) wglGetProcAddress("glGetBufferPointervARB");
+	pGLProvokingVertexARB= (PFNGLPROVOKINGVERTEXPROC) wglGetProcAddress("glProvokingVertex");
+	pGLProvokingVertexEXT= (PFNGLPROVOKINGVERTEXEXTPROC) wglGetProcAddress("glProvokingVertexEXT");
 
 
 #elif defined(_IRR_COMPILE_WITH_X11_DEVICE_) || defined (_IRR_COMPILE_WITH_SDL_DEVICE_)
@@ -399,6 +402,10 @@ void COpenGLExtensionHandler::initExtensions(bool stencilBuffer)
 
 	pGlGetBufferPointervARB = (PFNGLGETBUFFERPOINTERVARBPROC)
 	IRR_OGL_LOAD_EXTENSION(reinterpret_cast<const GLubyte*>("glGetBufferPointervARB"));
+	pGlProvokingVertexARB= (PFNGLPROVOKINGVERTEXPROC)
+	IRR_OGL_LOAD_EXTENSION(reinterpret_cast<const GLubyte*>("glProvokingVertex"));
+	pGlProvokingVertexEXT= (PFNGLPROVOKINGVERTEXEXTPROC)
+	IRR_OGL_LOAD_EXTENSION(reinterpret_cast<const GLubyte*>("glProvokingVertexEXT"));
 
 
 	#endif // _IRR_OPENGL_USE_EXTPOINTER_

source/Irrlicht/COpenGLExtensionHandler.h

@@ -883,6 +883,7 @@ class COpenGLExtensionHandler
 	GLboolean extGlIsBuffer (GLuint buffer);
 	void extGlGetBufferParameteriv (GLenum target, GLenum pname, GLint *params);
 	void extGlGetBufferPointerv (GLenum target, GLenum pname, GLvoid **params);
+	void extGlProvokingVertex(GLenum mode);
 
 
 	protected:
@@ -951,6 +952,8 @@ class COpenGLExtensionHandler
 		PFNGLISBUFFERARBPROC pGlIsBufferARB;
 		PFNGLGETBUFFERPARAMETERIVARBPROC pGlGetBufferParameterivARB;
 		PFNGLGETBUFFERPOINTERVARBPROC pGlGetBufferPointervARB;
+		PFNGLPROVOKINGVERTEXPROC pGlProvokingVertexARB;
+		PFNGLPROVOKINGVERTEXEXTPROC pGlProvokingVertexEXT;
 	#endif
 };
 
@@ -1645,6 +1648,23 @@ inline void COpenGLExtensionHandler::extGlGetBufferPointerv (GLenum target, GLen
 }
 
 
+inline void COpenGLExtensionHandler::extGlProvokingVertex(GLenum mode)
+{
+#ifdef _IRR_OPENGL_USE_EXTPOINTER_
+	if (pGlProvokingVertexARB)
+		pGlProvokingVertexARB(mode);
+	else if (pGlProvokingVertexEXT)
+		pGlProvokingVertexEXT(mode);
+#elif defined(GL_ARB_provoking_vertex)
+	glProvokingVertex(mode);
+#elif defined(GL_EXT_provoking_vertex)
+	glProvokingVertexEXT(mode);
+#else
+	os::Printer::log("glProvokingVertex not supported", ELL_ERROR);
+#endif
+}
+
+
 }
 }