add create vertex buffer for a triangle

GDP/D3D9/main.cpp

@@ -1,4 +1,5 @@
 #include <Windows.h>
+#include <random>
 #include "Window.h"
 #include "Direct3D.h"
 #include "Mesh.h"
@@ -19,6 +20,9 @@ int WINAPI WinMain(
 	const UINT width = 640;
 	const UINT height = 480;
 	const BOOL isFullscreen = FALSE;
+	const BYTE red = 255;
+	const BYTE green = 255;
+	const BYTE blue = 255;
 
 	UINT error = 0; // error code for identifying errors
 
@@ -67,7 +71,11 @@ int WINAPI WinMain(
 		light.update(time.getDeltaTime());
 
 		// 8.2. render objects
-		d3d.beginScene();
+		static std::default_random_engine e;
+		static std::uniform_int_distribution<int> d(0, 255);
+
+		//d3d.beginScene(d(e), d(e), d(e)); //random color
+		d3d.beginScene(red, green, blue);
 
 		light.render(d3d.getDevice());
 		material.render(d3d.getDevice());