shaders: Implement hud shaders for OpenGL.

res/gamedata/shaders/gl/hud3d.vs

@@ -0,0 +1,13 @@
+#include "common.h"
+#include "iostructs\v_TL.h"
+
+v2p_TL _main (v_TL I)
+{
+	v2p_TL	O;
+
+	O.Tex0		= I.Tex0;
+	O.HPos		= I.P;
+	O.P.w		= 1;
+	O.P			= mul( m_WVP, O.P );
+	return 		O;
+}

res/gamedata/shaders/gl/hud_crosshair.vs

@@ -0,0 +1,25 @@
+#include "common_iostructs.h"
+//#include "common.h"
+#include "iostructs\v2p_TL0uv.h"
+
+uniform float4		screen_res;		// Screen resolution (x-Width,y-Height, zw - 1/resolution)
+
+//////////////////////////////////////////////////////////////////////////////////////////
+// Vertex
+v2p_TL0uv _main ( v_TL0uv I )
+{
+	v2p_TL0uv O;
+
+	{
+		I.P.xy += 0.5f;
+//		O.HPos.x = I.P.x/1024 * 2 - 1;
+//		O.HPos.y = (I.P.y/768 * 2 - 1)*-1;
+		O.HPos.x = I.P.x * screen_res.z * 2 - 1;
+		O.HPos.y = (I.P.y * screen_res.w * 2 - 1)*-1;
+		O.HPos.zw = I.P.zw;
+	}
+
+	O.Color = I.Color.bgra;	//	swizzle vertex colour
+
+ 	return O;
+}