line rendering - selection box!!

line.fx

@@ -0,0 +1,54 @@
+// OpenRA gui lines shader
+// Author: C. Forbes
+//--------------------------------------------------------
+
+shared float2 Scroll;
+
+shared float2 r1, r2;		// matrix elements
+
+struct VertexIn {
+	float4 Position: POSITION;
+	float2 RG: TEXCOORD0;
+	float2 BA: TEXCOORD1;
+};
+
+struct VertexOut {
+	float4 Position: POSITION;
+	float4 Color: COLOR0;
+};
+
+struct FragmentIn {
+	float4 Color: COLOR0;
+};
+
+VertexOut Simple_vp(VertexIn v) {
+	VertexOut o;
+	float2 p = (v.Position.xy - Scroll.xy) * r1 + r2;
+	o.Position = float4(p.x,p.y,0,1);
+	o.Color.rg = v.RG.xy;
+	o.Color.ba = v.BA.xy;
+	o.Color.a = 1.0f;
+	return o;
+}
+
+const float2 texelOffset = float2( 0, 1.0f/32.0f );
+
+float4 Simple_fp(FragmentIn f) : COLOR0 {
+	return float4(1,1,1,1);
+	//return f.Color;
+}
+
+technique high_quality {
+	pass p0	{
+		AlphaBlendEnable = false;
+		ZWriteEnable = false;
+		ZEnable = false;
+		CullMode = None;
+		FillMode = Wireframe;
+		VertexShader = compile vs_2_0 Simple_vp();
+		PixelShader = compile ps_2_0 Simple_fp();
+		
+		SrcBlend = SrcAlpha;
+		DestBlend = InvSrcAlpha;
+	}
+}