fixes scissor and partly fixes chrome-shp transparency.

OpenRa.Gl/GraphicsDevice.cs

@@ -13,6 +13,7 @@ namespace OpenRa.GlRenderer
 {
     public class GraphicsDevice
     {
+		Size windowSize;
         Graphics g;
         internal IntPtr dc;
         internal IntPtr rc;
@@ -28,6 +29,7 @@ namespace OpenRa.GlRenderer
 
         public GraphicsDevice(Control control, int width, int height, bool fullscreen, bool vsync)
         {
+			windowSize = new Size( width, height );
             g = control.CreateGraphics();
             dc = g.GetHdc();
             
@@ -75,7 +77,7 @@ namespace OpenRa.GlRenderer
         {
 			if( width < 0 ) width = 0;
 			if( height < 0 ) height = 0;
-            Gl.glScissor(left, top, width, height);
+			Gl.glScissor( left, windowSize.Height - ( top + height ), width, height );
             CheckGlError();
             Gl.glEnable(Gl.GL_SCISSOR_TEST);
             CheckGlError();

chrome-shp.fx

@@ -57,10 +57,14 @@ float4 Palette_fp(VertexOut f) : COLOR0 {
 
 technique low_quality {
 	pass p0 {
-		BlendEnable = false;
+		BlendEnable = true;
 		DepthTestEnable = false;
 		CullFaceEnable = false;
 		VertexProgram = compile latest Simple_vp();
 		FragmentProgram = compile latest Palette_fp();
+
+		BlendEquation = FuncAdd;
+		BlendFunc = int2( SrcAlpha, OneMinusSrcAlpha );
 	}
 }
+