From 868e404b22a090cd7eb4c00f822b49484f313209 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matthias=20Mail=C3=A4nder?= <matthias@mailaender.name>
Date: Sat, 4 Apr 2015 12:35:03 +0200
Subject: [PATCH] add 2 new blend modes: Multiplicative, DoubleMultiplicative

---
 OpenRA.Game/Graphics/IGraphicsDevice.cs    |  4 +++-
 OpenRA.Renderer.Sdl2/Sdl2GraphicsDevice.cs | 10 ++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/OpenRA.Game/Graphics/IGraphicsDevice.cs b/OpenRA.Game/Graphics/IGraphicsDevice.cs
index fcb356aad0..2fdafe30d2 100755
--- a/OpenRA.Game/Graphics/IGraphicsDevice.cs
+++ b/OpenRA.Game/Graphics/IGraphicsDevice.cs
@@ -44,7 +44,9 @@ namespace OpenRA
 		SoftAdditive,
 		Translucency25,
 		Translucency50,
-		Translucency75
+		Translucency75,
+		Multiplicative,
+		DoubleMultiplicative
 	}
 
 	public interface IGraphicsDevice : IDisposable
diff --git a/OpenRA.Renderer.Sdl2/Sdl2GraphicsDevice.cs b/OpenRA.Renderer.Sdl2/Sdl2GraphicsDevice.cs
index 2c866d194f..a5b749aa23 100755
--- a/OpenRA.Renderer.Sdl2/Sdl2GraphicsDevice.cs
+++ b/OpenRA.Renderer.Sdl2/Sdl2GraphicsDevice.cs
@@ -267,6 +267,16 @@ namespace OpenRA.Renderer.Sdl2
 					ErrorHandler.CheckGlError();
 					GL.BlendColor(1f, 1f, 1f, 0.75f);
 					break;
+				case BlendMode.Multiplicative:
+					GL.Enable(EnableCap.Blend);
+					ErrorHandler.CheckGlError();
+					GL.BlendFunc(BlendingFactorSrc.Zero, BlendingFactorDest.SrcColor);
+					break;
+				case BlendMode.DoubleMultiplicative:
+					GL.Enable(EnableCap.Blend);
+					ErrorHandler.CheckGlError();
+					GL.BlendFunc(BlendingFactorSrc.DstColor, BlendingFactorDest.SrcColor);
+					break;
 			}
 
 			ErrorHandler.CheckGlError();