From e1ee0bd1381d6b66736fc9ba8b84f369a2e9b6c0 Mon Sep 17 00:00:00 2001
From: sphere <spherallic@gmail.com>
Date: Fri, 19 Nov 2021 18:56:55 +0100
Subject: [PATCH] Reverse subtractive and reverse subtractive.

---
 Source/Core/IO/SRB2MapSetIO.cs      |  3 ++-
 Source/Core/Rendering/Renderer3D.cs | 18 +++++++++---------
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/Source/Core/IO/SRB2MapSetIO.cs b/Source/Core/IO/SRB2MapSetIO.cs
index aacb302..97bfef5 100644
--- a/Source/Core/IO/SRB2MapSetIO.cs
+++ b/Source/Core/IO/SRB2MapSetIO.cs
@@ -77,7 +77,8 @@ namespace CodeImp.DoomBuilder.IO
                 { 936, 0.4f },
                 { 937, 0.3f },
                 { 938, 0.2f },
-                { 939, 0.1f }
+                { 939, 0.1f },
+                { 940, 0.5f }  // modulate, placeholder value
             };
 
             startTypes = new List<int>() { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 };
diff --git a/Source/Core/Rendering/Renderer3D.cs b/Source/Core/Rendering/Renderer3D.cs
index 6d2407c..1cb9e59 100644
--- a/Source/Core/Rendering/Renderer3D.cs
+++ b/Source/Core/Rendering/Renderer3D.cs
@@ -994,14 +994,14 @@ namespace CodeImp.DoomBuilder.Rendering
 							break;
 
 						case RenderPass.Subtractive:
-							graphics.Device.SetRenderState(RenderState.BlendOperation, BlendOperation.ReverseSubtract);
+							graphics.Device.SetRenderState(RenderState.BlendOperation, BlendOperation.Subtract);
 							graphics.Device.SetRenderState(RenderState.SourceBlend, Blend.SourceAlpha);
 							graphics.Device.SetRenderState(RenderState.DestinationBlend, Blend.One);
 							break;
 
 						case RenderPass.ReverseSubtractive:
-							graphics.Device.SetRenderState(RenderState.BlendOperation, BlendOperation.Subtract);
-							graphics.Device.SetRenderState(RenderState.SourceBlend, Blend.InverseSourceAlpha);
+							graphics.Device.SetRenderState(RenderState.BlendOperation, BlendOperation.ReverseSubtract);
+							graphics.Device.SetRenderState(RenderState.SourceBlend, Blend.SourceAlpha);
 							graphics.Device.SetRenderState(RenderState.DestinationBlend, Blend.One);
 							break;
 
@@ -1139,14 +1139,14 @@ namespace CodeImp.DoomBuilder.Rendering
 								break;
 
 							case RenderPass.Subtractive:
-								graphics.Device.SetRenderState(RenderState.BlendOperation, BlendOperation.ReverseSubtract);
+								graphics.Device.SetRenderState(RenderState.BlendOperation, BlendOperation.Subtract);
 								graphics.Device.SetRenderState(RenderState.SourceBlend, Blend.SourceAlpha);
 								graphics.Device.SetRenderState(RenderState.DestinationBlend, Blend.One);
 								break;
 
 							case RenderPass.ReverseSubtractive:
-								graphics.Device.SetRenderState(RenderState.BlendOperation, BlendOperation.Subtract);
-								graphics.Device.SetRenderState(RenderState.SourceBlend, Blend.InverseSourceAlpha);
+								graphics.Device.SetRenderState(RenderState.BlendOperation, BlendOperation.ReverseSubtract);
+								graphics.Device.SetRenderState(RenderState.SourceBlend, Blend.SourceAlpha);
 								graphics.Device.SetRenderState(RenderState.DestinationBlend, Blend.One);
 								break;
 
@@ -1521,14 +1521,14 @@ namespace CodeImp.DoomBuilder.Rendering
 							break;
 
 						case RenderPass.Subtractive:
-							graphics.Device.SetRenderState(RenderState.BlendOperation, BlendOperation.ReverseSubtract);
+							graphics.Device.SetRenderState(RenderState.BlendOperation, BlendOperation.Subtract);
 							graphics.Device.SetRenderState(RenderState.SourceBlend, Blend.SourceAlpha);
 							graphics.Device.SetRenderState(RenderState.DestinationBlend, Blend.One);
 							break;
 
 						case RenderPass.ReverseSubtractive:
-							graphics.Device.SetRenderState(RenderState.BlendOperation, BlendOperation.Subtract);
-							graphics.Device.SetRenderState(RenderState.SourceBlend, Blend.InverseSourceAlpha);
+							graphics.Device.SetRenderState(RenderState.BlendOperation, BlendOperation.ReverseSubtract);
+							graphics.Device.SetRenderState(RenderState.SourceBlend, Blend.SourceAlpha);
 							graphics.Device.SetRenderState(RenderState.DestinationBlend, Blend.One);
 							break;