From 1b34c7d6b9aef78b8c182f29cfa3c01cb85d2178 Mon Sep 17 00:00:00 2001
From: Paul Chote <paul@chote.net>
Date: Fri, 22 Feb 2013 23:29:34 +1300
Subject: [PATCH] Expose depth buffer to render code.

---
 OpenRA.FileFormats/Graphics/IGraphicsDevice.cs |  3 +++
 OpenRA.Game/Graphics/Renderer.cs               | 12 ++++++++++++
 OpenRA.Renderer.Null/NullGraphicsDevice.cs     |  3 +++
 OpenRA.Renderer.SdlCommon/SdlGraphics.cs       | 14 ++++++++++++++
 4 files changed, 32 insertions(+)

diff --git a/OpenRA.FileFormats/Graphics/IGraphicsDevice.cs b/OpenRA.FileFormats/Graphics/IGraphicsDevice.cs
index bb57b64c1c..ae7c76df0c 100755
--- a/OpenRA.FileFormats/Graphics/IGraphicsDevice.cs
+++ b/OpenRA.FileFormats/Graphics/IGraphicsDevice.cs
@@ -50,6 +50,9 @@ namespace OpenRA.FileFormats.Graphics
 		void SetLineWidth( float width );
 		void EnableScissor( int left, int top, int width, int height );
 		void DisableScissor();
+
+		void EnableDepthBuffer();
+		void DisableDepthBuffer();
 	}
 
 	public interface IVertexBuffer<T>
diff --git a/OpenRA.Game/Graphics/Renderer.cs b/OpenRA.Game/Graphics/Renderer.cs
index 6509778669..e129851745 100644
--- a/OpenRA.Game/Graphics/Renderer.cs
+++ b/OpenRA.Game/Graphics/Renderer.cs
@@ -186,5 +186,17 @@ namespace OpenRA.Graphics
 			Flush();
 			Device.DisableScissor();
 		}
+
+		public void EnableDepthBuffer()
+		{
+			Flush();
+			Device.EnableDepthBuffer();
+		}
+
+		public void DisableDepthBuffer()
+		{
+			Flush();
+			Device.DisableDepthBuffer();
+		}
 	}
 }
diff --git a/OpenRA.Renderer.Null/NullGraphicsDevice.cs b/OpenRA.Renderer.Null/NullGraphicsDevice.cs
index a98c6db52c..61c7878caf 100644
--- a/OpenRA.Renderer.Null/NullGraphicsDevice.cs
+++ b/OpenRA.Renderer.Null/NullGraphicsDevice.cs
@@ -38,6 +38,9 @@ namespace OpenRA.Renderer.Null
 		public void EnableScissor(int left, int top, int width, int height) { }
 		public void DisableScissor() { }
 
+		public void EnableDepthBuffer() { }
+		public void DisableDepthBuffer() { }
+
 		public void Clear() { }
 		public void Present() { }
 
diff --git a/OpenRA.Renderer.SdlCommon/SdlGraphics.cs b/OpenRA.Renderer.SdlCommon/SdlGraphics.cs
index e274c54a78..ccd7ca08aa 100644
--- a/OpenRA.Renderer.SdlCommon/SdlGraphics.cs
+++ b/OpenRA.Renderer.SdlCommon/SdlGraphics.cs
@@ -133,6 +133,20 @@ namespace OpenRA.Renderer.SdlCommon
 			ErrorHandler.CheckGlError();
 		}
 
+		public void EnableDepthBuffer()
+		{
+			Gl.glClear(Gl.GL_DEPTH_BUFFER_BIT);
+			ErrorHandler.CheckGlError();
+			Gl.glEnable(Gl.GL_DEPTH_TEST);
+			ErrorHandler.CheckGlError();
+		}
+
+		public void DisableDepthBuffer()
+		{
+			Gl.glDisable(Gl.GL_DEPTH_TEST);
+			ErrorHandler.CheckGlError();
+		}
+
 		public void EnableScissor(int left, int top, int width, int height)
 		{
 			if (width < 0) width = 0;