Add IPostProcessWorldShader for custom effect render passes.

OpenRA.Platforms.Default/OpenGL.cs

@@ -442,6 +442,10 @@ namespace OpenRA.Platforms.Default
 			int width, int height, int border, int format, int type, IntPtr pixels);
 		public static TexImage2D glTexImage2D { get; private set; }
 
+		public delegate void CopyTexImage2D(int target, int level, int internalFormat,
+			int x, int y, int width, int height, int border);
+		public static CopyTexImage2D glCopyTexImage2D { get; private set; }
+
 		public delegate void GetTexImage(int target, int level,
 			int format, int type, IntPtr pixels);
 		public static GetTexImage glGetTexImage { get; private set; }
@@ -607,6 +611,7 @@ namespace OpenRA.Platforms.Default
 				glBindTexture = Bind<BindTexture>("glBindTexture");
 				glActiveTexture = Bind<ActiveTexture>("glActiveTexture");
 				glTexImage2D = Bind<TexImage2D>("glTexImage2D");
+				glCopyTexImage2D = Bind<CopyTexImage2D>("glCopyTexImage2D");
 				glTexParameteri = Bind<TexParameteri>("glTexParameteri");
 				glTexParameterf = Bind<TexParameterf>("glTexParameterf");
 

OpenRA.Platforms.Default/Texture.cs

@@ -111,6 +111,19 @@ namespace OpenRA.Platforms.Default
 			}
 		}
 
+		public void SetDataFromReadBuffer(Rectangle rect)
+		{
+			VerifyThreadAffinity();
+			if (!Exts.IsPowerOf2(rect.Width) || !Exts.IsPowerOf2(rect.Height))
+				throw new InvalidDataException($"Non-power-of-two rectangle {rect.Width}x{rect.Height}");
+
+			PrepareTexture();
+
+			var glInternalFormat = OpenGL.Profile == GLProfile.Embedded ? OpenGL.GL_BGRA : OpenGL.GL_RGBA8;
+			OpenGL.glCopyTexImage2D(OpenGL.GL_TEXTURE_2D, 0, glInternalFormat, rect.X, rect.Y, rect.Width, rect.Height, 0);
+			OpenGL.CheckGLError();
+		}
+
 		public byte[] GetData()
 		{
 			VerifyThreadAffinity();

OpenRA.Platforms.Default/ThreadedGraphicsContext.cs

@@ -648,6 +648,7 @@ namespace OpenRA.Platforms.Default
 		readonly Func<object, object> setData2;
 		readonly Action<object> setData3;
 		readonly Func<object, object> setData4;
+		readonly Action<object> setData5;
 		readonly Action dispose;
 
 		public ThreadedTexture(ThreadedGraphicsContext device, ITextureInternal texture)
@@ -663,6 +664,7 @@ namespace OpenRA.Platforms.Default
 			setData2 = tuple => { setData1(tuple); return null; };
 			setData3 = tuple => { var t = ((float[], int, int))tuple; texture.SetFloatData(t.Item1, t.Item2, t.Item3); };
 			setData4 = tuple => { setData3(tuple); return null; };
+			setData5 = rect => texture.SetDataFromReadBuffer((Rectangle)rect);
 			dispose = texture.Dispose;
 		}
 
@@ -725,6 +727,11 @@ namespace OpenRA.Platforms.Default
 			}
 		}
 
+		public void SetDataFromReadBuffer(Rectangle rect)
+		{
+			device.Post(setData5, rect);
+		}
+
 		public void Dispose()
 		{
 			device.Post(dispose);