Merge pull request #3407 from pchote/voxel-fbo

Voxel refactoring

OpenRA.FileFormats/Exts.cs

@@ -137,6 +137,11 @@ namespace OpenRA
 			return v;
 		}
 
+		public static bool IsPowerOf2(int v)
+		{
+			return (v & (v - 1)) == 0;
+		}
+
 		public static Size NextPowerOf2(this Size s) { return new Size(NextPowerOf2(s.Width), NextPowerOf2(s.Height)); }
 
 		public static string JoinWith<T>(this IEnumerable<T> ts, string j)

OpenRA.FileFormats/Graphics/HvaReader.cs

@@ -19,7 +19,7 @@ namespace OpenRA.FileFormats
 	{
 		public readonly uint FrameCount;
 		public readonly uint LimbCount;
-		float[] Transforms;
+		public readonly float[] Transforms;
 
 		public HvaReader(Stream s)
 		{
@@ -48,19 +48,6 @@ namespace OpenRA.FileFormats
 			}
 		}
 
-		public float[] TransformationMatrix(uint limb, uint frame)
-		{
-			if (frame >= FrameCount)
-				throw new ArgumentOutOfRangeException("frame", "Only {0} frames exist.".F(FrameCount));
-			if (limb >= LimbCount)
-				throw new ArgumentOutOfRangeException("limb", "Only {1} limbs exist.".F(LimbCount));
-
-			var t = new float[16];
-			Array.Copy(Transforms, 16*(LimbCount*frame + limb), t, 0, 16);
-
-			return t;
-		}
-
 		public static HvaReader Load(string filename)
 		{
 			using (var s = File.OpenRead(filename))

OpenRA.FileFormats/Graphics/IGraphicsDevice.cs

@@ -37,6 +37,7 @@ namespace OpenRA.FileFormats.Graphics
 		IVertexBuffer<Vertex> CreateVertexBuffer( int length );
 		ITexture CreateTexture( Bitmap bitmap );
 		ITexture CreateTexture();
+		IFrameBuffer CreateFrameBuffer(Size s);
 		IShader CreateShader( string name );
 
 		Size WindowSize { get; }
@@ -54,8 +55,8 @@ namespace OpenRA.FileFormats.Graphics
 		void EnableDepthBuffer();
 		void DisableDepthBuffer();
 
-		void EnableStencilBuffer();
-		void DisableStencilBuffer();
+		void EnableAlphaBlending();
+		void DisableAlphaBlending();
 	}
 
 	public interface IVertexBuffer<T>
@@ -79,6 +80,15 @@ namespace OpenRA.FileFormats.Graphics
 		void SetData(Bitmap bitmap);
 		void SetData(uint[,] colors);
 		void SetData(byte[] colors, int width, int height);
+		byte[] GetData();
+		Size Size { get; }
+	}
+
+	public interface IFrameBuffer
+	{
+		void Bind();
+		void Unbind();
+		ITexture Texture { get; }
 	}
 
 	public enum PrimitiveType