Fix Direct3D9 build clipping when standing next to a block, blocks should not be placed over players. (Thanks Empy)

ClassicalSharp/Game/Game.InputHandling.cs

@@ -168,14 +168,40 @@ namespace ClassicalSharp {
 				Vector3I pos = SelectedPos.TranslatedPos;
 				if( !Map.IsValidPos( pos ) ) return;
 				
-				Block block = inv.HeldBlock;
-				if( !CanPick( Map.GetBlock( pos ) ) && inv.CanPlace[(int)block] ) {					
-					UpdateBlock( pos.X, pos.Y, pos.Z, (byte)block );
-					Network.SendSetBlock( pos.X, pos.Y, pos.Z, true, (byte)block );
+				byte block = (byte)inv.HeldBlock;
+				if( !CanPick( Map.GetBlock( pos ) ) && inv.CanPlace[block] 
+				   && CheckIsFree( pos, block ) ) {
+					UpdateBlock( pos.X, pos.Y, pos.Z, block );
+					Network.SendSetBlock( pos.X, pos.Y, pos.Z, true, block );
 				}
 			}
 		}
 		
+		bool CheckIsFree( Vector3I pos, byte newBlock ) {
+			float height = BlockInfo.Height[newBlock];
+			BoundingBox blockBB = new BoundingBox( pos.X, pos.Y, pos.Z, 
+			                                      pos.X + 1, pos.Y + height, pos.Z + 1 );
+			
+			for( int id = 0; id < 255; id++ ) {
+				Player player = Players[id];
+				if( player == null ) continue;
+				if( player.CollisionBounds.Intersects( blockBB ) ) return false;
+			}
+			
+			BoundingBox localBB = LocalPlayer.CollisionBounds;
+			if( localBB.Intersects( blockBB ) ) {
+				localBB.Min.Y += 0.25f + Entity.Adjustment;
+				if( localBB.Intersects( blockBB ) ) return false;
+				
+				// Push player up if they are jumping and trying to place a block underneath them.
+				Vector3 p = LocalPlayer.Position;
+				p.Y = pos.Y + height + Entity.Adjustment;
+				LocationUpdate update = LocationUpdate.MakePos( p, false );
+				LocalPlayer.SetLocation( update, false );
+			}
+			return true;
+		}
+		
 		void ButtonStateChanged( MouseButton button, bool pressed, byte targetId ) {
 			if( buttonsDown[(int)button] ) {
 				Network.SendPlayerClick( button, false, targetId, SelectedPos );

ClassicalSharp/GraphicsAPI/Direct3D9Api.cs

@@ -31,6 +31,7 @@ namespace ClassicalSharp.GraphicsAPI {
 		CreateFlags createFlags = CreateFlags.HardwareVertexProcessing;
 
 		public Direct3D9Api( Game game ) {
+			MinZNear = 0.05f;
 			IntPtr windowHandle = ((WinWindowInfo)game.WindowInfo).WindowHandle;
 			d3d = new Direct3D();
 			int adapter = d3d.Adapters[0].Adapter;

ClassicalSharp/GraphicsAPI/IGraphicsApi.cs

@@ -17,6 +17,8 @@ namespace ClassicalSharp.GraphicsAPI {
 		
 		public abstract bool Texturing { set; }
 		
+		internal float MinZNear = 0.1f;
+		
 		public int CreateTexture( Bitmap bmp ) {
 			Rectangle rec = new Rectangle( 0, 0, bmp.Width, bmp.Height );
 			// Convert other pixel formats into 32bpp formats.

ClassicalSharp/Physics/BoundingBox.cs

@@ -22,12 +22,12 @@ namespace ClassicalSharp {
 			return new BoundingBox( Min + amount, Max + amount );
 		}
 
-		public bool Intersects( BoundingBox box ) {
-			if( Max.X >= box.Min.X && Min.X <= box.Max.X ) {
-				if( Max.Y < box.Min.Y || Min.Y > box.Max.Y ) {
+		public bool Intersects( BoundingBox other ) {
+			if( Max.X >= other.Min.X && Min.X <= other.Max.X ) {
+				if( Max.Y < other.Min.Y || Min.Y > other.Max.Y ) {
 					return false;
 				}
-				return Max.Z >= box.Min.Z && Min.Z <= box.Max.Z;
+				return Max.Z >= other.Min.Z && Min.Z <= other.Max.Z;
 			}
 			return false;
 		}

ClassicalSharp/Rendering/PickingRenderer.cs

@@ -25,7 +25,7 @@ namespace ClassicalSharp.Renderers {
 			index = 0;
 			Vector3 p1 = pickedPos.Min - new Vector3( offset, offset, offset );
 			Vector3 p2 = pickedPos.Max + new Vector3( offset, offset, offset );
-			col.A = 220;
+			col.A = 150;
 			graphics.AlphaBlending = true;
 			
 			// bottom face

ClassicalSharp/Utils/Camera.cs

@@ -38,7 +38,8 @@ namespace ClassicalSharp {
 		public override Matrix4 GetProjection() {
 			float fovy = (float)Utils.DegreesToRadians( 70 );
 			float aspectRatio = (float)game.Width / game.Height;
-			return Matrix4.CreatePerspectiveFieldOfView( fovy, aspectRatio, 0.1f, game.ViewDistance );
+			float zNear = game.Graphics.MinZNear;
+			return Matrix4.CreatePerspectiveFieldOfView( fovy, aspectRatio, zNear, game.ViewDistance );
 		}
 		
 		public override void GetPickedBlock( PickedPos pos ) {

readme.md

@@ -20,10 +20,10 @@ It **does not** work with 'modern/premium' Minecraft servers.
 Initially, you will need to run launcher.exe to download the required assets from minecraft.net. 
 Just click 'OK' to the dialog box that appears when you start the launcher.
 
-##### Singleplayer
+**Singleplayer**
 Run classicalsharp.exe.
 
-##### Multiplayer
+**Multiplayer**
 Run launcher.exe. You can connect to LAN/locally hosted servers, minecraft.net servers, and classicube.net servers through the launcher.
 
 ##### Mono specific notes