[IronPython] XNA and how to specify the type arguments explicitly
A newbie here. I am trying to use the XNA infrastructure to render some data, since all I need is points and colored triangles and a movable camera. Code snippet: def SetupVerticies(self): l = Array.CreateInstance(VertexPositionColor,6) l[0] = VertexPositionColor(Vector3(0., 0., 0.), Color.White) l[1] = VertexPositionColor(Vector3(5., 0., 0.), Color.White) l[2] = VertexPositionColor(Vector3(10., 0., 0.), Color.White) l[3] = VertexPositionColor(Vector3(5., 0., -5.), Color.White) l[4] = VertexPositionColor(Vector3(0., 0., 0.), Color.White) l[5] = VertexPositionColor(Vector3(10., 0., -5.), Color.White) self.vertices = l def CopyTerrainToGraphicsBuffers(self): self.VertexBuffer = VertexBuffer(self.graphics.GraphicsDevice, \ len(self.vertices) * VertexPositionColor.SizeInBytes, \ BufferUsage.WriteOnly) self.VertexBuffer.SetData(self.vertices) This dies with: TypeError: The type arguments for method 'SetData' cannot be inferred from the usage. Try specifying the type arguments explicitly. Any idea how to do this ? ___ Users mailing list Users@lists.ironpython.com http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
Re: [IronPython] XNA and how to specify the type arguments explicitly
On 02/02/2010 10:23, Richard Steventon wrote: A newbie here. I am trying to use the XNA infrastructure to render some data, since all I need is points and colored triangles and a movable camera. Code snippet: def SetupVerticies(self): l = Array.CreateInstance(VertexPositionColor,6) l[0] = VertexPositionColor(Vector3(0., 0., 0.), Color.White) l[1] = VertexPositionColor(Vector3(5., 0., 0.), Color.White) l[2] = VertexPositionColor(Vector3(10., 0., 0.), Color.White) l[3] = VertexPositionColor(Vector3(5., 0., -5.), Color.White) l[4] = VertexPositionColor(Vector3(0., 0., 0.), Color.White) l[5] = VertexPositionColor(Vector3(10., 0., -5.), Color.White) self.vertices = l def CopyTerrainToGraphicsBuffers(self): self.VertexBuffer = VertexBuffer(self.graphics.GraphicsDevice, \ len(self.vertices) * VertexPositionColor.SizeInBytes, \ BufferUsage.WriteOnly) self.VertexBuffer.SetData(self.vertices) This dies with: TypeError: The type arguments for method 'SetData' cannot be inferred from the usage. Try specifying the type arguments explicitly. Any idea how to do this ? Try this: self.VertexBuffer.SetData[Array[VertexPositionColor]](self.vertices) Michael ___ Users mailing list Users@lists.ironpython.com http://lists.ironpython.com/listinfo.cgi/users-ironpython.com -- http://www.ironpythoninaction.com/ http://www.voidspace.org.uk/blog READ CAREFULLY. By accepting and reading this email you agree, on behalf of your employer, to release me from all obligations and waivers arising from any and all NON-NEGOTIATED agreements, licenses, terms-of-service, shrinkwrap, clickwrap, browsewrap, confidentiality, non-disclosure, non-compete and acceptable use policies (”BOGUS AGREEMENTS”) that I have entered into with your employer, its partners, licensors, agents and assigns, in perpetuity, without prejudice to my ongoing rights and privileges. You further represent that you have the authority to release me from any BOGUS AGREEMENTS on behalf of your employer. ___ Users mailing list Users@lists.ironpython.com http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
Re: [IronPython] XNA and how to specify the type arguments explicitly
Okay, so problem #2 calling the correct version of the interface (I think this is the problem?), since I am getting a violates the constraint of type 'T' error. I set up a XNA VertexBuffer using: l = Array.CreateInstance(VertexPositionColor,6) . self.vertices = l Then: self.VertexBuffer = VertexBuffer(self.graphics.GraphicsDevice, \ len(self.vertices) * VertexPositionColor.SizeInBytes, \ BufferUsage.WriteOnly) self.VertexBuffer.SetData[Array[VertexPositionColor]](self.vertices) And I get: ValueError: GenericArguments[0], 'Microsoft.Xna.Framework.Graphics.VertexPositionColor[]', on 'Void SetData[T](Int32, T[], Int32, Int32, Int32)' violates the constraint of type 'T'. The documentation for the VertexBuffer.SetData method can be found here: http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.graphics.vertexbuffer.setdata.aspx The methods are: VertexBuffer.SetData (Int32, T[], Int32, Int32, Int32) VertexBuffer.SetData (T[]) VertexBuffer.SetData (T[], Int32, Int32) This works fine in C# with a List of VertexPositionColor objects, so I assume that Array in IronPython is the equivalent ? So why does it not work ? ___ Users mailing list Users@lists.ironpython.com http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
Re: [IronPython] XNA and how to specify the type arguments explicitly
You should template on VertexPositionColor, not on VertexPositionColor[]. The reason for the error message is that you're saying T is VertexPositionColor[]. An array is a reference type, while the template constraint specifies a value type. On Tue, Feb 2, 2010 at 7:51 AM, Richard Steventon steven...@gmail.comwrote: Okay, so problem #2 calling the correct version of the interface (I think this is the problem?), since I am getting a violates the constraint of type 'T' error. I set up a XNA VertexBuffer using: l = Array.CreateInstance(VertexPositionColor,6) . self.vertices = l Then: self.VertexBuffer = VertexBuffer(self.graphics.GraphicsDevice, \ len(self.vertices) * VertexPositionColor.SizeInBytes, \ BufferUsage.WriteOnly) self.VertexBuffer.SetData[Array[VertexPositionColor]](self.vertices) And I get: ValueError: GenericArguments[0], 'Microsoft.Xna.Framework.Graphics.VertexPositionColor[]', on 'Void SetData[T](Int32, T[], Int32, Int32, Int32)' violates the constraint of type 'T'. The documentation for the VertexBuffer.SetData method can be found here: http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.graphics.vertexbuffer.setdata.aspx The methods are: VertexBuffer.SetData (Int32, T[], Int32, Int32, Int32) VertexBuffer.SetData (T[]) VertexBuffer.SetData (T[], Int32, Int32) This works fine in C# with a List of VertexPositionColor objects, so I assume that Array in IronPython is the equivalent ? So why does it not work ? ___ Users mailing list Users@lists.ironpython.com http://lists.ironpython.com/listinfo.cgi/users-ironpython.com ___ Users mailing list Users@lists.ironpython.com http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
