DirectXTK PrimitiveBatch helper makes it easy to draw user primitives with D3D11

re: DirectXTK PrimitiveBatch helper makes it easy to draw user primitives with D3D11

Pirlo — Tue, 05 Feb 2013 01:08:27 GMT

Shawn you give me a pleasantly surprised by replaying me so quick.I think I should start to learn c++.

I have learn much in your blog and thank you so much!

re: DirectXTK PrimitiveBatch helper makes it easy to draw user primitives with D3D11

Shawn Hargreaves - MSFT — Mon, 04 Feb 2013 16:37:50 GMT

Pirlo - you are thinking like a C# developer :-) There is no need for offset parameters in C++, because you pass the actual data as a pointer rather than an array container, so you can offset that pointer to directly reference whatever sub-block of data you like.

re: DirectXTK PrimitiveBatch helper makes it easy to draw user primitives with D3D11

Pirlo — Mon, 04 Feb 2013 09:01:45 GMT

Is it means that we can't control vertexOffset or indexOffset like this

" public void DrawUserIndexedPrimitives<T>(PrimitiveType primitiveType, T[] vertexData, int vertexOffset, int numVertices, short[] indexData, int indexOffset, int primitiveCount) where T : struct, IVertexType;"

in xna?

re: DirectXTK PrimitiveBatch helper makes it easy to draw user primitives with D3D11

josh — Sun, 11 Nov 2012 18:02:06 GMT

ah, thanks you are right ... my d3d knowledge is a little rusty :)

a tessellated groundplane might be useful for simple vertexshader displaced terrains and flat & slightly deformed objects like leafs.

re: DirectXTK PrimitiveBatch helper makes it easy to draw user primitives with D3D11

Shawn Hargreaves - MSFT — Sat, 10 Nov 2012 21:58:51 GMT

You can use SpriteBatch with a custom pixel shader. Compute shaders are different: they don't involve any actual geometry being rendered so use entirely different APIs to any of this shape drawing stuff.

What would be the benefit of tessellating a ground plane grid, as opposed to just drawing a single larger quad?

re: DirectXTK PrimitiveBatch helper makes it easy to draw user primitives with D3D11

josh — Sat, 10 Nov 2012 15:32:56 GMT

oh okay I haven't looked into SpriteBatch just yet. Can I use compute shaders with it?

Also how about a Grid (with adjustable divisions in u and v direction) as Geometric Primitive. Could be useful for groundplanes.

re: DirectXTK PrimitiveBatch helper makes it easy to draw user primitives with D3D11

Shawn Hargreaves - MSFT — Fri, 09 Nov 2012 21:46:10 GMT

> how about a polygon that matches the windows size for image processing as a Geometric Primitive.

For image processing, SpriteBatch is a better choice than PrimitiveBatch or one of the GeometricPrimitives.h helpers. What more would you want to see there compared to the current SpriteBatch API?

re: DirectXTK PrimitiveBatch helper makes it easy to draw user primitives with D3D11

josh — Fri, 09 Nov 2012 21:43:22 GMT

how about a polygon that matches the windows size for image processing as a Geometric Primitive.

re: DirectXTK PrimitiveBatch helper makes it easy to draw user primitives with D3D11

Amer — Mon, 15 Oct 2012 20:23:35 GMT

Bug I think directX base Vertex means which offset to add when performing index drawing, so it means start from 5, 6, 7, 8 instead of default one which would be 0, 1, 2, 3 etc.

re: DirectXTK PrimitiveBatch helper makes it easy to draw user primitives with D3D11

Bug — Mon, 15 Oct 2012 15:38:16 GMT

Couldn't you just give OpenGL an offset to the base vertex using glVertexPointer() or glVertexAttribPointer()?