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Minimum stream stride

Started by DonnieDarko Aug 26, 2006 at 1:35 PM 3 replies 1.3k views

Original Post

Aug 26, 2006 at 1:35 PM

Can anybody tell me if there is a minimum allowed stream stride? I tried creating a vertex buffer with just 1 float per vertex element and when setting this on stream 1 the runtime says "(ERROR) :Stream 1 size is too small". I haven't found anything in the docs about this and there doesn't seem to be a device cap either.

bakery2k1

Aug 26, 2006 at 1:46 PM

What did you set the stride to?

DonnieDarko

Aug 26, 2006 at 1:56 PM

This is my vertex declaration:

D3DVERTEXELEMENT9 vertexElements[] ={	{ 0, 0, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_POSITION, 0 },	{ 0, 12, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 0 },	{ 0, 24, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 1 },	{ 1, 0, D3DDECLTYPE_FLOAT1, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 2 },	D3DDECL_END()};

And for rendering:

dev->SetStreamSource(0, vb0, 0, mesh->GetNumBytesPerVertex());dev->SetStreamSource(1, vb1, 0, sizeof(float));

In this case I want to render a mesh and then per frame upload one float per vertex.

DonnieDarko

Aug 26, 2006 at 5:49 PM

Nevermind....it was an error related to the use of SetStreamSourceFreq which I found out is not supported on my X800 XT :(

Bye bye instancing...

ET3D

Aug 26, 2006 at 6:35 PM

Instancing is supported on all Radeon SM2 cards. But since the D3D standard supports instancing only on SM3, it's disabled by default, and enabled via a hack. The Radeon SDK (available on ATI's site) has a sample of instancing. It also has some cool render to VB demos which are worth seeing. Another source for instancing code on ATI is Humus' instancing sample.

Note, however, that because instancing is only officially supported on SM3, you will not be able to run ATI SM2 instancing code with the debug runtime, since it validates the call. It will run fine with the retail runtime, however.

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