I'm trying to recreate the NVidia Cascades demo (sort of) using SlimDX and D3D11 but I keep running into a problem on creating the geometry shaders with stream output.
I'm running the debug runtime, but I'm not seeing any output from that. The only thing I get in the VS output window is: A first chance exception of type 'SlimDX.Direct3D11.Direct3D11Exception' occurred in SlimDX.dll

The unhandled exception window shows up and tells me that the error was an E_INVALIDARG. Which usually indicates an error on the stream output declaration, but I can't for the life of me see what that would be. Any help would be greatly appreciated!

My stream output declaration:
[source]
var sElement = new StreamOutputElement[]
{
new StreamOutputElement(0, "POSITION", 0, 0, 1, 0),
};
[/source]

Bytecode and geometry shader creation code:
[source]
bytecode = ShaderBytecode.CompileFromFile(StringTable.ShaderPath + "list_nonempty.gs",
"GS",
"gs_4_1",
ShaderFlags.Debug,
EffectFlags.None,
null,
includeHandler,
out error);
gShader = new GeometryShader(device, bytecode, sElement, new int[] { 4 }, GeometryShader.NoRasterizedStream);
[/source]

And my geometry shader code:
[source]
struct vs_to_gs
{
uint z8_y8_x8_case8 : OUTPUT;
};

struct gs_to_app
{
uint z8_y8_x8_case8 : POSITION;
};

[maxvertexcount(1)]
void GS(point vs_to_gs input[1], inout PointStream<gs_to_app> Stream)
{
// pull the case out of the input
uint cube_case = input[0].z8_y8_x8_case8 & 0xFF;
// check that the case is not 0
if(cube_case * (255 - cube_case) > 0)
{
// if the case is not zero add this voxel to the output stream
gs_to_app output;
output.z8_y8_x8_case8 = input[0].z8_y8_x8_case8;
Stream.Append(output);
}
}
[/source]

Thanks for the input! I haven't figured out how to get the D3D debug info to show in the output window (I've had it there before, so I'm not sure what happened...)

At any rate I used PIX to get the debug output and got the problem figured out. It was [font="Consolas,"]GeometryShader.NoRasterizedStream[/font] ..... Apparently that only works with D3D11 feature level. I've got a 10.1 card so there has to be a rasterized stream set. I changed it to 0 and it works fine.