Reading from Streamout Object as Buffer fails

[aconstlink]

When reading from a streamout_object bound as a buffer to a HLSL shader for data access, there seems to be missing some data. This is not the case when using a buffer from an array_object. The image is from a more complex test that uses nsl and performs a particle simulation loop using a streamout/feedback shader.

The left side shows the d3d11 version where some particles(points) are missing as the data is rendered using quads and read from a buffer.

• checked the number of rendered quads -> ok
• checked the generated shader -> ok
• checked data buffer binding -> potential error

This should be fixed immediately due to the streamout techniques central usability.

[aconstlink]

The error was due to a wrong setting in the D3D11_SHADER_RESOURCE_VIEW_DESCs buffer field, where the number of elements needed to be set to the number of elements in the streamout buffer times the number of layout elements.

res_desc.Buffer.NumElements = UINT( obj.size() * obj.get_buffer(i).get_num_layout_elements() ) ;