cgD3D10BindProgram
Keywords: cgD3D10BindProgram, NVIDIA, NVIDIA Cg Toolkit, Cg Toolkit, Shader, Shader Programming, GPU Shader Programming, GPU Program

> ## Name

> cgD3D10BindProgram - activate a program with D3D

> ## Synopsis

>     #include <Cg/cgD3D10.h>

>     HRESULT cgD3D10BindProgram( CGprogram program );

> ## Parameters

> program
>   The program to activate with D3D.

> ## Return Values

> Returns D3D_OK if the function succeeds.

> Returns the D3D failure code if the function fails due to a D3D call.

> ## Description

> cgD3D10BindProgram activates a program with D3D. The program is activated using ID3D10Device::SetVertexShader or ID3D10Device::SetPixelShader depending on the program's profile type.

> D3D allows only one vertex shader and one pixel shader to be active at any given time, so activating a program of a given type implicitly deactivates any other program of a that type.

> ## Examples

>     // vertexProg and pixelProg are CGprograms initialized elsewhere
>     // pDev is an ID3D10Device interface intialized elsewhere
>     ...
>     HRESULT hr = cgD3D10BindProgram(vertexProg);
>     HRESULT hr2 = cgD3D10BindProgram(pixelProg);
>     // Draw a quad using the vertex and pixel shader
>     // A vertex and index buffer are set up elsewhere.
>     HRESULT hr3 = pDev->DrawIndexedPrimitve(D3DPT_TRIANGLELIST, 0, 4, 0, 2);

> ## Errors

> cgD3D10Failed is generated if a D3D function returns an error.

> CGD3D10ERR_NOTLOADED is returned if program was not loaded with the cgD3D10LoadProgram.

> CGD3D10ERR_NODEVICE is returned if a required D3D device is NULL. This usually occurs when an expanded interface routine is called but a D3D device has not been set with cgD3D10SetDevice.

> ## History

> cgD3D10BindProgram was introduced in Cg 2.1.

> ## See Also

> cgD3D10LoadProgram, cgD3D10SetTextureParameter