Introduction to Pixel Shaders - Introduction to 3D Game Programming with DirectX 9.0 - page 324

Note: Since we are using pixel shaders, we will need to remember
to change the compile target to a pixel shader target (e.g., ps_2_0 )
instead of a vertex shader target (e.g., vs_2_0 ). The compile targets
are specified through a parameter of the D3DXCompileShader-
FromFile function. See section 16.2 for details.
18.3.2 Creating a Pixel Shader
Once we have the compiled shader code, we can obtain a pointer to an
IDirect3DPixelShader9 interface, which represents a pixel shader,
using the following method:
HRESULT IDirect3DDevice9::CreatePixelShader(
CONST DWORD *pFunction,
IDirect3DPixelShader9** ppShader
);
pFunction —Pointer to compiled shader code
ppShader —Returns a pointer to an IDirect3DPixelShader9
interface
For example, suppose the variable shader is an ID3DXBuffer that
contains the compiled shader code. Then to obtain an IDirect3D-
PixelShader9 interface, we would write:
IDirect3DPixelShader9* MultiTexPS = 0;
hr = Device->CreatePixelShader(
(DWORD*)shader->GetBufferPointer(),
&MultiTexPS);
Note: To reiterate, the D3DXCompileShaderFromFile is the func-
tion that would return the compiled shader code ( shader ).
18.3.3 Setting a Pixel Shader
After we have obtained a pointer to an IDirect3DPixelShader9
interface that represents our pixel shader, we can enable it using the
following method:
HRESULT IDirect3DDevice9::SetPixelShader(
IDirect3DPixelShader9* pShader
);
The method takes a single parameter where we pass a pointer to the
pixel shader that we wish to enable. To enable the shader we created in
section 18.3.2, we would write:
Device->SetPixelShader(MultiTexPS);
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