CPU Side:

for i = 1 to m
    C_i= CalculateSplitPositions(i,n, f ,m)
    V_i= SplitViewFrustum(V,C_i-1,C_i)
    M_i = CalculateTextureMatrix(V_i )
    SetViewProjMatrix(M_i)
    RenderToTexture(V_i, T_i)
    C_i= ConvertToClipSpace(C_i)
    SetShaderParams(M_i,T_i,C_i )
end for
SetViewProjMatrix(M_eyeView, M_eyeProj)
RenderShadowedScene(V ) 

GPU side:

texture PSSM1;
texture PSSM2;
texture PSSM3;
sampler PSSM Sampler[3] = {
    sampler_state {
         Texture = <PSSM1>;
        // filtering and addressing modes for all samplers are the same.
        MinFilter = Linear;
        MagFilter = Linear;
        MipFilter = None;
        AddressU = Clamp;
        AddressV = Clamp;
    },
    sampler_state {
        Texture = <PSSM2>;
        ...// filtering and addressing modes.
    },
    sampler_state {
        Texture = <PSSM3>;
        ...// filtering and addressing modes.
    },
};

struct PS_INPUT {
    float4 tex[3] : TEXCOORD
    float4 pos : TEXCOORD4
    float4 color : COLOR0 // diffuse color
    ...// other input data
};

float4 PixelShader_Program(PS_INPUT IN) : COLOR
{
    ...// other statements
    float bias = 0.004;
    bool stop = false;
    float shadow_value = 0;
    for (int i=0; i<3 && !stop; i++){
        if (pos.z/pos.w <= splitPositions[i]) {
            float depth = IN.tex[i].z / IN.tex[i].w;
            float depth_SM = tex2Dproj (PSSM_Sampler[i], IN.tex[i]);
            shadow_value = (depth < depth_SM + bias);
            stop = true;
        }
    }
    return shadow_value * color;
}