GPU Pro 5

3. Particle-Based Simulation of Material Aging 45

void PS_SurfaceUpdate (

in float4 gammaPos : SV_Position , // a t l as pos o f gammaton

in float4 gammaMat : MATERIAL , // material of gammaton

out float4 newMat : SV_Target0 ) // new surface material

{

// get current and initial material on surface

float4 curMat = g_TexMatCur . Load ( gammaPos);

float4 orgMat = g_TexMatOrg . Load ( gammaPos);

// calculate transfer rates and update material

newMat = curMat − transferRate ( curMat , gammaMat);

newMat = max ( orgMat , newMat); // clamp

}

Listing 3.6. Gammatons are expanded to quads in a geometry shader and are splatted

into the atlas. This pixel shader removes ...