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__kernel void cl_copy_weigthed_blend(__global const float4 *in,
__global float4 *out)
{
int gid = get_global_id(0);
float4 in_v = in[gid];
out[gid] = in_v;
}
__kernel void cl_weighted_blend(__global const float4 *in,
__global const float4 *aux,
__global float4 *out)
{
int gid = get_global_id(0);
float4 in_v = in[gid];
float4 aux_v = aux[gid];
float4 out_v;
float in_weight;
float aux_weight;
float total_alpha = in_v.w + aux_v.w;
total_alpha = total_alpha == 0 ? 1 : total_alpha;
in_weight = in_v.w / total_alpha;
aux_weight = 1.0f - in_weight;
out_v.xyz = in_weight * in_v.xyz + aux_weight * aux_v.xyz;
out_v.w = total_alpha;
out[gid] = out_v;
}
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