#pragma kernel CSMain

RWTexture2D<float> heatmapTexture;
float2 texSize;

StructuredBuffer<float2> enemyPositions;
int enemyCount;

[numthreads(8, 8, 1)]
void CSMain(uint3 id : SV_DispatchThreadID)
{
    int2 pixel = int2(id.xy);
    float2 uv = pixel;
    float heat = 0;

    for (int i = 0; i < enemyCount; i++) {
        float2 enemyPos = enemyPositions[i];
        float dist = distance(uv, enemyPos);
        float radius = 20.0;
        heat += saturate(1.0 - dist / radius); // linear falloff
    }

    heat = saturate(heat);
    heatmapTexture[pixel] = heat;
}