#include "Include/PlatformDefines.hlsl"

#pragma kernel CSInstancedCameraCalculationKernel
#pragma kernel CSInstancedCameraCalculationKernelCrossFade

RWStructuredBuffer<uint4> gpuiInstanceLODData; // lodNo - shadowLodNo - cfLodNo - cfLevel 
#include "Include/CullingVR.hlsl"
#include "Include/Camera.hlsl"

[numthreads(GPUI_THREADS, 1, 1)]
void CSInstancedCameraCalculationKernel(uint3 id : SV_DispatchThreadID)
{
    if (id.x >= bufferSize)
        return;

    float dist = 0;
    bool culled = false;
    float size = 0;

    uint4 lodData = uint4(9, 9, 9, 0);
    float4x4 instanceMatrix = gpuiInstanceData[id.x];

    CalculateDistanceAndSize(instanceMatrix, dist, size);
    IsCulledVR(instanceMatrix, dist, culled);
    CalculateLODNo(size, dist, culled, lodData.x, lodData.y);

    gpuiInstanceLODData[id.x] = lodData;
}

[numthreads(GPUI_THREADS, 1, 1)]
void CSInstancedCameraCalculationKernelCrossFade(uint3 id : SV_DispatchThreadID)
{
    if (id.x >= bufferSize)
        return;

    float dist = 0;
    bool culled = false;
    float size = 0;
    
    uint4 lodData = uint4(9, 9, 9, 0);
    float4x4 instanceMatrix = gpuiInstanceData[id.x];

    CalculateDistanceAndSize(instanceMatrix, dist, size);
    IsCulledVR(instanceMatrix, dist, culled);
    CalculateLODNo(size, dist, culled, lodData.x, lodData.y);
#if !SHADER_API_GLCORE && !SHADER_API_GLES3 && !SHADER_API_VULKAN
    if (animateCrossFade)
    {
        uint4 previousLodData = gpuiInstanceLODData[id.x];
        lodData.w = previousLodData.w;
        lodData.z = previousLodData.z;
        CalculateCFLODNoAnimate(previousLodData.x, lodData.x, lodData.z, lodData.w);
    }
    else
        CalculateCFLODNo(size, lodData.x, lodData.z, lodData.w);
#endif
    
    gpuiInstanceLODData[id.x] = lodData;
}