#include "Common.hlsl"

// Raytracing output texture, accessed as a UAV
RWTexture2D<float4> gOutput : register(u0);

RWTexture2D<float4> guiTexture : register(u1);

// Raytracing acceleration structure, accessed as a SRV
RaytracingAccelerationStructure SceneBVH : register(t0);

[shader("raygeneration")]
void RayGen()
{
  // Initialize the ray payload
    HitInfo payload;
    payload.colorAndDistance = float4(0.9, 0.6, 0.2, 1.0);

  // Get the location within the dispatched 2D grid of work items
  // (often maps to pixels, so this could represent a pixel coordinate).
    uint2 launchIndex = DispatchRaysIndex().xy;
  
    float4 guiColor = guiTexture[launchIndex];
    gOutput[launchIndex] = float4(payload.colorAndDistance.rgb * (1 - guiColor.a) + guiColor.rgb * guiColor.a, 1.f);
}