#pragma kernel ShadeOpaque_Fptl				SHADE_OPAQUE_ENTRY=ShadeOpaque_Fptl				USE_FPTL_LIGHTLIST=1
#pragma kernel ShadeOpaque_Clustered		SHADE_OPAQUE_ENTRY=ShadeOpaque_Clustered		USE_CLUSTERED_LIGHTLIST=1


#define LIGHTLOOP_TILE_PASS 1
#define LIGHTLOOP_TILE_DIRECT 1
#define LIGHTLOOP_TILE_INDIRECT 1
#define LIGHTLOOP_TILE_ALL 1
#define USE_FPTL_LIGHTLIST 1


//-------------------------------------------------------------------------------------
// Include
//-------------------------------------------------------------------------------------

#include "Common.hlsl"

// Note: We have fix as guidelines that we have only one deferred material (with control of GBuffer enabled). Mean a users that add a new
// deferred material must replace the old one here. If in the future we want to support multiple layout (cause a lot of consistency problem), 
// the deferred shader will require to use multicompile.
#define UNITY_MATERIAL_LIT // Need to be define before including Material.hlsl
#include "Assets/ScriptableRenderLoop/HDRenderPipeline/ShaderConfig.cs.hlsl"
#include "Assets/ScriptableRenderLoop/HDRenderPipeline/ShaderVariables.hlsl"
#include "Assets/ScriptableRenderLoop/HDRenderPipeline/Lighting/Lighting.hlsl" // This include Material.hlsl

//-------------------------------------------------------------------------------------
// variable declaration
//-------------------------------------------------------------------------------------

DECLARE_GBUFFER_TEXTURE(_GBufferTexture);

TEXTURE2D(_CameraDepthTexture);
SAMPLER2D(sampler_CameraDepthTexture);

RWTexture2D<float4> uavOutput;

[numthreads(TILE_SIZE, TILE_SIZE, 1)]
void SHADE_OPAQUE_ENTRY(uint2 dispatchThreadId : SV_DispatchThreadID, uint2 groupId : SV_GroupID)
{
    // input.positionCS is SV_Position
    uint2 pixelCoord = dispatchThreadId;
    PositionInputs posInput = GetPositionInput(pixelCoord.xy, _ScreenSize.zw);
    float depth = LOAD_TEXTURE2D(_CameraDepthTexture, posInput.unPositionSS).x;
    UpdatePositionInput(depth, _InvViewProjMatrix, _ViewProjMatrix, posInput);
    float3 V = GetWorldSpaceNormalizeViewDir(posInput.positionWS);

    FETCH_GBUFFER(gbuffer, _GBufferTexture, posInput.unPositionSS);
    BSDFData bsdfData;
    float3 bakeDiffuseLighting;
    DECODE_FROM_GBUFFER(gbuffer, bsdfData, bakeDiffuseLighting);

    PreLightData preLightData = GetPreLightData(V, posInput, bsdfData);

    float3 diffuseLighting;
    float3 specularLighting;
    LightLoop(V, posInput, preLightData, bsdfData, bakeDiffuseLighting, diffuseLighting, specularLighting);

    uavOutput[pixelCoord] = float4(diffuseLighting + specularLighting, 1.0);
}