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#include "LightLoop.cs.hlsl"
#include "../../Sky/SkyVariables.hlsl"
StructuredBuffer<uint> g_vLightListGlobal; // don't support Buffer yet in unity
#define DWORD_PER_TILE 16 // See dwordsPerTile in LightLoop.cs, we have roomm for 31 lights and a number of light value all store on 16 bit (ushort)
CBUFFER_START(UnityTilePass)
uint _NumTileFtplX;
uint _NumTileFtplY;
// these uniforms are only needed for when OPAQUES_ONLY is NOT defined
// but there's a problem with our front-end compilation of compute shaders with multiple kernels causing it to error
//#ifdef USE_CLUSTERED_LIGHTLIST
float4x4 g_mInvScrProjection;
float g_fClustScale;
float g_fClustBase;
float g_fNearPlane;
float g_fFarPlane;
int g_iLog2NumClusters; // We need to always define these to keep constant buffer layouts compatible
uint g_isLogBaseBufferEnabled;
//#endif
//#ifdef USE_CLUSTERED_LIGHTLIST
uint _NumTileClusteredX;
uint _NumTileClusteredY;
CBUFFER_END
StructuredBuffer<uint> g_vLayeredOffsetsBuffer; // don't support Buffer yet in unity
StructuredBuffer<float> g_logBaseBuffer; // don't support Buffer yet in unity
//#endif
StructuredBuffer<DirectionalLightData> _DirectionalLightDatas;
StructuredBuffer<LightData> _LightDatas;
StructuredBuffer<EnvLightData> _EnvLightDatas;
StructuredBuffer<ShadowData> _ShadowDatas;
// Used by directional and spot lights
TEXTURE2D_ARRAY(_CookieTextures);
// Used by point lights
TEXTURECUBE_ARRAY_ABSTRACT(_CookieCubeTextures);
// Use texture array for reflection (or LatLong 2D array for mobile)
TEXTURECUBE_ARRAY_ABSTRACT(_EnvTextures);
TEXTURE2D(_DeferredShadowTexture);
CBUFFER_START(UnityPerLightLoop)
uint _DirectionalLightCount;
uint _PunctualLightCount;
uint _AreaLightCount;
uint _EnvLightCount;
int _EnvLightSkyEnabled; // TODO: make it a bool
CBUFFER_END
// LightLoopContext is not visible from Material (user should not use these properties in Material file)
// It allow the lightloop to have transmit sampling information (do we use atlas, or texture array etc...)
struct LightLoopContext
{
int sampleReflection;
ShadowContext shadowContext;
};
//-----------------------------------------------------------------------------
// Cookie sampling functions
// ----------------------------------------------------------------------------
// Used by directional and spot lights.
float3 SampleCookie2D(LightLoopContext lightLoopContext, float2 coord, int index)
{
// TODO: add MIP maps to combat aliasing?
return SAMPLE_TEXTURE2D_ARRAY_LOD(_CookieTextures, s_linear_clamp_sampler, coord, index, 0).rgb;
}
// Used by point lights.
float3 SampleCookieCube(LightLoopContext lightLoopContext, float3 coord, int index)
{
// TODO: add MIP maps to combat aliasing?
return SAMPLE_TEXTURECUBE_ARRAY_LOD_ABSTRACT(_CookieCubeTextures, s_linear_clamp_sampler, coord, index, 0).rgb;
}
//-----------------------------------------------------------------------------
// Reflection probe / Sky sampling function
// ----------------------------------------------------------------------------
#define SINGLE_PASS_CONTEXT_SAMPLE_REFLECTION_PROBES 0
#define SINGLE_PASS_CONTEXT_SAMPLE_SKY 1
// Note: index is whatever the lighting architecture want, it can contain information like in which texture to sample (in case we have a compressed BC6H texture and an uncompressed for real time reflection ?)
// EnvIndex can also be use to fetch in another array of struct (to atlas information etc...).
float4 SampleEnv(LightLoopContext lightLoopContext, int index, float3 texCoord, float lod)
{
// This code will be inlined as lightLoopContext is hardcoded in the light loop
if (lightLoopContext.sampleReflection == SINGLE_PASS_CONTEXT_SAMPLE_REFLECTION_PROBES)
{
return SAMPLE_TEXTURECUBE_ARRAY_LOD_ABSTRACT(_EnvTextures, s_trilinear_clamp_sampler, texCoord, index, lod);
}
else // SINGLE_PASS_SAMPLE_SKY
{
return SampleSkyTexture(texCoord, lod);
}
}
//-----------------------------------------------------------------------------
// Single Pass and Tile Pass
// ----------------------------------------------------------------------------
#ifdef LIGHTLOOP_TILE_PASS
// Calculate the offset in global light index light for current light category
int GetTileOffset(PositionInputs posInput, uint lightCategory)
{
uint2 tileIndex = posInput.tileCoord;
return (tileIndex.y + lightCategory * _NumTileFtplY) * _NumTileFtplX + tileIndex.x;
}
void GetCountAndStartTile(PositionInputs posInput, uint lightCategory, out uint start, out uint lightCount)
{
const int tileOffset = GetTileOffset(posInput, lightCategory);
// The first entry inside a tile is the number of light for lightCategory (thus the +0)
lightCount = g_vLightListGlobal[DWORD_PER_TILE * tileOffset + 0] & 0xffff;
start = tileOffset;
}
#ifdef USE_FPTL_LIGHTLIST
uint GetTileSize()
{
return TILE_SIZE_FPTL;
}
void GetCountAndStart(PositionInputs posInput, uint lightCategory, out uint start, out uint lightCount)
{
GetCountAndStartTile(posInput, lightCategory, start, lightCount);
}
uint FetchIndex(uint tileOffset, uint lightIndex)
{
const uint lightIndexPlusOne = lightIndex + 1; // Add +1 as first slot is reserved to store number of light
// Light index are store on 16bit
return (g_vLightListGlobal[DWORD_PER_TILE * tileOffset + (lightIndexPlusOne >> 1)] >> ((lightIndexPlusOne & 1) * DWORD_PER_TILE)) & 0xffff;
}
#elif defined(USE_CLUSTERED_LIGHTLIST)
#include "ClusteredUtils.hlsl"
uint GetTileSize()
{
return TILE_SIZE_CLUSTERED;
}
void GetCountAndStartCluster(PositionInputs posInput, uint lightCategory, out uint start, out uint lightCount)
{
uint2 tileIndex = posInput.tileCoord;
float logBase = g_fClustBase;
if (g_isLogBaseBufferEnabled)
{
logBase = g_logBaseBuffer[tileIndex.y * _NumTileClusteredX + tileIndex.x];
}
int clustIdx = SnapToClusterIdxFlex(posInput.linearDepth, logBase, g_isLogBaseBufferEnabled != 0);
int nrClusters = (1 << g_iLog2NumClusters);
const int idx = ((lightCategory * nrClusters + clustIdx) * _NumTileClusteredY + tileIndex.y) * _NumTileClusteredX + tileIndex.x;
uint dataPair = g_vLayeredOffsetsBuffer[idx];
start = dataPair & 0x7ffffff;
lightCount = (dataPair >> 27) & 31;
}
void GetCountAndStart(PositionInputs posInput, uint lightCategory, out uint start, out uint lightCount)
{
GetCountAndStartCluster(posInput, lightCategory, start, lightCount);
}
uint FetchIndex(uint tileOffset, uint lightIndex)
{
return g_vLightListGlobal[tileOffset + lightIndex];
}
#endif // USE_FPTL_LIGHTLIST
#else
uint GetTileSize()
{
return 1;
}
#endif // LIGHTLOOP_TILE_PASS
LightData FetchLight(uint start, uint i)
{
#ifdef LIGHTLOOP_TILE_PASS
int j = FetchIndex(start, i);
#else
int j = start + i;
#endif
return _LightDatas[j];
}