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#include "Decal.hlsl"
DECLARE_DBUFFER_TEXTURE(_DBufferTexture);
DecalData FetchDecal(uint start, uint i)
{
#ifdef LIGHTLOOP_TILE_PASS
int j = FetchIndex(start, i);
#else
int j = start + i;
#endif
return _DecalDatas[j];
}
void ApplyBlendNormal(inout float4 dst, inout int matMask, float2 texCoords, int sliceIndex, int mapMask, float3x3 decalToWorld, float blend)
{
float4 src;
src.xyz = mul(decalToWorld, UnpackNormalmapRGorAG(SAMPLE_TEXTURE2D_ARRAY(_DecalAtlas, sampler_DecalAtlas, texCoords, sliceIndex))) * 0.5f + 0.5f;
src.w = blend;
dst.xyz = src.xyz * src.w + dst.xyz * (1.0f - src.w);
dst.w = dst.w * (1.0f - src.w);
matMask |= mapMask;
}
void ApplyBlendDiffuse(inout float4 dst, inout int matMask, float2 texCoords, int sliceIndex, int mapMask, float blend)
{
float4 src = SAMPLE_TEXTURE2D_ARRAY(_DecalAtlas, sampler_DecalAtlas, texCoords, sliceIndex);
src.w *= blend;
dst.xyz = src.xyz * src.w + dst.xyz * (1.0f - src.w);
dst.w = dst.w * (1.0f - src.w);
matMask |= mapMask;
}
void ApplyBlendMask(inout float4 dst, inout int matMask, float2 texCoords, int sliceIndex, int mapMask, float blend)
{
float4 src = SAMPLE_TEXTURE2D_ARRAY(_DecalAtlas, sampler_DecalAtlas, texCoords, sliceIndex);
src.z = src.w;
src.w = blend;
dst.xyz = src.xyz * src.w + dst.xyz * (1.0f - src.w);
dst.w = dst.w * (1.0f - src.w);
matMask |= mapMask;
}
void AddDecalContribution(PositionInputs posInput, inout SurfaceData surfaceData)
{
if(_EnableDBuffer)
{
DecalSurfaceData decalSurfaceData;
int mask = 0;
// the code in the macros, gets moved inside the conditionals by the compiler
FETCH_DBUFFER(DBuffer, _DBufferTexture, posInput.positionSS);
#ifdef _SURFACE_TYPE_TRANSPARENT // forward transparent using clustered decals
uint decalCount, decalStart;
DBuffer0 = float4(0.0f, 0.0f, 0.0f, 1.0f);
DBuffer1 = float4(0.5f, 0.5f, 0.5f, 1.0f);
DBuffer2 = float4(0.0f, 0.0f, 0.0f, 1.0f);
#ifdef LIGHTLOOP_TILE_PASS
GetCountAndStart(posInput, LIGHTCATEGORY_DECAL, decalStart, decalCount);
#else
decalCount = _DecalCount;
decalStart = 0;
#endif
float3 positionWS = GetAbsolutePositionWS(posInput.positionWS);
uint i = 0;
for (i = 0; i < decalCount; i++)
{
DecalData decalData = FetchDecal(decalStart, i);
float3 positionDS = mul(decalData.worldToDecal, float4(positionWS, 1.0)).xyz;
positionDS = positionDS * float3(1.0, -1.0, 1.0) + float3(0.5, 0.0f, 0.5);
float decalBlend = decalData.normalToWorld[0][3];
int diffuseIndex = decalData.normalToWorld[1][3];
int normalIndex = decalData.normalToWorld[2][3];
int maskIndex = decalData.normalToWorld[3][3];
if((all(positionDS.xyz > 0.0f) && all(1.0f - positionDS.xyz > 0.0f))) // clip to decal space
{
if(diffuseIndex != -1)
{
ApplyBlendDiffuse(DBuffer0, mask, positionDS.xz, diffuseIndex, DBUFFERHTILEBIT_DIFFUSE, decalBlend);
}
if(normalIndex != -1)
{
ApplyBlendNormal(DBuffer1, mask, positionDS.xz, normalIndex, DBUFFERHTILEBIT_NORMAL, (float3x3)decalData.normalToWorld, decalBlend);
}
if(maskIndex != -1)
{
ApplyBlendMask(DBuffer2, mask, positionDS.xz, maskIndex, DBUFFERHTILEBIT_MASK, decalBlend);
}
}
}
#else
mask = UnpackByte(LOAD_TEXTURE2D(_DecalHTileTexture, posInput.positionSS / 8));
#endif
DECODE_FROM_DBUFFER(DBuffer, decalSurfaceData);
// using alpha compositing https://developer.nvidia.com/gpugems/GPUGems3/gpugems3_ch23.html
if(mask & DBUFFERHTILEBIT_DIFFUSE)
{
surfaceData.baseColor.xyz = surfaceData.baseColor.xyz * decalSurfaceData.baseColor.w + decalSurfaceData.baseColor.xyz;
}
if(mask & DBUFFERHTILEBIT_NORMAL)
{
surfaceData.normalWS.xyz = normalize(surfaceData.normalWS.xyz * decalSurfaceData.normalWS.w + decalSurfaceData.normalWS.xyz);
}
if(mask & DBUFFERHTILEBIT_MASK)
{
surfaceData.metallic = surfaceData.metallic * decalSurfaceData.mask.w + decalSurfaceData.mask.x;
surfaceData.ambientOcclusion = surfaceData.ambientOcclusion * decalSurfaceData.mask.w + decalSurfaceData.mask.y;
surfaceData.perceptualSmoothness = surfaceData.perceptualSmoothness * decalSurfaceData.mask.w + decalSurfaceData.mask.z;
}
}
}