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#if SHADERPASS != SHADERPASS_LIGHT_TRANSPORT
#error SHADERPASS_is_not_correctly_define
#endif
#include "Color.hlsl"
CBUFFER_START(UnityMetaPass)
// x = use uv1 as raster position
// y = use uv2 as raster position
bool4 unity_MetaVertexControl;
// x = return albedo
// y = return normal
bool4 unity_MetaFragmentControl;
CBUFFER_END
// This was not in constant buffer in original unity, so keep outiside. But should be in as ShaderRenderPass frequency
float unity_OneOverOutputBoost;
float unity_MaxOutputValue;
#include "VertMesh.hlsl"
PackedVaryingsToPS Vert(AttributesMesh inputMesh)
{
VaryingsToPS output;
// Output UV coordinate in vertex shader
if (unity_MetaVertexControl.x)
{
inputMesh.positionOS.xy = inputMesh.uv1 * unity_LightmapST.xy + unity_LightmapST.zw;
// OpenGL right now needs to actually use incoming vertex position,
// so use it in a very dummy way
//v.positionOS.z = vertex.z > 0 ? 1.0e-4f : 0.0f;
}
if (unity_MetaVertexControl.y)
{
inputMesh.positionOS.xy = inputMesh.uv2 * unity_DynamicLightmapST.xy + unity_DynamicLightmapST.zw;
// OpenGL right now needs to actually use incoming vertex position,
// so use it in a very dummy way
//v.positionOS.z = vertex.z > 0 ? 1.0e-4f : 0.0f;
}
float3 positionWS = TransformObjectToWorld(inputMesh.positionOS);
output.vmesh.positionCS = TransformWorldToHClip(positionWS);
output.vmesh.texCoord0 = inputMesh.uv0;
output.vmesh.texCoord1 = inputMesh.uv1;
return PackVaryingsToPS(output);
}
float4 Frag(PackedVaryingsToPS packedInput) : SV_Target
{
FragInputs input = UnpackVaryingsMeshToFragInputs(packedInput.vmesh);
// input.unPositionSS is SV_Position
PositionInputs posInput = GetPositionInput(input.unPositionSS.xy, _ScreenSize.zw);
// No position and depth in case of light transport
float3 V = float3(0, 0, 1); // No vector view in case of light transport
SurfaceData surfaceData;
BuiltinData builtinData;
GetSurfaceAndBuiltinData(input, V, posInput, surfaceData, builtinData);
BSDFData bsdfData = ConvertSurfaceDataToBSDFData(surfaceData);
LighTransportData lightTransportData = GetLightTransportData(surfaceData, builtinData, bsdfData);
// This shader is call two time. Once for getting emissiveColor, the other time to get diffuseColor
// We use unity_MetaFragmentControl to make the distinction.
float4 res = float4(0.0, 0.0, 0.0, 1.0);
// TODO: No if / else in original code from Unity, why ? keep like original code but should be either diffuse or emissive
if (unity_MetaFragmentControl.x)
{
// Apply diffuseColor Boost from LightmapSettings.
// put abs here to silent a warning, no cost, no impact as color is assume to be positive.
res.rgb = Clamp(pow(abs(lightTransportData.diffuseColor), saturate(unity_OneOverOutputBoost)), 0, unity_MaxOutputValue);
}
if (unity_MetaFragmentControl.y)
{
// TODO: THIS LIMIT MUST BE REMOVE, IT IS NOT HDR, change when RGB9e5 is here.
// Do we assume here that emission is [0..1] ?
res = PackEmissiveRGBM(lightTransportData.emissiveColor);
}
return res;
}