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Fix sampling textures in decals to use custom mip-level

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#3599
This commit is contained in:
Wojtek Figat
2025-08-14 22:14:03 +02:00
parent cb92a2b8cb
commit bf9ca14deb
3 changed files with 72 additions and 12 deletions
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19
Source/Engine/Tools/MaterialGenerator/MaterialGenerator.Textures.cpp
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@@ -34,7 +34,6 @@ MaterialValue* MaterialGenerator::sampleTextureRaw(Node* caller, Value& value, B
const bool isArray = texture->Type == MaterialParameterType::GPUTextureArray;
const bool isVolume = texture->Type == MaterialParameterType::GPUTextureVolume;
const bool isNormalMap = texture->Type == MaterialParameterType::NormalMap;
const bool canUseSample = CanUseSample(_treeType);
MaterialGraphBox* valueBox = parent->GetBox(1);
// Check if has variable assigned
@@ -63,6 +62,16 @@ MaterialValue* MaterialGenerator::sampleTextureRaw(Node* caller, Value& value, B
// Check if hasn't been sampled during that tree eating
if (valueBox->Cache.IsInvalid())
{
bool canUseSample = CanUseSample(_treeType);
String mipLevel = TEXT("0");
const auto layer = GetRootLayer();
if (layer && layer->Domain == MaterialDomain::Decal && _treeType == MaterialTreeType::PixelShader)
{
// Decals use computed mip level due to ddx/ddy being unreliable
canUseSample = false;
mipLevel = String::Format(TEXT("CalculateTextureMipmap(input, {})"), texture->ShaderName);
}
// Check if use custom UVs
String uv;
MaterialGraphBox* uvBox = parent->GetBox(0);
@@ -94,10 +103,10 @@ MaterialValue* MaterialGenerator::sampleTextureRaw(Node* caller, Value& value, B
// Sample texture
if (isNormalMap)
{
const Char* format = canUseSample ? TEXT("{0}.Sample({1}, {2}).xyz") : TEXT("{0}.SampleLevel({1}, {2}, 0).xyz");
const Char* format = canUseSample ? TEXT("{0}.Sample({1}, {2}).xyz") : TEXT("{0}.SampleLevel({1}, {2}, {3}).xyz");
// Sample encoded normal map
const String sampledValue = String::Format(format, texture->ShaderName, sampler, uv);
const String sampledValue = String::Format(format, texture->ShaderName, sampler, uv, mipLevel);
const auto normalVector = writeLocal(VariantType::Float3, sampledValue, parent);
// Decode normal vector
@@ -123,12 +132,12 @@ MaterialValue* MaterialGenerator::sampleTextureRaw(Node* caller, Value& value, B
}
else*/
{
format = canUseSample ? TEXT("{0}.Sample({1}, {2})") : TEXT("{0}.SampleLevel({1}, {2}, 0)");
format = canUseSample ? TEXT("{0}.Sample({1}, {2})") : TEXT("{0}.SampleLevel({1}, {2}, {3})");
}
}
// Sample texture
String sampledValue = String::Format(format, texture->ShaderName, sampler, uv, _ddx.Value, _ddy.Value);
String sampledValue = String::Format(format, texture->ShaderName, sampler, uv, mipLevel);
valueBox->Cache = writeLocal(VariantType::Float4, sampledValue, parent);
}
}