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Added Stochastic Sampling material node

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This commit is contained in:
Olly Rybak
2022-12-23 21:04:13 +11:00
parent 5a50656249
commit 5022e05c25
2 changed files with 127 additions and 0 deletions
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109
Source/Engine/Tools/MaterialGenerator/MaterialGenerator.Textures.cpp
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@@ -669,6 +669,115 @@ void MaterialGenerator::ProcessGroupTextures(Box* box, Node* node, Value& value)
_writer.Write(*triplanarTexture);
value = result;
}
case 17:
{
auto textureBox = node->GetBox(0);
auto uvsBox = node->GetBox(1);
Value uvs;
const bool useCustomUVs = uvsBox->HasConnection();
if (useCustomUVs)
{
// Get custom UVs
uvs = eatBox(uvsBox->GetParent<Node>(), uvsBox->FirstConnection());
}
else
{
// Use default UVs
uvs = getUVs;
}
if (!textureBox->HasConnection())
{
// No texture to sample
value = Value::Zero;
break;
}
if (!CanUseSample(_treeType))
{
// Must sample texture in pixel shader
value = Value::Zero;
break;
}
const auto texture = eatBox(textureBox->GetParent<Node>(), textureBox->FirstConnection());
const auto textureParam = findParam(texture.Value);
const bool isNormalMap = textureParam->Type == MaterialParameterType::NormalMap;
auto result = writeLocal(Value::InitForZero(ValueType::Float4), node);
createGradients(node);
auto proceduralSample = String::Format(TEXT(
" {{\n"
" float W1, W2, W3;\n"
" float2 vertex1, vertex2, vertex3;\n"
" float2 uv = {0} * 3.464; // 2 * sqrt (3);\n"
" float2 UV1, UV2, UV3;\n"
" const float2x2 gridToSkewedGrid = float2x2( 1.0, 0.0, -0.57735027, 1.15470054 );\n"
" float2 skewedCoord = mul( gridToSkewedGrid, uv );\n"
" int2 baseId = int2( floor( skewedCoord ) );\n"
" float3 temp = float3( frac( skewedCoord ), 0 );\n"
" temp.z = 1.0 - temp.x - temp.y;\n"
" if ( temp.z > 0.0 )\n"
" {{\n"
" W1 = temp.z;\n"
" W2 = temp.y;\n"
" W3 = temp.x;\n"
" vertex1 = baseId;\n"
" vertex2 = baseId + int2( 0, 1 );\n"
" vertex3 = baseId + int2( 1, 0 );\n"
" }}\n"
" else\n"
" {{\n"
" W1 = -temp.z;\n"
" W2 = 1.0 - temp.y;\n"
" W3 = 1.0 - temp.x;\n"
" vertex1 = baseId + int2( 1, 1 );\n"
" vertex2 = baseId + int2( 1, 0 );\n"
" vertex3 = baseId + int2( 0, 1 );\n"
" }}\n"
" UV1 = {0} + frac( sin( mul( float2x2( 127.1, 311.7, 269.5, 183.3 ), vertex1 ) ) * 43758.5453 );\n"
" UV2 = {0} + frac( sin( mul( float2x2( 127.1, 311.7, 269.5, 183.3 ), vertex2 ) ) * 43758.5453 );\n"
" UV3 = {0} + frac( sin( mul( float2x2( 127.1, 311.7, 269.5, 183.3 ), vertex3 ) ) * 43758.5453 );\n"
" float4 tex1 = {1}.SampleGrad(SamplerLinearWrap, UV1, {2}, {3});\n"
" float4 tex2 = {1}.SampleGrad(SamplerLinearWrap, UV2, {2}, {3});\n"
" float4 tex3 = {1}.SampleGrad(SamplerLinearWrap, UV3, {2}, {3});\n"
),
uvs.Value, // {0}
texture.Value, // {1}
_ddx.Value, // {2}
_ddy.Value // {3}
);
// Decode normal map vector
if (isNormalMap)
{
proceduralSample += String::Format(TEXT(
" tex1.xy = tex1.xy * 2.0 - 1.0;\n"
" tex1.z = sqrt(saturate(1.0 - dot(tex1.xy, tex1.xy))); \n"
" tex2.xy = tex2.xy * 2.0 - 1.0;\n"
" tex2.z = sqrt(saturate(1.0 - dot(tex2.xy, tex2.xy))); \n"
" tex3.xy = tex3.xy * 2.0 - 1.0;\n"
" tex3.z = sqrt(saturate(1.0 - dot(tex3.xy, tex3.xy))); \n"
));
}
proceduralSample += String::Format(TEXT(
" tex1 *= W1;\n"
" tex2 *= W2;\n"
" tex3 *= W3;\n"
" {0} = tex1 + tex2 + tex3;\n"
" }}\n"
),
result.Value // {0}
);
_writer.Write(*proceduralSample);
value = result;
break;
}
default:
break;
}