Files
UnrealEngine/Engine/Source/ThirdParty/MaterialX/MaterialX-1.38.10/source/MaterialXGenShader/Nodes/HwPositionNode.cpp
2025-05-18 13:04:45 +08:00

88 lines
2.9 KiB
C++

//
// Copyright Contributors to the MaterialX Project
// SPDX-License-Identifier: Apache-2.0
//
#include <MaterialXGenShader/Nodes/HwPositionNode.h>
#include <MaterialXGenShader/Shader.h>
MATERIALX_NAMESPACE_BEGIN
ShaderNodeImplPtr HwPositionNode::create()
{
return std::make_shared<HwPositionNode>();
}
void HwPositionNode::createVariables(const ShaderNode& node, GenContext&, Shader& shader) const
{
ShaderStage vs = shader.getStage(Stage::VERTEX);
ShaderStage ps = shader.getStage(Stage::PIXEL);
addStageInput(HW::VERTEX_INPUTS, Type::VECTOR3, HW::T_IN_POSITION, vs);
const ShaderInput* spaceInput = node.getInput(SPACE);
const int space = spaceInput ? spaceInput->getValue()->asA<int>() : OBJECT_SPACE;
if (space == WORLD_SPACE)
{
addStageConnector(HW::VERTEX_DATA, Type::VECTOR3, HW::T_POSITION_WORLD, vs, ps);
}
else
{
addStageConnector(HW::VERTEX_DATA, Type::VECTOR3, HW::T_POSITION_OBJECT, vs, ps);
}
}
void HwPositionNode::emitFunctionCall(const ShaderNode& node, GenContext& context, ShaderStage& stage) const
{
const HwShaderGenerator& shadergen = static_cast<const HwShaderGenerator&>(context.getShaderGenerator());
const ShaderInput* spaceInput = node.getInput(SPACE);
const int space = spaceInput ? spaceInput->getValue()->asA<int>() : OBJECT_SPACE;
DEFINE_SHADER_STAGE(stage, Stage::VERTEX)
{
VariableBlock& vertexData = stage.getOutputBlock(HW::VERTEX_DATA);
const string prefix = shadergen.getVertexDataPrefix(vertexData);
if (space == WORLD_SPACE)
{
ShaderPort* position = vertexData[HW::T_POSITION_WORLD];
if (!position->isEmitted())
{
position->setEmitted();
shadergen.emitLine(prefix + position->getVariable() + " = hPositionWorld.xyz", stage);
}
}
else
{
ShaderPort* position = vertexData[HW::T_POSITION_OBJECT];
if (!position->isEmitted())
{
position->setEmitted();
shadergen.emitLine(prefix + position->getVariable() + " = " + HW::T_IN_POSITION, stage);
}
}
}
DEFINE_SHADER_STAGE(stage, Stage::PIXEL)
{
VariableBlock& vertexData = stage.getInputBlock(HW::VERTEX_DATA);
const string prefix = shadergen.getVertexDataPrefix(vertexData);
shadergen.emitLineBegin(stage);
shadergen.emitOutput(node.getOutput(), true, false, context, stage);
if (space == WORLD_SPACE)
{
const ShaderPort* position = vertexData[HW::T_POSITION_WORLD];
shadergen.emitString(" = " + prefix + position->getVariable(), stage);
}
else
{
const ShaderPort* position = vertexData[HW::T_POSITION_OBJECT];
shadergen.emitString(" = " + prefix + position->getVariable(), stage);
}
shadergen.emitLineEnd(stage);
}
}
MATERIALX_NAMESPACE_END