74 lines
2.7 KiB
C++
74 lines
2.7 KiB
C++
//
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// Copyright Contributors to the MaterialX Project
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// SPDX-License-Identifier: Apache-2.0
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//
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#include <MaterialXGenShader/Nodes/HwViewDirectionNode.h>
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#include <MaterialXGenShader/Shader.h>
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MATERIALX_NAMESPACE_BEGIN
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ShaderNodeImplPtr HwViewDirectionNode::create()
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{
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return std::make_shared<HwViewDirectionNode>();
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}
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void HwViewDirectionNode::createVariables(const ShaderNode& node, GenContext&, Shader& shader) const
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{
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ShaderStage& vs = shader.getStage(Stage::VERTEX);
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ShaderStage& ps = shader.getStage(Stage::PIXEL);
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addStageInput(HW::VERTEX_INPUTS, Type::VECTOR3, HW::T_IN_POSITION, vs);
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const ShaderInput* spaceInput = node.getInput(SPACE);
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const int space = spaceInput ? spaceInput->getValue()->asA<int>() : OBJECT_SPACE;
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addStageUniform(HW::PRIVATE_UNIFORMS, Type::VECTOR3, HW::T_VIEW_POSITION, ps);
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addStageConnector(HW::VERTEX_DATA, Type::VECTOR3, HW::T_POSITION_WORLD, vs, ps);
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if (space == OBJECT_SPACE || space == MODEL_SPACE)
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{
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addStageUniform(HW::PRIVATE_UNIFORMS, Type::MATRIX44, HW::T_WORLD_INVERSE_TRANSPOSE_MATRIX, ps);
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}
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}
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void HwViewDirectionNode::emitFunctionCall(const ShaderNode& node, GenContext& context, ShaderStage& stage) const
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{
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const HwShaderGenerator& shadergen = static_cast<const HwShaderGenerator&>(context.getShaderGenerator());
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const ShaderInput* spaceInput = node.getInput(SPACE);
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const int space = spaceInput ? spaceInput->getValue()->asA<int>() : OBJECT_SPACE;
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DEFINE_SHADER_STAGE(stage, Stage::VERTEX)
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{
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VariableBlock& vertexData = stage.getOutputBlock(HW::VERTEX_DATA);
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const string prefix = shadergen.getVertexDataPrefix(vertexData);
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ShaderPort* position = vertexData[HW::T_POSITION_WORLD];
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if (!position->isEmitted())
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{
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position->setEmitted();
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shadergen.emitLine(prefix + position->getVariable() + " = hPositionWorld.xyz", stage);
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}
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}
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DEFINE_SHADER_STAGE(stage, Stage::PIXEL)
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{
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VariableBlock& vertexData = stage.getInputBlock(HW::VERTEX_DATA);
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const string prefix = shadergen.getVertexDataPrefix(vertexData);
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shadergen.emitLineBegin(stage);
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shadergen.emitOutput(node.getOutput(), true, false, context, stage);
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ShaderPort* position = vertexData[HW::T_POSITION_WORLD];
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if (space == WORLD_SPACE)
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{
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shadergen.emitString(" = normalize(" + prefix + position->getVariable() + " - " + HW::T_VIEW_POSITION + ")", stage);
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}
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else
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{
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shadergen.emitString(" = normalize((" + HW::T_WORLD_INVERSE_TRANSPOSE_MATRIX + " * vec4(" + prefix + position->getVariable() + " - " + HW::T_VIEW_POSITION + ", 0.0)).xyz)", stage);
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}
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shadergen.emitLineEnd(stage);
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}
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}
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MATERIALX_NAMESPACE_END
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