96 lines
3.3 KiB
C++
96 lines
3.3 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 <MaterialXGenMsl/Nodes/LightNodeMsl.h>
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#include <MaterialXGenShader/Shader.h>
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MATERIALX_NAMESPACE_BEGIN
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namespace
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{
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const string LIGHT_DIRECTION_CALCULATION =
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"float3 L = light.position - position;\n"
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"float distance = length(L);\n"
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"L /= distance;\n"
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"result.direction = L;\n";
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}
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LightNodeMsl::LightNodeMsl()
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{}
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ShaderNodeImplPtr LightNodeMsl::create()
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{
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return std::make_shared<LightNodeMsl>();
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}
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void LightNodeMsl::createVariables(const ShaderNode&, GenContext& context, Shader& shader) const
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{
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ShaderStage& ps = shader.getStage(Stage::PIXEL);
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// Create uniform for intensity, exposure and direction
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VariableBlock& lightUniforms = ps.getUniformBlock(HW::LIGHT_DATA);
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lightUniforms.add(Type::FLOAT, "intensity", Value::createValue<float>(1.0f));
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lightUniforms.add(Type::FLOAT, "exposure", Value::createValue<float>(0.0f));
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lightUniforms.add(Type::VECTOR3, "direction", Value::createValue<Vector3>(Vector3(0.0f, 1.0f, 0.0f)));
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const MslShaderGenerator& shadergen = static_cast<const MslShaderGenerator&>(context.getShaderGenerator());
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shadergen.addStageLightingUniforms(context, ps);
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}
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void LightNodeMsl::emitFunctionCall(const ShaderNode& node, GenContext& context, ShaderStage& stage) const
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{
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DEFINE_SHADER_STAGE(stage, Stage::PIXEL)
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{
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const MslShaderGenerator& shadergen = static_cast<const MslShaderGenerator&>(context.getShaderGenerator());
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shadergen.emitBlock(LIGHT_DIRECTION_CALCULATION, FilePath(), context, stage);
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shadergen.emitLineBreak(stage);
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const ShaderInput* edfInput = node.getInput("edf");
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const ShaderNode* edf = edfInput->getConnectedSibling();
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if (edf)
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{
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shadergen.emitScopeBegin(stage);
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shadergen.emitLine("ClosureData closureData = ClosureData(CLOSURE_TYPE_EMISSION, float3(0), -L, light.direction, float3(0), 0)", stage);
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shadergen.emitFunctionCall(*edf, context, stage);
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shadergen.emitScopeEnd(stage);
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shadergen.emitLineBreak(stage);
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shadergen.emitLineBreak(stage);
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shadergen.emitComment("Apply quadratic falloff and adjust intensity", stage);
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shadergen.emitLine("result.intensity = " + edf->getOutput()->getVariable() + " / (distance * distance)", stage);
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const ShaderInput* intensity = node.getInput("intensity");
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const ShaderInput* exposure = node.getInput("exposure");
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shadergen.emitLineBegin(stage);
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shadergen.emitString("result.intensity *= ", stage);
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shadergen.emitInput(intensity, context, stage);
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shadergen.emitLineEnd(stage);
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// Emit exposure adjustment only if it matters
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if (exposure->getConnection() || (exposure->getValue() && exposure->getValue()->asA<float>() != 0.0f))
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{
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shadergen.emitLineBegin(stage);
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shadergen.emitString("result.intensity *= pow(2, ", stage);
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shadergen.emitInput(exposure, context, stage);
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shadergen.emitString(")", stage);
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shadergen.emitLineEnd(stage);
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}
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}
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else
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{
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shadergen.emitLine("result.intensity = float3(0.0)", stage);
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}
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}
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}
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MATERIALX_NAMESPACE_END
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