diff --git a/apps/RenderCadenceCompositor/render/runtime/RuntimeShaderParams.cpp b/apps/RenderCadenceCompositor/render/runtime/RuntimeShaderParams.cpp
index dccbf46..622153a 100644
--- a/apps/RenderCadenceCompositor/render/runtime/RuntimeShaderParams.cpp
+++ b/apps/RenderCadenceCompositor/render/runtime/RuntimeShaderParams.cpp
@@ -112,8 +112,8 @@ std::vector<unsigned char> BuildRuntimeShaderGlobalParamsStd140(
 		case ShaderParameterType::Text:
 			break;
 		case ShaderParameterType::Trigger:
-			AppendStd140Int(buffer, 0);
-			AppendStd140Float(buffer, -1000000.0f);
+			AppendStd140Int(buffer, value.numberValues.empty() ? 0 : static_cast<int>(value.numberValues[0]));
+			AppendStd140Float(buffer, value.numberValues.size() > 1 ? static_cast<float>(value.numberValues[1]) : -1000000.0f);
 			break;
 		}
 	}
diff --git a/apps/RenderCadenceCompositor/runtime/RuntimeLayerModel.cpp b/apps/RenderCadenceCompositor/runtime/RuntimeLayerModel.cpp
index 4684323..db86c1d 100644
--- a/apps/RenderCadenceCompositor/runtime/RuntimeLayerModel.cpp
+++ b/apps/RenderCadenceCompositor/runtime/RuntimeLayerModel.cpp
@@ -3,6 +3,7 @@
 #include "RuntimeParameterUtils.h"
 
 #include <algorithm>
+#include <chrono>
 #include <utility>
 
 namespace RenderCadenceCompositor
@@ -156,8 +157,18 @@ bool RuntimeLayerModel::UpdateParameter(const std::string& layerId, const std::s
 	}
 
 	ShaderParameterValue normalizedValue;
-	if (!NormalizeAndValidateParameterValue(*definition, value, normalizedValue, error))
+	if (definition->type == ShaderParameterType::Trigger)
+	{
+		const auto currentIt = layer->parameterValues.find(parameterId);
+		const double previousCount = currentIt == layer->parameterValues.end() || currentIt->second.numberValues.empty()
+			? 0.0
+			: currentIt->second.numberValues.front();
+		normalizedValue.numberValues = { previousCount + 1.0, RuntimeElapsedSeconds() };
+	}
+	else if (!NormalizeAndValidateParameterValue(*definition, value, normalizedValue, error))
+	{
 		return false;
+	}
 
 	layer->parameterValues[parameterId] = normalizedValue;
 	if (layer->renderReady)
@@ -360,4 +371,9 @@ RuntimeLayerReadModel RuntimeLayerModel::ToReadModel(const Layer& layer)
 	readModel.parameterValues = layer.parameterValues;
 	return readModel;
 }
+
+double RuntimeLayerModel::RuntimeElapsedSeconds() const
+{
+	return std::chrono::duration_cast<std::chrono::duration<double>>(std::chrono::steady_clock::now() - mStartTime).count();
+}
 }
diff --git a/apps/RenderCadenceCompositor/runtime/RuntimeLayerModel.h b/apps/RenderCadenceCompositor/runtime/RuntimeLayerModel.h
index 35dcca3..c03e7e2 100644
--- a/apps/RenderCadenceCompositor/runtime/RuntimeLayerModel.h
+++ b/apps/RenderCadenceCompositor/runtime/RuntimeLayerModel.h
@@ -4,6 +4,7 @@
 #include "RuntimeShaderArtifact.h"
 #include "SupportedShaderCatalog.h"
 
+#include <chrono>
 #include <cstdint>
 #include <map>
 #include <string>
@@ -91,8 +92,10 @@ private:
 	static const ShaderParameterDefinition* FindParameterDefinition(const Layer& layer, const std::string& parameterId);
 	std::string AllocateLayerId();
 	static RuntimeLayerReadModel ToReadModel(const Layer& layer);
+	double RuntimeElapsedSeconds() const;
 
 	std::vector<Layer> mLayers;
 	uint64_t mNextLayerNumber = 1;
+	std::chrono::steady_clock::time_point mStartTime = std::chrono::steady_clock::now();
 };
 }
diff --git a/tests/RenderCadenceCompositorRuntimeLayerModelTests.cpp b/tests/RenderCadenceCompositorRuntimeLayerModelTests.cpp
index cdec60e..55f3c75 100644
--- a/tests/RenderCadenceCompositorRuntimeLayerModelTests.cpp
+++ b/tests/RenderCadenceCompositorRuntimeLayerModelTests.cpp
@@ -45,7 +45,8 @@ RenderCadenceCompositor::SupportedShaderCatalog MakeCatalog(std::filesystem::pat
 		"category": "Tests",
 		"entryPoint": "shadeVideo",
 		"parameters": [
-			{ "id": "gain", "label": "Gain", "type": "float", "default": 0.5 }
+			{ "id": "gain", "label": "Gain", "type": "float", "default": 0.5 },
+			{ "id": "drop", "label": "Drop", "type": "trigger" }
 		]
 	})");
 
@@ -166,6 +167,15 @@ void TestLayerControlsUpdateDisplayAndRenderModels()
 	Expect(model.UpdateParameter(firstLayerId, "gain", gainValue, error), "parameter value can be updated");
 	snapshot = model.Snapshot();
 	Expect(snapshot.displayLayers[1].parameterValues.at("gain").numberValues.front() == 0.75, "updated parameter value is visible");
+	JsonValue dropPulse(true);
+	Expect(model.UpdateParameter(firstLayerId, "drop", dropPulse, error), "trigger parameter can be pulsed");
+	snapshot = model.Snapshot();
+	const std::vector<double> firstTrigger = snapshot.displayLayers[1].parameterValues.at("drop").numberValues;
+	Expect(firstTrigger.size() == 2 && firstTrigger[0] == 1.0 && firstTrigger[1] >= 0.0, "trigger pulse increments count and records runtime time");
+	Expect(model.UpdateParameter(firstLayerId, "drop", dropPulse, error), "trigger parameter can be pulsed again");
+	snapshot = model.Snapshot();
+	const std::vector<double> secondTrigger = snapshot.displayLayers[1].parameterValues.at("drop").numberValues;
+	Expect(secondTrigger.size() == 2 && secondTrigger[0] == 2.0 && secondTrigger[1] >= firstTrigger[1], "second trigger pulse increments count again");
 
 	RuntimeShaderArtifact artifact;
 	artifact.layerId = firstLayerId;
diff --git a/tests/RenderCadenceCompositorRuntimeShaderParamsTests.cpp b/tests/RenderCadenceCompositorRuntimeShaderParamsTests.cpp
index bbab7ad..6c53459 100644
--- a/tests/RenderCadenceCompositorRuntimeShaderParamsTests.cpp
+++ b/tests/RenderCadenceCompositorRuntimeShaderParamsTests.cpp
@@ -80,6 +80,15 @@ ShaderParameterDefinition EnumParam()
 	definition.enumOptions = { { "soft", "Soft" }, { "hard", "Hard" } };
 	return definition;
 }
+
+ShaderParameterDefinition TriggerParam()
+{
+	ShaderParameterDefinition definition;
+	definition.id = "drop";
+	definition.label = "Drop";
+	definition.type = ShaderParameterType::Trigger;
+	return definition;
+}
 }
 
 int main()
@@ -90,6 +99,11 @@ int main()
 	artifact.parameterDefinitions.push_back(ColorParam());
 	artifact.parameterDefinitions.push_back(BoolParam());
 	artifact.parameterDefinitions.push_back(EnumParam());
+	artifact.parameterDefinitions.push_back(TriggerParam());
+
+	ShaderParameterValue triggerValue;
+	triggerValue.numberValues = { 3.0, 1.25 };
+	artifact.parameterValues["drop"] = triggerValue;
 
 	const std::vector<unsigned char> buffer = BuildRuntimeShaderGlobalParamsStd140(artifact, 120, 1920, 1080);
 
@@ -104,6 +118,8 @@ int main()
 	Expect(ReadFloat(buffer, 92) == 1.0f, "color default alpha is packed");
 	Expect(ReadInt(buffer, 96) == 1, "bool default is packed as int");
 	Expect(ReadInt(buffer, 100) == 1, "enum default is packed as selected option index");
+	Expect(ReadInt(buffer, 104) == 3, "trigger count is packed as int");
+	Expect(ReadFloat(buffer, 108) == 1.25f, "trigger time is packed after trigger count");
 
 	std::cout << "RenderCadenceCompositorRuntimeShaderParams tests passed.\n";
 	return 0;