diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index e3f611c40b3..6f2768706f4 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -1238,6 +1238,7 @@ set (PCH_SOURCES
 	common/rendering/hwrenderer/data/hw_aabbtree.cpp
 	common/rendering/hwrenderer/data/hw_shadowmap.cpp
 	common/rendering/hwrenderer/data/hw_shaderpatcher.cpp
+	common/rendering/hwrenderer/postprocessing/hw_postprocessshader.cpp
 	common/rendering/hwrenderer/postprocessing/hw_postprocess.cpp
 	common/rendering/hwrenderer/postprocessing/hw_postprocess_cvars.cpp
 	common/rendering/gl_load/gl_interface.cpp
diff --git a/source/common/rendering/hwrenderer/postprocessing/hw_postprocessshader.cpp b/source/common/rendering/hwrenderer/postprocessing/hw_postprocessshader.cpp
new file mode 100644
index 00000000000..f23d4497f16
--- /dev/null
+++ b/source/common/rendering/hwrenderer/postprocessing/hw_postprocessshader.cpp
@@ -0,0 +1,139 @@
+/*
+**  Postprocessing framework
+**  Copyright (c) 2016-2020 Magnus Norddahl
+**
+**  This software is provided 'as-is', without any express or implied
+**  warranty.  In no event will the authors be held liable for any damages
+**  arising from the use of this software.
+**
+**  Permission is granted to anyone to use this software for any purpose,
+**  including commercial applications, and to alter it and redistribute it
+**  freely, subject to the following restrictions:
+**
+**  1. The origin of this software must not be misrepresented; you must not
+**     claim that you wrote the original software. If you use this software
+**     in a product, an acknowledgment in the product documentation would be
+**     appreciated but is not required.
+**  2. Altered source versions must be plainly marked as such, and must not be
+**     misrepresented as being the original software.
+**  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "vm.h"
+#include "hwrenderer/postprocessing/hw_postprocessshader.h"
+#include "hwrenderer/postprocessing/hw_postprocess.h"
+
+static void ShaderSetEnabled(const FString &shaderName, bool value)
+{
+	for (unsigned int i = 0; i < PostProcessShaders.Size(); i++)
+	{
+		PostProcessShader &shader = PostProcessShaders[i];
+		if (shader.Name == shaderName)
+			shader.Enabled = value;
+	}
+}
+
+DEFINE_ACTION_FUNCTION_NATIVE(_PPShader, SetEnabled, ShaderSetEnabled)
+{
+	PARAM_PROLOGUE;
+	PARAM_STRING(shaderName);
+	PARAM_BOOL(value);
+	ShaderSetEnabled(shaderName, value);
+
+	return 0;
+}
+
+static void ShaderSetUniform1f(const FString &shaderName, const FString &uniformName, double value)
+{
+	for (unsigned int i = 0; i < PostProcessShaders.Size(); i++)
+	{
+		PostProcessShader &shader = PostProcessShaders[i];
+		if (shader.Name == shaderName)
+		{
+			double *vec4 = shader.Uniforms[uniformName].Values;
+			vec4[0] = value;
+			vec4[1] = 0.0;
+			vec4[2] = 0.0;
+			vec4[3] = 1.0;
+		}
+	}
+}
+
+DEFINE_ACTION_FUNCTION_NATIVE(_PPShader, SetUniform1f, ShaderSetUniform1f)
+{
+	PARAM_PROLOGUE;
+	PARAM_STRING(shaderName);
+	PARAM_STRING(uniformName);
+	PARAM_FLOAT(value);
+	ShaderSetUniform1f(shaderName, uniformName, value);
+	return 0;
+}
+
+DEFINE_ACTION_FUNCTION(_PPShader, SetUniform2f)
+{
+	PARAM_PROLOGUE;
+	PARAM_STRING(shaderName);
+	PARAM_STRING(uniformName);
+	PARAM_FLOAT(x);
+	PARAM_FLOAT(y);
+
+	for (unsigned int i = 0; i < PostProcessShaders.Size(); i++)
+	{
+		PostProcessShader &shader = PostProcessShaders[i];
+		if (shader.Name == shaderName)
+		{
+			double *vec4 = shader.Uniforms[uniformName].Values;
+			vec4[0] = x;
+			vec4[1] = y;
+			vec4[2] = 0.0;
+			vec4[3] = 1.0;
+		}
+	}
+	return 0;
+}
+
+DEFINE_ACTION_FUNCTION(_PPShader, SetUniform3f)
+{
+	PARAM_PROLOGUE;
+	PARAM_STRING(shaderName);
+	PARAM_STRING(uniformName);
+	PARAM_FLOAT(x);
+	PARAM_FLOAT(y);
+	PARAM_FLOAT(z);
+
+	for (unsigned int i = 0; i < PostProcessShaders.Size(); i++)
+	{
+		PostProcessShader &shader = PostProcessShaders[i];
+		if (shader.Name == shaderName)
+		{
+			double *vec4 = shader.Uniforms[uniformName].Values;
+			vec4[0] = x;
+			vec4[1] = y;
+			vec4[2] = z;
+			vec4[3] = 1.0;
+		}
+	}
+	return 0;
+}
+
+DEFINE_ACTION_FUNCTION(_PPShader, SetUniform1i)
+{
+	PARAM_PROLOGUE;
+	PARAM_STRING(shaderName);
+	PARAM_STRING(uniformName);
+	PARAM_INT(value);
+
+	for (unsigned int i = 0; i < PostProcessShaders.Size(); i++)
+	{
+		PostProcessShader &shader = PostProcessShaders[i];
+		if (shader.Name == shaderName)
+		{
+			double *vec4 = shader.Uniforms[uniformName].Values;
+			vec4[0] = (double)value;
+			vec4[1] = 0.0;
+			vec4[2] = 0.0;
+			vec4[3] = 1.0;
+		}
+	}
+	return 0;
+}
diff --git a/wadsrc/static/engine/ppshader.zs b/wadsrc/static/engine/ppshader.zs
new file mode 100644
index 00000000000..5c94e7e2305
--- /dev/null
+++ b/wadsrc/static/engine/ppshader.zs
@@ -0,0 +1,8 @@
+struct PPShader native
+{
+	native clearscope static void SetEnabled(string shaderName, bool enable);
+	native clearscope static void SetUniform1f(string shaderName, string uniformName, float value);
+	native clearscope static void SetUniform2f(string shaderName, string uniformName, vector2 value);
+	native clearscope static void SetUniform3f(string shaderName, string uniformName, vector3 value);
+	native clearscope static void SetUniform1i(string shaderName, string uniformName, int value);
+}
diff --git a/wadsrc/static/zscript.txt b/wadsrc/static/zscript.txt
index 5baf89663b7..0782f52118f 100644
--- a/wadsrc/static/zscript.txt
+++ b/wadsrc/static/zscript.txt
@@ -4,6 +4,7 @@ version "4.3"
 #include "zscript/engine/inputevents.zs"
 #include "zscript/engine/dictionary.zs"
 #include "zscript/engine/screenjob.zs"
+#include "zscript/engine/ppshader.zs"
 
 #include "zscript/engine/ui/menu/colorpickermenu.zs"
 #include "zscript/engine/ui/menu/joystickmenu.zs"