diff --git a/wadsrc/static/engine/shaders/pp/ssao.fp b/wadsrc/static/engine/shaders/pp/ssao.fp
new file mode 100644
index 000000000..b3ab1178c
--- /dev/null
+++ b/wadsrc/static/engine/shaders/pp/ssao.fp
@@ -0,0 +1,123 @@
+
+layout(location=0) in vec2 TexCoord;
+layout(location=0) out vec4 FragColor;
+
+layout(binding=0) uniform sampler2D DepthTexture;
+
+#if defined(MULTISAMPLE)
+layout(binding=1) uniform sampler2DMS NormalTexture;
+#else
+layout(binding=1) uniform sampler2D NormalTexture;
+#endif
+
+#if defined(USE_RANDOM_TEXTURE)
+layout(binding=2) uniform sampler2D RandomTexture;
+#endif
+
+#define PI 3.14159265358979323846
+
+// Calculate eye space position for the specified texture coordinate
+vec3 FetchViewPos(vec2 uv)
+{
+	float z = texture(DepthTexture, uv).x;
+    return vec3((UVToViewA * uv + UVToViewB) * z, z);
+}
+
+#if defined(MULTISAMPLE)
+vec3 SampleNormal(vec2 uv)
+{
+	ivec2 texSize = textureSize(NormalTexture);
+	ivec2 ipos = ivec2(uv * vec2(texSize));
+	return texelFetch(NormalTexture, ipos, SampleIndex).xyz * 2.0 - 1.0;
+}
+#else
+vec3 SampleNormal(vec2 uv)
+{
+	ivec2 texSize = textureSize(NormalTexture, 0);
+	ivec2 ipos = ivec2(uv * vec2(texSize));
+	return texelFetch(NormalTexture, ipos, 0).xyz * 2.0 - 1.0;
+}
+#endif
+
+// Look up the eye space normal for the specified texture coordinate
+vec3 FetchNormal(vec2 uv)
+{
+	vec3 normal = SampleNormal(Offset + uv * Scale);
+	if (length(normal) > 0.1)
+	{
+		normal = normalize(normal);
+		normal.z = -normal.z;
+		return normal;
+	}
+	else
+	{
+		return vec3(0.0);
+	}
+}
+
+// Compute normalized 2D direction
+vec2 RotateDirection(vec2 dir, vec2 cossin)
+{
+    return vec2(dir.x * cossin.x - dir.y * cossin.y, dir.x * cossin.y + dir.y * cossin.x);
+}
+
+vec4 GetJitter()
+{
+#if !defined(USE_RANDOM_TEXTURE)
+    return vec4(1,0,1,1);
+	//vec3 rand = noise3(TexCoord.x + TexCoord.y);
+	//float angle = 2.0 * PI * rand.x / NUM_DIRECTIONS;
+	//return vec4(cos(angle), sin(angle), rand.y, rand.z);
+#else
+    return texture(RandomTexture, gl_FragCoord.xy / RANDOM_TEXTURE_WIDTH);
+#endif
+}
+
+// Calculates the ambient occlusion of a sample
+float ComputeSampleAO(vec3 kernelPos, vec3 normal, vec3 samplePos)
+{
+	vec3 v = samplePos - kernelPos;
+	float distanceSquare = dot(v, v);
+	float nDotV = dot(normal, v) * inversesqrt(distanceSquare);
+	return clamp(nDotV - NDotVBias, 0.0, 1.0) * clamp(distanceSquare * NegInvR2 + 1.0, 0.0, 1.0);
+}
+
+// Calculates the total ambient occlusion for the entire fragment
+float ComputeAO(vec3 viewPosition, vec3 viewNormal)
+{
+    vec4 rand = GetJitter();
+
+	float radiusPixels = RadiusToScreen / viewPosition.z;
+	float stepSizePixels = radiusPixels / (NUM_STEPS + 1.0);
+
+	const float directionAngleStep = 2.0 * PI / NUM_DIRECTIONS;
+	float ao = 0.0;
+
+    for (float directionIndex = 0.0; directionIndex < NUM_DIRECTIONS; ++directionIndex)
+    {
+        float angle = directionAngleStep * directionIndex;
+
+        vec2 direction = RotateDirection(vec2(cos(angle), sin(angle)), rand.xy);
+        float rayPixels = (rand.z * stepSizePixels + 1.0);
+
+        for (float StepIndex = 0.0; StepIndex < NUM_STEPS; ++StepIndex)
+        {
+            vec2 sampleUV = round(rayPixels * direction) * InvFullResolution + TexCoord;
+            vec3 samplePos = FetchViewPos(sampleUV);
+            ao += ComputeSampleAO(viewPosition, viewNormal, samplePos);
+            rayPixels += stepSizePixels;
+        }
+    }
+
+    ao *= AOMultiplier / (NUM_DIRECTIONS * NUM_STEPS);
+    return clamp(1.0 - ao * 2.0, 0.0, 1.0);
+}
+
+void main()
+{
+    vec3 viewPosition = FetchViewPos(TexCoord);
+	vec3 viewNormal = FetchNormal(TexCoord);
+	float occlusion = viewNormal != vec3(0.0) ? ComputeAO(viewPosition, viewNormal) * AOStrength + (1.0 - AOStrength) : 1.0;
+
+	FragColor = vec4(occlusion, viewPosition.z, 0.0, 1.0);
+}
diff --git a/wadsrc/static/engine/shaders/pp/ssaocombine.fp b/wadsrc/static/engine/shaders/pp/ssaocombine.fp
new file mode 100644
index 000000000..0d592549f
--- /dev/null
+++ b/wadsrc/static/engine/shaders/pp/ssaocombine.fp
@@ -0,0 +1,41 @@
+
+layout(location=0) in vec2 TexCoord;
+layout(location=0) out vec4 FragColor;
+
+layout(binding=0) uniform sampler2D AODepthTexture;
+
+#if defined(MULTISAMPLE)
+layout(binding=1) uniform sampler2DMS SceneFogTexture;
+#else
+layout(binding=1) uniform sampler2D SceneFogTexture;
+#endif
+
+void main()
+{
+	vec2 uv = Offset + TexCoord * Scale;
+
+#if defined(MULTISAMPLE)
+	ivec2 texSize = textureSize(SceneFogTexture);
+#else
+	ivec2 texSize = textureSize(SceneFogTexture, 0);
+#endif
+	ivec2 ipos = ivec2(uv * vec2(texSize));
+
+#if defined(MULTISAMPLE)
+	vec3 fogColor = texelFetch(SceneFogTexture, ipos, 0).rgb;
+#else
+	vec3 fogColor = texelFetch(SceneFogTexture, ipos, 0).rgb;
+#endif
+
+	vec4 ssao = texture(AODepthTexture, TexCoord);
+	float attenutation = ssao.x;
+
+	if (DebugMode == 0)
+		FragColor = vec4(fogColor, 1.0 - attenutation);
+	else if (DebugMode < 3)
+		FragColor = vec4(attenutation, attenutation, attenutation, 1.0);
+	else if (DebugMode == 3)
+		FragColor = vec4(ssao.yyy / 1000.0, 1.0);
+	else
+		FragColor = vec4(ssao.xyz, 1.0);
+}