diff --git a/src/rendering/hwrenderer/postprocessing/hw_postprocess.cpp b/src/rendering/hwrenderer/postprocessing/hw_postprocess.cpp
index c692b9809..40102866e 100644
--- a/src/rendering/hwrenderer/postprocessing/hw_postprocess.cpp
+++ b/src/rendering/hwrenderer/postprocessing/hw_postprocess.cpp
@@ -697,6 +697,10 @@ void PPAmbientOcclusion::Render(PPRenderState *renderstate, float m5, int sceneW
 	ssaoUniforms.Scale = sceneScale;
 	ssaoUniforms.Offset = sceneOffset;
 
+	DepthBlurUniforms blurUniforms;
+	blurUniforms.BlurSharpness = blurSharpness;
+	blurUniforms.PowExponent = gl_ssao_exponent;
+
 	AmbientCombineUniforms combineUniforms;
 	combineUniforms.SampleCount = gl_multisample;
 	combineUniforms.Scale = screen->SceneScale();
@@ -735,11 +739,6 @@ void PPAmbientOcclusion::Render(PPRenderState *renderstate, float m5, int sceneW
 	// Blur SSAO texture
 	if (gl_ssao_debug < 2)
 	{
-		DepthBlurUniforms blurUniforms;
-		blurUniforms.BlurSharpness = blurSharpness;
-		blurUniforms.PowExponent = gl_ssao_exponent;
-		blurUniforms.InvFullResolution = { 1.0f / AmbientWidth, 0.0f };
-
 		renderstate->Clear();
 		renderstate->Shader = &BlurHorizontal;
 		renderstate->Uniforms.Set(blurUniforms);
@@ -749,8 +748,6 @@ void PPAmbientOcclusion::Render(PPRenderState *renderstate, float m5, int sceneW
 		renderstate->SetNoBlend();
 		renderstate->Draw();
 
-		blurUniforms.InvFullResolution = { 0.0f, 1.0f / AmbientHeight };
-
 		renderstate->Clear();
 		renderstate->Shader = &BlurVertical;
 		renderstate->Uniforms.Set(blurUniforms);
diff --git a/src/rendering/hwrenderer/postprocessing/hw_postprocess.h b/src/rendering/hwrenderer/postprocessing/hw_postprocess.h
index fca4ec77b..7a70ac484 100644
--- a/src/rendering/hwrenderer/postprocessing/hw_postprocess.h
+++ b/src/rendering/hwrenderer/postprocessing/hw_postprocess.h
@@ -634,7 +634,7 @@ struct DepthBlurUniforms
 {
 	float BlurSharpness;
 	float PowExponent;
-	FVector2 InvFullResolution;
+	float Padding0, Padding1;
 
 	static std::vector<UniformFieldDesc> Desc()
 	{
@@ -642,7 +642,8 @@ struct DepthBlurUniforms
 		{
 			{ "BlurSharpness", UniformType::Float, offsetof(DepthBlurUniforms, BlurSharpness) },
 			{ "PowExponent", UniformType::Float, offsetof(DepthBlurUniforms, PowExponent) },
-			{ "InvFullResolution", UniformType::Vec2, offsetof(DepthBlurUniforms, InvFullResolution) }
+			{ "Padding0", UniformType::Float, offsetof(DepthBlurUniforms, Padding0) },
+			{ "Padding1", UniformType::Float, offsetof(DepthBlurUniforms, Padding1) }
 		};
 	}
 };
diff --git a/wadsrc/static/shaders/glsl/depthblur.fp b/wadsrc/static/shaders/glsl/depthblur.fp
index 299b63694..b337025bc 100644
--- a/wadsrc/static/shaders/glsl/depthblur.fp
+++ b/wadsrc/static/shaders/glsl/depthblur.fp
@@ -6,42 +6,43 @@ layout(binding=0) uniform sampler2D AODepthTexture;
 
 #define KERNEL_RADIUS 3.0
 
-void main()
+void AddSample(vec2 blurSample, float r, float centerDepth, inout float totalAO, inout float totalW)
 {
 	const float blurSigma = KERNEL_RADIUS * 0.5;
 	const float blurFalloff = 1.0 / (2.0 * blurSigma * blurSigma);
 
-	vec2 centerSample = texture(AODepthTexture, TexCoord).xy;
+	float ao = blurSample.x;
+	float z = blurSample.y;
 
+	float deltaZ = (z - centerDepth) * BlurSharpness;
+	float w = exp2(-r * r * blurFalloff - deltaZ * deltaZ);
+
+	totalAO += w * ao;
+	totalW += w;
+}
+
+void main()
+{
+	vec2 centerSample = textureOffset(AODepthTexture, TexCoord, ivec2( 0, 0)).xy;
 	float centerDepth = centerSample.y;
 	float totalAO = centerSample.x;
 	float totalW = 1.0;
 
-	for (float r = 1.0; r <= KERNEL_RADIUS; r += 1.0)
-	{
-		vec4 blurSample = texture(AODepthTexture, TexCoord - InvFullResolution * r);
-		float ao = blurSample.x;
-		float z = blurSample.y;
-
-		float deltaZ = (z - centerDepth) * BlurSharpness;
-		float w = exp2(-r * r * blurFalloff - deltaZ * deltaZ);
-
-		totalAO += w * ao;
-		totalW += w;
-	}
-
-	for (float r = 1.0; r <= KERNEL_RADIUS; r += 1.0)
-	{
-		vec4 blurSample = texture(AODepthTexture, InvFullResolution * r + TexCoord);
-		float ao = blurSample.x;
-		float z = blurSample.y;
-
-		float deltaZ = (z - centerDepth) * BlurSharpness;
-		float w = exp2(-r * r * blurFalloff - deltaZ * deltaZ);
-
-		totalAO += w * ao;
-		totalW += w;
-	}
+#if defined(BLUR_HORIZONTAL)
+	AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(-3, 0)).xy, 3.0, centerDepth, totalAO, totalW);
+	AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(-2, 0)).xy, 2.0, centerDepth, totalAO, totalW);
+	AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(-1, 0)).xy, 1.0, centerDepth, totalAO, totalW);
+	AddSample(textureOffset(AODepthTexture, TexCoord, ivec2( 1, 0)).xy, 1.0, centerDepth, totalAO, totalW);
+	AddSample(textureOffset(AODepthTexture, TexCoord, ivec2( 2, 0)).xy, 2.0, centerDepth, totalAO, totalW);
+	AddSample(textureOffset(AODepthTexture, TexCoord, ivec2( 3, 0)).xy, 3.0, centerDepth, totalAO, totalW);
+#else
+	AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(0, -3)).xy, 3.0, centerDepth, totalAO, totalW);
+	AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(0, -2)).xy, 2.0, centerDepth, totalAO, totalW);
+	AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(0, -1)).xy, 1.0, centerDepth, totalAO, totalW);
+	AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(0,  1)).xy, 1.0, centerDepth, totalAO, totalW);
+	AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(0,  2)).xy, 2.0, centerDepth, totalAO, totalW);
+	AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(0,  3)).xy, 3.0, centerDepth, totalAO, totalW);
+#endif
 
 	float fragAO = totalAO / totalW;