init

assets/shaders/ssao_blur.frag

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+#version 450 core
+#include "common.glsl"
+// Separable depth-aware blur of the half-res AO buffer.
+
+in vec2 vUV;
+layout(binding = 0) uniform sampler2D uAo;
+layout(binding = 1) uniform sampler2D uDepth;
+uniform vec2 uDir;  // texel step along the blur axis
+layout(location = 0) out vec4 fragColor;
+
+void main() {
+    float d0 = linearDepth(texture(uDepth, vUV).r);
+    float sum = 0.0, wsum = 0.0;
+    for (int i = -4; i <= 4; ++i) {
+        vec2 uv = vUV + uDir * float(i);
+        float d = linearDepth(texture(uDepth, uv).r);
+        float w = exp(-float(i * i) / 12.0) * exp(-abs(d - d0) / (0.03 * d0 + 0.05));
+        sum += texture(uAo, uv).r * w;
+        wsum += w;
+    }
+    fragColor = vec4(sum / max(wsum, 1e-4));
+}