init

assets/shaders/ssao_apply.frag

@@ -0,0 +1,29 @@
+#version 450 core
+#include "common.glsl"
+// Depth-aware upsample of the AO buffer; output is multiplied into the HDR
+// target by the blend unit (DST_COLOR, ZERO).
+
+in vec2 vUV;
+layout(binding = 0) uniform sampler2D uAo;
+layout(binding = 1) uniform sampler2D uDepth;
+uniform vec2 uAoTexel;
+layout(location = 0) out vec4 fragColor;
+
+void main() {
+    float raw = texture(uDepth, vUV).r;
+    if (raw >= 1.0) {
+        fragColor = vec4(1.0);
+        return;
+    }
+    float d0 = linearDepth(raw);
+    float sum = 0.0, wsum = 0.0;
+    for (int y = -1; y <= 1; ++y)
+        for (int x = -1; x <= 1; ++x) {
+            vec2 uv = vUV + vec2(x, y) * uAoTexel;
+            float d = linearDepth(texture(uDepth, uv).r);
+            float w = exp(-abs(d - d0) / (0.03 * d0 + 0.05));
+            sum += texture(uAo, uv).r * w;
+            wsum += w;
+        }
+    fragColor = vec4(vec3(sum / max(wsum, 1e-4)), 1.0);
+}