FIX: FXAA, bloom

shaders/fxaa.frag

@@ -0,0 +1,52 @@
+#version 450
+
+layout(location = 0) in vec2 inUV;
+layout(location = 0) out vec4 outColor;
+
+layout(set = 0, binding = 0) uniform sampler2D uColor;
+
+layout(push_constant) uniform Push
+{
+    float inverse_width;
+    float inverse_height;
+    float edge_threshold;
+    float edge_threshold_min;
+} pc;
+
+float luma(vec3 c)
+{
+    return dot(c, vec3(0.299, 0.587, 0.114));
+}
+
+void main()
+{
+    vec2 texel = vec2(pc.inverse_width, pc.inverse_height);
+
+    vec3 cM = texture(uColor, inUV).rgb;
+    vec3 cN = texture(uColor, inUV + vec2(0.0,  texel.y)).rgb;
+    vec3 cS = texture(uColor, inUV + vec2(0.0, -texel.y)).rgb;
+    vec3 cE = texture(uColor, inUV + vec2( texel.x, 0.0)).rgb;
+    vec3 cW = texture(uColor, inUV + vec2(-texel.x, 0.0)).rgb;
+
+    float lM = luma(cM);
+    float lN = luma(cN);
+    float lS = luma(cS);
+    float lE = luma(cE);
+    float lW = luma(cW);
+
+    float lMin = min(lM, min(min(lN, lS), min(lE, lW)));
+    float lMax = max(lM, max(max(lN, lS), max(lE, lW)));
+    float lRange = lMax - lMin;
+
+    float threshold = max(pc.edge_threshold_min, pc.edge_threshold * lMax);
+    if (lRange < threshold)
+    {
+        outColor = vec4(cM, 1.0);
+        return;
+    }
+
+    // Simple 5-tap cross blur when we detect an edge.
+    vec3 avg = (cM + cN + cS + cE + cW) * 0.2;
+    outColor = vec4(avg, 1.0);
+}
+