working 6-stage fragments

shaders/frag3.glsl

@@ -0,0 +1,19 @@
+#version 460
+
+uniform float iTime;
+uniform vec2 iResolution;
+
+uniform sampler2D frame3;
+uniform sampler2D frame5;
+
+in vec2 vUV;
+layout(location = 5) out vec3 fragColor;
+
+// FX A
+// ---------
+// IN: 3 / 5
+// OUT: 5
+
+void main() {
+    fragColor = texture(frame3, vUV).xyz;
+}