added texture. looks like copying the one from the compute output isn't going to totally work out of the box

resources/shaders/simple_texture.fragment

@@ -0,0 +1,7 @@
+#version 450
+layout(location = 0) in vec2 tex_coords;
+layout(location = 0) out vec4 f_color;
+layout(set = 0, binding = 0) uniform sampler2D tex;
+void main() {
+    f_color = texture(tex, tex_coords);
+}