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A shader effect

Status: Implemented (API 1.13). Post-processing passes from mod GLSL ship. The full walkthrough, including a keybind that toggles a pass, is Post Processing and Camera; this page is a short pointer.

A greyscale effect on a key

  1. Write the pass in assets/<mod>/shaders/post/grey.glsl:
vec4 cl_post(vec2 uv) {
    vec4 c = cl_scene(uv);
    float g = dot(c.rgb, vec3(0.299, 0.587, 0.114));
    return vec4(vec3(g), 1.0);
}
  1. Register it once at client setup, switched off, and toggle it with a keybind:
local grey, key
cl.on("lifecycle.client_setup", function()
  grey = cl.render.post_pass{ id = "grey", shader = "my_mod:shaders/post/grey.glsl" }
  grey:set_enabled(false)
  key = cl.keybind.register{ id = "my_mod:grey", default_key = "key.keyboard.g", label = "Greyscale" }
end)

local on = false
cl.on("tick.client_post", function()
  if not key then return end
  while key:consume_click() do
    on = not on
    grey:set_enabled(on)
  end
end)

While the pass is off it costs nothing; the frame is exactly vanilla.

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