Simply Shaded (Iris)
=====================================

What this is
------------
A deliberately minimal Iris shaderpack. It's not trying to add any
visual effects - it's trying to add as little overhead as possible
on top of vanilla rendering while still being a "real" shaderpack
you can select in Iris.

Why it's fast
-------------
1. No shadow pass at all. There's no shadow.vsh/shadow.fsh in this
   pack, so Iris skips the shadow map render entirely. The shadow
   pass is usually the single most expensive part of a shaderpack
   (it redraws the whole world from the sun's point of view), so
   removing it is the biggest win here.

2. No composite/deferred/final passes. There are no composite*.fsh
   or final.fsh files, so there's no extra full-screen post-processing
   pass running every frame.

3. The only "real" shaders are gbuffers_basic, gbuffers_textured,
   gbuffers_textured_lit, gbuffers_terrain, and gbuffers_entities.
   Every other rendering stage (water, blocks, the held item in
   your hand, weather, sky, clouds, armor glint, spider eyes, beacon
   beams, etc.) automatically falls back to one of these through
   Iris's built-in fallback chain - so you get full, correct vanilla-
   style rendering without needing a shader file for every stage.

4. Each shader does the minimum possible math: sample the block
   texture, multiply by vertex color, multiply by the lightmap.
   That's it. Optional terrain fog adds one extra mix() per pixel
   and can be turned off entirely.

Installing
----------
1. Unzip (or just drop the zip) into your .minecraft/shaderpacks folder.
2. In Minecraft, open Video Settings > Shader Packs (requires Iris
   installed) and select "Simply Shaded".
And the shader should work!