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Glimmer

Glimmer is a Minecraft shaderpack designed to be simple and performant without looking like it.

Features

'Potato', 'Toaster', 'Integrated Graphics' and 'Dedicated Graphics' presets, designed to run on anything from your fridge to a NASA supercomputer.
Colored block lighting!
Distant Horizons support!
'Infinite Ocean', adding water stretching out of render distance.
Complete LabPBR 1.3 compliance.
Shadows, using either the shadow map or approximated from the lightmap.
Screen space reflections and refractions.
Procedural 2D clouds.
Temporal filtering to reduce noise at low sample counts.
Bloom

OpenGL 4.3+ - macOS is not supported, nor is the Raspberry Pi. Most modern GPUs (integrated or dedicated) should work fine.
Iris 1.6+, OptiFine is not supported.

Andrew Hilmer, for his Shadertoy implementation of Sébastien Hillaire's 'A Scalable and Production Ready Sky and Atmosphere Rendering Technique'
Belmu - Reference code for SSR
Emin - Shadow bias calculation from Complementary
NinjaMike - Directional lightmapping method
sixthsurge - A decent amount of code reference from Photon
Null - Help porting in the atmospheric scattering code
As always, the members of the ShaderLABS Discord server who have helped me get this far learning how to do all this
Many other people, there are links scattered throughout the code

If you have an issue with Glimmer or just want to chat, you can join my Discord server or find me in #jbritains-shaderpacks in the shaderLABS Discord server.