i am a shader developer, and i used the GL4ES successfully created a simple shader that only change the world colour, it works fine in the 1.16.4 forge version, but when i switched to 1.12.2 version ...
at net.optifine.util.TextureUtils$1.func_110549_a(TextureUtils.java:362) at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110542_a ...