History of shader 1 change

In crates/backdrop/src/gl.rs, lines 93–102 on 4dfa4599b3f7e3d1150681fcfca0c2e459262806e6248033cc1ae9cb27de1912. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 93,102:crates/backdrop/src/gl.rs.