History of shader 1 change

In crates/backdrop/src/gl.rs, lines 93–102 on c30444e35f2e8a7a173e9b7a00a8f5c920f4b86525720df4eac038dfb9e20738. 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.