replace ugly backdrop texture default tip

first idea of what the main scene could look like

add asc_create_flags() utility function

simplify build and copy assets to build dir

simplify how pre-defined shader IDs work

prevent attempts to load a shader again that already failed before

fix broken nullptr handling in asc_shader_use() - fixes #696

clean up the messy shader code specification

vastly deduplicate shader creation code

slightly improve error handling

(0) -100 -10 tip

mercurial