fix that some drivers fail to compile a shader when a code line is NULL with length zero

adds first basic rectangle shader

make draw function dynamic

resolve east-west conflict

implement interval for behaviors - fixes #383

compute frame time before syncing to avoid div-by-zero in first frame

fix micro fail

consistent naming of structs and their typedefs

(0) -100 -30 -10 -8 +8 +10 tip

mercurial