fix includes in glcontext.c

implement edge-triggered key press/release

add dynamic reload of all shaders

refactor shader management - resolves #684

add option to enable ASan

remove pre-defined dummy textures by introducing conditional compilation for shaders

fix incorrect flip of viewport y-axis

remove the need for a second pair of texture coordinates

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

mercurial