Pixel-Composer/scripts/surface_draw_functions/surface_draw_functions.gml

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function __channel_pre(surf) {
var f = surface_get_format(surf);
switch(f) {
case surface_r8unorm : shader_set(sh_draw_r8); return;
case surface_r16float : shader_set(sh_draw_r16); return;
case surface_r32float : shader_set(sh_draw_r32); return;
}
}
function __channel_pos(surf) {
var f = surface_get_format(surf);
switch(f) {
case surface_r8unorm :
case surface_r16float :
case surface_r32float :
shader_reset();
return;
}
}