RI_MOUSE_BUTTON_1_UP

Undocumented in source but is binding to Windows. You might be able to learn more by searching the web for its name.

extern (Windows) @system nothrow @nogc

static if(_WIN32_WINNT >= 0x501)

enum RI_MOUSE_BUTTON_1_UP = RI_MOUSE_LEFT_BUTTON_UP;

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