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We need to flush all pending mouse move events past a mouse warp to avoid

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a race condition ending in warping twice and having huge increments for the
second warp.
I am not aware of such a flush function in glut. So we emulate that by
ignoring mouse move events between a warp mouse and the next frame.
That should make glut behavour aequivalent to sdl behavour.
This commit is contained in:
frohlich 2006-03-10 07:13:59 +00:00
parent c486dc0589
commit dc958d6e8e
1 changed files with 12 additions and 0 deletions
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12
src/Main/fg_os.cxx
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@ -28,6 +28,13 @@ static fgKeyHandler KeyHandler = 0;
static fgMouseClickHandler MouseClickHandler = 0;
static fgMouseMotionHandler MouseMotionHandler = 0;
// We need to flush all pending mouse move events past a mouse warp to avoid
// a race condition ending in warping twice and having huge increments for the
// second warp.
// I am not aware of such a flush function in glut. So we emulate that by
// ignoring mouse move events between a warp mouse and the next frame.
static bool mouseWarped = false;
void fgRegisterIdleHandler(fgIdleHandler func)
{
IdleHandler = func;
@ -75,6 +82,8 @@ static void callKeyHandler(int k, int mods, int x, int y)
static void GLUTmotion (int x, int y)
{
if (mouseWarped)
return;
if(MouseMotionHandler) (*MouseMotionHandler)(x, y);
}
@ -111,12 +120,14 @@ static void GLUTkey(unsigned char k, int x, int y)
static void GLUTidle()
{
if(IdleHandler) (*IdleHandler)();
mouseWarped = false;
}
static void GLUTdraw()
{
if(DrawHandler) (*DrawHandler)();
glutSwapBuffers();
mouseWarped = false;
}
static void GLUTreshape(int w, int h)
@ -169,6 +180,7 @@ void fgSetMouseCursor(int cursor)
void fgWarpMouse(int x, int y)
{
mouseWarped = true;
glutWarpPointer(x, y);
}