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Fixed the gl_overlay demo (and gl overlays in general) when they are

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faked with no hardware and the window is resized.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.0@984 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Bill Spitzak 2000-01-12 06:06:24 +00:00
parent 0bdb9aba79
commit b45efe96dc
1 changed files with 9 additions and 3 deletions
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12
src/Fl_Gl_Window.cxx
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@ -1,5 +1,5 @@
//
// "$Id: Fl_Gl_Window.cxx,v 1.12.2.5 1999/12/19 05:32:34 bill Exp $"
// "$Id: Fl_Gl_Window.cxx,v 1.12.2.6 2000/01/12 06:06:24 bill Exp $"
//
// OpenGL window code for the Fast Light Tool Kit (FLTK).
//
@ -199,8 +199,10 @@ void Fl_Gl_Window::flush() {
if (overlay == this) { // Use CopyPixels to act like SWAP_TYPE == COPY
uchar save_valid = valid_;
// don't draw if only the overlay is damaged:
if (damage1_ || damage() != FL_DAMAGE_OVERLAY || !valid()) draw();
// we use a seperate context for the copy because rasterpos must be 0
// and depth test needs to be off:
static GLXContext ortho_context;
@ -212,10 +214,14 @@ void Fl_Gl_Window::flush() {
ortho_context = glXCreateContext(fl_display,g->vis,fl_first_context,1);
#endif
fl_set_gl_context(this, ortho_context);
if (init) {
if (init || !save_valid) {
glDisable(GL_DEPTH_TEST);
glReadBuffer(GL_BACK);
glDrawBuffer(GL_FRONT);
glLoadIdentity();
glViewport(0, 0, w(), h());
glOrtho(0, w(), 0, h(), -1, 1);
glRasterPos2i(0,0);
}
glCopyPixels(0,0,w(),h(),GL_COLOR);
make_current(); // set current context back to draw overlay
@ -316,5 +322,5 @@ void Fl_Gl_Window::draw_overlay() {}
#endif
//
// End of "$Id: Fl_Gl_Window.cxx,v 1.12.2.5 1999/12/19 05:32:34 bill Exp $".
// End of "$Id: Fl_Gl_Window.cxx,v 1.12.2.6 2000/01/12 06:06:24 bill Exp $".
//