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//
// OpenGL context routines for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2020 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
// You MUST use gl_visual() to select the default visual before doing
// show() of any windows. Mesa will crash if you try to use a visual
// not returned by glxChooseVisual.
// This does not work with Fl_Double_Window's! It will try to draw
// into the front buffer. Depending on the system this will either
// crash or do nothing (when pixmaps are being used as back buffer
// and GL is being done by hardware), work correctly (when GL is done
// with software, such as Mesa), or draw into the front buffer and
// be erased when the buffers are swapped (when double buffer hardware
// is being used)
#include <config.h>
#if HAVE_GL
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/fl_draw.H>
#include <FL/gl.h>
class Fl_Gl_Choice;
#include <FL/Fl_Gl_Window.H>
#include "Fl_Gl_Window_Driver.H"
GLContext Fl_Gl_Window_Driver::gl_start_context;
static int clip_state_number=-1;
static int pw, ph;
float gl_start_scale = 1;
static Fl_Gl_Choice* gl_choice = NULL;
/** Creates an OpenGL context */
void gl_start() {
gl_start_scale = Fl_Display_Device::display_device()->driver()->scale();
if (!Fl_Gl_Window_Driver::gl_start_context) {
if (!gl_choice) Fl::gl_visual(0);
Fl_Gl_Window_Driver::gl_start_context = Fl_Gl_Window_Driver::global()->create_gl_context(Fl_Window::current(), gl_choice);
}
Fl_Gl_Window_Driver::global()->set_gl_context(Fl_Window::current(), Fl_Gl_Window_Driver::gl_start_context);
Fl_Gl_Window_Driver::global()->gl_start();
if (pw != int(Fl_Window::current()->w() * gl_start_scale) || ph != int(Fl_Window::current()->h() * gl_start_scale)) {
pw = int(Fl_Window::current()->w() * gl_start_scale);
ph = int(Fl_Window::current()->h() * gl_start_scale);
glLoadIdentity();
glViewport(0, 0, pw, ph);
glOrtho(0, Fl_Window::current()->w(), 0, Fl_Window::current()->h(), -1, 1);
glDrawBuffer(GL_FRONT);
}
if (clip_state_number != fl_graphics_driver->fl_clip_state_number) {
clip_state_number = fl_graphics_driver->fl_clip_state_number;
int x = 0, y = 0, w = 0, h = 0;
if (fl_clip_box(0, 0, Fl_Window::current()->w(), Fl_Window::current()->h(),
x, y, w, h)) {
fl_clip_region(Fl_Graphics_Driver::default_driver().XRectangleRegion(x,y,w,h));
glScissor(x*gl_start_scale, (Fl_Window::current()->h()-(y+h))*gl_start_scale, w*gl_start_scale, h*gl_start_scale);
glEnable(GL_SCISSOR_TEST);
} else {
glDisable(GL_SCISSOR_TEST);
}
}
Fl_Display_Device::display_device()->driver()->scale(1);
}
/** Releases an OpenGL context */
void gl_finish() {
glFlush();
Fl_Gl_Window_Driver::global()->waitGL();
Fl_Display_Device::display_device()->driver()->scale(gl_start_scale);
gl_start_scale = 1;
}
/**
\cond DriverDev
\addtogroup DriverDeveloper
\{
*/
void Fl_Gl_Window_Driver::gl_visual(Fl_Gl_Choice *c) {
gl_choice = c;
}
int Fl::gl_visual(int mode, int *alist) {
Fl_Gl_Choice *c = Fl_Gl_Window_Driver::global()->find(mode,alist);
if (!c) return 0;
Fl_Gl_Window_Driver::global()->gl_visual(c);
return 1;
}
/**
\}
\endcond
*/
#endif // HAVE_GL
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