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