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//
// OpenGL visual selection code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2021 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
//
#include <config.h>
#if HAVE_GL
/**
\cond DriverDev
\addtogroup DriverDeveloper
\{
*/
#include <FL/Fl.H>
#include "Fl_Gl_Choice.H"
#include <FL/Fl_Gl_Window.H>
#include "Fl_Gl_Window_Driver.H"
#include <FL/gl_draw.H>
#include <stdlib.h>
#ifndef GL_CURRENT_PROGRAM
// from glew.h in Windows, glext.h in Unix, not used by FLTK's macOS platform
# define GL_CURRENT_PROGRAM 0x8B8D
#endif
typedef void (*glUseProgram_type)(GLint);
static glUseProgram_type glUseProgram_f = NULL;
GLContext *Fl_Gl_Window_Driver::context_list = 0;
int Fl_Gl_Window_Driver::nContext = 0;
static int NContext = 0;
void Fl_Gl_Window_Driver::add_context(GLContext ctx) {
if (!ctx) return;
if (nContext==NContext) {
if (!NContext) NContext = 8;
NContext *= 2;
context_list = (GLContext*)realloc(
context_list, NContext*sizeof(GLContext));
}
context_list[nContext++] = ctx;
}
void Fl_Gl_Window_Driver::del_context(GLContext ctx) {
int i;
for (i=0; i<nContext; i++) {
if (context_list[i]==ctx) {
memmove(context_list+i, context_list+i+1,
(nContext-i-1) * sizeof(GLContext));
context_list[--nContext] = 0;
break;
}
}
if (!nContext) gl_remove_displaylist_fonts();
}
void Fl_Gl_Window_Driver::switch_to_GL1() {
if (!glUseProgram_f) {
glUseProgram_f = (glUseProgram_type)GetProcAddress("glUseProgram");
}
glGetIntegerv(GL_CURRENT_PROGRAM, ¤t_prog);
// Switch from GL3-style to GL1-style drawing;
// good under Windows, X11 and Wayland; not appropriate under macOS.
// suggested by https://stackoverflow.com/questions/22293870/mixing-fixed-function-pipeline-and-programmable-pipeline-in-opengl
if (current_prog) glUseProgram_f(0);
}
void Fl_Gl_Window_Driver::switch_back() {
if (current_prog) glUseProgram_f((GLuint)current_prog);
}
Fl_Gl_Choice *Fl_Gl_Window_Driver::first;
// this assumes one of the two arguments is zero:
// We keep the list system in Win32 to stay compatible and interpret
// the list later...
Fl_Gl_Choice *Fl_Gl_Window_Driver::find_begin(int m, const int *alistp) {
Fl_Gl_Choice *g;
for (g = first; g; g = g->next)
if (g->mode == m && g->alist == alistp)
return g;
return NULL;
}
/**
\}
\endcond
*/
#endif // HAVE_GL
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