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