source/glcontext.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgbase
   4 Copyright © 2007 Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <vector>
   9 #include <msp/core/except.h>
  10 #include "display.h"
  11 #include "glcontext.h"
  12 #include "window.h"
  13
  14 namespace Msp {
  15 namespace Graphics {
  16
  17 GLOptions::GLOptions():
  18         alpha(false),
  19         stencil(false),
  20         doublebuffer(true),
  21         multisample(0)
  22 { }
  23
  24
  25 GLContext::GLContext(Display &d, const GLOptions &opts):
  26         display(d)
  27 {
  28         std::vector<int> attribs;
  29
  30         attribs.push_back(GLX_RGBA);
  31         attribs.push_back(GLX_DEPTH_SIZE);
  32         attribs.push_back(1);
  33
  34         if(opts.alpha)
  35         {
  36                 attribs.push_back(GLX_ALPHA_SIZE);
  37                 attribs.push_back(1);
  38         }
  39
  40         if(opts.stencil)
  41         {
  42                 attribs.push_back(GLX_STENCIL_SIZE);
  43                 attribs.push_back(1);
  44         }
  45
  46         if(opts.doublebuffer)
  47                 attribs.push_back(GLX_DOUBLEBUFFER);
  48
  49         if(opts.multisample>0)
  50         {
  51                 attribs.push_back(GLX_SAMPLE_BUFFERS_ARB);
  52                 attribs.push_back(opts.multisample);
  53         }
  54
  55         attribs.push_back(0);
  56
  57         ::Display *dpy=display.get_display();
  58         XVisualInfo *vi=glXChooseVisual(dpy, DefaultScreen(dpy), &attribs.front());
  59         if(!vi)
  60                 throw Exception("Couldn't find a GLX visual");
  61         context=glXCreateContext(dpy, vi, 0, true);
  62
  63         XSetWindowAttributes attr;
  64         attr.colormap=XCreateColormap(dpy, DefaultRootWindow(dpy), vi->visual, AllocNone);
  65
  66         window=XCreateWindow(dpy, DefaultRootWindow(dpy), 0, 0, 1024, 768, 0, vi->depth, InputOutput, vi->visual, CWColormap, &attr);
  67
  68         glXMakeCurrent(dpy, window, context);
  69 }
  70
  71 void GLContext::attach(Window &wnd)
  72 {
  73         XReparentWindow(display.get_display(), window, wnd.get_handle(), 0, 0);
  74         XMapWindow(display.get_display(), window);
  75
  76         wnd.signal_resize.connect(sigc::mem_fun(this, &GLContext::window_resized));
  77         window_resized(wnd.get_width(), wnd.get_height());
  78 }
  79
  80 void GLContext::swap_buffers()
  81 {
  82         glXSwapBuffers(display.get_display(), window);
  83 }
  84
  85 void GLContext::window_resized(unsigned w, unsigned h)
  86 {
  87         XMoveResizeWindow(display.get_display(), window, 0, 0, w, h);
  88         glViewport(0, 0, w, h);
  89 }
  90
  91 } // namespace Graphics
  92 } // namespace Msp