source/glwindow.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 "glwindow.h"
  11
  12 using namespace std;
  13
  14 namespace Msp {
  15
  16 GLDisplayOptions::GLDisplayOptions():
  17         alpha(false),
  18         stencil(false),
  19         doublebuffer(true),
  20         multisample(0)
  21 { }
  22
  23
  24 GLWindow::GLWindow(unsigned w, unsigned h)
  25 {
  26         options.width=w;
  27         options.height=h;
  28         init();
  29 }
  30
  31 GLWindow::GLWindow(const DisplayOptions &dopt, const GLDisplayOptions &gl_dopt)
  32 {
  33         options=dopt;
  34         gl_options=gl_dopt;
  35         init();
  36 }
  37
  38 GLWindow::~GLWindow()
  39 {
  40         glXMakeContextCurrent(display, 0, 0, 0);
  41         glXDestroyWindow(display, glx_wnd);
  42         glXDestroyContext(display, context);
  43 }
  44
  45 void GLWindow::swap_buffers()
  46 {
  47         glXSwapBuffers(display, glx_wnd);
  48 }
  49
  50 void GLWindow::init()
  51 {
  52         prepare();
  53
  54         vector<int> attribs;
  55
  56         attribs.push_back(GLX_RENDER_TYPE);
  57         attribs.push_back(GLX_RGBA_BIT);
  58
  59         attribs.push_back(GLX_DRAWABLE_TYPE);
  60         attribs.push_back(GLX_WINDOW_BIT);
  61
  62         attribs.push_back(GLX_DEPTH_SIZE);
  63         attribs.push_back(1);
  64
  65         if(gl_options.alpha)
  66         {
  67                 attribs.push_back(GLX_ALPHA_SIZE);
  68                 attribs.push_back(1);
  69         }
  70
  71         if(gl_options.stencil)
  72         {
  73                 attribs.push_back(GLX_STENCIL_SIZE);
  74                 attribs.push_back(1);
  75         }
  76
  77         if(gl_options.doublebuffer)
  78         {
  79                 attribs.push_back(GLX_DOUBLEBUFFER);
  80                 attribs.push_back(true);
  81         }
  82
  83         if(gl_options.multisample>0)
  84         {
  85                 attribs.push_back(GLX_SAMPLE_BUFFERS_ARB);
  86                 attribs.push_back(gl_options.multisample);
  87         }
  88
  89         attribs.push_back(None);
  90
  91         int count;
  92         GLXFBConfig *config=glXChooseFBConfig(display, DefaultScreen(display), &attribs.front(), &count);
  93         if(!config)
  94                 throw Exception("Couldn't get a GLX framebuffer configuration");
  95
  96         context=glXCreateNewContext(display, config[0], GLX_RGBA_TYPE, 0, true);
  97         if(!context)
  98                 throw Exception("Couldn't create a GLX context");
  99
 100         XVisualInfo *vi=glXGetVisualFromFBConfig(display, config[0]);
 101         Handle root=RootWindow(display, vi->screen);
 102
 103         Colormap cmap=XCreateColormap(display, root, vi->visual, AllocNone);
 104         XSetWindowAttributes attr;
 105         attr.colormap=cmap;
 106
 107         Handle wnd=XCreateWindow(display, root, 0, 0, options.width, options.height, 0, vi->depth, InputOutput, vi->visual, CWColormap, &attr);
 108         set_window(wnd);
 109
 110         glx_wnd=glXCreateWindow(display, config[0], wnd, 0);
 111
 112         glXMakeContextCurrent(display, glx_wnd, glx_wnd, context);
 113
 114         XFree(config);
 115 }
 116
 117 void GLWindow::on_event(const XEvent &event)
 118 {
 119         if(event.type==ConfigureNotify)
 120                 glViewport(0, 0, options.width, options.height);
 121 }
 122
 123 } // namespace Msp