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/error.h>
  10 #include "glwindow.h"
  11
  12 using namespace std;
  13
  14 namespace Msp {
  15
  16 GLDisplayOptions::GLDisplayOptions():
  17         alpha(false),
  18         doublebuffer(true),
  19         multisample(0)
  20 { }
  21
  22
  23 GLWindow::GLWindow(unsigned w, unsigned h)
  24 {
  25         options.width=w;
  26         options.height=h;
  27         init();
  28 }
  29
  30 GLWindow::GLWindow(const DisplayOptions &dopt, const GLDisplayOptions &gl_dopt)
  31 {
  32         options=dopt;
  33         gl_options=gl_dopt;
  34         init();
  35 }
  36
  37 GLWindow::~GLWindow()
  38 {
  39         glXMakeCurrent(display, 0, 0);
  40         glXDestroyContext(display, context);
  41 }
  42
  43 void GLWindow::swap_buffers()
  44 {
  45         glXSwapBuffers(display, window);
  46 }
  47
  48 void GLWindow::init()
  49 {
  50         prepare();
  51
  52         vector<int> attribs;
  53         attribs.push_back(GLX_RGBA);
  54         attribs.push_back(GLX_BUFFER_SIZE);
  55         attribs.push_back(24);
  56         if(gl_options.alpha)
  57         {
  58                 attribs.push_back(GLX_ALPHA_SIZE);
  59                 attribs.push_back(1);
  60         }
  61         if(gl_options.doublebuffer)
  62                 attribs.push_back(GLX_DOUBLEBUFFER);
  63         if(gl_options.multisample>0)
  64         {
  65                 attribs.push_back(GLX_SAMPLE_BUFFERS_ARB);
  66                 attribs.push_back(gl_options.multisample);
  67         }
  68         attribs.push_back(0);
  69
  70         XVisualInfo *visual=glXChooseVisual(display, DefaultScreen(display), &attribs.front());
  71         if(!visual)
  72                 throw Exception("Couldn't get a matching GLX visual");
  73
  74         context=glXCreateContext(display, visual, 0, true);
  75         if(!context)
  76                 throw Exception("Couldn't create a GLX context");
  77
  78         create();
  79
  80         glXMakeCurrent(display, window, context);
  81 }
  82
  83 void GLWindow::on_resize()
  84 {
  85         glViewport(0, 0, options.width, options.height);
  86 }
  87
  88 } // namespace Msp