source/gbase/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 #ifdef WIN32
  10 #include <windows.h>
  11 #endif
  12 #include <GL/gl.h>
  13 #include <msp/core/application.h>
  14 #include <msp/core/except.h>
  15 #include "display.h"
  16 #include "glcontext.h"
  17 #include "window.h"
  18
  19 namespace Msp {
  20 namespace Graphics {
  21
  22 GLOptions::GLOptions():
  23         alpha(false),
  24         stencil(false),
  25         doublebuffer(true),
  26         multisample(0)
  27 { }
  28
  29
  30 GLContext::GLContext(Window &wnd, const GLOptions &opts):
  31         display(wnd.get_display()),
  32         window(wnd)
  33 {
  34 #ifdef WIN32
  35         HDC dc=GetDC(window.get_handle());
  36
  37         PIXELFORMATDESCRIPTOR pfd;
  38         memset(&pfd, 0, sizeof(pfd));
  39
  40         pfd.nSize=sizeof(pfd);
  41         pfd.nVersion=1;
  42         pfd.dwFlags=PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL;
  43         if(opts.doublebuffer)
  44                 pfd.dwFlags|=PFD_DOUBLEBUFFER;
  45         pfd.iPixelType=PFD_TYPE_RGBA;
  46         if(opts.alpha)
  47                 pfd.cAlphaBits=1;
  48         pfd.cDepthBits=1;
  49         if(opts.stencil)
  50                 pfd.cStencilBits=1;
  51
  52         int pf_index=ChoosePixelFormat(dc, &pfd);
  53         if(!pf_index)
  54                 throw Exception("Couldn't find a suitable pixel format");
  55         SetPixelFormat(dc, pf_index, &pfd);
  56
  57         context=wglCreateContext(dc);
  58         wglMakeCurrent(dc, context);
  59
  60         ReleaseDC(window.get_handle(), dc);
  61 #else
  62         std::vector<int> attribs;
  63
  64         attribs.push_back(GLX_RGBA);
  65         attribs.push_back(GLX_DEPTH_SIZE);
  66         attribs.push_back(1);
  67
  68         if(opts.alpha)
  69         {
  70                 attribs.push_back(GLX_ALPHA_SIZE);
  71                 attribs.push_back(1);
  72         }
  73
  74         if(opts.stencil)
  75         {
  76                 attribs.push_back(GLX_STENCIL_SIZE);
  77                 attribs.push_back(1);
  78         }
  79
  80         if(opts.doublebuffer)
  81                 attribs.push_back(GLX_DOUBLEBUFFER);
  82
  83         if(opts.multisample>0)
  84         {
  85                 attribs.push_back(GLX_SAMPLE_BUFFERS_ARB);
  86                 attribs.push_back(opts.multisample);
  87         }
  88
  89         attribs.push_back(0);
  90
  91         ::Display *dpy=display.get_display();
  92
  93         XVisualInfo *vi=glXChooseVisual(dpy, DefaultScreen(dpy), &attribs.front());
  94         if(!vi)
  95                 throw Exception("Couldn't find a suitable GLX visual");
  96         context=glXCreateContext(dpy, vi, 0, true);
  97
  98         XSetWindowAttributes attr;
  99         attr.colormap=XCreateColormap(dpy, DefaultRootWindow(dpy), vi->visual, AllocNone);
 100
 101         subwnd=XCreateWindow(dpy, window.get_handle(), 0, 0, window.get_width(), window.get_height(), 0, vi->depth, InputOutput, vi->visual, CWColormap, &attr);
 102         XMapWindow(display.get_display(), subwnd);
 103
 104         XFree(vi);
 105
 106         glXMakeCurrent(dpy, subwnd, context);
 107 #endif
 108
 109         window.signal_resize.connect(sigc::mem_fun(this, &GLContext::window_resized));
 110 }
 111
 112 GLContext::~GLContext()
 113 {
 114 #ifdef WIN32
 115         wglMakeCurrent(0, 0);
 116         wglDeleteContext(context);
 117 #else
 118         ::Display *dpy=display.get_display();
 119
 120         glXMakeCurrent(dpy, 0, 0);
 121         glXDestroyContext(dpy, context);
 122         XDestroyWindow(dpy, subwnd);
 123 #endif
 124 }
 125
 126 void GLContext::swap_buffers()
 127 {
 128 #ifdef WIN32
 129         HDC dc=GetDC(window.get_handle());
 130         SwapBuffers(dc);
 131         ReleaseDC(window.get_handle(), dc);
 132 #else
 133         glXSwapBuffers(display.get_display(), subwnd);
 134 #endif
 135 }
 136
 137 void GLContext::window_resized(unsigned w, unsigned h)
 138 {
 139 #ifndef WIN32
 140         XMoveResizeWindow(display.get_display(), subwnd, 0, 0, w, h);
 141 #endif
 142         glViewport(0, 0, w, h);
 143 }
 144
 145 } // namespace Graphics
 146 } // namespace Msp