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 #include <iostream>
  20 using namespace std;
  21
  22 namespace Msp {
  23 namespace Graphics {
  24
  25 GLOptions::GLOptions():
  26         alpha(false),
  27         stencil(false),
  28         doublebuffer(true),
  29         multisample(0)
  30 { }
  31
  32
  33 GLContext::GLContext(Window &wnd, const GLOptions &opts):
  34         display(wnd.get_display()),
  35         window(wnd)
  36 {
  37 #ifdef WIN32
  38         HDC dc=GetDC(window.get_handle());
  39
  40         PIXELFORMATDESCRIPTOR pfd;
  41         memset(&pfd, 0, sizeof(pfd));
  42
  43         pfd.nSize=sizeof(pfd);
  44         pfd.nVersion=1;
  45         pfd.dwFlags=PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL;
  46         if(opts.doublebuffer)
  47                 pfd.dwFlags|=PFD_DOUBLEBUFFER;
  48         pfd.iPixelType=PFD_TYPE_RGBA;
  49         if(opts.alpha)
  50                 pfd.cAlphaBits=1;
  51         pfd.cDepthBits=1;
  52         if(opts.stencil)
  53                 pfd.cStencilBits=1;
  54
  55         int pf_index=ChoosePixelFormat(dc, &pfd);
  56         if(!pf_index)
  57                 throw Exception("Couldn't find a suitable pixel format");
  58         SetPixelFormat(dc, pf_index, &pfd);
  59
  60         context=wglCreateContext(dc);
  61         wglMakeCurrent(dc, context);
  62
  63         ReleaseDC(window.get_handle(), dc);
  64 #else
  65         std::vector<int> attribs;
  66
  67         attribs.push_back(GLX_RGBA);
  68         attribs.push_back(GLX_DEPTH_SIZE);
  69         attribs.push_back(1);
  70
  71         if(opts.alpha)
  72         {
  73                 attribs.push_back(GLX_ALPHA_SIZE);
  74                 attribs.push_back(1);
  75         }
  76
  77         if(opts.stencil)
  78         {
  79                 attribs.push_back(GLX_STENCIL_SIZE);
  80                 attribs.push_back(1);
  81         }
  82
  83         if(opts.doublebuffer)
  84                 attribs.push_back(GLX_DOUBLEBUFFER);
  85
  86         if(opts.multisample>0)
  87         {
  88                 attribs.push_back(GLX_SAMPLE_BUFFERS_ARB);
  89                 attribs.push_back(opts.multisample);
  90         }
  91
  92         attribs.push_back(0);
  93
  94         ::Display *dpy=display.get_display();
  95
  96         XVisualInfo *vi=glXChooseVisual(dpy, DefaultScreen(dpy), &attribs.front());
  97         if(!vi)
  98                 throw Exception("Couldn't find a suitable GLX visual");
  99         context=glXCreateContext(dpy, vi, 0, true);
 100
 101         XSetWindowAttributes attr;
 102         attr.colormap=XCreateColormap(dpy, DefaultRootWindow(dpy), vi->visual, AllocNone);
 103
 104         subwnd=XCreateWindow(dpy, window.get_handle(), 0, 0, window.get_width(), window.get_height(), 0, vi->depth, InputOutput, vi->visual, CWColormap, &attr);
 105         XMapWindow(display.get_display(), subwnd);
 106
 107         XFree(vi);
 108
 109         glXMakeCurrent(dpy, subwnd, context);
 110
 111         window.signal_resize.connect(sigc::mem_fun(this, &GLContext::window_resized));
 112 #endif
 113 }
 114
 115 GLContext::~GLContext()
 116 {
 117 #ifdef WIN32
 118         wglMakeCurrent(0, 0);
 119         wglDeleteContext(context);
 120 #else
 121         ::Display *dpy=display.get_display();
 122
 123         glXMakeCurrent(dpy, 0, 0);
 124         glXDestroyContext(dpy, context);
 125         XDestroyWindow(dpy, subwnd);
 126 #endif
 127 }
 128
 129 void GLContext::swap_buffers()
 130 {
 131 #ifdef WIN32
 132         HDC dc=GetDC(window.get_handle());
 133         SwapBuffers(dc);
 134         ReleaseDC(window.get_handle(), dc);
 135 #else
 136         glXSwapBuffers(display.get_display(), subwnd);
 137 #endif
 138 }
 139
 140 void GLContext::window_resized(unsigned w, unsigned h)
 141 {
 142 #ifndef WIN32
 143         XMoveResizeWindow(display.get_display(), subwnd, 0, 0, w, h);
 144 #endif
 145         glViewport(0, 0, w, h);
 146 }
 147
 148 } // namespace Graphics
 149 } // namespace Msp