source/graphics/glx/glcontext.cpp

   1 #include <vector>
   2 #include <GL/gl.h>
   3 #include <GL/glx.h>
   4 #include "glcontext.h"
   5 #include "display_private.h"
   6 #include "window_private.h"
   7
   8 using namespace std;
   9
  10 namespace Msp {
  11 namespace Graphics {
  12
  13 typedef GLXContext ContextHandle;
  14
  15 struct GLContext::Private
  16 {
  17         ContextHandle context;
  18         // We need to create a window with the chosen visual
  19         WindowHandle subwnd;
  20 };
  21
  22
  23 void GLContext::platform_init(const GLOptions &opts)
  24 {
  25         vector<int> attribs;
  26
  27         attribs.push_back(GLX_RGBA);
  28         attribs.push_back(GLX_DEPTH_SIZE);
  29         attribs.push_back(1);
  30
  31         if(opts.alpha)
  32         {
  33                 attribs.push_back(GLX_ALPHA_SIZE);
  34                 attribs.push_back(1);
  35         }
  36
  37         if(opts.stencil)
  38         {
  39                 attribs.push_back(GLX_STENCIL_SIZE);
  40                 attribs.push_back(1);
  41         }
  42
  43         if(opts.doublebuffer)
  44                 attribs.push_back(GLX_DOUBLEBUFFER);
  45
  46         if(opts.multisample>0)
  47         {
  48                 attribs.push_back(GLX_SAMPLE_BUFFERS_ARB);
  49                 attribs.push_back(1);
  50                 attribs.push_back(GLX_SAMPLES_ARB);
  51                 attribs.push_back(opts.multisample);
  52         }
  53
  54         attribs.push_back(0);
  55
  56         DisplayHandle dpy = display.get_private().display;
  57
  58         XVisualInfo *vi = glXChooseVisual(dpy, DefaultScreen(dpy), &attribs.front());
  59         if(!vi)
  60                 throw unsupported_gl_mode(opts);
  61
  62         priv = new Private;
  63         priv->context = glXCreateContext(dpy, vi, 0, true);
  64
  65         XSetWindowAttributes attr;
  66         attr.colormap = XCreateColormap(dpy, DefaultRootWindow(dpy), vi->visual, AllocNone);
  67
  68         priv->subwnd = XCreateWindow(dpy, window.get_private().window, 0, 0, window.get_width(), window.get_height(), 0, vi->depth, InputOutput, vi->visual, CWColormap, &attr);
  69         XMapWindow(dpy, priv->subwnd);
  70
  71         XFree(vi);
  72
  73         glXMakeCurrent(dpy, priv->subwnd, priv->context);
  74 }
  75
  76 GLContext::~GLContext()
  77 {
  78         DisplayHandle dpy = display.get_private().display;
  79
  80         glXMakeCurrent(dpy, 0, 0);
  81         glXDestroyContext(dpy, priv->context);
  82         XDestroyWindow(dpy, priv->subwnd);
  83
  84         delete priv;
  85 }
  86
  87 void GLContext::swap_buffers()
  88 {
  89         glXSwapBuffers(display.get_private().display, priv->subwnd);
  90 }
  91
  92 void GLContext::window_resized(unsigned w, unsigned h)
  93 {
  94         XMoveResizeWindow(display.get_private().display, priv->subwnd, 0, 0, w, h);
  95         glViewport(0, 0, w, h);
  96 }
  97
  98 } // namespace Graphics
  99 } // namespace Msp