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         priv = new Private;
  26
  27         vector<int> attribs;
  28
  29         attribs.push_back(GLX_RGBA);
  30         attribs.push_back(GLX_DEPTH_SIZE);
  31         attribs.push_back(1);
  32
  33         if(opts.alpha)
  34         {
  35                 attribs.push_back(GLX_ALPHA_SIZE);
  36                 attribs.push_back(1);
  37         }
  38
  39         if(opts.stencil)
  40         {
  41                 attribs.push_back(GLX_STENCIL_SIZE);
  42                 attribs.push_back(1);
  43         }
  44
  45         if(opts.doublebuffer)
  46                 attribs.push_back(GLX_DOUBLEBUFFER);
  47
  48         if(opts.multisample>0)
  49         {
  50                 attribs.push_back(GLX_SAMPLE_BUFFERS_ARB);
  51                 attribs.push_back(1);
  52                 attribs.push_back(GLX_SAMPLES_ARB);
  53                 attribs.push_back(opts.multisample);
  54         }
  55
  56         attribs.push_back(0);
  57
  58         DisplayHandle dpy = display.get_private().display;
  59
  60         XVisualInfo *vi = glXChooseVisual(dpy, DefaultScreen(dpy), &attribs.front());
  61         if(!vi)
  62                 throw unsupported_gl_mode(opts);
  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