tests/glean/rc.cpp

   1 // BEGIN_COPYRIGHT -*- glean -*-
   2 //
   3 // Copyright (C) 1999  Allen Akin   All Rights Reserved.
   4 //
   5 // Permission is hereby granted, free of charge, to any person
   6 // obtaining a copy of this software and associated documentation
   7 // files (the "Software"), to deal in the Software without
   8 // restriction, including without limitation the rights to use,
   9 // copy, modify, merge, publish, distribute, sublicense, and/or
  10 // sell copies of the Software, and to permit persons to whom the
  11 // Software is furnished to do so, subject to the following
  12 // conditions:
  13 //
  14 // The above copyright notice and this permission notice shall be
  15 // included in all copies or substantial portions of the
  16 // Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
  19 // KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
  20 // WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  21 // PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL ALLEN AKIN BE
  22 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23 // AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
  24 // OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  25 // DEALINGS IN THE SOFTWARE.
  26 //
  27 // END_COPYRIGHT
  28
  29
  30
  31
  32 // rc.cpp:  implementation of rendering context utilities
  33
  34 #include <iostream>
  35 #include <algorithm>
  36 #include "rc.h"
  37 #include "dsconfig.h"
  38 #include "winsys.h"
  39
  40 namespace {
  41
  42 #if defined (__WIN__)
  43
  44 // XXX
  45 // wglCreateContext requires a handle to a device context.
  46 // The ctor of RenderingContext doesn't know which window
  47 // it is creating a surface for, only what the pixelformat
  48 // of that window is. The hDC passed to wglCreateContext
  49 // doesn't have to be the same as the one use in SwapBuffers
  50 // or wglMakeCurrent, their pixelformats have to be the
  51 // same though. A limitation is that the pixelformat of
  52 // a window can only be set once. That is why a
  53 // temporary window is created.
  54
  55
  56 HGLRC create_context(GLEAN::DrawingSurfaceConfig &c)
  57 {
  58         HWND hwnd = CreateWindow("STATIC","temp",WS_POPUP,
  59                                                          CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
  60                                                          0,0,GetModuleHandle(NULL),0);
  61
  62         if (!hwnd)
  63                 return 0;
  64
  65         HDC hDC = GetDC(hwnd);
  66         if (!hDC)
  67                 return 0;
  68
  69         PIXELFORMATDESCRIPTOR pfd;
  70
  71         if (!SetPixelFormat(hDC,c.pfdID,&pfd))
  72         {
  73                 ReleaseDC(hwnd,hDC);
  74                 DestroyWindow(hwnd);
  75                 return 0;
  76         }
  77
  78         HGLRC rc = wglCreateContext(hDC);
  79         if (!rc)
  80                 return 0;
  81
  82         ReleaseDC(hwnd,hDC);
  83         DestroyWindow(hwnd);
  84
  85         return rc;
  86 }
  87
  88 #endif
  89
  90 } // anonymous namespace
  91
  92
  93 namespace GLEAN {
  94
  95 ///////////////////////////////////////////////////////////////////////////////
  96 // Constructors
  97 ///////////////////////////////////////////////////////////////////////////////
  98 RenderingContext::RenderingContext(WindowSystem& ws, DrawingSurfaceConfig& c,
  99     RenderingContext* share, bool direct) {
 100
 101         // Link back to enclosing window system, so as to simplify bookkeeping:
 102         winSys = &ws;
 103         ws.contexts.push_back(this);
 104
 105 #   if defined(__X11__)
 106
 107 #       if defined(GLX_VERSION_1_3)
 108
 109         if (ws.GLXVersMajor == 1 && ws.GLXVersMinor < 3)
 110                 goto legacyMethod;
 111         // XXX Need GLX 1.3 rc constructor code
 112         // For now, just fall through.
 113
 114 #       endif
 115
 116 legacyMethod:
 117         // Create the rendering context:
 118         rc = glXCreateContext(winSys->dpy, c.vi, (share? share->rc: 0),
 119                 direct? True: False);
 120         if (!rc)
 121                 throw Error();
 122         // XXX Ideally, we would deal with X11 and GLX errors here, too
 123         // (Badmatch, BadValue, GLXBadContext, BadAlloc)
 124
 125 #   elif defined(__WIN__)
 126
 127         rc = create_context(c);
 128         if (!rc)
 129                 throw Error();
 130 #   elif defined(__AGL__)
 131         rc = aglCreateContext(c.pf, NULL);
 132         if(rc == NULL)
 133                 throw Error();
 134 #   endif
 135
 136 } // RenderingContext::RenderingContext
 137
 138 ///////////////////////////////////////////////////////////////////////////////
 139 // Destructors
 140 ///////////////////////////////////////////////////////////////////////////////
 141
 142 RenderingContext::~RenderingContext() {
 143         remove(winSys->contexts.begin(), winSys->contexts.end(), this);
 144 #   if defined(__X11__)
 145 #       if defined(GLX_VERSION_1_3)
 146                 if (winSys->GLXVersMajor == 1 && winSys->GLXVersMinor < 3)
 147                         goto legacyMethod;
 148                 // XXX Need to write GLX 1.3 rc destructor
 149                 // For now, just fall through.
 150 #       endif
 151 legacyMethod:
 152                 glXDestroyContext(winSys->dpy, rc);
 153 #   elif defined(__WIN__)
 154                 wglDeleteContext(rc);
 155 #   endif
 156 } // RenderingContext::~RenderingContext
 157
 158
 159 } // namespace GLEAN