source/graphics/wgl/glcontext.cpp

   1 #include <windows.h>
   2 #include <GL/gl.h>
   3 #include <GL/wglext.h>
   4 #include "glcontext.h"
   5 #include "window_private.h"
   6
   7 using namespace std;
   8
   9 namespace Msp {
  10 namespace Graphics {
  11
  12 typedef HGLRC ContextHandle;
  13
  14 struct GLContext::Private
  15 {
  16         ContextHandle context;
  17 };
  18
  19
  20 void GLContext::platform_init(const GLOptions &opts)
  21 {
  22         HDC dc = GetDC(window.get_private().window);
  23
  24         PIXELFORMATDESCRIPTOR pfd;
  25         memset(&pfd, 0, sizeof(pfd));
  26
  27         pfd.nSize = sizeof(pfd);
  28         pfd.nVersion = 1;
  29         pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL;
  30         if(opts.doublebuffer)
  31                 pfd.dwFlags |= PFD_DOUBLEBUFFER;
  32         pfd.iPixelType = PFD_TYPE_RGBA;
  33         if(opts.alpha)
  34                 pfd.cAlphaBits = 1;
  35         pfd.cDepthBits = 1;
  36         if(opts.stencil)
  37                 pfd.cStencilBits = 1;
  38
  39         int pf_index = ChoosePixelFormat(dc, &pfd);
  40         if(!pf_index)
  41                 throw unsupported_gl_mode(opts);
  42         SetPixelFormat(dc, pf_index, &pfd);
  43
  44         priv = new Private;
  45         priv->context = wglCreateContext(dc);
  46         wglMakeCurrent(dc, priv->context);
  47
  48         ReleaseDC(window.get_private().window, dc);
  49 }
  50
  51 GLContext::~GLContext()
  52 {
  53         wglMakeCurrent(0, 0);
  54         wglDeleteContext(priv->context);
  55
  56         delete priv;
  57 }
  58
  59 void GLContext::set_swap_interval(unsigned i)
  60 {
  61         PFNWGLSWAPINTERVALEXTPROC func = reinterpret_cast<PFNWGLSWAPINTERVALEXTPROC>(wglGetProcAddress("wglSwapIntervalEXT"));
  62         if(!func)
  63                 throw runtime_error("wglSwapIntervalEXT not found");
  64         func(i);
  65 }
  66
  67 void GLContext::swap_buffers()
  68 {
  69         HDC dc = GetDC(window.get_private().window);
  70         SwapBuffers(dc);
  71         ReleaseDC(window.get_private().window, dc);
  72 }
  73
  74 void GLContext::window_resized(unsigned, unsigned)
  75 { }
  76
  77 } // namespace Graphics
  78 } // namespace Msp