source/graphics/wgl/glcontext.cpp

   1 #include <windows.h>
   2 #include <GL/gl.h>
   3 #include "glcontext.h"
   4 #include "window_private.h"
   5
   6 namespace Msp {
   7 namespace Graphics {
   8
   9 typedef HGLRC ContextHandle;
  10
  11 struct GLContext::Private
  12 {
  13         ContextHandle context;
  14 };
  15
  16
  17 void GLContext::platform_init(const GLOptions &opts)
  18 {
  19         priv = new Private;
  20
  21         HDC dc = GetDC(window.get_private().window);
  22
  23         PIXELFORMATDESCRIPTOR pfd;
  24         memset(&pfd, 0, sizeof(pfd));
  25
  26         pfd.nSize = sizeof(pfd);
  27         pfd.nVersion = 1;
  28         pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL;
  29         if(opts.doublebuffer)
  30                 pfd.dwFlags |= PFD_DOUBLEBUFFER;
  31         pfd.iPixelType = PFD_TYPE_RGBA;
  32         if(opts.alpha)
  33                 pfd.cAlphaBits = 1;
  34         pfd.cDepthBits = 1;
  35         if(opts.stencil)
  36                 pfd.cStencilBits = 1;
  37
  38         int pf_index = ChoosePixelFormat(dc, &pfd);
  39         if(!pf_index)
  40                 throw unsupported_gl_mode(opts);
  41         SetPixelFormat(dc, pf_index, &pfd);
  42
  43         priv->context = wglCreateContext(dc);
  44         wglMakeCurrent(dc, priv->context);
  45
  46         ReleaseDC(window.get_private().window, dc);
  47 }
  48
  49 GLContext::~GLContext()
  50 {
  51         wglMakeCurrent(0, 0);
  52         wglDeleteContext(priv->context);
  53
  54         delete priv;
  55 }
  56
  57 void GLContext::swap_buffers()
  58 {
  59         HDC dc = GetDC(window.get_private().window);
  60         SwapBuffers(dc);
  61         ReleaseDC(window.get_private().window, dc);
  62 }
  63
  64 void GLContext::window_resized(unsigned w, unsigned h)
  65 {
  66         glViewport(0, 0, w, h);
  67 }
  68
  69 } // namespace Graphics
  70 } // namespace Msp