// DWORD GetLastError(VOID);
// ############################################################################
// ############################################################################
// ############################################################################
// ############################################################################
// ============================================================================
// The following function, DemoCreateRenderingContext(ref_uint_DC,ref_uint_RC),
// can be used as a simple way to create an OpenGL "Rendering Context" (RC).
// **** DO NOT CALL DemoCreateRenderingContext() DIRECTLY IF YOU CHOOSE TO
// CALL DemoInitOpenGL() (below) TO ESTABLISH OPENGL. ****
// ============================================================================
public static unsafe void DemoCreateRenderingContext
(
ref uint ref_uint_DC,
ref uint ref_uint_RC
)
{
ref_uint_RC = 0;
PIXELFORMATDESCRIPTOR pfd = new PIXELFORMATDESCRIPTOR();
// --------------------------------------------------------------------------
pfd.nSize = 40; // sizeof(PIXELFORMATDESCRIPTOR);
pfd.nVersion = 1;
pfd.dwFlags = (PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER);
pfd.iPixelType = (byte)(PFD_TYPE_RGBA);
pfd.cColorBits = 32;
pfd.cRedBits = 0;
pfd.cRedShift = 0;
pfd.cGreenBits = 0;
pfd.cGreenShift = 0;
pfd.cBlueBits = 0;
pfd.cBlueShift = 0;
pfd.cAlphaBits = 0;
pfd.cAlphaShift = 0;
pfd.cAccumBits = 0;
pfd.cAccumRedBits = 0;
pfd.cAccumGreenBits = 0;
pfd.cAccumBlueBits = 0;
pfd.cAccumAlphaBits = 0;
pfd.cDepthBits = 32;
pfd.cStencilBits = 0;
pfd.cAuxBuffers = 0;
pfd.iLayerType = (byte)(PFD_MAIN_PLANE);
pfd.bReserved = 0;
pfd.dwLayerMask = 0;
pfd.dwVisibleMask = 0;
pfd.dwDamageMask = 0;
// --------------------------------------------------------------------------
// --------------------------------------------------------------------------
// Choose Pixel Format
// --------------------------------------------------------------------------
int iPixelFormat = 0;
PIXELFORMATDESCRIPTOR *_pfd = &pfd;
iPixelFormat = WGL.ChoosePixelFormat(ref_uint_DC, _pfd);
if (0 == iPixelFormat)
{
uint uint_LastError = WGL.GetLastError();
string string_Message = "ChoosePixelFormat() FAILED: Error: " + uint_LastError;
WGL.MessageBox(0, string_Message, "WGL.DemoGetRenderingContext() : ERROR", MB_OK);
return;
}
// --------------------------------------------------------------------------
// --------------------------------------------------------------------------
// Set Pixel Format
// --------------------------------------------------------------------------
int int_Result_SPF = 0;
int_Result_SPF = WGL.SetPixelFormat(ref_uint_DC, iPixelFormat, _pfd);
if (0 == int_Result_SPF)
{
uint uint_LastError = WGL.GetLastError();
string string_Message = "SetPixelFormat() FAILED. Error: " + uint_LastError;
WGL.MessageBox(0, string_Message, "WGL.DemoGetRenderingContext() : ERROR", MB_OK);
return;
}
// --------------------------------------------------------------------------
// --------------------------------------------------------------------------
// Create Rendering Context (RC)
// NOTE: You will get the following error:
// 126 : ERROR_MOD_NOT_FOUND
// if you attempt to create a render context too soon after creating a
// window and getting its Device Context (DC).
// See the comments for WGL.DemoInitOpenGL() on how to use a call to
// WGL.wglSwapBuffers( ref_uint_DC ) before attempting to create the RC.
// --------------------------------------------------------------------------
ref_uint_RC = WGL.wglCreateContext(ref_uint_DC);
if (0 == ref_uint_RC)
{
uint uint_LastError = WGL.GetLastError();
string string_Message = "wglCreateContext() FAILED. Error: " + uint_LastError;
WGL.MessageBox(0, string_Message, "WGL.DemoGetRenderingContext() : ERROR", MB_OK);
return;
}
// --------------------------------------------------------------------------
// --------------------------------------------------------------------------
// Make the new Render Context (RC) the current Render Context (RC)
// --------------------------------------------------------------------------
int int_Result_MC = 0;
int_Result_MC = WGL.wglMakeCurrent(ref_uint_DC, ref_uint_RC);
if (0 == int_Result_MC)
{
uint uint_LastError = WGL.GetLastError();
string string_Message = "wglMakeCurrent() FAILED. Error: " + uint_LastError;
WGL.MessageBox(0, string_Message, "WGL.DemoGetRenderingContext() : ERROR", MB_OK);
// ***************************
WGL.wglDeleteContext(ref_uint_RC);
ref_uint_RC = 0;
// ***************************
return;
}
// --------------------------------------------------------------------------
}