opengl+delphi 鼠标拾取
h_DC) = 0)) then
begin
MessageBox(0, 'Release of device context failed!', 'Error', MB_OK or MB_ICONERROR);
h_DC := 0;
end;
// Attempts to destroy the window
if ((h_Wnd <> 0) and (not DestroyWindow(h_Wnd))) then
begin
MessageBox(0, 'Unable to destroy window!', 'Error', MB_OK or MB_ICONERROR);
h_Wnd := 0;
end;
// Attempts to unregister the window class
if (not UnRegisterClass('OpenGL', hInstance)) then
begin
MessageBox(0, 'Unable to unregister window class!', 'Error', MB_OK or MB_ICONERROR);
hInstance := 0;
end;
end;
{--------------------------------------------------------------------}
{ Creates the window and attaches a OpenGL rendering context to it }
{--------------------------------------------------------------------}
function glCreateWnd(Width, Height : Integer; Fullscreen : Boolean; PixelDepth : Integer) : Boolean;
var
wndClass : TWndClass; // Window class
dwStyle : DWORD; // Window styles
dwExStyle : DWORD; // Extended window styles
dmScreenSettings : DEVMODE; // Screen settings (fullscreen, etc...)
PixelFormat : GLuint; // Settings for the OpenGL rendering
h_Instance : HINST; // Current instance
pfd : TPIXELFORMATDESCRIPTOR; // Settings for the OpenGL window
begin
h_Instance := GetModuleHandle(nil); //Grab An Instance For Our Window
ZeroMemory(@wndClass, SizeOf(wndClass)); // Clear the window class structure
with wndClass do // Set up the window class
begin
style := CS_HREDRAW or // Redraws entire window if length changes
CS_VREDRAW or // Redraws entire window if height changes
CS_OWNDC; // Unique device context for the window
lpfnWndProc := @WndProc; // Set the window procedure to our func WndProc
hInstance := h_Instance;
hCursor := LoadCursor(0, IDC_ARROW);
lpszClassName := 'OpenGL';
end;
if (RegisterClass(wndClass) = 0) then // Attemp to register the window class
begin
MessageBox(0, 'Failed to register the window class!', 'Error', MB_OK or MB_ICONERROR);
Result := False;
Exit
end;
// Change to fullscreen if so desired
if Fullscreen then
begin
ZeroMemory(@dmScreenSettings, SizeOf(dmScreenSettings));
with dmScreenSettings do begin // Set parameters for the screen setting
dmSize := SizeOf(dmScreenSettings);
dmPelsWidth := Width; // Window width
dmPelsHeight := Height; // Window height
dmBitsPerPel := PixelDepth; // Window color depth
dmFields := DM_PELSWIDTH or DM_PELSHEIGHT or DM_BITSPERPEL;
end;
// Try to change scre
en mode to fullscreen
if (ChangeDisplaySettings(dmScreenSettings, CDS_FULLSCREEN) = DISP_CHANGE_FAILED) then
begin
MessageBox(0, 'Unable to s