I know c++ , but Im beginner when it comes to win32 windowing. im trying to integrate into win32 opengl legacy code the simple AntTweakBar GUI lib . I tried to do it like it showed in the AntTweakBar examples, but the key pressing is out of sync
And acting much wired. , I can’t change the legacy code very much and this is the best I did. Win32 experts what I did wrong here? (this is short example )



// Includes

#include <windows.h>
#include <gl/gl.h>
//AntTweakBar
#include <AntTweakBar.h>
// Function Declarations

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
void EnableOpenGL(HWND hWnd, HDC * hDC, HGLRC * hRC);
void DisableOpenGL(HWND hWnd, HDC hDC, HGLRC hRC);

// WinMain
// Win32 MessageProc callback




int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int iCmdShow)
{


int numSec = 100; // number of strip sections
int width = 556, height = 556;
int bpp, flags;
int TWquit = 0;
TwBar *bar;
int n, numCubes = 30;
float color0[] = { 1.0f, 0.5f, 0.0f };
float color1[] = { 0.5f, 1.0f, 0.0f };
float color[] = { 1, 0, 0 }; // strip color
double ka = 5.3, kb = 1.7, kc = 4.1;

WNDCLASS wc;
HWND hWnd;
HDC hDC;
HGLRC hRC;
MSG msg;
BOOL quit = FALSE;
float theta = 0.0f;

// register window class
wc.style = CS_OWNDC;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon( NULL, IDI_APPLICATION );
wc.hCursor = LoadCursor( NULL, IDC_ARROW );
wc.hbrBackground = (HBRUSH)GetStockObject( BLACK_BRUSH );
wc.lpszMenuName = NULL;
wc.lpszClassName = "GLSample";
RegisterClass( &wc );

// create main window
hWnd = CreateWindow(
"GLSample", "OpenGL Sample",
WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE,
0, 0, width, height,
NULL, NULL, hInstance, NULL );

// enable OpenGL for the window
EnableOpenGL( hWnd, &hDC, &hRC );


// Initialize AntTweakBar
TwInit(TW_OPENGL, NULL);

// Tell the window size to AntTweakBar
TwWindowSize(width, height);


// Create a tweak bar
bar = TwNewBar("TweakBar");
TwDefine(" GLOBAL help='This example shows how to integrate AntTweakBar in a DirectX9 application.' "); // Message added to the help bar.
TwDefine(" TweakBar color='128 224 160' text=dark "); // Change TweakBar color and use dark text
TwDefine(" TweakBar position='200 40' ");

// Add 'numSec' to 'bar': it is a modifiable (RW) variable of type TW_TYPE_INT32. Its shortcuts are [s] and [S].
TwAddVarRW(bar, "NumSec", TW_TYPE_INT32, &numSec,
" label='Strip length' min=1 max=1000 keyIncr=s keyDecr=S help='Number of segments of the strip.' ");

// Add 'color' to 'bar': it is a modifiable variable of type TW_TYPE_COLOR3F (3 floats color)
TwAddVarRW(bar, "Color", TW_TYPE_COLOR3F, &color, " label='Strip color' ");




// program main loop
while ( !quit )
{

// check for messages
if ( PeekMessage( &msg, NULL, 0, 0, PM_REMOVE ) )
{

// handle or dispatch messages
if ( msg.message == WM_QUIT )
{
quit = TRUE;
}
else
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}

}
else
{

// OpenGL animation code goes here

glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
glClear( GL_COLOR_BUFFER_BIT );

glPushMatrix();
glRotatef( theta, 0.0f, 0.0f, 1.0f );
glBegin( GL_TRIANGLES );
glColor3f( 1.0f, 0.0f, 0.0f ); glVertex2f( 0.0f, 1.0f );
glColor3f( 0.0f, 1.0f, 0.0f ); glVertex2f( 0.87f, -0.5f );
glColor3f( 0.0f, 0.0f, 1.0f ); glVertex2f( -0.87f, -0.5f );
glEnd();
glPopMatrix();


// Draw tweak bars
TwDraw();

SwapBuffers( hDC );

theta += 1.0f;

}

}

// shutdown OpenGL
DisableOpenGL( hWnd, hDC, hRC );

// destroy the window explicitly
DestroyWindow( hWnd );
// Terminate AntTweakBar
TwTerminate();
return msg.wParam;

}

// Window Procedure

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{

// Send event message to AntTweakBar
if( TwEventWin(hWnd, message, wParam, lParam) )
return 0; // Event has been handled by AntTweakBar


switch (message)
{

case WM_CREATE:
return 0;

case WM_CLOSE:
PostQuitMessage( 0 );
return 0;

case WM_DESTROY:
return 0;

case WM_KEYDOWN:
switch ( wParam )
{

case VK_ESCAPE:
PostQuitMessage(0);
return 0;

}
return 0;

default:
return DefWindowProc( hWnd, message, wParam, lParam );

}

}

// Enable OpenGL

void EnableOpenGL(HWND hWnd, HDC * hDC, HGLRC * hRC)
{
PIXELFORMATDESCRIPTOR pfd;
int format;

// get the device context (DC)
*hDC = GetDC( hWnd );

// set the pixel format for the DC
ZeroMemory( &pfd, sizeof( pfd ) );
pfd.nSize = sizeof( pfd );
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cDepthBits = 16;
pfd.iLayerType = PFD_MAIN_PLANE;
format = ChoosePixelFormat( *hDC, &pfd );
SetPixelFormat( *hDC, format, &pfd );

// create and enable the render context (RC)
*hRC = wglCreateContext( *hDC );
wglMakeCurrent( *hDC, *hRC );

}

// Disable OpenGL

void DisableOpenGL(HWND hWnd, HDC hDC, HGLRC hRC)
{
wglMakeCurrent( NULL, NULL );
wglDeleteContext( hRC );
ReleaseDC( hWnd, hDC );
}