building up to emu

secretemu · Mar 8, 2005

hi im into emu but i am way to inexperienced

aperbag: (in denial)
so im building my skills in open gl (i use the dev c++ enviroment)
im trying to create a program to create and edit 3d objects
but im stuck on a strange problem i tried 3 forums already including source forge
but got no solution so i figured you guys are really good a emu so maby ye could help.

before i create the differend views (plan,elevation,etc) :icecream:
i have to enable gl for each window. as a test i try to load a 2d animation in each window. but it only appears in the last window created. i know it might seem like a simple problem but i even tried each window seperately but with no success. :bye3:
thanks in advanced for any reply

arty:

ZeroEffect · Mar 8, 2005

How are you creating your seperate views? When you say "enable gl for each window", how are you accomplishing this?

A good approach to multiple views is to create one gl window then for each view:
1) set the viewport to draw to the correct region of the screen
2) set you camera (view/proj matrix) for the view
3) draw
*Repeat for each view*

OpenGL Forums: Gamedev.net
OpenGL Tutorials: NeHe

secretemu · Mar 8, 2005

here is me source code
( dont know exactly how to manipulate the view ports yet)
i never put in every thing for hWnd2 yet(this proberly looks messey)

#include <windows.h>
#include <gl/gl.h>

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);

int WINAPI WinMain (HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int iCmdShow)
{
WNDCLASS wc;
HWND main ,hWnd,hWnd2;
HDC hDC;
HGLRC hRC;
MSG msg;
BOOL bQuit = FALSE;
float theta = 0.0f;

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);

main = CreateWindow (
"GLSample", "OpenGL Sample",
WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE,
0, 0, 800, 600,
NULL, NULL, hInstance, NULL);

hWnd = CreateWindow (
"GLSample", "OpenGL Sample",
WS_CAPTION | WS_CHILD | WS_VISIBLE, // Only put in ws caption to show where different menus are
0, 0, 256, 256,
main, NULL, hInstance, NULL);
/* enable OpenGL for the window */
EnableOpenGL (hWnd, &hDC, &hRC);
/* create main window */
hWnd2 = CreateWindow (
"GLSample", "OpenGL Sample",
WS_CAPTION | WS_CHILD | WS_VISIBLE, // Only put in ws caption to show where different menus are
0, 0, 256, 256,
main, NULL, hInstance, NULL);
/* enable OpenGL for the window */
EnableOpenGL (hWnd, &hDC, &hRC);

while (!bQuit)
{

if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))
{

if (msg.message == WM_QUIT)
{
bQuit = TRUE;
}
else
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}
}
else
{
/* OpenGL animation code */

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

glPushMatrix ();

glBegin(GL_TRIANGLES); // Start Drawing A Triangle
glColor3f(1.0f,0.0f,0.0f); glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Front)
glColor3f(0.0f,1.0f,0.0f); // Green
glVertex3f(-1.0f,-1.0f, 1.0f); // Left Of Triangle (Front)
glColor3f(0.0f,0.0f,1.0f); // Blue
glVertex3f( 1.0f,-1.0f, 1.0f); // Right Of Triangle (Front)
glColor3f(1.0f,0.0f,0.0f); // Red
glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Right)
glColor3f(0.0f,0.0f,1.0f); // Blue
glVertex3f( 1.0f,-1.0f, 1.0f); // Left Of Triangle (Right)
glColor3f(0.0f,1.0f,0.0f); // Green
glVertex3f( 1.0f,-1.0f, -1.0f); // Right Of Triangle (Right)
glColor3f(1.0f,0.0f,0.0f); // Red
glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Back)
glColor3f(0.0f,1.0f,0.0f); // Green
glVertex3f( 1.0f,-1.0f, -1.0f); // Left Of Triangle (Back)
glColor3f(0.0f,0.0f,1.0f); // Blue
glVertex3f(-1.0f,-1.0f, -1.0f); // Right Of Triangle (Back)
glColor3f(1.0f,0.0f,0.0f); // Red
glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Left)
glColor3f(0.0f,0.0f,1.0f); // Blue
glVertex3f(-1.0f,-1.0f,-1.0f); // Left Of Triangle (Left)
glColor3f(0.0f,1.0f,0.0f); // Green
glVertex3f(-1.0f,-1.0f, 1.0f); // Right Of Triangle (Left)
glEnd();
glPopMatrix ();

SwapBuffers (hDC);

theta += 1.0f;
Sleep (1);
}
}

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

DestroyWindow (hWnd);

return msg.wParam;
}

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

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);
}
}

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

*hDC = GetDC (hWnd);

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;
iFormat = ChoosePixelFormat (*hDC, &pfd);
SetPixelFormat (*hDC, iFormat, &pfd);

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

}

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

ZeroEffect · Mar 8, 2005

The problem is you only have one device context. You associate it with the first child window you create and then break it when you create the second child window. This is partially why only the last window was displaying an image. The other reason is that you must use wglMakeCurrent() to switch between windows when you execute your drawing function. You must call draw for each window.

Managing such a setup can become problematic and depending on your needs, check out the glViewport() function. It may simplify your needs.

I've hacked together a quick solution in your initial code for your problem. And, just as an aside, you don't need to pass handles as pointers (in EnableOpenGL()) handles are already pointers to pointers

Good Luck!

Code:

#include <windows.h>
#include <gl/gl.h>

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);



int WINAPI WinMain (HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int iCmdShow)
{
WNDCLASS wc;
HWND main ,hWnd,hWnd2;
HDC hDC, hDC2;
HGLRC hRC;
HGLRC hRC2;
MSG msg;
BOOL bQuit = FALSE;
float theta = 0.0f;


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);


main = CreateWindow (
"GLSample", "OpenGL Sample",
WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE,
0, 0, 800, 600,
NULL, NULL, hInstance, NULL);

hWnd = CreateWindow (
"GLSample", "OpenGL Child1",
WS_CAPTION | WS_CHILD | WS_VISIBLE, // Only put in ws caption to show where different menus are
0, 0, 256, 256,
main, NULL, hInstance, NULL);
/* enable OpenGL for the window */
EnableOpenGL (hWnd, &hDC, &hRC);

hWnd2 = CreateWindow (
"GLSample", "OpenGL Child2",
WS_CAPTION | WS_CHILD | WS_VISIBLE, // Only put in ws caption to show where different menus are
256, 256, 256, 256,
main, NULL, hInstance, NULL);
/* enable OpenGL for the window */
EnableOpenGL (hWnd2, &hDC2, &hRC2);



while (!bQuit)
{

if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))
{

if (msg.message == WM_QUIT)
{
bQuit = TRUE;
}
else
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}
}
else
{
/* OpenGL animation code */

wglMakeCurrent( hDC, hRC );

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

glPushMatrix ();

glBegin(GL_TRIANGLES); // Start Drawing A Triangle
glColor3f(1.0f,0.0f,0.0f); glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Front)
glColor3f(0.0f,1.0f,0.0f); // Green
glVertex3f(-1.0f,-1.0f, 1.0f); // Left Of Triangle (Front)
glColor3f(0.0f,0.0f,1.0f); // Blue
glVertex3f( 1.0f,-1.0f, 1.0f); // Right Of Triangle (Front)
glColor3f(1.0f,0.0f,0.0f); // Red
glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Right)
glColor3f(0.0f,0.0f,1.0f); // Blue
glVertex3f( 1.0f,-1.0f, 1.0f); // Left Of Triangle (Right)
glColor3f(0.0f,1.0f,0.0f); // Green
glVertex3f( 1.0f,-1.0f, -1.0f); // Right Of Triangle (Right)
glColor3f(1.0f,0.0f,0.0f); // Red
glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Back)
glColor3f(0.0f,1.0f,0.0f); // Green
glVertex3f( 1.0f,-1.0f, -1.0f); // Left Of Triangle (Back)
glColor3f(0.0f,0.0f,1.0f); // Blue
glVertex3f(-1.0f,-1.0f, -1.0f); // Right Of Triangle (Back)
glColor3f(1.0f,0.0f,0.0f); // Red
glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Left)
glColor3f(0.0f,0.0f,1.0f); // Blue
glVertex3f(-1.0f,-1.0f,-1.0f); // Left Of Triangle (Left)
glColor3f(0.0f,1.0f,0.0f); // Green
glVertex3f(-1.0f,-1.0f, 1.0f); // Right Of Triangle (Left)
glEnd();
glPopMatrix ();

SwapBuffers (hDC);

wglMakeCurrent( hDC2, hRC2 );

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

glPushMatrix ();

glBegin(GL_TRIANGLES); // Start Drawing A Triangle
glColor3f(1.0f,0.0f,0.0f); glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Front)
glColor3f(0.0f,1.0f,0.0f); // Green
glVertex3f(-1.0f,-1.0f, 1.0f); // Left Of Triangle (Front)
glColor3f(0.0f,0.0f,1.0f); // Blue
glVertex3f( 1.0f,-1.0f, 1.0f); // Right Of Triangle (Front)
glColor3f(1.0f,0.0f,0.0f); // Red
glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Right)
glColor3f(0.0f,0.0f,1.0f); // Blue
glVertex3f( 1.0f,-1.0f, 1.0f); // Left Of Triangle (Right)
glColor3f(0.0f,1.0f,0.0f); // Green
glVertex3f( 1.0f,-1.0f, -1.0f); // Right Of Triangle (Right)
glColor3f(1.0f,0.0f,0.0f); // Red
glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Back)
glColor3f(0.0f,1.0f,0.0f); // Green
glVertex3f( 1.0f,-1.0f, -1.0f); // Left Of Triangle (Back)
glColor3f(0.0f,0.0f,1.0f); // Blue
glVertex3f(-1.0f,-1.0f, -1.0f); // Right Of Triangle (Back)
glColor3f(1.0f,0.0f,0.0f); // Red
glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Left)
glColor3f(0.0f,0.0f,1.0f); // Blue
glVertex3f(-1.0f,-1.0f,-1.0f); // Left Of Triangle (Left)
glColor3f(0.0f,1.0f,0.0f); // Green
glVertex3f(-1.0f,-1.0f, 1.0f); // Right Of Triangle (Left)
glEnd();
glPopMatrix ();

SwapBuffers (hDC2);



theta += 1.0f;
Sleep (1);
}
}

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


DestroyWindow (hWnd);

return msg.wParam;
}




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

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);
}
}




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


*hDC = GetDC (hWnd);


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;
iFormat = ChoosePixelFormat (*hDC, &pfd);
SetPixelFormat (*hDC, iFormat, &pfd);

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

}




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

zenogais · Mar 9, 2005

Why not use MDI, it would certainly make window management and redrawing much simpler. You can find a good tutorial on it HERE.

BGNG · Mar 9, 2005

An alternative to what ZeroEffect suggested, you can also configure your GL framebuffer to work on two simultaneous viewports. Tutorial 42 at NeHe's site describes how to do this: http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=42

secretemu · Mar 12, 2005

IM BACK :evil:

i patched up on my win 32 knowledge a created this small example of a debugger
kinda inaway i didnt make it debug anything just convert an entered number to
xor. one quick question for anyone how knows. how do you load things like menus and boxes like combo boxes etc.. in xp style
any help would be great. thanks

BGNG · Mar 12, 2005

XOr? You must mean hexadecimal, 'cause that's what it's doing.

As for XP stuff, I'm not sure exactly how to do that natively in C++... But I do know that in VB or ANY language, you can use a little manifest file (explained and provided at http://vbnet.mvps.org/) to force any program that calls the InitCommonControls() API call to make the entire program use XP styles.

smcd · Mar 12, 2005

Your program locks up if you enter "0" to be converted. hehe

Also, the "Console" menu, "close" is a rather pointless option since once the console is open, the GUI becomes unresponsive.

ShizZy · Mar 14, 2005

Hahah... I don't think it likes me :happy: Otherwise, not bad. As for doing those sorts of things in Win32, the CreateWindow Class can be used to create anything from actual windows, to toolbars, to status bars:
http://msdn.microsoft.com/library/d...dowreference/windowfunctions/createwindow.asp

A really good place to snoop around for code snippets and tutorials would be http://www.codeproject.com/

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building up to emu

secretemu

Future Emu Creator Hopefully

ZeroEffect

New member

secretemu

Future Emu Creator Hopefully

ZeroEffect

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zenogais

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BGNG

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secretemu

Future Emu Creator Hopefully

BGNG

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smcd

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ShizZy

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