/**
* Create GLWindow
*/
bool MakeOpenGLWindow( HWND hwnd, int width, int height, int bits )
{
GLuint PixelFormat; // Hold results after searching for a match
// pfd tells windows how we want things to be
static PIXELFORMATDESCRIPTOR pfd =
{
sizeof( PIXELFORMATDESCRIPTOR ), // Size of this pixel format descriptor
1, // Version number
PFD_DRAW_TO_WINDOW | // Format must support window
PFD_SUPPORT_OPENGL | // Format must support OpenGL
PFD_DOUBLEBUFFER, // Format must support double buffering
PFD_TYPE_RGBA, // Request an RGBA format
bits, // Select our Color depth
0, 0, 0, 0, 0, 0, // Color bits ignored
0, // No alpha buffer
0, // Shift bit ignored
0, // No accumulation bit
0, 0, 0, 0, // Accumulation bits ignored
16, // 16Bit Z-Buffer (Depth buffer)
0, // No stencil buffer
0, // No auxillary buffer
PFD_MAIN_PLANE, // Main drawing layer
0, // reserved
0, 0, 0 // Layer masks ignored.
};
// Did We Get A Device Context?
if (!(hDC=GetDC(hwnd))){
KillGLWindow(); // Reset The Display
MessageBox(NULL,"Can't Create A GL Device Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return false; // Return FALSE
}
// Did Windows Find A Matching Pixel Format?
if (!(PixelFormat=ChoosePixelFormat(hDC,&pfd))){
KillGLWindow(); // Reset The Display
MessageBox(NULL,"Can't Find A Suitable PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return false; // Return FALSE
}
// Are We Able To Set The Pixel Format?
if(!SetPixelFormat(hDC,PixelFormat,&pfd)){
KillGLWindow(); // Reset The Display
MessageBox(NULL,"Can't Set The PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return false; // Return FALSE
}
// Are We Able To Get A Rendering Context?
if (!(hRC=wglCreateContext(hDC))){
KillGLWindow(); // Reset The Display
MessageBox(NULL,"Can't Create A GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return false; // Return FALSE
}
// Try To Activate The Rendering Context
if(!wglMakeCurrent(hDC,hRC)){
KillGLWindow(); // Reset The Display
MessageBox(NULL,"Can't Activate The GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return false; // Return FALSE
}
ShowWindow(hwnd,SW_SHOW); // Show The Window
SetForegroundWindow(hwnd); // Slightly Higher Priority
SetFocus(hwnd); // Sets Keyboard Focus To The Window
ReSizeGLScene(width, height); // Set Up Our Perspective GL Screen
// Initialize Our Newly Created GL Window
if (!InitGL()){
KillGLWindow(); // Reset The Display
MessageBox(NULL,"Initialization Failed.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return false; // Return FALSE
}
// success
return true;
}
Making an OpenGL window from a MDI child
Author
Would the following function be enough to make a window an openGL window? The handle that is being passed to it is the handle of an child window of an MDI client.
When I run the program,, pretty much nothing different happens from when I wasn't trying to make the MDI child an OpenGL window.
Any ideas? Or would you like some more info? (I'd like to cut down as much as possible, since the total code will be like 400 lines)
[EDIT]
Oh no. I misread what you said and also was being distracted.
You cannot use the MDI client class for this.
Create an MDI Child using the MDICREATESTRUCT and get the hWnd by sending the MDI CLient a create message.
Then when you get the child window you can create an OpenGL context in the client area of the MDI child.
Oh no. I misread what you said and also was being distracted.
You cannot use the MDI client class for this.
Create an MDI Child using the MDICREATESTRUCT and get the hWnd by sending the MDI CLient a create message.
Then when you get the child window you can create an OpenGL context in the client area of the MDI child.
Author
Quote:Original post by qesbit
[EDIT]
Oh no. I misread what you said and also was being distracted.
You cannot use the MDI client class for this.
Create an MDI Child using the MDICREATESTRUCT and get the hWnd by sending the MDI CLient a create message.
Then when you get the child window you can create an OpenGL context in the client area of the MDI child.
How would I go about creating the OpenGL context in the MDI child?
Author
Would passing the window handle of an MDI child to this function make it an openGL window?
/** * Create GLWindow */bool MakeOpenGLWindow( HWND hwnd, int width, int height, int bits ){ GLuint PixelFormat; // Hold results after searching for a match // pfd tells windows how we want things to be static PIXELFORMATDESCRIPTOR pfd = { sizeof( PIXELFORMATDESCRIPTOR ), // Size of this pixel format descriptor 1, // Version number PFD_DRAW_TO_WINDOW | // Format must support window PFD_SUPPORT_OPENGL | // Format must support OpenGL PFD_DOUBLEBUFFER, // Format must support double buffering PFD_TYPE_RGBA, // Request an RGBA format bits, // Select our Color depth 0, 0, 0, 0, 0, 0, // Color bits ignored 0, // No alpha buffer 0, // Shift bit ignored 0, // No accumulation bit 0, 0, 0, 0, // Accumulation bits ignored 16, // 16Bit Z-Buffer (Depth buffer) 0, // No stencil buffer 0, // No auxillary buffer PFD_MAIN_PLANE, // Main drawing layer 0, // reserved 0, 0, 0 // Layer masks ignored. }; // Did We Get A Device Context? if (!(hDC=GetDC(hwnd))){ KillGLWindow(); // Reset The Display MessageBox(NULL,"Can't Create A GL Device Context.","ERROR",MB_OK|MB_ICONEXCLAMATION); return false; // Return FALSE } // Did Windows Find A Matching Pixel Format? if (!(PixelFormat=ChoosePixelFormat(hDC,&pfd))){ KillGLWindow(); // Reset The Display MessageBox(NULL,"Can't Find A Suitable PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION); return false; // Return FALSE } // Are We Able To Set The Pixel Format? if(!SetPixelFormat(hDC,PixelFormat,&pfd)){ KillGLWindow(); // Reset The Display MessageBox(NULL,"Can't Set The PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION); return false; // Return FALSE } // Are We Able To Get A Rendering Context? if (!(hRC=wglCreateContext(hDC))){ KillGLWindow(); // Reset The Display MessageBox(NULL,"Can't Create A GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION); return false; // Return FALSE } // Try To Activate The Rendering Context if(!wglMakeCurrent(hDC,hRC)){ KillGLWindow(); // Reset The Display MessageBox(NULL,"Can't Activate The GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION); return false; // Return FALSE } ShowWindow(hwnd,SW_SHOW); // Show The Window SetForegroundWindow(hwnd); // Slightly Higher Priority SetFocus(hwnd); // Sets Keyboard Focus To The Window ReSizeGLScene(width, height); // Set Up Our Perspective GL Screen // Initialize Our Newly Created GL Window if (!InitGL()){ KillGLWindow(); // Reset The Display MessageBox(NULL,"Initialization Failed.","ERROR",MB_OK|MB_ICONEXCLAMATION); return false; // Return FALSE } // success return true;}
I would say that code is not appropriate for use with MDI windows because it doesn't handle releasing the DC and making the context current for the current window. This mean it wouldn't work with more than one MDI window.
Here is some sample code you might use instead:
// header file
// source file
BTW - please excuse the poor style(this is 2 years old and I don't code like that anymore)but it's tested and it works.
sample usage:
HTH.
-Melekor
Here is some sample code you might use instead:
// header file
#ifndef __OGLWINDOW_HPP__#define __OGLWINDOW_HPP__class OGLWindow{ static PIXELFORMATDESCRIPTOR pfd; static PAINTSTRUCT ps;public: static void InitializeStatics(); static void DeInitializeStatics(); static void MakeCurrent(HDC hDC) { wglMakeCurrent(hDC, wglGetCurrentContext()); } static void SetupWindowForOGL(HWND hWnd); static void StartRender(HWND hWnd, boolean defaultsettings = TRUE); static void EndRender();};#endif// source file
#include "globals.h"#include "OGLWindow.hpp"PIXELFORMATDESCRIPTOR OGLWindow::pfd = { sizeof(PIXELFORMATDESCRIPTOR), // Size Of This Pixel Format Descriptor 1, // Version Number PFD_DRAW_TO_WINDOW | // Format Must Support Window //PFD_DRAW_TO_BITMAP | PFD_SUPPORT_OPENGL | // Format Must Support OpenGL //PFD_SUPPORT_GDI | PFD_DOUBLEBUFFER, // Must Support Double Buffering PFD_TYPE_RGBA, // Request An RGBA Format 32, // Select Our Color Depth 0, 0, 0, 0, 0, 0, // Color Bits Ignored 0, // No Alpha Buffer 0, // Shift Bit Ignored 0, // No Accumulation Buffer 0, 0, 0, 0, // Accumulation Bits Ignored 32, // 32Bit Z-Buffer (Depth Buffer) 0, // No Stencil Buffer 0, // No Auxiliary Buffer PFD_MAIN_PLANE, // Main Drawing Layer 0, // Reserved 0, 0, 0 // Layer Masks Ignored};PAINTSTRUCT OGLWindow::ps;void OGLWindow::InitializeStatics(){ HWND SetupWindow = CreateWindowEx(NULL, WC_DIALOG, NULL, 0, 0, 0, 0, 0, 0, 0, g_hInst, NULL); HDC hDC = GetDC(SetupWindow); pfd.cDepthBits = GetDeviceCaps(hDC, BITSPIXEL); SetPixelFormat(hDC, ChoosePixelFormat(hDC, &pfd), &pfd); wglMakeCurrent(hDC, wglCreateContext(hDC)); /* setup default opengl stuff */ //int c = GetSysColor(COLOR_3DFACE); int c = RGB(255, 255, 255); glClearColor(GetRValue(c) / 255.0f, GetGValue(c) / 255.0f, GetBValue(c) / 255.0f, 0.0f); glShadeModel(GL_SMOOTH); glClearDepth(1.0f); glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LEQUAL); glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); MakeCurrent(NULL); ReleaseDC(SetupWindow, hDC); DestroyWindow(SetupWindow);}void OGLWindow::SetupWindowForOGL(HWND hWnd){ HDC hDC = GetDC(hWnd); SetPixelFormat(hDC, ChoosePixelFormat(hDC, &pfd), &pfd); ReleaseDC(hWnd, hDC);}void OGLWindow::DeInitializeStatics(){ wglDeleteContext(wglGetCurrentContext());}void OGLWindow::StartRender(HWND hWnd, boolean defaultsettings){ RECT rc; GetClientRect(hWnd, &rc); MakeCurrent(BeginPaint(hWnd, &ps)); glViewport(0, 0, rc.right, rc.bottom); glPushAttrib(GL_ALL_ATTRIB_BITS); if(defaultsettings) { glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(90.0f, (GLfloat)rc.right /(GLfloat)rc.bottom, 0.1f, 128.0f); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); }}void OGLWindow::EndRender(){ HDC hDC = wglGetCurrentDC(); HWND hWnd = WindowFromDC(hDC); SwapBuffers(hDC); EndPaint(hWnd, &ps); glPopAttrib(); MakeCurrent(NULL);}BTW - please excuse the poor style(this is 2 years old and I don't code like that anymore)but it's tested and it works.
sample usage:
main(){ OGLWindow::InitializeStatics(); MainLoop(); OGLWindow::DeInitializeStatics();}int MdiChildProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam){ switch(msg) { case WM_CREATE: OGLWindow::SetupWindowForOGL(hWnd); break; case WM_PAINT: OGLWindow::StartRender(hWnd); // draw stuff OGLWindow::EndRender(); } return DefMDIChildProc(hWnd, Msg, wParam, lParam);}HTH.
-Melekor
Author
Congratulations Melekor: you are now my new best friend. :D :D
Seriously, thanks a lot. It has helped me get rid of a lot of unweildy code. :D
Seriously, thanks a lot. It has helped me get rid of a lot of unweildy code. :D
This topic is closed to new replies.
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