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358
DependentExtensions/DXTCompressor/Src/OpenGLWindow.hpp
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358
DependentExtensions/DXTCompressor/Src/OpenGLWindow.hpp
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/*
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* This Code Was Created By Jeff Molofee 2000
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* A HUGE Thanks To Fredric Echols For Cleaning Up
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* And Optimizing This Code, Making It More Flexible!
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* If You've Found This Code Useful, Please Let Me Know.
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* Visit My Site At nehe.gamedev.net
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*/
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/*
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* This file was taken from RakNet 4.082.
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* Please see licenses/RakNet license.txt for the underlying license and related copyright.
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*
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* Modified work: Copyright (c) 2015-2020, SLikeSoft UG (haftungsbeschr<68>nkt)
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*
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* This source code was modified by SLikeSoft. Modifications are licensed under the MIT-style
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* license found in the license.txt file in the root directory of this source tree.
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*/
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#include <windows.h> // Header File For Windows
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#include <tchar.h> // Header File For Unicode conversion support
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#include <gl\gl.h> // Header File For The OpenGL32 Library
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#include <gl\glu.h> // Header File For The GLu32 Library
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HDC hDC= nullptr; // Private GDI Device Context
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HGLRC hRC= nullptr; // Permanent Rendering Context
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HWND hWnd= nullptr; // Holds Our Window Handle
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HINSTANCE hInstance; // Holds The Instance Of The Application
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int windowWidth = 0, windowHeight = 0;
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bool keys[256]; // Array Used For The Keyboard Routine
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bool active=TRUE; // Window Active Flag Set To TRUE By Default
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bool fullscreen=TRUE; // Fullscreen Flag Set To Fullscreen Mode By Default
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static void MessageBoxPrivate( HWND hWnd, const char* pMessage, const char* pTitle, int flags )
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{
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printf( "%s: %s\n", pTitle, pMessage );
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}
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LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); // Declaration For WndProc
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GLvoid ReSizeGLScene(GLsizei width, GLsizei height) // Resize And Initialize The GL Window
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{
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if (height==0) // Prevent A Divide By Zero By
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{
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height=1; // Making Height Equal One
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}
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glViewport(0,0,width,height); // Reset The Current Viewport
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glMatrixMode(GL_PROJECTION); // Select The Projection Matrix
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glLoadIdentity(); // Reset The Projection Matrix
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// Calculate The Aspect Ratio Of The Window
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gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f);
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glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix
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glLoadIdentity(); // Reset The Modelview Matrix
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}
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int InitGL(GLvoid) // All Setup For OpenGL Goes Here
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{
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glShadeModel(GL_SMOOTH); // Enable Smooth Shading
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glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background
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glClearDepth(1.0f); // Depth Buffer Setup
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glEnable(GL_DEPTH_TEST); // Enables Depth Testing
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glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do
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glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // Really Nice Perspective Calculations
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return TRUE; // Initialization Went OK
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}
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int DrawGLScene(GLvoid) // Here's Where We Do All The Drawing
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
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glLoadIdentity(); // Reset The Current Modelview Matrix
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return TRUE; // Everything Went OK
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}
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GLvoid KillGLWindow(GLvoid) // Properly Kill The Window
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{
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if (fullscreen) // Are We In Fullscreen Mode?
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{
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ChangeDisplaySettings(nullptr,0); // If So Switch Back To The Desktop
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ShowCursor(TRUE); // Show Mouse Pointer
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}
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if (hRC) // Do We Have A Rendering Context?
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{
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if (!wglMakeCurrent(nullptr, nullptr)) // Are We Able To Release The DC And RC Contexts?
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{
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MessageBoxPrivate(nullptr,"Release Of DC And RC Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
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}
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if (!wglDeleteContext(hRC)) // Are We Able To Delete The RC?
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{
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MessageBoxPrivate(nullptr,"Release Rendering Context Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
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}
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hRC= nullptr; // Set RC To nullptr
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}
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if (hDC && !ReleaseDC(hWnd,hDC)) // Are We Able To Release The DC
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{
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MessageBoxPrivate(nullptr,"Release Device Context Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
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hDC= nullptr; // Set DC To nullptr
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}
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if (hWnd && !DestroyWindow(hWnd)) // Are We Able To Destroy The Window?
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{
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MessageBoxPrivate(nullptr,"Could Not Release hWnd.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
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hWnd= nullptr; // Set hWnd To nullptr
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}
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if (!UnregisterClass(_T("OpenGL"),hInstance)) // Are We Able To Unregister Class
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{
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MessageBoxPrivate(nullptr,"Could Not Unregister Class.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
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hInstance= nullptr; // Set hInstance To nullptr
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}
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}
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/* This Code Creates Our OpenGL Window. Parameters Are: *
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* title - Title To Appear At The Top Of The Window *
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* width - Width Of The GL Window Or Fullscreen Mode *
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* height - Height Of The GL Window Or Fullscreen Mode *
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* bits - Number Of Bits To Use For Color (8/16/24/32) *
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* fullscreenflag - Use Fullscreen Mode (TRUE) Or Windowed Mode (FALSE) */
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BOOL CreateGLWindow(char* title, int width, int height, int bits, bool fullscreenflag, bool hideWindow=true)
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{
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GLuint PixelFormat; // Holds The Results After Searching For A Match
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WNDCLASS wc; // Windows Class Structure
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DWORD dwExStyle; // Window Extended Style
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DWORD dwStyle; // Window Style
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RECT WindowRect; // Grabs Rectangle Upper Left / Lower Right Values
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WindowRect.left=(long)0; // Set Left Value To 0
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WindowRect.right=(long)width; // Set Right Value To Requested Width
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WindowRect.top=(long)0; // Set Top Value To 0
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WindowRect.bottom=(long)height; // Set Bottom Value To Requested Height
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fullscreen=fullscreenflag; // Set The Global Fullscreen Flag
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hInstance = GetModuleHandle(nullptr); // Grab An Instance For Our Window
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wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; // Redraw On Size, And Own DC For Window.
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wc.lpfnWndProc = (WNDPROC) WndProc; // WndProc Handles Messages
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wc.cbClsExtra = 0; // No Extra Window Data
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wc.cbWndExtra = 0; // No Extra Window Data
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wc.hInstance = hInstance; // Set The Instance
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wc.hIcon = LoadIcon(nullptr, IDI_WINLOGO); // Load The Default Icon
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wc.hCursor = LoadCursor(nullptr, IDC_ARROW); // Load The Arrow Pointer
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wc.hbrBackground = nullptr; // No Background Required For GL
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wc.lpszMenuName = nullptr; // We Don't Want A Menu
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wc.lpszClassName = _T("OpenGL"); // Set The Class Name
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if (!RegisterClass(&wc)) // Attempt To Register The Window Class
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{
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MessageBoxPrivate(nullptr,"Failed To Register The Window Class.","ERROR",MB_OK|MB_ICONEXCLAMATION);
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return FALSE; // Return FALSE
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}
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if (fullscreen) // Attempt Fullscreen Mode?
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{
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DEVMODE dmScreenSettings; // Device Mode
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memset(&dmScreenSettings,0,sizeof(dmScreenSettings)); // Makes Sure Memory's Cleared
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dmScreenSettings.dmSize=sizeof(dmScreenSettings); // Size Of The Devmode Structure
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dmScreenSettings.dmPelsWidth = width; // Selected Screen Width
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dmScreenSettings.dmPelsHeight = height; // Selected Screen Height
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dmScreenSettings.dmBitsPerPel = bits; // Selected Bits Per Pixel
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dmScreenSettings.dmFields=DM_BITSPERPEL|DM_PELSWIDTH|DM_PELSHEIGHT;
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// Try To Set Selected Mode And Get Results. NOTE: CDS_FULLSCREEN Gets Rid Of Start Bar.
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if (ChangeDisplaySettings(&dmScreenSettings,CDS_FULLSCREEN)!=DISP_CHANGE_SUCCESSFUL)
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{
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/*
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// If The Mode Fails, Offer Two Options. Quit Or Use Windowed Mode.
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if (MessageBoxPrivate(nullptr,"The Requested Fullscreen Mode Is Not Supported By\nYour Video Card. Use Windowed Mode Instead?","NeHe GL",MB_YESNO|MB_ICONEXCLAMATION)==IDYES)
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{
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fullscreen=FALSE; // Windowed Mode Selected. Fullscreen = FALSE
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}
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else
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{
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// Pop Up A Message Box Letting User Know The Program Is Closing.
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MessageBoxPrivate(nullptr,"Program Will Now Close.","ERROR",MB_OK|MB_ICONSTOP);
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return FALSE; // Return FALSE
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}
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*/
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fullscreen=FALSE;
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}
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}
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if (fullscreen) // Are We Still In Fullscreen Mode?
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{
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dwExStyle=WS_EX_APPWINDOW; // Window Extended Style
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dwStyle=WS_POPUP; // Windows Style
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ShowCursor(FALSE); // Hide Mouse Pointer
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}
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else
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{
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dwExStyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE; // Window Extended Style
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dwStyle=WS_OVERLAPPEDWINDOW; // Windows Style
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}
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AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle); // Adjust Window To True Requested Size
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// Create The Window
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if (!(hWnd=CreateWindowEx( dwExStyle, // Extended Style For The Window
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_T("OpenGL"), // Class Name
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_T("DXTCompress"), // Window Title
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dwStyle | // Defined Window Style
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WS_CLIPSIBLINGS | // Required Window Style
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WS_CLIPCHILDREN, // Required Window Style
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0, 0, // Window Position
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WindowRect.right-WindowRect.left, // Calculate Window Width
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WindowRect.bottom-WindowRect.top, // Calculate Window Height
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nullptr, // No Parent Window
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nullptr, // No Menu
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hInstance, // Instance
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nullptr))) // Dont Pass Anything To WM_CREATE
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{
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KillGLWindow(); // Reset The Display
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MessageBoxPrivate(nullptr,"Window Creation Error.","ERROR",MB_OK|MB_ICONEXCLAMATION);
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return FALSE; // Return FALSE
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}
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static PIXELFORMATDESCRIPTOR pfd= // pfd Tells Windows How We Want Things To Be
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{
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sizeof(PIXELFORMATDESCRIPTOR), // Size Of This Pixel Format Descriptor
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1, // Version Number
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PFD_DRAW_TO_WINDOW | // Format Must Support Window
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PFD_SUPPORT_OPENGL | // Format Must Support OpenGL
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PFD_DOUBLEBUFFER, // Must Support Double Buffering
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PFD_TYPE_RGBA, // Request An RGBA Format
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static_cast<BYTE>(bits), // Select Our Color Depth
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0, 0, 0, 0, 0, 0, // Color Bits Ignored
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0, // No Alpha Buffer
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0, // Shift Bit Ignored
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0, // No Accumulation Buffer
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0, 0, 0, 0, // Accumulation Bits Ignored
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16, // 16Bit Z-Buffer (Depth Buffer)
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0, // No Stencil Buffer
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0, // No Auxiliary Buffer
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PFD_MAIN_PLANE, // Main Drawing Layer
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0, // Reserved
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0, 0, 0 // Layer Masks Ignored
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};
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if (!(hDC=GetDC(hWnd))) // Did We Get A Device Context?
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{
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KillGLWindow(); // Reset The Display
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MessageBoxPrivate(nullptr,"Can't Create A GL Device Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
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return FALSE; // Return FALSE
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}
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if (!(PixelFormat=ChoosePixelFormat(hDC,&pfd))) // Did Windows Find A Matching Pixel Format?
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{
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KillGLWindow(); // Reset The Display
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MessageBoxPrivate(nullptr,"Can't Find A Suitable PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);
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return FALSE; // Return FALSE
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}
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if(!SetPixelFormat(hDC,PixelFormat,&pfd)) // Are We Able To Set The Pixel Format?
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{
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KillGLWindow(); // Reset The Display
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MessageBoxPrivate(nullptr,"Can't Set The PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);
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return FALSE; // Return FALSE
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}
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if (!(hRC=wglCreateContext(hDC))) // Are We Able To Get A Rendering Context?
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{
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KillGLWindow(); // Reset The Display
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MessageBoxPrivate(nullptr,"Can't Create A GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
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return FALSE; // Return FALSE
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}
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if(!wglMakeCurrent(hDC,hRC)) // Try To Activate The Rendering Context
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{
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KillGLWindow(); // Reset The Display
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MessageBoxPrivate(nullptr,"Can't Activate The GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
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return FALSE; // Return FALSE
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}
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if( hideWindow )
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ShowWindow(hWnd,SW_HIDE); // Show The Window
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else
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ShowWindow(hWnd,SW_SHOW); // Show The Window
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SetForegroundWindow(hWnd); // Slightly Higher Priority
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SetFocus(hWnd); // Sets Keyboard Focus To The Window
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ReSizeGLScene(width, height); // Set Up Our Perspective GL Screen
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if (!InitGL()) // Initialize Our Newly Created GL Window
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{
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KillGLWindow(); // Reset The Display
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MessageBoxPrivate(nullptr,"Initialization Failed.","ERROR",MB_OK|MB_ICONEXCLAMATION);
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return FALSE; // Return FALSE
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}
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return TRUE; // Success
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}
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LRESULT CALLBACK WndProc( HWND hWnd, // Handle For This Window
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UINT uMsg, // Message For This Window
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WPARAM wParam, // Additional Message Information
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LPARAM lParam) // Additional Message Information
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{
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switch (uMsg) // Check For Windows Messages
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{
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case WM_ACTIVATE: // Watch For Window Activate Message
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{
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if (!HIWORD(wParam)) // Check Minimization State
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{
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active=TRUE; // Program Is Active
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}
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else
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{
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active=FALSE; // Program Is No Longer Active
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}
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return 0; // Return To The Message Loop
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}
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case WM_SYSCOMMAND: // Intercept System Commands
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{
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switch (wParam) // Check System Calls
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{
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case SC_SCREENSAVE: // Screensaver Trying To Start?
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case SC_MONITORPOWER: // Monitor Trying To Enter Powersave?
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return 0; // Prevent From Happening
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}
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break; // Exit
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}
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case WM_CLOSE: // Did We Receive A Close Message?
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{
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PostQuitMessage(0); // Send A Quit Message
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return 0; // Jump Back
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}
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case WM_KEYDOWN: // Is A Key Being Held Down?
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{
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keys[wParam] = TRUE; // If So, Mark It As TRUE
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return 0; // Jump Back
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}
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case WM_KEYUP: // Has A Key Been Released?
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{
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keys[wParam] = FALSE; // If So, Mark It As FALSE
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return 0; // Jump Back
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}
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case WM_SIZE: // Resize The OpenGL Window
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{
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windowWidth = LOWORD(lParam);
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windowHeight = HIWORD(lParam);
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ReSizeGLScene(windowWidth, windowHeight); // LoWord=Width, HiWord=Height
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return 0; // Jump Back
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}
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}
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// Pass All Unhandled Messages To DefWindowProc
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return DefWindowProc(hWnd,uMsg,wParam,lParam);
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}
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