📄 lesson21.cpp
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glEnd(); // Done Drawing Horizontal Cell Borders
}
glColor3f(0.0f,0.5f,1.0f); // Set Line Color To Blue
if (vline[loop1][loop2]) // Has The Horizontal Line Been Traced
{
glColor3f(1.0f,1.0f,1.0f); // If So, Set Line Color To White
}
if (loop2<10) // Dont Draw To Far Down
{
if (!vline[loop1][loop2]) // If A Verticle Line Isn't Filled
{
filled=FALSE; // filled Becomes False
}
glBegin(GL_LINES); // Start Drawing Verticle Cell Borders
glVertex2d(20+(loop1*60),70+(loop2*40));// Left Side Of Horizontal Line
glVertex2d(20+(loop1*60),110+(loop2*40));// Right Side Of Horizontal Line
glEnd(); // Done Drawing Verticle Cell Borders
}
glEnable(GL_TEXTURE_2D); // Enable Texture Mapping
glColor3f(1.0f,1.0f,1.0f); // Bright White Color
glBindTexture(GL_TEXTURE_2D, texture[1]); // Select The Tile Image
if ((loop1<10) && (loop2<10)) // If In Bounds, Fill In Traced Boxes
{
// Are All Sides Of The Box Traced?
if (hline[loop1][loop2] && hline[loop1][loop2+1] && vline[loop1][loop2] && vline[loop1+1][loop2])
{
glBegin(GL_QUADS); // Draw A Textured Quad
glTexCoord2f(float(loop1/10.0f)+0.1f,1.0f-(float(loop2/10.0f)));
glVertex2d(20+(loop1*60)+59,(70+loop2*40+1)); // Top Right
glTexCoord2f(float(loop1/10.0f),1.0f-(float(loop2/10.0f)));
glVertex2d(20+(loop1*60)+1,(70+loop2*40+1)); // Top Left
glTexCoord2f(float(loop1/10.0f),1.0f-(float(loop2/10.0f)+0.1f));
glVertex2d(20+(loop1*60)+1,(70+loop2*40)+39); // Bottom Left
glTexCoord2f(float(loop1/10.0f)+0.1f,1.0f-(float(loop2/10.0f)+0.1f));
glVertex2d(20+(loop1*60)+59,(70+loop2*40)+39); // Bottom Right
glEnd(); // Done Texturing The Box
}
}
glDisable(GL_TEXTURE_2D); // Disable Texture Mapping
}
}
glLineWidth(1.0f); // Set The Line Width To 1.0f
if (anti) // Is Anti TRUE?
{
glEnable(GL_LINE_SMOOTH); // If So, Enable Antialiasing
}
if (hourglass.fx==1) // If fx=1 Draw The Hourglass
{
glLoadIdentity(); // Reset The Modelview Matrix
glTranslatef(20.0f+(hourglass.x*60),70.0f+(hourglass.y*40),0.0f); // Move To The Fine Hourglass Position
glRotatef(hourglass.spin,0.0f,0.0f,1.0f); // Rotate Clockwise
glColor3ub(rand()%255,rand()%255,rand()%255); // Set Hourglass Color To Random Color
glBegin(GL_LINES); // Start Drawing Our Hourglass Using Lines
glVertex2d(-5,-5); // Top Left Of Hourglass
glVertex2d( 5, 5); // Bottom Right Of Hourglass
glVertex2d( 5,-5); // Top Right Of Hourglass
glVertex2d(-5, 5); // Bottom Left Of Hourglass
glVertex2d(-5, 5); // Bottom Left Of Hourglass
glVertex2d( 5, 5); // Bottom Right Of Hourglass
glVertex2d(-5,-5); // Top Left Of Hourglass
glVertex2d( 5,-5); // Top Right Of Hourglass
glEnd(); // Done Drawing The Hourglass
}
glLoadIdentity(); // Reset The Modelview Matrix
glTranslatef(player.fx+20.0f,player.fy+70.0f,0.0f); // Move To The Fine Player Position
glRotatef(player.spin,0.0f,0.0f,1.0f); // Rotate Clockwise
glColor3f(0.0f,1.0f,0.0f); // Set Player Color To Light Green
glBegin(GL_LINES); // Start Drawing Our Player Using Lines
glVertex2d(-5,-5); // Top Left Of Player
glVertex2d( 5, 5); // Bottom Right Of Player
glVertex2d( 5,-5); // Top Right Of Player
glVertex2d(-5, 5); // Bottom Left Of Player
glEnd(); // Done Drawing The Player
glRotatef(player.spin*0.5f,0.0f,0.0f,1.0f); // Rotate Clockwise
glColor3f(0.0f,0.75f,0.0f); // Set Player Color To Dark Green
glBegin(GL_LINES); // Start Drawing Our Player Using Lines
glVertex2d(-7, 0); // Left Center Of Player
glVertex2d( 7, 0); // Right Center Of Player
glVertex2d( 0,-7); // Top Center Of Player
glVertex2d( 0, 7); // Bottom Center Of Player
glEnd(); // Done Drawing The Player
for (loop1=0; loop1<(stage*level); loop1++) // Loop To Draw Enemies
{
glLoadIdentity(); // Reset The Modelview Matrix
glTranslatef(enemy[loop1].fx+20.0f,enemy[loop1].fy+70.0f,0.0f);
glColor3f(1.0f,0.5f,0.5f); // Make Enemy Body Pink
glBegin(GL_LINES); // Start Drawing Enemy
glVertex2d( 0,-7); // Top Point Of Body
glVertex2d(-7, 0); // Left Point Of Body
glVertex2d(-7, 0); // Left Point Of Body
glVertex2d( 0, 7); // Bottom Point Of Body
glVertex2d( 0, 7); // Bottom Point Of Body
glVertex2d( 7, 0); // Right Point Of Body
glVertex2d( 7, 0); // Right Point Of Body
glVertex2d( 0,-7); // Top Point Of Body
glEnd(); // Done Drawing Enemy Body
glRotatef(enemy[loop1].spin,0.0f,0.0f,1.0f); // Rotate The Enemy Blade
glColor3f(1.0f,0.0f,0.0f); // Make Enemy Blade Red
glBegin(GL_LINES); // Start Drawing Enemy Blade
glVertex2d(-7,-7); // Top Left Of Enemy
glVertex2d( 7, 7); // Bottom Right Of Enemy
glVertex2d(-7, 7); // Bottom Left Of Enemy
glVertex2d( 7,-7); // Top Right Of Enemy
glEnd(); // Done Drawing Enemy Blade
}
return TRUE; // Everything Went OK
}
GLvoid KillGLWindow(GLvoid) // Properly Kill The Window
{
if (fullscreen) // Are We In Fullscreen Mode?
{
ChangeDisplaySettings(NULL,0); // If So Switch Back To The Desktop
ShowCursor(TRUE); // Show Mouse Pointer
}
if (hRC) // Do We Have A Rendering Context?
{
if (!wglMakeCurrent(NULL,NULL)) // Are We Able To Release The DC And RC Contexts?
{
MessageBox(NULL,"Release Of DC And RC Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
}
if (!wglDeleteContext(hRC)) // Are We Able To Delete The RC?
{
MessageBox(NULL,"Release Rendering Context Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
}
hRC=NULL; // Set RC To NULL
}
if (hDC && !ReleaseDC(hWnd,hDC)) // Are We Able To Release The DC
{
MessageBox(NULL,"Release Device Context Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
hDC=NULL; // Set DC To NULL
}
if (hWnd && !DestroyWindow(hWnd)) // Are We Able To Destroy The Window?
{
MessageBox(NULL,"Could Not Release hWnd.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
hWnd=NULL; // Set hWnd To NULL
}
if (!UnregisterClass("OpenGL",hInstance)) // Are We Able To Unregister Class
{
MessageBox(NULL,"Could Not Unregister Class.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
hInstance=NULL; // Set hInstance To NULL
}
KillFont(); // Kill The Font We Built
}
/* This Code Creates Our OpenGL Window. Parameters Are: *
* title - Title To Appear At The Top Of The Window *
* width - Width Of The GL Window Or Fullscreen Mode *
* height - Height Of The GL Window Or Fullscreen Mode *
* bits - Number Of Bits To Use For Color (8/16/24/32) *
* fullscreenflag - Use Fullscreen Mode (TRUE) Or Windowed Mode (FALSE) */
BOOL CreateGLWindow(char* title, int width, int height, int bits, bool fullscreenflag)
{
GLuint PixelFormat; // Holds The Results After Searching For A Match
WNDCLASS wc; // Windows Class Structure
DWORD dwExStyle; // Window Extended Style
DWORD dwStyle; // Window Style
RECT WindowRect; // Grabs Rectangle Upper Left / Lower Right Values
WindowRect.left=(long)0; // Set Left Value To 0
WindowRect.right=(long)width; // Set Right Value To Requested Width
WindowRect.top=(long)0; // Set Top Value To 0
WindowRect.bottom=(long)height; // Set Bottom Value To Requested Height
fullscreen=fullscreenflag; // Set The Global Fullscreen Flag
hInstance = GetModuleHandle(NULL); // Grab An Instance For Our Window
wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; // Redraw On Size, And Own DC For Window
wc.lpfnWndProc = (WNDPROC) WndProc; // WndProc Handles Messages
wc.cbClsExtra = 0; // No Extra Window Data
wc.cbWndExtra = 0; // No Extra Window Data
wc.hInstance = hInstance; // Set The Instance
wc.hIcon = LoadIcon(NULL, IDI_WINLOGO); // Load The Default Icon
wc.hCursor = LoadCursor(NULL, IDC_ARROW); // Load The Arrow Pointer
wc.hbrBackground = NULL; // No Background Required For GL
wc.lpszMenuName = NULL; // We Don't Want A Menu
wc.lpszClassName = "OpenGL"; // Set The Class Name
if (!RegisterClass(&wc)) // Attempt To Register The Window Class
{
MessageBox(NULL,"Failed To Register The Window Class.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return FALSE; // Return FALSE
}
if (fullscreen) // Attempt Fullscreen Mode?
{
DEVMODE dmScreenSettings; // Device Mode
memset(&dmScreenSettings,0,sizeof(dmScreenSettings)); // Makes Sure Memory's Cleared
dmScreenSettings.dmSize=sizeof(dmScreenSettings); // Size Of The Devmode Structure
dmScreenSettings.dmPelsWidth = width; // Selected Screen Width
dmScreenSettings.dmPelsHeight = height; // Selected Screen Height
dmScreenSettings.dmBitsPerPel = bits; // Selected Bits Per Pixel
dmScreenSettings.dmFields=DM_BITSPERPEL|DM_PELSWIDTH|DM_PELSHEIGHT;
// Try To Set Selected Mode And Get Results. NOTE: CDS_FULLSCREEN Gets Rid Of Start Bar.
if (ChangeDisplaySettings(&dmScreenSettings,CDS_FULLSCREEN)!=DISP_CHANGE_SUCCESSFUL)
{
// If The Mode Fails, Offer Two Options. Quit Or Use Windowed Mode.
if (MessageBox(NULL,"The Requested Fullscreen Mode Is Not Supported By\nYour Video Card. Use Windowed Mode Instead?","NeHe GL",MB_YESNO|MB_ICONEXCLAMATION)==IDYES)
{
fullscreen=FALSE; // Windowed Mode Selected. Fullscreen = FALSE
}
else
{
// Pop Up A Message Box Letting User Know The Program Is Closing.
MessageBox(NULL,"Program Will Now Close.","ERROR",MB_OK|MB_ICONSTOP);
return FALSE; // Return FALSE
}
}
}
if (fullscreen) // Are We Still In Fullscreen Mode?
{
dwExStyle=WS_EX_APPWINDOW; // Window Extended Style
dwStyle=WS_POPUP; // Windows Style
ShowCursor(FALSE); // Hide Mouse Pointer
}
else
{
dwExStyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE; // Window Extended Style
dwStyle=WS_OVERLAPPEDWINDOW; // Windows Style
}
AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle); // Adjust Window To True Requested Size
// Create The Window
if (!(hWnd=CreateWindowEx( dwExStyle, // Extended Style For The Window
"OpenGL", // Class Name
title, // Window Title
dwStyle | // Defined Window Style
WS_CLIPSIBLINGS | // Required Window Style
WS_CLIPCHILDREN, // Required Window Style
0, 0, // Window Position
WindowRect.right-WindowRect.left, // Calculate Window Width
WindowRect.bottom-WindowRect.top, // Calculate Window Height
NULL, // No Parent Window
NULL, // No Menu
hInstance, // Instance
NULL))) // Dont Pass Anything To WM_CREATE
{
KillGLWindow(); // Reset The Display
MessageBox(NULL,"Window Creation Error.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return FALSE; // Return FALSE
}
static PIXELFORMATDESCRIPTOR pfd= // pfd Tells Windows How We Want Things To Be
{
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, // 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 Buffer
0, 0, 0, 0, // Accumulation Bits Ignored
16, // 16Bit 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
};
if (!(hDC=GetDC(hWnd))) // Did We Get A Device Context?
{
KillGLWindow(); // Reset The Display
MessageBox(NULL,"Can't Create A GL Device Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return FALSE; // Return FALSE
}
if (!(PixelFormat=ChoosePixelFormat(hDC,&pfd))) // Did Windows Find A Matching Pixel Format?
{
KillGLWindow(); // Reset The Display
MessageBox(NULL,"Can't Find A Suitable PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return FALSE; // Return FALSE
}
if(!SetPixelFormat(hDC,PixelFormat,&pfd)) // Are We Able To Set The Pixel Format?
{
KillGLWindow(); // Reset The Display
MessageBox(NULL,"Can't Set The PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return FALSE; // Return FALSE
}
if (!(hRC=wglCreateContext(hDC))) // Are We Able To Get A Rendering Context?
{
KillGLWindow(); // Reset The Display
MessageBox(NULL,"Can't Create A GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return FALSE; // Return FALSE
}
if(!wglMakeCurrent(hDC,hRC)) // Try To Activate The Rendering Context
{
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
if (!InitGL()) // Initialize Our Newly Created GL Window
{
KillGLWindow(); // Reset The Display
MessageBox(NULL,"Initialization Failed.","ERROR",MB_OK|MB_ICONEXCLAMATION);
return FALSE; // Return FALSE
}
return TRUE; // Success
}
LRESULT CALLBACK WndProc( HWND hWnd, // Handle For This Window
UINT uMsg, // Message For This Window
WPARAM wParam, // Additional Message Information
LPARAM lParam) // Additional Message Information
{
switch (uMsg) // Check For Windows Messages
{
case WM_ACTIVATE: // Watch For Window Activate Message
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