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I was trying to create a basic window with opengl and win32 application in visual studio 2013.
Everything works fine except the window title and messages in messagebox are not showing English. My code is given below:
#include "stdafx.h"
#include "ThesisProject.h"
#define MAX_LOADSTRING 100
// ================================= Variable Region : All the global variables will be declared here with categorization =========================== //
TCHAR szTitle[MAX_LOADSTRING];
TCHAR szWindowClass[MAX_LOADSTRING];
HDC hDC = NULL; // Private GDI Device Context. GDI : http://en.wikipedia.org/wiki/Graphics_Device_Interface
HWND hWnd = NULL; // holds our window handle.
HINSTANCE hInstance; // holds the instance of the application
HGLRC hRC = NULL; // Permanent Rendering Context
bool keys[256]; // Array Used for the keyboard routine. this will help us to track multiple key press, like : "Ctrl + s"
bool active = TRUE; // window active flag. set to true by default.
bool fullscreen = TRUE; // fullscreen flag. set to true by default. indicates whether the screen should be windowed or fullscreen.
// ================================================================================================================================================== //
// ================================ Function prototype declaration region : all the function prototype declaration will go here. ====================== //
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); // a call back function to process window action.
int InitGL(GLvoid); // this function is used for setting up opengl components.
BOOL CreateGLWindow(char* title, int width, int height, int bits, bool fullscreenflag); // creates the window.
int DrawGLScene(GLvoid); // this is where all the drawing goes.
GLvoid ReSizeGLScene(GLsizei width, GLsizei height); // this function is used to handle the properties when the window is resized when full screen mode is not used.
GLvoid KillGLWindow(GLvoid); // this function is called before closing the window.
// =================================================================================================================================================== //
// this function is the entry point of this project . what ever this program does, it starts from here.
int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPTSTR lpCmdLine,
_In_ int nCmdShow)
{
MSG msg; // Windows Message Structure
BOOL done = FALSE; // Bool Variable To Exit Loop
// Create Our OpenGL Window
if (!CreateGLWindow("OpenGL Testing", 640, 480, 16, fullscreen))
{
return 0; // Quit If Window Was Not Created
}
while (!done) // Loop That Runs Until done=TRUE
{
if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) // Is There A Message Waiting?
{
if (msg.message == WM_QUIT) // Have We Received A Quit Message?
{
done = TRUE; // If So done=TRUE
}
else // If Not, Deal With Window Messages
{
TranslateMessage(&msg); // Translate The Message
DispatchMessage(&msg); // Dispatch The Message
}
}
else // If There Are No Messages
{
// Draw The Scene. Watch For ESC Key And Quit Messages From DrawGLScene()
if (active) // Program Active?
{
if (keys[VK_ESCAPE]) // Was ESC Pressed?
{
done = TRUE; // ESC Signalled A Quit
}
else // Not Time To Quit, Update Screen
{
DrawGLScene(); // Draw The Scene
SwapBuffers(hDC); // Swap Buffers (Double Buffering)
}
}
if (keys[VK_F1]) // Is F1 Being Pressed?
{
keys[VK_F1] = FALSE; // If So Make Key FALSE
KillGLWindow(); // Kill Our Current Window
fullscreen = !fullscreen; // Toggle Fullscreen / Windowed Mode
// Recreate Our OpenGL Window
if (!CreateGLWindow("Aqib", 640, 480, 16, fullscreen))
{
return 0; // Quit If Window Was Not Created
}
}
}
}
// Shutdown
KillGLWindow(); // Kill The Window
return (msg.wParam); // Exit The Program
}
// this function is used to initialize all the opengl components.
int InitGL(GLvoid){
glShadeModel(GL_SMOOTH); // enabling smooth shader
glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // black background
glClearDepth(1.0f); // depth buffer setup
glEnable(GL_DEPTH_TEST); // enable depth testing
glDepthFunc(GL_LEQUAL); // the type of depth test to do
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // really nice perspective calculations
return TRUE; // initialization went ok
}
// this function creates and registers the window to the OS.
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 Move, 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 = (LPCWSTR)"OpenGLTesting"; // Set The Class Name
if (!RegisterClass(&wc)) // Attempt To Register The Window Class
{
MessageBox(NULL, (LPCWSTR)"Failed To Register The Window Class.", (LPCWSTR)"ERROR", MB_OK | MB_ICONEXCLAMATION);
return FALSE; // Exit And 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 Run In A Window.
fullscreen = FALSE;
}
}
if (fullscreen){ // Are We Still In Fullscreen Mode?
dwExStyle = WS_EX_APPWINDOW; // Window Extended Style
dwStyle = WS_POPUP; // Windows Style
ShowCursor(TRUE); // 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
if (!(hWnd = CreateWindowEx(dwExStyle, // Extended Style For The Window
(LPCWSTR)"OpenGLTesting", // Class Name
(LPCWSTR)title, // Window Title
WS_CLIPSIBLINGS | // Required Window Style
WS_CLIPCHILDREN | // Required Window Style
dwStyle, // Selected Window Style
0, 0, // Window Position
WindowRect.right - WindowRect.left, // Calculate Adjusted Window Width
WindowRect.bottom - WindowRect.top, // Calculate Adjusted Window Height
NULL, // No Parent Window
NULL, // No Menu
hInstance, // Instance
NULL)))
{
KillGLWindow(); // Reset The Display
MessageBox(NULL, (LPCWSTR)"Window Creation Error.", (LPCWSTR)"ERROR", MB_OK | MB_ICONEXCLAMATION);
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, (LPCWSTR)"Can't Create A GL Device Context.", (LPCWSTR)"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, (LPCWSTR)"Can't Find A Suitable PixelFormat.", (LPCWSTR)"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, (LPCWSTR)"Can't Set The PixelFormat.", (LPCWSTR)"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, (LPCWSTR)"Can't Create A GL Rendering Context.", (LPCWSTR)"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, (LPCWSTR)"Can't Activate The GL Rendering Context.", (LPCWSTR)"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, (LPCWSTR)"Initialization Failed.", (LPCWSTR)"ERROR", MB_OK | MB_ICONEXCLAMATION);
return FALSE; // Return FALSE
}
return TRUE; // Success
}
// this function is used to draw objects in the scene.
int DrawGLScene(GLvoid){
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
glLoadIdentity(); // Reset The Current Modelview Matrix
glTranslatef(-1.5f, 0.0f, -6.0f); // Move into space 6 units and -1.5 to the left
glColor3f(0.0f, 0.0f, 1.0f);
glBegin(GL_TRIANGLES); // Begin drawing triagle
glColor3f(0.0f, 0.0f, 1.0f);
glVertex3f(0.0f, 1.0f, 0.0f); // Top
glColor3f(0.0f, 1.0f, 0.0f);
glVertex3f(-1.0f, -1.0f, 0.0f); // Bottom Left
glColor3f(1.0f, 0.0f, 0.0f);
glVertex3f(1.0f, -1.0f, 0.0f); // Bottom Right
glEnd(); // Finished Drawing The Triangle
glTranslatef(3.0f, 0.0f, 0.0f); // Move Right 3 Units
glColor3f(1.0f, 0.0f, 0.0f);
glBegin(GL_QUADS); // Draw A Quad
glColor3f(1.0f, 1.0f, 0.0f);
glVertex3f(-1.0f, 1.0f, 0.0f); // Top Left
glColor3f(0.0f, 1.0f, 1.0f);
glVertex3f(1.0f, 1.0f, 0.0f); // Top Right
glColor3f(1.0f, 0.0f, 1.0f);
glVertex3f(1.0f, -1.0f, 0.0f); // Bottom Right
glColor3f(1.0f, 1.0f, 1.0f);
glVertex3f(-1.0f, -1.0f, 0.0f); // Bottom Left
glEnd(); // Done Drawing The Quad
return TRUE; // Everything Went OK
}
// this function resizes and reinitializes the property of the opengl window when window is resized.
GLvoid ReSizeGLScene(GLsizei width, GLsizei height){
if (height == 0){ // prevent a divide by zero
height = 1; // Making height equal one
}
glViewport(0, 0, width, height); // Resize the current viewport
glMatrixMode(GL_PROJECTION); // select the projection matrix
glLoadIdentity(); // reset the projection matrix
// Calculate theaspect ratio of the window
gluPerspective(45.0f, (GLfloat)width / (GLfloat)height, 0.1f, 100.0f);
glMatrixMode(GL_MODELVIEW); // select the model view matrix
glLoadIdentity(); // reset the modelview matrix
}
// this function is called before closing the application to properly close the window.
GLvoid KillGLWindow(GLvoid)
{
if (fullscreen)
{
ChangeDisplaySettings(NULL, 0); // If so Switch back to the Desktop.
ShowCursor(TRUE); // Show the mouse pointer.
}
if (hRC)
{
if (!wglMakeCurrent(NULL, NULL))
{
MessageBox(NULL, (LPCWSTR)"Release of DC and RC Failed", (LPCWSTR)"SHUTDOWN ERROR", MB_OK | MB_ICONINFORMATION);
}
if (!wglDeleteContext(hRC)) // Are we able to delete the rendering context?
{
MessageBox(NULL, (LPCWSTR)"Release of Rendering Context Failed", (LPCWSTR)"SHUTDOWN ERROR", MB_OK | MB_ICONINFORMATION);
}
hRC = NULL; // set rendering context to null.
}
if (hDC && !ReleaseDC(hWnd, hDC)) // Are We Able To Release The DC
{
MessageBox(NULL, (LPCWSTR)"Release Device Context Failed.", (LPCWSTR)"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, (LPCWSTR)"Could Not Release hWnd.", (LPCWSTR)"SHUTDOWN ERROR", MB_OK | MB_ICONINFORMATION);
hWnd = NULL; // Set hWnd To NULL
}
if (!UnregisterClass((LPCWSTR)"OpenGL", hInstance)) // Are We Able To Unregister Class
{
MessageBox(NULL, (LPCWSTR)"Could Not Unregister Class.", (LPCWSTR)"SHUTDOWN ERROR", MB_OK | MB_ICONINFORMATION);
hInstance = NULL; // Set hInstance To NULL
}
}
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
{
if (!HIWORD(wParam)) // Check Minimization State
{
active = TRUE; // Program Is Active
}
else
{
active = FALSE; // Program Is No Longer Active
}
return 0; // Return To The Message Loop
}
case WM_SYSCOMMAND: // Intercept System Commands
{
switch (wParam) // Check System Calls
{
case SC_SCREENSAVE: // Screensaver Trying To Start?
case SC_MONITORPOWER: // Monitor Trying To Enter Powersave?
return 0; // Prevent From Happening
}
break; // Exit
}
case WM_CLOSE: // Did We Receive A Close Message?
{
PostQuitMessage(0); // Send A Quit Message
return 0; // Jump Back
}
case WM_KEYDOWN: // Is A Key Being Held Down?
{
keys[wParam] = TRUE; // If So, Mark It As TRUE
return 0; // Jump Back
}
case WM_KEYUP: // Has A Key Been Released?
{
keys[wParam] = FALSE; // If So, Mark It As FALSE
return 0; // Jump Back
}
case WM_SIZE: // Resize The OpenGL Window
{
ReSizeGLScene(LOWORD(lParam), HIWORD(lParam)); // LoWord=Width, HiWord=Height
return 0; // Jump Back
}
}
// Pass All Unhandled Messages To DefWindowProc
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
The problem you're most likely running into is, that the Windows APIs you use expect wide character strings, but the string literals you have in your source code are standard (narrow) characters. So for every 2 consecutive characters in your strings, Windows interprets it as a single wide character; which will very likely end up in some asian script if every two bytes of a wchar are nonzero.
Solution: Use the _TEXT(…) macro to surround your string literals, turning them into wide character strings.
I have a simple red rectangle rendered in a window, and I created an arcball in order to rotate it in any direction. I was following the code from NeHe's Arcball Rotation tutorial.
The problem is that once the rectangle is rendered and the left mouse button is clicked, it spins like a top in the window. The mouse click-drag-stop update happens every time the mouse is moved, which is the reason why it spins that way. I am not able to figure out a way to restrict the rotation only for the duration of the click-drag-stop. How do I restrict the rotation? I have been trying to debug this for about 4-5 days now with no luck.
I added the original Arcball.h and Arcball.cpp files to my project, with one change to to the header file; I simply created a default constructor for the Arcball_t class with this line -
ArcBall_t() {};
The only other changes from the original project are that I threw the Update() function call into my code:
// ==========================================================================================
// function declarations
#define GET_PROC_ADDRESS( str ) wglGetProcAddress( str )
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
void DrawOpenGLScene(HDC hDC);
void Update();
HGLRC SetUpOpenGLContext(HWND hWnd);
// ==========================================================================================
// Trackball declarations
const float PI2 = 2.0*3.1415926535f; // PI Squared
GLUquadricObj *quadratic;
Point2fT MousePt; // NEW: Current Mouse Point
bool isClicked = false; // NEW: Clicking The Mouse?
bool isRClicked = false; // NEW: Clicking The Right Mouse Button?
bool isDragging = false; // NEW: Dragging The Mouse?
Matrix4fT Transform = { 1.0f, 0.0f, 0.0f, 0.0f, // NEW: Final Transform
0.0f, 1.0f, 0.0f, 0.0f,
0.0f, 0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f };
Matrix3fT LastRot = { 1.0f, 0.0f, 0.0f, // NEW: Last Rotation
0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 1.0f };
Matrix3fT ThisRot = { 1.0f, 0.0f, 0.0f, // NEW: This Rotation
0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 1.0f };
// ==========================================================================================
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpszCmdLine, int nCmdShow)
{
static char szClassName[] = "Myclass";
static char szTitle[]="A Simple Win32 API OpenGL Program";
WNDCLASS wc;
MSG msg;
HWND hWnd;
wc.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = (WNDPROC)WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = NULL;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)GetStockObject (BLACK_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = szClassName;
if (!RegisterClass (&wc))
return 0;
hWnd = CreateWindow(szClassName, szTitle,
WS_OVERLAPPEDWINDOW |
// NEED THESE for OpenGL calls to work!
WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
0, 0, 1024, 256,
NULL, NULL, hInstance, NULL);
ArcBall_t ArcBall(1024.0f, 256.0f); // NEW: ArcBall Instance
ShowWindow(hWnd, nCmdShow);
UpdateWindow( hWnd );
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}
return(msg.wParam);
}
// ==========================================================================================
//*******************************************************
// This is the brain of the loop
// Checks for a new key press or mouse movement
// renders when something is detected
//*******************************************************
LRESULT CALLBACK WndProc( HWND hWnd, UINT msg,
WPARAM wParam, LPARAM lParam )
{
HDC hDC;
static HGLRC hRC; // Note this is STATIC!
PAINTSTRUCT ps;
switch (msg)
{
case WM_CREATE:
// Select a pixel format and create a rendering context
hRC = SetUpOpenGLContext(hWnd);
break;
case WM_PAINT:
// Draw the scene
// Get a DC, make RC current & associate it with this DC
hDC = BeginPaint(hWnd, &ps);
wglMakeCurrent(hDC, hRC);
DrawOpenGLScene(hDC); // Draw
// We're done with the RC, so deselect it
wglMakeCurrent(NULL, NULL);
EndPaint(hWnd, &ps);
break;
//*NEW* Mouse based messages for arcball
case WM_LBUTTONUP:
isClicked = false;
break;
case WM_RBUTTONUP:
isRClicked = false;
break;
case WM_LBUTTONDOWN:
isClicked = true;
break;
case WM_RBUTTONDOWN:
isRClicked = true;
break;
case WM_MOUSEMOVE:
MousePt.s.X = (GLfloat)LOWORD(lParam);
MousePt.s.Y = (GLfloat)HIWORD(lParam);
isClicked = (LOWORD(wParam) & MK_LBUTTON) ? true : false;
isRClicked = (LOWORD(wParam) & MK_RBUTTON) ? true : false;
Update();
RedrawWindow(hWnd, NULL, NULL, RDW_INTERNALPAINT);
break;
case WM_DESTROY:
// Clean up and terminate
wglDeleteContext(hRC);
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, msg, wParam, lParam);
}
return (0);
}
// ==========================================================================================
//*******************************************************
// SetUpOpenGL sets the pixel format and a rendering
// context then returns the RC
//*******************************************************
HGLRC SetUpOpenGLContext(HWND hWnd)
{
static PIXELFORMATDESCRIPTOR pfd = {
sizeof (PIXELFORMATDESCRIPTOR), // strcut size
1, // Version number
PFD_DRAW_TO_WINDOW | // Flags, draw to a window,
PFD_SUPPORT_OPENGL | // use OpenGL
PFD_DOUBLEBUFFER, // Use a double buffer
PFD_TYPE_RGBA, // RGBA pixel values
32, // 24-bit color
0, 0, 0, // RGB bits & shift sizes.
0, 0, 0, // Don't care about them
0, 0, // No alpha buffer info
0, 0, 0, 0, 0, // No accumulation buffer
32, // 32-bit depth buffer
8, // No stencil buffer
0, // No auxiliary buffers
PFD_MAIN_PLANE, // Layer type
0, // Reserved (must be 0)
0, // No layer mask
0, // No visible mask
0 // No damage mask
};
int nMyPixelFormatID;
HDC hDC;
HGLRC hRC;
hDC = GetDC(hWnd);
nMyPixelFormatID = ChoosePixelFormat(hDC, &pfd);
SetPixelFormat(hDC, nMyPixelFormatID, &pfd);
hRC = wglCreateContext(hDC);
ReleaseDC(hWnd, hDC);
quadratic=gluNewQuadric(); // Create A Pointer To The Quadric Object
gluQuadricNormals(quadratic, GLU_SMOOTH); // Create Smooth Normals
gluQuadricTexture(quadratic, GL_TRUE); // Create Texture Coords
return hRC;
}
// ==========================================================================================
// simple test code - rectangle/triangle
void DrawOpenGLScene(HDC hDC)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode( GL_MODELVIEW );
glTranslatef(0.0f, 0.0f, 0.0f);
glColor3f(1.0, 0.0, 0.0); // drawing color
glBegin(GL_POLYGON); // define the rectangle
glVertex2f(-0.5,-0.5);
glVertex2f(-0.5,0.5);
glVertex2f(0.5,0.5);
glVertex2f(0.5,-0.5);
glEnd();
glMultMatrixf(Transform.M);
glFlush(); // force execution
SwapBuffers(hDC);
}
// ==========================================================================================
void Update () // Perform Motion Updates Here
{
ArcBall_t ArcBall;
if (isRClicked) // If Right Mouse Clicked, Reset All Rotations
{
Matrix3fSetIdentity(&LastRot); // Reset Rotation
Matrix3fSetIdentity(&ThisRot); // Reset Rotation
Matrix4fSetRotationFromMatrix3f(&Transform, &ThisRot); // Reset Rotation
}
if (!isDragging) // Not Dragging
{
if (isClicked) // First Click
{
isDragging = true; // Prepare For Dragging
LastRot = ThisRot; // Set Last Static Rotation To Last Dynamic One
ArcBall.click(&MousePt); // Update Start Vector And Prepare For Dragging
}
}
else
{
if (isClicked) // Still Clicked, So Still Dragging
{
Quat4fT ThisQuat;
ArcBall.drag(&MousePt, &ThisQuat); // Update End Vector And Get Rotation As Quaternion
Matrix3fSetRotationFromQuat4f(&ThisRot, &ThisQuat); // Convert Quaternion Into Matrix3fT
Matrix3fMulMatrix3f(&ThisRot, &LastRot); // Accumulate Last Rotation Into This One
Matrix4fSetRotationFromMatrix3f(&Transform, &ThisRot); // Set Our Final Transform's Rotation From This One
}
else // No Longer Dragging
isDragging = false;
}
}
EDIT: I fixed the issue with the uncontrollable scene rotation by inserting a check within the case WM_MOUSEMOVE: handler of the WndProc() routine. The check was: if(isClicked == true) { //code }, and that seemed to do the trick. It no longer spins like a top. However, I still do not have fine control over the rotation; it still spins like a top within the click-drag-release duration.
Assuming your arcball.drag and arcball.click functions are correct, the only problem with your code is that you are applying the rotation after you draw and your need to do it before.
Your Code:
glTranslatef(0.0f, 0.0f, 0.0f);
glColor3f(1.0, 0.0, 0.0); // drawing color
glBegin(GL_POLYGON); // define the rectangle
glVertex2f(-0.5,-0.5);
glVertex2f(-0.5,0.5);
glVertex2f(0.5,0.5);
glVertex2f(0.5,-0.5);
glEnd();
glMultMatrixf(Transform.M);
Try changing it to:
glTranslatef(0.0f, 0.0f, 0.0f);
glMultMatrixf(Transform.M);
glColor3f(1.0, 0.0, 0.0); // drawing color
glBegin(GL_POLYGON); // define the rectangle
glVertex2f(-0.5,-0.5);
glVertex2f(-0.5,0.5);
glVertex2f(0.5,0.5);
glVertex2f(0.5,-0.5);
glEnd();
Although, based on the code you have provided, I dont think your image should rotate at all BECAUSE you are applying the rotation after. I think more code might be needed to find your issue.
I have following code:
void DrawGLScene(unsigned char *drawing_bytes, HDC hdc, int xWidth, int yWidth) {
if ((!xWidth) || (!yWidth)) return;
BOOL returnVal = wglMakeCurrent(hdc, hrc);
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, xWidth, yWidth, 0, GL_BGR_EXT, GL_UNSIGNED_BYTE, drawing_bytes);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glViewport(0,0,xWidth,yWidth); // Reset The Current Viewport
glMatrixMode(GL_PROJECTION); // Select The Projection Matrix
glLoadIdentity(); // Reset The Projection Matrix
// Calculate The Aspect Ratio Of The Window
gluPerspective(25.0f,1.0f,0.1f,100.0f);
glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix
glLoadIdentity(); // Reset The Modelview Matrix
glEnable(GL_TEXTURE_2D); // Enable Texture Mapping
glShadeModel(GL_SMOOTH); // Enable Smooth Shading
glDisable(GL_DEPTH_TEST); // Enables Depth Testing
glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // Really Nice Perspective Calculations
glLoadIdentity(); // Reset The View
glTranslatef(0.0f,0.0f,-5.0f);
glBindTexture(GL_TEXTURE_2D, texture);
glColor4f(1.0, 1.0, 1.0, 1.0);
glBegin(GL_QUADS);
// Front Face
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 0.5f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 0.5f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 0.5f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 0.5f);
glEnd();
glSwapBuffers(hdc);
}
This code overwrites my buttons created earlier via
hInstallButton = CreateWindow(TEXT("button"), "",
WS_VISIBLE | WS_CHILD | BS_AUTOCHECKBOX,
137, 70, 13, 13,
hWnd, (HMENU) 1, GetModuleHandle(NULL), NULL);
The issue is the glSwapBuffers(), which hides the buttons for good.
This is generated by the PIXELFORMATDESCRIPTOR
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
0, // Must Support Double Buffering
PFD_TYPE_RGBA, // Request An RGBA Format
24, // 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
};
How can I force a single buffer, or something to write the buttons to both buffers? I am at a good loss here, and don't know how to do it properly (except maybe recreate the buttons with each WM_PAINT call)?
Edit:
Tried with subwindow (see code), but it creates a second window, instead of embedding into the first window.
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
hInst = hInstance; // Instanzenhandle in der globalen Variablen speichern
DWORD dwExStyle; // Window Extended Style
DWORD dwStyle; // Window Style
hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
if (!hWnd) {
return FALSE;
}
dwExStyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE | CS_OWNDC; // Window Extended Style
dwStyle=WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN; // Windows Style
WNDCLASS wndClass;
wndClass.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
wndClass.lpfnWndProc = WndProc;
wndClass.cbClsExtra = 0;
wndClass.cbWndExtra = 0;
wndClass.hInstance = hInstance;
wndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndClass.hbrBackground = CreateSolidBrush(BLACK_BRUSH);
wndClass.lpszMenuName = NULL;
wndClass.lpszClassName = "Test Window";
RegisterClass(&wndClass);
hWndOpenGL = CreateWindowEx( dwExStyle, // Extended Style For The Window
"Test Window", // Class Name
"Testy test", // Window Title
dwStyle, // Required Window Style
0, 0, // Window Position
800,
600,
hWnd, // Parent Window
NULL, // No Menu
hInstance, // Instance
NULL);
//CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
//CW_USEDEFAULT, 0, CW_USEDEFAULT-500, 0, hWnd, NULL, hInstance, NULL);
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
0, // Must Support Double Buffering
PFD_TYPE_RGBA, // Request An RGBA Format
24, // 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
};
hdcOpenGL=GetDC(hWndOpenGL);
GLuint PixelFormat; // Holds The Results After Searching For A Match
PixelFormat=ChoosePixelFormat(hdcOpenGL,&pfd);
SetPixelFormat(hdcOpenGL,PixelFormat,&pfd);
hrc=wglCreateContext(hdcOpenGL);
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
ShowWindow(hWndOpenGL, nCmdShow);
UpdateWindow(hWndOpenGL);
return TRUE;
}
I'm guessing that you created the buttons as childs of the OpenGL window. If you did this, well, then you actually did something, that's explicitly mentioned in the WGL and Win32 API documentation to break things .
The fix is simple: The OpenGL window should be a sibling to the buttons and have its very own DC: Create a own subwindow for OpenGL operations with the CS_OWNDC window class flag set and the WS_CLIPSIBLINGS | WS_CLIPCHILDREN window styles being set. Both the OpenGL subwindow and the buttons are created with the desired container window as parent.
That way the buttons will not get clobbered by OpenGL operations, even with a double buffered pixelformat.
In an application I try to use multisampling for anti-aliasing on some simple 2D geometry. It was developed originally on Windows XP where I had no problem enabling multisampling for my DirectX device and for any additional swap chains. Now, on Windows 7 the multisampling feature seems to not work at all.
I've extracted a very short example code, that does nothing but displaying a triangle. When I run the program on Windows XP, the edge is anti-aliased, but on Windows 7 it isn't.
void testDX() {
struct CustomVertex {
FLOAT x, y, z, rhw;
DWORD color;
};
CustomVertex vertices[] = {
{0.0f, 0.0f, 1.0f, 1.0f, D3DCOLOR_XRGB(255, 0, 0),},
{700.0f, 500.0f, 1.0f, 1.0f, D3DCOLOR_XRGB(255, 0, 0),},
{0.0f, 500.0f, 1.0f, 1.0f, D3DCOLOR_XRGB(255, 0, 0),},
};
HRESULT hr;
DXWindow window;
window.New(GetDesktopWindow(), "Main Window", 0, 0, 800, 600);
IDirect3D9Ptr d3d = Direct3DCreate9(D3D_SDK_VERSION);
D3DPRESENT_PARAMETERS d3dpp;
ZeroMemory(&d3dpp, sizeof d3dpp);
d3dpp.Flags = (D3DPRESENTFLAG_VIDEO | D3DPRESENTFLAG_DEVICECLIP) & ~D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
d3dpp.Windowed = TRUE;
d3dpp.hDeviceWindow = window.GetHandle();
d3dpp.BackBufferWidth = 800;
d3dpp.BackBufferHeight = 600;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.MultiSampleType = D3DMULTISAMPLE_NONMASKABLE;
d3dpp.MultiSampleQuality = 7;
d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;
//d3dpp.BackBufferFormat = m_d3ddm.Format;
d3dpp.BackBufferCount = 0;
//d3dpp.EnableAutoDepthStencil = TRUE;
//d3dpp.AutoDepthStencilFormat = D3DFMT_D16; // D3DFMT_D24X8;
IDirect3DDevice9Ptr device;
hr = d3d->CreateDevice(0, D3DDEVTYPE_HAL, window.GetHandle(), D3DCREATE_FPU_PRESERVE | D3DCREATE_HARDWARE_VERTEXPROCESSING, &d3dpp, &device);
IDirect3DSwapChain9Ptr swapChain;
hr = device->GetSwapChain(0, &swapChain);
hr = device->SetFVF(D3DFVF_XYZRHW | D3DFVF_DIFFUSE);
while (!window.ShouldQuit()) {
Sleep(50);
IDirect3DSurface9Ptr targetSurface;
hr = swapChain->GetBackBuffer(0, D3DBACKBUFFER_TYPE_MONO, &targetSurface);
hr = device->SetRenderTarget(0, targetSurface);
hr = device->Clear(0, 0, D3DCLEAR_TARGET, D3DCOLOR_ARGB(255, 0, 0, 0), 1.0f, 0);
hr = device->BeginScene();
hr = device->DrawPrimitiveUP(D3DPT_TRIANGLESTRIP, 1, vertices, sizeof CustomVertex);
hr = device->EndScene();
hr = swapChain->Present(0, 0, (HWND)0, 0, D3DPRESENT_DONOTWAIT);
}
}
I tried to compare the code with the AntiAlias sample that Microsoft ships with its DirectX SDK. And while the anti-aliasing effect works in the example code, I could not find any significant difference (however, the program flow is not very intuitive).
My question is, why does anti-aliasing via multisampling work on Windows XP but not on Windows 7 and what can I do to fix this?
Removing the D3DPRESENTFLAG_VIDEO helped to enable multisampling on Windows 7. It was added because the application uses DirectX to display video. But as the flag is not very well documented and seems to be only a hint for the video driver, I don't know which side effects setting or not setting the flag has. It has no other obvious effect, but maybe there is a performance penalty that I'm not aware of.
I've learnt a bit of OpenGL using java. Now I'm trying to transition to C++.
I'm trying to setup a window and render a quad, but its not showing up. I just get a black screen.
I'm using an example from the OpenGL Superbible as a start.
Here is my code:
#include <stdio.h>
#define GLEW_STATIC
#include "include\GL\glew.h"
#include "include\GL\wglew.h"
#pragma comment(lib, "lib\\glew32s.lib")
#pragma comment(lib, "opengl32.lib")
#pragma comment(lib, "glu32.lib")
HWND g_hWnd;
HGLRC g_hRC;
HDC g_hDC;
HINSTANCE g_hInstance;
WNDCLASS g_windClass;
RECT g_windowRect;
bool g_ContinueRendering;
void RenderScene(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glBegin(GL_QUADS);
glVertex3f(-10.0f, -10.0f, 5.0f);
glVertex3f(-10.0f, 10.0f, 5.0f);
glVertex3f(10.0f, 10.0f, 5.0f);
glVertex3f(10.0f, -10.0f, 5.0f);
glEnd();
printf("%s", gluErrorString(glGetError()));
SwapBuffers(g_hDC);
}
///////////////////////////////////////////////////////////////////////////////
// Window has changed size, or has just been created. In either case, we need
// to use the window dimensions to set the viewport and the projection matrix.
void ChangeSize(int w, int h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(90.0f, float(w) / float(h), 1.0f, 500.0f);
}
///////////////////////////////////////////////////////////////////////////////
// Callback functions to handle all window functions this app cares about.
// Once complete, pass message on to next app in the hook chain.
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
{
unsigned int key = 0;
// Handle relevant messages individually
switch(uMsg)
{
case WM_ACTIVATE:
case WM_SETFOCUS:
RenderScene();
return 0;
case WM_SIZE:
ChangeSize(LOWORD(lParam),HIWORD(lParam));
RenderScene();
break;
case WM_CLOSE:
g_ContinueRendering = false;
PostQuitMessage(0);
return 0;
default:
// Nothing to do now
break;
}
// Pass All Unhandled Messages To DefWindowProc
return DefWindowProc(hWnd,uMsg,wParam,lParam);
}
bool setupWindow(int nWidth, int nHeight)
{
bool bRetVal = true;
int nWindowX = 0;
int nWindowY = 0;
int nPixelFormat = -1;
PIXELFORMATDESCRIPTOR pfd;
DWORD dwExtStyle;
DWORD dwWindStyle;
HINSTANCE g_hInstance = GetModuleHandle(NULL);
TCHAR szWindowName[50] = TEXT("Block Redux");
TCHAR szClassName[50] = TEXT("OGL_CLASS");
// setup window class
g_windClass.lpszClassName = szClassName; // Set the name of the Class
g_windClass.lpfnWndProc = (WNDPROC)WndProc;
g_windClass.hInstance = g_hInstance; // Use this module for the module handle
g_windClass.hCursor = LoadCursor(NULL, IDC_ARROW);// Pick the default mouse cursor
g_windClass.hIcon = LoadIcon(NULL, IDI_WINLOGO);// Pick the default windows icons
g_windClass.hbrBackground = NULL; // No Background
g_windClass.lpszMenuName = NULL; // No menu for this window
g_windClass.style = CS_HREDRAW | CS_OWNDC | // set styles for this class, specifically to catch
CS_VREDRAW; // window redraws, unique DC, and resize
g_windClass.cbClsExtra = 0; // Extra class memory
g_windClass.cbWndExtra = 0; // Extra window memory
// Register the newly defined class
if(!RegisterClass( &g_windClass ))
bRetVal = false;
dwExtStyle = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;
dwWindStyle = WS_OVERLAPPEDWINDOW;
ShowCursor(TRUE);
g_windowRect.left = nWindowX;
g_windowRect.right = nWindowX + nWidth;
g_windowRect.top = nWindowY;
g_windowRect.bottom = nWindowY + nHeight;
// Setup window width and height
AdjustWindowRectEx(&g_windowRect, dwWindStyle, FALSE, dwExtStyle);
//Adjust for adornments
int nWindowWidth = g_windowRect.right - g_windowRect.left;
int nWindowHeight = g_windowRect.bottom - g_windowRect.top;
// Create window
g_hWnd = CreateWindowEx(dwExtStyle, // Extended style
szClassName, // class name
szWindowName, // window name
dwWindStyle |
WS_CLIPSIBLINGS |
WS_CLIPCHILDREN,// window stlye
nWindowX, // window position, x
nWindowY, // window position, y
nWindowWidth, // height
nWindowHeight, // width
NULL, // Parent window
NULL, // menu
g_hInstance, // instance
NULL); // pass this to WM_CREATE
// now that we have a window, setup the pixel format descriptor
g_hDC = GetDC(g_hWnd);
// Set a dummy pixel format so that we can get access to wgl functions
SetPixelFormat( g_hDC, 1,&pfd);
// Create OGL context and make it current
g_hRC = wglCreateContext( g_hDC );
wglMakeCurrent( g_hDC, g_hRC );
if (g_hDC == 0 ||
g_hDC == 0)
{
bRetVal = false;
printf("!!! An error occured creating an OpenGL window.\n");
}
// Setup GLEW which loads OGL function pointers
GLenum err = glewInit();
if (GLEW_OK != err)
{
/* Problem: glewInit failed, something is seriously wrong. */
bRetVal = false;
printf("Error: %s\n", glewGetErrorString(err));
}
const GLubyte *oglVersion = glGetString(GL_VERSION);
printf("This system supports OpenGL Version %s.\n", oglVersion);
// Now that extensions are setup, delete window and start over picking a real format.
wglMakeCurrent(NULL, NULL);
wglDeleteContext(g_hRC);
ReleaseDC(g_hWnd, g_hDC);
DestroyWindow(g_hWnd);
// Create the window again
g_hWnd = CreateWindowEx(dwExtStyle, // Extended style
szClassName, // class name
szWindowName, // window name
dwWindStyle |
WS_CLIPSIBLINGS |
WS_CLIPCHILDREN,// window stlye
nWindowX, // window position, x
nWindowY, // window position, y
nWindowWidth, // height
nWindowHeight, // width
NULL, // Parent window
NULL, // menu
g_hInstance, // instance
NULL); // pass this to WM_CREATE
g_hDC = GetDC(g_hWnd);
int nPixCount = 0;
// Specify the important attributes we care about
int pixAttribs[] =
{
WGL_SUPPORT_OPENGL_ARB, 1, // Must support OGL rendering
WGL_DRAW_TO_WINDOW_ARB, 1, // pf that can run a window
WGL_COLOR_BITS_ARB, 24, // 8 bits of each R, G and B
WGL_DEPTH_BITS_ARB, 16, // 16 bits of depth precision for window
WGL_DOUBLE_BUFFER_ARB, GL_TRUE, // Double buffered context
WGL_SAMPLE_BUFFERS_ARB, GL_TRUE, // MSAA on
WGL_SAMPLES_ARB, 8, // 8x MSAA
WGL_PIXEL_TYPE_ARB, WGL_TYPE_RGBA_ARB, // pf should be RGBA type
0 // NULL termination
};
// Ask OpenGL to find the most relevant format matching our attribs
// Only get one format back.
wglChoosePixelFormatARB(g_hDC, &pixAttribs[0], NULL, 1, &nPixelFormat, (UINT*)&nPixCount);
if(nPixelFormat == -1)
{
// Couldn't find a format, perhaps no 3D HW or drivers are installed
g_hDC = 0;
g_hDC = 0;
bRetVal = false;
printf("!!! An error occurred trying to find a pixel format with the requested attribs.\n");
}
else
{
// Got a format, now set it as the current one
SetPixelFormat( g_hDC, nPixelFormat, &pfd );
GLint attribs[] = {WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
WGL_CONTEXT_MINOR_VERSION_ARB, 3,
0 };
g_hRC = wglCreateContextAttribsARB(g_hDC, 0, attribs);
if (g_hRC == NULL)
{
printf("!!! Could not create an OpenGL 3.3 context.\n");
attribs[3] = 2;
g_hRC = wglCreateContextAttribsARB(g_hDC, 0, attribs);
if (g_hRC == NULL)
{
printf("!!! Could not create an OpenGL 3.2 context.\n");
attribs[3] = 1;
g_hRC = wglCreateContextAttribsARB(g_hDC, 0, attribs);
if (g_hRC == NULL)
{
printf("!!! Could not create an OpenGL 3.1 context.\n");
attribs[3] = 0;
g_hRC = wglCreateContextAttribsARB(g_hDC, 0, attribs);
if (g_hRC == NULL)
{
printf("!!! Could not create an OpenGL 3.0 context.\n");
printf("!!! OpenGL 3.0 and higher are not supported on this system.\n");
}
}
}
}
wglMakeCurrent( g_hDC, g_hRC );
}
if (g_hDC == 0 ||
g_hDC == 0)
{
bRetVal = false;
printf("!!! An error occured creating an OpenGL window.\n");
}
// If everything went as planned, display the window
if( bRetVal )
{
ShowWindow( g_hWnd, SW_SHOW );
SetForegroundWindow( g_hWnd );
SetFocus( g_hWnd );
g_ContinueRendering = true;
}
return bRetVal;
}
///////////////////////////////////////////////////////////////////////////////
// Cleanup window, OGL context and related state
// Called on exit and on error
bool KillWindow( )
{
bool bRetVal = true;
//Cleanup OGL RC
if(g_hRC)
{
wglMakeCurrent(NULL, NULL);
wglDeleteContext(g_hRC);
g_hRC = NULL;
}
// release the DC
if(g_hDC)
{
ReleaseDC(g_hWnd, g_hDC);
g_hDC = NULL;
}
// Destroy the window
if(g_hWnd)
{
DestroyWindow(g_hWnd);
g_hWnd = NULL;;
}
// Delete the window class
TCHAR szClassName[50] = TEXT("OGL_CLASS");
UnregisterClass(szClassName, g_hInstance);
g_hInstance = NULL;
ShowCursor(TRUE);
return bRetVal;
}
///////////////////////////////////////////////////////////////////////////////
// Main rendering loop
// Check for window messages and handle events, also draw scene
void mainLoop()
{
MSG msg;
// Check for waiting mssgs
if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
{
if (msg.message==WM_QUIT)
{
g_ContinueRendering = false;
}
else
{
// Deal with mssgs
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
else
{
RenderScene();
}
}
int main(int argc, char **argv)
{
if(setupWindow(800, 600))
{
ChangeSize(800, 600);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
while (g_ContinueRendering)
{
mainLoop();
}
}
KillWindow();
return 0;
}
I'm pretty sure all the window setup stuff is working.
If i change the glClearColor, the windows color changes.
I hope someone can see what's wrong with it.
Looking at your code, you're using OpenGL 3.x.
Try triangles, as GL_QUADS is deprecated.
Also, you should pass CreateContextAttrib the minimum version you require, you will automatically get a newer version if available.
You're drawing them behind you. The z-value of your quad is +5, but in OpenGL, forward is negative in the z direction. Change the z-value to -5 and I think you'll see something.
Or add:
glPushMatrix();
glTranslatef(0,0,-20.0f);
//Your code for drawing.
glBegin(GL_QUADS);
...
glEnd();
//Added
glPopMatrix();
I'm just shooting from the hip here, but have you tried changing the order of the vertices? This could be the culprit of backface culling.