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hoo_ven

texture problem

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here is some texture mapping code that does not work if you can tell me what is wrong that would be very helpful #include "StdAfx.h" #include <windows.h> // Header File For Windows #include <gl\gl.h> // Header File For The OpenGL32 Library #include <gl\glu.h> // Header File For The GLu32 Library #include <gl\glaux.h> // Header File For The Glaux Library #include <stdio.h> #include <stdlib.h> #include "Cube.h" #define BITMAP_ID 0x4D42 HDC hDC=NULL; // Private GDI Device Context HGLRC hRC=NULL; // Permanent Rendering Context HWND hWnd=NULL; // Holds Our Window Handle HINSTANCE hInstance; // Holds The Instance Of The Application bool keys[256]; // Array Used For The Keyboard Routine bool active=TRUE; // Window Active Flag Set To TRUE By Default bool fullscreen=TRUE; // Fullscreen Flag Set To Fullscreen Mode By Default BITMAPINFOHEADER bitmapInfoHeader; // bitmap info header unsigned char* bitmapData; // the texture data unsigned int wood; // the texture object float angle; LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); // Declaration For WndProc GLvoid ReSizeGLScene(GLsizei width, GLsizei height) // Resize And Initialize The GL Window { if (height==0) // Prevent A Divide By Zero By { height=1; // Making Height Equal One } glViewport(0,0,width,height); // Reset The Current Viewport glMatrixMode(GL_PROJECTION); // Select The Projection Matrix glLoadIdentity(); // Reset The Projection Matrix // Calculate The Aspect Ratio Of The Window gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f); glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix glLoadIdentity(); // Reset The Modelview Matrix } int InitGL(GLvoid) // All Setup For OpenGL Goes Here { glShadeModel(GL_SMOOTH); // Enable Smooth Shading glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background glClearDepth(1.0f); // Depth Buffer Setup glEnable(GL_DEPTH_TEST); // Enables Depth Testing glEnable(GL_TEXTURE_2D); glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // Really Nice Perspective Calculations return TRUE; // Initialization Went OK } int DrawGLScene(GLvoid) // Here''s Where We Do All The Drawing { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer glLoadIdentity(); // Reset The Current Modelview Matrix glTranslatef(0.0,0.0,-5); glRotatef(angle,1.0,1.0,1.0); DrawCube(); angle+=0.2; return TRUE; // Keep Going } 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 } } /* 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? { dwExnostyle=WS_EX_APPWINDOW; // Window Extended Style dwnostyle=WS_POPUP; // Windows Style ShowCursor(FALSE); // Hide Mouse Pointer } else { dwExnostyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE; // Window Extended Style dwnostyle=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 { 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); } int WINAPI WinMain( HINSTANCE hInstance, // Instance HINSTANCE hPrevInstance, // Previous Instance LPSTR lpCmdLine, // Command Line Parameters int nCmdShow) // Window Show State { MSG msg; // Windows Message Structure BOOL done=FALSE; // Bool Variable To Exit Loop // Ask The User Which Screen Mode They Prefer if (MessageBox(NULL,"Would You Like To Run In Fullscreen Mode?", "Start FullScreen?",MB_YESNO|MB_ICONQUESTION)==IDNO) { fullscreen=FALSE; // Windowed Mode } // Create Our OpenGL Window if (!CreateGLWindow("NeHe''s Rotation Tutorial",640,480,16,fullscreen)) { return 0; // Quit If Window Was Not Created } while(!done) // Loop That Runs While done=FALSE { 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 && !DrawGLScene()) || keys[VK_ESCAPE]) // Active? Was There A Quit Received? { done=TRUE; // ESC or DrawGLScene Signalled A Quit } else // Not Time To Quit, Update Screen { 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("NeHe''s Rotation Tutorial",640,480,16,fullscreen)) { return 0; // Quit If Window Was Not Created } } } } // Shutdown KillGLWindow(); // Kill The Window return (msg.wParam); // Exit The Program } unsigned char *LoadBitmapFile(char *filename, BITMAPINFOHEADER *bitmapInfoHeader) { FILE *filePtr; // the file pointer BITMAPFILEHEADER bitmapFileHeader; // bitmap file header unsigned char *bitmapImage; // bitmap image data int imageIdx = 0; // image index counter unsigned char tempRGB; // swap variable // open filename in "read binary" mode filePtr = fopen(filename, "rb"); if (filePtr == NULL) return NULL; // read the bitmap file header fread(&bitmapFileHeader, sizeof(BITMAPFILEHEADER), 1, filePtr); // verify that this is a bitmap by checking for the universal bitmap id if (bitmapFileHeader.bfType != BITMAP_ID) { fclose(filePtr); return NULL; } // read the bitmap information header fread(bitmapInfoHeader, sizeof(BITMAPINFOHEADER), 1, filePtr); // move file pointer to beginning of bitmap data fseek(filePtr, bitmapFileHeader.bfOffBits, SEEK_SET); // allocate enough memory for the bitmap image data bitmapImage = (unsigned char*)malloc(bitmapInfoHeader->biSizeImage); // verify memory allocation if (!bitmapImage) { free(bitmapImage); fclose(filePtr); return NULL; } // read in the bitmap image data fread(bitmapImage, 1, bitmapInfoHeader->biSizeImage, filePtr); // make sure bitmap image data was read if (bitmapImage == NULL) { fclose(filePtr); return NULL; } // swap the R and B values to get RGB since the bitmap color format is in BGR for (imageIdx = 0; imageIdx < bitmapInfoHeader->biSizeImage; imageIdx+=3) { tempRGB = bitmapImage[imageIdx]; bitmapImage[imageIdx] = bitmapImage[imageIdx + 2]; bitmapImage[imageIdx + 2] = tempRGB; } // close the file and return the bitmap image data fclose(filePtr); return bitmapImage; } void DrawCube() { bitmapData = LoadBitmapFile("wood.bmp", &bitmapInfoHeader); glGenTextures(1, &wood); glBindTexture(GL_TEXTURE_2D, wood); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 64, 64, 0, GL_RGB, GL_BITMAP, bitmapData); glBindTexture(GL_TEXTURE_2D, wood); glBegin(GL_QUADS); // top face glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f, 0.5f, 0.5f); glTexCoord2f(1.0f, 0.0f); glVertex3f(0.5f, 0.5f, 0.5f); glTexCoord2f(1.0f, 1.0f); glVertex3f(0.5f, 0.5f, -0.5f); glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f, -0.5f); glEnd(); glBegin(GL_QUADS); // front face glTexCoord2f(0.0f, 0.0f); glVertex3f(0.5f, -0.5f, 0.5f); glTexCoord2f(1.0f, 0.0f); glVertex3f(0.5f, 0.5f, 0.5f); glTexCoord2f(1.0f, 1.0f); glVertex3f(-0.5f, 0.5f, 0.5f); glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, -0.5f, 0.5f); glEnd(); glBegin(GL_QUADS); // right face glTexCoord2f(0.0f, 0.0f); glVertex3f(0.5f, 0.5f, -0.5f); glTexCoord2f(1.0f, 0.0f); glVertex3f(0.5f, 0.5f, 0.5f); glTexCoord2f(1.0f, 1.0f); glVertex3f(0.5f, -0.5f, 0.5f); glTexCoord2f(0.0f, 1.0f); glVertex3f(0.5f, -0.5f, -0.5f); glEnd(); glBegin(GL_QUADS); // left face glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f, 0.5f); glTexCoord2f(1.0f, 0.0f); glVertex3f(-0.5f, 0.5f, 0.5f); glTexCoord2f(1.0f, 1.0f); glVertex3f(-0.5f, 0.5f, -0.5f); glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, -0.5f, -0.5f); glEnd(); glBegin(GL_QUADS); // bottom face glTexCoord2f(0.0f, 0.0f); glVertex3f(0.5f, -0.5f, 0.5f); glTexCoord2f(1.0f, 0.0f); glVertex3f(-0.5f, -0.5f, 0.5f); glTexCoord2f(1.0f, 1.0f); glVertex3f(-0.5f, -0.5f, -0.5f); glTexCoord2f(0.0f, 1.0f); glVertex3f(0.5f, -0.5f, -0.5f); glEnd(); glBegin(GL_QUADS); // back face glTexCoord2f(0.0f, 0.0f); glVertex3f(0.5f, 0.5f, -0.5f); glTexCoord2f(1.0f, 0.0f); glVertex3f(0.5f, -0.5f, -0.5f); glTexCoord2f(1.0f, 1.0f); glVertex3f(-0.5f, -0.5f, -0.5f); glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f, -0.5f); glEnd(); }

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No offense, but I don''t expect many people will want to trawl through all that code with no idea about what they are looking for.

What isn''t working? Is the texture aligned wrong, is it simply not appearing, is it crashing?

Also, it is a good idea to use [ code ] or [ source ] tags when posting code, it makes it a lot easier to read through.

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it looks like a NeHe code so maybe you should ask there?

there are many reasons texture might not show up is its size 2^n? doed your video card support 32 bit textures (if it is 32 bit one) etc

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You don''t seem to set the texture filtering mode anywhere in the code. I guess it''s why it doesn''t work as it should.
Well, these two lines below should do the trick or rather the texture filtering mode for the current texture will be set to bilinear filtering.

glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);


Just call them before you draw anything and it should work. And you only need to call the once for each texture.

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Guest Anonymous Poster
Hi Im HuaHsin! Nice to meet you all.

I have a common problem at the end of the code in the WinMain() function. That is return msg.wParam.

Why not return 0; ?

I think there should have the reason why not return 0. Im not simply ask. I want to know why must do this. I been send an email to NeHe twice, but never reply.

Can anyone answer my question.

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