Help with the basics...

Timptation · 2013-01-01T20:13:12

Why am I not seeing a red triangle on my blue screen? #pragma comment(linker, "/subsystem:windows") #include <windows.h>#pragma comment (lib, "openGL32")#include <gl/gl.h>#include <gl/glu.h> HDC g_HDC;bool fullScreen = true; void Render(){ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); glColor4f(1.0f, 0.0f, 0.0f, 0.0f); glPushMatrix();glLoadIdentity();glBegin(GL_POLYGON); float zPos = -10.0f; glVertex3f(100.0f, 100.0f, zPos);glVertex3f(200.0f, 200.0f, zPos);glVertex3f(300.0f, 100.0f, zPos); glEnd(); glPopMatrix(); glFlush(); // Bring back buffer to foreground SwapBuffers(g_HDC);} void SetupPixelFormat(HDC hDC){ int nPixelFormat; static PIXELFORMATDESCRIPTOR pfd = { sizeof(PIXELFORMATDESCRIPTOR), //size of structure 1, //default version PFD_DRAW_TO_WINDOW | //window drawing support PFD_SUPPORT_OPENGL | //opengl support PFD_DOUBLEBUFFER, //double buffering support PFD_TYPE_RGBA, //RGBA color mode 32, //32 bit color mode 0, 0, 0, 0, 0, 0, //ignore color bits 0, //no alpha buffer 0, //ignore shift bit 0, //no accumulation buffer 0, 0, 0, 0, //ignore accumulation bits 16, //16 bit z-buffer size 0, //no stencil buffer 0, //no aux buffer PFD_MAIN_PLANE, //main drawing plane 0, //reserved 0, 0, 0 }; //layer masks ignored nPixelFormat = ChoosePixelFormat(hDC, &pfd); SetPixelFormat(hDC, nPixelFormat, &pfd);} void InitOpenGL(){GLint iViewport[4]; glGetIntegerv( GL_VIEWPORT, iViewport );glViewport(0, 0, iViewport[2], iViewport[3]);glMatrixMode(GL_PROJECTION);glLoadIdentity(); glOrtho( iViewport[0], iViewport[0]+iViewport[2], iViewport[1], iViewport[1]+iViewport[3], -100.0f, 100.0f );glMatrixMode(GL_MODELVIEW);glLoadIdentity(); glEnable(GL_DEPTH_TEST);glFrontFace(GL_CW);//glPolygonMode(GL_FRONT, GL_FILL);glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);glDisable(GL_CULL_FACE); glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);//glEnable(GL_BLEND); glClearColor(0.0f, 0.0f, 1.0f, 0.0f);} /* Windows Event Procedure Handler */LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){ // Rendering and Device Context variables are declared here. static HGLRC hRC; static HDC hDC; // Width and Height for the window our robot is to be displayed in. int width, height; switch(message) { case WM_CREATE: //window being created{ hDC = GetDC(hwnd); //get current windows device context g_HDC = hDC; SetupPixelFormat(hDC); //call our pixel format setup function // Create rendering context and make it current hRC = wglCreateContext(hDC); wglMakeCurrent(hDC, hRC); InitOpenGL(); return 0; break;} case WM_CLOSE: //window is closing{ /* Deselect rendering context and delete it*/ wglMakeCurrent(hDC, NULL); wglDeleteContext(hRC); /* Send quit message to queue*/ PostQuitMessage(0); return 0; break;} case WM_SIZE:{ /* Retrieve width and height*/ height = HIWORD(lParam); width = LOWORD(lParam); /* Don't want a divide by 0*/ if (height == 0) height = 1; /* Reset the viewport to new dimensions*/ glViewport(0, 0, width, height); /* Set current Matrix to projection and load in the orthographic matrix*/ //glMatrixMode(GL_PROJECTION); //glLoadIdentity(); //reset projection matrix//glOrtho(... //glMatrixMode(GL_MODELVIEW); //set modelview matrix //glLoadIdentity(); //reset modelview matrix return 0; break;} default:{ break;} } return (DefWindowProc(hwnd, message, wParam, lParam));} int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow){// Getting rid of unused variable warnings.(nCmdShow);(lpCmdLine);(hPrevInstance); WNDCLASSEX windowClass; //window class HWND hwnd; //window handle MSG msg = MSG(); //message bool done; //flag for completion of app DWORD dwExStyle; //window extended style DWORD dwStyle; //window style RECT windowRect; /* Screen/display attributes*/ int width = 2880; int height = 1800; int bits = 32; 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 /* Fill out the window class structure*/ windowClass.cbSize = sizeof(WNDCLASSEX); windowClass.style = CS_HREDRAW | CS_VREDRAW; windowClass.lpfnWndProc = WndProc; windowClass.cbClsExtra = 0; windowClass.cbWndExtra = 0; windowClass.hInstance = hInstance; windowClass.hIcon = LoadIcon(NULL, IDI_APPLICATION); windowClass.hCursor = LoadCursor(NULL, IDC_ARROW); windowClass.hbrBackground = NULL; windowClass.lpszMenuName = NULL; windowClass.lpszClassName = "MyClass"; windowClass.hIconSm = LoadIcon(NULL, IDI_WINLOGO); /* Register window class*/ if (!RegisterClassEx(&windowClass)) return 0; /* Check if fullscreen is on*/ if (fullScreen) { DEVMODE dmScreenSettings; memset(&dmScreenSettings, 0, sizeof(dmScreenSettings)); dmScreenSettings.dmSize = sizeof(dmScreenSettings); dmScreenSettings.dmPelsWidth = width; //screen width dmScreenSettings.dmPelsHeight = height; //screen height dmScreenSettings.dmBitsPerPel = bits; //bits per pixel dmScreenSettings.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT; if( ChangeDisplaySettings(&dmScreenSettings, CDS_FULLSCREEN != DISP_CHANGE_SUCCESSFUL) ) { /* Setting display mode failed, switch to windowed*/ MessageBox(NULL, "Display mode failed", NULL, MB_OK); fullScreen = false; } } /* Check if fullscreen is still on*/ if (fullScreen) { 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); /* Class registerd, so now create our window*/ hwnd = CreateWindowEx(NULL, "MyClass", //class name"2D_Project", //app namedwStyle |WS_CLIPCHILDREN |WS_CLIPSIBLINGS,0, 0, //x and y coordswindowRect.right - windowRect.left,windowRect.bottom - windowRect.top, //width, heightNULL, //handle to parentNULL, //handle to menuhInstance, //application instanceNULL); //no xtra params /* Check if window creation failed (hwnd = null ?)*/ if (!hwnd)return 0; ShowWindow(hwnd, SW_SHOW); //display window UpdateWindow(hwnd); //update window done = false; //initialize loop condition variable /* Main message loop*/ while (!done) { PeekMessage(&msg, hwnd, NULL, NULL, PM_REMOVE); if (msg.message == WM_QUIT) //did we receive a quit message? {done = true;} else { Render(); TranslateMessage(&msg); DispatchMessage(&msg); } } if (fullScreen) { ChangeDisplaySettings(NULL, 0); ShowCursor(TRUE); } return msg.wParam;}

Graphics and GPU Programming Programming OpenGL

Started by Timptation January 01, 2013 04:44 PM

11 comments, last by GeneralQuery 11 years, 4 months ago

Timptation

132

Author

January 01, 2013 07:00 PM

Ok, I just verified that everything is fine on another machine. I can only assume the issue has to do with apple's retina display tech. I know they have some kind of new resolution independence code that messes with how the drawing for the new display works. I won't claim to fully understand it, but it must be something to do with it. Their windows drivers must be doing something similar and keeping me from seeing what I expect to see.

The issue only appears in fullscreen mode. Development on this macbook will have to happen in windowed mode. If anyone has a solution, or even explanation, that would be great.

Thanks a bunch for your help GeneralQuery!

Dragonsoulj

3,213

January 01, 2013 08:04 PM

Last I checked when researching some Wordpress graphics was that the retina technology takes an image with double the resolution (200% of the original) and reduces it, so you have more pixels per inch (I guess that would mean 4 pixels in the space 1 pixel normally takes up).

GeneralQuery

1,264

January 01, 2013 08:13 PM

Oh, I forgot to mention. Re: code tags. The correct usage is using square brackets rather than angle brackets, i.e.:


 
[code]type your code here[/code]

I wouldn't worry so much about it for your OP but it's useful to keep in mind for future posts as people with short attention spans (such as myself!) tend to zone out and hit the back button when confronted with a wall of unformatted code

Help with the basics...

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