[英]Activating Multisample on OpenGL Win32
我想在 win32 API 中的 OpenGL 上下文上設置 MSAA。 一切正常,但 MSAA 只是不想激活。 這是我用於構建上下文的代碼:
void Display::CreateGLContext(HWND hWND) {
mHDC = GetDC(hWND); //get current windows device context
int nPixelFormat;
PIXELFORMATDESCRIPTOR pfd; // Create a new PIXELFORMATDESCRIPTOR (PFD)
memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR)); // Clear our PFD
pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR); // Set the size of the PFD to the size of the class
pfd.dwFlags = PFD_DOUBLEBUFFER | PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW; // Enable double buffering, opengl support and drawing to a window
pfd.iPixelType = PFD_TYPE_RGBA; // Set our application to use RGBA pixels
pfd.cColorBits = 32; // Give us 32 bits of color information (the higher, the more colors)
pfd.cDepthBits = 16; // Give us 32 bits of depth information (the higher, the more depth levels)
pfd.iLayerType = PFD_MAIN_PLANE; // Set the layer of the PFD
/* Choose best matching format*/
nPixelFormat = ChoosePixelFormat(mHDC, &pfd);
/* Set the pixel format to the device context*/
SetPixelFormat(mHDC, nPixelFormat, &pfd);
HGLRC tempRC = wglCreateContext(mHDC);
wglMakeCurrent(mHDC, tempRC);
if (glewInit() != GLEW_OK) {
MessageBox(mHWND, "Eroare", "glew", MB_OK);
}
int nPixelFormat2;
BOOL bValidPixFormat;
UINT nMaxFormats = 1;
UINT nNumFormats;
float pfAttribFList[] = { 0, 0 };
int piAttribIList[] = {
WGL_DRAW_TO_WINDOW_ARB, GL_TRUE,
WGL_SUPPORT_OPENGL_ARB, GL_TRUE,
WGL_COLOR_BITS_ARB, 32,
WGL_RED_BITS_ARB, 8,
WGL_GREEN_BITS_ARB, 8,
WGL_BLUE_BITS_ARB, 8,
WGL_ALPHA_BITS_ARB, 8,
WGL_DEPTH_BITS_ARB, 16,
WGL_STENCIL_BITS_ARB, 0,
WGL_DOUBLE_BUFFER_ARB, GL_TRUE,
WGL_PIXEL_TYPE_ARB, WGL_TYPE_RGBA_ARB,
WGL_SAMPLE_BUFFERS_ARB, GL_TRUE,
WGL_SAMPLES_ARB, 16,
0, 0 };
bValidPixFormat = wglChoosePixelFormatARB(mHDC, piAttribIList, pfAttribFList, nMaxFormats, &nPixelFormat2, &nNumFormats);
if (!bValidPixFormat)
{
MessageBox(NULL, "Invalid Pixel Format", "Error! (SetupWGLPixelFormat)", MB_OK);
}
SetPixelFormat(mHDC, nPixelFormat2, &pfd);
mGLRenderContext = wglCreateContext(mHDC);
wglMakeCurrent(mHDC, NULL);
wglDeleteContext(tempRC);
wglMakeCurrent(mHDC, mGLRenderContext);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
}
代碼工作正常,它是在主類中創建 hWnd 之后調用的,而不是在 WM_CREATE 情況下的 WndProc 中調用......有什么問題?
我找到了問題所在。 基本上你不能在本文提到的同一窗口上調用 SetPixelFormat: https ://www.khronos.org/opengl/wiki/Creating_an_OpenGL_Context_(WGL)#Proper_Context_Creation
解決方案基本上是創建一個虛擬窗口(不可見)啟用opengl並刪除它。 我已經從這里復制了代碼,它對我有用 使用 WGL 創建現代 OpenGL 上下文?
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