c++ - OpenGL独占模式全屏

Question

DirectX 允许应用程序独占 GPU 并将其内容发送到显示器。这称为全屏。使用 OpenGL 时，使用 ChangeDisplaySettings(&dv, CDS_FULLSCREEN) 激活全屏。然而，这样做的结果是一个“假的”全屏——一个全屏窗口。两者的行为方式存在一些差异，尤其是在 alt-tab 键失焦时。

有没有办法像 DirectX 那样仅使用 Win32 api 和 OpenGL 创建全屏窗口，或者这是 DirectX 独有的功能？

Answer 1

如果你愿意让 GLUT 为你做窗口任务，你可以看这里:Full screen in openGL

如果您想自己深入了解 WIN32 的细节，您可以执行以下操作:

#include <stdlib.h>

#include <Windows.h>

#include "glew.h"
#include <gl/GL.h>
#include <gl/GLU.h>


int main()
{
    HWND hwnd;
    HDC hdc;
    int pixelFormat;
    PIXELFORMATDESCRIPTOR pfd;

    // First create the full screen window
    hwnd = CreateWindowEx(
        0 ,"STATIC","", WS_VISIBLE|WS_EX_TOPMOST,
        0,0,640,480, 0, 0, GetModuleHandle(NULL), 0
    );
    WINDOWPLACEMENT g_wpPrev = { sizeof(g_wpPrev) };
    DWORD dwStyle = GetWindowLong(hwnd, GWL_STYLE);
    MONITORINFO mi = { sizeof(mi) };
    if (
        GetWindowPlacement(hwnd, &g_wpPrev) &&
        GetMonitorInfo(MonitorFromWindow(hwnd,MONITOR_DEFAULTTOPRIMARY), &mi)
    ) {
        SetWindowLong(hwnd, GWL_STYLE, dwStyle & ~WS_OVERLAPPEDWINDOW);
        SetWindowPos(
            hwnd, HWND_TOP,
            mi.rcMonitor.left, mi.rcMonitor.top,
            mi.rcMonitor.right  - mi.rcMonitor.left,
            mi.rcMonitor.bottom - mi.rcMonitor.top,
            SWP_NOOWNERZORDER | SWP_FRAMECHANGED
        );
    }

    // Describe the pixel format
    memset(&pfd,0,sizeof(PIXELFORMATDESCRIPTOR));
    pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
    pfd.nVersion = 1;
    pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
    pfd.iPixelType = PFD_TYPE_RGBA;
    pfd.cColorBits = 32;
    pfd.cDepthBits = 16;
    pfd.iLayerType = PFD_MAIN_PLANE;

    // Create the device context and rendering context
    hdc = GetDC(hwnd);
    pixelFormat = ChoosePixelFormat(hdc,&pfd);
    SetPixelFormat(hdc,pixelFormat,&pfd);
    HGLRC rendering_context = wglCreateContext(hdc);
    BOOL rc = wglMakeCurrent(hdc, rendering_context);
    GLenum err = glewInit();
    if (GLEW_OK != err) { /*do something*/ }

    // Paint the back buffer red
    glClearColor(1,0,0,0);
    glClear(GL_COLOR_BUFFER_BIT);
    glFlush();

    // Show on screen
    rc = SwapBuffers(hdc);

    while (1)
    {
        // Do something ...
    }

    return 0;
}