SDL假的全屏模式在双显示器设置下linux [英] SDL fake fullscreen mode on dual monitor setup under linux

问题描述

使用SDL 1.3我想在linux下创建假的全屏SDL_Window。如果我只有一个显示器很容易。
我刚刚得到当前显示模式并创建了一个窗口。

  SDL_GetDesktopDisplayMode（0，& mode）; 
 
 SDL_Window * win = SDL_CreateWindow（my window，
 0,0，mode.w，mode.h，
 SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN | SDL_WINDOW_BORDERLESS）; 
  

但是当我有两个显示器时，事情变得复杂。窗口跨多个监视器。

 
我使用此代码测试了
 code> int num = SDL_GetNumVideoDisplays（）; 
 for（int i = 0; i  {
 SDL_Rect displayRect; 
 SDL_GetDisplayBounds（i，& displayRect）; 
 std :: cout 
<< display<< i<< ：x，y，w，h（
 << displayRect.x<<，
<< displayRect.y<<，
 } 
  

输出：

  display 0：x，y，w，h（0，0，2960，1050）
  

但我有两个显示器（1680x1050和1280x1024）。

如何强制窗口只保留一个（假设主）显示？

解决方案

src / video / x11 / SDL_x11modes.c 检查一些有趣的 #define s：

  SDL_VIDEO_DRIVER_X11_XINERAMA 
 SDL_VIDEO_DRIVER_X11_XRANDR 
 SDL_VIDEO_DRIVER_X11_XVIDMODE 
  

您可以检查 include / SDL_config.h 您的副本正在关注。用 X11MODES_DEBUG 定义的重建也可能是有成效的。

编辑：尝试 test / testvidinfo。 X11MODES_DEBUG 在我的系统上显示 $ c $ c>内置视频驱动程序：x11，dummy
视频驱动程序：x11
显示数量：1
显示0：2646x1024 at 0,0
当前模式：2646x1024 @ 0Hz，32位每像素
红色掩码= 0x00ff0000
绿色掩码= 0x0000ff00
蓝色掩码= 0x000000ff
检测到X11 X11天线：
xinerama 0：1366x768 + 0 + 0
xinerama 1：1280x1024 + 1366 + 0
XRANDR：XRRQueryVersion：V1.3
XRANDR：mode = 0 [0]，w = 1366，h = 768，rate = 60
XRANDR：mode = 1 [0]，w = 1360，h = 768，rate = 60
XRANDR：mode = 2 [0]，w = 1024，h = 768，rate = 60
XRANDR：mode = 3 [0]，w = 800，h = 600，rate = 60
XRANDR：mode = 3 [1]，w = 800，h = 600，rate = 56
XRANDR：mode = 4 [0]，w = 640，h = 480，rate = 60
Xinerama已启用
XRandR已启用
全屏视频模式：
模式0：2646x1024 @ 0Hz，32位每像素
红色遮罩= 0x00ff0000
绿色遮罩= 0x0000ff00
蓝色遮罩= 0x000000ff
模式1：1366x768 @ 60Hz，32位每像素
红色遮罩= 0x00ff0000
绿色遮罩= 0x0000ff00
蓝色遮罩= 0x000000ff
模式2：1366x768 @ 0Hz，32位每像素
红色遮罩= 0x00ff0000
绿色掩码= 0x0000ff00
蓝色掩码= 0x000000ff
模式3：1360x768 @ 60Hz，32位每像素
红色掩码= 0x00ff0000
绿色掩码= 0x0000ff00
Blue Mask = 0x000000ff
模式4：1024x768 @ 60Hz，每像素32位
红色遮罩= 0x00ff0000
绿色遮罩= 0x0000ff00
蓝色遮罩= 0x000000ff
模式5：800x600 @ 60Hz，32位每像素
红色遮罩= 0x00ff0000
绿色遮罩= 0x0000ff00
蓝色遮罩= 0x000000ff
模式6：800x600 @ 56Hz，32位元每像素
红色遮罩= 0x00ff0000
绿色遮罩= 0x0000ff00
蓝色遮罩= 0x000000ff
模式7：640x480 @ 60Hz，32位每像素
红色面具= 0x00ff0000
绿色面具= 0x0000ff00
蓝色面具= 0x000000ff
当前分辨率：2646x1024

您可以看到SDL已经查询Xinerama并获得了我的两个显示器，但似乎没有以有用的方式回传给客户端。

可悲的是，它看起来像你需要发布到邮件列表或提交一个错误：（

Using SDL 1.3 I want to create fake fullscreen SDL_Window under linux. It is easy if i have only one display. I just got current display mode and created a window.

SDL_GetDesktopDisplayMode(0, &mode);

SDL_Window *win = SDL_CreateWindow("my window",
    0,0,mode.w, mode.h,
    SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN | SDL_WINDOW_BORDERLESS );

But when i have two displays, things get complicated. The window spreads across multiple monitors. SDL sees only one, double sized virtual display.

I tested it with this code

int num = SDL_GetNumVideoDisplays();
for( int i=0; i < num; i++ )
{
    SDL_Rect displayRect;
    SDL_GetDisplayBounds( i, &displayRect );
    std::cout
        << "display " << i << ": x,y,w,h("
        << displayRect.x << ", "
        << displayRect.y << ", "
        << displayRect.w << ", "
        << displayRect.h << ")"
        << std::endl;
}

output:

display 0: x,y,w,h(0, 0, 2960, 1050)

But i have two displays (1680x1050 and 1280x1024).

How to force the window to stay on only one (assume main) display?

解决方案

src/video/x11/SDL_x11modes.c checks some interesting #defines:

SDL_VIDEO_DRIVER_X11_XINERAMA
SDL_VIDEO_DRIVER_X11_XRANDR
SDL_VIDEO_DRIVER_X11_XVIDMODE

You might check include/SDL_config.h to see which path(s) your copy is following. Rebuilding with X11MODES_DEBUG defined may also be productive.

EDIT: Tried test/testvidinfo.c on my system with X11MODES_DEBUG and got this:

Built-in video drivers: x11, dummy
Video driver: x11
Number of displays: 1
Display 0: 2646x1024 at 0,0
  Current mode: 2646x1024@0Hz, 32 bits-per-pixel
      Red Mask = 0x00ff0000
      Green Mask = 0x0000ff00
      Blue Mask = 0x000000ff
X11 detected Xinerama:
xinerama 0: 1366x768+0+0
xinerama 1: 1280x1024+1366+0
XRANDR: XRRQueryVersion: V1.3
XRANDR: mode =    0[0], w = 1366, h =  768, rate =   60
XRANDR: mode =    1[0], w = 1360, h =  768, rate =   60
XRANDR: mode =    2[0], w = 1024, h =  768, rate =   60
XRANDR: mode =    3[0], w =  800, h =  600, rate =   60
XRANDR: mode =    3[1], w =  800, h =  600, rate =   56
XRANDR: mode =    4[0], w =  640, h =  480, rate =   60
Xinerama is enabled
XRandR is enabled
  Fullscreen video modes:
    Mode 0: 2646x1024@0Hz, 32 bits-per-pixel
        Red Mask = 0x00ff0000
        Green Mask = 0x0000ff00
        Blue Mask = 0x000000ff
    Mode 1: 1366x768@60Hz, 32 bits-per-pixel
        Red Mask = 0x00ff0000
        Green Mask = 0x0000ff00
        Blue Mask = 0x000000ff
    Mode 2: 1366x768@0Hz, 32 bits-per-pixel
        Red Mask = 0x00ff0000
        Green Mask = 0x0000ff00
        Blue Mask = 0x000000ff
    Mode 3: 1360x768@60Hz, 32 bits-per-pixel
        Red Mask = 0x00ff0000
        Green Mask = 0x0000ff00
        Blue Mask = 0x000000ff
    Mode 4: 1024x768@60Hz, 32 bits-per-pixel
        Red Mask = 0x00ff0000
        Green Mask = 0x0000ff00
        Blue Mask = 0x000000ff
    Mode 5: 800x600@60Hz, 32 bits-per-pixel
        Red Mask = 0x00ff0000
        Green Mask = 0x0000ff00
        Blue Mask = 0x000000ff
    Mode 6: 800x600@56Hz, 32 bits-per-pixel
        Red Mask = 0x00ff0000
        Green Mask = 0x0000ff00
        Blue Mask = 0x000000ff
    Mode 7: 640x480@60Hz, 32 bits-per-pixel
        Red Mask = 0x00ff0000
        Green Mask = 0x0000ff00
        Blue Mask = 0x000000ff
Current resolution: 2646x1024

You can see SDL has queried Xinerama and gotten both of my monitors but doesn't seem to communicate that back to the client in a useful manner.

Sadly it looks like you need to post to the mailing list or file a bug :(

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