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Simulate NTSC timings for Windows desktop display modes

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This commit is contained in:
Sam Lantinga
2023-01-02 16:24:15 -08:00
parent b06e310c08
commit 72f0056961
1 changed files with 14 additions and 1 deletions
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15
src/video/windows/SDL_windowsmodes.c
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@@ -159,6 +159,19 @@ static SDL_DisplayOrientation WIN_GetDisplayOrientation(DEVMODE *mode)
}
}
static float WIN_GetRefreshRate(DEVMODE *mode)
{
/* We're not currently using DXGI to query display modes, so fake NTSC timings */
switch (mode->dmDisplayFrequency) {
case 119:
case 59:
case 29:
return ((100 * (mode->dmDisplayFrequency + 1) * 1000) / 1001) / 100.0f;
default:
return (float)mode->dmDisplayFrequency;
}
}
static SDL_bool WIN_GetDisplayMode(_THIS, LPCWSTR deviceName, DWORD index, SDL_DisplayMode *mode, SDL_DisplayOrientation *orientation)
{
SDL_DisplayModeData *data;
@@ -181,7 +194,7 @@ static SDL_bool WIN_GetDisplayMode(_THIS, LPCWSTR deviceName, DWORD index, SDL_D
mode->format = SDL_PIXELFORMAT_UNKNOWN;
mode->w = data->DeviceMode.dmPelsWidth;
mode->h = data->DeviceMode.dmPelsHeight;
mode->refresh_rate = (float)data->DeviceMode.dmDisplayFrequency;
mode->refresh_rate = WIN_GetRefreshRate(&data->DeviceMode);
/* Fill in the mode information */
WIN_UpdateDisplayMode(_this, deviceName, index, mode);