From 72f0056961b0df4b6c6a09aa7f0092644a1af823 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Mon, 2 Jan 2023 16:24:15 -0800
Subject: [PATCH] Simulate NTSC timings for Windows desktop display modes
---
src/video/windows/SDL_windowsmodes.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/src/video/windows/SDL_windowsmodes.c b/src/video/windows/SDL_windowsmodes.c
index 27771533bb18..2f6a18b2d98c 100644
--- a/src/video/windows/SDL_windowsmodes.c
+++ b/src/video/windows/SDL_windowsmodes.c
@@ -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);