From 2c76433151ec22c752d7b7346c4895b9f7020617 Mon Sep 17 00:00:00 2001
From: Manuel Alfayate Corchete <redwindwanderer@gmail.com>
Date: Sun, 31 Jan 2021 04:04:26 +0100
Subject: [PATCH] [KMS/DRM] Merge patch for bug 5522#: Implement
 KMSDRM_GetWindowWMInfo().

---
 include/SDL_syswm.h                | 16 +++++++++++++++-
 src/video/kmsdrm/SDL_kmsdrmvideo.c | 24 +++++++++++++++---------
 2 files changed, 30 insertions(+), 10 deletions(-)

diff --git a/include/SDL_syswm.h b/include/SDL_syswm.h
index ee3705de2..d0c19ba3a 100644
--- a/include/SDL_syswm.h
+++ b/include/SDL_syswm.h
@@ -113,6 +113,10 @@ typedef void *EGLSurface;
 #endif
 #endif /* SDL_PROTOTYPES_ONLY */
 
+#if defined(SDL_VIDEO_DRIVER_KMSDRM)
+struct gbm_device;
+#endif
+
 
 #include "begin_code.h"
 /* Set up for C function definitions, even when using C++ */
@@ -138,7 +142,8 @@ typedef enum
     SDL_SYSWM_ANDROID,
     SDL_SYSWM_VIVANTE,
     SDL_SYSWM_OS2,
-    SDL_SYSWM_HAIKU
+    SDL_SYSWM_HAIKU,
+    SDL_SYSWM_KMSDRM
 } SDL_SYSWM_TYPE;
 
 /**
@@ -312,6 +317,15 @@ struct SDL_SysWMinfo
         } vivante;
 #endif
 
+#if defined(SDL_VIDEO_DRIVER_KMSDRM)
+        struct
+        {
+            int dev_index;               /**< Device index (ex: the X in /dev/dri/cardX) */
+            int drm_fd;                  /**< DRM FD (unavailable on Vulkan windows) */
+            struct gbm_device *gbm_dev;  /**< GBM device (unavailable on Vulkan windows) */
+        } kmsdrm;
+#endif
+
         /* Make sure this union is always 64 bytes (8 64-bit pointers). */
         /* Be careful not to overflow this if you add a new target! */
         Uint8 dummy[64];
diff --git a/src/video/kmsdrm/SDL_kmsdrmvideo.c b/src/video/kmsdrm/SDL_kmsdrmvideo.c
index b5fc16c40..1be7a6133 100644
--- a/src/video/kmsdrm/SDL_kmsdrmvideo.c
+++ b/src/video/kmsdrm/SDL_kmsdrmvideo.c
@@ -1370,16 +1370,22 @@ KMSDRM_RestoreWindow(_THIS, SDL_Window * window)
 SDL_bool
 KMSDRM_GetWindowWMInfo(_THIS, SDL_Window * window, struct SDL_SysWMinfo *info)
 {
-    if (info->version.major <= SDL_MAJOR_VERSION) {
-        return SDL_TRUE;
-    } else {
-        SDL_SetError("application not compiled with SDL %d.%d\n",
-                     SDL_MAJOR_VERSION, SDL_MINOR_VERSION);
-        return SDL_FALSE;
-    }
+     SDL_VideoData *viddata = ((SDL_VideoData *)_this->driverdata);
+     const Uint32 version = SDL_VERSIONNUM((Uint32)info->version.major,
+                                           (Uint32)info->version.minor,
+                                           (Uint32)info->version.patch);
+ 
+     if (version < SDL_VERSIONNUM(2, 0, 15)) {
+         SDL_SetError("Version must be 2.0.15 or newer");
+         return SDL_FALSE;
+     }
 
-    /* Failed to get window manager information */
-    return SDL_FALSE;
+     info->subsystem = SDL_SYSWM_KMSDRM;
+     info->info.kmsdrm.dev_index = viddata->devindex;
+     info->info.kmsdrm.drm_fd = viddata->drm_fd;
+     info->info.kmsdrm.gbm_dev = viddata->gbm_dev;
+ 
+     return SDL_TRUE;
 }
 
 #endif /* SDL_VIDEO_DRIVER_KMSDRM */