File 0003-egl-wayland2-Fix-libdrm-loading-when-wl_drm-is-not-a.patch of Package libnvidia-egl-wayland2

From eb31eb3674829a12e8b49dee17b5f3d3ab92d31d Mon Sep 17 00:00:00 2001
From: Austin Shafer <ashafer@badland.io>
Date: Fri, 5 Sep 2025 15:14:27 -0400
Subject: [PATCH 03/18] egl-wayland2: Fix libdrm loading when wl_drm is not
 available

If the compositor does not support wl_drm and we fail to get the
drmGetDeviceFromDevId symbol then the driver load will fail. This
happens with steam due to it hijacking dlopen/dlsym. This change
has us directly dlopen libdrm and get a symbol from it instead of
relying on RTLD_DEFAULT.
---
 src/wayland/wayland-platform.c | 30 ++++++++++++++++++++++++------
 src/wayland/wayland-platform.h |  1 +
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/src/wayland/wayland-platform.c b/src/wayland/wayland-platform.c
index 72f2779..aad82af 100644
--- a/src/wayland/wayland-platform.c
+++ b/src/wayland/wayland-platform.c
@@ -89,6 +89,7 @@ PUBLIC EGLBoolean loadEGLExternalPlatform(int major, int minor,
     EplPlatformData *plat = NULL;
     EGLBoolean timelineSupported = EGL_TRUE;
     pfn_eglPlatformGetVersionNVX ptr_eglPlatformGetVersionNVX;
+    void *dlHandle = RTLD_DEFAULT;
 
     plat = eplPlatformBaseAllocate(major, minor,
         driver, extplatform, EGL_PLATFORM_WAYLAND_KHR, &WL_IMPL_FUNCS,
@@ -151,18 +152,32 @@ PUBLIC EGLBoolean loadEGLExternalPlatform(int major, int minor,
         return EGL_FALSE;
     }
 
-    plat->priv->drm.GetDeviceFromDevId = dlsym(RTLD_DEFAULT, "drmGetDeviceFromDevId");
-
     // wl_display_create_queue_with_name was added in libwayland 1.22.91. Use
     // it if it's available, but we don't otherwise need anything that recent.
-    plat->priv->wl.display_create_queue_with_name = dlsym(RTLD_DEFAULT, "wl_display_create_queue_with_name");
+    plat->priv->wl.display_create_queue_with_name = dlsym(RTLD_DEFAULT,
+                                                          "wl_display_create_queue_with_name");
+
+    // try to find drmGetDeviceFromDevId. First try the default search method,
+    // but certain application tricks may interfere with this. Most notably
+    // steam's overlay. If we can't find it through default methods fall back
+    // to directly opening libdrm.
+    plat->priv->drm.GetDeviceFromDevId = dlsym(RTLD_DEFAULT, "drmGetDeviceFromDevId");
+    if (!plat->priv->drm.GetDeviceFromDevId)
+    {
+        plat->priv->drm.libdrmDlHandle = dlopen("libdrm.so.2", RTLD_LAZY);
+        if (plat->priv->drm.libdrmDlHandle)
+        {
+            plat->priv->drm.GetDeviceFromDevId = dlsym(plat->priv->drm.libdrmDlHandle,
+                                                       "drmGetDeviceFromDevId");
+            dlHandle = plat->priv->drm.libdrmDlHandle;
+        }
+    }
 
 #define LOAD_PROC(supported, prefix, group, name) \
-    supported = supported && LoadProcHelper(plat, RTLD_DEFAULT, (void **) &plat->priv->group.name, prefix #name)
+    supported = supported && LoadProcHelper(plat, dlHandle, (void **) &plat->priv->group.name, prefix #name)
 
     // Load the functions that we'll need for explicit sync, if they're
     // available. If we don't find these, then it's not fatal.
-    LOAD_PROC(timelineSupported, "drm", drm, GetDeviceFromDevId);
     LOAD_PROC(timelineSupported, "drm", drm, GetCap);
     LOAD_PROC(timelineSupported, "drm", drm, SyncobjCreate);
     LOAD_PROC(timelineSupported, "drm", drm, SyncobjDestroy);
@@ -192,7 +207,10 @@ PUBLIC EGLBoolean loadEGLExternalPlatform(int major, int minor,
 
 void eplWlCleanupPlatform(EplPlatformData *plat)
 {
-    // Nothing to do here.
+    if (plat->priv->drm.libdrmDlHandle)
+    {
+        dlclose(plat->priv->drm.libdrmDlHandle);
+    }
 }
 
 const char *eplWlQueryString(EplPlatformData *plat, EplDisplay *pdpy, EGLExtPlatformString name)
diff --git a/src/wayland/wayland-platform.h b/src/wayland/wayland-platform.h
index 86747d4..5f89c42 100644
--- a/src/wayland/wayland-platform.h
+++ b/src/wayland/wayland-platform.h
@@ -61,6 +61,7 @@ struct _EplImplPlatform
 
     struct
     {
+        void *libdrmDlHandle;
         int (* GetDeviceFromDevId) (dev_t dev_id, uint32_t flags, drmDevicePtr *device);
         int (* GetCap) (int fd, uint64_t capability, uint64_t *value);
         int (* SyncobjCreate) (int fd, uint32_t flags, uint32_t *handle);
-- 
2.51.0