From e4ee54be24f0298aea6f8d8886a6f77bd1cb0534 Mon Sep 17 00:00:00 2001
From: Patrice Mandin <patmandin@gmail.com>
Date: Sun, 8 Jan 2006 10:22:27 +0000
Subject: [PATCH] Load default OpenGL library if needed at driver
 initialization

---
 src/video/ataricommon/SDL_atarigl.c | 17 ++++++++++++++---
 src/video/gem/SDL_gemvideo.c        |  1 +
 src/video/xbios/SDL_xbios.c         |  1 +
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/video/ataricommon/SDL_atarigl.c b/src/video/ataricommon/SDL_atarigl.c
index fb8b56885..b0e59d6a5 100644
--- a/src/video/ataricommon/SDL_atarigl.c
+++ b/src/video/ataricommon/SDL_atarigl.c
@@ -134,11 +134,21 @@ int SDL_AtariGL_LoadLibrary(_THIS, const char *path)
 		return -1;
 	}
 
-	/* Unload previous driver */
-	SDL_AtariGL_UnloadLibrary(this);
+	/* Driver already loaded ? */
+	if (this->gl_config.driver_loaded) {
+		/* Default path ? don't change anything */
+		if (path==NULL) {
+			return 0;
+		}
+		/* Unload previous driver */
+		SDL_AtariGL_UnloadLibrary(this);
+	}
 
 	/* Load library given by path */
-	handle = SDL_LoadObject(path);
+	handle = NULL
+	if (path != NULL) {
+		handle = SDL_LoadObject(path);
+	}
 	if (handle == NULL) {
 		/* Try to load another one */
 		path = getenv("SDL_VIDEO_GL_DRIVER");
@@ -398,6 +408,7 @@ static void SDL_AtariGL_UnloadLibrary(_THIS)
 	if (this->gl_config.dll_handle) {
 		SDL_UnloadObject(this->gl_config.dll_handle);
 		this->gl_config.dll_handle = NULL;
+		this->gl_config.driver_loaded = 0;
 
 		/* Restore pointers to static library */
 		SDL_AtariGL_InitPointers(this);
diff --git a/src/video/gem/SDL_gemvideo.c b/src/video/gem/SDL_gemvideo.c
index 6a6d434d4..59947d4e0 100644
--- a/src/video/gem/SDL_gemvideo.c
+++ b/src/video/gem/SDL_gemvideo.c
@@ -468,6 +468,7 @@ int GEM_VideoInit(_THIS, SDL_PixelFormat *vformat)
 
 #ifdef HAVE_OPENGL
 	SDL_AtariGL_InitPointers(this);
+	SDL_AtariGL_LoadLibrary(this, NULL);
 #endif
 
 	/* We're done! */
diff --git a/src/video/xbios/SDL_xbios.c b/src/video/xbios/SDL_xbios.c
index fa1caed4a..40b895c5e 100644
--- a/src/video/xbios/SDL_xbios.c
+++ b/src/video/xbios/SDL_xbios.c
@@ -464,6 +464,7 @@ static int XBIOS_VideoInit(_THIS, SDL_PixelFormat *vformat)
 
 #ifdef HAVE_OPENGL
 	SDL_AtariGL_InitPointers(this);
+	SDL_AtariGL_LoadLibrary(this, NULL);
 #endif
 
 	/* We're done! */