From c668921a45b7a7f5f548d0e09836f143f56b4ae0 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Sun, 31 Oct 2021 17:16:02 +0200
Subject: [PATCH] sdl: don't try gl on remote displays

---
 gl.c       |  5 +++++
 gl.h       |  8 ++++++--
 plat_sdl.c | 18 +++++++++++++++++-
 3 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/gl.c b/gl.c
index 2ebb87c..0e18c45 100644
--- a/gl.c
+++ b/gl.c
@@ -131,6 +131,11 @@ out:
 	return retval;
 }
 
+void gl_announce(void)
+{
+	printf("GL_RENDERER: %s\n", (char *)glGetString(GL_RENDERER));
+}
+
 static float vertices[] = {
 	-1.0f,  1.0f,  0.0f, // 0    0  1
 	 1.0f,  1.0f,  0.0f, // 1  ^
diff --git a/gl.h b/gl.h
index cb48071..8b7d43c 100644
--- a/gl.h
+++ b/gl.h
@@ -3,8 +3,9 @@
 
 #ifdef HAVE_GLES
 
-int gl_init(void *display, void *window, int *quirks);
-int gl_flip(const void *fb, int w, int h);
+int  gl_init(void *display, void *window, int *quirks);
+void gl_announce(void);
+int  gl_flip(const void *fb, int w, int h);
 void gl_finish(void);
 
 /* for external flips */
@@ -17,6 +18,9 @@ static __inline int gl_init(void *display, void *window, int *quirks)
 {
   return -1;
 }
+static void gl_announce(void)
+{
+}
 static __inline int gl_flip(const void *fb, int w, int h)
 {
   return -1;
diff --git a/plat_sdl.c b/plat_sdl.c
index db39bf2..6510fc1 100644
--- a/plat_sdl.c
+++ b/plat_sdl.c
@@ -186,9 +186,11 @@ int plat_sdl_init(void)
   static const char *vout_list[] = { NULL, NULL, NULL, NULL, NULL };
   const SDL_VideoInfo *info;
   SDL_SysWMinfo wminfo;
+  const char *env;
   int overlay_works = 0;
   int gl_works = 0;
   int i, ret, h;
+  int try_gl;
 
   ret = SDL_Init(SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE);
   if (ret != 0) {
@@ -274,8 +276,22 @@ int plat_sdl_init(void)
   (void)wminfo;
 #endif
 
-  ret = gl_init(display, window, &gl_quirks);
+  ret = -1;
+  try_gl = 1;
+  env = getenv("DISPLAY");
+  if (env && env[0] != ':') {
+    fprintf(stderr, "looks like a remote DISPLAY, "
+      "not trying GL (use PICOFE_GL=1 to override)\n");
+    // because some drivers just kill the program with no way to recover
+    try_gl = 0;
+  }
+  env = getenv("PICOFE_GL");
+  if (env)
+    try_gl = atoi(env);
+  if (try_gl)
+    ret = gl_init(display, window, &gl_quirks);
   if (ret == 0) {
+    gl_announce();
     gl_works = 1;
     gl_finish();
   }
-- 
2.39.2