Make libglx optional (alpine doesn't have it)

2 files changed, 5 insertions, 7 deletions

diff --git a/README.md b/README.md
index d952ba8..91e07c9 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ Right now mgl only supports x11. Mgl allows you to choose glx or egl at runtime.
 ## Build
 `x11, libxrender, libxrandr`
 ## Runtime
-`libglvnd (libGL.so, libGLX.so, libEGL.so)`
+`libglvnd (libGL.so, libEGL.so)`
 # Notes
 Every window _get_ function is cached from the last event poll, no calls to x11 is made.\
 Only one window can be created and used at once.\
diff --git a/src/gl.c b/src/gl.c
index d905eb0..7c9a6bc 100644
--- a/src/gl.c
+++ b/src/gl.c
@@ -116,8 +116,11 @@ static int mgl_gl_load_glx(mgl_gl *self) {
         { NULL, NULL }
     };
 
+    /* In some distros (alpine for example libGLX doesn't exist, but libGL can be used instead) */
+    void *library = self->glx_library ? self->glx_library : self->gl_library;
+
     for(int i = 0; required_dlsym[i].func; ++i) {
-        *required_dlsym[i].func = dlsym_print_fail(self->glx_library, required_dlsym[i].name, 1);
+        *required_dlsym[i].func = dlsym_print_fail(library, required_dlsym[i].name, 1);
         if(!*required_dlsym[i].func)
             return -1;
     }
@@ -169,11 +172,6 @@ int mgl_gl_load(mgl_gl *self) {
     }
 
     self->glx_library = dlopen("libGLX.so.0", RTLD_LAZY);
-    if(!self->glx_library) {
-        fprintf(stderr, "mgl error:dlopen(\"%s\", RTLD_LAZY) failed\n", "libGLX.so.0");
-        mgl_gl_unload(self);
-        return -1;
-    }
 
     self->egl_library = dlopen("libEGL.so.1", RTLD_LAZY);
     if(!self->egl_library) {