Evas GL: Error out on surfaceless make_current with OSMesa

While OSMesa may support surfaceless contexts, we don't support
them yet in the SW engine. Instead of switching to NULL, NULL,
let's error out and do nothing instead.

diff --git a/src/modules/evas/engines/software_generic/evas_engine.c b/src/modules/evas/engines/software_generic/evas_engine.c
index 721c4ee..7002378 100644 (file)
--- a/src/modules/evas/engines/software_generic/evas_engine.c
+++ b/src/modules/evas/engines/software_generic/evas_engine.c
@@ -123,7 +123,6 @@ typedef OSMesaContext          (*glsym_func_osm_ctx) ();
 static Evas_GL_API gl_funcs;
 static void *gl_lib_handle;
 static int gl_lib_is_gles = 0;
-static Evas_GL_API gl_funcs;
 
 static Eina_Bool _tls_init = EINA_FALSE;
 static Eina_TLS gl_current_ctx_key = 0;
@@ -3087,6 +3086,12 @@ eng_gl_make_current(void *data EINA_UNUSED, void *surface, void *context)
 
    _tls_check();
 
+   if ((!sfc) ^ (!ctx))
+     {
+        ERR("Evas GL on SW engine does not support surfaceless contexts.");
+        return 0;
+     }
+
    // Unset surface/context
    if ((!sfc) || (!ctx))
      {
@@ -3101,15 +3106,15 @@ eng_gl_make_current(void *data EINA_UNUSED, void *surface, void *context)
    if (!ctx->initialized)
      {
         if (ctx->share_ctx)
-           share_ctx = ctx->share_ctx->context;
+          share_ctx = ctx->share_ctx->context;
         else
-           share_ctx = NULL;
+          share_ctx = NULL;
 
-        ctx->context =  _sym_OSMesaCreateContextExt(sfc->internal_fmt, 
-                                                    sfc->depth_bits,
-                                                    sfc->stencil_bits,
-                                                    0,
-                                                    share_ctx);
+        ctx->context = _sym_OSMesaCreateContextExt(sfc->internal_fmt,
+                                                   sfc->depth_bits,
+                                                   sfc->stencil_bits,
+                                                   0,
+                                                   share_ctx);
         if (!ctx->context)
           {
              ERR("Error initializing context.");
@@ -4939,7 +4944,7 @@ evgl_glGetString(GLenum name)
 static void
 override_gl_apis(Evas_GL_API *api)
 {
-
+   memset(&gl_funcs, 0, sizeof(gl_funcs));
    api->version = EVAS_GL_API_VERSION;
 
 #define ORD(f) EVAS_API_OVERRIDE(f, api, _sym_)