Refuse to create FBOs for bitmaps for which we tried to create FBOs and failed.

Author: SiegeLordEx

include/allegro5/internal/aintern_opengl.h

@@ -79,6 +79,8 @@ typedef struct ALLEGRO_BITMAP_EXTRA_OPENGL
    GLuint texture; /* 0 means, not uploaded yet. */
 
    ALLEGRO_FBO_INFO *fbo_info;
+   /* We tried to create an FBO, but failed... don't keep trying. */
+   bool fbo_failed;
 
    /* When an OpenGL bitmap is locked, the locked region is usually backed by a
     * temporary memory buffer pointed to by lock_buffer.

src/opengl/ogl_fbo.c

@@ -566,6 +566,9 @@ bool _al_ogl_setup_fbo_non_backbuffer(ALLEGRO_DISPLAY *display,
 
    ASSERT(bitmap->parent == NULL);
 
+   if (ogl_bitmap->fbo_failed)
+      return false;
+
    /* When a bitmap is set as target bitmap, we try to create an FBO for it. */
    info = ogl_bitmap->fbo_info;
    if (!info) {
@@ -662,6 +665,7 @@ static void use_fbo_for_bitmap(ALLEGRO_DISPLAY *display,
       glDeleteFramebuffersEXT(1, &info->fbo);
       _al_ogl_reset_fbo_info(info);
       ogl_bitmap->fbo_info = NULL;
+      ogl_bitmap->fbo_failed = true;
    }
    else {
       display->ogl_extras->opengl_target = bitmap;