1 files changed, 90 insertions, 0 deletions
diff --git a/source/blender/gpu/intern/gpu_buffer_id.cpp b/source/blender/gpu/intern/gpu_buffer_id.cpp
new file mode 100644
index 00000000000..0c442f687a0
--- /dev/null
+++ b/source/blender/gpu/intern/gpu_buffer_id.cpp
@@ -0,0 +1,90 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2016 by Mike Erwin.
+ * All rights reserved.
+ *
+ * Contributor(s): Blender Foundation
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/gpu/intern/gwn_buffer_id.cpp
+ *  \ingroup gpu
+ *
+ * Gawain buffer IDs
+ */
+
+#include "GPU_buffer_id.h"
+
+#include <mutex>
+#include <vector>
+
+#define ORPHAN_DEBUG 0
+
+#if ORPHAN_DEBUG
+	#include <cstdio>
+#endif
+
+static std::vector<GLuint> orphaned_buffer_ids;
+
+static std::mutex orphan_mutex;
+
+extern "C" {
+extern int BLI_thread_is_main(void); /* Blender-specific function */
+}
+
+static bool thread_is_main()
+{
+	/* "main" here means the GL context's thread */
+	return BLI_thread_is_main();
+}
+
+GLuint GWN_buf_id_alloc()
+{
+	/* delete orphaned IDs */
+	orphan_mutex.lock();
+	if (!orphaned_buffer_ids.empty()) {
+		const auto orphaned_buffer_len = (uint)orphaned_buffer_ids.size();
+#if ORPHAN_DEBUG
+		printf("deleting %u orphaned VBO%s\n", orphaned_buffer_len, orphaned_buffer_len == 1 ? "" : "s");
+#endif
+		glDeleteBuffers(orphaned_buffer_len, orphaned_buffer_ids.data());
+		orphaned_buffer_ids.clear();
+	}
+	orphan_mutex.unlock();
+
+	GLuint new_buffer_id = 0;
+	glGenBuffers(1, &new_buffer_id);
+	return new_buffer_id;
+}
+
+void GWN_buf_id_free(GLuint buffer_id)
+{
+	if (thread_is_main()) {
+		glDeleteBuffers(1, &buffer_id);
+	}
+	else {
+		/* add this ID to the orphaned list */
+		orphan_mutex.lock();
+#if ORPHAN_DEBUG
+		printf("orphaning VBO %u\n", buffer_id);
+#endif
+		orphaned_buffer_ids.emplace_back(buffer_id);
+		orphan_mutex.unlock();
+	}
+}