Manage GPU_matrix stacks per GPUContext

Previously, we had one global `GPU_matrix` stack, so the API was not
thread safe. This patch makes the stack be per `GPUContext`, effectively
making it local per thread (`GPUContext` is located in thread local
storage).

Reviewed By: brecht
Differential Revision: https://developer.blender.org/D5405

1 files changed, 35 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_matrix_private.h b/source/blender/gpu/intern/gpu_matrix_private.h
new file mode 100644
index 00000000000..862ef065481
--- /dev/null
+++ b/source/blender/gpu/intern/gpu_matrix_private.h
@@ -0,0 +1,35 @@
+/*
+ * 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.
+ */
+
+/** \file
+ * \ingroup gpu
+ */
+
+#ifndef __GPU_MATRIX_PRIVATE_H__
+#define __GPU_MATRIX_PRIVATE_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct GPUMatrixState *GPU_matrix_state_create(void);
+void GPU_matrix_state_discard(struct GPUMatrixState *state);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __GPU_MATRIX_PRIVATE_H__ */