GPUUniformBuf: GL backend isolation

This is in preparation of vulkan backend. We move all opengl
functionnalities behind an abstract class.

This also cleansup the "dynamic" ubo create and rename it to
`GPU_uniformbuf_from_list()`

Contains, no functional change.

Part of T68990 Vulkan support.

1 files changed, 65 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_uniform_buffer_private.hh b/source/blender/gpu/intern/gpu_uniform_buffer_private.hh
new file mode 100644
index 00000000000..069a3b1c80c
--- /dev/null
+++ b/source/blender/gpu/intern/gpu_uniform_buffer_private.hh
@@ -0,0 +1,65 @@
+/*
+ * 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.
+ *
+ * Copyright 2020, Blender Foundation.
+ */
+
+/** \file
+ * \ingroup gpu
+ */
+
+#pragma once
+
+#include "BLI_sys_types.h"
+
+namespace blender {
+namespace gpu {
+
+#ifdef DEBUG
+#  define DEBUG_NAME_LEN 8
+#else
+#  define DEBUG_NAME_LEN 64
+#endif
+
+class UniformBuf {
+ protected:
+  /** Data size in bytes. */
+  size_t size_in_bytes_;
+  /** Continuous memory block to copy to GPU. This data is owned by the UniformBuf. */
+  void *data_ = NULL;
+  /** Debugging name */
+  char name_[DEBUG_NAME_LEN];
+
+ public:
+  UniformBuf(size_t size, const char *name);
+  virtual ~UniformBuf();
+
+  virtual void update(const void *data) = 0;
+  virtual void bind(int slot) = 0;
+  virtual void unbind(void) = 0;
+
+  /** Used to defer data upload at drawing time.
+   * This is useful if the thread has no context bound.
+   * This transfers ownership to this UniformBuf. */
+  void attach_data(void *data)
+  {
+    data_ = data;
+  }
+};
+
+#undef DEBUG_NAME_LEN
+
+}  // namespace gpu
+}  // namespace blender