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diff --git a/source/blender/gpu/intern/gpu_framebuffer_private.hh b/source/blender/gpu/intern/gpu_framebuffer_private.hh
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+/*
+ * 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) 2020 Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup gpu
+ */
+
+#pragma once
+
+#include "MEM_guardedalloc.h"
+
+#include "GPU_framebuffer.h"
+
+#include "glew-mx.h" /* For GLuint. To remove. */
+
+struct GPUTexture;
+
+typedef enum {
+  GPU_FB_DEPTH_ATTACHMENT = 0,
+  GPU_FB_DEPTH_STENCIL_ATTACHMENT,
+  GPU_FB_COLOR_ATTACHMENT0,
+  GPU_FB_COLOR_ATTACHMENT1,
+  GPU_FB_COLOR_ATTACHMENT2,
+  GPU_FB_COLOR_ATTACHMENT3,
+  GPU_FB_COLOR_ATTACHMENT4,
+  GPU_FB_COLOR_ATTACHMENT5,
+  /* Number of maximum output slots.
+   * We support 6 outputs for now (usually we wouldn't need more to preserve fill rate). */
+  /* Keep in mind that GL max is GL_MAX_DRAW_BUFFERS and is at least 8, corresponding to
+   * the maximum number of COLOR attachments specified by glDrawBuffers. */
+  GPU_FB_MAX_ATTACHEMENT,
+} GPUAttachmentType;
+
+namespace blender {
+namespace gpu {
+
+#define FOREACH_ATTACHMENT_RANGE(att, _start, _end) \
+  for (GPUAttachmentType att = static_cast<GPUAttachmentType>(_start); att < _end; \
+       att = static_cast<GPUAttachmentType>(att + 1))
+
+#define GPU_FB_MAX_COLOR_ATTACHMENT (GPU_FB_MAX_ATTACHEMENT - GPU_FB_COLOR_ATTACHMENT0)
+
+#define GPU_FB_DIRTY_DRAWBUFFER (1 << 15)
+
+#define GPU_FB_ATTACHEMENT_IS_DIRTY(flag, type) ((flag & (1 << type)) != 0)
+#define GPU_FB_ATTACHEMENT_SET_DIRTY(flag, type) (flag |= (1 << type))
+
+class FrameBuffer {
+ public:
+  GPUContext *ctx;
+  GLuint object;
+  GPUAttachment attachments[GPU_FB_MAX_ATTACHEMENT];
+  uint16_t dirty_flag;
+  int width, height;
+  bool multisample;
+  /* TODO Check that we always use the right context when binding
+   * (FBOs are not shared across ogl contexts). */
+  // void *ctx;
+
+ public:
+  GPUTexture *depth_tex(void) const
+  {
+    if (attachments[GPU_FB_DEPTH_ATTACHMENT].tex) {
+      return attachments[GPU_FB_DEPTH_ATTACHMENT].tex;
+    }
+    return attachments[GPU_FB_DEPTH_STENCIL_ATTACHMENT].tex;
+  };
+
+  GPUTexture *color_tex(int slot) const
+  {
+    return attachments[GPU_FB_COLOR_ATTACHMENT0 + slot].tex;
+  };
+
+  MEM_CXX_CLASS_ALLOC_FUNCS("FrameBuffer")
+};
+
+}  // namespace gpu
+}  // namespace blender