1 files changed, 94 insertions, 0 deletions
diff --git a/source/blender/draw/intern/draw_view.hh b/source/blender/draw/intern/draw_view.hh
new file mode 100644
index 00000000000..27e7a7a0028
--- /dev/null
+++ b/source/blender/draw/intern/draw_view.hh
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright 2022 Blender Foundation. */
+
+#pragma once
+
+/** \file
+ * \ingroup draw
+ */
+
+#include "DRW_gpu_wrapper.hh"
+#include "DRW_render.h"
+
+#include "draw_shader_shared.h"
+
+namespace blender::draw {
+
+class Manager;
+
+/* TODO: de-duplicate. */
+using ObjectBoundsBuf = StorageArrayBuffer<ObjectBounds, 128>;
+/** \note Using uint4 for declaration but bound as uint. */
+using VisibilityBuf = StorageArrayBuffer<uint4, 1, true>;
+
+class View {
+  friend Manager;
+
+ private:
+  UniformBuffer<ViewInfos> data_;
+  /** Frozen version of data_ used for debugging culling. */
+  UniformBuffer<ViewInfos> data_freeze_;
+  /** Result of the visibility computation. 1 bit per resource ID. */
+  VisibilityBuf visibility_buf_;
+
+  const char *debug_name_;
+
+  bool do_visibility_ = true;
+  bool dirty_ = true;
+  bool frozen_ = false;
+
+ public:
+  View(const char *name) : visibility_buf_(name), debug_name_(name){};
+  /* For compatibility with old system. Will be removed at some point. */
+  View(const char *name, const DRWView *view) : visibility_buf_(name), debug_name_(name)
+  {
+    float4x4 view_mat, win_mat;
+    DRW_view_viewmat_get(view, view_mat.ptr(), false);
+    DRW_view_winmat_get(view, win_mat.ptr(), false);
+    this->sync(view_mat, win_mat);
+  }
+
+  void set_clip_planes(Span<float4> planes);
+
+  void sync(const float4x4 &view_mat, const float4x4 &win_mat);
+
+  bool is_persp() const
+  {
+    return data_.winmat[3][3] == 0.0f;
+  }
+
+  bool is_inverted() const
+  {
+    return data_.is_inverted;
+  }
+
+  float far_clip() const
+  {
+    if (is_persp()) {
+      return -data_.winmat[3][2] / (data_.winmat[2][2] + 1.0f);
+    }
+    return -(data_.winmat[3][2] - 1.0f) / data_.winmat[2][2];
+  }
+
+  float near_clip() const
+  {
+    if (is_persp()) {
+      return -data_.winmat[3][2] / (data_.winmat[2][2] - 1.0f);
+    }
+    return -(data_.winmat[3][2] + 1.0f) / data_.winmat[2][2];
+  }
+
+ private:
+  /** Called from draw manager. */
+  void bind();
+  void compute_visibility(ObjectBoundsBuf &bounds, uint resource_len, bool debug_freeze);
+
+  void update_view_vectors();
+  void update_viewport_size();
+
+  void frustum_boundbox_calc(BoundBox &bbox);
+  void frustum_culling_planes_calc();
+  void frustum_culling_sphere_calc(const BoundBox &bbox, BoundSphere &bsphere);
+};
+
+}  // namespace blender::draw