1 files changed, 59 insertions, 0 deletions
diff --git a/source/blender/gpu/intern/gpu_query.hh b/source/blender/gpu/intern/gpu_query.hh
new file mode 100644
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+++ b/source/blender/gpu/intern/gpu_query.hh
@@ -0,0 +1,59 @@
+/*
+ * 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.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup gpu
+ */
+
+#pragma once
+
+#include "BLI_span.hh"
+
+namespace blender::gpu {
+
+typedef enum GPUQueryType {
+  GPU_QUERY_OCCLUSION = 0,
+} GPUQueryType;
+
+class QueryPool {
+ public:
+  virtual ~QueryPool(){};
+
+  /**
+   * Will start and end the query at this index inside the pool. The pool will resize
+   * automatically but does not support sparse allocation. So prefer using consecutive indices.
+   */
+  virtual void init(GPUQueryType type) = 0;
+
+  /**
+   * Will start and end the query at this index inside the pool.
+   * The pool will resize automatically.
+   */
+  virtual void begin_query(void) = 0;
+  virtual void end_query(void) = 0;
+
+  /**
+   * Must be fed with a buffer large enough to contain all the queries issued.
+   * IMPORTANT: Result for each query can be either binary or represent the number of samples
+   * drawn.
+   */
+  virtual void get_occlusion_result(MutableSpan<uint32_t> r_values) = 0;
+};
+
+}  // namespace blender::gpu
+\ No newline at end of file