kc3-lang/angle/src/libANGLE/renderer/metal/mtl_occlusion_query_pool.h

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• Hash : d33a2222
  Author :
  Date : 2021-04-26T16:56:15
  

  Upstream Apple's direct-to-Metal backend: compile libANGLE.
  
  This change is meant to merge the metal backend changes from Apple's
  direct-to-Metal backend. Taken from Kyle Piddington's CL:
  https://chromium-review.googlesource.com/c/angle/angle/+/2857366/
  The goal of this CL is to merge the metal backend code in a state
  that compiles, but not to switch the Metal backend over to using
  the direct-to-metal backend yet.
  
  Bug: angleproject:5505
  Bug: angleproject:6127
  Change-Id: If6783e06e0086b3a1dd25c6f53caca5cfc96cb86
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2950067
  Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
  Reviewed-by: Kenneth Russell <kbr@chromium.org>
  Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>
  

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• src/libANGLE/renderer/metal/mtl_occlusion_query_pool.h

• //
  // Copyright (c) 2020 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // mtl_occlusion_query_pool: A pool for allocating visibility query within
  // one render pass.
  //
  
  #ifndef LIBANGLE_RENDERER_METAL_MTL_OCCLUSION_QUERY_POOL_H_
  #define LIBANGLE_RENDERER_METAL_MTL_OCCLUSION_QUERY_POOL_H_
  
  #include <vector>
  
  #include "libANGLE/Context.h"
  #include "libANGLE/renderer/metal/mtl_common.h"
  #include "libANGLE/renderer/metal/mtl_resources.h"
  
  namespace rx
  {
  
  class ContextMtl;
  class QueryMtl;
  
  namespace mtl
  {
  
  class OcclusionQueryPool
  {
    public:
      OcclusionQueryPool();
      ~OcclusionQueryPool();
  
      void destroy(ContextMtl *contextMtl);
  
      // Allocate an offset in visibility buffer for a query in a render pass.
      // - clearOldValue = true, if the old value of query will be cleared before combining in the
      // visibility resolve pass. This flag is only allowed to be false for the first allocation of
      // the render pass or the query that already has an allocated offset.
      // Note: a query might have more than one allocated offset. They will be combined in the final
      // step.
      angle::Result allocateQueryOffset(ContextMtl *contextMtl, QueryMtl *query, bool clearOldValue);
      // Deallocate all offsets used for a query.
      void deallocateQueryOffset(ContextMtl *contextMtl, QueryMtl *query);
      // Retrieve a buffer that will contain the visibility results of all allocated queries for
      // a render pass
      const BufferRef &getRenderPassVisibilityPoolBuffer() const { return mRenderPassResultsPool; }
      size_t getNumRenderPassAllocatedQueries() const { return mAllocatedQueries.size(); }
      // This function is called at the end of render pass
      void resolveVisibilityResults(ContextMtl *contextMtl);
  
    private:
      // Buffer to hold the visibility results for current render pass
      BufferRef mRenderPassResultsPool;
  
      // List of allocated queries per render pass
      std::vector<QueryMtl *> mAllocatedQueries;
  
      bool mResetFirstQuery = false;
  };
  
  }  // namespace mtl
  }  // namespace rx
  
  #endif /* LIBANGLE_RENDERER_METAL_MTL_OCCLUSION_QUERY_POOL_H_ */
  

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