1 // 2 // Copyright (c) 2020 The ANGLE Project Authors. All rights reserved. 3 // Use of this source code is governed by a BSD-style license that can be 4 // found in the LICENSE file. 5 // 6 // mtl_occlusion_query_pool: A pool for allocating visibility query within 7 // one render pass. 8 // 9 10 #ifndef LIBANGLE_RENDERER_METAL_MTL_OCCLUSION_QUERY_POOL_H_ 11 #define LIBANGLE_RENDERER_METAL_MTL_OCCLUSION_QUERY_POOL_H_ 12 13 #include <vector> 14 15 #include "libANGLE/Context.h" 16 #include "libANGLE/renderer/metal/mtl_common.h" 17 #include "libANGLE/renderer/metal/mtl_resources.h" 18 19 namespace rx 20 { 21 22 class ContextMtl; 23 class QueryMtl; 24 25 namespace mtl 26 { 27 28 class OcclusionQueryPool 29 { 30 public: 31 OcclusionQueryPool(); 32 ~OcclusionQueryPool(); 33 34 void destroy(ContextMtl *contextMtl); 35 36 // Allocate an offset in visibility buffer for a query in a render pass. 37 // - clearOldValue = true, if the old value of query will be cleared before combining in the 38 // visibility resolve pass. This flag is only allowed to be false for the first allocation of 39 // the render pass or the query that already has an allocated offset. 40 // Note: a query might have more than one allocated offset. They will be combined in the final 41 // step. 42 angle::Result allocateQueryOffset(ContextMtl *contextMtl, QueryMtl *query, bool clearOldValue); 43 // Deallocate all offsets used for a query. 44 void deallocateQueryOffset(ContextMtl *contextMtl, QueryMtl *query); 45 // Retrieve a buffer that will contain the visibility results of all allocated queries for 46 // a render pass getRenderPassVisibilityPoolBuffer()47 const BufferRef &getRenderPassVisibilityPoolBuffer() const { return mRenderPassResultsPool; } getNumRenderPassAllocatedQueries()48 size_t getNumRenderPassAllocatedQueries() const { return mAllocatedQueries.size(); } 49 // This function is called at the end of render pass 50 void resolveVisibilityResults(ContextMtl *contextMtl); 51 // Clear visibility pool buffer to drop previous results 52 void prepareRenderPassVisibilityPoolBuffer(ContextMtl *contextMtl); 53 54 private: 55 // Buffer to hold the visibility results for current render pass 56 BufferRef mRenderPassResultsPool; 57 58 // List of allocated queries per render pass 59 std::vector<QueryMtl *> mAllocatedQueries; 60 61 bool mResetFirstQuery = false; 62 bool mUsed = false; 63 }; 64 65 } // namespace mtl 66 } // namespace rx 67 68 #endif /* LIBANGLE_RENDERER_METAL_MTL_OCCLUSION_QUERY_POOL_H_ */ 69