kc3-lang/angle/src/libANGLE/MemoryShaderCache.cpp

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• Hash : 2a6336ed
  Author :
  Date : 2023-11-29T13:35:57
  

  Don't construct a compiler instance on shader cache hits.
  
  We can avoid constructing a shader compiler instance and then
  destroying it when we get shader cache hits. The resources and output
  type are available from the root gl::Compiler object.
  
  Bug: angleproject:8434
  Change-Id: I2de43db34dc1b86265aa648b1275e32814487ff4
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5073292
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/libANGLE/MemoryShaderCache.cpp

• //
  // Copyright 2022 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.
  //
  // MemoryShaderCache: Stores compiled shader in memory so they don't
  //   always have to be re-compiled. Can be used in conjunction with the platform
  //   layer to warm up the cache from disk.
  
  #include "libANGLE/MemoryShaderCache.h"
  
  #include <GLSLANG/ShaderVars.h>
  #include <anglebase/sha1.h>
  
  #include "common/BinaryStream.h"
  #include "common/utilities.h"
  #include "libANGLE/Compiler.h"
  #include "libANGLE/Context.h"
  #include "libANGLE/Debug.h"
  #include "libANGLE/Uniform.h"
  #include "libANGLE/histogram_macros.h"
  #include "libANGLE/renderer/ShaderImpl.h"
  #include "platform/PlatformMethods.h"
  
  namespace gl
  {
  
  namespace
  {
  // Limit decompressed programs to 5MB. If they're larger then this there is a good chance the data
  // is not what we expect. This limits the amount of memory we will allocate based on a binary blob
  // we believe is compressed data.
  static constexpr size_t kMaxUncompressedShaderSize = 5 * 1024 * 1024;
  }  // namespace
  
  MemoryShaderCache::MemoryShaderCache(egl::BlobCache &blobCache) : mBlobCache(blobCache) {}
  
  MemoryShaderCache::~MemoryShaderCache() {}
  
  bool MemoryShaderCache::getShader(const Context *context,
                                    Shader *shader,
                                    const egl::BlobCache::Key &shaderHash)
  {
      // If caching is effectively disabled, don't bother calculating the hash.
      if (!mBlobCache.isCachingEnabled())
      {
          return false;
      }
  
      angle::MemoryBuffer uncompressedData;
      switch (mBlobCache.getAndDecompress(context->getScratchBuffer(), shaderHash,
                                          kMaxUncompressedShaderSize, &uncompressedData))
      {
          case egl::BlobCache::GetAndDecompressResult::DecompressFailure:
              ANGLE_PERF_WARNING(context->getState().getDebug(), GL_DEBUG_SEVERITY_LOW,
                                 "Error decompressing shader binary data from cache.");
              return false;
  
          case egl::BlobCache::GetAndDecompressResult::NotFound:
              return false;
  
          case egl::BlobCache::GetAndDecompressResult::GetSuccess:
              if (shader->loadBinary(context, uncompressedData.data(),
                                     static_cast<int>(uncompressedData.size())))
              {
                  return true;
              }
  
              // Cache load failed, evict.
              ANGLE_PERF_WARNING(context->getState().getDebug(), GL_DEBUG_SEVERITY_LOW,
                                 "Failed to load shader binary from cache.");
              mBlobCache.remove(shaderHash);
              return false;
      }
  
      UNREACHABLE();
      return false;
  }
  
  angle::Result MemoryShaderCache::putShader(const Context *context,
                                             const egl::BlobCache::Key &shaderHash,
                                             const Shader *shader)
  {
      // If caching is effectively disabled, don't bother serializing the shader.
      if (!mBlobCache.isCachingEnabled())
      {
          return angle::Result::Continue;
      }
  
      angle::MemoryBuffer serializedShader;
      ANGLE_TRY(shader->serialize(nullptr, &serializedShader));
  
      size_t compressedSize;
      if (!mBlobCache.compressAndPut(shaderHash, std::move(serializedShader), &compressedSize))
      {
          ANGLE_PERF_WARNING(context->getState().getDebug(), GL_DEBUG_SEVERITY_LOW,
                             "Error compressing shader binary data for insertion into cache.");
          return angle::Result::Continue;
      }
  
      return angle::Result::Continue;
  }
  
  void MemoryShaderCache::clear()
  {
      mBlobCache.clear();
  }
  
  size_t MemoryShaderCache::maxSize() const
  {
      return mBlobCache.maxSize();
  }
  
  }  // namespace gl
  

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