gpu/command_buffer/service/program_cache.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "gpu/command_buffer/service/program_cache.h"
   6
   7 #include <string>
   8 #include "base/memory/scoped_ptr.h"
   9 #include "gpu/command_buffer/service/shader_manager.h"
  10
  11 namespace gpu {
  12 namespace gles2 {
  13
  14 ProgramCache::ProgramCache() {}
  15 ProgramCache::~ProgramCache() {}
  16
  17 void ProgramCache::Clear() {
  18   ClearBackend();
  19   link_status_.clear();
  20 }
  21
  22 ProgramCache::LinkedProgramStatus ProgramCache::GetLinkedProgramStatus(
  23     const std::string& untranslated_a,
  24     const ShaderTranslatorInterface* translator_a,
  25     const std::string& untranslated_b,
  26     const ShaderTranslatorInterface* translator_b,
  27     const std::map<std::string, GLint>* bind_attrib_location_map) const {
  28   char a_sha[kHashLength];
  29   char b_sha[kHashLength];
  30   ComputeShaderHash(untranslated_a, translator_a, a_sha);
  31   ComputeShaderHash(untranslated_b, translator_b, b_sha);
  32
  33   char sha[kHashLength];
  34   ComputeProgramHash(a_sha,
  35                      b_sha,
  36                      bind_attrib_location_map,
  37                      sha);
  38   const std::string sha_string(sha, kHashLength);
  39
  40   LinkStatusMap::const_iterator found = link_status_.find(sha_string);
  41   if (found == link_status_.end()) {
  42     return ProgramCache::LINK_UNKNOWN;
  43   } else {
  44     return found->second;
  45   }
  46 }
  47
  48 void ProgramCache::LinkedProgramCacheSuccess(
  49     const std::string& shader_a,
  50     const ShaderTranslatorInterface* translator_a,
  51     const std::string& shader_b,
  52     const ShaderTranslatorInterface* translator_b,
  53     const LocationMap* bind_attrib_location_map) {
  54   char a_sha[kHashLength];
  55   char b_sha[kHashLength];
  56   ComputeShaderHash(shader_a, translator_a, a_sha);
  57   ComputeShaderHash(shader_b, translator_b, b_sha);
  58   char sha[kHashLength];
  59   ComputeProgramHash(a_sha,
  60                      b_sha,
  61                      bind_attrib_location_map,
  62                      sha);
  63   const std::string sha_string(sha, kHashLength);
  64
  65   LinkedProgramCacheSuccess(sha_string);
  66 }
  67
  68 void ProgramCache::LinkedProgramCacheSuccess(const std::string& program_hash) {
  69   link_status_[program_hash] = LINK_SUCCEEDED;
  70 }
  71
  72 void ProgramCache::ComputeShaderHash(
  73     const std::string& str,
  74     const ShaderTranslatorInterface* translator,
  75     char* result) const {
  76   std::string s((
  77       translator ? translator->GetStringForOptionsThatWouldAffectCompilation() :
  78                    std::string()) + str);
  79   base::SHA1HashBytes(reinterpret_cast<const unsigned char*>(s.c_str()),
  80                       s.length(), reinterpret_cast<unsigned char*>(result));
  81 }
  82
  83 void ProgramCache::Evict(const std::string& program_hash) {
  84   link_status_.erase(program_hash);
  85 }
  86
  87 namespace {
  88 size_t CalculateMapSize(const std::map<std::string, GLint>* map) {
  89   if (!map) {
  90     return 0;
  91   }
  92   std::map<std::string, GLint>::const_iterator it;
  93   size_t total = 0;
  94   for (it = map->begin(); it != map->end(); ++it) {
  95     total += 4 + it->first.length();
  96   }
  97   return total;
  98 }
  99 }  // anonymous namespace
 100
 101 void ProgramCache::ComputeProgramHash(
 102     const char* hashed_shader_0,
 103     const char* hashed_shader_1,
 104     const std::map<std::string, GLint>* bind_attrib_location_map,
 105     char* result) const {
 106   const size_t shader0_size = kHashLength;
 107   const size_t shader1_size = kHashLength;
 108   const size_t map_size = CalculateMapSize(bind_attrib_location_map);
 109   const size_t total_size = shader0_size + shader1_size + map_size;
 110
 111   scoped_ptr<unsigned char[]> buffer(new unsigned char[total_size]);
 112   memcpy(buffer.get(), hashed_shader_0, shader0_size);
 113   memcpy(&buffer[shader0_size], hashed_shader_1, shader1_size);
 114   if (map_size != 0) {
 115     // copy our map
 116     size_t current_pos = shader0_size + shader1_size;
 117     std::map<std::string, GLint>::const_iterator it;
 118     for (it = bind_attrib_location_map->begin();
 119          it != bind_attrib_location_map->end();
 120          ++it) {
 121       const size_t name_size = it->first.length();
 122       memcpy(&buffer.get()[current_pos], it->first.c_str(), name_size);
 123       current_pos += name_size;
 124       const GLint value = it->second;
 125       buffer[current_pos++] = value >> 24;
 126       buffer[current_pos++] = static_cast<unsigned char>(value >> 16);
 127       buffer[current_pos++] = static_cast<unsigned char>(value >> 8);
 128       buffer[current_pos++] = static_cast<unsigned char>(value);
 129     }
 130   }
 131   base::SHA1HashBytes(buffer.get(),
 132                       total_size, reinterpret_cast<unsigned char*>(result));
 133 }
 134
 135 }  // namespace gles2
 136 }  // namespace gpu