1 files changed, 136 insertions, 0 deletions
diff --git a/chromium/gpu/command_buffer/service/program_cache.cc b/chromium/gpu/command_buffer/service/program_cache.cc
new file mode 100644
index 00000000000..6599d4ad3d9
--- /dev/null
+++ b/chromium/gpu/command_buffer/service/program_cache.cc
@@ -0,0 +1,136 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "gpu/command_buffer/service/program_cache.h"
+
+#include <string>
+#include "base/memory/scoped_ptr.h"
+#include "gpu/command_buffer/service/shader_manager.h"
+
+namespace gpu {
+namespace gles2 {
+
+ProgramCache::ProgramCache() {}
+ProgramCache::~ProgramCache() {}
+
+void ProgramCache::Clear() {
+  ClearBackend();
+  link_status_.clear();
+}
+
+ProgramCache::LinkedProgramStatus ProgramCache::GetLinkedProgramStatus(
+    const std::string& untranslated_a,
+    const ShaderTranslatorInterface* translator_a,
+    const std::string& untranslated_b,
+    const ShaderTranslatorInterface* translator_b,
+    const std::map<std::string, GLint>* bind_attrib_location_map) const {
+  char a_sha[kHashLength];
+  char b_sha[kHashLength];
+  ComputeShaderHash(untranslated_a, translator_a, a_sha);
+  ComputeShaderHash(untranslated_b, translator_b, b_sha);
+
+  char sha[kHashLength];
+  ComputeProgramHash(a_sha,
+                     b_sha,
+                     bind_attrib_location_map,
+                     sha);
+  const std::string sha_string(sha, kHashLength);
+
+  LinkStatusMap::const_iterator found = link_status_.find(sha_string);
+  if (found == link_status_.end()) {
+    return ProgramCache::LINK_UNKNOWN;
+  } else {
+    return found->second;
+  }
+}
+
+void ProgramCache::LinkedProgramCacheSuccess(
+    const std::string& shader_a,
+    const ShaderTranslatorInterface* translator_a,
+    const std::string& shader_b,
+    const ShaderTranslatorInterface* translator_b,
+    const LocationMap* bind_attrib_location_map) {
+  char a_sha[kHashLength];
+  char b_sha[kHashLength];
+  ComputeShaderHash(shader_a, translator_a, a_sha);
+  ComputeShaderHash(shader_b, translator_b, b_sha);
+  char sha[kHashLength];
+  ComputeProgramHash(a_sha,
+                     b_sha,
+                     bind_attrib_location_map,
+                     sha);
+  const std::string sha_string(sha, kHashLength);
+
+  LinkedProgramCacheSuccess(sha_string);
+}
+
+void ProgramCache::LinkedProgramCacheSuccess(const std::string& program_hash) {
+  link_status_[program_hash] = LINK_SUCCEEDED;
+}
+
+void ProgramCache::ComputeShaderHash(
+    const std::string& str,
+    const ShaderTranslatorInterface* translator,
+    char* result) const {
+  std::string s((
+      translator ? translator->GetStringForOptionsThatWouldEffectCompilation() :
+                   std::string()) + str);
+  base::SHA1HashBytes(reinterpret_cast<const unsigned char*>(s.c_str()),
+                      s.length(), reinterpret_cast<unsigned char*>(result));
+}
+
+void ProgramCache::Evict(const std::string& program_hash) {
+  link_status_.erase(program_hash);
+}
+
+namespace {
+size_t CalculateMapSize(const std::map<std::string, GLint>* map) {
+  if (!map) {
+    return 0;
+  }
+  std::map<std::string, GLint>::const_iterator it;
+  size_t total = 0;
+  for (it = map->begin(); it != map->end(); ++it) {
+    total += 4 + it->first.length();
+  }
+  return total;
+}
+}  // anonymous namespace
+
+void ProgramCache::ComputeProgramHash(
+    const char* hashed_shader_0,
+    const char* hashed_shader_1,
+    const std::map<std::string, GLint>* bind_attrib_location_map,
+    char* result) const {
+  const size_t shader0_size = kHashLength;
+  const size_t shader1_size = kHashLength;
+  const size_t map_size = CalculateMapSize(bind_attrib_location_map);
+  const size_t total_size = shader0_size + shader1_size + map_size;
+
+  scoped_ptr<unsigned char[]> buffer(new unsigned char[total_size]);
+  memcpy(buffer.get(), hashed_shader_0, shader0_size);
+  memcpy(&buffer[shader0_size], hashed_shader_1, shader1_size);
+  if (map_size != 0) {
+    // copy our map
+    size_t current_pos = shader0_size + shader1_size;
+    std::map<std::string, GLint>::const_iterator it;
+    for (it = bind_attrib_location_map->begin();
+         it != bind_attrib_location_map->end();
+         ++it) {
+      const size_t name_size = it->first.length();
+      memcpy(&buffer.get()[current_pos], it->first.c_str(), name_size);
+      current_pos += name_size;
+      const GLint value = it->second;
+      buffer[current_pos++] = value >> 24;
+      buffer[current_pos++] = value >> 16;
+      buffer[current_pos++] = value >> 8;
+      buffer[current_pos++] = value;
+    }
+  }
+  base::SHA1HashBytes(buffer.get(),
+                      total_size, reinterpret_cast<unsigned char*>(result));
+}
+
+}  // namespace gles2
+}  // namespace gpu