Capture/Replay: Use vector for resource maps.

unordered_map was showing up as a hotspot in replay profiling. Bug: angleproject:4916 Change-Id: I840371313ab51faa088664b9840c7ef3f998fcad Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2334094Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Manh Nguyen <nguyenmh@google.com> Commit-Queue: Jamie Madill <jmadill@chromium.org>

Capture/Replay: Use vector for resource maps.
91f54d83 · Jamie Madill · Commit Bot · 663075ac · 91f54d83
Commit 91f54d83 authored Aug 02, 2020 by Jamie Madill Committed by Commit Bot Aug 03, 2020
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FrameCapture.cpp src/libANGLE/FrameCapture.cpp +13 -2

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--- a/src/libANGLE/FrameCapture.cpp
+++ b/src/libANGLE/FrameCapture.cpp
@@ -1076,8 +1076,19 @@ void WriteCppReplayIndexFiles(bool compression,
    header << "void UpdateCurrentProgram(GLuint program);\n";
    header << "\n";
    header << "// Maps from captured Resource ID to run-time Resource ID.\n";
-    header << "using ResourceMap = std::unordered_map<GLuint, GLuint>;\n";
+    header << "class ResourceMap\n\n";
-    header << "\n";
+    header << "{\n";
+    header << "  public:\n";
+    header << "    ResourceMap() {}\n";
+    header << "    GLuint &operator[](GLuint index)\n";
+    header << "    {\n";
+    header << "        if (mIDs.size() <= static_cast<size_t>(index))\n";
+    header << "            mIDs.resize(index + 1, 0);\n";
+    header << "        return mIDs[index];\n";
+    header << "    }\n";
+    header << "  private:\n";
+    header << "    std::vector<GLuint> mIDs;\n";
+    header << "};\n";
    header << "\n";
    header << "constexpr uint32_t kReplayFrameStart = " << frameStart << ";\n";
    header << "constexpr uint32_t kReplayFrameEnd = " << frameEnd << ";\n";