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perf(terrain): read a chunk's heights and mesh lists in one read each

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The heights of a terrain chunk (millions of floats in the big zones)
and the mesh index lists were read one value at a time; they are now
read in one read each, as the client does (ReadBytesTimes4 /
RAWReadU16 with a count). The values are the same.

Check in game: nothing (terrain reads the same, only faster).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Aaron Kimbrell
2026-09-29 07:39:22 -05:00
parent 21f1f3f8e1
commit eb06bc86e0
1 changed files with 11 additions and 9 deletions
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20
dCommon/Raw.cpp
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@@ -5,6 +5,7 @@
#include <fstream>
#include <algorithm>
#include <limits>
#include <stdexcept>
namespace {
constexpr uint32_t kMaxResolution = 4096;
@@ -14,6 +15,13 @@ constexpr uint32_t kMaxChunks = 1024;
namespace Raw {
// Little-endian values as the file has them, in one read (the heights of a chunk are millions of floats)
template<typename T>
static void ReadArray(std::istream& stream, std::vector<T>& values) {
stream.read(reinterpret_cast<char*>(values.data()), static_cast<std::streamsize>(values.size() * sizeof(T)));
if (!stream) throw std::runtime_error("Failed to read from istream.");
}
bool Chunk::IsValidForSceneLookup() const {
return !sceneMap.empty() && colorMapResolution > 0 && !heightMap.empty()
&& scaleFactor > 0.0f && width > 1 && height > 1;
@@ -68,9 +76,7 @@ NiPoint3 Chunk::GridToWorldPos(uint32_t i, uint32_t j) const {
try {
BinaryIO::BinaryRead(stream, meshTri.meshTriListSize);
meshTri.meshTriList.resize(meshTri.meshTriListSize);
for (uint16_t i = 0; i < meshTri.meshTriListSize; ++i) {
BinaryIO::BinaryRead(stream, meshTri.meshTriList[i]);
}
ReadArray(stream, meshTri.meshTriList);
return true;
} catch (const std::exception&) {
return false;
@@ -148,9 +154,7 @@ NiPoint3 Chunk::GridToWorldPos(uint32_t i, uint32_t j) const {
}
chunk.heightMap.resize(heightMapSize);
for (size_t i = 0; i < heightMapSize; ++i) {
BinaryIO::BinaryRead(stream, chunk.heightMap[i]);
}
ReadArray(stream, chunk.heightMap);
if (stream.fail()) {
return false;
@@ -333,9 +337,7 @@ NiPoint3 Chunk::GridToWorldPos(uint32_t i, uint32_t j) const {
return false;
}
chunk.meshVertUsage.resize(chunk.vertSize);
for (uint32_t i = 0; i < chunk.vertSize; ++i) {
BinaryIO::BinaryRead(stream, chunk.meshVertUsage[i]);
}
ReadArray(stream, chunk.meshVertUsage);
if (stream.fail()) {
return false;