77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
// ecs_test.cpp
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#include <iostream>
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#include <vector>
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#include <chrono>
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#include <algorithm>
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enum class MaterialType {
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Metal,
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Lambertian,
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Plastic,
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Glass
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};
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struct MaterialComponent {
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MaterialType type;
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float data[4]; // 模拟复杂状态
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};
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void renderMetal(const MaterialComponent&) {
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asm volatile("" ::: "memory"); // 防止编译器过度优化，模拟运算
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}
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void renderLambertian(const MaterialComponent&) {
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asm volatile("" ::: "memory");
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}
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void renderPlastic(const MaterialComponent&) {
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asm volatile("" ::: "memory");
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}
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void renderGlass(const MaterialComponent&) {
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asm volatile("" ::: "memory");
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}
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void processECS(std::vector<MaterialComponent>& materials) {
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// 按类型排序
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// std::sort(materials.begin(), materials.end(),
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// [](const MaterialComponent& a, const MaterialComponent& b) {
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// return a.type < b.type;
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// });
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size_t start = 0;
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for (size_t i = 1; i <= materials.size(); ++i) {
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if (i == materials.size() || materials[i].type != materials[start].type) {
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for (size_t j = start; j < i; ++j) {
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switch (materials[j].type) {
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case MaterialType::Metal: renderMetal(materials[j]); break;
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case MaterialType::Lambertian: renderLambertian(materials[j]); break;
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case MaterialType::Plastic: renderPlastic(materials[j]); break;
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case MaterialType::Glass: renderGlass(materials[j]); break;
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}
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}
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start = i;
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}
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}
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}
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int main() {
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const size_t count = 400000;
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std::vector<MaterialComponent> materials(count);
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for (size_t i = 0; i < count; ++i) {
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materials[i].type = static_cast<MaterialType>(i % 4);
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for (int j = 0; j < 4; ++j)
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materials[i].data[j] = static_cast<float>(i + j);
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}
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auto start_time = std::chrono::high_resolution_clock::now();
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processECS(materials);
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auto end_time = std::chrono::high_resolution_clock::now();
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auto duration = std::chrono::duration_cast<std::chrono::microseconds>(end_time - start_time);
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std::cout << "ECS Execution Time: " << duration.count() << " µs\n";
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return 0;
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}
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