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SpeedBreaker ProjectandClaude Opus 5.5
a6ade41b9f
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
88 lines
3.5 KiB
C++
88 lines
3.5 KiB
C++
// SpeedBreaker runtime. GPL-3.0-or-later (see COPYING).
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//
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// The performance overlay (Settings > Advanced): frame rate and frame times
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// as presented, and the per-frame cost of the command processor (the CPU
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// side of rendering) and of the GPU.
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#include <stdafx.h>
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#include "ui.h"
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#include <gpu/renderer.h>
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#include <imgui.h>
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namespace ui
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{
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namespace
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{
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constexpr int kHistory = 180;
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float s_frameMs[kHistory] = {}; // presented-frame intervals, a ring
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int s_frameNext = 0;
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int s_frameCount = 0;
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std::chrono::steady_clock::time_point s_lastFrame{};
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}
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void NoteGameFrame()
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{
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auto now = std::chrono::steady_clock::now();
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if (s_lastFrame.time_since_epoch().count() != 0)
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{
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float ms = std::chrono::duration<float, std::milli>(now - s_lastFrame).count();
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s_frameMs[s_frameNext] = std::min(ms, 250.0f);
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s_frameNext = (s_frameNext + 1) % kHistory;
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s_frameCount = std::min(s_frameCount + 1, kHistory);
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}
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s_lastFrame = now;
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}
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void DrawPerfOverlay()
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{
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float s = Scale();
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const ImVec2 work = ImGui::GetMainViewport()->WorkPos; // the safe area's corner
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ImGui::SetNextWindowPos(ImVec2(work.x + kSpaceL * s, work.y + kSpaceL * s), ImGuiCond_Always);
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ImGui::SetNextWindowBgAlpha(0.62f);
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// Compact, for its smaller font: the text's side inset matches the
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// space its line box leaves above it.
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ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(kSpaceM * s, kSpaceS * s));
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ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(kSpaceS * s, kSpaceXS * s));
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ImGui::PushFont(nullptr, 16.0f);
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constexpr ImGuiWindowFlags flags = ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_AlwaysAutoResize |
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ImGuiWindowFlags_NoInputs | ImGuiWindowFlags_NoNav | ImGuiWindowFlags_NoFocusOnAppearing |
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ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_NoMove;
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if (ImGui::Begin("##perf", nullptr, flags))
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{
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// The last second of presented frames (or all we have).
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float sum = 0.0f, worst = 0.0f;
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int n = 0;
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for (int i = 1; i <= s_frameCount && sum < 1000.0f; i++)
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{
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float ms = s_frameMs[(s_frameNext - i + kHistory) % kHistory];
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sum += ms;
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worst = std::max(worst, ms);
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n++;
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}
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float average = n ? sum / n : 0.0f;
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PushAccentText();
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ImGui::Text("%.0f fps", average > 0 ? 1000.0f / average : 0.0f);
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PopAccentText();
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ImGui::SameLine();
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ImGui::TextDisabled("%.1f ms (worst %.1f)", average, worst);
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// Oldest first, for the plot.
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float ordered[kHistory];
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for (int i = 0; i < s_frameCount; i++)
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ordered[i] = s_frameMs[(s_frameNext - s_frameCount + i + kHistory) % kHistory];
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// The plot's box keeps a line's gap from the text around it.
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ImGui::Spacing();
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ImGui::PlotLines("##frames", ordered, s_frameCount, 0, nullptr, 0.0f, 50.0f, ImVec2(220 * s, 36 * s));
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ImGui::Spacing();
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gpu::renderer::PerfNumbers perf = gpu::renderer::GetPerfNumbers();
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ImGui::TextDisabled("CPU render %.1f ms GPU %.1f ms", perf.cpMs, perf.gpuMs);
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ImGui::TextDisabled("%.0f draws per frame", perf.draws);
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}
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ImGui::End();
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ImGui::PopFont();
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ImGui::PopStyleVar(2);
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}
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}
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