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moonpower
2026-03-15 12:33:32 +01:00
parent af86719c5a
commit 31c2e522f5
21 changed files with 3571 additions and 1 deletions
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examples/example_sdl2_surface/main.cpp
+47
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@@ -5,11 +5,46 @@
#include "imgui_impl_sdl2.h"
#include "imgui_impl_sdlsurface2.h"
#include <SDL.h>
#include <chrono>
#include <stdio.h>
#include <string.h>
#ifdef __EMSCRIPTEN__
#include "../libs/emscripten/emscripten_mainloop_stub.h"
#endif
struct ExampleTimingHistory
{
double Samples[120];
int Count;
int Offset;
ExampleTimingHistory() : Count(0), Offset(0) { memset(Samples, 0, sizeof(Samples)); }
void AddSample(double value_ms)
{
Samples[Offset] = value_ms;
Offset = (Offset + 1) % IM_ARRAYSIZE(Samples);
if (Count < IM_ARRAYSIZE(Samples))
Count++;
}
double GetAverageMs() const
{
if (Count == 0)
return 0.0;
double total = 0.0;
for (int i = 0; i < Count; i++)
total += Samples[i];
return total / (double)Count;
}
};
static double ExampleGetTimeMs()
{
typedef std::chrono::steady_clock Clock;
return std::chrono::duration<double, std::milli>(Clock::now().time_since_epoch()).count();
}
int main(int, char**)
{
// Setup SDL
@@ -79,6 +114,8 @@ int main(int, char**)
bool show_demo_window = true;
bool show_another_window = false;
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
ExampleTimingHistory raster_times;
ExampleTimingHistory present_times;
// Main loop
bool done = false;
@@ -133,6 +170,10 @@ int main(int, char**)
ImGui_ImplSDL2_NewFrame();
ImGui::NewFrame();
int logical_w = 0;
int logical_h = 0;
SDL_GetWindowSize(window, &logical_w, &logical_h);
// 1. Show the big demo window
if (show_demo_window)
ImGui::ShowDemoWindow(&show_demo_window);
@@ -156,6 +197,8 @@ int main(int, char**)
ImGui::SameLine();
ImGui::Text("counter = %d", counter);
ImGui::Text("Raster %.3f ms | Present %.3f ms", raster_times.GetAverageMs(), present_times.GetAverageMs());
ImGui::Text("Window %d x %d | Framebuffer %d x %d", logical_w, logical_h, framebuffer->w, framebuffer->h);
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
ImGui::End();
}
@@ -173,6 +216,7 @@ int main(int, char**)
// Rendering
ImGui::Render();
const double raster_start_ms = ExampleGetTimeMs();
SDL_FillRect(framebuffer, nullptr, SDL_MapRGBA(framebuffer->format,
(Uint8)(clear_color.x * 255),
(Uint8)(clear_color.y * 255),
@@ -180,9 +224,12 @@ int main(int, char**)
(Uint8)(clear_color.w * 255)));
ImGui_ImplSDLSurface2_RenderDrawData(ImGui::GetDrawData());
raster_times.AddSample(ExampleGetTimeMs() - raster_start_ms);
const double present_start_ms = ExampleGetTimeMs();
SDL_BlitSurface(framebuffer, nullptr, window_surface, nullptr);
SDL_UpdateWindowSurface(window);
present_times.AddSample(ExampleGetTimeMs() - present_start_ms);
}
#ifdef __EMSCRIPTEN__
EMSCRIPTEN_MAINLOOP_END;