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xo-imgui: opengl imgui ex1 working again on wsl2

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(requires etc/hostwsl symlinks)
This commit is contained in:
Roland Conybeare 2025-09-22 21:20:09 -04:00
commit 92363a9fd5
79 changed files with 73073 additions and 142 deletions
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188
xo-imgui/example/ex1/imgui_ex1.cpp
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@ -26,7 +26,7 @@ int main(int, char **)
std::cout << "Hello, world!" << std::endl;
SDL_SetHint(SDL_HINT_VIDEO_X11_FORCE_EGL, "0");
SDL_SetHint(SDL_HINT_VIDEO_X11_FORCE_EGL, "1");
SDL_Init(SDL_INIT_VIDEO);
@ -94,7 +94,19 @@ int main(int, char **)
if (glew_status == GLEW_OK) {
std::cerr << "glewInit done" << std::endl;
} else {
std::cerr << "glewInit failed: [" << glewGetErrorString(glew_status) << std::endl;
std::cerr << "glewInit failed: [" << glewGetErrorString(glew_status) << "]" << std::endl;
return -1;
}
GLenum gl_error = glGetError();
if (gl_error != GL_NO_ERROR) {
std::cerr << "OpenGL error after glewInit: [" << gl_error << "]" << std::endl;
return -1;
}
if (!glGetString(GL_VENDOR)) {
std::cerr << "No valid OpenGL context" << std::endl;
return -1;
}
@ -117,104 +129,108 @@ int main(int, char **)
ImGui::StyleColorsDark();
ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
ImGui_ImplOpenGL3_Init("#version 330");
bool show_demo_window = true;
bool show_another_window = false;
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
float counter_value = 0.0f;
if (ImGui_ImplOpenGL3_Init("#version 330")) {
bool show_demo_window = true;
bool show_another_window = false;
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
float counter_value = 0.0f;
// Main Loop
bool done = false;
// Main Loop
bool done = false;
while (!done) {
/** poll + handle events */
SDL_Event event;
while (!done) {
/** poll + handle events */
SDL_Event event;
while (SDL_PollEvent(&event)) {
ImGui_ImplSDL2_ProcessEvent(&event);
if (event.type == SDL_QUIT)
done = true;
while (SDL_PollEvent(&event)) {
ImGui_ImplSDL2_ProcessEvent(&event);
if (event.type == SDL_QUIT)
done = true;
if ((event.type == SDL_WINDOWEVENT)
&& (event.window.event == SDL_WINDOWEVENT_CLOSE)
&& (event.window.windowID == SDL_GetWindowID(window)))
{
done = true;
if ((event.type == SDL_WINDOWEVENT)
&& (event.window.event == SDL_WINDOWEVENT_CLOSE)
&& (event.window.windowID == SDL_GetWindowID(window)))
{
done = true;
}
}
}
int w, h;
SDL_GetWindowSize(window, &w, &h);
glViewport(0, 0, w, h);
glClearColor(clear_color.x * clear_color.w,
clear_color.y * clear_color.w,
clear_color.z * clear_color.w,
clear_color.w);
glClear(GL_COLOR_BUFFER_BIT);
int w, h;
SDL_GetWindowSize(window, &w, &h);
glViewport(0, 0, w, h);
glClearColor(clear_color.x * clear_color.w,
clear_color.y * clear_color.w,
clear_color.z * clear_color.w,
clear_color.w);
glClear(GL_COLOR_BUFFER_BIT);
// draw dear imgui frame
ImGui_ImplOpenGL3_NewFrame();
ImGui_ImplSDL2_NewFrame();
ImGui::NewFrame();
ImGui::SetNextWindowPos(ImVec2(0, 0));
ImGui::SetNextWindowSize(io.DisplaySize);
ImGui::Begin("Background", nullptr,
ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize
| ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoBringToFrontOnFocus
| ImGuiWindowFlags_NoNavFocus | ImGuiWindowFlags_NoDecoration);
ImGui::End();
// 1. big demo window
if (show_demo_window)
ImGui::ShowDemoWindow(&show_demo_window);
// 2. show window that we create ourselves
{
static int counter = 0;
ImGui::Begin("Hello, world!");
ImGui::Text("This is totes useful text...");
ImGui::Checkbox("demo window", &show_demo_window);
ImGui::Checkbox("second window", &show_another_window);
ImGui::SliderFloat("float", &counter_value, 0.0f, 1.0f);
ImGui::ColorEdit3("clear color", (float*)&clear_color);
if (ImGui::Button("Button"))
++counter;
ImGui::SameLine();
ImGui::Text("counter = %d", counter);
ImGui::Text("appl average %.3f ms/frame (%.1f fps)",
1000.0f / io.Framerate, io.Framerate);
// draw dear imgui frame
ImGui_ImplOpenGL3_NewFrame();
ImGui_ImplSDL2_NewFrame();
ImGui::NewFrame();
ImGui::SetNextWindowPos(ImVec2(0, 0));
ImGui::SetNextWindowSize(io.DisplaySize);
ImGui::Begin("Background", nullptr,
ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize
| ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoBringToFrontOnFocus
| ImGuiWindowFlags_NoNavFocus | ImGuiWindowFlags_NoDecoration);
ImGui::End();
// 1. big demo window
if (show_demo_window)
ImGui::ShowDemoWindow(&show_demo_window);
// 2. show window that we create ourselves
{
static int counter = 0;
ImGui::Begin("Hello, world!");
ImGui::Text("This is totes useful text...");
ImGui::Checkbox("demo window", &show_demo_window);
ImGui::Checkbox("second window", &show_another_window);
ImGui::SliderFloat("float", &counter_value, 0.0f, 1.0f);
ImGui::ColorEdit3("clear color", (float*)&clear_color);
if (ImGui::Button("Button"))
++counter;
ImGui::SameLine();
ImGui::Text("counter = %d", counter);
ImGui::Text("appl average %.3f ms/frame (%.1f fps)",
1000.0f / io.Framerate, io.Framerate);
ImGui::End();
}
// 3. another window
if (show_another_window) {
ImGui::Begin("another window", &show_another_window);
ImGui::Text("hello from second window");
if (ImGui::Button("close me"))
show_another_window = false;
ImGui::End();
}
// rendering
ImGui::Render();
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
SDL_GL_SwapWindow(window);
}
// 3. another window
if (show_another_window) {
ImGui::Begin("another window", &show_another_window);
std::cerr << "Shutting down.." << std::endl;
ImGui::Text("hello from second window");
if (ImGui::Button("close me"))
show_another_window = false;
ImGui::End();
}
// rendering
ImGui::Render();
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
SDL_GL_SwapWindow(window);
ImGui_ImplOpenGL3_Shutdown();
} else {
std::cerr << "Failed to initialize imgui opengl3 backend, shutting down.." << std::endl;
}
std::cerr << "cleanup.." << std::endl;
ImGui_ImplOpenGL3_Shutdown();
ImGui_ImplSDL2_Shutdown();
ImGui::DestroyContext();
@ -222,7 +238,7 @@ int main(int, char **)
SDL_DestroyWindow(window);
SDL_Quit();
std::cerr << "All done, goodbye..." << std::endl;
std::cerr << "Shutdown complete, goodbye..." << std::endl;
return 0;