xo-alloc: + gc history xo-imgui: gui examples
This commit is contained in:
parent
cbaa4c90f8
commit
f4be2e765e
20 changed files with 2015 additions and 18 deletions
329
xo-imgui/example/ex1/imgui_ex1.cpp
Normal file
329
xo-imgui/example/ex1/imgui_ex1.cpp
Normal file
|
|
@ -0,0 +1,329 @@
|
|||
/* xo-imgui/example/ex1/imgui_ex1.cpp
|
||||
*
|
||||
* author: Roland Conybeare, Aug 2025
|
||||
*/
|
||||
|
||||
#include <SDL.h>
|
||||
#include <GL/glew.h>
|
||||
|
||||
#include "SDL_events.h"
|
||||
#include "imgui.h"
|
||||
#include "backends/imgui_impl_sdl2.h"
|
||||
#include "backends/imgui_impl_opengl3.h"
|
||||
|
||||
//#include <GLFW/glfw3.h>
|
||||
|
||||
#ifdef NOPE
|
||||
#include <SDL_opengl.h>
|
||||
#endif
|
||||
|
||||
#include <iostream>
|
||||
#include <unistd.h>
|
||||
|
||||
int main(int, char **)
|
||||
{
|
||||
using namespace std;
|
||||
|
||||
std::cout << "Hello, world!" << std::endl;
|
||||
|
||||
SDL_SetHint(SDL_HINT_VIDEO_X11_FORCE_EGL, "0");
|
||||
|
||||
SDL_Init(SDL_INIT_VIDEO);
|
||||
|
||||
SDL_version compiled;
|
||||
SDL_VERSION(&compiled);
|
||||
std::cerr << "SDL version: "
|
||||
<< (int)compiled.major
|
||||
<< "." << (int)compiled.minor
|
||||
<< "." << (int)compiled.patch
|
||||
<< std::endl;
|
||||
|
||||
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
|
||||
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
|
||||
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK,
|
||||
SDL_GL_CONTEXT_PROFILE_CORE);
|
||||
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
|
||||
|
||||
#if 0
|
||||
SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS,
|
||||
SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG);
|
||||
#endif
|
||||
|
||||
std::cerr << "SDL video driver: " << SDL_GetCurrentVideoDriver() << std::endl;
|
||||
|
||||
SDL_Window * window = SDL_CreateWindow("imgui + sdl2 + opengl",
|
||||
SDL_WINDOWPOS_CENTERED,
|
||||
SDL_WINDOWPOS_CENTERED,
|
||||
1280,
|
||||
720,
|
||||
SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
|
||||
if (window) {
|
||||
std::cerr << "SDL_CreateWindow done" << std::endl;
|
||||
} else {
|
||||
std::cerr << "SDL_CreateWindow failed: [" << SDL_GetError() << "]" << std::endl;
|
||||
SDL_Quit();
|
||||
return -1;
|
||||
}
|
||||
|
||||
SDL_GLContext gl_context = SDL_GL_CreateContext(window);
|
||||
|
||||
int major, minor;
|
||||
SDL_GL_GetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, &major);
|
||||
SDL_GL_GetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, &minor);
|
||||
|
||||
std::cerr << "Requested OpenGL version: " << major << "." << minor << std::endl;
|
||||
|
||||
if (gl_context) {
|
||||
std::cerr << "SDL_GL_CreateContext done" << std::endl;
|
||||
} else {
|
||||
std::cerr << "SDL_GL_CreateContext failed: [" << SDL_GetError() << "]" << std::endl;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (SDL_GL_MakeCurrent(window, gl_context) != 0) {
|
||||
std::cerr << "SDL_GL_MakeCurrent failed: [" << SDL_GetError() << "]" << std::endl;
|
||||
SDL_GL_DeleteContext(gl_context);
|
||||
SDL_DestroyWindow(window);
|
||||
SDL_Quit();
|
||||
return -1;
|
||||
}
|
||||
|
||||
SDL_GL_SetSwapInterval(1); // enable vsync
|
||||
|
||||
GLenum glew_status = glewInit();
|
||||
if (glew_status == GLEW_OK) {
|
||||
std::cerr << "glewInit done" << std::endl;
|
||||
} else {
|
||||
std::cerr << "glewInit failed: [" << glewGetErrorString(glew_status) << std::endl;
|
||||
return -1;
|
||||
}
|
||||
|
||||
const GLubyte * version = glGetString(GL_VERSION);
|
||||
|
||||
glEnable(GL_BLEND);
|
||||
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
|
||||
|
||||
if (version) {
|
||||
std::cerr << "OpenGL version: [" << version << "]" << std::endl;
|
||||
} else {
|
||||
std::cerr << "OpenGL version not available" << std::endl;
|
||||
}
|
||||
|
||||
IMGUI_CHECKVERSION();
|
||||
ImGui::CreateContext();
|
||||
ImGuiIO & io = ImGui::GetIO(); (void)io;
|
||||
io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
|
||||
|
||||
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;
|
||||
|
||||
// Main Loop
|
||||
bool done = false;
|
||||
|
||||
while (!done) {
|
||||
/** poll + handle events */
|
||||
SDL_Event event;
|
||||
|
||||
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;
|
||||
}
|
||||
}
|
||||
|
||||
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);
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
std::cerr << "cleanup.." << std::endl;
|
||||
|
||||
ImGui_ImplOpenGL3_Shutdown();
|
||||
ImGui_ImplSDL2_Shutdown();
|
||||
ImGui::DestroyContext();
|
||||
|
||||
SDL_GL_DeleteContext(gl_context);
|
||||
SDL_DestroyWindow(window);
|
||||
SDL_Quit();
|
||||
|
||||
std::cerr << "All done, goodbye..." << std::endl;
|
||||
|
||||
return 0;
|
||||
|
||||
#ifdef NOPE2
|
||||
if (!glfwInit()) {
|
||||
std::cerr << "glfwInit failed!" << std::endl;
|
||||
return -1;
|
||||
}
|
||||
|
||||
std::cout << "GLFW version: " << glfwGetVersionString() << std::endl;
|
||||
|
||||
// configure glfw
|
||||
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
|
||||
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
|
||||
// this fails in nix-on-wsl
|
||||
//glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
|
||||
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_ANY_PROFILE);
|
||||
// maybe:
|
||||
//glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
|
||||
// may need explicit hints
|
||||
//glfwWindowHint(GLFW_RED_BITS, 8)
|
||||
//glfwWindowHint(GLFW_GREEN_BITS, 8)
|
||||
//glfwWindowHint(GLFW_BLUE_BITS, 8)
|
||||
//glfwWindowHint(GLFW_ALPHA_BITS, 8)
|
||||
//glfwWindowHint(GLFW_DEPTH_BITS, 24)
|
||||
//glfwWindowHint(GLFW_STENCIL_BITS, 8)
|
||||
//glfwWindowHint(GLFW_DOUBLEBUFFER, GL_TRUE)
|
||||
//
|
||||
// try
|
||||
// $ glxinfo
|
||||
// to get framebuffer info
|
||||
|
||||
// Not working because:
|
||||
// eglinfo
|
||||
// looks in
|
||||
// /run/opengl-driver/share/glvnd/egl_vendor.d
|
||||
// /etc/glvnd/egl_vendor.d
|
||||
// /usr/share/glvnd/egl_vendor.d
|
||||
//
|
||||
// these tell EGL which vendor libraries to load (mesa | nvidia)
|
||||
|
||||
// create window
|
||||
GLFWwindow * window = glfwCreateWindow(800, 600, "simple opengl triangle", NULL, NULL);
|
||||
|
||||
if (!window) {
|
||||
// getting error couldn't find framebuffer configuration matching requested
|
||||
// opengl context. used by GLX (opengl extension to x11).
|
||||
// defines things like: color depth, double buffering, stencil bits etc.
|
||||
|
||||
|
||||
const char * descr = nullptr;
|
||||
int code = glfwGetError(&descr);
|
||||
std::cerr << "glfwCreateWindow failed :code " << code << " :msg "
|
||||
<< (descr ? descr : "?unknown")
|
||||
<< std::endl;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef NOPE
|
||||
|
||||
if (SDL_Init(SDL_INIT_VIDEO
|
||||
| SDL_INIT_TIMER
|
||||
| SDL_INIT_GAMECONTROLLER) != 0)
|
||||
{
|
||||
std::cerr << "SDL_Init failed: " << SDL_GetError() << std::endl;
|
||||
return -1;
|
||||
}
|
||||
|
||||
// OpenGL attributes
|
||||
SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
|
||||
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
|
||||
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
|
||||
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
|
||||
|
||||
// SDL window
|
||||
SDL_Window * window
|
||||
= SDL_CreateWindow("xo imgui ex1",
|
||||
SDL_WINDOWPOS_CENTERED,
|
||||
SDL_WINDOWPOS_CENTERED,
|
||||
800 /*width ?*/,
|
||||
600 /*height ?*/,
|
||||
SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
|
||||
|
||||
SDL_GLContext gl_context = SDL_GLContext(window);
|
||||
SDL_GL_MakeCurrent(window, gl_context);
|
||||
SDL_GL_SetSwapInterval(1); // enable vsync.. (wut!?)
|
||||
|
||||
// imgui
|
||||
|
||||
IMGUI_CHECKVERSION();
|
||||
ImGui::CreateContext();
|
||||
ImGuiIO & io = ImGui::GetIO(); (void)io;
|
||||
|
||||
ImGui::StyleColorsDark();
|
||||
ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
|
||||
#endif
|
||||
|
||||
#ifdef NOPE
|
||||
// this gets: Failed to initialize OpenGL loader!
|
||||
ImGui_ImplOpenGL3_Init("#version 330");
|
||||
#endif
|
||||
}
|
||||
|
||||
/* imgui_ex1.cpp */
|
||||
Loading…
Add table
Add a link
Reference in a new issue