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/**
* @file gui.cpp
* @brief Contains code for GUI-related logic.
*
* Copyright (C) 2021 Clyne Sullivan
*
* Distributed under the GNU GPL v3 or later. You should have received a copy of
* the GNU General Public License along with this program.
* If not, see <https://www.gnu.org/licenses/>.
*/
#include "imgui.h"
#include "backends/imgui_impl_sdl.h"
#include "backends/imgui_impl_opengl2.h"
#include "config.h"
#include <SDL2/SDL.h>
#include <SDL2/SDL_opengl.h>
ImFont *fontSans = nullptr;
ImFont *fontMono = nullptr;
static ImGuiIO *io = nullptr;
static SDL_Window *window = nullptr;
static decltype(SDL_GL_CreateContext(nullptr)) gl_context;
bool guiInitialize()
{
if (SDL_Init(SDL_INIT_VIDEO) != 0) {
printf("Error: %s\n", SDL_GetError());
return false;
}
// Setup window
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
window = SDL_CreateWindow("stmdsp gui",
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
WINDOW_WIDTH, WINDOW_HEIGHT,
SDL_WINDOW_OPENGL /*| SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI*/);
gl_context = SDL_GL_CreateContext(window);
SDL_GL_MakeCurrent(window, gl_context);
SDL_GL_SetSwapInterval(1); // Enable vsync
// Setup Dear ImGui context
IMGUI_CHECKVERSION();
ImGui::CreateContext();
io = &ImGui::GetIO();
io->ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
fontSans = io->Fonts->AddFontFromFileTTF("fonts/Roboto-Regular.ttf", 20);
fontMono = io->Fonts->AddFontFromFileTTF("fonts/RobotoMono-Regular.ttf", 20);
ImGui::StyleColorsLight();
ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
ImGui_ImplOpenGL2_Init();
return true;
}
void guiRender(void (*func)())
{
glViewport(0, 0, (int)io->DisplaySize.x, (int)io->DisplaySize.y);
glClearColor(1, 1, 1, 1);
glClear(GL_COLOR_BUFFER_BIT);
func();
SDL_GL_SwapWindow(window);
}
void guiHandleEvents(bool& done)
{
SDL_Event event;
for (SDL_Event event; 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;
}
}
void guiShutdown()
{
ImGui_ImplOpenGL2_Shutdown();
ImGui_ImplSDL2_Shutdown();
ImGui::DestroyContext();
SDL_GL_DeleteContext(gl_context);
SDL_DestroyWindow(window);
SDL_Quit();
}
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