Class WindowSdl

imgui-app/src/main/java/imgui/app/WindowSdl.java:51–188

SDL3 + SDL_GPU implementation of Window. Pumps SDL events through ImGuiImplSdl3#processEvent(long) each frame, acquires an SDL_GPU swapchain texture, and submits a clear-load render pass through ImGuiImplSdlGpu3#prepareDrawData(long, long) + {@link ImGuiImplSdlGpu

 * (skipped per task scope).
 */
public class WindowSdl extends Window {
    private final ImGuiImplSdl3 imGuiSdl3 = new ImGuiImplSdl3();
    private final ImGuiImplSdlGpu3 imGuiSdlGpu3 = new ImGuiImplSdlGpu3();

    private long handle;
    private long gpuDevice;
    private boolean shouldClose;

    @Override
    protected void init(final Configuration config) {
        if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMEPAD)) {
            throw new IllegalStateException("Unable to initialize SDL3: " + SDL_GetError());
        }

        final long flags = SDL_WINDOW_HIGH_PIXEL_DENSITY | SDL_WINDOW_RESIZABLE;
        handle = SDL_CreateWindow(config.getTitle(), config.getWidth(), config.getHeight(), flags);
        if (handle == 0L) {
            throw new RuntimeException("Failed to create the SDL window: " + SDL_GetError());
        }
        if (config.isFullScreen()) {
            SDL_MaximizeWindow(handle);
        }

        // Create SDL_GPU device matching whatever shader format we ship.
        final int shaderFormats = SDL_GPU_SHADERFORMAT_SPIRV | SDL_GPU_SHADERFORMAT_DXBC | SDL_GPU_SHADERFORMAT_METALLIB;
        gpuDevice = SDL_CreateGPUDevice(shaderFormats, false, (java.nio.ByteBuffer) null);
        if (gpuDevice == 0L) {
            throw new RuntimeException("Failed to create the SDL_GPU device: " + SDL_GetError());
        }
        if (!SDL_ClaimWindowForGPUDevice(gpuDevice, handle)) {
            throw new RuntimeException("Failed to claim window for SDL_GPU device: " + SDL_GetError());
        }

        owner.initImGui(config);

        imGuiSdl3.initForSDLGPU(handle);

        final ImGuiImplSdlGpu3.InitInfo initInfo = new ImGuiImplSdlGpu3.InitInfo()
                .setDevice(gpuDevice)
                .setColorTargetFormat(SDL_GetGPUSwapchainTextureFormat(gpuDevice, handle));
        imGuiSdlGpu3.init(initInfo);
    }

    @Override
    protected void dispose() {
        imGuiSdlGpu3.shutdown();
        imGuiSdl3.shutdown();
        owner.disposeImGui();

        if (gpuDevice != 0L && handle != 0L) {
            SDL_ReleaseWindowFromGPUDevice(gpuDevice, handle);
        }
        if (gpuDevice != 0L) {
            SDL_DestroyGPUDevice(gpuDevice);
            gpuDevice = 0L;
        }
        if (handle != 0L) {
            SDL_DestroyWindow(handle);