A spinning cube rendered with dasVulkan, with a Dear ImGui control panel whose slider drives the rotation speed — and the ImGui UI is rasterized by a renderer backend written entirely in daslang (vulkan/vulkan_imgui_driver, now part of dasVulkan). No C++.

The point: a Dear ImGui renderer backend is just a draw-data replay driver. dasImgui exposes the whole ImDrawData surface to daslang (vertex/index buffers, draw commands, clip rects, the 1.92 texture queue), and dasVulkan exposes the GPU primitives, so the bridge is pure das.

Two opt-in modules ship with dasVulkan:

• vulkan/vulkan_imgui_driver — the 100%-daslang ImGui→Vulkan renderer backend (the bridge): pipeline, the 1.92 dynamic-texture queue, and the per-frame draw-data replay (upload vertices/indices, walk the draw commands, set the per-command scissor, bind the command's texture, indexed draw). Its vertex/fragment shaders are authored in daslang and lowered to SPIR-V by dasSpirv (the daslang equivalent of the stock imgui_impl_vulkan glsl), inlined into the module.
• vulkan/vulkan_live — daslang-live commands (screenshot / record / stats), the Vulkan mirror of opengl_live. It owns nothing: you hand it the device + swapchain once with vk_live_set_target, then vk_live_draw_frame(...) (a drop-in for draw_frame) renders and lets the live commands read the swapchain back.

• main.das — the app: the vulkan/vulkan_imgui_app harness owns the window/device/swapchain and wires the live stack; the cube draws in the harness_end_frame scene block (back-face culled, so a convex mesh needs no depth buffer), and the panel is imgui_boost_v2 (CUBE_WIN/SPEED).
• cube_shaders.das — the cube's lit shaders (dasSpirv), push-constant-only.

The example depends on two external modules — dasVulkan and dasImgui — declared in .das_package. Install them once with daspkg (clones + builds the native modules into modules/):

cd examples/vulkan_imgui_cube
daslang ../../utils/daspkg/main.das -- install

Then run it — drag the slider to change the spin speed, press P to save a screenshot (screenshot.png, captured by vulkan_live), close the window to exit:

daslang -project_root . main.das

The UI is imgui_boost_v2, so under daslang-live every widget is drivable:

daslang-live -project_root . main.das
curl -X POST -d '{"name":"imgui_force_set","args":{"target":"CUBE_WIN/SPEED","value":4.0}}' localhost:9090/command
curl -X POST -d '{"name":"imgui_snapshot"}' localhost:9090/command
curl -X POST -d '{"name":"screenshot","args":{"file":"shot.png"}}' localhost:9090/command