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Introduce a Java 1:1 port of Dear ImGui's SDL3 platform backend. This backend supports single-viewport rendering and event forwarding for SDL3 (mouse, keyboard, gamepads). Includes helpers for gamepad mode management, mouse capture, and clipboard integration. Mirrors upstream lifecycle and event handling methods (`init`, `shutdown`, `processEvent`, `newFrame`) while omitting elements requiring C function pointers (e.g., IME callbacks, multi-viewport support).
…ions Expand the README to include information on the new SDL3 + SDL_GPU backend for `imgui-app`, configuration example, and instructions for running the smoke test using `MainSdl`. Adjust `example/build.gradle` to support dynamic main class selection via `-PmainClass`.
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Introduce a Java 1:1 port of Dear ImGui's SDL3 platform backend. This backend supports single-viewport rendering and event forwarding for SDL3 (mouse, keyboard, gamepads). Includes helpers for gamepad mode management, mouse capture, and clipboard integration. Mirrors upstream lifecycle and event handling methods (
init,shutdown,processEvent,newFrame) while omitting elements requiring C function pointers (e.g., IME callbacks, multi-viewport support).Multi-viewport support will be introduced in later commits.
closes #377
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