| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "SDL_internal.h" |
| |
| #ifdef SDL_VIDEO_DRIVER_EMSCRIPTEN |
| |
| #include <emscripten/emscripten.h> |
| #include <emscripten/html5.h> |
| #include <emscripten/threading.h> |
| |
| #include "SDL_emscriptenmouse.h" |
| #include "SDL_emscriptenvideo.h" |
| |
| #include "../SDL_video_c.h" |
| #include "../../events/SDL_mouse_c.h" |
| |
| /* older Emscriptens don't have this, but we need to for wasm64 compatibility. */ |
| #ifndef MAIN_THREAD_EM_ASM_PTR |
| #ifdef __wasm64__ |
| #error You need to upgrade your Emscripten compiler to support wasm64 |
| #else |
| #define MAIN_THREAD_EM_ASM_PTR MAIN_THREAD_EM_ASM_INT |
| #endif |
| #endif |
| |
| static SDL_Cursor *Emscripten_CreateCursorFromString(const char *cursor_str, SDL_bool is_custom) |
| { |
| Emscripten_CursorData *curdata; |
| SDL_Cursor *cursor = SDL_calloc(1, sizeof(SDL_Cursor)); |
| if (cursor) { |
| curdata = (Emscripten_CursorData *)SDL_calloc(1, sizeof(*curdata)); |
| if (!curdata) { |
| SDL_free(cursor); |
| return NULL; |
| } |
| |
| curdata->system_cursor = cursor_str; |
| curdata->is_custom = is_custom; |
| cursor->driverdata = curdata; |
| } |
| |
| return cursor; |
| } |
| |
| static SDL_Cursor *Emscripten_CreateDefaultCursor() |
| { |
| return Emscripten_CreateCursorFromString("default", SDL_FALSE); |
| } |
| |
| EM_JS_DEPS(sdlmouse, "$stringToUTF8,$UTF8ToString"); |
| |
| static SDL_Cursor *Emscripten_CreateCursor(SDL_Surface *surface, int hot_x, int hot_y) |
| { |
| const char *cursor_url = NULL; |
| SDL_Surface *conv_surf; |
| |
| conv_surf = SDL_ConvertSurfaceFormat(surface, SDL_PIXELFORMAT_ABGR8888); |
| |
| if (!conv_surf) { |
| return NULL; |
| } |
| |
| /* *INDENT-OFF* */ /* clang-format off */ |
| cursor_url = (const char *)MAIN_THREAD_EM_ASM_PTR({ |
| var w = $0; |
| var h = $1; |
| var hot_x = $2; |
| var hot_y = $3; |
| var pixels = $4; |
| |
| var canvas = document.createElement("canvas"); |
| canvas.width = w; |
| canvas.height = h; |
| |
| var ctx = canvas.getContext("2d"); |
| |
| var image = ctx.createImageData(w, h); |
| var data = image.data; |
| var src = pixels >> 2; |
| |
| var data32 = new Int32Array(data.buffer); |
| data32.set(HEAP32.subarray(src, src + data32.length)); |
| |
| ctx.putImageData(image, 0, 0); |
| var url = hot_x === 0 && hot_y === 0 |
| ? "url(" + canvas.toDataURL() + "), auto" |
| : "url(" + canvas.toDataURL() + ") " + hot_x + " " + hot_y + ", auto"; |
| |
| var urlBuf = _malloc(url.length + 1); |
| stringToUTF8(url, urlBuf, url.length + 1); |
| |
| return urlBuf; |
| }, surface->w, surface->h, hot_x, hot_y, conv_surf->pixels); |
| /* *INDENT-ON* */ /* clang-format on */ |
| |
| SDL_DestroySurface(conv_surf); |
| |
| return Emscripten_CreateCursorFromString(cursor_url, SDL_TRUE); |
| } |
| |
| static SDL_Cursor *Emscripten_CreateSystemCursor(SDL_SystemCursor id) |
| { |
| const char *cursor_name = SDL_GetCSSCursorName(id, NULL); |
| |
| return Emscripten_CreateCursorFromString(cursor_name, SDL_FALSE); |
| } |
| |
| static void Emscripten_FreeCursor(SDL_Cursor *cursor) |
| { |
| Emscripten_CursorData *curdata; |
| if (cursor) { |
| curdata = (Emscripten_CursorData *)cursor->driverdata; |
| |
| if (curdata) { |
| if (curdata->is_custom) { |
| SDL_free((char *)curdata->system_cursor); |
| } |
| SDL_free(cursor->driverdata); |
| } |
| |
| SDL_free(cursor); |
| } |
| } |
| |
| static int Emscripten_ShowCursor(SDL_Cursor *cursor) |
| { |
| Emscripten_CursorData *curdata; |
| if (SDL_GetMouseFocus() != NULL) { |
| if (cursor && cursor->driverdata) { |
| curdata = (Emscripten_CursorData *)cursor->driverdata; |
| |
| if (curdata->system_cursor) { |
| /* *INDENT-OFF* */ /* clang-format off */ |
| MAIN_THREAD_EM_ASM({ |
| if (Module['canvas']) { |
| Module['canvas'].style['cursor'] = UTF8ToString($0); |
| } |
| }, curdata->system_cursor); |
| /* *INDENT-ON* */ /* clang-format on */ |
| } |
| } else { |
| /* *INDENT-OFF* */ /* clang-format off */ |
| MAIN_THREAD_EM_ASM( |
| if (Module['canvas']) { |
| Module['canvas'].style['cursor'] = 'none'; |
| } |
| ); |
| /* *INDENT-ON* */ /* clang-format on */ |
| } |
| } |
| return 0; |
| } |
| |
| static int Emscripten_SetRelativeMouseMode(SDL_bool enabled) |
| { |
| SDL_Window *window; |
| SDL_WindowData *window_data; |
| |
| /* TODO: pointer lock isn't actually enabled yet */ |
| if (enabled) { |
| window = SDL_GetMouseFocus(); |
| if (!window) { |
| return -1; |
| } |
| |
| window_data = window->driverdata; |
| |
| if (emscripten_request_pointerlock(window_data->canvas_id, 1) >= EMSCRIPTEN_RESULT_SUCCESS) { |
| return 0; |
| } |
| } else { |
| if (emscripten_exit_pointerlock() >= EMSCRIPTEN_RESULT_SUCCESS) { |
| return 0; |
| } |
| } |
| return -1; |
| } |
| |
| void Emscripten_InitMouse() |
| { |
| SDL_Mouse *mouse = SDL_GetMouse(); |
| |
| mouse->CreateCursor = Emscripten_CreateCursor; |
| mouse->ShowCursor = Emscripten_ShowCursor; |
| mouse->FreeCursor = Emscripten_FreeCursor; |
| mouse->CreateSystemCursor = Emscripten_CreateSystemCursor; |
| mouse->SetRelativeMouseMode = Emscripten_SetRelativeMouseMode; |
| |
| SDL_SetDefaultCursor(Emscripten_CreateDefaultCursor()); |
| } |
| |
| void Emscripten_FiniMouse() |
| { |
| } |
| |
| #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */ |