diff options
Diffstat (limited to 'source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenmouse.c')
| -rw-r--r-- | source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenmouse.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenmouse.c b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenmouse.c new file mode 100644 index 0000000..e120980 --- /dev/null +++ b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenmouse.c @@ -0,0 +1,275 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2018 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" + +#if SDL_VIDEO_DRIVER_EMSCRIPTEN + +#include <emscripten/emscripten.h> +#include <emscripten/html5.h> + +#include "SDL_emscriptenmouse.h" + +#include "../../events/SDL_mouse_c.h" +#include "SDL_assert.h" + +static SDL_Cursor* +Emscripten_CreateCursorFromString(const char* cursor_str, SDL_bool is_custom) +{ + SDL_Cursor* cursor; + Emscripten_CursorData *curdata; + + cursor = SDL_calloc(1, sizeof(SDL_Cursor)); + if (cursor) { + curdata = (Emscripten_CursorData *) SDL_calloc(1, sizeof(*curdata)); + if (!curdata) { + SDL_OutOfMemory(); + SDL_free(cursor); + return NULL; + } + + curdata->system_cursor = cursor_str; + curdata->is_custom = is_custom; + cursor->driverdata = curdata; + } + else { + SDL_OutOfMemory(); + } + + return cursor; +} + +static SDL_Cursor* +Emscripten_CreateDefaultCursor() +{ + return Emscripten_CreateCursorFromString("default", SDL_FALSE); +} + +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, 0); + + if (!conv_surf) { + return NULL; + } + + cursor_url = (const char *)EM_ASM_INT({ + 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 dst = 0; + var num; + if (typeof CanvasPixelArray !== 'undefined' && data instanceof CanvasPixelArray) { + // IE10/IE11: ImageData objects are backed by the deprecated CanvasPixelArray, + // not UInt8ClampedArray. These don't have buffers, so we need to revert + // to copying a byte at a time. We do the undefined check because modern + // browsers do not define CanvasPixelArray anymore. + num = data.length; + while (dst < num) { + var val = HEAP32[src]; // This is optimized. Instead, we could do {{{ makeGetValue('buffer', 'dst', 'i32') }}}; + data[dst ] = val & 0xff; + data[dst+1] = (val >> 8) & 0xff; + data[dst+2] = (val >> 16) & 0xff; + data[dst+3] = (val >> 24) & 0xff; + src++; + dst += 4; + } + } else { + var data32 = new Int32Array(data.buffer); + num = data32.length; + data32.set(HEAP32.subarray(src, src + num)); + } + + 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); + + SDL_FreeSurface(conv_surf); + + return Emscripten_CreateCursorFromString(cursor_url, SDL_TRUE); +} + +static SDL_Cursor* +Emscripten_CreateSystemCursor(SDL_SystemCursor id) +{ + const char *cursor_name = NULL; + + switch(id) { + case SDL_SYSTEM_CURSOR_ARROW: + cursor_name = "default"; + break; + case SDL_SYSTEM_CURSOR_IBEAM: + cursor_name = "text"; + break; + case SDL_SYSTEM_CURSOR_WAIT: + cursor_name = "wait"; + break; + case SDL_SYSTEM_CURSOR_CROSSHAIR: + cursor_name = "crosshair"; + break; + case SDL_SYSTEM_CURSOR_WAITARROW: + cursor_name = "progress"; + break; + case SDL_SYSTEM_CURSOR_SIZENWSE: + cursor_name = "nwse-resize"; + break; + case SDL_SYSTEM_CURSOR_SIZENESW: + cursor_name = "nesw-resize"; + break; + case SDL_SYSTEM_CURSOR_SIZEWE: + cursor_name = "ew-resize"; + break; + case SDL_SYSTEM_CURSOR_SIZENS: + cursor_name = "ns-resize"; + break; + case SDL_SYSTEM_CURSOR_SIZEALL: + cursor_name = "move"; + break; + case SDL_SYSTEM_CURSOR_NO: + cursor_name = "not-allowed"; + break; + case SDL_SYSTEM_CURSOR_HAND: + cursor_name = "pointer"; + break; + default: + SDL_assert(0); + return 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 != NULL) { + 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) { + EM_ASM_INT({ + if (Module['canvas']) { + Module['canvas'].style['cursor'] = Module['Pointer_stringify']($0); + } + return 0; + }, curdata->system_cursor); + } + } + else { + EM_ASM( + if (Module['canvas']) { + Module['canvas'].style['cursor'] = 'none'; + } + ); + } + } + return 0; +} + +static void +Emscripten_WarpMouse(SDL_Window* window, int x, int y) +{ + SDL_Unsupported(); +} + +static int +Emscripten_SetRelativeMouseMode(SDL_bool enabled) +{ + /* TODO: pointer lock isn't actually enabled yet */ + if(enabled) { + if(emscripten_request_pointerlock(NULL, 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->WarpMouse = Emscripten_WarpMouse; + mouse->CreateSystemCursor = Emscripten_CreateSystemCursor; + mouse->SetRelativeMouseMode = Emscripten_SetRelativeMouseMode; + + SDL_SetDefaultCursor(Emscripten_CreateDefaultCursor()); +} + +void +Emscripten_FiniMouse() +{ +} + +#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */ + +/* vi: set ts=4 sw=4 expandtab: */ + |