| /* |
| 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 "SDL_emscriptenvideo.h" |
| #include "SDL_emscriptenframebuffer.h" |
| |
| #include <emscripten/threading.h> |
| |
| int Emscripten_CreateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, SDL_PixelFormatEnum *format, void **pixels, int *pitch) |
| { |
| SDL_Surface *surface; |
| const SDL_PixelFormatEnum surface_format = SDL_PIXELFORMAT_XBGR8888; |
| int w, h; |
| |
| /* Free the old framebuffer surface */ |
| SDL_WindowData *data = window->driverdata; |
| surface = data->surface; |
| SDL_DestroySurface(surface); |
| |
| /* Create a new one */ |
| SDL_GetWindowSizeInPixels(window, &w, &h); |
| |
| surface = SDL_CreateSurface(w, h, surface_format); |
| if (!surface) { |
| return -1; |
| } |
| |
| /* Save the info and return! */ |
| data->surface = surface; |
| *format = surface_format; |
| *pixels = surface->pixels; |
| *pitch = surface->pitch; |
| return 0; |
| } |
| |
| int Emscripten_UpdateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, const SDL_Rect *rects, int numrects) |
| { |
| SDL_Surface *surface; |
| |
| SDL_WindowData *data = window->driverdata; |
| surface = data->surface; |
| if (!surface) { |
| return SDL_SetError("Couldn't find framebuffer surface for window"); |
| } |
| |
| /* Send the data to the display */ |
| |
| /* *INDENT-OFF* */ /* clang-format off */ |
| MAIN_THREAD_EM_ASM({ |
| var w = $0; |
| var h = $1; |
| var pixels = $2; |
| var canvasId = UTF8ToString($3); |
| var canvas = document.querySelector(canvasId); |
| |
| //TODO: this should store a context per canvas |
| if (!Module['SDL3']) Module['SDL3'] = {}; |
| var SDL3 = Module['SDL3']; |
| if (SDL3.ctxCanvas !== canvas) { |
| SDL3.ctx = Module['createContext'](canvas, false, true); |
| SDL3.ctxCanvas = canvas; |
| } |
| if (SDL3.w !== w || SDL3.h !== h || SDL3.imageCtx !== SDL3.ctx) { |
| SDL3.image = SDL3.ctx.createImageData(w, h); |
| SDL3.w = w; |
| SDL3.h = h; |
| SDL3.imageCtx = SDL3.ctx; |
| } |
| var data = SDL3.image.data; |
| var src = pixels >> 2; |
| var dst = 0; |
| var num; |
| |
| if (SDL3.data32Data !== data) { |
| SDL3.data32 = new Int32Array(data.buffer); |
| SDL3.data8 = new Uint8Array(data.buffer); |
| SDL3.data32Data = data; |
| } |
| var data32 = SDL3.data32; |
| num = data32.length; |
| // logically we need to do |
| // while (dst < num) { |
| // data32[dst++] = HEAP32[src++] | 0xff000000 |
| // } |
| // the following code is faster though, because |
| // .set() is almost free - easily 10x faster due to |
| // native SDL_memcpy efficiencies, and the remaining loop |
| // just stores, not load + store, so it is faster |
| data32.set(HEAP32.subarray(src, src + num)); |
| var data8 = SDL3.data8; |
| var i = 3; |
| var j = i + 4*num; |
| if (num % 8 == 0) { |
| // unrolling gives big speedups |
| while (i < j) { |
| data8[i] = 0xff; |
| i = i + 4 | 0; |
| data8[i] = 0xff; |
| i = i + 4 | 0; |
| data8[i] = 0xff; |
| i = i + 4 | 0; |
| data8[i] = 0xff; |
| i = i + 4 | 0; |
| data8[i] = 0xff; |
| i = i + 4 | 0; |
| data8[i] = 0xff; |
| i = i + 4 | 0; |
| data8[i] = 0xff; |
| i = i + 4 | 0; |
| data8[i] = 0xff; |
| i = i + 4 | 0; |
| } |
| } else { |
| while (i < j) { |
| data8[i] = 0xff; |
| i = i + 4 | 0; |
| } |
| } |
| |
| SDL3.ctx.putImageData(SDL3.image, 0, 0); |
| }, surface->w, surface->h, surface->pixels, data->canvas_id); |
| /* *INDENT-ON* */ /* clang-format on */ |
| |
| if (emscripten_has_asyncify() && SDL_GetHintBoolean(SDL_HINT_EMSCRIPTEN_ASYNCIFY, SDL_TRUE)) { |
| /* give back control to browser for screen refresh */ |
| emscripten_sleep(0); |
| } |
| |
| return 0; |
| } |
| |
| void Emscripten_DestroyWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window) |
| { |
| SDL_WindowData *data = window->driverdata; |
| |
| SDL_DestroySurface(data->surface); |
| data->surface = NULL; |
| } |
| |
| #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */ |