diff options
Diffstat (limited to '3rdparty/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.c')
-rw-r--r-- | 3rdparty/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/3rdparty/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.c b/3rdparty/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.c new file mode 100644 index 00000000000..a26e23ae651 --- /dev/null +++ b/3rdparty/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.c @@ -0,0 +1,136 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2016 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 "SDL_emscriptenvideo.h" +#include "SDL_emscriptenframebuffer.h" + + +int Emscripten_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch) +{ + SDL_Surface *surface; + const Uint32 surface_format = SDL_PIXELFORMAT_BGR888; + int w, h; + int bpp; + Uint32 Rmask, Gmask, Bmask, Amask; + + /* Free the old framebuffer surface */ + SDL_WindowData *data = (SDL_WindowData *) window->driverdata; + surface = data->surface; + SDL_FreeSurface(surface); + + /* Create a new one */ + SDL_PixelFormatEnumToMasks(surface_format, &bpp, &Rmask, &Gmask, &Bmask, &Amask); + SDL_GetWindowSize(window, &w, &h); + + surface = SDL_CreateRGBSurface(0, w, h, bpp, Rmask, Gmask, Bmask, Amask); + 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(_THIS, SDL_Window * window, const SDL_Rect * rects, int numrects) +{ + SDL_Surface *surface; + + SDL_WindowData *data = (SDL_WindowData *) window->driverdata; + surface = data->surface; + if (!surface) { + return SDL_SetError("Couldn't find framebuffer surface for window"); + } + + /* Send the data to the display */ + + EM_ASM_INT({ + //TODO: don't create context every update + var ctx = Module['canvas'].getContext('2d'); + + //library_sdl.js SDL_UnlockSurface + var image = ctx.createImageData($0, $1); + var data = image.data; + var src = $2 >> 2; + var dst = 0; + var isScreen = true; + 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] = isScreen ? 0xff : ((val >> 24) & 0xff); + src++; + dst += 4; + } + } else { + var data32 = new Uint32Array(data.buffer); + num = data32.length; + if (isScreen) { + while (dst < num) { + // HEAP32[src++] is an optimization. Instead, we could do {{{ makeGetValue('buffer', 'dst', 'i32') }}}; + data32[dst++] = HEAP32[src++] | 0xff000000; + } + } else { + while (dst < num) { + data32[dst++] = HEAP32[src++]; + } + } + } + + ctx.putImageData(image, 0, 0); + return 0; + }, surface->w, surface->h, surface->pixels); + + /*if (SDL_getenv("SDL_VIDEO_Emscripten_SAVE_FRAMES")) { + static int frame_number = 0; + char file[128]; + SDL_snprintf(file, sizeof(file), "SDL_window%d-%8.8d.bmp", + SDL_GetWindowID(window), ++frame_number); + SDL_SaveBMP(surface, file); + }*/ + return 0; +} + +void Emscripten_DestroyWindowFramebuffer(_THIS, SDL_Window * window) +{ + SDL_WindowData *data = (SDL_WindowData *) window->driverdata; + + SDL_FreeSurface(data->surface); + data->surface = NULL; +} + +#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */ + +/* vi: set ts=4 sw=4 expandtab: */ |