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https://github.com/libsdl-org/SDL.git
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121 lines
3.8 KiB
C
121 lines
3.8 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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#ifdef SDL_VIDEO_DRIVER_EMSCRIPTEN
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#include "SDL_emscriptenvideo.h"
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#include "SDL_emscriptenframebuffer.h"
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#include <emscripten/threading.h>
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bool Emscripten_CreateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, SDL_PixelFormat *format, void **pixels, int *pitch)
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{
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SDL_Surface *surface;
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const SDL_PixelFormat surface_format = SDL_PIXELFORMAT_RGBA32;
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int w, h;
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// Free the old framebuffer surface
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SDL_WindowData *data = window->internal;
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surface = data->surface;
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SDL_DestroySurface(surface);
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// Create a new one
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SDL_GetWindowSizeInPixels(window, &w, &h);
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surface = SDL_CreateSurface(w, h, surface_format);
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if (!surface) {
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return false;
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}
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// Save the info and return!
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data->surface = surface;
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*format = surface_format;
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*pixels = surface->pixels;
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*pitch = surface->pitch;
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return true;
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}
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bool Emscripten_UpdateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, const SDL_Rect *rects, int numrects)
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{
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SDL_Surface *surface;
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SDL_WindowData *data = window->internal;
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surface = data->surface;
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if (!surface) {
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return SDL_SetError("Couldn't find framebuffer surface for window");
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}
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// Send the data to the display
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/* *INDENT-OFF* */ // clang-format off
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MAIN_THREAD_EM_ASM({
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var w = $0;
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var h = $1;
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var pixels = $2;
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var canvasId = UTF8ToString($3);
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var canvas = document.querySelector(canvasId);
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//TODO: this should store a context per canvas
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if (!Module['SDL3']) Module['SDL3'] = {};
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var SDL3 = Module['SDL3'];
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if (SDL3.ctxCanvas !== canvas) {
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SDL3.ctx = Browser.createContext(canvas, false, true);
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SDL3.ctxCanvas = canvas;
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}
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if (SDL3.w !== w || SDL3.h !== h || SDL3.imageCtx !== SDL3.ctx) {
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SDL3.image = SDL3.ctx.createImageData(w, h);
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SDL3.w = w;
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SDL3.h = h;
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SDL3.imageCtx = SDL3.ctx;
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}
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var data = SDL3.image.data;
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var src = pixels / 4;
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if (SDL3.data32Data !== data) {
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SDL3.data32 = new Int32Array(data.buffer);
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SDL3.data32Data = data;
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}
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var data32 = SDL3.data32;
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data32.set(HEAP32.subarray(src, src + data32.length));
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SDL3.ctx.putImageData(SDL3.image, 0, 0);
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}, surface->w, surface->h, surface->pixels, data->canvas_id);
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/* *INDENT-ON* */ // clang-format on
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if (emscripten_has_asyncify() && SDL_GetHintBoolean(SDL_HINT_EMSCRIPTEN_ASYNCIFY, true)) {
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// give back control to browser for screen refresh
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emscripten_sleep(0);
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}
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return true;
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}
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void Emscripten_DestroyWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window)
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{
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SDL_WindowData *data = window->internal;
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SDL_DestroySurface(data->surface);
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data->surface = NULL;
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}
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#endif // SDL_VIDEO_DRIVER_EMSCRIPTEN
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