*misc

1 files changed, 178 insertions, 0 deletions

diff --git a/Source/external/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.c b/Source/external/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.c
new file mode 100644
index 0000000..bfdec3b
--- /dev/null
+++ b/Source/external/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.c
@@ -0,0 +1,178 @@
+/*
+  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 "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({
+        var w = $0;
+        var h = $1;
+        var pixels = $2;
+
+        if (!Module['SDL2']) Module['SDL2'] = {};
+        var SDL2 = Module['SDL2'];
+        if (SDL2.ctxCanvas !== Module['canvas']) {
+            SDL2.ctx = Module['createContext'](Module['canvas'], false, true);
+            SDL2.ctxCanvas = Module['canvas'];
+        }
+        if (SDL2.w !== w || SDL2.h !== h || SDL2.imageCtx !== SDL2.ctx) {
+            SDL2.image = SDL2.ctx.createImageData(w, h);
+            SDL2.w = w;
+            SDL2.h = h;
+            SDL2.imageCtx = SDL2.ctx;
+        }
+        var data = SDL2.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] = 0xff;
+                src++;
+                dst += 4;
+            }
+        } else {
+            if (SDL2.data32Data !== data) {
+                SDL2.data32 = new Int32Array(data.buffer);
+                SDL2.data8 = new Uint8Array(data.buffer);
+            }
+            var data32 = SDL2.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 memcpy efficiencies, and the remaining loop
+            // just stores, not load + store, so it is faster
+            data32.set(HEAP32.subarray(src, src + num));
+            var data8 = SDL2.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;
+                }
+            }
+        }
+
+        SDL2.ctx.putImageData(SDL2.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: */