SDL_emscriptenframebuffer.c
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/*
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: */
dst
GLenum GLenum dst
Definition: SDL_opengl_glext.h:1737
format
GLint GLint GLsizei GLsizei GLsizei GLint GLenum format
Definition: SDL_opengl.h:1565
num
GLuint num
Definition: SDL_opengl_glext.h:4956
Uint32
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:157
image
GLeglImageOES image
Definition: SDL_opengl.h:2141
SDL_emscriptenvideo.h
SDL_Surface::h
int h
Definition: SDL_surface.h:73
window
SDL_Window * window
Definition: testautomation_render.c:26
SDL_Surface
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
data
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1967
pixels
GLint GLint GLsizei GLsizei GLsizei GLint GLenum GLenum const GLvoid * pixels
Definition: SDL_opengl.h:1565
Emscripten_DestroyWindowFramebuffer
void Emscripten_DestroyWindowFramebuffer(_THIS, SDL_Window *window)
SDL_Surface::w
int w
Definition: SDL_surface.h:73
SDL_WindowData::surface
SDL_Surface * surface
Definition: SDL_emscriptenvideo.h:38
SDL_PIXELFORMAT_BGR888
Definition: SDL_pixels.h:241
SDL_WindowData
Definition: SDL_androidwindow.h:34
SDL_GetWindowSize
#define SDL_GetWindowSize
Definition: SDL_dynapi_overrides.h:531
Emscripten_CreateWindowFramebuffer
int Emscripten_CreateWindowFramebuffer(_THIS, SDL_Window *window, Uint32 *format, void **pixels, int *pitch)
val
GLuint GLfloat * val
Definition: SDL_opengl_glext.h:1492
SDL_Surface::pixels
void * pixels
Definition: SDL_surface.h:75
SDL_FreeSurface
#define SDL_FreeSurface
Definition: SDL_dynapi_overrides.h:450
_THIS
#define _THIS
Definition: SDL_alsa_audio.h:31
SDL_PixelFormatEnumToMasks
#define SDL_PixelFormatEnumToMasks
Definition: SDL_dynapi_overrides.h:284
NULL
#define NULL
Definition: begin_code.h:143
SDL_SetError
#define SDL_SetError
Definition: SDL_dynapi_overrides.h:36
SDL_CreateRGBSurface
#define SDL_CreateRGBSurface
Definition: SDL_dynapi_overrides.h:448
SDL_emscriptenframebuffer.h
SDL_Window
The type used to identify a window.
Definition: SDL_sysvideo.h:71
rects
SDL_Rect rects[MAX_RECTS]
Definition: testintersections.c:129
SDL_Surface::pitch
int pitch
Definition: SDL_surface.h:74
w
GLubyte GLubyte GLubyte GLubyte w
Definition: SDL_opengl_glext.h:731
SDL_Window::driverdata
void * driverdata
Definition: SDL_sysvideo.h:106
Emscripten_UpdateWindowFramebuffer
int Emscripten_UpdateWindowFramebuffer(_THIS, SDL_Window *window, const SDL_Rect *rects, int numrects)
src
GLenum src
Definition: SDL_opengl_glext.h:1737
h
GLfloat GLfloat GLfloat GLfloat h
Definition: SDL_opengl_glext.h:1946
SDL_Rect
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64