/*

Simple DirectMedia Layer

Copyright (C) 1997-2019 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_video.h"

#include "SDL_mouse.h"

#include "SDL_hints.h"

#include "../SDL_sysvideo.h"

#include "../SDL_pixels_c.h"

#include "../SDL_egl_c.h"

#include "../../events/SDL_events_c.h"

#include "SDL_emscriptenvideo.h"

#include "SDL_emscriptenopengles.h"

#include "SDL_emscriptenframebuffer.h"

#include "SDL_emscriptenevents.h"

#include "SDL_emscriptenmouse.h"

#define EMSCRIPTENVID_DRIVER_NAME "emscripten"

/* Initialization/Query functions */

static int Emscripten_VideoInit(_THIS);

static int Emscripten_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);

static void Emscripten_VideoQuit(_THIS);

static int Emscripten_CreateWindow(_THIS, SDL_Window * window);

static void Emscripten_SetWindowSize(_THIS, SDL_Window * window);

static void Emscripten_DestroyWindow(_THIS, SDL_Window * window);

static void Emscripten_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen);

static void Emscripten_PumpEvents(_THIS);

static void Emscripten_SetWindowTitle(_THIS, SDL_Window * window);

/* Emscripten driver bootstrap functions */

static int

Emscripten_Available(void)

{

return (1);

}

static void

Emscripten_DeleteDevice(SDL_VideoDevice * device)

{

SDL_free(device);

}

static SDL_VideoDevice *

Emscripten_CreateDevice(int devindex)

{

SDL_VideoDevice *device;

/* Initialize all variables that we clean on shutdown */

device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));

if (!device) {

SDL_OutOfMemory();

return (0);

}

/* Firefox sends blur event which would otherwise prevent full screen

* when the user clicks to allow full screen.

* See https://bugzilla.mozilla.org/show_bug.cgi?id=1144964

*/

SDL_SetHint(SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS, "0");

/* Set the function pointers */

device->VideoInit = Emscripten_VideoInit;

device->VideoQuit = Emscripten_VideoQuit;

device->SetDisplayMode = Emscripten_SetDisplayMode;

device->PumpEvents = Emscripten_PumpEvents;

device->CreateSDLWindow = Emscripten_CreateWindow;

device->SetWindowTitle = Emscripten_SetWindowTitle;

/*device->SetWindowIcon = Emscripten_SetWindowIcon;

device->SetWindowPosition = Emscripten_SetWindowPosition;*/

device->SetWindowSize = Emscripten_SetWindowSize;

/*device->ShowWindow = Emscripten_ShowWindow;

device->HideWindow = Emscripten_HideWindow;

device->RaiseWindow = Emscripten_RaiseWindow;

device->MaximizeWindow = Emscripten_MaximizeWindow;

device->MinimizeWindow = Emscripten_MinimizeWindow;

device->RestoreWindow = Emscripten_RestoreWindow;

device->SetWindowGrab = Emscripten_SetWindowGrab;*/

device->DestroyWindow = Emscripten_DestroyWindow;

device->SetWindowFullscreen = Emscripten_SetWindowFullscreen;

device->CreateWindowFramebuffer = Emscripten_CreateWindowFramebuffer;

device->UpdateWindowFramebuffer = Emscripten_UpdateWindowFramebuffer;

device->DestroyWindowFramebuffer = Emscripten_DestroyWindowFramebuffer;

#if SDL_VIDEO_OPENGL_EGL

device->GL_LoadLibrary = Emscripten_GLES_LoadLibrary;

device->GL_GetProcAddress = Emscripten_GLES_GetProcAddress;

device->GL_UnloadLibrary = Emscripten_GLES_UnloadLibrary;

device->GL_CreateContext = Emscripten_GLES_CreateContext;

device->GL_MakeCurrent = Emscripten_GLES_MakeCurrent;

device->GL_SetSwapInterval = Emscripten_GLES_SetSwapInterval;

device->GL_GetSwapInterval = Emscripten_GLES_GetSwapInterval;

device->GL_SwapWindow = Emscripten_GLES_SwapWindow;

device->GL_DeleteContext = Emscripten_GLES_DeleteContext;

device->GL_GetDrawableSize = Emscripten_GLES_GetDrawableSize;

#endif

device->free = Emscripten_DeleteDevice;

return device;

}

VideoBootStrap Emscripten_bootstrap = {

EMSCRIPTENVID_DRIVER_NAME, "SDL emscripten video driver",

Emscripten_Available, Emscripten_CreateDevice

};

int

Emscripten_VideoInit(_THIS)

{

SDL_DisplayMode mode;

/* Use a fake 32-bpp desktop mode */

mode.format = SDL_PIXELFORMAT_RGB888;

mode.w = EM_ASM_INT_V({

return screen.width;

});

mode.h = EM_ASM_INT_V({

return screen.height;

});

mode.refresh_rate = 0;

mode.driverdata = NULL;

if (SDL_AddBasicVideoDisplay(&mode) < 0) {

return -1;

}

SDL_zero(mode);

SDL_AddDisplayMode(&_this->displays[0], &mode);

Emscripten_InitMouse();

/* We're done! */

return 0;

}

static int

Emscripten_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)

{

/* can't do this */

return 0;

}

static void

Emscripten_VideoQuit(_THIS)

{

Emscripten_FiniMouse();

}

static void

Emscripten_PumpEvents(_THIS)

{

/* do nothing. */

}

static int

Emscripten_CreateWindow(_THIS, SDL_Window * window)

{

SDL_WindowData *wdata;

double scaled_w, scaled_h;

double css_w, css_h;

/* Allocate window internal data */

wdata = (SDL_WindowData *) SDL_calloc(1, sizeof(SDL_WindowData));

if (wdata == NULL) {

return SDL_OutOfMemory();

}

if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {

wdata->pixel_ratio = emscripten_get_device_pixel_ratio();

} else {

wdata->pixel_ratio = 1.0f;

}

scaled_w = SDL_floor(window->w * wdata->pixel_ratio);

scaled_h = SDL_floor(window->h * wdata->pixel_ratio);

/* set a fake size to check if there is any CSS sizing the canvas */

emscripten_set_canvas_element_size(NULL, 1, 1);

emscripten_get_element_css_size(NULL, &css_w, &css_h);

wdata->external_size = SDL_floor(css_w) != 1 || SDL_floor(css_h) != 1;

if ((window->flags & SDL_WINDOW_RESIZABLE) && wdata->external_size) {

/* external css has resized us */

scaled_w = css_w * wdata->pixel_ratio;

scaled_h = css_h * wdata->pixel_ratio;

SDL_SendWindowEvent(window, SDL_WINDOWEVENT_RESIZED, css_w, css_h);

}

emscripten_set_canvas_element_size(NULL, scaled_w, scaled_h);

/* if the size is not being controlled by css, we need to scale down for hidpi */

if (!wdata->external_size) {

if (wdata->pixel_ratio != 1.0f) {

/*scale canvas down*/

emscripten_set_element_css_size(NULL, window->w, window->h);

}

}

#if SDL_VIDEO_OPENGL_EGL

if (window->flags & SDL_WINDOW_OPENGL) {

if (!_this->egl_data) {

if (SDL_GL_LoadLibrary(NULL) < 0) {

return -1;

}

}

wdata->egl_surface = SDL_EGL_CreateSurface(_this, 0);

if (wdata->egl_surface == EGL_NO_SURFACE) {

return SDL_SetError("Could not create GLES window surface");

}

}

#endif

wdata->window = window;

/* Setup driver data for this window */

window->driverdata = wdata;

/* One window, it always has focus */

SDL_SetMouseFocus(window);

SDL_SetKeyboardFocus(window);

Emscripten_RegisterEventHandlers(wdata);

/* Window has been successfully created */

return 0;

}

static void Emscripten_SetWindowSize(_THIS, SDL_Window * window)

{

SDL_WindowData *data;

if (window->driverdata) {

data = (SDL_WindowData *) window->driverdata;

/* update pixel ratio */

if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {

data->pixel_ratio = emscripten_get_device_pixel_ratio();

}

emscripten_set_canvas_element_size(NULL, window->w * data->pixel_ratio, window->h * data->pixel_ratio);

/*scale canvas down*/

if (!data->external_size && data->pixel_ratio != 1.0f) {

emscripten_set_element_css_size(NULL, window->w, window->h);

}

}

}

static void

Emscripten_DestroyWindow(_THIS, SDL_Window * window)

{

SDL_WindowData *data;

if(window->driverdata) {

data = (SDL_WindowData *) window->driverdata;

Emscripten_UnregisterEventHandlers(data);

#if SDL_VIDEO_OPENGL_EGL

if (data->egl_surface != EGL_NO_SURFACE) {

SDL_EGL_DestroySurface(_this, data->egl_surface);

data->egl_surface = EGL_NO_SURFACE;

}

#endif

SDL_free(window->driverdata);

window->driverdata = NULL;

}

}

static void

Emscripten_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen)

{

SDL_WindowData *data;

if(window->driverdata) {

data = (SDL_WindowData *) window->driverdata;

if(fullscreen) {

EmscriptenFullscreenStrategy strategy;

SDL_bool is_desktop_fullscreen = (window->flags & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN_DESKTOP;

int res;

strategy.scaleMode = is_desktop_fullscreen ? EMSCRIPTEN_FULLSCREEN_SCALE_STRETCH : EMSCRIPTEN_FULLSCREEN_SCALE_ASPECT;

if(!is_desktop_fullscreen) {

strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_NONE;

} else if(window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {

strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_HIDEF;

} else {

strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_STDDEF;

}

strategy.filteringMode = EMSCRIPTEN_FULLSCREEN_FILTERING_DEFAULT;

strategy.canvasResizedCallback = Emscripten_HandleCanvasResize;

strategy.canvasResizedCallbackUserData = data;

data->requested_fullscreen_mode = window->flags & (SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN);

data->fullscreen_resize = is_desktop_fullscreen;

res = emscripten_request_fullscreen_strategy(NULL, 1, &strategy);

if(res != EMSCRIPTEN_RESULT_SUCCESS && res != EMSCRIPTEN_RESULT_DEFERRED) {

/* unset flags, fullscreen failed */

window->flags &= ~(SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN);

}

}

else

emscripten_exit_fullscreen();

}

}

static void

Emscripten_SetWindowTitle(_THIS, SDL_Window * window) {

EM_ASM_INT({

if (typeof Module['setWindowTitle'] !== 'undefined') {

Module['setWindowTitle'](Module['Pointer_stringify']($0));

}

return 0;

}, window->title);

}

#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */

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