src/video/raspberry/SDL_rpivideo.c - third_party/sdl - Git at Google

 /*
   Simple DirectMedia Layer
   Copyright (C) 1997-2021 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_RPI

 /* References
  * http://elinux.org/RPi_VideoCore_APIs
  * https://github.com/raspberrypi/firmware/blob/master/opt/vc/src/hello_pi/hello_triangle/triangle.c
  * http://cgit.freedesktop.org/wayland/weston/tree/src/rpi-renderer.c
  * http://cgit.freedesktop.org/wayland/weston/tree/src/compositor-rpi.c
  */

 /* SDL internals */
 #include "../SDL_sysvideo.h"
 #include "SDL_version.h"
 #include "SDL_syswm.h"
 #include "SDL_loadso.h"
 #include "SDL_events.h"
 #include "../../events/SDL_mouse_c.h"
 #include "../../events/SDL_keyboard_c.h"
 #include "SDL_hints.h"

 #ifdef SDL_INPUT_LINUXEV
 #include "../../core/linux/SDL_evdev.h"
 #endif

 /* RPI declarations */
 #include "SDL_rpivideo.h"
 #include "SDL_rpievents_c.h"
 #include "SDL_rpiopengles.h"
 #include "SDL_rpimouse.h"

 static void
 RPI_Destroy(SDL_VideoDevice * device)
 {
     SDL_free(device->driverdata);
     SDL_free(device);
 }

 static int
 RPI_GetRefreshRate()
 {
     TV_DISPLAY_STATE_T tvstate;
     if (vc_tv_get_display_state( &tvstate ) == 0) {
         //The width/height parameters are in the same position in the union
         //for HDMI and SDTV
         HDMI_PROPERTY_PARAM_T property;
         property.property = HDMI_PROPERTY_PIXEL_CLOCK_TYPE;
         vc_tv_hdmi_get_property(&property);
         return property.param1 == HDMI_PIXEL_CLOCK_TYPE_NTSC ?
             tvstate.display.hdmi.frame_rate * (1000.0f/1001.0f) :
             tvstate.display.hdmi.frame_rate;
     }
     return 60;  /* Failed to get display state, default to 60 */
 }

 static SDL_VideoDevice *
 RPI_Create()
 {
     SDL_VideoDevice *device;
     SDL_VideoData *phdata;

     /* Initialize SDL_VideoDevice structure */
     device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
     if (device == NULL) {
         SDL_OutOfMemory();
         return NULL;
     }

     /* Initialize internal data */
     phdata = (SDL_VideoData *) SDL_calloc(1, sizeof(SDL_VideoData));
     if (phdata == NULL) {
         SDL_OutOfMemory();
         SDL_free(device);
         return NULL;
     }

     device->driverdata = phdata;

     /* Setup amount of available displays */
     device->num_displays = 0;

     /* Set device free function */
     device->free = RPI_Destroy;

     /* Setup all functions which we can handle */
     device->VideoInit = RPI_VideoInit;
     device->VideoQuit = RPI_VideoQuit;
     device->GetDisplayModes = RPI_GetDisplayModes;
     device->SetDisplayMode = RPI_SetDisplayMode;
     device->CreateSDLWindow = RPI_CreateWindow;
     device->CreateSDLWindowFrom = RPI_CreateWindowFrom;
     device->SetWindowTitle = RPI_SetWindowTitle;
     device->SetWindowIcon = RPI_SetWindowIcon;
     device->SetWindowPosition = RPI_SetWindowPosition;
     device->SetWindowSize = RPI_SetWindowSize;
     device->ShowWindow = RPI_ShowWindow;
     device->HideWindow = RPI_HideWindow;
     device->RaiseWindow = RPI_RaiseWindow;
     device->MaximizeWindow = RPI_MaximizeWindow;
     device->MinimizeWindow = RPI_MinimizeWindow;
     device->RestoreWindow = RPI_RestoreWindow;
     device->DestroyWindow = RPI_DestroyWindow;
 #if 0
     device->GetWindowWMInfo = RPI_GetWindowWMInfo;
 #endif
     device->GL_LoadLibrary = RPI_GLES_LoadLibrary;
     device->GL_GetProcAddress = RPI_GLES_GetProcAddress;
     device->GL_UnloadLibrary = RPI_GLES_UnloadLibrary;
     device->GL_CreateContext = RPI_GLES_CreateContext;
     device->GL_MakeCurrent = RPI_GLES_MakeCurrent;
     device->GL_SetSwapInterval = RPI_GLES_SetSwapInterval;
     device->GL_GetSwapInterval = RPI_GLES_GetSwapInterval;
     device->GL_SwapWindow = RPI_GLES_SwapWindow;
     device->GL_DeleteContext = RPI_GLES_DeleteContext;
     device->GL_DefaultProfileConfig = RPI_GLES_DefaultProfileConfig;

     device->PumpEvents = RPI_PumpEvents;

     return device;
 }

 VideoBootStrap RPI_bootstrap = {
     "RPI",
     "RPI Video Driver",
     RPI_Create
 };


 /*****************************************************************************/
 /* SDL Video and Display initialization/handling functions                   */
 /*****************************************************************************/

 static void
 AddDispManXDisplay(const int display_id)
 {
     DISPMANX_MODEINFO_T modeinfo;
     DISPMANX_DISPLAY_HANDLE_T handle;
     SDL_VideoDisplay display;
     SDL_DisplayMode current_mode;
     SDL_DisplayData *data;

     handle = vc_dispmanx_display_open(display_id);
     if (!handle) {
         return;  /* this display isn't available */
     }

     if (vc_dispmanx_display_get_info(handle, &modeinfo) < 0) {
         vc_dispmanx_display_close(handle);
         return;
     }

     /* RPI_GetRefreshRate() doesn't distinguish between displays. I'm not sure the hardware distinguishes either */
     SDL_zero(current_mode);
     current_mode.w = modeinfo.width;
     current_mode.h = modeinfo.height;
     current_mode.refresh_rate = RPI_GetRefreshRate();
     /* 32 bpp for default */
     current_mode.format = SDL_PIXELFORMAT_ABGR8888;

     current_mode.driverdata = NULL;

     SDL_zero(display);
     display.desktop_mode = current_mode;
     display.current_mode = current_mode;

     /* Allocate display internal data */
     data = (SDL_DisplayData *) SDL_calloc(1, sizeof(SDL_DisplayData));
     if (data == NULL) {
         vc_dispmanx_display_close(handle);
         return;  /* oh well */
     }

     data->dispman_display = handle;

     display.driverdata = data;

     SDL_AddVideoDisplay(&display, SDL_FALSE);
 }

 int
 RPI_VideoInit(_THIS)
 {
     /* Initialize BCM Host */
     bcm_host_init();

     AddDispManXDisplay(DISPMANX_ID_MAIN_LCD);  /* your default display */
     AddDispManXDisplay(DISPMANX_ID_FORCE_OTHER);  /* an "other" display...maybe DSI-connected screen while HDMI is your main */

 #ifdef SDL_INPUT_LINUXEV
     if (SDL_EVDEV_Init() < 0) {
         return -1;
     }
 #endif

     RPI_InitMouse(_this);

     return 1;
 }

 void
 RPI_VideoQuit(_THIS)
 {
 #ifdef SDL_INPUT_LINUXEV
     SDL_EVDEV_Quit();
 #endif
 }

 void
 RPI_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
 {
     /* Only one display mode available, the current one */
     SDL_AddDisplayMode(display, &display->current_mode);
 }

 int
 RPI_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
 {
     return 0;
 }

 static void
 RPI_vsync_callback(DISPMANX_UPDATE_HANDLE_T u, void *data)
 {
    SDL_WindowData *wdata = ((SDL_WindowData *) data);

    SDL_LockMutex(wdata->vsync_cond_mutex);
    SDL_CondSignal(wdata->vsync_cond);
    SDL_UnlockMutex(wdata->vsync_cond_mutex);
 }

 int
 RPI_CreateWindow(_THIS, SDL_Window * window)
 {
     SDL_WindowData *wdata;
     SDL_VideoDisplay *display;
     SDL_DisplayData *displaydata;
     VC_RECT_T dst_rect;
     VC_RECT_T src_rect;
     VC_DISPMANX_ALPHA_T         dispman_alpha;
     DISPMANX_UPDATE_HANDLE_T dispman_update;
     uint32_t layer = SDL_RPI_VIDEOLAYER;
     const char *env;

     /* Disable alpha, otherwise the app looks composed with whatever dispman is showing (X11, console,etc) */
     dispman_alpha.flags = DISPMANX_FLAGS_ALPHA_FIXED_ALL_PIXELS;
     dispman_alpha.opacity = 0xFF;
     dispman_alpha.mask = 0;

     /* Allocate window internal data */
     wdata = (SDL_WindowData *) SDL_calloc(1, sizeof(SDL_WindowData));
     if (wdata == NULL) {
         return SDL_OutOfMemory();
     }
     display = SDL_GetDisplayForWindow(window);
     displaydata = (SDL_DisplayData *) display->driverdata;

     /* Windows have one size for now */
     window->w = display->desktop_mode.w;
     window->h = display->desktop_mode.h;

     /* OpenGL ES is the law here, buddy */
     window->flags |= SDL_WINDOW_OPENGL;

     /* Create a dispman element and associate a window to it */
     dst_rect.x = 0;
     dst_rect.y = 0;
     dst_rect.width = window->w;
     dst_rect.height = window->h;

     src_rect.x = 0;
     src_rect.y = 0;
     src_rect.width = window->w << 16;
     src_rect.height = window->h << 16;

     env = SDL_GetHint(SDL_HINT_RPI_VIDEO_LAYER);
     if (env) {
         layer = SDL_atoi(env);
     }

     dispman_update = vc_dispmanx_update_start( 0 );
     wdata->dispman_window.element = vc_dispmanx_element_add (dispman_update,
                                                              displaydata->dispman_display,
                                                              layer /* layer */,
                                                              &dst_rect,
                                                              0 /*src*/,
                                                              &src_rect,
                                                              DISPMANX_PROTECTION_NONE,
                                                              &dispman_alpha /*alpha*/,
                                                              0 /*clamp*/,
                                                              0 /*transform*/);
     wdata->dispman_window.width = window->w;
     wdata->dispman_window.height = window->h;
     vc_dispmanx_update_submit_sync(dispman_update);

     if (!_this->egl_data) {
         if (SDL_GL_LoadLibrary(NULL) < 0) {
             return -1;
         }
     }
     wdata->egl_surface = SDL_EGL_CreateSurface(_this, (NativeWindowType) &wdata->dispman_window);

     if (wdata->egl_surface == EGL_NO_SURFACE) {
         return SDL_SetError("Could not create GLES window surface");
     }

     /* Start generating vsync callbacks if necesary */
     wdata->double_buffer = SDL_FALSE;
     if (SDL_GetHintBoolean(SDL_HINT_VIDEO_DOUBLE_BUFFER, SDL_FALSE)) {
         wdata->vsync_cond = SDL_CreateCond();
         wdata->vsync_cond_mutex = SDL_CreateMutex();
         wdata->double_buffer = SDL_TRUE;
         vc_dispmanx_vsync_callback(displaydata->dispman_display, RPI_vsync_callback, (void*)wdata);
     }

     /* Setup driver data for this window */
     window->driverdata = wdata;

     /* One window, it always has focus */
     SDL_SetMouseFocus(window);
     SDL_SetKeyboardFocus(window);

     /* Window has been successfully created */
     return 0;
 }

 void
 RPI_DestroyWindow(_THIS, SDL_Window * window)
 {
     SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
     SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
     SDL_DisplayData *displaydata = (SDL_DisplayData *) display->driverdata;

     if(data) {
         if (data->double_buffer) {
             /* Wait for vsync, and then stop vsync callbacks and destroy related stuff, if needed */
             SDL_LockMutex(data->vsync_cond_mutex);
             SDL_CondWait(data->vsync_cond, data->vsync_cond_mutex);
             SDL_UnlockMutex(data->vsync_cond_mutex);

             vc_dispmanx_vsync_callback(displaydata->dispman_display, NULL, NULL);

             SDL_DestroyCond(data->vsync_cond);
             SDL_DestroyMutex(data->vsync_cond_mutex);
         }

 #if SDL_VIDEO_OPENGL_EGL
         if (data->egl_surface != EGL_NO_SURFACE) {
             SDL_EGL_DestroySurface(_this, data->egl_surface);
         }
 #endif
         SDL_free(data);
         window->driverdata = NULL;
     }
 }

 int
 RPI_CreateWindowFrom(_THIS, SDL_Window * window, const void *data)
 {
     return -1;
 }

 void
 RPI_SetWindowTitle(_THIS, SDL_Window * window)
 {
 }
 void
 RPI_SetWindowIcon(_THIS, SDL_Window * window, SDL_Surface * icon)
 {
 }
 void
 RPI_SetWindowPosition(_THIS, SDL_Window * window)
 {
 }
 void
 RPI_SetWindowSize(_THIS, SDL_Window * window)
 {
 }
 void
 RPI_ShowWindow(_THIS, SDL_Window * window)
 {
 }
 void
 RPI_HideWindow(_THIS, SDL_Window * window)
 {
 }
 void
 RPI_RaiseWindow(_THIS, SDL_Window * window)
 {
 }
 void
 RPI_MaximizeWindow(_THIS, SDL_Window * window)
 {
 }
 void
 RPI_MinimizeWindow(_THIS, SDL_Window * window)
 {
 }
 void
 RPI_RestoreWindow(_THIS, SDL_Window * window)
 {
 }

 /*****************************************************************************/
 /* SDL Window Manager function                                               */
 /*****************************************************************************/
 #if 0
 SDL_bool
 RPI_GetWindowWMInfo(_THIS, SDL_Window * window, struct SDL_SysWMinfo *info)
 {
     if (info->version.major <= SDL_MAJOR_VERSION) {
         return SDL_TRUE;
     } else {
         SDL_SetError("application not compiled with SDL %d.%d",
                      SDL_MAJOR_VERSION, SDL_MINOR_VERSION);
         return SDL_FALSE;
     }

     /* Failed to get window manager information */
     return SDL_FALSE;
 }
 #endif

 #endif /* SDL_VIDEO_DRIVER_RPI */

 /* vi: set ts=4 sw=4 expandtab: */
	/*
	Simple DirectMedia Layer
	Copyright (C) 1997-2021 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_RPI

	/* References
	* http://elinux.org/RPi_VideoCore_APIs
	* https://github.com/raspberrypi/firmware/blob/master/opt/vc/src/hello_pi/hello_triangle/triangle.c
	* http://cgit.freedesktop.org/wayland/weston/tree/src/rpi-renderer.c
	* http://cgit.freedesktop.org/wayland/weston/tree/src/compositor-rpi.c
	*/

	/* SDL internals */
	#include "../SDL_sysvideo.h"
	#include "SDL_version.h"
	#include "SDL_syswm.h"
	#include "SDL_loadso.h"
	#include "SDL_events.h"
	#include "../../events/SDL_mouse_c.h"
	#include "../../events/SDL_keyboard_c.h"
	#include "SDL_hints.h"

	#ifdef SDL_INPUT_LINUXEV
	#include "../../core/linux/SDL_evdev.h"
	#endif

	/* RPI declarations */
	#include "SDL_rpivideo.h"
	#include "SDL_rpievents_c.h"
	#include "SDL_rpiopengles.h"
	#include "SDL_rpimouse.h"

	static void
	RPI_Destroy(SDL_VideoDevice * device)
	{
	SDL_free(device->driverdata);
	SDL_free(device);
	}

	static int
	RPI_GetRefreshRate()
	{
	TV_DISPLAY_STATE_T tvstate;
	if (vc_tv_get_display_state( &tvstate ) == 0) {
	//The width/height parameters are in the same position in the union
	//for HDMI and SDTV
	HDMI_PROPERTY_PARAM_T property;
	property.property = HDMI_PROPERTY_PIXEL_CLOCK_TYPE;
	vc_tv_hdmi_get_property(&property);
	return property.param1 == HDMI_PIXEL_CLOCK_TYPE_NTSC ?
	tvstate.display.hdmi.frame_rate * (1000.0f/1001.0f) :
	tvstate.display.hdmi.frame_rate;
	}
	return 60; /* Failed to get display state, default to 60 */
	}

	static SDL_VideoDevice *
	RPI_Create()
	{
	SDL_VideoDevice *device;
	SDL_VideoData *phdata;

	/* Initialize SDL_VideoDevice structure */
	device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
	if (device == NULL) {
	SDL_OutOfMemory();
	return NULL;
	}

	/* Initialize internal data */
	phdata = (SDL_VideoData *) SDL_calloc(1, sizeof(SDL_VideoData));
	if (phdata == NULL) {
	SDL_OutOfMemory();
	SDL_free(device);
	return NULL;
	}

	device->driverdata = phdata;

	/* Setup amount of available displays */
	device->num_displays = 0;

	/* Set device free function */
	device->free = RPI_Destroy;

	/* Setup all functions which we can handle */
	device->VideoInit = RPI_VideoInit;
	device->VideoQuit = RPI_VideoQuit;
	device->GetDisplayModes = RPI_GetDisplayModes;
	device->SetDisplayMode = RPI_SetDisplayMode;
	device->CreateSDLWindow = RPI_CreateWindow;
	device->CreateSDLWindowFrom = RPI_CreateWindowFrom;
	device->SetWindowTitle = RPI_SetWindowTitle;
	device->SetWindowIcon = RPI_SetWindowIcon;
	device->SetWindowPosition = RPI_SetWindowPosition;
	device->SetWindowSize = RPI_SetWindowSize;
	device->ShowWindow = RPI_ShowWindow;
	device->HideWindow = RPI_HideWindow;
	device->RaiseWindow = RPI_RaiseWindow;
	device->MaximizeWindow = RPI_MaximizeWindow;
	device->MinimizeWindow = RPI_MinimizeWindow;
	device->RestoreWindow = RPI_RestoreWindow;
	device->DestroyWindow = RPI_DestroyWindow;
	#if 0
	device->GetWindowWMInfo = RPI_GetWindowWMInfo;
	#endif
	device->GL_LoadLibrary = RPI_GLES_LoadLibrary;
	device->GL_GetProcAddress = RPI_GLES_GetProcAddress;
	device->GL_UnloadLibrary = RPI_GLES_UnloadLibrary;
	device->GL_CreateContext = RPI_GLES_CreateContext;
	device->GL_MakeCurrent = RPI_GLES_MakeCurrent;
	device->GL_SetSwapInterval = RPI_GLES_SetSwapInterval;
	device->GL_GetSwapInterval = RPI_GLES_GetSwapInterval;
	device->GL_SwapWindow = RPI_GLES_SwapWindow;
	device->GL_DeleteContext = RPI_GLES_DeleteContext;
	device->GL_DefaultProfileConfig = RPI_GLES_DefaultProfileConfig;

	device->PumpEvents = RPI_PumpEvents;

	return device;
	}

	VideoBootStrap RPI_bootstrap = {
	"RPI",
	"RPI Video Driver",
	RPI_Create
	};


	/*****************************************************************************/
	/* SDL Video and Display initialization/handling functions */
	/*****************************************************************************/

	static void
	AddDispManXDisplay(const int display_id)
	{
	DISPMANX_MODEINFO_T modeinfo;
	DISPMANX_DISPLAY_HANDLE_T handle;
	SDL_VideoDisplay display;
	SDL_DisplayMode current_mode;
	SDL_DisplayData *data;

	handle = vc_dispmanx_display_open(display_id);
	if (!handle) {
	return; /* this display isn't available */
	}

	if (vc_dispmanx_display_get_info(handle, &modeinfo) < 0) {
	vc_dispmanx_display_close(handle);
	return;
	}

	/* RPI_GetRefreshRate() doesn't distinguish between displays. I'm not sure the hardware distinguishes either */
	SDL_zero(current_mode);
	current_mode.w = modeinfo.width;
	current_mode.h = modeinfo.height;
	current_mode.refresh_rate = RPI_GetRefreshRate();
	/* 32 bpp for default */
	current_mode.format = SDL_PIXELFORMAT_ABGR8888;

	current_mode.driverdata = NULL;

	SDL_zero(display);
	display.desktop_mode = current_mode;
	display.current_mode = current_mode;

	/* Allocate display internal data */
	data = (SDL_DisplayData *) SDL_calloc(1, sizeof(SDL_DisplayData));
	if (data == NULL) {
	vc_dispmanx_display_close(handle);
	return; /* oh well */
	}

	data->dispman_display = handle;

	display.driverdata = data;

	SDL_AddVideoDisplay(&display, SDL_FALSE);
	}

	int
	RPI_VideoInit(_THIS)
	{
	/* Initialize BCM Host */
	bcm_host_init();

	AddDispManXDisplay(DISPMANX_ID_MAIN_LCD); /* your default display */
	AddDispManXDisplay(DISPMANX_ID_FORCE_OTHER); /* an "other" display...maybe DSI-connected screen while HDMI is your main */

	#ifdef SDL_INPUT_LINUXEV
	if (SDL_EVDEV_Init() < 0) {
	return -1;
	}
	#endif

	RPI_InitMouse(_this);

	return 1;
	}

	void
	RPI_VideoQuit(_THIS)
	{
	#ifdef SDL_INPUT_LINUXEV
	SDL_EVDEV_Quit();
	#endif
	}

	void
	RPI_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
	{
	/* Only one display mode available, the current one */
	SDL_AddDisplayMode(display, &display->current_mode);
	}

	int
	RPI_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
	{
	return 0;
	}

	static void
	RPI_vsync_callback(DISPMANX_UPDATE_HANDLE_T u, void *data)
	{
	SDL_WindowData wdata = ((SDL_WindowData ) data);

	SDL_LockMutex(wdata->vsync_cond_mutex);
	SDL_CondSignal(wdata->vsync_cond);
	SDL_UnlockMutex(wdata->vsync_cond_mutex);
	}

	int
	RPI_CreateWindow(_THIS, SDL_Window * window)
	{
	SDL_WindowData *wdata;
	SDL_VideoDisplay *display;
	SDL_DisplayData *displaydata;
	VC_RECT_T dst_rect;
	VC_RECT_T src_rect;
	VC_DISPMANX_ALPHA_T dispman_alpha;
	DISPMANX_UPDATE_HANDLE_T dispman_update;
	uint32_t layer = SDL_RPI_VIDEOLAYER;
	const char *env;

	/* Disable alpha, otherwise the app looks composed with whatever dispman is showing (X11, console,etc) */
	dispman_alpha.flags = DISPMANX_FLAGS_ALPHA_FIXED_ALL_PIXELS;
	dispman_alpha.opacity = 0xFF;
	dispman_alpha.mask = 0;

	/* Allocate window internal data */
	wdata = (SDL_WindowData *) SDL_calloc(1, sizeof(SDL_WindowData));
	if (wdata == NULL) {
	return SDL_OutOfMemory();
	}
	display = SDL_GetDisplayForWindow(window);
	displaydata = (SDL_DisplayData *) display->driverdata;

	/* Windows have one size for now */
	window->w = display->desktop_mode.w;
	window->h = display->desktop_mode.h;

	/* OpenGL ES is the law here, buddy */
	window->flags \|= SDL_WINDOW_OPENGL;

	/* Create a dispman element and associate a window to it */
	dst_rect.x = 0;
	dst_rect.y = 0;
	dst_rect.width = window->w;
	dst_rect.height = window->h;

	src_rect.x = 0;
	src_rect.y = 0;
	src_rect.width = window->w << 16;
	src_rect.height = window->h << 16;

	env = SDL_GetHint(SDL_HINT_RPI_VIDEO_LAYER);
	if (env) {
	layer = SDL_atoi(env);
	}

	dispman_update = vc_dispmanx_update_start( 0 );
	wdata->dispman_window.element = vc_dispmanx_element_add (dispman_update,
	displaydata->dispman_display,
	layer /* layer */,
	&dst_rect,
	0 /src/,
	&src_rect,
	DISPMANX_PROTECTION_NONE,
	&dispman_alpha /alpha/,
	0 /clamp/,
	0 /transform/);
	wdata->dispman_window.width = window->w;
	wdata->dispman_window.height = window->h;
	vc_dispmanx_update_submit_sync(dispman_update);

	if (!_this->egl_data) {
	if (SDL_GL_LoadLibrary(NULL) < 0) {
	return -1;
	}
	}
	wdata->egl_surface = SDL_EGL_CreateSurface(_this, (NativeWindowType) &wdata->dispman_window);

	if (wdata->egl_surface == EGL_NO_SURFACE) {
	return SDL_SetError("Could not create GLES window surface");
	}

	/* Start generating vsync callbacks if necesary */
	wdata->double_buffer = SDL_FALSE;
	if (SDL_GetHintBoolean(SDL_HINT_VIDEO_DOUBLE_BUFFER, SDL_FALSE)) {
	wdata->vsync_cond = SDL_CreateCond();
	wdata->vsync_cond_mutex = SDL_CreateMutex();
	wdata->double_buffer = SDL_TRUE;
	vc_dispmanx_vsync_callback(displaydata->dispman_display, RPI_vsync_callback, (void*)wdata);
	}

	/* Setup driver data for this window */
	window->driverdata = wdata;

	/* One window, it always has focus */
	SDL_SetMouseFocus(window);
	SDL_SetKeyboardFocus(window);

	/* Window has been successfully created */
	return 0;
	}

	void
	RPI_DestroyWindow(_THIS, SDL_Window * window)
	{
	SDL_WindowData data = (SDL_WindowData ) window->driverdata;
	SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
	SDL_DisplayData displaydata = (SDL_DisplayData ) display->driverdata;

	if(data) {
	if (data->double_buffer) {
	/* Wait for vsync, and then stop vsync callbacks and destroy related stuff, if needed */
	SDL_LockMutex(data->vsync_cond_mutex);
	SDL_CondWait(data->vsync_cond, data->vsync_cond_mutex);
	SDL_UnlockMutex(data->vsync_cond_mutex);

	vc_dispmanx_vsync_callback(displaydata->dispman_display, NULL, NULL);

	SDL_DestroyCond(data->vsync_cond);
	SDL_DestroyMutex(data->vsync_cond_mutex);
	}

	#if SDL_VIDEO_OPENGL_EGL
	if (data->egl_surface != EGL_NO_SURFACE) {
	SDL_EGL_DestroySurface(_this, data->egl_surface);
	}
	#endif
	SDL_free(data);
	window->driverdata = NULL;
	}
	}

	int
	RPI_CreateWindowFrom(_THIS, SDL_Window * window, const void *data)
	{
	return -1;
	}

	void
	RPI_SetWindowTitle(_THIS, SDL_Window * window)
	{
	}
	void
	RPI_SetWindowIcon(_THIS, SDL_Window * window, SDL_Surface * icon)
	{
	}
	void
	RPI_SetWindowPosition(_THIS, SDL_Window * window)
	{
	}
	void
	RPI_SetWindowSize(_THIS, SDL_Window * window)
	{
	}
	void
	RPI_ShowWindow(_THIS, SDL_Window * window)
	{
	}
	void
	RPI_HideWindow(_THIS, SDL_Window * window)
	{
	}
	void
	RPI_RaiseWindow(_THIS, SDL_Window * window)
	{
	}
	void
	RPI_MaximizeWindow(_THIS, SDL_Window * window)
	{
	}
	void
	RPI_MinimizeWindow(_THIS, SDL_Window * window)
	{
	}
	void
	RPI_RestoreWindow(_THIS, SDL_Window * window)
	{
	}

	/*****************************************************************************/
	/* SDL Window Manager function */
	/*****************************************************************************/
	#if 0
	SDL_bool
	RPI_GetWindowWMInfo(_THIS, SDL_Window * window, struct SDL_SysWMinfo *info)
	{
	if (info->version.major <= SDL_MAJOR_VERSION) {
	return SDL_TRUE;
	} else {
	SDL_SetError("application not compiled with SDL %d.%d",
	SDL_MAJOR_VERSION, SDL_MINOR_VERSION);
	return SDL_FALSE;
	}

	/* Failed to get window manager information */
	return SDL_FALSE;
	}
	#endif

	#endif /* SDL_VIDEO_DRIVER_RPI */

	/* vi: set ts=4 sw=4 expandtab: */