view src/video/SDL_video.c @ 3100:7dc982143c06

Date: Sun, 22 Mar 2009 12:52:29 +0000 From: Luke Benstead Subject: OpenGL 3.0 Context Creation I've attached a patch which implements OpenGL 3.x context creation on the latest SVN. I've added two options to SDL_GL_SetAttribute, these are SDL_GL_CONTEXT_MAJOR_VERSION and SDL_GL_CONTEXT_MINOR_VERSION. These default to 2 and 1 respectively. If the major version is less than 3 then the current context creation method is used, otherwise the appropriate new context creation function is called (depending on the platform). Sample code: if (SDL_Init(SDL_INIT_VIDEO) != 0) { printf("Unable to initialize SDL: %s\n", SDL_GetError()); return 1; } SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3); //Without these 2 lines, SDL will create a GL 2.x context SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0); SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); SDL_Surface* screen = SDL_SetVideoMode( 640, 480, 16, SDL_OPENGL | SDL_FULLSCREEN ); I've implemented context creation on both Win32 and X and run basic tests on both. This patch doesn't provide access to all the options allowed by the new context creation (e.g. shared contexts, forward compatible contexts) but they can be added pretty easily.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 24 Mar 2009 10:43:53 +0000
parents 82e60908fab1
children fef1a835af43 7f684f249ec9
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/* The high-level video driver subsystem */

#include "SDL.h"
#include "SDL_video.h"
#include "SDL_sysvideo.h"
#include "SDL_blit.h"
#include "SDL_pixels_c.h"
#include "SDL_renderer_gl.h"
#include "SDL_renderer_gles.h"
#include "SDL_renderer_sw.h"
#include "../events/SDL_sysevents.h"
#include "../events/SDL_events_c.h"

#if SDL_VIDEO_OPENGL_ES
#include "SDL_opengles.h"
#endif /* SDL_VIDEO_OPENGL_ES */

#if SDL_VIDEO_OPENGL
#include "SDL_opengl.h"

/* On Windows, windows.h defines CreateWindow */
#ifdef CreateWindow
#undef CreateWindow
#endif
#endif /* SDL_VIDEO_OPENGL */

/* Available video drivers */
static VideoBootStrap *bootstrap[] = {
#if SDL_VIDEO_DRIVER_COCOA
    &COCOA_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_X11
    &X11_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_NANOX
    &NX_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_IPOD
    &iPod_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_WSCONS
    &WSCONS_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_FBCON
    &FBCON_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_DIRECTFB
    &DirectFB_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_PS2GS
    &PS2GS_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_VGL
    &VGL_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_SVGALIB
    &SVGALIB_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_GAPI
    &GAPI_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_WIN32
    &WIN32_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_BWINDOW
    &BWINDOW_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_PHOTON
    &photon_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_QNXGF
    &qnxgf_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_EPOC
    &EPOC_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_XBIOS
    &XBIOS_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_GEM
    &GEM_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_DC
    &DC_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_RISCOS
    &RISCOS_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_OS2FS
    &OS2FSLib_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_NDS
    &NDS_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_UIKIT
    &UIKIT_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_DUMMY
    &DUMMY_bootstrap,
#endif
    NULL
};

static SDL_VideoDevice *_this = NULL;

/* Various local functions */
static void SDL_UpdateWindowGrab(SDL_Window * window);

static int
cmpmodes(const void *A, const void *B)
{
    SDL_DisplayMode a = *(const SDL_DisplayMode *) A;
    SDL_DisplayMode b = *(const SDL_DisplayMode *) B;

    if (a.w != b.w) {
        return b.w - a.w;
    }
    if (a.h != b.h) {
        return b.h - a.h;
    }
    if (SDL_BITSPERPIXEL(a.format) != SDL_BITSPERPIXEL(b.format)) {
        return SDL_BITSPERPIXEL(b.format) - SDL_BITSPERPIXEL(a.format);
    }
    if (a.refresh_rate != b.refresh_rate) {
        return b.refresh_rate - a.refresh_rate;
    }
    return 0;
}

static void
SDL_UninitializedVideo()
{
    SDL_SetError("Video subsystem has not been initialized");
}

int
SDL_GetNumVideoDrivers(void)
{
    return SDL_arraysize(bootstrap) - 1;
}

const char *
SDL_GetVideoDriver(int index)
{
    if (index >= 0 && index < SDL_GetNumVideoDrivers()) {
        return bootstrap[index]->name;
    }
    return NULL;
}

/*
 * Initialize the video and event subsystems -- determine native pixel format
 */
int
SDL_VideoInit(const char *driver_name, Uint32 flags)
{
    SDL_VideoDevice *video;
    int index;
    int i;

    /* Toggle the event thread flags, based on OS requirements */
#if defined(MUST_THREAD_EVENTS)
    flags |= SDL_INIT_EVENTTHREAD;
#elif defined(CANT_THREAD_EVENTS)
    if ((flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD) {
        SDL_SetError("OS doesn't support threaded events");
        return -1;
    }
#endif

    /* Start the event loop */
    if (SDL_StartEventLoop(flags) < 0) {
        return -1;
    }
    /* Check to make sure we don't overwrite '_this' */
    if (_this != NULL) {
        SDL_VideoQuit();
    }
    /* Select the proper video driver */
    index = 0;
    video = NULL;
    if (driver_name == NULL) {
        driver_name = SDL_getenv("SDL_VIDEODRIVER");
    }
    if (driver_name != NULL) {
        for (i = 0; bootstrap[i]; ++i) {
            if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) {
                if (bootstrap[i]->available()) {
                    video = bootstrap[i]->create(index);
                }
                break;
            }
        }
    } else {
        for (i = 0; bootstrap[i]; ++i) {
            if (bootstrap[i]->available()) {
                video = bootstrap[i]->create(index);
                if (video != NULL) {
                    break;
                }
            }
        }
    }
    if (video == NULL) {
        if (driver_name) {
            SDL_SetError("%s not available", driver_name);
        } else {
            SDL_SetError("No available video device");
        }
        return -1;
    }
    _this = video;
    _this->name = bootstrap[i]->name;
    _this->next_object_id = 1;


    /* Set some very sane GL defaults */
    _this->gl_config.driver_loaded = 0;
    _this->gl_config.dll_handle = NULL;
    _this->gl_config.red_size = 3;
    _this->gl_config.green_size = 3;
    _this->gl_config.blue_size = 2;
    _this->gl_config.alpha_size = 0;
    _this->gl_config.buffer_size = 0;
    _this->gl_config.depth_size = 16;
    _this->gl_config.stencil_size = 0;
    _this->gl_config.double_buffer = 1;
    _this->gl_config.accum_red_size = 0;
    _this->gl_config.accum_green_size = 0;
    _this->gl_config.accum_blue_size = 0;
    _this->gl_config.accum_alpha_size = 0;
    _this->gl_config.stereo = 0;
    _this->gl_config.multisamplebuffers = 0;
    _this->gl_config.multisamplesamples = 0;
    _this->gl_config.retained_backing = 1;
    _this->gl_config.accelerated = -1;  /* not known, don't set */
    _this->gl_config.major_version = 2;
    _this->gl_config.minor_version = 1;

    /* Initialize the video subsystem */
    if (_this->VideoInit(_this) < 0) {
        SDL_VideoQuit();
        return -1;
    }
    /* Make sure some displays were added */
    if (_this->num_displays == 0) {
        SDL_SetError("The video driver did not add any displays");
        SDL_VideoQuit();
        return (-1);
    }
    /* The software renderer is always available */
    for (i = 0; i < _this->num_displays; ++i) {
#if SDL_VIDEO_RENDER_OGL
        SDL_AddRenderDriver(i, &GL_RenderDriver);
#endif

#if SDL_VIDEO_RENDER_OGL_ES
        SDL_AddRenderDriver(i, &GL_ES_RenderDriver);
#endif
        if (_this->displays[i].num_render_drivers > 0) {
            SDL_AddRenderDriver(i, &SW_RenderDriver);
        }
    }

    /* We're ready to go! */
    return 0;
}

const char *
SDL_GetCurrentVideoDriver()
{
    if (!_this) {
        SDL_UninitializedVideo();
        return NULL;
    }
    return _this->name;
}

SDL_VideoDevice *
SDL_GetVideoDevice()
{
    return _this;
}

int
SDL_AddBasicVideoDisplay(const SDL_DisplayMode * desktop_mode)
{
    SDL_VideoDisplay display;

    SDL_zero(display);
    if (desktop_mode) {
        display.desktop_mode = *desktop_mode;
    }
    display.current_mode = display.desktop_mode;

    return SDL_AddVideoDisplay(&display);
}

int
SDL_AddVideoDisplay(const SDL_VideoDisplay * display)
{
    SDL_VideoDisplay *displays;
    int index = -1;

    displays =
        SDL_realloc(_this->displays,
                    (_this->num_displays + 1) * sizeof(*displays));
    if (displays) {
        index = _this->num_displays++;
        displays[index] = *display;
        displays[index].device = _this;
        _this->displays = displays;
    } else {
        SDL_OutOfMemory();
    }
    return index;
}

int
SDL_GetNumVideoDisplays(void)
{
    if (!_this) {
        SDL_UninitializedVideo();
        return 0;
    }
    return _this->num_displays;
}

int
SDL_SelectVideoDisplay(int index)
{
    if (!_this) {
        SDL_UninitializedVideo();
        return (-1);
    }
    if (index < 0 || index >= _this->num_displays) {
        SDL_SetError("index must be in the range 0 - %d",
                     _this->num_displays - 1);
        return -1;
    }
    _this->current_display = index;
    return 0;
}

int
SDL_GetCurrentVideoDisplay(void)
{
    if (!_this) {
        SDL_UninitializedVideo();
        return (-1);
    }
    return _this->current_display;
}

SDL_bool
SDL_AddDisplayMode(int displayIndex, const SDL_DisplayMode * mode)
{
    SDL_VideoDisplay *display = &_this->displays[displayIndex];
    SDL_DisplayMode *modes;
    int i, nmodes;

    /* Make sure we don't already have the mode in the list */
    modes = display->display_modes;
    nmodes = display->num_display_modes;
    for (i = nmodes; i--;) {
        if (SDL_memcmp(mode, &modes[i], sizeof(*mode)) == 0) {
            return SDL_FALSE;
        }
    }

    /* Go ahead and add the new mode */
    if (nmodes == display->max_display_modes) {
        modes =
            SDL_realloc(modes,
                        (display->max_display_modes + 32) * sizeof(*modes));
        if (!modes) {
            return SDL_FALSE;
        }
        display->display_modes = modes;
        display->max_display_modes += 32;
    }
    modes[nmodes] = *mode;
    display->num_display_modes++;

    return SDL_TRUE;
}

int
SDL_GetNumDisplayModes()
{
    if (_this) {
        SDL_VideoDisplay *display = &SDL_CurrentDisplay;
        if (!display->num_display_modes && _this->GetDisplayModes) {
            _this->GetDisplayModes(_this);
            SDL_qsort(display->display_modes, display->num_display_modes,
                      sizeof(SDL_DisplayMode), cmpmodes);
        }
        return display->num_display_modes;
    }
    return 0;
}

int
SDL_GetDisplayMode(int index, SDL_DisplayMode * mode)
{
    if (index < 0 || index >= SDL_GetNumDisplayModes()) {
        SDL_SetError("index must be in the range of 0 - %d",
                     SDL_GetNumDisplayModes() - 1);
        return -1;
    }
    if (mode) {
        *mode = SDL_CurrentDisplay.display_modes[index];
    }
    return 0;
}

int
SDL_GetDesktopDisplayMode(SDL_DisplayMode * mode)
{
    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    if (mode) {
        *mode = SDL_CurrentDisplay.desktop_mode;
    }
    return 0;
}

int
SDL_GetCurrentDisplayMode(SDL_DisplayMode * mode)
{
    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    if (mode) {
        *mode = SDL_CurrentDisplay.current_mode;
    }
    return 0;
}

SDL_DisplayMode *
SDL_GetClosestDisplayMode(const SDL_DisplayMode * mode,
                          SDL_DisplayMode * closest)
{
    Uint32 target_format;
    int target_refresh_rate;
    int i;
    SDL_DisplayMode *current, *match;

    if (!_this || !mode || !closest) {
        return NULL;
    }
    /* Default to the desktop format */
    if (mode->format) {
        target_format = mode->format;
    } else {
        target_format = SDL_CurrentDisplay.desktop_mode.format;
    }

    /* Default to the desktop refresh rate */
    if (mode->refresh_rate) {
        target_refresh_rate = mode->refresh_rate;
    } else {
        target_refresh_rate = SDL_CurrentDisplay.desktop_mode.refresh_rate;
    }

    match = NULL;
    for (i = 0; i < SDL_GetNumDisplayModes(); ++i) {
        current = &SDL_CurrentDisplay.display_modes[i];

        if (current->w && (current->w < mode->w)) {
            /* Out of sorted modes large enough here */
            break;
        }
        if (current->h && (current->h < mode->h)) {
            if (current->w && (current->w == mode->w)) {
                /* Out of sorted modes large enough here */
                break;
            }
            /* Wider, but not tall enough, due to a different
               aspect ratio. This mode must be skipped, but closer
               modes may still follow. */
            continue;
        }
        if (!match || current->w < match->w || current->h < match->h) {
            match = current;
            continue;
        }
        if (current->format != match->format) {
            /* Sorted highest depth to lowest */
            if (current->format == target_format ||
                (SDL_BITSPERPIXEL(current->format) >=
                 SDL_BITSPERPIXEL(target_format)
                 && SDL_PIXELTYPE(current->format) ==
                 SDL_PIXELTYPE(target_format))) {
                match = current;
            }
            continue;
        }
        if (current->refresh_rate != match->refresh_rate) {
            /* Sorted highest refresh to lowest */
            if (current->refresh_rate >= target_refresh_rate) {
                match = current;
            }
        }
    }
    if (match) {
        if (match->format) {
            closest->format = match->format;
        } else {
            closest->format = mode->format;
        }
        if (match->w && match->h) {
            closest->w = match->w;
            closest->h = match->h;
        } else {
            closest->w = mode->w;
            closest->h = mode->h;
        }
        if (match->refresh_rate) {
            closest->refresh_rate = match->refresh_rate;
        } else {
            closest->refresh_rate = mode->refresh_rate;
        }
        closest->driverdata = match->driverdata;

        /*
         * Pick some reasonable defaults if the app and driver don't
         * care
         */
        if (!closest->format) {
            closest->format = SDL_PIXELFORMAT_RGB888;
        }
        if (!closest->w) {
            closest->w = 640;
        }
        if (!closest->h) {
            closest->h = 480;
        }
        return closest;
    }
    return NULL;
}

int
SDL_SetDisplayMode(const SDL_DisplayMode * mode)
{
    SDL_VideoDisplay *display;
    SDL_DisplayMode display_mode;
    SDL_DisplayMode current_mode;
    int i, ncolors;

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    display = &SDL_CurrentDisplay;
    if (!mode) {
        mode = &display->desktop_mode;
    }
    display_mode = *mode;

    /* Default to the current mode */
    if (!display_mode.format) {
        display_mode.format = display->current_mode.format;
    }
    if (!display_mode.w) {
        display_mode.w = display->current_mode.w;
    }
    if (!display_mode.h) {
        display_mode.h = display->current_mode.h;
    }
    if (!display_mode.refresh_rate) {
        display_mode.refresh_rate = display->current_mode.refresh_rate;
    }
    /* Get a good video mode, the closest one possible */
    if (!SDL_GetClosestDisplayMode(&display_mode, &display_mode)) {
        SDL_SetError("No video mode large enough for %dx%d",
                     display_mode.w, display_mode.h);
        return -1;
    }
    /* See if there's anything left to do */
    SDL_GetCurrentDisplayMode(&current_mode);
    if (SDL_memcmp(&display_mode, &current_mode, sizeof(display_mode)) == 0) {
        return 0;
    }
    /* Actually change the display mode */
    if (_this->SetDisplayMode(_this, &display_mode) < 0) {
        return -1;
    }
    display->current_mode = display_mode;

    /* Set up a palette, if necessary */
    if (SDL_ISPIXELFORMAT_INDEXED(display_mode.format)) {
        ncolors = (1 << SDL_BITSPERPIXEL(display_mode.format));
    } else {
        ncolors = 0;
    }
    if ((!ncolors && display->palette) || (ncolors && !display->palette)
        || (ncolors && ncolors != display->palette->ncolors)) {
        if (display->palette) {
            SDL_FreePalette(display->palette);
            display->palette = NULL;
        }
        if (ncolors) {
            display->palette = SDL_AllocPalette(ncolors);
            if (!display->palette) {
                return -1;
            }
            SDL_DitherColors(display->palette->colors,
                             SDL_BITSPERPIXEL(display_mode.format));
        }
    }
    /* Move any fullscreen windows into position */
    for (i = 0; i < display->num_windows; ++i) {
        SDL_Window *window = &display->windows[i];
        if (FULLSCREEN_VISIBLE(window)) {
            SDL_SetWindowPosition(window->id, window->x, window->y);
        }
    }

    return 0;
}

int
SDL_SetFullscreenDisplayMode(const SDL_DisplayMode * mode)
{
    SDL_VideoDisplay *display;
    SDL_DisplayMode fullscreen_mode;
    int i;

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    display = &SDL_CurrentDisplay;
    if (!mode) {
        mode = &display->desktop_mode;
    }
    if (!SDL_GetClosestDisplayMode(mode, &fullscreen_mode)) {
        SDL_SetError("Couldn't find display mode match");
        return -1;
    }

    if (SDL_memcmp
        (&fullscreen_mode, &display->fullscreen_mode,
         sizeof(fullscreen_mode)) == 0) {
        /* Nothing to do... */
        return 0;
    }
    display->fullscreen_mode = fullscreen_mode;

    /* Actually set the mode if we have a fullscreen window visible */
    for (i = 0; i < display->num_windows; ++i) {
        SDL_Window *window = &display->windows[i];
        if (FULLSCREEN_VISIBLE(window)) {
            if (SDL_SetDisplayMode(&display->fullscreen_mode) < 0) {
                return -1;
            }
        }
        if (window->flags & SDL_WINDOW_FULLSCREEN) {
            SDL_OnWindowResized(window);
        }
    }
    return 0;
}

int
SDL_GetFullscreenDisplayMode(SDL_DisplayMode * mode)
{
    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    if (mode) {
        *mode = SDL_CurrentDisplay.fullscreen_mode;
    }
    return 0;
}

int
SDL_SetDisplayPalette(const SDL_Color * colors, int firstcolor, int ncolors)
{
    SDL_Palette *palette;
    int status = 0;

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    palette = SDL_CurrentDisplay.palette;
    if (!palette) {
        SDL_SetError("Display mode does not have a palette");
        return -1;
    }
    status = SDL_SetPaletteColors(palette, colors, firstcolor, ncolors);

    if (_this->SetDisplayPalette) {
        if (_this->SetDisplayPalette(_this, palette) < 0) {
            status = -1;
        }
    }
    return status;
}

int
SDL_GetDisplayPalette(SDL_Color * colors, int firstcolor, int ncolors)
{
    SDL_Palette *palette;

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    palette = SDL_CurrentDisplay.palette;
    if (!palette->ncolors) {
        SDL_SetError("Display mode does not have a palette");
        return -1;
    }
    if (firstcolor < 0 || (firstcolor + ncolors) > palette->ncolors) {
        SDL_SetError("Palette indices are out of range");
        return -1;
    }
    SDL_memcpy(colors, &palette->colors[firstcolor],
               ncolors * sizeof(*colors));
    return 0;
}

SDL_WindowID
SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
{
    const Uint32 allowed_flags = (SDL_WINDOW_FULLSCREEN |
                                  SDL_WINDOW_OPENGL |
                                  SDL_WINDOW_BORDERLESS |
                                  SDL_WINDOW_RESIZABLE |
                                  SDL_WINDOW_INPUT_GRABBED);
    SDL_VideoDisplay *display;
    SDL_Window window;
    int num_windows;
    SDL_Window *windows;

    if (!_this) {
        SDL_UninitializedVideo();
        return 0;
    }
    if (flags & SDL_WINDOW_OPENGL) {
        if (!_this->GL_CreateContext) {
            SDL_SetError("No OpenGL support in video driver");
            return 0;
        }
        SDL_GL_LoadLibrary(NULL);
    }
    SDL_zero(window);
    window.id = _this->next_object_id++;
    window.x = x;
    window.y = y;
    window.w = w;
    window.h = h;
    window.flags = (flags & allowed_flags);
    window.display = _this->current_display;

    if (_this->CreateWindow && _this->CreateWindow(_this, &window) < 0) {
        if (flags & SDL_WINDOW_OPENGL) {
            SDL_GL_UnloadLibrary();
        }
        return 0;
    }
    display = &SDL_CurrentDisplay;
    num_windows = display->num_windows;
    windows =
        SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
    if (!windows) {
        if (_this->DestroyWindow) {
            _this->DestroyWindow(_this, &window);
        }
        if (flags & SDL_WINDOW_OPENGL) {
            SDL_GL_UnloadLibrary();
        }
        return 0;
    }
    windows[num_windows] = window;
    display->windows = windows;
    display->num_windows++;

    if (title) {
        SDL_SetWindowTitle(window.id, title);
    }
    if (flags & SDL_WINDOW_MAXIMIZED) {
        SDL_MaximizeWindow(window.id);
    }
    if (flags & SDL_WINDOW_MINIMIZED) {
        SDL_MinimizeWindow(window.id);
    }
    if (flags & SDL_WINDOW_SHOWN) {
        SDL_ShowWindow(window.id);
    }
    SDL_UpdateWindowGrab(&window);

    return window.id;
}

SDL_WindowID
SDL_CreateWindowFrom(const void *data)
{
    SDL_VideoDisplay *display;
    SDL_Window window;
    int num_windows;
    SDL_Window *windows;

    if (!_this) {
        SDL_UninitializedVideo();
        return (0);
    }
    SDL_zero(window);
    window.id = _this->next_object_id++;
    window.display = _this->current_display;
    window.flags = SDL_WINDOW_FOREIGN;

    if (!_this->CreateWindowFrom ||
        _this->CreateWindowFrom(_this, &window, data) < 0) {
        return 0;
    }
    display = &SDL_CurrentDisplay;
    num_windows = display->num_windows;
    windows =
        SDL_realloc(display->windows, (num_windows + 1) * sizeof(*windows));
    if (!windows) {
        if (_this->DestroyWindow) {
            _this->DestroyWindow(_this, &window);
        }
        if (window.title) {
            SDL_free(window.title);
        }
        return 0;
    }
    windows[num_windows] = window;
    display->windows = windows;
    display->num_windows++;

    return window.id;
}

int
SDL_RecreateWindow(SDL_Window * window, Uint32 flags)
{
    const Uint32 allowed_flags = (SDL_WINDOW_FULLSCREEN |
                                  SDL_WINDOW_OPENGL |
                                  SDL_WINDOW_BORDERLESS |
                                  SDL_WINDOW_RESIZABLE |
                                  SDL_WINDOW_INPUT_GRABBED);
    char *title = window->title;

    if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
        SDL_SetError("No OpenGL support in video driver");
        return -1;
    }
    if ((window->flags & SDL_WINDOW_OPENGL) != (flags & SDL_WINDOW_OPENGL)) {
        if (flags & SDL_WINDOW_OPENGL) {
            SDL_GL_LoadLibrary(NULL);
        } else {
            SDL_GL_UnloadLibrary();
        }
    }

    if (window->flags & SDL_WINDOW_FOREIGN) {
        /* Can't destroy and re-create foreign windows, hrm */
        flags |= SDL_WINDOW_FOREIGN;
    } else {
        flags &= ~SDL_WINDOW_FOREIGN;
    }

    if (_this->DestroyWindow && !(flags & SDL_WINDOW_FOREIGN)) {
        _this->DestroyWindow(_this, window);
    }

    window->title = NULL;
    window->flags = (flags & allowed_flags);

    if (_this->CreateWindow && !(flags & SDL_WINDOW_FOREIGN)) {
        if (_this->CreateWindow(_this, window) < 0) {
            if (flags & SDL_WINDOW_OPENGL) {
                SDL_GL_UnloadLibrary();
            }
            return -1;
        }
    }

    if (title) {
        SDL_SetWindowTitle(window->id, title);
        SDL_free(title);
    }
    if (flags & SDL_WINDOW_MAXIMIZED) {
        SDL_MaximizeWindow(window->id);
    }
    if (flags & SDL_WINDOW_MINIMIZED) {
        SDL_MinimizeWindow(window->id);
    }
    if (flags & SDL_WINDOW_SHOWN) {
        SDL_ShowWindow(window->id);
    }
    SDL_UpdateWindowGrab(window);

    return 0;
}

SDL_Window *
SDL_GetWindowFromID(SDL_WindowID windowID)
{
    int i, j;

    if (!_this) {
        SDL_UninitializedVideo();
        return NULL;
    }
    for (i = 0; i < _this->num_displays; ++i) {
        SDL_VideoDisplay *display = &_this->displays[i];
        for (j = 0; j < display->num_windows; ++j) {
            SDL_Window *window = &display->windows[j];
            if (window->id == windowID) {
                return window;
            }
        }
    }
    return NULL;
}

SDL_VideoDisplay *
SDL_GetDisplayFromWindow(SDL_Window * window)
{
    if (!_this) {
        SDL_UninitializedVideo();
        return NULL;
    }
    if (!window) {
        return NULL;
    }
    return &_this->displays[window->display];
}

Uint32
SDL_GetWindowFlags(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window) {
        return 0;
    }
    return window->flags;
}

void
SDL_SetWindowTitle(SDL_WindowID windowID, const char *title)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window || title == window->title) {
        return;
    }
    if (window->title) {
        SDL_free(window->title);
    }
    if (title) {
        window->title = SDL_strdup(title);
    } else {
        window->title = NULL;
    }

    if (_this->SetWindowTitle) {
        _this->SetWindowTitle(_this, window);
    }
}

const char *
SDL_GetWindowTitle(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window) {
        return NULL;
    }
    return window->title;
}

void
SDL_SetWindowIcon(SDL_WindowID windowID, SDL_Surface * icon)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window) {
        return;
    }
    if (_this->SetWindowIcon) {
        _this->SetWindowIcon(_this, window, icon);
    }
}

void
SDL_SetWindowData(SDL_WindowID windowID, void *userdata)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window) {
        return;
    }
    window->userdata = userdata;
}

void *
SDL_GetWindowData(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window) {
        return NULL;
    }
    return window->userdata;
}

void
SDL_SetWindowPosition(SDL_WindowID windowID, int x, int y)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);
    SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);

    if (!window) {
        return;
    }
    if (x != SDL_WINDOWPOS_UNDEFINED) {
        window->x = x;
    }
    if (y != SDL_WINDOWPOS_UNDEFINED) {
        window->y = y;
    }
    if (_this->SetWindowPosition) {
        _this->SetWindowPosition(_this, window);
    }
    SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MOVED, x, y);
}

void
SDL_GetWindowPosition(SDL_WindowID windowID, int *x, int *y)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window) {
        return;
    }
    if (x) {
        *x = window->x;
    }
    if (y) {
        *y = window->y;
    }
}

void
SDL_SetWindowSize(SDL_WindowID windowID, int w, int h)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window) {
        return;
    }
    window->w = w;
    window->h = h;

    if (_this->SetWindowSize) {
        _this->SetWindowSize(_this, window);
    }
    SDL_OnWindowResized(window);
}

void
SDL_GetWindowSize(SDL_WindowID windowID, int *w, int *h)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (window) {
        if (w) {
            *w = window->w;
        }
        if (h) {
            *h = window->h;
        }
    } else {
        if (w) {
            *w = 0;
        }
        if (h) {
            *h = 0;
        }
    }
}

void
SDL_ShowWindow(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window || (window->flags & SDL_WINDOW_SHOWN)) {
        return;
    }

    if (_this->ShowWindow) {
        _this->ShowWindow(_this, window);
    }
    SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_SHOWN, 0, 0);
}

void
SDL_HideWindow(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
        return;
    }

    if (_this->HideWindow) {
        _this->HideWindow(_this, window);
    }
    SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_HIDDEN, 0, 0);
}

void
SDL_RaiseWindow(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window || !(window->flags & SDL_WINDOW_SHOWN)) {
        return;
    }
    if (_this->RaiseWindow) {
        _this->RaiseWindow(_this, window);
    }
}

void
SDL_MaximizeWindow(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window || (window->flags & SDL_WINDOW_MAXIMIZED)) {
        return;
    }

    if (_this->MaximizeWindow) {
        _this->MaximizeWindow(_this, window);
    }
    SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MAXIMIZED, 0, 0);
}

void
SDL_MinimizeWindow(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window || (window->flags & SDL_WINDOW_MINIMIZED)) {
        return;
    }

    if (_this->MinimizeWindow) {
        _this->MinimizeWindow(_this, window);
    }
    SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_MINIMIZED, 0, 0);
}

void
SDL_RestoreWindow(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window
        || !(window->flags & (SDL_WINDOW_MAXIMIZED | SDL_WINDOW_MINIMIZED))) {
        return;
    }

    if (_this->RestoreWindow) {
        _this->RestoreWindow(_this, window);
    }
    SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_RESTORED, 0, 0);
}

int
SDL_SetWindowFullscreen(SDL_WindowID windowID, int fullscreen)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window) {
        return -1;
    }
    if (fullscreen) {
        fullscreen = SDL_WINDOW_FULLSCREEN;
    }
    if ((window->flags & SDL_WINDOW_FULLSCREEN) == fullscreen) {
        return 0;
    }
    if (fullscreen) {
        window->flags |= SDL_WINDOW_FULLSCREEN;

        if (FULLSCREEN_VISIBLE(window)) {
            SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);

            /* Hide any other fullscreen windows */
            int i;
            for (i = 0; i < display->num_windows; ++i) {
                SDL_Window *other = &display->windows[i];
                if (other->id != windowID && FULLSCREEN_VISIBLE(other)) {
                    SDL_MinimizeWindow(other->id);
                }
            }

            SDL_SetDisplayMode(&display->fullscreen_mode);
        }
    } else {
        window->flags &= ~SDL_WINDOW_FULLSCREEN;

        if (FULLSCREEN_VISIBLE(window)) {
            SDL_SetDisplayMode(NULL);
        }
    }
    return 0;
}

void
SDL_SetWindowGrab(SDL_WindowID windowID, int mode)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window || (!!mode == !!(window->flags & SDL_WINDOW_INPUT_GRABBED))) {
        return;
    }
    if (mode) {
        window->flags |= SDL_WINDOW_INPUT_GRABBED;
    } else {
        window->flags &= ~SDL_WINDOW_INPUT_GRABBED;
    }
    SDL_UpdateWindowGrab(window);
}

static void
SDL_UpdateWindowGrab(SDL_Window * window)
{
    if ((window->flags & SDL_WINDOW_INPUT_FOCUS) && _this->SetWindowGrab) {
        _this->SetWindowGrab(_this, window);
    }
}

int
SDL_GetWindowGrab(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window) {
        return 0;
    }
    return ((window->flags & SDL_WINDOW_INPUT_GRABBED) != 0);
}

void
SDL_OnWindowShown(SDL_Window * window)
{
    if (window->flags & SDL_WINDOW_FULLSCREEN) {
        SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_FOCUS_GAINED, 0, 0);
    }
}

void
SDL_OnWindowHidden(SDL_Window * window)
{
    if (window->flags & SDL_WINDOW_FULLSCREEN) {
        SDL_SendWindowEvent(window->id, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
    }
}

void
SDL_OnWindowResized(SDL_Window * window)
{
    SDL_Renderer *renderer = window->renderer;

    if (renderer && renderer->DisplayModeChanged) {
        renderer->DisplayModeChanged(renderer);
    }
}

void
SDL_OnWindowFocusGained(SDL_Window * window)
{
    SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);

    if (window->flags & SDL_WINDOW_FULLSCREEN) {
        SDL_SetDisplayMode(&display->fullscreen_mode);
    }
    if (display->gamma && _this->SetDisplayGammaRamp) {
        _this->SetDisplayGammaRamp(_this, display->gamma);
    }
    if ((window->flags & (SDL_WINDOW_INPUT_GRABBED | SDL_WINDOW_FULLSCREEN))
        && _this->SetWindowGrab) {
        _this->SetWindowGrab(_this, window);
    }
}

void
SDL_OnWindowFocusLost(SDL_Window * window)
{
    SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);

    if (window->flags & SDL_WINDOW_FULLSCREEN) {
        SDL_MinimizeWindow(window->id);
        SDL_SetDisplayMode(NULL);
    }
    if (display->gamma && _this->SetDisplayGammaRamp) {
        _this->SetDisplayGammaRamp(_this, display->saved_gamma);
    }
    if ((window->flags & (SDL_WINDOW_INPUT_GRABBED | SDL_WINDOW_FULLSCREEN))
        && _this->SetWindowGrab) {
        _this->SetWindowGrab(_this, window);
    }
}

SDL_WindowID
SDL_GetFocusWindow(void)
{
    SDL_VideoDisplay *display;
    int i;

    if (!_this) {
        return 0;
    }
    display = &SDL_CurrentDisplay;
    for (i = 0; i < display->num_windows; ++i) {
        SDL_Window *window = &display->windows[i];

        if (window->flags & SDL_WINDOW_INPUT_FOCUS) {
            return window->id;
        }
    }
    return 0;
}

void
SDL_DestroyWindow(SDL_WindowID windowID)
{
    int i, j;

    if (!_this) {
        return;
    }
    /* Restore video mode, etc. */
    SDL_SendWindowEvent(windowID, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);

    for (i = 0; i < _this->num_displays; ++i) {
        SDL_VideoDisplay *display = &_this->displays[i];
        for (j = 0; j < display->num_windows; ++j) {
            SDL_Window *window = &display->windows[j];
            if (window->id != windowID) {
                continue;
            }
            if (window->title) {
                SDL_free(window->title);
                window->title = NULL;
            }
            if (window->renderer) {
                SDL_DestroyRenderer(window->id);
                window->renderer = NULL;
            }
            if (_this->DestroyWindow) {
                _this->DestroyWindow(_this, window);
            }
            if (window->flags & SDL_WINDOW_OPENGL) {
                SDL_GL_UnloadLibrary();
            }
            if (j != display->num_windows - 1) {
                SDL_memcpy(&display->windows[i],
                           &display->windows[i + 1],
                           (display->num_windows - i - 1) * sizeof(*window));
            }
            --display->num_windows;
            return;
        }
    }
}

void
SDL_AddRenderDriver(int displayIndex, const SDL_RenderDriver * driver)
{
    SDL_VideoDisplay *display;
    SDL_RenderDriver *render_drivers;

    if (displayIndex >= _this->num_displays) {
        return;
    }
    display = &_this->displays[displayIndex];

    render_drivers =
        SDL_realloc(display->render_drivers,
                    (display->num_render_drivers +
                     1) * sizeof(*render_drivers));
    if (render_drivers) {
        render_drivers[display->num_render_drivers] = *driver;
        display->render_drivers = render_drivers;
        display->num_render_drivers++;
    }
}

int
SDL_GetNumRenderDrivers(void)
{
    if (_this) {
        return SDL_CurrentDisplay.num_render_drivers;
    }
    return 0;
}

int
SDL_GetRenderDriverInfo(int index, SDL_RendererInfo * info)
{
    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    if (index < 0 || index >= SDL_GetNumRenderDrivers()) {
        SDL_SetError("index must be in the range of 0 - %d",
                     SDL_GetNumRenderDrivers() - 1);
        return -1;
    }
    *info = SDL_CurrentDisplay.render_drivers[index].info;
    return 0;
}

int
SDL_CreateRenderer(SDL_WindowID windowID, int index, Uint32 flags)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window) {
        SDL_SetError("Invalid window ID");
        return -1;
    }
    if (index < 0) {
        const char *override = SDL_getenv("SDL_VIDEO_RENDERER");
        int n = SDL_GetNumRenderDrivers();
        for (index = 0; index < n; ++index) {
            SDL_RenderDriver *driver =
                &SDL_CurrentDisplay.render_drivers[index];

            if (override) {
                if (SDL_strcasecmp(override, driver->info.name) == 0) {
                    break;
                }
            } else {
                if ((driver->info.flags & flags) == flags) {
                    break;
                }
            }
        }
        if (index == n) {
            SDL_SetError("Couldn't find matching render driver");
            return -1;
        }
    }
    if (index >= SDL_GetNumRenderDrivers()) {
        SDL_SetError("index must be -1 or in the range of 0 - %d",
                     SDL_GetNumRenderDrivers() - 1);
        return -1;
    }
    /* Free any existing renderer */
    SDL_DestroyRenderer(windowID);

    /* Create a new renderer instance */
    window->renderer = SDL_CurrentDisplay.render_drivers[index]
        .CreateRenderer(window, flags);

    if (window->renderer==NULL)
    {
       /* Assuming renderer set its error */
       return -1;
    }

    SDL_SelectRenderer(window->id);

    return 0;
}

int
SDL_SelectRenderer(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);
    SDL_Renderer *renderer;

    if (!window || !window->renderer) {
        return -1;
    }
    renderer = window->renderer;
    if (renderer && renderer->ActivateRenderer) {
        if (renderer->ActivateRenderer(renderer) < 0) {
            return -1;
        }
    }
    SDL_CurrentDisplay.current_renderer = renderer;
    return 0;
}

int
SDL_GetRendererInfo(SDL_RendererInfo * info)
{
    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    if (!SDL_CurrentDisplay.current_renderer) {
        SDL_SetError("There is no current renderer");
        return -1;
    }
    *info = SDL_CurrentDisplay.current_renderer->info;
    return 0;
}

SDL_TextureID
SDL_CreateTexture(Uint32 format, int access, int w, int h)
{
    int hash;
    SDL_Renderer *renderer;
    SDL_Texture *texture;

    if (!_this) {
        SDL_UninitializedVideo();
        return 0;
    }
    renderer = SDL_CurrentDisplay.current_renderer;
    if (!renderer) {
        return 0;
    }
    if (!renderer->CreateTexture) {
        SDL_Unsupported();
        return 0;
    }
    texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
    if (!texture) {
        SDL_OutOfMemory();
        return 0;
    }
    texture->id = _this->next_object_id++;
    texture->format = format;
    texture->access = access;
    texture->w = w;
    texture->h = h;
    texture->r = 255;
    texture->g = 255;
    texture->b = 255;
    texture->a = 255;
    texture->renderer = renderer;

    if (renderer->CreateTexture(renderer, texture) < 0) {
        if (renderer->DestroyTexture) {
            renderer->DestroyTexture(renderer, texture);
        }
        SDL_free(texture);
        return 0;
    }
    hash = (texture->id % SDL_arraysize(SDL_CurrentDisplay.textures));
    texture->next = SDL_CurrentDisplay.textures[hash];
    SDL_CurrentDisplay.textures[hash] = texture;

    return texture->id;
}

SDL_TextureID
SDL_CreateTextureFromSurface(Uint32 format, SDL_Surface * surface)
{
    SDL_TextureID textureID;
    Uint32 requested_format = format;
    SDL_PixelFormat *fmt;
    int bpp;
    Uint32 Rmask, Gmask, Bmask, Amask;

    if (!surface) {
        SDL_SetError("SDL_CreateTextureFromSurface() passed NULL surface");
        return 0;
    }
    fmt = surface->format;

    if (format) {
        if (!SDL_PixelFormatEnumToMasks
            (format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
            SDL_SetError("Unknown pixel format");
            return 0;
        }
    } else {
        /* FIXME: Get the best supported texture format */
        if (surface->format->Amask
            || !(surface->map->info.flags &
                 (SDL_COPY_COLORKEY | SDL_COPY_MASK | SDL_COPY_BLEND))) {
            bpp = fmt->BitsPerPixel;
            Rmask = fmt->Rmask;
            Gmask = fmt->Gmask;
            Bmask = fmt->Bmask;
            Amask = fmt->Amask;
        } else {
            /* Need a format with alpha */
            bpp = 32;
            Rmask = 0x00FF0000;
            Gmask = 0x0000FF00;
            Bmask = 0x000000FF;
            Amask = 0xFF000000;
        }
        format = SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
        if (!format) {
            SDL_SetError("Unknown pixel format");
            return 0;
        }
    }

    textureID =
        SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
                          surface->h);
    if (!textureID && !requested_format) {
        SDL_DisplayMode desktop_mode;
        SDL_GetDesktopDisplayMode(&desktop_mode);
        format = desktop_mode.format;
        textureID =
            SDL_CreateTexture(format, SDL_TEXTUREACCESS_STATIC, surface->w,
                              surface->h);
    }
    if (!textureID) {
        return 0;
    }
    if (bpp == fmt->BitsPerPixel && Rmask == fmt->Rmask && Gmask == fmt->Gmask
        && Bmask == fmt->Bmask && Amask == fmt->Amask) {
        if (SDL_MUSTLOCK(surface)) {
            if (SDL_LockSurface(surface) < 0) {
                SDL_DestroyTexture(textureID);
                return 0;
            }
            SDL_UpdateTexture(textureID, NULL, surface->pixels,
                              surface->pitch);
            SDL_UnlockSurface(surface);
        } else {
            SDL_UpdateTexture(textureID, NULL, surface->pixels,
                              surface->pitch);
        }
    } else {
        SDL_PixelFormat dst_fmt;
        SDL_Surface *dst = NULL;

        /* Set up a destination surface for the texture update */
        SDL_InitFormat(&dst_fmt, bpp, Rmask, Gmask, Bmask, Amask);
        if (SDL_ISPIXELFORMAT_INDEXED(format)) {
            dst_fmt.palette =
                SDL_AllocPalette((1 << SDL_BITSPERPIXEL(format)));
            if (dst_fmt.palette) {
                /*
                 * FIXME: Should we try to copy
                 * fmt->palette?
                 */
                SDL_DitherColors(dst_fmt.palette->colors,
                                 SDL_BITSPERPIXEL(format));
            }
        }
        dst = SDL_ConvertSurface(surface, &dst_fmt, 0);
        if (dst) {
            SDL_UpdateTexture(textureID, NULL, dst->pixels, dst->pitch);
            SDL_FreeSurface(dst);
        }
        if (dst_fmt.palette) {
            SDL_FreePalette(dst_fmt.palette);
        }
        if (!dst) {
            SDL_DestroyTexture(textureID);
            return 0;
        }
    }

    {
        Uint8 r, g, b, a;
        int blendMode;
        int scaleMode;

        SDL_GetSurfaceColorMod(surface, &r, &g, &b);
        SDL_SetTextureColorMod(textureID, r, g, b);

        SDL_GetSurfaceAlphaMod(surface, &a);
        SDL_SetTextureAlphaMod(textureID, a);

        SDL_GetSurfaceBlendMode(surface, &blendMode);
        SDL_SetTextureBlendMode(textureID, blendMode);

        SDL_GetSurfaceScaleMode(surface, &scaleMode);
        SDL_SetTextureScaleMode(textureID, scaleMode);
    }

    if (SDL_ISPIXELFORMAT_INDEXED(format) && fmt->palette) {
        SDL_SetTexturePalette(textureID, fmt->palette->colors, 0,
                              fmt->palette->ncolors);
    }
    return textureID;
}

static __inline__ SDL_Texture *
SDL_GetTextureFromID(SDL_TextureID textureID)
{
    int hash;
    SDL_Texture *texture;

    if (!_this) {
        return NULL;
    }
    hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
    for (texture = SDL_CurrentDisplay.textures[hash]; texture;
         texture = texture->next) {
        if (texture->id == textureID) {
            return texture;
        }
    }
    return NULL;
}

int
SDL_QueryTexture(SDL_TextureID textureID, Uint32 * format, int *access,
                 int *w, int *h)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);

    if (!texture) {
        return -1;
    }
    if (format) {
        *format = texture->format;
    }
    if (access) {
        *access = texture->access;
    }
    if (w) {
        *w = texture->w;
    }
    if (h) {
        *h = texture->h;
    }
    return 0;
}

int
SDL_QueryTexturePixels(SDL_TextureID textureID, void **pixels, int *pitch)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);
    SDL_Renderer *renderer;

    if (!texture) {
        return -1;
    }
    renderer = texture->renderer;
    if (!renderer->QueryTexturePixels) {
        SDL_Unsupported();
        return -1;
    }
    return renderer->QueryTexturePixels(renderer, texture, pixels, pitch);
}

int
SDL_SetTexturePalette(SDL_TextureID textureID, const SDL_Color * colors,
                      int firstcolor, int ncolors)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);
    SDL_Renderer *renderer;

    if (!texture) {
        return -1;
    }
    renderer = texture->renderer;
    if (!renderer->SetTexturePalette) {
        SDL_Unsupported();
        return -1;
    }
    return renderer->SetTexturePalette(renderer, texture, colors, firstcolor,
                                       ncolors);
}

int
SDL_GetTexturePalette(SDL_TextureID textureID, SDL_Color * colors,
                      int firstcolor, int ncolors)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);
    SDL_Renderer *renderer;

    if (!texture) {
        return -1;
    }
    renderer = texture->renderer;
    if (!renderer->GetTexturePalette) {
        SDL_Unsupported();
        return -1;
    }
    return renderer->GetTexturePalette(renderer, texture, colors, firstcolor,
                                       ncolors);
}

int
SDL_SetTextureColorMod(SDL_TextureID textureID, Uint8 r, Uint8 g, Uint8 b)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);
    SDL_Renderer *renderer;

    if (!texture) {
        return -1;
    }
    renderer = texture->renderer;
    if (!renderer->SetTextureColorMod) {
        SDL_Unsupported();
        return -1;
    }
    if (r < 255 || g < 255 || b < 255) {
        texture->modMode |= SDL_TEXTUREMODULATE_COLOR;
    } else {
        texture->modMode &= ~SDL_TEXTUREMODULATE_COLOR;
    }
    texture->r = r;
    texture->g = g;
    texture->b = b;
    return renderer->SetTextureColorMod(renderer, texture);
}

int
SDL_GetTextureColorMod(SDL_TextureID textureID, Uint8 * r, Uint8 * g,
                       Uint8 * b)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);
    SDL_Renderer *renderer;

    if (!texture) {
        return -1;
    }
    renderer = texture->renderer;
    if (r) {
        *r = texture->r;
    }
    if (g) {
        *g = texture->g;
    }
    if (b) {
        *b = texture->b;
    }
    return 0;
}

int
SDL_SetTextureAlphaMod(SDL_TextureID textureID, Uint8 alpha)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);
    SDL_Renderer *renderer;

    if (!texture) {
        return -1;
    }
    renderer = texture->renderer;
    if (!renderer->SetTextureAlphaMod) {
        SDL_Unsupported();
        return -1;
    }
    if (alpha < 255) {
        texture->modMode |= SDL_TEXTUREMODULATE_ALPHA;
    } else {
        texture->modMode &= ~SDL_TEXTUREMODULATE_ALPHA;
    }
    texture->a = alpha;
    return renderer->SetTextureAlphaMod(renderer, texture);
}

int
SDL_GetTextureAlphaMod(SDL_TextureID textureID, Uint8 * alpha)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);

    if (!texture) {
        return -1;
    }
    if (alpha) {
        *alpha = texture->a;
    }
    return 0;
}

int
SDL_SetTextureBlendMode(SDL_TextureID textureID, int blendMode)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);
    SDL_Renderer *renderer;

    if (!texture) {
        return -1;
    }
    renderer = texture->renderer;
    if (!renderer->SetTextureBlendMode) {
        SDL_Unsupported();
        return -1;
    }
    texture->blendMode = blendMode;
    return renderer->SetTextureBlendMode(renderer, texture);
}

int
SDL_GetTextureBlendMode(SDL_TextureID textureID, int *blendMode)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);

    if (!texture) {
        return -1;
    }
    if (blendMode) {
        *blendMode = texture->blendMode;
    }
    return 0;
}

int
SDL_SetTextureScaleMode(SDL_TextureID textureID, int scaleMode)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);
    SDL_Renderer *renderer;

    if (!texture) {
        return -1;
    }
    renderer = texture->renderer;
    if (!renderer->SetTextureScaleMode) {
        SDL_Unsupported();
        return -1;
    }
    texture->scaleMode = scaleMode;
    return renderer->SetTextureScaleMode(renderer, texture);
}

int
SDL_GetTextureScaleMode(SDL_TextureID textureID, int *scaleMode)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);

    if (!texture) {
        return -1;
    }
    if (scaleMode) {
        *scaleMode = texture->scaleMode;
    }
    return 0;
}

int
SDL_UpdateTexture(SDL_TextureID textureID, const SDL_Rect * rect,
                  const void *pixels, int pitch)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);
    SDL_Renderer *renderer;
    SDL_Rect full_rect;

    if (!texture) {
        return -1;
    }
    renderer = texture->renderer;
    if (!renderer->UpdateTexture) {
        SDL_Unsupported();
        return -1;
    }
    if (!rect) {
        full_rect.x = 0;
        full_rect.y = 0;
        full_rect.w = texture->w;
        full_rect.h = texture->h;
        rect = &full_rect;
    }
    return renderer->UpdateTexture(renderer, texture, rect, pixels, pitch);
}

int
SDL_LockTexture(SDL_TextureID textureID, const SDL_Rect * rect, int markDirty,
                void **pixels, int *pitch)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);
    SDL_Renderer *renderer;
    SDL_Rect full_rect;

    if (!texture) {
        return -1;
    }
    if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
        SDL_SetError("SDL_LockTexture(): texture must be streaming");
        return -1;
    }
    renderer = texture->renderer;
    if (!renderer->LockTexture) {
        SDL_Unsupported();
        return -1;
    }
    if (!rect) {
        full_rect.x = 0;
        full_rect.y = 0;
        full_rect.w = texture->w;
        full_rect.h = texture->h;
        rect = &full_rect;
    }
    return renderer->LockTexture(renderer, texture, rect, markDirty, pixels,
                                 pitch);
}

void
SDL_UnlockTexture(SDL_TextureID textureID)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);
    SDL_Renderer *renderer;

    if (!texture) {
        return;
    }
    if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
        return;
    }
    renderer = texture->renderer;
    if (!renderer->UnlockTexture) {
        return;
    }
    renderer->UnlockTexture(renderer, texture);
}

void
SDL_DirtyTexture(SDL_TextureID textureID, int numrects,
                 const SDL_Rect * rects)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);
    SDL_Renderer *renderer;

    if (!texture) {
        return;
    }
    if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
        return;
    }
    renderer = texture->renderer;
    if (!renderer->DirtyTexture) {
        return;
    }
    renderer->DirtyTexture(renderer, texture, numrects, rects);
}

int
SDL_SetRenderDrawColor(Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
    SDL_Renderer *renderer;

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    renderer = SDL_CurrentDisplay.current_renderer;
    if (!renderer) {
        return -1;
    }
    renderer->r = r;
    renderer->g = g;
    renderer->b = b;
    renderer->a = a;
    if (renderer->SetDrawColor) {
        return renderer->SetDrawColor(renderer);
    } else {
        return 0;
    }
}

int
SDL_GetRenderDrawColor(Uint8 * r, Uint8 * g, Uint8 * b, Uint8 * a)
{
    SDL_Renderer *renderer;

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    renderer = SDL_CurrentDisplay.current_renderer;
    if (!renderer) {
        return -1;
    }
    if (r) {
        *r = renderer->r;
    }
    if (g) {
        *g = renderer->g;
    }
    if (b) {
        *b = renderer->b;
    }
    if (a) {
        *a = renderer->a;
    }
    return 0;
}

int
SDL_SetRenderDrawBlendMode(int blendMode)
{
    SDL_Renderer *renderer;

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    renderer = SDL_CurrentDisplay.current_renderer;
    if (!renderer) {
        return -1;
    }
    renderer->blendMode = blendMode;
    if (renderer->SetDrawBlendMode) {
        return renderer->SetDrawBlendMode(renderer);
    } else {
        return 0;
    }
}

int
SDL_GetRenderDrawBlendMode(int *blendMode)
{
    SDL_Renderer *renderer;

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    renderer = SDL_CurrentDisplay.current_renderer;
    if (!renderer) {
        return -1;
    }
    *blendMode = renderer->blendMode;
    return 0;
}

int
SDL_RenderPoint(int x, int y)
{
    SDL_Renderer *renderer;
    SDL_Window *window;

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    renderer = SDL_CurrentDisplay.current_renderer;
    if (!renderer) {
        return -1;
    }
    if (!renderer->RenderPoint) {
        SDL_Unsupported();
        return -1;
    }
    window = SDL_GetWindowFromID(renderer->window);
    if (x < 0 || y < 0 || x >= window->w || y >= window->h) {
        return 0;
    }
    return renderer->RenderPoint(renderer, x, y);
}

int
SDL_RenderLine(int x1, int y1, int x2, int y2)
{
    SDL_Renderer *renderer;
    SDL_Window *window;
    SDL_Rect real_rect;

    if (x1 == x2 && y1 == y2) {
        return SDL_RenderPoint(x1, y1);
    }

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    renderer = SDL_CurrentDisplay.current_renderer;
    if (!renderer) {
        return -1;
    }
    if (!renderer->RenderLine) {
        SDL_Unsupported();
        return -1;
    }
    window = SDL_GetWindowFromID(renderer->window);

    real_rect.x = 0;
    real_rect.y = 0;
    real_rect.w = window->w;
    real_rect.h = window->h;
    if (!SDL_IntersectRectAndLine(&real_rect, &x1, &y1, &x2, &y2)) {
        return (0);
    }
    return renderer->RenderLine(renderer, x1, y1, x2, y2);
}

int
SDL_RenderFill(const SDL_Rect * rect)
{
    SDL_Renderer *renderer;
    SDL_Window *window;
    SDL_Rect real_rect;

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    renderer = SDL_CurrentDisplay.current_renderer;
    if (!renderer) {
        return -1;
    }
    if (!renderer->RenderFill) {
        SDL_Unsupported();
        return -1;
    }
    window = SDL_GetWindowFromID(renderer->window);

    real_rect.x = 0;
    real_rect.y = 0;
    real_rect.w = window->w;
    real_rect.h = window->h;
    if (rect) {
        if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
            return 0;
        }
    }
    return renderer->RenderFill(renderer, &real_rect);
}

int
SDL_RenderCopy(SDL_TextureID textureID, const SDL_Rect * srcrect,
               const SDL_Rect * dstrect)
{
    SDL_Texture *texture = SDL_GetTextureFromID(textureID);
    SDL_Renderer *renderer;
    SDL_Window *window;
    SDL_Rect real_srcrect;
    SDL_Rect real_dstrect;

    if (!texture || texture->renderer != SDL_CurrentDisplay.current_renderer) {
        return -1;
    }
    renderer = SDL_CurrentDisplay.current_renderer;
    if (!renderer) {
        return -1;
    }
    if (!renderer->RenderCopy) {
        SDL_Unsupported();
        return -1;
    }
    window = SDL_GetWindowFromID(renderer->window);

    real_srcrect.x = 0;
    real_srcrect.y = 0;
    real_srcrect.w = texture->w;
    real_srcrect.h = texture->h;
    if (srcrect) {
        if (!SDL_IntersectRect(srcrect, &real_srcrect, &real_srcrect)) {
            return 0;
        }
    }

    real_dstrect.x = 0;
    real_dstrect.y = 0;
    real_dstrect.w = window->w;
    real_dstrect.h = window->h;
    if (dstrect) {
        if (!SDL_IntersectRect(dstrect, &real_dstrect, &real_dstrect)) {
            return 0;
        }
        /* Clip srcrect by the same amount as dstrect was clipped */
        if (dstrect->w != real_dstrect.w) {
            int deltax = (real_dstrect.x - dstrect->x);
            int deltaw = (real_dstrect.w - dstrect->w);
            real_srcrect.x += (deltax * dstrect->w) / real_srcrect.w;
            real_srcrect.w += (deltaw * dstrect->w) / real_srcrect.w;
        }
        if (dstrect->h != real_dstrect.h) {
            int deltay = (real_dstrect.y - dstrect->y);
            int deltah = (real_dstrect.h - dstrect->h);
            real_srcrect.y += (deltay * dstrect->h) / real_srcrect.h;
            real_srcrect.h += (deltah * dstrect->h) / real_srcrect.h;
        }
    }

    return renderer->RenderCopy(renderer, texture, &real_srcrect,
                                &real_dstrect);
}

void
SDL_RenderPresent(void)
{
    SDL_Renderer *renderer;

    if (!_this) {
        SDL_UninitializedVideo();
        return;
    }
    renderer = SDL_CurrentDisplay.current_renderer;
    if (!renderer || !renderer->RenderPresent) {
        return;
    }
    renderer->RenderPresent(renderer);
}

void
SDL_DestroyTexture(SDL_TextureID textureID)
{
    int hash;
    SDL_Texture *prev, *texture;
    SDL_Renderer *renderer;

    if (!_this) {
        SDL_UninitializedVideo();
        return;
    }
    /* Look up the texture in the hash table */
    hash = (textureID % SDL_arraysize(SDL_CurrentDisplay.textures));
    prev = NULL;
    for (texture = SDL_CurrentDisplay.textures[hash]; texture;
         prev = texture, texture = texture->next) {
        if (texture->id == textureID) {
            break;
        }
    }
    if (!texture) {
        return;
    }
    /* Unlink the texture from the list */
    if (prev) {
        prev->next = texture->next;
    } else {
        SDL_CurrentDisplay.textures[hash] = texture->next;
    }

    /* Free the texture */
    renderer = texture->renderer;
    renderer->DestroyTexture(renderer, texture);
    SDL_free(texture);
}

void
SDL_DestroyRenderer(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);
    SDL_Renderer *renderer;
    int i;

    if (!window) {
        return;
    }
    renderer = window->renderer;
    if (!renderer) {
        return;
    }
    /* Free existing textures for this renderer */
    for (i = 0; i < SDL_arraysize(SDL_CurrentDisplay.textures); ++i) {
        SDL_Texture *texture;
        SDL_Texture *prev = NULL;
        SDL_Texture *next;
        for (texture = SDL_CurrentDisplay.textures[i]; texture;
             texture = next) {
            next = texture->next;
            if (texture->renderer == renderer) {
                if (prev) {
                    prev->next = next;
                } else {
                    SDL_CurrentDisplay.textures[i] = next;
                }
                renderer->DestroyTexture(renderer, texture);
                SDL_free(texture);
            } else {
                prev = texture;
            }
        }
    }

    /* Free the renderer instance */
    renderer->DestroyRenderer(renderer);

    /* Clear references */
    window->renderer = NULL;
    if (SDL_CurrentDisplay.current_renderer == renderer) {
        SDL_CurrentDisplay.current_renderer = NULL;
    }
}

SDL_bool
SDL_IsScreenSaverEnabled()
{
    if (!_this) {
        return SDL_TRUE;
    }
    return _this->suspend_screensaver ? SDL_FALSE : SDL_TRUE;
}

void
SDL_EnableScreenSaver()
{
    if (!_this) {
        return;
    }
    if (!_this->suspend_screensaver) {
        return;
    }
    _this->suspend_screensaver = SDL_FALSE;
    if (_this->SuspendScreenSaver) {
        _this->SuspendScreenSaver(_this);
    }
}

void
SDL_DisableScreenSaver()
{
    if (!_this) {
        return;
    }
    if (_this->suspend_screensaver) {
        return;
    }
    _this->suspend_screensaver = SDL_TRUE;
    if (_this->SuspendScreenSaver) {
        _this->SuspendScreenSaver(_this);
    }
}

void
SDL_VideoQuit(void)
{
    int i, j;

    if (!_this) {
        return;
    }
    /* Halt event processing before doing anything else */
    SDL_StopEventLoop();
    SDL_EnableScreenSaver();

    /* Clean up the system video */
    for (i = _this->num_displays; i--;) {
        SDL_VideoDisplay *display = &_this->displays[i];
        for (j = display->num_windows; j--;) {
            SDL_DestroyWindow(display->windows[i].id);
        }
        if (display->windows) {
            SDL_free(display->windows);
            display->windows = NULL;
        }
        display->num_windows = 0;
        if (display->render_drivers) {
            SDL_free(display->render_drivers);
            display->render_drivers = NULL;
        }
        display->num_render_drivers = 0;
    }
    _this->VideoQuit(_this);

    for (i = _this->num_displays; i--;) {
        SDL_VideoDisplay *display = &_this->displays[i];
        for (j = display->num_display_modes; j--;) {
            if (display->display_modes[j].driverdata) {
                SDL_free(display->display_modes[j].driverdata);
                display->display_modes[j].driverdata = NULL;
            }
        }
        if (display->display_modes) {
            SDL_free(display->display_modes);
            display->display_modes = NULL;
        }
        if (display->desktop_mode.driverdata) {
            SDL_free(display->desktop_mode.driverdata);
            display->desktop_mode.driverdata = NULL;
        }
        if (display->palette) {
            SDL_FreePalette(display->palette);
            display->palette = NULL;
        }
        if (display->gamma) {
            SDL_free(display->gamma);
            display->gamma = NULL;
        }
        if (display->driverdata) {
            SDL_free(display->driverdata);
            display->driverdata = NULL;
        }
    }
    if (_this->displays) {
        SDL_free(_this->displays);
        _this->displays = NULL;
    }
    _this->free(_this);
    _this = NULL;
}

int
SDL_GL_LoadLibrary(const char *path)
{
    int retval;

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    if (_this->gl_config.driver_loaded) {
        if (path && SDL_strcmp(path, _this->gl_config.driver_path) != 0) {
            SDL_SetError("OpenGL library already loaded");
            return -1;
        }
        retval = 0;
    } else {
        if (!_this->GL_LoadLibrary) {
            SDL_SetError("No dynamic GL support in video driver");
            return -1;
        }
        retval = _this->GL_LoadLibrary(_this, path);
    }
    if (retval == 0) {
        ++_this->gl_config.driver_loaded;
    }
    return (retval);
}

void *
SDL_GL_GetProcAddress(const char *proc)
{
    void *func;

    if (!_this) {
        SDL_UninitializedVideo();
        return NULL;
    }
    func = NULL;
    if (_this->GL_GetProcAddress) {
        if (_this->gl_config.driver_loaded) {
            func = _this->GL_GetProcAddress(_this, proc);
        } else {
            SDL_SetError("No GL driver has been loaded");
        }
    } else {
        SDL_SetError("No dynamic GL support in video driver");
    }
    return func;
}

void
SDL_GL_UnloadLibrary(void)
{
    if (!_this) {
        SDL_UninitializedVideo();
        return;
    }
    if (_this->gl_config.driver_loaded > 0) {
        if (--_this->gl_config.driver_loaded > 0) {
            return;
        }
        if (_this->GL_UnloadLibrary) {
            _this->GL_UnloadLibrary(_this);
        }
    }
}

SDL_bool
SDL_GL_ExtensionSupported(const char *extension)
{
#if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
    const GLubyte *(APIENTRY * glGetStringFunc) (GLenum);
    const char *extensions;
    const char *start;
    const char *where, *terminator;

    /* Extension names should not have spaces. */
    where = SDL_strchr(extension, ' ');
    if (where || *extension == '\0') {
        return SDL_FALSE;
    }
    /* See if there's an environment variable override */
    start = SDL_getenv(extension);
    if (start && *start == '0') {
        return SDL_FALSE;
    }
    /* Lookup the available extensions */
    glGetStringFunc = SDL_GL_GetProcAddress("glGetString");
    if (glGetStringFunc) {
        extensions = (const char *) glGetStringFunc(GL_EXTENSIONS);
    } else {
        extensions = NULL;
    }
    if (!extensions) {
        return SDL_FALSE;
    }
    /*
     * It takes a bit of care to be fool-proof about parsing the OpenGL
     * extensions string. Don't be fooled by sub-strings, etc.
     */

    start = extensions;

    for (;;) {
        where = SDL_strstr(start, extension);
        if (!where)
            break;

        terminator = where + SDL_strlen(extension);
        if (where == start || *(where - 1) == ' ')
            if (*terminator == ' ' || *terminator == '\0')
                return SDL_TRUE;

        start = terminator;
    }
    return SDL_FALSE;
#else
    return SDL_FALSE;
#endif
}

int
SDL_GL_SetAttribute(SDL_GLattr attr, int value)
{
#if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
    int retval;

    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    retval = 0;
    switch (attr) {
    case SDL_GL_RED_SIZE:
        _this->gl_config.red_size = value;
        break;
    case SDL_GL_GREEN_SIZE:
        _this->gl_config.green_size = value;
        break;
    case SDL_GL_BLUE_SIZE:
        _this->gl_config.blue_size = value;
        break;
    case SDL_GL_ALPHA_SIZE:
        _this->gl_config.alpha_size = value;
        break;
    case SDL_GL_DOUBLEBUFFER:
        _this->gl_config.double_buffer = value;
        break;
    case SDL_GL_BUFFER_SIZE:
        _this->gl_config.buffer_size = value;
        break;
    case SDL_GL_DEPTH_SIZE:
        _this->gl_config.depth_size = value;
        break;
    case SDL_GL_STENCIL_SIZE:
        _this->gl_config.stencil_size = value;
        break;
    case SDL_GL_ACCUM_RED_SIZE:
        _this->gl_config.accum_red_size = value;
        break;
    case SDL_GL_ACCUM_GREEN_SIZE:
        _this->gl_config.accum_green_size = value;
        break;
    case SDL_GL_ACCUM_BLUE_SIZE:
        _this->gl_config.accum_blue_size = value;
        break;
    case SDL_GL_ACCUM_ALPHA_SIZE:
        _this->gl_config.accum_alpha_size = value;
        break;
    case SDL_GL_STEREO:
        _this->gl_config.stereo = value;
        break;
    case SDL_GL_MULTISAMPLEBUFFERS:
        _this->gl_config.multisamplebuffers = value;
        break;
    case SDL_GL_MULTISAMPLESAMPLES:
        _this->gl_config.multisamplesamples = value;
        break;
    case SDL_GL_ACCELERATED_VISUAL:
        _this->gl_config.accelerated = value;
        break;
    case SDL_GL_RETAINED_BACKING:
        _this->gl_config.retained_backing = value;
        break;
    case SDL_GL_CONTEXT_MAJOR_VERSION:
        _this->gl_config.major_version = value;
        break;
    case SDL_GL_CONTEXT_MINOR_VERSION:
        _this->gl_config.minor_version = value;
        break;
    default:
        SDL_SetError("Unknown OpenGL attribute");
        retval = -1;
        break;
    }
    return retval;
#else
    SDL_Unsupported();
    return -1;
#endif /* SDL_VIDEO_OPENGL */
}

int
SDL_GL_GetAttribute(SDL_GLattr attr, int *value)
{
#if SDL_VIDEO_OPENGL || SDL_VIDEO_OPENGL_ES
    void (APIENTRY * glGetIntegervFunc) (GLenum pname, GLint * params);
    GLenum (APIENTRY * glGetErrorFunc) (void);
    GLenum attrib = 0;
    GLenum error = 0;

    glGetIntegervFunc = SDL_GL_GetProcAddress("glGetIntegerv");
    if (!glGetIntegervFunc) {
        return -1;
    }

    glGetErrorFunc = SDL_GL_GetProcAddress("glGetError");
    if (!glGetErrorFunc) {
        return -1;
    }

    /* Clear value in any case */
    *value=0;

    switch (attr) {
    case SDL_GL_RETAINED_BACKING:
        *value = _this->gl_config.retained_backing;
        return 0;
    case SDL_GL_RED_SIZE:
        attrib = GL_RED_BITS;
        break;
    case SDL_GL_BLUE_SIZE:
        attrib = GL_BLUE_BITS;
        break;
    case SDL_GL_GREEN_SIZE:
        attrib = GL_GREEN_BITS;
        break;
    case SDL_GL_ALPHA_SIZE:
        attrib = GL_ALPHA_BITS;
        break;
    case SDL_GL_DOUBLEBUFFER:
#ifndef SDL_VIDEO_OPENGL_ES
        attrib = GL_DOUBLEBUFFER;
        break;
#else
        /* OpenGL ES 1.0 and above specifications have EGL_SINGLE_BUFFER      */
        /* parameter which switches double buffer to single buffer. OpenGL ES */
        /* SDL driver must set proper value after initialization              */
        *value = _this->gl_config.double_buffer;
        return 0;
#endif
    case SDL_GL_DEPTH_SIZE:
        attrib = GL_DEPTH_BITS;
        break;
    case SDL_GL_STENCIL_SIZE:
        attrib = GL_STENCIL_BITS;
        break;
#ifndef SDL_VIDEO_OPENGL_ES
    case SDL_GL_ACCUM_RED_SIZE:
        attrib = GL_ACCUM_RED_BITS;
        break;
    case SDL_GL_ACCUM_GREEN_SIZE:
        attrib = GL_ACCUM_GREEN_BITS;
        break;
    case SDL_GL_ACCUM_BLUE_SIZE:
        attrib = GL_ACCUM_BLUE_BITS;
        break;
    case SDL_GL_ACCUM_ALPHA_SIZE:
        attrib = GL_ACCUM_ALPHA_BITS;
        break;
    case SDL_GL_STEREO:
        attrib = GL_STEREO;
        break;
#else
    case SDL_GL_ACCUM_RED_SIZE:
    case SDL_GL_ACCUM_GREEN_SIZE:
    case SDL_GL_ACCUM_BLUE_SIZE:
    case SDL_GL_ACCUM_ALPHA_SIZE:
    case SDL_GL_STEREO:
        /* none of these are supported in OpenGL ES */
        *value = 0;
        return 0;
#endif
    case SDL_GL_MULTISAMPLEBUFFERS:
#ifndef SDL_VIDEO_OPENGL_ES
        attrib = GL_SAMPLE_BUFFERS_ARB;
#else
        attrib = GL_SAMPLE_BUFFERS;
#endif
        break;
    case SDL_GL_MULTISAMPLESAMPLES:
#ifndef SDL_VIDEO_OPENGL_ES
        attrib = GL_SAMPLES_ARB;
#else
        attrib = GL_SAMPLES;
#endif
        break;
    case SDL_GL_BUFFER_SIZE:
        {
            GLint bits = 0;
            GLint component;

            /*
             * there doesn't seem to be a single flag in OpenGL
             * for this!
             */
            glGetIntegervFunc(GL_RED_BITS, &component);
            bits += component;
            glGetIntegervFunc(GL_GREEN_BITS, &component);
            bits += component;
            glGetIntegervFunc(GL_BLUE_BITS, &component);
            bits += component;
            glGetIntegervFunc(GL_ALPHA_BITS, &component);
            bits += component;

            *value = bits;
            return 0;
        }
    case SDL_GL_ACCELERATED_VISUAL:
        {
            /* FIXME: How do we get this information? */
            *value = (_this->gl_config.accelerated != 0);
            return 0;
        }
    default:
        SDL_SetError("Unknown OpenGL attribute");
        return -1;
    }

    glGetIntegervFunc(attrib, (GLint *) value);
    error=glGetErrorFunc();
    if (error!=GL_NO_ERROR)
    {
       switch (error)
       {
          case GL_INVALID_ENUM:
               {
                  SDL_SetError("OpenGL error: GL_INVALID_ENUM");
               }
               break;
          case GL_INVALID_VALUE:
               {
                  SDL_SetError("OpenGL error: GL_INVALID_VALUE");
               }
               break;
          default:
               {
                  SDL_SetError("OpenGL error: %08X", error);
               }
               break;
       }
       return -1;
    }
    return 0;
#else
    SDL_Unsupported();
    return -1;
#endif /* SDL_VIDEO_OPENGL */
}

SDL_GLContext
SDL_GL_CreateContext(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window) {
        return NULL;
    }
    if (!(window->flags & SDL_WINDOW_OPENGL)) {
        SDL_SetError("The specified window isn't an OpenGL window");
        return NULL;
    }
    return _this->GL_CreateContext(_this, window);
}

int
SDL_GL_MakeCurrent(SDL_WindowID windowID, SDL_GLContext context)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (window && !(window->flags & SDL_WINDOW_OPENGL)) {
        SDL_SetError("The specified window isn't an OpenGL window");
        return -1;
    }
    if (!context) {
        window = NULL;
    }
    return _this->GL_MakeCurrent(_this, window, context);
}

int
SDL_GL_SetSwapInterval(int interval)
{
    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    if (_this->GL_SetSwapInterval) {
        return _this->GL_SetSwapInterval(_this, interval);
    } else {
        SDL_SetError("Setting the swap interval is not supported");
        return -1;
    }
}

int
SDL_GL_GetSwapInterval(void)
{
    if (!_this) {
        SDL_UninitializedVideo();
        return -1;
    }
    if (_this->GL_GetSwapInterval) {
        return _this->GL_GetSwapInterval(_this);
    } else {
        SDL_SetError("Getting the swap interval is not supported");
        return -1;
    }
}

void
SDL_GL_SwapWindow(SDL_WindowID windowID)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window) {
        return;
    }
    if (!(window->flags & SDL_WINDOW_OPENGL)) {
        SDL_SetError("The specified window isn't an OpenGL window");
        return;
    }
    _this->GL_SwapWindow(_this, window);
}

void
SDL_GL_DeleteContext(SDL_GLContext context)
{
    if (!_this || !context) {
        return;
    }
    _this->GL_MakeCurrent(_this, NULL, NULL);
    _this->GL_DeleteContext(_this, context);
}

#if 0                           // FIXME
/*
 * Utility function used by SDL_WM_SetIcon(); flags & 1 for color key, flags
 * & 2 for alpha channel.
 */
static void
CreateMaskFromColorKeyOrAlpha(SDL_Surface * icon, Uint8 * mask, int flags)
{
    int x, y;
    Uint32 colorkey;
#define SET_MASKBIT(icon, x, y, mask) \
	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))

    colorkey = icon->format->colorkey;
    switch (icon->format->BytesPerPixel) {
    case 1:
        {
            Uint8 *pixels;
            for (y = 0; y < icon->h; ++y) {
                pixels = (Uint8 *) icon->pixels + y * icon->pitch;
                for (x = 0; x < icon->w; ++x) {
                    if (*pixels++ == colorkey) {
                        SET_MASKBIT(icon, x, y, mask);
                    }
                }
            }
        }
        break;

    case 2:
        {
            Uint16 *pixels;
            for (y = 0; y < icon->h; ++y) {
                pixels = (Uint16 *) icon->pixels + y * icon->pitch / 2;
                for (x = 0; x < icon->w; ++x) {
                    if ((flags & 1) && *pixels == colorkey) {
                        SET_MASKBIT(icon, x, y, mask);
                    } else if ((flags & 2)
                               && (*pixels & icon->format->Amask) == 0) {
                        SET_MASKBIT(icon, x, y, mask);
                    }
                    pixels++;
                }
            }
        }
        break;

    case 4:
        {
            Uint32 *pixels;
            for (y = 0; y < icon->h; ++y) {
                pixels = (Uint32 *) icon->pixels + y * icon->pitch / 4;
                for (x = 0; x < icon->w; ++x) {
                    if ((flags & 1) && *pixels == colorkey) {
                        SET_MASKBIT(icon, x, y, mask);
                    } else if ((flags & 2)
                               && (*pixels & icon->format->Amask) == 0) {
                        SET_MASKBIT(icon, x, y, mask);
                    }
                    pixels++;
                }
            }
        }
        break;
    }
}

/*
 * Sets the window manager icon for the display window.
 */
void
SDL_WM_SetIcon(SDL_Surface * icon, Uint8 * mask)
{
    if (icon && _this->SetIcon) {
        /* Generate a mask if necessary, and create the icon! */
        if (mask == NULL) {
            int mask_len = icon->h * (icon->w + 7) / 8;
            int flags = 0;
            mask = (Uint8 *) SDL_malloc(mask_len);
            if (mask == NULL) {
                return;
            }
            SDL_memset(mask, ~0, mask_len);
            if (icon->flags & SDL_SRCCOLORKEY)
                flags |= 1;
            if (icon->flags & SDL_SRCALPHA)
                flags |= 2;
            if (flags) {
                CreateMaskFromColorKeyOrAlpha(icon, mask, flags);
            }
            _this->SetIcon(_this, icon, mask);
            SDL_free(mask);
        } else {
            _this->SetIcon(_this, icon, mask);
        }
    }
}
#endif

SDL_bool
SDL_GetWindowWMInfo(SDL_WindowID windowID, struct SDL_SysWMinfo *info)
{
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (!window || !_this->GetWindowWMInfo) {
        return SDL_FALSE;
    }
    return (_this->GetWindowWMInfo(_this, window, info));
}

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