path: root/src/unix/sdl/video.c

/*
Copyright (C) 2003-2005 Andrey Nazarov

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program 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 General Public License for more details.

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

//
// vid_sdl.c
//

#include "shared/shared.h"
#include "common/cvar.h"
#include "common/common.h"
#include "common/files.h"
#include "common/zone.h"
#include "client/client.h"
#include "client/input.h"
#include "client/keys.h"
#include "client/video.h"
#include "refresh/refresh.h"
#include "../res/q2pro.xbm"

#include <SDL.h>
#if USE_X11
#include <SDL_syswm.h>
#include <X11/Xutil.h>
#if USE_REF == REF_GL
#include <GL/glx.h>
#include <GL/glxext.h>
typedef const char *(*PFNGLXQUERYEXTENSIONSSTRING)(Display *, int);
#endif
#endif

typedef struct {
    SDL_Surface     *surface;
    SDL_Surface     *icon;
    Uint16          gamma[3][256];
    vidFlags_t      flags;
    struct {
        qboolean    initialized;
        grab_t      grabbed;
    } mouse;
#if USE_X11
    Display         *dpy;
    Window          win;
#if USE_REF == REF_GL
    PFNGLXQUERYEXTENSIONSSTRING glXQueryExtensionsString;
    PFNGLXGETVIDEOSYNCSGIPROC   glXGetVideoSyncSGI;
    PFNGLXWAITVIDEOSYNCSGIPROC  glXWaitVideoSyncSGI;
    GLuint          sync_count;
#endif
#endif
} sdl_state_t;

static sdl_state_t    sdl;

/*
===============================================================================

COMMON SDL VIDEO RELATED ROUTINES

===============================================================================
*/

#if USE_REF == REF_GL
static void init_opengl(void);
#endif

#if USE_X11
static void init_x11(void)
{
    SDL_SysWMinfo   info;

    SDL_VERSION(&info.version);
    if (!SDL_GetWMInfo(&info)) {
        return;
    }

    if (info.subsystem != SDL_SYSWM_X11) {
        return;
    }

    sdl.dpy = info.info.x11.display;
    sdl.win = info.info.x11.window;
}

static void set_wm_hints(void)
{
    XSizeHints hints;

    if (!sdl.dpy) {
        return;
    }

    memset(&hints, 0, sizeof(hints));
    hints.flags = PMinSize | PResizeInc;
    hints.min_width = 64;
    hints.min_height = 64;
    hints.width_inc = 8;
    hints.height_inc = 2;

    XSetWMSizeHints(sdl.dpy, sdl.win, &hints, XA_WM_SIZE_HINTS);
}
#endif

/*
=================
VID_GetClipboardData
=================
*/
char *VID_GetClipboardData(void)
{
#if USE_X11
    Window sowner;
    Atom type, property;
    unsigned long len, bytes_left;
    unsigned char *data;
    int format, result;
    char *ret;

    if (!sdl.dpy) {
        return NULL;
    }

    sowner = XGetSelectionOwner(sdl.dpy, XA_PRIMARY);
    if (sowner == None) {
        return NULL;
    }

    property = XInternAtom(sdl.dpy, "GETCLIPBOARDDATA_PROP", False);

    XConvertSelection(sdl.dpy, XA_PRIMARY, XA_STRING, property, sdl.win, CurrentTime);

    XSync(sdl.dpy, False);

    result = XGetWindowProperty(sdl.dpy, sdl.win, property, 0, 0, False,
                                AnyPropertyType, &type, &format, &len, &bytes_left, &data);

    if (result != Success) {
        return NULL;
    }

    ret = NULL;
    if (bytes_left) {
        result = XGetWindowProperty(sdl.dpy, sdl.win, property, 0, bytes_left, True,
                                    AnyPropertyType, &type, &format, &len, &bytes_left, &data);
        if (result == Success) {
            ret = Z_CopyString((char *)data);
        }
    }

    XFree(data);

    return ret;
#else
    return NULL;
#endif
}

/*
=================
VID_SetClipboardData
=================
*/
void VID_SetClipboardData(const char *data)
{
}

static qboolean set_video_mode(int flags, int forcedepth)
{
    SDL_Surface *surf;
    vrect_t rc;
    int depth;

    flags &= ~(SDL_FULLSCREEN | SDL_RESIZABLE);
    sdl.flags &= ~QVF_FULLSCREEN;

    if (vid_fullscreen->integer > 0) {
        VID_GetFullscreen(&rc, NULL, &depth);
        if (forcedepth) {
            depth = forcedepth;
        }
        Com_DPrintf("...setting fullscreen mode: %dx%d:%d\n",
                    rc.width, rc.height, depth);
        surf = SDL_SetVideoMode(rc.width, rc.height, depth,
                                flags | SDL_FULLSCREEN);
        if (surf) {
            sdl.flags |= QVF_FULLSCREEN;
            goto success;
        }
        Com_EPrintf("Fullscreen video mode failed: %s\n", SDL_GetError());
        Cvar_Set("vid_fullscreen", "0");
    }

    flags |= SDL_RESIZABLE;
    VID_GetGeometry(&rc);
    Com_DPrintf("...setting windowed mode: %dx%d\n", rc.width, rc.height);
    surf = SDL_SetVideoMode(rc.width, rc.height, forcedepth, flags);
    if (!surf) {
        return qfalse;
    }

success:
    // init some stuff for the first time
    if (sdl.surface != surf) {
        sdl.surface = surf;
#if USE_X11
        init_x11();
        set_wm_hints();
#endif
#if USE_REF == REF_GL
        init_opengl();
#endif
    }
    R_ModeChanged(rc.width, rc.height, sdl.flags, surf->pitch, surf->pixels);
    SCR_ModeChanged();
    return qtrue;
}

char *VID_GetDefaultModeList(void)
{
    return Z_CopyString(VID_MODELIST);
}

/*
============
VID_SetMode
============
*/
void VID_SetMode(void)
{
    if (!set_video_mode(sdl.surface->flags, sdl.surface->format->BitsPerPixel)) {
        Com_Error(ERR_FATAL, "Couldn't change video mode: %s", SDL_GetError());
    }
}

void VID_FatalShutdown(void)
{
    SDL_ShowCursor(SDL_ENABLE);
    SDL_WM_GrabInput(SDL_GRAB_OFF);
    SDL_Quit();
}

static qboolean init_video(void)
{
    SDL_Color    color;
    byte *dst;
    char buffer[MAX_QPATH];
    int i, ret;
    cvar_t *vid_hwgamma;

    if (SDL_WasInit(SDL_INIT_EVERYTHING) == 0) {
        ret = SDL_Init(SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE);
    } else {
        ret = SDL_InitSubSystem(SDL_INIT_VIDEO);
    }

    if (ret == -1) {
        Com_EPrintf("Couldn't initialize SDL video: %s\n", SDL_GetError());
        return qfalse;
    }

    if (SDL_VideoDriverName(buffer, sizeof(buffer)) != NULL) {
        Com_Printf("Using SDL video driver: %s\n", buffer);
    }

    sdl.icon = SDL_CreateRGBSurface(SDL_SWSURFACE, q2icon_width,
                                    q2icon_height, 8, 0, 0, 0, 0);
    if (sdl.icon) {
        SDL_SetColorKey(sdl.icon, SDL_SRCCOLORKEY, 0);

        // transparent pixel
        color.r = 255; color.g = 255; color.b = 255;
        SDL_SetColors(sdl.icon, &color, 0, 1);

        // colored pixel
        color.r =   0; color.g = 128; color.b = 128;
        SDL_SetColors(sdl.icon, &color, 1, 1);

        // expand the bitmap
        dst = sdl.icon->pixels;
        for (i = 0; i < q2icon_width * q2icon_height; i++) {
            *dst++ = Q_IsBitSet(q2icon_bits, i);
        }

        SDL_WM_SetIcon(sdl.icon, NULL);
    }

    vid_hwgamma = Cvar_Get("vid_hwgamma", "0", CVAR_REFRESH);

    if (vid_hwgamma->integer) {
        if (SDL_GetGammaRamp(sdl.gamma[0], sdl.gamma[1], sdl.gamma[2]) != -1 &&
            SDL_SetGammaRamp(sdl.gamma[0], sdl.gamma[1], sdl.gamma[2]) != -1) {
            Com_Printf("...enabling hardware gamma\n");
            sdl.flags |= QVF_GAMMARAMP;
        } else {
            Com_Printf("...hardware gamma not supported\n");
            Cvar_Reset(vid_hwgamma);
        }
    }

    SDL_WM_SetCaption(PRODUCT, APPLICATION);

    SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL);

    return qtrue;
}

void VID_Shutdown(void)
{
    if (sdl.flags & QVF_GAMMARAMP) {
        SDL_SetGammaRamp(sdl.gamma[0], sdl.gamma[1], sdl.gamma[2]);
    }
    if (sdl.icon) {
        SDL_FreeSurface(sdl.icon);
    }
    memset(&sdl, 0, sizeof(sdl));

    if (SDL_WasInit(SDL_INIT_EVERYTHING) == SDL_INIT_VIDEO) {
        SDL_Quit();
    } else {
        SDL_QuitSubSystem(SDL_INIT_VIDEO);
    }
}

void VID_UpdateGamma(const byte *table)
{
    Uint16 ramp[256];
    int i;

    if (sdl.flags & QVF_GAMMARAMP) {
        for (i = 0; i < 256; i++) {
            ramp[i] = table[i] << 8;
        }
        SDL_SetGammaRamp(ramp, ramp, ramp);
    }
}

static void activate_event(void)
{
    int state = SDL_GetAppState();
    active_t active;

    if (state & SDL_APPACTIVE) {
        if (state & (SDL_APPMOUSEFOCUS | SDL_APPINPUTFOCUS)) {
            active = ACT_ACTIVATED;
        } else {
            active = ACT_RESTORED;
        }
    } else {
        active = ACT_MINIMIZED;
    }

    CL_Activate(active);
}

static void key_event(SDL_keysym *keysym, qboolean down)
{
    unsigned key1, key2 = 0;

    if (keysym->sym <= 127) {
        // ASCII chars are mapped directly
        Key_Event(keysym->sym, down, com_eventTime);
        return;
    }

#define K(s, d)         case SDLK_ ## s: key1 = K_ ## d; break;
#define KK(s, d1, d2)   case SDLK_ ## s: key1 = K_ ## d1; key2 = K_ ## d2; break;

    switch (keysym->sym) {
        K(KP0,         KP_INS)
        K(KP1,         KP_END)
        K(KP2,         KP_DOWNARROW)
        K(KP3,         KP_PGDN)
        K(KP4,         KP_LEFTARROW)
        K(KP5,         KP_5)
        K(KP6,         KP_RIGHTARROW)
        K(KP7,         KP_HOME)
        K(KP8,         KP_UPARROW)
        K(KP9,         KP_PGUP)
        K(KP_PERIOD,   KP_DEL)
        K(KP_DIVIDE,   KP_SLASH)
        K(KP_MULTIPLY, KP_MULTIPLY)
        K(KP_MINUS,    KP_MINUS)
        K(KP_PLUS,     KP_PLUS)
        K(KP_ENTER,    KP_ENTER)

        K(UP,       UPARROW)
        K(DOWN,     DOWNARROW)
        K(RIGHT,    RIGHTARROW)
        K(LEFT,     LEFTARROW)
        K(INSERT,   INS)
        K(HOME,     HOME)
        K(END,      END)
        K(PAGEUP,   PGUP)
        K(PAGEDOWN, PGDN)

        K(F1,  F1)
        K(F2,  F2)
        K(F3,  F3)
        K(F4,  F4)
        K(F5,  F5)
        K(F6,  F6)
        K(F7,  F7)
        K(F8,  F8)
        K(F9,  F9)
        K(F10, F10)
        K(F11, F11)
        K(F12, F12)

        K(NUMLOCK,   NUMLOCK)
        K(CAPSLOCK,  CAPSLOCK)
        K(SCROLLOCK, SCROLLOCK)
        K(LSUPER,    LWINKEY)
        K(RSUPER,    RWINKEY)
        K(MENU,      MENU)

        KK(RSHIFT, SHIFT, RSHIFT)
        KK(LSHIFT, SHIFT, LSHIFT)
        KK(RCTRL,  CTRL,  RCTRL)
        KK(LCTRL,  CTRL,  LCTRL)
        KK(RALT,   ALT,   RALT)
        KK(LALT,   ALT,   LALT)

#undef K
#undef KK

    default:
        Com_DPrintf("%s: unknown keysym %d\n", __func__, keysym->sym);
        return;
    }

    Key_Event(key1, down, com_eventTime);
    if (key2) {
        Key_Event(key2, down, com_eventTime);
    }
}

static void button_event(int button, qboolean down)
{
    unsigned key;

    if (!sdl.mouse.initialized) {
        return;
    }

#define K(s, d) case SDL_BUTTON_ ## s: key = K_ ## d; break;

    switch (button) {
        K(LEFT,       MOUSE1)
        K(RIGHT,      MOUSE2)
        K(MIDDLE,     MOUSE3)
        K(WHEELUP,    MWHEELUP)
        K(WHEELDOWN,  MWHEELDOWN)

#undef K

    default:
        Com_DPrintf("%s: unknown button %d\n", __func__, button);
        return;
    }

    Key_Event(key, down, com_eventTime);
}

static void resize_event(int w, int h)
{
    if (!sdl.surface) {
        return;
    }
    if (!(sdl.surface->flags & SDL_RESIZABLE)) {
        return;
    }

    Cvar_Set("vid_geometry", va("%dx%d", w, h));
    VID_SetMode();
}

/*
============
VID_PumpEvents
============
*/
void VID_PumpEvents(void)
{
    SDL_Event    event;

    while (SDL_PollEvent(&event)) {
        switch (event.type) {
        case SDL_ACTIVEEVENT:
            activate_event();
            break;
        case SDL_QUIT:
            Com_Quit(NULL, ERR_DISCONNECT);
            break;
        case SDL_VIDEORESIZE:
            resize_event(event.resize.w, event.resize.h);
            return; // process only one resize event per frame
        case SDL_VIDEOEXPOSE:
            SCR_UpdateScreen();
            break;
        case SDL_KEYDOWN:
            key_event(&event.key.keysym, qtrue);
            break;
        case SDL_KEYUP:
            key_event(&event.key.keysym, qfalse);
            break;
        case SDL_MOUSEBUTTONDOWN:
            button_event(event.button.button, qtrue);
            break;
        case SDL_MOUSEBUTTONUP:
            button_event(event.button.button, qfalse);
            break;
        case SDL_MOUSEMOTION:
            IN_MouseEvent(event.motion.x, event.motion.y);
            break;
        }
    }
}

/*
===============================================================================

RENDERER SPECIFIC

===============================================================================
*/

#if USE_REF == REF_SOFT

qboolean VID_Init(void)
{
    if (!init_video()) {
        return qfalse;
    }

    if (!set_video_mode(SDL_SWSURFACE | SDL_HWPALETTE | SDL_RESIZABLE, 8)) {
        Com_EPrintf("Couldn't set video mode: %s\n", SDL_GetError());
        VID_Shutdown();
        return qfalse;
    }

    activate_event();
    return qtrue;
}

void VID_UpdatePalette(const byte *palette)
{
    SDL_Color    colors[256];
    SDL_Color    *c;

    for (c = colors; c < colors + 256; c++) {
        c->r = palette[0];
        c->g = palette[1];
        c->b = palette[2];
        palette += 4;
    }

    SDL_SetPalette(sdl.surface, SDL_LOGPAL, colors, 0, 256);
}

void VID_VideoWait(void)
{
}

qboolean VID_VideoSync(void)
{
    return qtrue;
}

void VID_BeginFrame(void)
{
    SDL_LockSurface(sdl.surface);
}

void VID_EndFrame(void)
{
    SDL_UnlockSurface(sdl.surface);
    SDL_Flip(sdl.surface);
}

#else // USE_REF == REF_SOFT

#if USE_X11

// for debugging
#define SHOW_SYNC() \
    Com_DDDDPrintf("%s: %u\n", __func__, sdl.sync_count)

static unsigned glx_parse_extension_string(const char *s)
{
    static const char *const extnames[] = {
        "GLX_SGI_video_sync",
        NULL
    };

    return Com_ParseExtensionString(s, extnames);
}

static void init_glx(void)
{
    const char *extensions;
    cvar_t *gl_video_sync;
    unsigned mask;

    if (!sdl.dpy) {
        return;
    }

    sdl.glXQueryExtensionsString = SDL_GL_GetProcAddress("glXQueryExtensionsString");
    if (!sdl.glXQueryExtensionsString) {
        return;
    }

    gl_video_sync = Cvar_Get("gl_video_sync", "1", 0);

    extensions = sdl.glXQueryExtensionsString(sdl.dpy, DefaultScreen(sdl.dpy));
    mask = glx_parse_extension_string(extensions);
    if (mask & 1) {
        if (gl_video_sync->integer) {
            Com_Printf("...enabling GLX_SGI_video_sync\n");
            sdl.glXGetVideoSyncSGI = SDL_GL_GetProcAddress("glXGetVideoSyncSGI");
            sdl.glXWaitVideoSyncSGI = SDL_GL_GetProcAddress("glXWaitVideoSyncSGI");
            sdl.glXGetVideoSyncSGI(&sdl.sync_count);
            sdl.flags |= QVF_VIDEOSYNC;
        } else {
            Com_Printf("...ignoring GLX_SGI_video_sync\n");
        }
    } else if (gl_video_sync->integer) {
        Com_Printf("GLX_SGI_video_sync not found\n");
        Cvar_Set("gl_video_sync", "0");
    }
}
#endif

static void init_opengl(void)
{
    int accel;

    SDL_GL_GetAttribute(SDL_GL_ACCELERATED_VISUAL, &accel);
    if (accel) {
        sdl.flags |= QVF_ACCELERATED;
    }

#if USE_X11
    init_glx();
#endif
}

#ifdef __OpenBSD__
#define LIBGL   "libGL.so"
#else
#define LIBGL   "libGL.so.1"
#endif

qboolean VID_Init(void)
{
    cvar_t *gl_driver;
    cvar_t *gl_colorbits;
    cvar_t *gl_depthbits;
    cvar_t *gl_stencilbits;
    char *s;
    int colorbits;
    int depthbits;
    int stencilbits;

    if (!init_video()) {
        return qfalse;
    }

    gl_driver = Cvar_Get("gl_driver", LIBGL, CVAR_REFRESH);
    gl_colorbits = Cvar_Get("gl_colorbits", "0", CVAR_REFRESH);
    gl_depthbits = Cvar_Get("gl_depthbits", "0", CVAR_REFRESH);
    gl_stencilbits = Cvar_Get("gl_stencilbits", "8", CVAR_REFRESH);

    // don't allow absolute or relative paths
    FS_SanitizeFilenameVariable(gl_driver);

    while (1) {
        // ugly hack to work around brain-dead servers that actively
        // check and enforce `gl_driver' cvar to `opengl32', unaware
        // of other systems than Windows
        s = gl_driver->string;
        if (!Q_stricmp(s, "opengl32") || !Q_stricmp(s, "opengl32.dll")) {
            Com_Printf("...attempting to load %s instead of %s\n",
                       gl_driver->default_string, s);
            s = gl_driver->default_string;
        }

        if (SDL_GL_LoadLibrary(s) == 0) {
            break;
        }

        Com_EPrintf("Couldn't load OpenGL library: %s\n", SDL_GetError());
        if (!strcmp(s, gl_driver->default_string)) {
            goto fail;
        }

        // attempt to recover
        Com_Printf("...falling back to %s\n", gl_driver->default_string);
        Cvar_Reset(gl_driver);
    }

    colorbits = Cvar_ClampInteger(gl_colorbits, 0, 32);
    depthbits = Cvar_ClampInteger(gl_depthbits, 0, 32);
    stencilbits = Cvar_ClampInteger(gl_stencilbits, 0, 8);

    if (colorbits == 0)
        colorbits = 24;

    if (depthbits == 0)
        depthbits = colorbits > 16 ? 24 : 16;

    if (depthbits < 24)
        stencilbits = 0;

    if (colorbits > 16) {
        SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
        SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
        SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
    } else {
        SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
        SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
        SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
    }
    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, depthbits);
    SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, stencilbits);
    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

    if (!set_video_mode(SDL_OPENGL | SDL_RESIZABLE, 0)) {
        Com_EPrintf("Couldn't set video mode: %s\n", SDL_GetError());
        goto fail;
    }

    activate_event();
    return qtrue;

fail:
    VID_Shutdown();
    return qfalse;
}

void VID_VideoWait(void)
{
#if USE_X11
    if (!sdl.glXWaitVideoSyncSGI) {
        return;
    }

    sdl.glXWaitVideoSyncSGI(2, 1, &sdl.sync_count);
    SHOW_SYNC();
#endif
}

qboolean VID_VideoSync(void)
{
#if USE_X11
    GLuint count;

    if (!sdl.glXGetVideoSyncSGI) {
        return qtrue;
    }

    if (sdl.glXGetVideoSyncSGI(&count)) {
        return qtrue;
    }

    if (count != sdl.sync_count) {
        sdl.sync_count = count;
        SHOW_SYNC();
        return qtrue;
    }

    return qfalse;
#else
    return qtrue;
#endif
}

void VID_BeginFrame(void)
{
}

void VID_EndFrame(void)
{
    SDL_GL_SwapBuffers();
#if USE_X11
    if (sdl.glXGetVideoSyncSGI) {
        sdl.glXGetVideoSyncSGI(&sdl.sync_count);
        SHOW_SYNC();
    }
#endif
}

void *VID_GetCoreAddr(const char *sym)
{
    return SDL_GL_GetProcAddress(sym);
}

void *VID_GetProcAddr(const char *sym)
{
    return SDL_GL_GetProcAddress(sym);
}

#endif // USE_REF == REF_GL


/*
===============================================================================

MOUSE DRIVER

===============================================================================
*/

static void AcquireMouse(void)
{
    // move cursor to center of the main window before we grab the mouse
    if (sdl.surface) {
        SDL_WarpMouse(sdl.surface->w / 2, sdl.surface->h / 2);
    }

    // pump mouse motion events generated by SDL_WarpMouse
    SDL_PollEvent(NULL);

    // grab the mouse, so SDL enters relative mouse mode
    SDL_WM_GrabInput(SDL_GRAB_ON);
    SDL_ShowCursor(SDL_DISABLE);

    // pump mouse motion events still pending
    SDL_PollEvent(NULL);

    // clear any deltas generated
    SDL_GetRelativeMouseState(NULL, NULL);
}

static qboolean GetMouseMotion(int *dx, int *dy)
{
    if (!sdl.mouse.grabbed) {
        return qfalse;
    }
    SDL_GetRelativeMouseState(dx, dy);
    return qtrue;
}

static void WarpMouse(int x, int y)
{
    SDL_WarpMouse(x, y);
    SDL_PollEvent(NULL);
    SDL_GetRelativeMouseState(NULL, NULL);
}

static void ShutdownMouse(void)
{
    // release the mouse
    SDL_ShowCursor(SDL_ENABLE);
    SDL_WM_GrabInput(SDL_GRAB_OFF);
    SDL_WM_SetCaption(PRODUCT, APPLICATION);
    memset(&sdl.mouse, 0, sizeof(sdl.mouse));
}

static qboolean InitMouse(void)
{
    if (SDL_WasInit(SDL_INIT_VIDEO) != SDL_INIT_VIDEO) {
        return qfalse;
    }

    Com_Printf("SDL mouse initialized.\n");
    sdl.mouse.initialized = qtrue;

    return qtrue;
}

static void GrabMouse(grab_t grab)
{
    if (!sdl.mouse.initialized) {
        return;
    }

    if (sdl.mouse.grabbed == grab) {
        SDL_GetRelativeMouseState(NULL, NULL);
        return;
    }

    if (grab == IN_GRAB) {
        AcquireMouse();
        SDL_WM_SetCaption("[" PRODUCT "]", APPLICATION);
    } else {
        if (sdl.mouse.grabbed == IN_GRAB) {
            SDL_WM_GrabInput(SDL_GRAB_OFF);
            SDL_WM_SetCaption(PRODUCT, APPLICATION);
        }
        if (grab == IN_HIDE) {
            SDL_ShowCursor(SDL_DISABLE);
        } else {
            SDL_ShowCursor(SDL_ENABLE);
        }
    }

    sdl.mouse.grabbed = grab;
}

/*
============
VID_FillInputAPI
============
*/
void VID_FillInputAPI(inputAPI_t *api)
{
    api->Init = InitMouse;
    api->Shutdown = ShutdownMouse;
    api->Grab = GrabMouse;
    api->Warp = WarpMouse;
    api->GetEvents = NULL;
    api->GetMotion = GetMouseMotion;
}