glw_imp.c

Quake 2 Source code for students by Theerthan You can also download from idsoftwares.com

/*
Copyright (C) 1997-2001 Id Software, Inc.

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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
/*
** GLW_IMP.C
**
** This file contains ALL Linux specific stuff having to do with the
** OpenGL refresh.  When a port is being made the following functions
** must be implemented by the port:
**
** GLimp_EndFrame
** GLimp_Init
** GLimp_Shutdown
** GLimp_SwitchFullscreen
**
*/

#include <signal.h>

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/keysym.h>
#include <X11/extensions/XShm.h>
#include <Xm/MwmUtil.h>

#include <GL/glx.h>

#include "../ref_gl/gl_local.h"
#include "../client/keys.h"
#include "../linux/rw_linux.h"

GLXContext				gl_cx;

static qboolean			doShm;
static Display			*x_disp;
static Colormap			x_cmap;
static Window			x_win;
static GC				x_gc;
static Visual			*x_vis;
static XVisualInfo		*x_visinfo;

static int				StudlyRGBattributes[] =
{
    GLX_DOUBLEBUFFER,
    GLX_RGBA,
    GLX_RED_SIZE, 4,
    GLX_GREEN_SIZE, 4,
    GLX_BLUE_SIZE, 4,
    GLX_DEPTH_SIZE, 1,
    GLX_SAMPLES_SGIS, 4, /* for better AA */
    None,
};

static int				RGBattributes[] =
{
    GLX_DOUBLEBUFFER,
    GLX_RGBA,
    GLX_RED_SIZE, 4,
    GLX_GREEN_SIZE, 4,
    GLX_BLUE_SIZE, 4,
    GLX_DEPTH_SIZE, 1,
    None,
};

#define STD_EVENT_MASK (StructureNotifyMask | KeyPressMask \
	     | KeyReleaseMask | ExposureMask | PointerMotionMask | \
	     ButtonPressMask | ButtonReleaseMask)

int current_framebuffer;
static int				x_shmeventtype;
//static XShmSegmentInfo	x_shminfo;

static qboolean			oktodraw = false;
static qboolean			X11_active = false;

struct
{
	int key;
	int down;
} keyq[64];
int keyq_head=0;
int keyq_tail=0;

static int		mx, my;
static int p_mouse_x, p_mouse_y;
static cvar_t	*_windowed_mouse;

static cvar_t *sensitivity;
static cvar_t *lookstrafe;
static cvar_t *m_side;
static cvar_t *m_yaw;
static cvar_t *m_pitch;
static cvar_t *m_forward;
static cvar_t *freelook;

int config_notify=0;
int config_notify_width;
int config_notify_height;
						      
typedef unsigned short PIXEL;

// Console variables that we need to access from this module

/*****************************************************************************/
/* MOUSE                                                                     */
/*****************************************************************************/

// this is inside the renderer shared lib, so these are called from vid_so

static qboolean        mouse_avail;
static int     mouse_buttonstate;
static int     mouse_oldbuttonstate;
static int   mouse_x, mouse_y;
static int	old_mouse_x, old_mouse_y;
static float old_windowed_mouse;
static int p_mouse_x, p_mouse_y;

static cvar_t	*_windowed_mouse;
static cvar_t	*m_filter;
static cvar_t	*in_mouse;

static qboolean	mlooking;

// state struct passed in Init
static in_state_t	*in_state;

int XShmQueryExtension(Display *);
int XShmGetEventBase(Display *);

static void signal_handler(int sig)
{
	fprintf(stderr, "Received signal %d, exiting...\n", sig);
	GLimp_Shutdown();
	_exit(0);
}

static void InitSig(void)
{
        struct sigaction sa;
	sigaction(SIGINT, 0, &sa);
	sa.sa_handler = signal_handler;
	sigaction(SIGINT, &sa, 0);
	sigaction(SIGTERM, &sa, 0);
}

/*
** GLimp_SetMode
*/
int GLimp_SetMode( int *pwidth, int *pheight, int mode, qboolean fullscreen )
{
	int width, height;
	GLint attribs[32];

	fprintf(stderr, "GLimp_SetMode\n");

	ri.Con_Printf( PRINT_ALL, "Initializing OpenGL display\n");

	ri.Con_Printf (PRINT_ALL, "...setting mode %d:", mode );

	if ( !ri.Vid_GetModeInfo( &width, &height, mode ) )
	{
		ri.Con_Printf( PRINT_ALL, " invalid mode\n" );
		return rserr_invalid_mode;
	}

	ri.Con_Printf( PRINT_ALL, " %d %d\n", width, height );

	// destroy the existing window
	GLimp_Shutdown ();

	*pwidth = width;
	*pheight = height;

	if ( !GLimp_InitGraphics( fullscreen ) ) {
		// failed to set a valid mode in windowed mode
		return rserr_invalid_mode;
	}
/* 	gl_cx = glXCreateContext( x_disp, x_visinfo, 0, True ); */

	// let the sound and input subsystems know about the new window
	ri.Vid_NewWindow (width, height);

	return rserr_ok;
}

/*
** GLimp_Shutdown
**
** This routine does all OS specific shutdown procedures for the OpenGL
** subsystem.  Under OpenGL this means NULLing out the current DC and
** HGLRC, deleting the rendering context, and releasing the DC acquired
** for the window.  The state structure is also nulled out.
**
*/
void GLimp_Shutdown( void )
{
	fprintf(stderr, "GLimp_Shutdown\n");

	if (!x_disp)
	    return;

	XSynchronize( x_disp, True );
	XAutoRepeatOn(x_disp);
	XCloseDisplay(x_disp);
	x_disp = NULL;
}

/*
** GLimp_Init
**
** This routine is responsible for initializing the OS specific portions
** of OpenGL.  
*/
int GLimp_Init( void *hinstance, void *wndproc )
{
// catch signals so i can turn on auto-repeat and stuff
	InitSig();

	return true;
}

/*
** GLimp_BeginFrame
*/
void GLimp_BeginFrame( float camera_seperation )
{
}

/*
** GLimp_EndFrame
** 
** Responsible for doing a swapbuffers and possibly for other stuff
** as yet to be determined.  Probably better not to make this a GLimp
** function and instead do a call to GLimp_SwapBuffers.
*/
void GLimp_EndFrame (void)
{
	glFlush();
	glXSwapBuffers( x_disp, x_win );
}

/*
** GLimp_AppActivate
*/
void GLimp_AppActivate( qboolean active )
{
}

// ========================================================================
// makes a null cursor
// ========================================================================

static Cursor CreateNullCursor(Display *display, Window root)
{
    Pixmap cursormask; 
    XGCValues xgc;
    GC gc;
    XColor dummycolour;
    Cursor cursor;

    cursormask = XCreatePixmap(display, root, 1, 1, 1/*depth*/);
    xgc.function = GXclear;
    gc =  XCreateGC(display, cursormask, GCFunction, &xgc);
    XFillRectangle(display, cursormask, gc, 0, 0, 1, 1);
    dummycolour.pixel = 0;
    dummycolour.red = 0;
    dummycolour.flags = 04;
    cursor = XCreatePixmapCursor(display, cursormask, cursormask,
          &dummycolour,&dummycolour, 0,0);
    XFreePixmap(display,cursormask);
    XFreeGC(display,gc);
    return cursor;
}

/*
** GLimp_InitGraphics
**
** This initializes the GL implementation specific
** graphics subsystem.
**
** The necessary width and height parameters are grabbed from
** vid.width and vid.height.
*/
qboolean GLimp_InitGraphics( qboolean fullscreen )
{
	int pnum, i;
	XVisualInfo template;
	int num_visuals;
	int template_mask;

	fprintf(stderr, "GLimp_InitGraphics\n");

	srandom(getpid());

	// let the sound and input subsystems know about the new window
	ri.Vid_NewWindow (vid.width, vid.height);

	// open the display
	x_disp = XOpenDisplay(NULL);
	if (!x_disp)
	{
		if (getenv("DISPLAY"))
			Sys_Error("VID: Could not open display [%s]\n",
				getenv("DISPLAY"));
		else
			Sys_Error("VID: Could not open local display\n");
	}
	else
	    fprintf(stderr, "VID: Opened display %s\n", getenv("DISPLAY"));

	XAutoRepeatOff(x_disp);

// for debugging only
	XSynchronize(x_disp, True);

// check for command-line window size
	template_mask = 0;

#if 0
// specify a visual id
	if ((pnum=COM_CheckParm("-visualid")))
	{
		if (pnum >= com_argc-1)
			Sys_Error("VID: -visualid <id#>\n");
		template.visualid = Q_atoi(com_argv[pnum+1]);
		template_mask = VisualIDMask;
	}

// If not specified, use default visual
	else
#endif
	{
		int screen;
		screen = XDefaultScreen(x_disp);
		template.visualid =
			XVisualIDFromVisual(XDefaultVisual(x_disp, screen));
		template_mask = VisualIDMask;
	}

// pick a visual- warn if more than one was available

	x_visinfo = glXChooseVisual( x_disp, DefaultScreen( x_disp ),
				     StudlyRGBattributes );
	if (!x_visinfo)
	{
	    fprintf(stderr, "Using non studly RGB attributes\n");
		x_visinfo = glXChooseVisual( x_disp, DefaultScreen( x_disp ),
					     RGBattributes );
		if (!x_visinfo) Sys_Error( "No matching visual available!\n" );
	}

	ri.Con_Printf(PRINT_ALL, "Using visualid 0x%x:\n",
		   (int)(x_visinfo->visualid));
#if 0
	if (verbose)
	{
		printf("Using visualid %d:\n", (int)(x_visinfo->visualid));
		printf("	screen %d\n", x_visinfo->screen);
		printf("	red_mask 0x%x\n", (int)(x_visinfo->red_mask));
		printf("	green_mask 0x%x\n", (int)(x_visinfo->green_mask));
		printf("	blue_mask 0x%x\n", (int)(x_visinfo->blue_mask));
		printf("	colormap_size %d\n", x_visinfo->colormap_size);
		printf("	bits_per_rgb %d\n", x_visinfo->bits_per_rgb);
	}
#endif

	x_vis = x_visinfo->visual;

// setup attributes for main window
	{
	   int attribmask = CWEventMask  | CWColormap | CWBorderPixel;
	   XSetWindowAttributes attribs;
	   Colormap tmpcmap;
	   
	   Window root_win = XRootWindow(x_disp, x_visinfo->screen);

	   tmpcmap = XCreateColormap(x_disp, root_win, x_vis, AllocNone);
				     
	   
	   attribs.event_mask = STD_EVENT_MASK;
	   attribs.border_pixel = 0;
	   attribs.colormap = tmpcmap;

// create the main window
		x_win = XCreateWindow(	x_disp,
			root_win,		
			0, 0,	// x, y
			vid.width, vid.height,
			0, // borderwidth
			x_visinfo->depth,
			InputOutput,
			x_vis,
			attribmask,
			&attribs );
		XStoreName(x_disp, x_win, "Quake II");

		if (x_visinfo->class != TrueColor)
			XFreeColormap(x_disp, tmpcmap);
	}

	if (x_visinfo->depth == 8)
	{
	// create and upload the palette
		if (x_visinfo->class == PseudoColor)
		{
			x_cmap = XCreateColormap(x_disp, x_win, x_vis, AllocAll);
			XSetWindowColormap(x_disp, x_win, x_cmap);
		}

	}

// inviso cursor
	XDefineCursor(x_disp, x_win, CreateNullCursor(x_disp, x_win));

// create the GC
	{
		XGCValues xgcvalues;
		int valuemask = GCGraphicsExposures;
		xgcvalues.graphics_exposures = False;
		x_gc = XCreateGC(x_disp, x_win, valuemask, &xgcvalues );
	}

// set window properties for full screen
	if (fullscreen) {
	    MotifWmHints    wmhints;
	    Atom aHints;
	    XSizeHints              sizehints;
	    XWindowChanges  changes;

	    aHints = XInternAtom( x_disp, "_MOTIF_WM_HINTS", 0 );
	    if (aHints == None)
	    {
                ri.Con_Printf( PRINT_ALL, "Could not intern X atom for _MOTIF_WM_HINTS." );
/*                 return( false ); */
	    }
	    else {
		wmhints.flags = MWM_HINTS_DECORATIONS;
		wmhints.decorations = 0; // Absolutely no decorations.
		XChangeProperty(x_disp, x_win, aHints, aHints, 32,
				PropModeReplace, (unsigned char *)&wmhints,
				4 );

		sizehints.flags = USPosition | USSize;
		sizehints.x = 0;
		sizehints.y = 0;
		sizehints.width = vid.width;
		sizehints.height = vid.height;
		XSetWMNormalHints( x_disp, x_win, &sizehints );

		changes.x = 0;
		changes.y = 0;
		changes.width = vid.width;
		changes.height = vid.height;
		changes.stack_mode = TopIf;
		XConfigureWindow(x_disp, x_win,
				 CWX | CWY | CWWidth | CWHeight | CWStackMode,
				 &changes);