Linux Graphics Window - setting the title

BlitzMax Forums/BlitzMax Module Tweaks/Linux Graphics Window - setting the title
Brucey
(Posted 2006) [#1]
In linux, a Graphics window doesn't set the window title text like it does on the other two platforms.
This change to glgraphics.linux.c fixes it so that both the default "BlitzMax Application" shows and AppTitle sets the title properly (when set before running the Graphics command, as per the other platforms)

#include <stdio.h>
#include <GL/gl.h>
#include <GL/glx.h>
#include <X11/extensions/xf86vmode.h>
#include <assert.h>

/* Added by BaH */
#include <brl.mod/blitz.mod/blitz.h>
#include <X11/Xutil.h>

extern void bbSystemPoll();
extern Display *bbSystemDisplay();
extern void bbSetSystemWindow(int window);

static XF86VidModeModeInfo **modes,*mode;
static Display *xdisplay;

static int xscreen,xwindow,xfullscreen;

typedef int (* GLXSWAPINTERVALEXT) (int);

GLXSWAPINTERVALEXT glXSwapIntervalEXT;

void *glXExtension(Display *dpy,int screen,const char *catagory,const char *name){
	const char *extensions;
	extensions=glXQueryExtensionsString(dpy,screen);
	if (strstr(extensions,catagory)) {
		return (void*)glXGetProcAddressARB(name);
	}
	return (void*)0;
}

enum{
	MODE_SHARED=0,
	MODE_WIDGET=1,
	MODE_WINDOW=2,
	MODE_DISPLAY=3
};

enum{
	FLAGS_BACKBUFFER=	0x2,
	FLAGS_ALPHABUFFER=	0x4,
	FLAGS_DEPTHBUFFER=	0x8,
	FLAGS_STENCILBUFFER=0x10,
	FLAGS_ACCUMBUFFER=	0x20,
	FLAGS_FULLSCREEN=0x80000000
};

typedef struct BBGLContext BBGLContext;

struct BBGLContext{
	int mode,width,height,depth,hertz,flags,sync;
	int window;
	GLXContext glContext;
};

// glgraphics.bmx interface

int bbGLGraphicsGraphicsModes( int *imodes,int maxcount );
BBGLContext *bbGLGraphicsAttachGraphics( int window,int flags );
BBGLContext *bbGLGraphicsCreateGraphics( int width,int height,int depth,int hz,int flags );
void bbGLGraphicsGetSettings( BBGLContext *context,int *width,int *height,int *depth,int *hz,int *flags );
void bbGLGraphicsClose( BBGLContext *context );
void bbGLGraphicsSetGraphics( BBGLContext *context );
void bbGLGraphicsFlip( int sync );
void bbGLGraphicsSwapSharedContext();
void bbGLExit();

static BBGLContext *_currentContext;
static BBGLContext *_activeContext;
static BBGLContext *_sharedContext;

#define INTERLACE      0x010
#define DBLSCAN        0x020

static XF86VidModeModeInfo _oldMode;

/* Added by BaH */
static const char *_appTitle(){
	return bbStringToCString( bbAppTitle );
}

int _calchertz(XF86VidModeModeInfo *m){
	int	freq;
	freq=(m->dotclock*1000.0)/(m->htotal*m->vtotal)+.5;
	if (m->flags&INTERLACE) freq<<=1;
	if (m->flags&DBLSCAN) freq>>=1;
	return freq;
}

int _initDisplay(){
	int		major,minor;
	if (xdisplay) return 0;
	xdisplay=bbSystemDisplay();
	if (!xdisplay) return -1;
	if (glXQueryVersion(xdisplay,&major,&minor)==0) return -1;
//	printf("glXVersion=%d.%d\n",major,minor);fflush(stdout);
	XF86VidModeQueryVersion(xdisplay,&major,&minor);
//	printf("XF86VidModeExtension-Version %d.%d\n", major,minor);
	xscreen=DefaultScreen(xdisplay);
//	glXSwapIntervalEXT=(GLXSWAPINTERVALEXT)glXGetProcAddressARB("glXSwapIntervalSGI");
	glXSwapIntervalEXT=(GLXSWAPINTERVALEXT)glXExtension(xdisplay,xscreen,"GLX_SGI_swap_control","glXSwapIntervalSGI");
	atexit( bbGLExit );
	return 0;
}

int bbGLGraphicsGraphicsModes( int *imodes,int maxcount ){
	XF86VidModeModeInfo		**xmodes,*m;
	int						count,i;

	if (_initDisplay()) return 0;
	XF86VidModeGetAllModeLines(xdisplay,xscreen,&count,&xmodes);
	if (count>maxcount) count=maxcount;
	for (i=0;i<count;i++)
	{
		m=xmodes[i];
		*imodes++=m->hdisplay;	//width
		*imodes++=m->vdisplay;	//height;
		*imodes++=24;
		*imodes++=_calchertz(m);
	}
	XFree(xmodes);
	return count;
}

static void _swapBuffers( BBGLContext *context ){
	if( !context ) return;
	glXSwapBuffers(xdisplay,context->window);
	bbSystemPoll();
}

BBGLContext *bbGLGraphicsAttachGraphics( int window,int flags ){
	BBGLContext *context=(BBGLContext*)malloc( sizeof(BBGLContext) );
	memset( context,0,sizeof(BBGLContext) );
	context->mode=MODE_WIDGET;	
	context->flags=flags;
	context->sync=-1;	
	context->window=window;
	return context;
}

XVisualInfo *_chooseVisual(flags){
	int glspec[32],*s;
	s=glspec;
	*s++=GLX_RGBA;
	if (flags&FLAGS_BACKBUFFER) *s++=GLX_DOUBLEBUFFER;
	if (flags&FLAGS_ALPHABUFFER) {*s++=GLX_ALPHA_SIZE;*s++=1;}
	if (flags&FLAGS_DEPTHBUFFER) {*s++=GLX_DEPTH_SIZE;*s++=1;}
	if (flags&FLAGS_STENCILBUFFER) {*s++=GLX_STENCIL_SIZE;*s++=1;}
	if (flags&FLAGS_ACCUMBUFFER)
	{
		*s++=GLX_ACCUM_RED_SIZE;*s++=1;
		*s++=GLX_ACCUM_GREEN_SIZE;*s++=1;
		*s++=GLX_ACCUM_BLUE_SIZE;*s++=1;
		*s++=GLX_ACCUM_ALPHA_SIZE;*s++=1;
	}
 	*s++=None;
	return glXChooseVisual(xdisplay,xscreen,glspec);	
}

static void _initSharedContext(){
	if( _sharedContext ) return;
	_sharedContext=bbGLGraphicsCreateGraphics(0,0,0,0,0);
}

void _makeCurrent(	BBGLContext *context ){
	glXMakeCurrent(xdisplay,context->window,context->glContext);	
	_currentContext=context;
}

void bbGLGraphicsSwapSharedContext(){
	if( xfullscreen ) return;
	if( _currentContext!=_sharedContext ){
		_makeCurrent( _sharedContext );
	}else{
		_makeCurrent( _activeContext );
	}
}

static void _validateSize( BBGLContext *context ){
	Window			root_return;
	int				x,y;
	unsigned int	w,h,border,d;
	if( !context || context->mode!=MODE_WIDGET ) return;
	if (_initDisplay()) return;
	XGetGeometry(xdisplay,context->window,&root_return,&x,&y,&w,&h,&border,&d);
	context->width=w;
	context->height=h;
}

static void _validateContext( BBGLContext *context ){
	GLXContext		sharedcontext;
	XVisualInfo 	*vizinfo;

	if( !context || context->glContext ) return;
	if (_initDisplay()) return;

	_initSharedContext();
	sharedcontext=_sharedContext->glContext;
	vizinfo=_chooseVisual(context->flags);
	context->glContext=glXCreateContext(xdisplay,vizinfo,sharedcontext,True);	
	glXMakeCurrent(xdisplay,context->window,context->glContext);	
	bbSetSystemWindow(context->window);
}

void bbGLGraphicsGetSettings( BBGLContext *context,int *width,int *height,int *depth,int *hertz,int *flags ){
	_validateSize( context );
	*width=context->width;
	*height=context->height;
	*depth=context->depth;
	*hertz=context->hertz;
	*flags=context->flags;
}

static Bool WaitForNotify(Display *display,XEvent *event,XPointer arg){
	return (event->type==MapNotify) && (event->xmap.window==(Window)arg);
}

BBGLContext *bbGLGraphicsCreateGraphics( int width,int height,int depth,int hz,int flags ){
	XSetWindowAttributes	swa;
	XVisualInfo 	*vizinfo;
	XEvent					event;
	GLXContext				sharedcontext;
	GLXContext				context;
	int						window;
	int						count,i;
	int						displaymode;

	if (_initDisplay()) return 0;
	if (width==0 && height==0)
	{
		sharedcontext=0;width=100;height=100;
	}
	else
	{
		_initSharedContext();
		sharedcontext=_sharedContext->glContext;
	}
	vizinfo=_chooseVisual(flags);
	if (depth)
	{
		XF86VidModeGetModeLine(xdisplay,xscreen,&_oldMode.dotclock,(XF86VidModeModeLine*)&_oldMode.hdisplay );

		XF86VidModeGetAllModeLines(xdisplay,xscreen,&count,&modes);
		mode=0;
		for (i=0;i<count;i++)
		{
			if (width==modes[i]->hdisplay && height==modes[i]->vdisplay && hz==_calchertz(modes[i]))
			{
				mode=modes[i];
				break;
			}
		}	
		if (mode==0)
		{
			for (i=0;i<count;i++)
			{
				if (width==modes[i]->hdisplay && height==modes[i]->vdisplay)
				{
					mode=modes[i];
					break;
				}
			}	
		}
		if (mode==0) return;
		width=mode->hdisplay;
		height=mode->vdisplay;
		vizinfo=_chooseVisual(flags);
		context=glXCreateContext(xdisplay,vizinfo,sharedcontext,True);
		swa.border_pixel=0;
		swa.event_mask=StructureNotifyMask|ResizeRedirectMask|FocusChangeMask;
		swa.colormap=XCreateColormap(xdisplay,RootWindow(xdisplay,0),vizinfo->visual,AllocNone);
		swa.override_redirect=True;	
		XF86VidModeSwitchToMode(xdisplay,xscreen,mode);
		XF86VidModeSetViewPort(xdisplay,xscreen,0,0);
		window=XCreateWindow(
			xdisplay,
			RootWindow(xdisplay,xscreen),
			0,
			0,
			width,height,
			0,
			vizinfo->depth,
			InputOutput,
			vizinfo->visual,
			CWBorderPixel|CWColormap|CWEventMask|CWOverrideRedirect,
			&swa
		);
		xfullscreen=1;
		displaymode=MODE_DISPLAY;
	}
	else
	{		
		swa.border_pixel=0;
		swa.event_mask=StructureNotifyMask|ResizeRedirectMask;
		swa.colormap=XCreateColormap(xdisplay,RootWindow(xdisplay,0),vizinfo->visual,AllocNone);
		window=XCreateWindow(
			xdisplay,
			RootWindow(xdisplay,xscreen),
			0,
			0,  
			width,height,
			0,
			vizinfo->depth,
			InputOutput,
			vizinfo->visual,
			CWBorderPixel|CWColormap|CWEventMask,
			&swa
		);
		displaymode=MODE_WINDOW;
	}
	context=glXCreateContext(xdisplay,vizinfo,sharedcontext,True);	
	if (sharedcontext) 
	{	
		XMapRaised(xdisplay,window);	
		if (xfullscreen)
		{
			XWarpPointer(xdisplay,None,window,0,0,0,0,0,0);
			XGrabKeyboard(xdisplay,window,True,GrabModeAsync,GrabModeAsync,CurrentTime);
			XGrabPointer(xdisplay,window,True,ButtonPressMask,GrabModeAsync,GrabModeAsync,window,None,CurrentTime);
		}
		glXMakeCurrent(xdisplay,window,context);	
		XIfEvent(xdisplay,&event,WaitForNotify,(XPointer)window);	     
		XSelectInput(xdisplay,window,ResizeRedirectMask|PointerMotionMask|ButtonPressMask|ButtonReleaseMask|KeyPressMask|KeyReleaseMask);	
		xwindow=window;
		bbSetSystemWindow(xwindow);
	}

	/* Added by BaH */
	/* set the window title */
	XStoreName(xdisplay, window, _appTitle());
	
	bbSystemPoll();

	BBGLContext *bbcontext=(BBGLContext*)malloc( sizeof(BBGLContext) );
	memset( bbcontext,0,sizeof(BBGLContext) );
	bbcontext->mode=displaymode;	
	bbcontext->width=width;	
	bbcontext->height=height;	
	bbcontext->depth=24;	
	bbcontext->hertz=hz;
	bbcontext->flags=flags;
	bbcontext->sync=-1;	
	bbcontext->window=window;
	bbcontext->glContext=context;
	return bbcontext;
}

void bbGLGraphicsSetGraphics( BBGLContext *context ){
	if( context ){
		_validateSize( context );
		_validateContext( context );
	}
	if( !context || context==_currentContext ) return;
	_makeCurrent(context);
	_activeContext=context;
}

void bbGLGraphicsFlip( int sync ){
	if( !_currentContext ) return;
	sync=sync ? 1 : 0;
	if( sync!=_currentContext->sync ){
		_currentContext->sync=sync;
		if ( glXSwapIntervalEXT ) {
			 glXSwapIntervalEXT( sync );
		}
	}
	_swapBuffers( _currentContext );
}

void bbGLGraphicsClose( BBGLContext *context ){
	if (context){
		if (_currentContext==context) _currentContext=0;
		if (context->glContext) 
		{
			glXMakeCurrent(xdisplay,None,NULL);
			glXDestroyContext(xdisplay,context->glContext);	
		}
		if (context->window && context->mode!=MODE_WIDGET){
			XDestroyWindow(xdisplay,context->window);
		}
		if (context->mode==MODE_DISPLAY){
			XF86VidModeSwitchToMode(xdisplay,xscreen,&_oldMode);
			XF86VidModeSetViewPort(xdisplay,xscreen,0,0);
			XFlush(xdisplay);
			XFree(modes);
			modes=0;
			mode=0;
			xfullscreen=0;
		}
		free( context );
	}
}

void bbGLExit(){
	bbGLGraphicsClose( _currentContext );
	bbGLGraphicsClose( _sharedContext );
	_currentContext=0;
	_sharedContext=0;
}
...see "/* Added by BaH */" for places where code was changed.

:o)