r_misc.c

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

	r_refdef.horizontalFieldOfView = 2*tan((float)r_newrefdef.fov_x/360*M_PI);;
	verticalFieldOfView = 2*tan((float)r_newrefdef.fov_y/360*M_PI);

	r_refdef.fvrectx = (float)r_refdef.vrect.x;
	r_refdef.fvrectx_adj = (float)r_refdef.vrect.x - 0.5;
	r_refdef.vrect_x_adj_shift20 = (r_refdef.vrect.x<<20) + (1<<19) - 1;
	r_refdef.fvrecty = (float)r_refdef.vrect.y;
	r_refdef.fvrecty_adj = (float)r_refdef.vrect.y - 0.5;
	r_refdef.vrectright = r_refdef.vrect.x + r_refdef.vrect.width;
	r_refdef.vrectright_adj_shift20 = (r_refdef.vrectright<<20) + (1<<19) - 1;
	r_refdef.fvrectright = (float)r_refdef.vrectright;
	r_refdef.fvrectright_adj = (float)r_refdef.vrectright - 0.5;
	r_refdef.vrectrightedge = (float)r_refdef.vrectright - 0.99;
	r_refdef.vrectbottom = r_refdef.vrect.y + r_refdef.vrect.height;
	r_refdef.fvrectbottom = (float)r_refdef.vrectbottom;
	r_refdef.fvrectbottom_adj = (float)r_refdef.vrectbottom - 0.5;

	r_refdef.aliasvrect.x = (int)(r_refdef.vrect.x * r_aliasuvscale);
	r_refdef.aliasvrect.y = (int)(r_refdef.vrect.y * r_aliasuvscale);
	r_refdef.aliasvrect.width = (int)(r_refdef.vrect.width * r_aliasuvscale);
	r_refdef.aliasvrect.height = (int)(r_refdef.vrect.height * r_aliasuvscale);
	r_refdef.aliasvrectright = r_refdef.aliasvrect.x +
			r_refdef.aliasvrect.width;
	r_refdef.aliasvrectbottom = r_refdef.aliasvrect.y +
			r_refdef.aliasvrect.height;

	xOrigin = r_refdef.xOrigin;
	yOrigin = r_refdef.yOrigin;
	
// values for perspective projection
// if math were exact, the values would range from 0.5 to to range+0.5
// hopefully they wll be in the 0.000001 to range+.999999 and truncate
// the polygon rasterization will never render in the first row or column
// but will definately render in the [range] row and column, so adjust the
// buffer origin to get an exact edge to edge fill
	xcenter = ((float)r_refdef.vrect.width * XCENTERING) +
			r_refdef.vrect.x - 0.5;
	aliasxcenter = xcenter * r_aliasuvscale;
	ycenter = ((float)r_refdef.vrect.height * YCENTERING) +
			r_refdef.vrect.y - 0.5;
	aliasycenter = ycenter * r_aliasuvscale;

	xscale = r_refdef.vrect.width / r_refdef.horizontalFieldOfView;
	aliasxscale = xscale * r_aliasuvscale;
	xscaleinv = 1.0 / xscale;

	yscale = xscale;
	aliasyscale = yscale * r_aliasuvscale;
	yscaleinv = 1.0 / yscale;
	xscaleshrink = (r_refdef.vrect.width-6)/r_refdef.horizontalFieldOfView;
	yscaleshrink = xscaleshrink;

// left side clip
	screenedge[0].normal[0] = -1.0 / (xOrigin*r_refdef.horizontalFieldOfView);
	screenedge[0].normal[1] = 0;
	screenedge[0].normal[2] = 1;
	screenedge[0].type = PLANE_ANYZ;
	
// right side clip
	screenedge[1].normal[0] =
			1.0 / ((1.0-xOrigin)*r_refdef.horizontalFieldOfView);
	screenedge[1].normal[1] = 0;
	screenedge[1].normal[2] = 1;
	screenedge[1].type = PLANE_ANYZ;
	
// top side clip
	screenedge[2].normal[0] = 0;
	screenedge[2].normal[1] = -1.0 / (yOrigin*verticalFieldOfView);
	screenedge[2].normal[2] = 1;
	screenedge[2].type = PLANE_ANYZ;
	
// bottom side clip
	screenedge[3].normal[0] = 0;
	screenedge[3].normal[1] = 1.0 / ((1.0-yOrigin)*verticalFieldOfView);
	screenedge[3].normal[2] = 1;	
	screenedge[3].type = PLANE_ANYZ;
	
	for (i=0 ; i<4 ; i++)
		VectorNormalize (screenedge[i].normal);

	D_ViewChanged ();
}


/*
===============
R_SetupFrame
===============
*/
void R_SetupFrame (void)
{
	int			i;
	vrect_t		vrect;

	if (r_fullbright->modified)
	{
		r_fullbright->modified = false;
		D_FlushCaches ();	// so all lighting changes
	}
	
	r_framecount++;


// build the transformation matrix for the given view angles
	VectorCopy (r_refdef.vieworg, modelorg);
	VectorCopy (r_refdef.vieworg, r_origin);

	AngleVectors (r_refdef.viewangles, vpn, vright, vup);

// current viewleaf
	if ( !( r_newrefdef.rdflags & RDF_NOWORLDMODEL ) )
	{
		r_viewleaf = Mod_PointInLeaf (r_origin, r_worldmodel);
		r_viewcluster = r_viewleaf->cluster;
	}

	if (sw_waterwarp->value && (r_newrefdef.rdflags & RDF_UNDERWATER) )
		r_dowarp = true;
	else
		r_dowarp = false;

	if (r_dowarp)
	{	// warp into off screen buffer
		vrect.x = 0;
		vrect.y = 0;
		vrect.width = r_newrefdef.width < WARP_WIDTH ? r_newrefdef.width : WARP_WIDTH;
		vrect.height = r_newrefdef.height < WARP_HEIGHT ? r_newrefdef.height : WARP_HEIGHT;

		d_viewbuffer = r_warpbuffer;
		r_screenwidth = WARP_WIDTH;
	}
	else
	{
		vrect.x = r_newrefdef.x;
		vrect.y = r_newrefdef.y;
		vrect.width = r_newrefdef.width;
		vrect.height = r_newrefdef.height;

		d_viewbuffer = (void *)vid.buffer;
		r_screenwidth = vid.rowbytes;
	}
	
	R_ViewChanged (&vrect);

// start off with just the four screen edge clip planes
	R_TransformFrustum ();
	R_SetUpFrustumIndexes ();

// save base values
	VectorCopy (vpn, base_vpn);
	VectorCopy (vright, base_vright);
	VectorCopy (vup, base_vup);

// clear frame counts
	c_faceclip = 0;
	d_spanpixcount = 0;
	r_polycount = 0;
	r_drawnpolycount = 0;
	r_wholepolycount = 0;
	r_amodels_drawn = 0;
	r_outofsurfaces = 0;
	r_outofedges = 0;

// d_setup
	d_roverwrapped = false;
	d_initial_rover = sc_rover;

	d_minmip = sw_mipcap->value;
	if (d_minmip > 3)
		d_minmip = 3;
	else if (d_minmip < 0)
		d_minmip = 0;

	for (i=0 ; i<(NUM_MIPS-1) ; i++)
		d_scalemip[i] = basemip[i] * sw_mipscale->value;

	d_aflatcolor = 0;
}


#if	!id386

/*
================
R_SurfacePatch
================
*/
void R_SurfacePatch (void)
{
	// we only patch code on Intel
}

#endif	// !id386


/* 
============================================================================== 
 
						SCREEN SHOTS 
 
============================================================================== 
*/ 


/* 
============== 
WritePCXfile 
============== 
*/ 
void WritePCXfile (char *filename, byte *data, int width, int height,
	int rowbytes, byte *palette) 
{
	int			i, j, length;
	pcx_t		*pcx;
	byte		*pack;
	FILE		*f;

	pcx = (pcx_t *)malloc (width*height*2+1000);
	if (!pcx)
		return;

	pcx->manufacturer = 0x0a;	// PCX id
	pcx->version = 5;			// 256 color
 	pcx->encoding = 1;		// uncompressed
	pcx->bits_per_pixel = 8;		// 256 color
	pcx->xmin = 0;
	pcx->ymin = 0;
	pcx->xmax = LittleShort((short)(width-1));
	pcx->ymax = LittleShort((short)(height-1));
	pcx->hres = LittleShort((short)width);
	pcx->vres = LittleShort((short)height);
	memset (pcx->palette,0,sizeof(pcx->palette));
	pcx->color_planes = 1;		// chunky image
	pcx->bytes_per_line = LittleShort((short)width);
	pcx->palette_type = LittleShort(2);		// not a grey scale
	memset (pcx->filler,0,sizeof(pcx->filler));

// pack the image
	pack = &pcx->data;
	
	for (i=0 ; i<height ; i++)
	{
		for (j=0 ; j<width ; j++)
		{
			if ( (*data & 0xc0) != 0xc0)
				*pack++ = *data++;
			else
			{
				*pack++ = 0xc1;
				*pack++ = *data++;
			}
		}

		data += rowbytes - width;
	}
			
// write the palette
	*pack++ = 0x0c;	// palette ID byte
	for (i=0 ; i<768 ; i++)
		*pack++ = *palette++;
		
// write output file 
	length = pack - (byte *)pcx;
	f = fopen (filename, "wb");
	if (!f)
		ri.Con_Printf (PRINT_ALL, "Failed to open to %s\n", filename);
	else
	{
		fwrite ((void *)pcx, 1, length, f);
		fclose (f);
	}

	free (pcx);
} 
 


/* 
================== 
R_ScreenShot_f
================== 
*/  
void R_ScreenShot_f (void) 
{ 
	int			i; 
	char		pcxname[80]; 
	char		checkname[MAX_OSPATH];
	FILE		*f;
	byte		palette[768];

	// create the scrnshots directory if it doesn't exist
	Com_sprintf (checkname, sizeof(checkname), "%s/scrnshot", ri.FS_Gamedir());
	Sys_Mkdir (checkname);

// 
// find a file name to save it to 
// 
	strcpy(pcxname,"quake00.pcx");
		
	for (i=0 ; i<=99 ; i++) 
	{ 
		pcxname[5] = i/10 + '0'; 
		pcxname[6] = i%10 + '0'; 
		Com_sprintf (checkname, sizeof(checkname), "%s/scrnshot/%s", ri.FS_Gamedir(), pcxname);
		f = fopen (checkname, "r");
		if (!f)
			break;	// file doesn't exist
		fclose (f);
	} 
	if (i==100) 
	{
		ri.Con_Printf (PRINT_ALL, "R_ScreenShot_f: Couldn't create a PCX"); 
		return;
	}

	// turn the current 32 bit palette into a 24 bit palette
	for (i=0 ; i<256 ; i++)
	{
		palette[i*3+0] = sw_state.currentpalette[i*4+0];
		palette[i*3+1] = sw_state.currentpalette[i*4+1];
		palette[i*3+2] = sw_state.currentpalette[i*4+2];
	}

// 
// save the pcx file 
// 

	WritePCXfile (checkname, vid.buffer, vid.width, vid.height, vid.rowbytes,
				  palette);

	ri.Con_Printf (PRINT_ALL, "Wrote %s\n", checkname);
}