Initial import of the new Q2PRO tree.

1 files changed, 438 insertions, 0 deletions

diff --git a/source/sw_surf.c b/source/sw_surf.c
new file mode 100644
index 0000000..f8633bc
--- /dev/null
+++ b/source/sw_surf.c
@@ -0,0 +1,438 @@
+/*
+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.
+
+*/
+// r_surf.c: surface-related refresh code
+
+#include "sw_local.h"
+
+drawsurf_t	r_drawsurf;
+
+int				lightleft, sourcesstep, blocksize, sourcetstep;
+int				lightdelta, lightdeltastep;
+int				lightright, lightleftstep, lightrightstep, blockdivshift;
+unsigned		blockdivmask;
+void			*prowdestbase;
+unsigned char	*pbasesource;
+int				surfrowbytes;	// used by ASM files
+unsigned		*r_lightptr;
+int				r_stepback;
+int				r_lightwidth;
+int				r_numhblocks, r_numvblocks;
+unsigned char	*r_source, *r_sourcemax;
+
+void R_DrawSurfaceBlock8_mip0 (void);
+void R_DrawSurfaceBlock8_mip1 (void);
+void R_DrawSurfaceBlock8_mip2 (void);
+void R_DrawSurfaceBlock8_mip3 (void);
+
+static void	(*surfmiptable[4])(void) = {
+	R_DrawSurfaceBlock8_mip0,
+	R_DrawSurfaceBlock8_mip1,
+	R_DrawSurfaceBlock8_mip2,
+	R_DrawSurfaceBlock8_mip3
+};
+
+void R_BuildLightMap (void);
+extern	blocklight_t		blocklights[MAX_BLOCKLIGHTS];	// allow some very large lightmaps
+
+float           surfscale;
+qboolean        r_cache_thrash;         // set if surface cache is thrashing
+
+int         sc_size;
+surfcache_t	*sc_rover, *sc_base;
+
+/*
+===============
+R_TextureAnimation
+
+Returns the proper texture for a given time and base texture
+===============
+*/
+image_t *R_TextureAnimation (mtexinfo_t *tex)
+{
+	int		c;
+
+	if (!tex->next)
+		return tex->image;
+
+	c = currententity->frame % tex->numframes;
+	while (c)
+	{
+		tex = tex->next;
+		c--;
+	}
+
+	return tex->image;
+}
+
+/*
+===============
+R_DrawSurface
+===============
+*/
+void R_DrawSurface( void ) {
+	byte		*basetptr;
+	int				smax, tmax, twidth;
+	int				u;
+	int				soffset, toffset;
+	int				horzblockstep;
+	byte		*pcolumndest;
+	void			(*pblockdrawer)(void);
+	image_t			*mt;
+
+	surfrowbytes = r_drawsurf.rowbytes;
+
+	mt = r_drawsurf.image;
+	
+	r_source = mt->pixels[r_drawsurf.surfmip];
+	
+// the fractional light values should range from 0 to (VID_GRADES - 1) << 16
+// from a source range of 0 - 255
+	
+	/* width in bytes */
+	twidth = ( mt->upload_width >> r_drawsurf.surfmip ) * VID_BYTES;
+
+	blocksize = 16 >> r_drawsurf.surfmip;
+	blockdivshift = 4 - r_drawsurf.surfmip;
+	blockdivmask = (1 << blockdivshift) - 1;
+	
+	r_lightwidth = ((r_drawsurf.surf->extents[0]>>4)+1)*LIGHTMAP_BYTES;
+
+	r_numhblocks = r_drawsurf.surfwidth >> blockdivshift;
+	r_numvblocks = r_drawsurf.surfheight >> blockdivshift;
+
+//==============================
+
+	pblockdrawer = surfmiptable[r_drawsurf.surfmip];
+// TODO: only needs to be set when there is a display settings change
+	horzblockstep = blocksize << VID_SHIFT;
+
+	smax = mt->upload_width >> r_drawsurf.surfmip;
+	tmax = mt->upload_height >> r_drawsurf.surfmip;
+	sourcetstep = twidth;
+	r_stepback = tmax * twidth;
+
+	r_sourcemax = r_source + ( tmax * smax * VID_BYTES );
+
+	soffset = r_drawsurf.surf->texturemins[0];
+	toffset = r_drawsurf.surf->texturemins[1];
+
+// << 16 components are to guarantee positive values for %
+	soffset = ((soffset >> r_drawsurf.surfmip) + (smax << 16)) % smax;
+	toffset = ((toffset >> r_drawsurf.surfmip) + (tmax << 16)) % tmax;
+
+	basetptr = &r_source[toffset * twidth];
+
+	pcolumndest = r_drawsurf.surfdat;
+
+	for( u = 0; u < r_numhblocks; u++ ) {
+		r_lightptr = ( unsigned * )blocklights + u * LIGHTMAP_BYTES;
+
+		prowdestbase = pcolumndest;
+
+		pbasesource = basetptr + ( soffset << VID_SHIFT );
+
+		(*pblockdrawer)();
+
+		soffset += blocksize;
+		if( soffset >= smax )
+			soffset = 0;
+
+		pcolumndest += horzblockstep;
+	}
+}
+
+//=============================================================================
+#if !USE_ASM
+
+#define BLOCK_FUNC R_DrawSurfaceBlock8_mip0
+#define BLOCK_SHIFT	4
+#include "sw_block.h"
+
+#define BLOCK_FUNC R_DrawSurfaceBlock8_mip1
+#define BLOCK_SHIFT	3
+#include "sw_block.h"
+
+#define BLOCK_FUNC R_DrawSurfaceBlock8_mip2
+#define BLOCK_SHIFT	2
+#include "sw_block.h"
+
+#define BLOCK_FUNC R_DrawSurfaceBlock8_mip3
+#define BLOCK_SHIFT	1
+#include "sw_block.h"
+
+#endif
+
+
+//============================================================================
+
+
+/*
+================
+R_InitCaches
+
+================
+*/
+void R_InitCaches (void)
+{
+	int		size;
+	int		pix;
+
+	// calculate size to allocate
+	if (sw_surfcacheoverride->integer)
+	{
+		size = sw_surfcacheoverride->integer;
+	}
+	else
+	{
+		size = SURFCACHE_SIZE_AT_320X240;
+
+		pix = vid.width*vid.height;
+		if (pix > 64000)
+			size += (pix-64000)*3;
+	}		
+
+	// round up to page size
+	size = (size + 8191) & ~8191;
+
+	Com_Printf("%ik surface cache\n", size/1024);
+
+	sc_size = size;
+	sc_base = (surfcache_t *)R_Malloc(size);
+	sc_rover = sc_base;
+	
+	sc_base->next = NULL;
+	sc_base->owner = NULL;
+	sc_base->size = sc_size;
+}
+
+
+/*
+==================
+D_FlushCaches
+==================
+*/
+void D_FlushCaches (void)
+{
+	surfcache_t     *c;
+	
+	if (!sc_base)
+		return;
+
+	for (c = sc_base ; c ; c = c->next)
+	{
+		if (c->owner){
+			*c->owner = NULL;
+		}
+	}
+	
+	sc_rover = sc_base;
+	sc_base->next = NULL;
+	sc_base->owner = NULL;
+	sc_base->size = sc_size;
+}
+
+/*
+=================
+D_SCAlloc
+=================
+*/
+surfcache_t     *D_SCAlloc (int width, int size)
+{
+	surfcache_t             *new;
+	qboolean                wrapped_this_time;
+
+	if ((width < 0) || (width > 256))
+		Com_Error (ERR_FATAL,"D_SCAlloc: bad cache width %d\n", width);
+
+	if ((size <= 0) || (size > 0x10000))
+		Com_Error (ERR_FATAL,"D_SCAlloc: bad cache size %d\n", size);
+	
+	size = (int)&((surfcache_t *)0)->data[size];
+	size = (size + 3) & ~3;
+	if (size > sc_size)
+		Com_Error (ERR_FATAL,"D_SCAlloc: %i > cache size of %i",size, sc_size);
+
+// if there is not size bytes after the rover, reset to the start
+	wrapped_this_time = qfalse;
+
+	if ( !sc_rover || (byte *)sc_rover - (byte *)sc_base > sc_size - size)
+	{
+		if (sc_rover)
+		{
+			wrapped_this_time = qtrue;
+		}
+		sc_rover = sc_base;
+	}
+		
+// colect and free surfcache_t blocks until the rover block is large enough
+	new = sc_rover;
+	if (sc_rover->owner)
+		*sc_rover->owner = NULL;
+	
+	while (new->size < size)
+	{
+	// free another
+		sc_rover = sc_rover->next;
+		if (!sc_rover)
+			Com_Error (ERR_FATAL,"D_SCAlloc: hit the end of memory");
+		if (sc_rover->owner)
+			*sc_rover->owner = NULL;
+			
+		new->size += sc_rover->size;
+		new->next = sc_rover->next;
+	}
+
+// create a fragment out of any leftovers
+	if (new->size - size > 256)
+	{
+		sc_rover = (surfcache_t *)( (byte *)new + size);
+		sc_rover->size = new->size - size;
+		sc_rover->next = new->next;
+		sc_rover->width = 0;
+		sc_rover->owner = NULL;
+		new->next = sc_rover;
+		new->size = size;
+	}
+	else
+		sc_rover = new->next;
+	
+	new->width = width;
+// DEBUG
+	if (width > 0)
+		new->height = (size - sizeof(*new) + sizeof(new->data)) / width;
+
+	new->owner = NULL;              // should be set properly after return
+
+	if (d_roverwrapped)
+	{
+		if (wrapped_this_time || (sc_rover >= d_initial_rover))
+			r_cache_thrash = qtrue;
+	}
+	else if (wrapped_this_time)
+	{       
+		d_roverwrapped = qtrue;
+	}
+
+	return new;
+}
+
+
+/*
+=================
+D_SCDump
+=================
+*/
+void D_SCDump_f (void)
+{
+	surfcache_t             *test;
+
+	for (test = sc_base ; test ; test = test->next)
+	{
+		if (test == sc_rover)
+			Com_Printf("ROVER:\n");
+		Com_Printf("%p : %i bytes     %i width\n", test, test->size,
+                test->width);
+	}
+}
+
+//=============================================================================
+
+/*
+================
+D_CacheSurface
+================
+*/
+surfcache_t *D_CacheSurface (msurface_t *surface, int miplevel)
+{
+	surfcache_t     *cache;
+
+//
+// if the surface is animating or flashing, flush the cache
+//
+	r_drawsurf.image = R_TextureAnimation (surface->texinfo);
+	r_drawsurf.lightadj[0] = r_newrefdef.lightstyles[surface->styles[0]].white*256;
+	r_drawsurf.lightadj[1] = r_newrefdef.lightstyles[surface->styles[1]].white*256;
+	r_drawsurf.lightadj[2] = r_newrefdef.lightstyles[surface->styles[2]].white*256;
+	r_drawsurf.lightadj[3] = r_newrefdef.lightstyles[surface->styles[3]].white*256;
+	
+//
+// see if the cache holds apropriate data
+//
+	cache = surface->cachespots[miplevel];
+
+	if (cache && !cache->dlight && surface->dlightframe != r_framecount
+			&& cache->image == r_drawsurf.image
+			&& cache->lightadj[0] == r_drawsurf.lightadj[0]
+			&& cache->lightadj[1] == r_drawsurf.lightadj[1]
+			&& cache->lightadj[2] == r_drawsurf.lightadj[2]
+			&& cache->lightadj[3] == r_drawsurf.lightadj[3] )
+		return cache;
+
+//
+// determine shape of surface
+//
+	surfscale = 1.0 / (1<<miplevel);
+	r_drawsurf.surfmip = miplevel;
+	r_drawsurf.surfwidth = surface->extents[0] >> miplevel;
+	r_drawsurf.rowbytes = r_drawsurf.surfwidth;
+	r_drawsurf.surfheight = surface->extents[1] >> miplevel;
+	
+//
+// allocate memory if needed
+//
+	if (!cache)     // if a texture just animated, don't reallocate it
+	{
+		cache = D_SCAlloc (r_drawsurf.surfwidth,
+						   r_drawsurf.surfwidth * r_drawsurf.surfheight);
+		surface->cachespots[miplevel] = cache;
+		cache->owner = &surface->cachespots[miplevel];
+		cache->mipscale = surfscale;
+	}
+	
+	if (surface->dlightframe == r_framecount)
+		cache->dlight = 1;
+	else
+		cache->dlight = 0;
+
+	r_drawsurf.surfdat = (pixel_t *)cache->data;
+	
+	cache->image = r_drawsurf.image;
+	cache->lightadj[0] = r_drawsurf.lightadj[0];
+	cache->lightadj[1] = r_drawsurf.lightadj[1];
+	cache->lightadj[2] = r_drawsurf.lightadj[2];
+	cache->lightadj[3] = r_drawsurf.lightadj[3];
+
+//
+// draw and light the surface texture
+//
+	r_drawsurf.surf = surface;
+
+	c_surf++;
+
+	// calculate the lightings
+	R_BuildLightMap ();
+	
+	// rasterize the surface into the cache
+	R_DrawSurface ();
+
+	return cache;
+}
+
+