loadtextureblockmipmap.c
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/**************************************************************************
* *
* Copyright (C) 1994, Silicon Graphics, Inc. *
* *
* These coded instructions, statements, and computer programs contain *
* unpublished proprietary information of Silicon Graphics, Inc., and *
* are protected by Federal copyright law. They may not be disclosed *
* to third parties or copied or duplicated in any form, in whole or *
* in part, without the prior written consent of Silicon Graphics, Inc. *
* *
**************************************************************************/
/****************************************************************************
* NOTE: To view this file correctly, set tabstop=3
*****************************************************************************/
#include "guint.h"
#include "ultra64.h"
#define TRAM_SIZE 4096 /* in bytes */
#define TRAM_WSIZE 8 /* TRAM word size in bytes */
#define TRAM_LSIZE 8 /* TRAM load word size in bytes */
#define MM_MAX_LEVEL 7 /* number of mipmap levels 0 to MM_MAX_LEVEL */
#define MM_MIN_SIZE 1 /* smallest mipmap tile */
struct texelSizeParams
{
unsigned char gran;
unsigned char shift;
unsigned char tsize;
unsigned char shiftr;
};
/* texture ram tile */
struct Tile
{
int w; /* width of tile in texels, padded to tram line sz */
int s, t; /* size of tile in texels */
int addr; /* address in tram of tile */
};
/* tram mipmaps */
static struct Tile mipmap[MM_MAX_LEVEL+1];
static struct texelSizeParams sizeParams[4] =
{ 16, 3, 1, 0,
8, 2, 2, 1,
4, 1, 4, 2,
2, 0, 8, 3
};
static int max_mipmap;
static unsigned char *tram;
static int txlsize;
static int errNo = 0;
static int NA = 0; /* Not applicable */
static unsigned int length; /* total texels in mipmap */
static int level; /* total levels in mipmap */
static void get3x3(struct Tile *tile, int *s, int *t, int *texel, int shift, int size);
static void stuffDisplayList(Gfx **glistp, Image *im, char *tbuf, unsigned char startTile,
unsigned char pal, unsigned char cms, unsigned char cmt,
unsigned char masks, unsigned char maskt, unsigned char shifts,
unsigned char shiftt);
static void kernel(int i, int r1, int g1, int b1, int a1, float *r2, float *g2,
float *b2, float *a2);
#define unpack_ia16(c,i,a) \
i = (c & 0xff00) >> 8, a = (c & 0xff)
#define pack_ia16(i,a) \
(i << 8) | a
#define unpack_ia8(c,i,a) \
i = ((c & 0xf0) >> 4), a = (c & 0xf)
#define pack_ia8(i,a) \
(a & 0xf) | ((i & 0xf) << 4)
#define unpack_ia4(c,i,a) \
i = ((c & 0xe) >> 1), a = (c & 0x1)
#define pack_ia4(i,a) \
((i & 0x7) << 1) | ((a & 0x1))
#define unpack_i4(c,i) \
i = (c & 0xf)
#define pack_i4(i) \
(i)
#define unpack_i8(c,i) \
i = (c & 0xff)
#define pack_i8(i) \
(i)
#define unpack_ci8(c,ci) unpack_i8(c,ci)
#define pack_ci8(ci) pack_i8(ci)
#define unpack_ci4(c,ci) unpack_i4(c,ci)
#define pack_ci4(ci) pack_i4(ci)
#define unpack_rgba(c,r,g,b,a) \
(r = (c & 0xf800) >> 11), g = ((c & 0x07c0) >> 6), b = ((c & 0x003e) >> 1), \
a = (c & 0x1)
#define pack_rgba( r, g, b, a) ((r&0x1f) << 11) | (g&0x1f) << 6 | \
((b&0x1f) << 1) | (a)
/*************************************************************************
* Generates all levels of a power-of-two mipmap from an input array. *
* Also stuffs display list with entries for loading and rendering the *
* texture. Filtering Color-Index maps makes sense only if the lookup *
* is a linear ramp. Billboards and trees cutout using alpha will change *
* shape as the level changes due to change in map resolution. Texel *
* formats with only one bit of alpha will not be filtered very well. *
*************************************************************************
* ErrNo value error description *
*-----------------------------------------------------------------------*
* 1 Mipmap too big to load into tmem. Not Fatal, *
* will load as many levels as there is space for. *
* *
* 2 Texel format not supported, Fatal error *
************************************************************************/
int guLoadTextureBlockMipMap(Gfx **glistp, unsigned char *tbuf, Image *im,
unsigned char startTile, unsigned char pal, unsigned char cms, unsigned char cmt,
unsigned char masks, unsigned char maskt, unsigned char shifts, unsigned char shiftt,
unsigned char cfs, unsigned char cft)
{
unsigned char *iaddr, *taddr;
int im_bytes, tr_bytes;
int h, b;
int flip;
char startUnAligned;
char endUnAligned;
txlsize = sizeParams[im->siz].tsize; /* texel size in nibbles */
/* to next line size */
/*
* Do top level map, swizzle bytes on odd t's *
*/
/* base char address of tile to be loaded */
iaddr = ((im->t * im->lsize)+((im->s * txlsize) >> 1) + im->base);
/*check tile line starting and ending alignments along 4bit bndries */
startUnAligned = ((im->s & 0x1) && (im->siz == G_IM_SIZ_4b));
endUnAligned = (((im->s + im->w) & 0x1) && (im->siz == G_IM_SIZ_4b));
im_bytes = ((im->w * txlsize + 1) >> 1); /* siz of 1 tile line in bytes */
tr_bytes = im_bytes / TRAM_LSIZE; /* no of tram lines per tile line */
tr_bytes = tr_bytes * TRAM_LSIZE; /* tile line size in bytes */
if (im_bytes > tr_bytes) tr_bytes += TRAM_LSIZE;
taddr = &tbuf[im->addr]; /* why ? make this zero?*/
if (startUnAligned)
{
for (h=0; h<im->h; h++)
{
flip = (h & 1) << 2; /*shift does not depend on txlsize*/
for (b=0; b<im_bytes; b++)
{
*(taddr+(b^flip)) = ((*(iaddr+b) & 0x0f) << 4)
| ((*(iaddr+b+1) & 0xf0) >> 4);
}
/* add last aligned nibble */
if (!endUnAligned) *(taddr+((b-1)^flip)) &= (0xf0);
/* pickup trailing bytes */
for (b=im_bytes; b<tr_bytes; b++) *(taddr+(b^flip)) = 0;
iaddr += im->lsize;
taddr += tr_bytes;
}
}
else /* if start aligned */
{
for (h=0; h<im->h; h++)
{
flip = (h & 1) << 2; /*shift does not depend on txlsize*/
for (b=0; b<im_bytes; b++)
*(taddr+(b^flip)) = *(iaddr+b);
/* zero out last extra nibble */
if (endUnAligned) *(taddr+((b-1)^flip)) &= (0xf0);
/* pad trailing bytes with zeroes */
for (b=im_bytes; b<tr_bytes; b++) *(taddr+(b^flip)) = 0;
iaddr += im->lsize;
taddr += tr_bytes;
}
}
tram = tbuf;
/* save tile attributes in top mipmap */
mipmap[0].s = im->w; /* tile width */
mipmap[0].t = im->h; /* tile height */
/* guaranteed no remainder ? */
mipmap[0].w = ((tr_bytes / txlsize) << 1); /* tile line width in texels*/
mipmap[0].addr = im->addr;
max_mipmap = MM_MAX_LEVEL;
length = mipmap[0].w*mipmap[0].t; /* total texels in level 0 */
/**
rmonPrintf("level0 w,t,l = %d %d %d\n",mipmap[0].w, mipmap[0].t,length);
***/
/******************************************************************************
Generate other levels of mipmap using a box filter
******************************************************************************/
{/* generate mip map for this tile */
unsigned char *taddr, *saddr;
int shift = (int) sizeParams[im->siz].shift;
int s, t, si, ti, sii, tii;
int s4[9];
int t4[9];
int tex4[9];
int r0, g0, b0, a0, r1, g1, b1, a1;
float r2 ,g2, b2, a2;
float dummy;
int i0, ci0, ia0, i1, ci1, ia1;
float i2, ci2, ia2;
int texel;
int i,trip;
unsigned int tempaddr;
int ntexels = ((TRAM_LSIZE/txlsize) << 1); /* texels per line */
level = 0; /* need to check for memory overflow */
while ((mipmap[level].s > 1) || (mipmap[level].t > 1))
{
level++;
/*
* set new mipmap level address in bytes
*/
mipmap[level].addr = mipmap[level-1].addr +
(mipmap[level-1].w * txlsize * mipmap[level-1].t >> 1);
/*
* grab location in tram pointing to the current level address
*/
taddr = &(tram[ mipmap[level].addr ]);
/*
* downfilter by 2X, bump odd size
* compute parameters for new mipmap level
*/
mipmap[level].s = (mipmap[0].s) >> level;
mipmap[level].t = (mipmap[0].t) >> level;
if (mipmap[level].s == 0) mipmap[level].s = 1;
if (mipmap[level].t == 0) mipmap[level].t = 1;
/*
* width must be a multiple of 8 bytes (padding for tram line size)
*/
mipmap[level].w =
((mipmap[level].s + (ntexels -1)) >> (shift +1) << (shift +1));
/*
* compute total no of texels to be loaded
*/
length += mipmap[level].w*mipmap[level].t;
/**
rmonPrintf("level, w,t,l = %d %d %d %d\n", level, mipmap[level].w, mipmap[level].t,length);
**/
if ((length*txlsize >> 1) >= TRAM_SIZE)
{
errNo = 1;
length -= mipmap[level].w*mipmap[level].t;
break;
}
/*
* for each scanline
*/
for (t=0; t<mipmap[level-1].t; t+=2)
{
flip = 0;
trip = (t & 2) << 1; /* invert bit 4 on odd line */
ti = t + 1;
tii = t - 1;
/*
* check filtering clamp/wrap flag and do accordingly
*/
if ( cft) {
if (ti >= mipmap[level-1].t) ti = t;
if (tii < 0) tii = t;
} else {
if (ti >= mipmap[level-1].t) ti = 0;
if (tii < 0) tii = mipmap[level-1].t - 1;
}
tempaddr = 0;
for (s=0; s<mipmap[level-1].s; s+=2)
{
si = s + 1;
sii = s - 1;
/*
* duplicate last texel for odd sizes for filtering
*/
if (cfs) {
if (si >= mipmap[level-1].s) si = s;
if (sii < 0) sii = s;
} else {
if (si >= mipmap[level-1].s) si = 0;
if (sii < 0) sii = mipmap[level-1].s - 1;
}
/***
if (level == 6)
rmonPrintf("sts = %d %d %d %d %d %d\n",
s, si, sii, t, ti, tii);
***/
/*
* grab the nine neighbours to apply kernel function
*/
s4[0] = s; t4[0] = tii;
s4[1] = si; t4[1] = tii;
s4[2] = si; t4[2] = t;
s4[3] = si; t4[3] = ti;
s4[4] = s; t4[4] = ti;
s4[5] = sii; t4[5] = ti;
s4[6] = sii; t4[6] = t;
s4[7] = sii; t4[7] = tii;
s4[8] = s; t4[8] = t;
get3x3( &mipmap[level-1], s4, t4, tex4, shift, im->siz);
saddr = taddr + ((tempaddr >> 1)^trip);
r1 = g1 = b1 = a1 = ci1 = i1 = 0;
r2 = g2 = b2 = a2 = ci2 = i2 = 0;
/*
* Extract R,G and B components of the 9 texels and
* apply the filter kernel
*/
switch (im->fmt)
{
case (G_IM_FMT_RGBA):
if (im->siz == G_IM_SIZ_16b)
{
for (i=0; i< 9; i++)
{
unpack_rgba(tex4[i], r0, g0, b0, a0);
kernel(i, r0, g0, b0, a0, &r2, &g2, &b2, &a2);
/***
if (level == 6)
rmonPrintf("r0, g0, b0, a0 = %d %d %d %d\n",
r0, g0, b0, a0);
**/
}
r1 = (int)(r2/16.0 + 0.5);
g1 = (int)(g2/16.0 + 0.5);
b1 = (int)(b2/16.0 + 0.5);
a1 = (int)(a2/16.0 + 0.5);
}
else
{
/*
* RGBA32 is not supported
*/
errNo = 2;
return errNo;
}
break;
case (G_IM_FMT_YUV):
errNo = 2;
return errNo;
break;
case (G_IM_FMT_CI):
if (im->siz == G_IM_SIZ_4b)
{
for (i=0; i<9; i++)
{
unpack_ci4(tex4[i],ci0);
kernel(i, ci0, 0, 0, 0, &ci2, &dummy, &dummy,
&dummy);
}
ci1 = (int)(ci2/16.0 + 0.5);
}
else
if (im->siz == G_IM_SIZ_8b)
{
for (i=0; i<9; i++)
{
unpack_ci8(tex4[i],ci0);
kernel(i, ci0, 0, 0, 0, &ci2, &dummy,
&dummy, &dummy);
}
ci1 = (int)(ci2/16.0 + 0.5);
}
else
{
errNo=2;
return errNo;
}
break;
case (G_IM_FMT_IA):
if (im->siz == G_IM_SIZ_4b)
{
for (i=0; i<9; i++)
{
unpack_ia4(tex4[i],i0,a0);
kernel(i, i0, a0, 0, 0, &i2, &a2, &dummy,
&dummy);
}
i1 = (int)(i2/16.0 +0.5);
a1 = (int)(a2/16.0 +0.5);
}
else if (im->siz == G_IM_SIZ_8b)
{
for (i=0; i<9; i++)
{
unpack_ia8(tex4[i],i0,a0);
kernel(i, i0, a0, 0, 0, &i2, &a2, &dummy,
&dummy);
}
i1 = (int)(i2/16.0 +0.5);
a1 = (int)(a2/16.0 +0.5);
}
else
if (im->siz == G_IM_SIZ_16b)
{
for (i=0; i<9; i++)
{
unpack_ia16(tex4[i],i0,a0);
kernel(i, i0, a0, 0, 0, &i2, &a2, &dummy,
&dummy);
}
i1 = (int)(i2/16.0 +0.5);
a1 = (int)(a2/16.0 +0.5);
}
else
{
errNo = 2;
return errNo;
}
break;
case (G_IM_FMT_I):
if (im->siz == G_IM_SIZ_4b)
{
for (i=0; i<9; i++)
{
unpack_i4(tex4[i],i0);
kernel(i, i0, 0, 0, 0, &i2, &dummy, &dummy,
&dummy);
}
i1 = (int)(i2/16.0 + 0.5);
}
else
if (im->siz == G_IM_SIZ_8b)
{
for (i=0; i<9; i++)
{
unpack_i8(tex4[i],i0);
kernel(i, i0, 0, 0, 0, &i2, &dummy, &dummy,
&dummy);
}
i1 = (int)(i2/16.0 +0.5);
}
else
{
errNo = 2;
return errNo;
}
default:
break;
}
/*
* Pack fields into destination texel
*/
switch (im->fmt)
{
case (G_IM_FMT_RGBA):
texel = pack_rgba(r1,g1,b1,a1);
*(short *)((int)saddr^flip) = texel;
break;
case (G_IM_FMT_YUV):
break;
case (G_IM_FMT_CI):
if (im->siz == G_IM_SIZ_4b)
{
texel = pack_ci4(ci1);
*(char *)((int)saddr^flip) |= (s & 0x2)?
(texel): (texel << 4);
}
else
if (im->siz == G_IM_SIZ_8b)
{
texel = pack_ci8(ci1);
*(char *)((int)saddr^flip) = texel;
}
break;
case (G_IM_FMT_IA):
if (im->siz == G_IM_SIZ_4b)
{
texel = pack_ia4(i1,a1);
*(char *)((int)saddr^flip) |= (s & 0x2)?
(texel): (texel << 4);
}
else
if (im->siz == G_IM_SIZ_8b)
{
texel = pack_ia8(i1,a1);
*(char *)((int)saddr^flip) = texel;
}
else
if (im->siz == G_IM_SIZ_16b)
{
texel = pack_ia16(i1,a1);
*(short *)((int)saddr^flip) = texel;
}
break;
case (G_IM_FMT_I):
if (im->siz == G_IM_SIZ_4b)
{
texel = pack_i4(i1);
*(char *)((int)saddr^flip) |= (s & 0x2)?
(texel): (texel << 4);
}
else
if (im->siz == G_IM_SIZ_8b)
{
texel = pack_i8(i1);
*(char *)((int)saddr^flip) = texel;
}
break;
}
tempaddr += txlsize;
} /* end s */
taddr += ((mipmap[level].w * txlsize) >> 1);
} /* end t */
if (mipmap[level].s <= MM_MIN_SIZE &&
mipmap[level].t <= MM_MIN_SIZE)
{
max_mipmap = level;
break;
}
} /* end level */
}/* end generate mipmap */
/*
* Add entries for texture loading and rendering in DL
*/
stuffDisplayList(glistp, im, tbuf, startTile, pal, cms, cmt, masks, maskt, shifts, shiftt);
return errNo;
} /* end guLoadTextureBlockMipMap */
/******************************************************************************
*
* Apply Kernel :
* 1 2 1
* 2 4 1
* 1 2 1
******************************************************************************/
static void kernel(int i, int r0, int g0, int b0, int a0, float *r2, float *g2, float *b2, float *a2)
{
if (i == 8)
{
*r2 += r0*4; *g2 += g0*4; *b2 += b0*4; *a2 += a0*4;
} else
if (i%2 == 0)
{
*r2 += r0*2;
*g2 += g0*2;
*b2 += b0*2;
*a2 += a0*2;
} else
{
*r2 += r0;
*g2 += g0;
*b2 += b0;
*a2 += a0;
}
}
/********************************************************************
Add entries for loading and rendering textures into the display list
*********************************************************************/
static void stuffDisplayList(Gfx **glistp, Image *im, char *tbuf, unsigned char startTile,
unsigned char pal, unsigned char cms, unsigned char cmt,
unsigned char masks, unsigned char maskt, unsigned char shifts,
unsigned char shiftt)
{
int tile;
int Smask, Tmask;
int Sshift, Tshift;
/*
* set LOADTILE for loading texture
* 4-bit textures are loaded in 8-bit chunks
*/
if (im->siz == G_IM_SIZ_4b) {
gDPSetTextureImage((*glistp)++, im->fmt, G_IM_SIZ_8b, 1,
osVirtualToPhysical((unsigned short *)tbuf));
gDPSetTile((*glistp)++, im->fmt, G_IM_SIZ_8b, NA, 0, G_TX_LOADTILE, NA,
NA, NA, NA, NA, NA, NA);
/* Wait until all primitives are done */
gDPLoadSync((*glistp)++);
gDPLoadBlock((*glistp)++, G_TX_LOADTILE, 0, 0, length/2, 0x0);
} else {
gDPSetTextureImage((*glistp)++, im->fmt, im->siz, 1,
osVirtualToPhysical((unsigned short *)tbuf));
gDPSetTile((*glistp)++, im->fmt, im->siz, NA, 0, G_TX_LOADTILE, NA,
NA, NA, NA, NA, NA, NA);
/* Wait until all primitives are done */
gDPLoadSync((*glistp)++);
gDPLoadBlock((*glistp)++, G_TX_LOADTILE, 0, 0, length, 0x0);
}
for (tile = 0; tile <= level; tile ++)
{
Tmask = maskt-tile;
if (Tmask < 0){
Tmask = 0;
} else {
Tshift = tile;
}
Smask = masks-tile;
if (Smask < 0){
Smask = 0;
} else {
Sshift = tile;
}
/***
rmonPrintf("tile, Tmask, Tshift, Smask, Sshift %d %d %d %d %d\n",
tile, Tmask, Tshift, Smask, Sshift);
rmonPrintf("%d\n",startTile);
***/
gDPSetTile((*glistp)++,im->fmt, im->siz, (mipmap[tile].w*txlsize >> 4),
(mipmap[tile].addr >> 3), tile+startTile, pal, cmt, Tmask, Tshift, cms,
Smask, Sshift);
gDPSetTileSize((*glistp)++,tile+startTile, (0 <<G_TEXTURE_IMAGE_FRAC),
(0 <<G_TEXTURE_IMAGE_FRAC), (mipmap[tile].s-1) <<G_TEXTURE_IMAGE_FRAC,
(mipmap[tile].t-1) << G_TEXTURE_IMAGE_FRAC);
}
}
/******************************************************************************
Extract quad of texels for filtering. Compute bank and row addresses.
******************************************************************************/
static void get3x3(struct Tile *tile, int *s, int *t, int *texel, int shift, int size)
{
int i;
int bank, row;
unsigned int addr;
int overlap;
unsigned char r, g, b, a;
unsigned long tex;
struct Image *im;
unsigned int ss,tt;
for (i=0; i< 9; i++)
{
ss = s[i];
tt = t[i];
/* bank and row indexing */
bank = (((ss & (0x3 << (shift-1))) >> (shift-1)) ^ ((tt & 0x1) << 1)) << 1;
row = (((tt * tile->w + ss) * txlsize) >> 1) / TRAM_LSIZE;
addr = tile->addr + row * TRAM_WSIZE + bank;
overlap = (i == 0) ? bank : overlap ^ bank;
switch (size)
{
case G_IM_SIZ_4b:
texel[i] = (tram[addr + ((ss & 0x2) >> 1)]
& (0xf0 >> ((ss & 0x1) << 2)));
if (!(ss & 0x1)) texel[i] = texel[i] >> 4;
break;
case G_IM_SIZ_8b:
texel[i] = tram[addr + (ss & 0x1)];
break;
case G_IM_SIZ_16b:
texel[i] = (tram[addr] << 8) | tram[addr+1];
break;
case G_IM_SIZ_32b:
errNo = 2; /* Format not supported */
break;
default:
break;
}
}
}