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546 lines
12 KiB
C
546 lines
12 KiB
C
/*
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* UAE - The Un*x Amiga Emulator
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*
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* Common code needed by all the various graphics systems.
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*
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* (c) 1996 Bernd Schmidt, Ed Hanway, Samuel Devulder
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*/
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#include "sysconfig.h"
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#include "sysdeps.h"
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#include "custom.h"
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#include "xwin.h"
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#include "uae_endian.h"
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#define RED 0
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#define GRN 1
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#define BLU 2
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/*
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* dither matrix
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*/
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static uae_u8 dither[4][4] =
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{
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{ 0, 8, 2, 10 },
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{ 12, 4, 14, 6 },
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{ 3, 11, 1, 9 },
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{ 14 /* 15 */, 7, 13, 5 }
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};
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uae_u32 doMask (int p, int bits, int shift)
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{
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/* scale to 0..255, shift to align msb with mask, and apply mask */
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uae_u32 val = p << 24;
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if (!bits)
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return 0;
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val >>= (32 - bits);
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val <<= shift;
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return val;
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}
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int bits_in_mask (unsigned long mask)
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{
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int n = 0;
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while (mask) {
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n += mask & 1;
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mask >>= 1;
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}
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return n;
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}
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int mask_shift (unsigned long mask)
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{
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int n = 0;
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while (!(mask & 1)) {
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n++;
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mask >>= 1;
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}
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return n;
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}
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unsigned int doMask256 (int p, int bits, int shift)
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{
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/* p is a value from 0 to 255 (Amiga color value)
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* shift to align msb with mask, and apply mask */
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unsigned int val = p * 0x01010101UL;
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val >>= (32 - bits);
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val <<= shift;
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return val;
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}
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static unsigned int doColor (int i, int bits, int shift)
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{
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int shift2;
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if(bits >= 8) shift2 = 0; else shift2 = 8 - bits;
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return (i >> shift2) << shift;
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}
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static unsigned int doAlpha (int alpha, int bits, int shift)
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{
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return (alpha & ((1 << bits) - 1)) << shift;
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}
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void alloc_colors64k (int rw, int gw, int bw, int rs, int gs, int bs, int aw, int as, int alpha, int byte_swap)
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{
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unsigned int i;
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unsigned int bpp = rw + gw + bw + aw;
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for (i = 0; i < 4096; i++) {
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int r = ((i >> 8) << 4) | (i >> 8);
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int g = (((i >> 4) & 0xf) << 4) | ((i >> 4) & 0x0f);
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int b = ((i & 0xf) << 4) | (i & 0x0f);
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xcolors[i] = doMask(r, rw, rs) | doMask(g, gw, gs) | doMask(b, bw, bs) | doAlpha (alpha, aw, as);
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if (byte_swap) {
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if (bpp <= 16)
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xcolors[i] = bswap_16 (xcolors[i]);
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else
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xcolors[i] = bswap_32 (xcolors[i]);
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}
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if (bpp <= 16) {
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/* Fill upper 16 bits of each colour value
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* with a copy of the colour. */
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xcolors[i] = xcolors[i] * 0x00010001;
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}
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}
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#ifdef AGA
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/* create AGA color tables */
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for (i = 0; i < 256; i++) {
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xredcolors [i] = doColor (i, rw, rs) | doAlpha (alpha, aw, as);
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xgreencolors[i] = doColor (i, gw, gs) | doAlpha (alpha, aw, as);
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xbluecolors [i] = doColor (i, bw, bs) | doAlpha (alpha, aw, as);
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if (byte_swap) {
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if (bpp <= 16) {
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xredcolors [i] = bswap_16 (xredcolors[i]);
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xgreencolors[i] = bswap_16 (xgreencolors[i]);
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xbluecolors [i] = bswap_16 (xbluecolors[i]);
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} else {
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xredcolors [i] = bswap_32 (xredcolors[i]);
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xgreencolors[i] = bswap_32 (xgreencolors[i]);
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xbluecolors [i] = bswap_32 (xbluecolors[i]);
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}
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}
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if (bpp <= 16) {
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/* Fill upper 16 bits of each colour value with
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* a copy of the colour. */
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xredcolors [i] = xredcolors [i] * 0x00010001;
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xgreencolors[i] = xgreencolors[i] * 0x00010001;
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xbluecolors [i] = xbluecolors [i] * 0x00010001;
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}
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}
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#endif
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}
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static int color_diff[4096];
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static int newmaxcol = 0;
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void setup_maxcol (int max)
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{
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newmaxcol = max;
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}
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void alloc_colors256 (allocfunc_type allocfunc)
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{
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int nb_cols[3]; /* r,g,b */
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int maxcol = newmaxcol == 0 ? 256 : newmaxcol;
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int i,j,k,l;
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xcolnr *map;
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map = (xcolnr *)malloc (sizeof(xcolnr) * maxcol);
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if (!map) {
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write_log ("Not enough mem for colormap!\n");
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abort ();
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}
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/*
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* compute #cols per components
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*/
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for (i = 1; i*i*i <= maxcol; ++i)
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;
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--i;
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nb_cols[RED] = i;
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nb_cols[GRN] = i;
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nb_cols[BLU] = i;
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/*
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* set the colormap
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*/
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l = 0;
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for (i = 0; i < nb_cols[RED]; ++i) {
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int r = (i * 15) / (nb_cols[RED] - 1);
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for (j = 0; j < nb_cols[GRN]; ++j) {
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int g = (j * 15) / (nb_cols[GRN] - 1);
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for (k = 0; k < nb_cols[BLU]; ++k) {
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int b = (k * 15) / (nb_cols[BLU] - 1);
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int result;
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result = allocfunc (r, g, b, map + l);
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l++;
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}
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}
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}
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/* printf("%d color(s) lost\n",maxcol - l);*/
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/*
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* for each component compute the mapping
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*/
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{
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int diffr, diffg, diffb, maxdiff = 0, won = 0, lost;
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int r, d = 8;
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for (r = 0; r < 16; ++r) {
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int cr, g, q;
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k = nb_cols[RED]-1;
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cr = (r * k) / 15;
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q = (r * k) % 15;
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if (q > d && cr < k) ++cr;
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diffr = abs (cr*k - r);
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for (g = 0; g < 16; ++g) {
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int cg, b;
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k = nb_cols[GRN]-1;
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cg = (g * k) / 15;
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q = (g * k) % 15;
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if (q > d && cg < k) ++cg;
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diffg = abs (cg*k - g);
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for (b = 0; b < 16; ++b) {
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int cb, rgb = (r << 8) | (g << 4) | b;
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k = nb_cols[BLU]-1;
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cb = (b * k) / 15;
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q = (b * k) % 15;
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if (q > d && cb < k) ++cb;
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diffb = abs (cb*k - b);
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xcolors[rgb] = map[(cr * nb_cols[GRN] + cg) * nb_cols[BLU] + cb];
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color_diff[rgb] = diffr + diffg + diffb;
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if (color_diff[rgb] > maxdiff)
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maxdiff = color_diff[rgb];
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}
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}
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}
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while (maxdiff > 0 && l < maxcol) {
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int newmaxdiff = 0;
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lost = 0; won++;
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for (r = 15; r >= 0; r--) {
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int g;
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for (g = 15; g >= 0; g--) {
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int b;
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for (b = 15; b >= 0; b--) {
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int rgb = (r << 8) | (g << 4) | b;
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if (color_diff[rgb] == maxdiff) {
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int result;
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if (l >= maxcol)
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lost++;
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else {
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result = allocfunc (r, g, b, xcolors + rgb);
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l++;
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}
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color_diff[rgb] = 0;
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} else if (color_diff[rgb] > newmaxdiff)
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newmaxdiff = color_diff[rgb];
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}
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}
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}
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maxdiff = newmaxdiff;
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}
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/* printf("%d color(s) lost, %d stages won\n",lost, won);*/
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}
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free (map);
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for (i = 0; i < 4096; i++)
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xcolors[i] = xcolors[i] * 0x01010101;
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}
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/*
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* This dithering process works by letting UAE run internaly in 12bit
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* mode and doing the dithering on the fly when rendering to the display.
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* The dithering algorithm is quite fast but uses lot of memory (4*8*2^12 =
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* 128Kb). I don't think that is a trouble right now, but when UAE will
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* emulate AGA and work internaly in 24bit mode, that dithering algorithm
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* will need 4*8*2^24 = 512Mb. Obviously that fast algorithm will not be
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* tractable. However, we could then use an other algorithm, slower, but
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* far more reasonable (I am thinking about the one that is used in DJPEG).
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*/
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uae_u8 cidx[4][8*4096]; /* fast, but memory hungry =:-( */
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/*
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* Compute dithering structures
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*/
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void setup_greydither_maxcol (int maxcol, allocfunc_type allocfunc)
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{
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int i,j,k;
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xcolnr *map;
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for (i = 0; i < 4096; i++)
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xcolors[i] = i << 16 | i;
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map = (xcolnr *)malloc (sizeof(xcolnr) * maxcol);
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if (!map) {
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write_log ("Not enough mem for colormap!\n");
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abort();
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}
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/*
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* set the colormap
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*/
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for (i = 0; i < maxcol; ++i) {
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int c, result;
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c = (15 * i + (maxcol-1)/2) / (maxcol - 1);
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result = allocfunc(c, c, c, map + i);
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/* @@@ check for errors */
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}
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/*
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* for each componant compute the mapping
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*/
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for (i = 0; i < 4; ++i) {
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for (j = 0; j < 4; ++j) {
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int r, d = dither[i][j]*17;
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for (r = 0; r<16; ++r) {
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int g;
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for (g = 0; g < 16; ++g) {
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int b;
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for (b = 0; b < 16; ++b) {
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int rgb = (r << 8) | (g << 4) | b;
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int c,p,q;
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c = (77 * r +
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151 * g +
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28 * b) / 15; /* c in 0..256 */
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k = maxcol-1;
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p = (c * k) / 256;
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q = (c * k) % 256;
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if (q /*/ k*/> d /*/ k*/ && p < k) ++p;
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/* sam: ^^^^^^^ */
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/* It seems that produces better output */
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cidx[i][rgb + (j+4)*4096] =
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cidx[i][rgb + j*4096] = (uae_u8)map[p];
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}
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}
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}
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}
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}
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free (map);
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}
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void setup_greydither (int bits, allocfunc_type allocfunc)
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{
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setup_greydither_maxcol(1 << bits, allocfunc);
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}
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void setup_dither (int bits, allocfunc_type allocfunc)
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{
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int nb_cols[3]; /* r,g,b */
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int maxcol = 1 << bits;
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int i,j,k,l;
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xcolnr *map;
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int *redvals, *grnvals, *bluvals;
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map = (xcolnr *)malloc (sizeof(xcolnr) * maxcol);
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if (!map) {
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write_log ("Not enough mem for colormap!\n");
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abort();
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}
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for (i = 0; i < 4096; i++)
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xcolors[i] = i << 16 | i;
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/*
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* compute #cols per components
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*/
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for (i = 1; i*i*i <= maxcol; ++i)
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;
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--i;
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nb_cols[RED] = i;
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nb_cols[GRN] = i;
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nb_cols[BLU] = i;
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if (nb_cols[RED]*(++i)*nb_cols[BLU] <= maxcol) {
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nb_cols[GRN] = i;
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if ((i)*nb_cols[GRN]*nb_cols[BLU] <= maxcol)
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nb_cols[RED] = i;
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}
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redvals = (int *)malloc (sizeof(int) * maxcol);
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grnvals = redvals + nb_cols[RED];
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bluvals = grnvals + nb_cols[GRN];
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/*
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* set the colormap
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*/
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l = 0;
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for (i = 0; i < nb_cols[RED]; ++i) {
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int r = (i * 15) / (nb_cols[RED] - 1);
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redvals[i] = r;
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for (j = 0; j < nb_cols[GRN]; ++j) {
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int g = (j * 15) / (nb_cols[GRN] - 1);
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grnvals[j] = g;
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for (k = 0; k < nb_cols[BLU]; ++k) {
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int b = (k * 15) / (nb_cols[BLU] - 1);
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int result;
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bluvals[k] = b;
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result = allocfunc(r, g, b, map + l);
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l++;
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}
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}
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}
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/* write_log ("%d color(s) lost\n",maxcol - l);*/
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/*
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* for each component compute the mapping
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*/
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{
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int r;
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for (r = 0; r < 16; ++r) {
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int g;
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for (g = 0; g < 16; ++g) {
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int b;
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for (b = 0; b < 16; ++b) {
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int rgb = (r << 8) | (g << 4) | b;
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for (i = 0; i < 4; ++i) for (j = 0; j < 4; ++j) {
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int d = dither[i][j];
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int cr, cg, cb, k, q;
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#if 0 /* Slightly different algorithm. Needs some tuning. */
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int rederr = 0, grnerr = 0, bluerr = 0;
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k = nb_cols[RED]-1;
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cr = r * k / 15;
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q = r * k - 15*cr;
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if (cr < 0)
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cr = 0;
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else if (q / k > d / k && rederr <= 0)
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++cr;
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if (cr > k) cr = k;
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rederr += redvals[cr]-r;
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k = nb_cols[GRN]-1;
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cg = g * k / 15;
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q = g * k - 15*cg;
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if (cg < 0)
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cg = 0;
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else if (q / k > d / k && grnerr <= 0)
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++cg;
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if (cg > k) cg = k;
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grnerr += grnvals[cg]-g;
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k = nb_cols[BLU]-1;
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cb = b * k / 15;
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q = b * k - 15*cb;
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if (cb < 0)
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cb = 0;
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else if (q / k > d / k && bluerr <= 0)
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++cb;
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if (cb > k) cb = k;
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bluerr += bluvals[cb]-b;
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#else
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k = nb_cols[RED]-1;
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cr = r * k / 15;
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q = r * k - 15*cr;
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if (cr < 0)
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cr = 0;
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else if (q /*/ k*/ > d /*/ k*/)
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++cr;
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if (cr > k) cr = k;
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k = nb_cols[GRN]-1;
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cg = g * k / 15;
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q = g * k - 15*cg;
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if (cg < 0)
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cg = 0;
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else if (q /*/ k*/ > d /*/ k*/)
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++cg;
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if (cg > k) cg = k;
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k = nb_cols[BLU]-1;
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cb = b * k / 15;
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q = b * k - 15*cb;
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if (cb < 0)
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cb = 0;
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else if (q /*/ k*/ > d /*/ k*/)
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++cb;
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if (cb > k) cb = k;
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#endif
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cidx[i][rgb + (j+4)*4096] = cidx[i][rgb + j*4096] = (uae_u8)map[(cr*nb_cols[GRN]+cg)*nb_cols[BLU]+cb];
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}
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}
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}
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}
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}
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free (redvals);
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free (map);
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}
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#if !defined X86_ASSEMBLY
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/*
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* Dither the line.
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* Make sure you call this only with (len & 3) == 0, or you'll just make
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* yourself unhappy.
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*/
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void DitherLine (uae_u8 *l, uae_u16 *r4g4b4, int x, int y, uae_s16 len, int bits)
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{
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uae_u8 *dith = cidx[y&3]+(x&3)*4096;
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uae_u8 d = 0;
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int bitsleft = 8;
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if (bits == 8) {
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while (len > 0) {
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*l++ = dith[0*4096 + *r4g4b4++];
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*l++ = dith[1*4096 + *r4g4b4++];
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*l++ = dith[2*4096 + *r4g4b4++];
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*l++ = dith[3*4096 + *r4g4b4++];
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len -= 4;
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}
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return;
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}
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while (len) {
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int v;
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v = dith[0*4096 + *r4g4b4++];
|
|
bitsleft -= bits;
|
|
d |= (v << bitsleft);
|
|
if (!bitsleft)
|
|
*l++ = d, bitsleft = 8, d = 0;
|
|
|
|
v = dith[1*4096 + *r4g4b4++];
|
|
bitsleft -= bits;
|
|
d |= (v << bitsleft);
|
|
if (!bitsleft)
|
|
*l++ = d, bitsleft = 8, d = 0;
|
|
|
|
v = dith[2*4096 + *r4g4b4++];
|
|
bitsleft -= bits;
|
|
d |= (v << bitsleft);
|
|
if (!bitsleft)
|
|
*l++ = d, bitsleft = 8, d = 0;
|
|
|
|
v = dith[3*4096 + *r4g4b4++];
|
|
bitsleft -= bits;
|
|
d |= (v << bitsleft);
|
|
if (!bitsleft)
|
|
*l++ = d, bitsleft = 8, d = 0;
|
|
len -= 4;
|
|
}
|
|
}
|
|
#endif
|