a505894a10
- 86Box's own headers go to /86box - munt's public interface goes to /mt32emu - all slirp headers go to /slirp (might want to consider using only its public inteface) - single file headers from other projects go in include root
346 lines
9.9 KiB
C
346 lines
9.9 KiB
C
/*
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* 86Box A hypervisor and IBM PC system emulator that specializes in
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* running old operating systems and software designed for IBM
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* PC systems and compatibles from 1981 through fairly recent
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* system designs based on the PCI bus.
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*
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* This file is part of the 86Box distribution.
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*
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* IBM CGA composite filter, borrowed from reenigne's DOSBox
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* patch and ported to C.
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*
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*
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*
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* Authors: reenigne,
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* Miran Grca, <mgrca8@gmail.com>
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*
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* Copyright 2015-2019 reenigne.
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* Copyright 2015-2019 Miran Grca.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include <math.h>
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#include <86box/86box.h>
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#include <86box/timer.h>
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#include <86box/mem.h>
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#include <86box/vid_cga.h>
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#include <86box/vid_cga_comp.h>
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int CGA_Composite_Table[1024];
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static double brightness = 0;
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static double contrast = 100;
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static double saturation = 100;
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static double sharpness = 0;
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static double hue_offset = 0;
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/* New algorithm by reenigne
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Works in all CGA modes/color settings and can simulate older and newer CGA revisions */
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static const double tau = 6.28318531; /* == 2*pi */
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static unsigned char chroma_multiplexer[256] = {
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2, 2, 2, 2, 114,174, 4, 3, 2, 1,133,135, 2,113,150, 4,
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133, 2, 1, 99, 151,152, 2, 1, 3, 2, 96,136, 151,152,151,152,
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2, 56, 62, 4, 111,250,118, 4, 0, 51,207,137, 1,171,209, 5,
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140, 50, 54,100, 133,202, 57, 4, 2, 50,153,149, 128,198,198,135,
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32, 1, 36, 81, 147,158, 1, 42, 33, 1,210,254, 34,109,169, 77,
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177, 2, 0,165, 189,154, 3, 44, 33, 0, 91,197, 178,142,144,192,
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4, 2, 61, 67, 117,151,112, 83, 4, 0,249,255, 3,107,249,117,
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147, 1, 50,162, 143,141, 52, 54, 3, 0,145,206, 124,123,192,193,
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72, 78, 2, 0, 159,208, 4, 0, 53, 58,164,159, 37,159,171, 1,
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248,117, 4, 98, 212,218, 5, 2, 54, 59, 93,121, 176,181,134,130,
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1, 61, 31, 0, 160,255, 34, 1, 1, 58,197,166, 0,177,194, 2,
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162,111, 34, 96, 205,253, 32, 1, 1, 57,123,125, 119,188,150,112,
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78, 4, 0, 75, 166,180, 20, 38, 78, 1,143,246, 42,113,156, 37,
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252, 4, 1,188, 175,129, 1, 37, 118, 4, 88,249, 202,150,145,200,
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61, 59, 60, 60, 228,252,117, 77, 60, 58,248,251, 81,212,254,107,
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198, 59, 58,169, 250,251, 81, 80, 100, 58,154,250, 251,252,252,252};
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static double intensity[4] = {
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77.175381, 88.654656, 166.564623, 174.228438};
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#define NEW_CGA(c,i,r,g,b) (((c)/0.72)*0.29 + ((i)/0.28)*0.32 + ((r)/0.28)*0.1 + ((g)/0.28)*0.22 + ((b)/0.28)*0.07)
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double mode_brightness;
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double mode_contrast;
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double mode_hue;
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double min_v;
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double max_v;
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double video_ri, video_rq, video_gi, video_gq, video_bi, video_bq;
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int video_sharpness;
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int tandy_mode_control = 0;
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static bool new_cga = 0;
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void update_cga16_color(uint8_t cgamode) {
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int x;
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double c, i, v;
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double q, a, s, r;
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double iq_adjust_i, iq_adjust_q;
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double i0, i3, mode_saturation;
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static const double ri = 0.9563;
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static const double rq = 0.6210;
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static const double gi = -0.2721;
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static const double gq = -0.6474;
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static const double bi = -1.1069;
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static const double bq = 1.7046;
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if (!new_cga) {
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min_v = chroma_multiplexer[0] + intensity[0];
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max_v = chroma_multiplexer[255] + intensity[3];
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}
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else {
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i0 = intensity[0];
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i3 = intensity[3];
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min_v = NEW_CGA(chroma_multiplexer[0], i0, i0, i0, i0);
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max_v = NEW_CGA(chroma_multiplexer[255], i3, i3, i3, i3);
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}
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mode_contrast = 256/(max_v - min_v);
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mode_brightness = -min_v*mode_contrast;
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if ((cgamode & 3) == 1)
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mode_hue = 14;
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else
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mode_hue = 4;
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mode_contrast *= contrast * (new_cga ? 1.2 : 1)/100; /* new CGA: 120% */
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mode_brightness += (new_cga ? brightness-10 : brightness)*5; /* new CGA: -10 */
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mode_saturation = (new_cga ? 4.35 : 2.9)*saturation/100; /* new CGA: 150% */
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for (x = 0; x < 1024; ++x) {
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int phase = x & 3;
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int right = (x >> 2) & 15;
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int left = (x >> 6) & 15;
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int rc = right;
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int lc = left;
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if ((cgamode & 4) != 0) {
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rc = (right & 8) | ((right & 7) != 0 ? 7 : 0);
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lc = (left & 8) | ((left & 7) != 0 ? 7 : 0);
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}
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c = chroma_multiplexer[((lc & 7) << 5) | ((rc & 7) << 2) | phase];
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i = intensity[(left >> 3) | ((right >> 2) & 2)];
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if (!new_cga)
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v = c + i;
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else {
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double r = intensity[((left >> 2) & 1) | ((right >> 1) & 2)];
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double g = intensity[((left >> 1) & 1) | (right & 2)];
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double b = intensity[(left & 1) | ((right << 1) & 2)];
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v = NEW_CGA(c, i, r, g, b);
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}
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CGA_Composite_Table[x] = (int) (v*mode_contrast + mode_brightness);
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}
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i = CGA_Composite_Table[6*68] - CGA_Composite_Table[6*68 + 2];
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q = CGA_Composite_Table[6*68 + 1] - CGA_Composite_Table[6*68 + 3];
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a = tau*(33 + 90 + hue_offset + mode_hue)/360.0;
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c = cos(a);
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s = sin(a);
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r = 256*mode_saturation/sqrt(i*i+q*q);
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iq_adjust_i = -(i*c + q*s)*r;
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iq_adjust_q = (q*c - i*s)*r;
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video_ri = (int) (ri*iq_adjust_i + rq*iq_adjust_q);
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video_rq = (int) (-ri*iq_adjust_q + rq*iq_adjust_i);
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video_gi = (int) (gi*iq_adjust_i + gq*iq_adjust_q);
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video_gq = (int) (-gi*iq_adjust_q + gq*iq_adjust_i);
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video_bi = (int) (bi*iq_adjust_i + bq*iq_adjust_q);
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video_bq = (int) (-bi*iq_adjust_q + bq*iq_adjust_i);
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video_sharpness = (int) (sharpness*256/100);
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}
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static Bit8u byte_clamp(int v) {
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v >>= 13;
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return v < 0 ? 0 : (v > 255 ? 255 : v);
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}
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/* 2048x1536 is the maximum we can possibly support. */
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#define SCALER_MAXWIDTH 2048
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static int temp[SCALER_MAXWIDTH + 10]={0};
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static int atemp[SCALER_MAXWIDTH + 2]={0};
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static int btemp[SCALER_MAXWIDTH + 2]={0};
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Bit32u * Composite_Process(uint8_t cgamode, Bit8u border, Bit32u blocks/*, bool doublewidth*/, Bit32u *TempLine)
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{
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int x;
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Bit32u x2;
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int w = blocks*4;
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int *o;
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Bit32u *rgbi;
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int *b;
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int *i;
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Bit32u* srgb;
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int *ap, *bp;
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#define COMPOSITE_CONVERT(I, Q) do { \
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i[1] = (i[1]<<3) - ap[1]; \
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a = ap[0]; \
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b = bp[0]; \
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c = i[0]+i[0]; \
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d = i[-1]+i[1]; \
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y = ((c+d)<<8) + video_sharpness*(c-d); \
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rr = y + video_ri*(I) + video_rq*(Q); \
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gg = y + video_gi*(I) + video_gq*(Q); \
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bb = y + video_bi*(I) + video_bq*(Q); \
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++i; \
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++ap; \
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++bp; \
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*srgb = (byte_clamp(rr)<<16) | (byte_clamp(gg)<<8) | byte_clamp(bb); \
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++srgb; \
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} while (0)
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#define OUT(v) do { *o = (v); ++o; } while (0)
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/* Simulate CGA composite output */
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o = temp;
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rgbi = TempLine;
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b = &CGA_Composite_Table[border*68];
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for (x = 0; x < 4; ++x)
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OUT(b[(x+3)&3]);
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OUT(CGA_Composite_Table[(border<<6) | ((*rgbi & 0x0f)<<2) | 3]);
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for (x = 0; x < w-1; ++x) {
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OUT(CGA_Composite_Table[((rgbi[0] & 0x0f)<<6) | ((rgbi[1] & 0x0f)<<2) | (x&3)]);
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++rgbi;
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}
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OUT(CGA_Composite_Table[((*rgbi & 0x0f)<<6) | (border<<2) | 3]);
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for (x = 0; x < 5; ++x)
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OUT(b[x&3]);
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if ((cgamode & 4) != 0) {
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/* Decode */
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i = temp + 5;
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srgb = (Bit32u *)TempLine;
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for (x2 = 0; x2 < blocks*4; ++x2) {
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int c = (i[0]+i[0])<<3;
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int d = (i[-1]+i[1])<<3;
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int y = ((c+d)<<8) + video_sharpness*(c-d);
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++i;
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*srgb = byte_clamp(y)*0x10101;
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++srgb;
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}
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}
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else {
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/* Store chroma */
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i = temp + 4;
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ap = atemp + 1;
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bp = btemp + 1;
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for (x = -1; x < w + 1; ++x) {
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ap[x] = i[-4]-((i[-2]-i[0]+i[2])<<1)+i[4];
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bp[x] = (i[-3]-i[-1]+i[1]-i[3])<<1;
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++i;
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}
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/* Decode */
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i = temp + 5;
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i[-1] = (i[-1]<<3) - ap[-1];
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i[0] = (i[0]<<3) - ap[0];
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srgb = (Bit32u *)TempLine;
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for (x2 = 0; x2 < blocks; ++x2) {
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int y,a,b,c,d,rr,gg,bb;
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COMPOSITE_CONVERT(a, b);
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COMPOSITE_CONVERT(-b, a);
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COMPOSITE_CONVERT(-a, -b);
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COMPOSITE_CONVERT(b, -a);
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}
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}
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#undef COMPOSITE_CONVERT
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#undef OUT
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return TempLine;
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}
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void IncreaseHue(uint8_t cgamode)
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{
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hue_offset += 5.0;
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update_cga16_color(cgamode);
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}
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void DecreaseHue(uint8_t cgamode)
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{
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hue_offset -= 5.0;
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update_cga16_color(cgamode);
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}
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void IncreaseSaturation(uint8_t cgamode)
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{
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saturation += 5;
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update_cga16_color(cgamode);
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}
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void DecreaseSaturation(uint8_t cgamode)
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{
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saturation -= 5;
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update_cga16_color(cgamode);
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}
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void IncreaseContrast(uint8_t cgamode)
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{
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contrast += 5;
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update_cga16_color(cgamode);
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}
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void DecreaseContrast(uint8_t cgamode)
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{
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contrast -= 5;
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update_cga16_color(cgamode);
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}
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void IncreaseBrightness(uint8_t cgamode)
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{
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brightness += 5;
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update_cga16_color(cgamode);
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}
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void DecreaseBrightness(uint8_t cgamode)
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{
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brightness -= 5;
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update_cga16_color(cgamode);
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}
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void IncreaseSharpness(uint8_t cgamode)
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{
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sharpness += 10;
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update_cga16_color(cgamode);
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}
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void DecreaseSharpness(uint8_t cgamode)
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{
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sharpness -= 10;
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update_cga16_color(cgamode);
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}
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void cga_comp_init(int revision)
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{
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new_cga = revision;
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/* Making sure this gets reset after reset. */
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brightness = 0;
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contrast = 100;
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saturation = 100;
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sharpness = 0;
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hue_offset = 0;
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update_cga16_color(0);
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}
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