f6612fb33b
A lot of clean ups from waltje; Start of a directory structure for the code, thanks to waltje.
594 lines
26 KiB
C
594 lines
26 KiB
C
#include <stdlib.h>
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#include <math.h>
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#include "../ibm.h"
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#include "../io.h"
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#include "../mem.h"
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#include "../pic.h"
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#include "../timer.h"
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#include "../device.h"
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#include "video.h"
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#include "vid_cga_comp.h"
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#include "vid_pcjr.h"
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#define PCJR_RGB 0
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#define PCJR_COMPOSITE 1
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typedef struct pcjr_t
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{
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mem_mapping_t mapping;
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uint8_t crtc[32];
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int crtcreg;
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int array_index;
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uint8_t array[32];
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int array_ff;
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int memctrl;
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uint8_t stat;
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int addr_mode;
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uint8_t *vram, *b8000;
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int linepos, displine;
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int sc, vc;
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int dispon;
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int con, coff, cursoron, blink;
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int vsynctime, vadj;
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uint16_t ma, maback;
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int dispontime, dispofftime, vidtime;
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int firstline, lastline;
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int composite;
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} pcjr_t;
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static uint8_t crtcmask[32] =
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{
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0xff, 0xff, 0xff, 0xff, 0x7f, 0x1f, 0x7f, 0x7f, 0xf3, 0x1f, 0x7f, 0x1f, 0x3f, 0xff, 0x3f, 0xff,
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0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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void pcjr_recalcaddress(pcjr_t *pcjr);
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void pcjr_recalctimings(pcjr_t *pcjr);
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void pcjr_out(uint16_t addr, uint8_t val, void *p)
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{
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pcjr_t *pcjr = (pcjr_t *)p;
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uint8_t old;
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switch (addr)
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{
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case 0x3d4:
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pcjr->crtcreg = val & 0x1f;
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return;
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case 0x3d5:
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old = pcjr->crtc[pcjr->crtcreg];
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pcjr->crtc[pcjr->crtcreg] = val & crtcmask[pcjr->crtcreg];
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if (old != val)
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{
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if (pcjr->crtcreg < 0xe || pcjr->crtcreg > 0x10)
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{
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fullchange = changeframecount;
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pcjr_recalctimings(pcjr);
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}
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}
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return;
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case 0x3da:
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if (!pcjr->array_ff)
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pcjr->array_index = val & 0x1f;
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else
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{
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if (pcjr->array_index & 0x10)
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val &= 0x0f;
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pcjr->array[pcjr->array_index & 0x1f] = val;
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if (!(pcjr->array_index & 0x1f))
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update_cga16_color(val);
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}
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pcjr->array_ff = !pcjr->array_ff;
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break;
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case 0x3df:
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pcjr->memctrl = val;
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pcjr->addr_mode = val >> 6;
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pcjr_recalcaddress(pcjr);
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break;
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}
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}
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uint8_t pcjr_in(uint16_t addr, void *p)
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{
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pcjr_t *pcjr = (pcjr_t *)p;
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switch (addr)
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{
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case 0x3d4:
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return pcjr->crtcreg;
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case 0x3d5:
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return pcjr->crtc[pcjr->crtcreg];
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case 0x3da:
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pcjr->array_ff = 0;
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pcjr->stat ^= 0x10;
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return pcjr->stat;
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}
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return 0xFF;
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}
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void pcjr_recalcaddress(pcjr_t *pcjr)
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{
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if ((pcjr->memctrl & 0xc0) == 0xc0)
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{
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pcjr->vram = &ram[(pcjr->memctrl & 0x06) << 14];
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pcjr->b8000 = &ram[(pcjr->memctrl & 0x30) << 11];
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}
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else
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{
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pcjr->vram = &ram[(pcjr->memctrl & 0x07) << 14];
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pcjr->b8000 = &ram[(pcjr->memctrl & 0x38) << 11];
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}
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}
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void pcjr_write(uint32_t addr, uint8_t val, void *p)
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{
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pcjr_t *pcjr = (pcjr_t *)p;
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if (pcjr->memctrl == -1)
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return;
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egawrites++;
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pcjr->b8000[addr & 0x3fff] = val;
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}
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uint8_t pcjr_read(uint32_t addr, void *p)
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{
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pcjr_t *pcjr = (pcjr_t *)p;
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if (pcjr->memctrl == -1)
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return 0xff;
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egareads++;
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return pcjr->b8000[addr & 0x3fff];
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}
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void pcjr_recalctimings(pcjr_t *pcjr)
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{
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double _dispontime, _dispofftime, disptime;
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if (pcjr->array[0] & 1)
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{
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disptime = pcjr->crtc[0] + 1;
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_dispontime = pcjr->crtc[1];
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}
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else
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{
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disptime = (pcjr->crtc[0] + 1) << 1;
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_dispontime = pcjr->crtc[1] << 1;
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}
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_dispofftime = disptime - _dispontime;
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_dispontime *= CGACONST;
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_dispofftime *= CGACONST;
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pcjr->dispontime = (int)(_dispontime * (1 << TIMER_SHIFT));
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pcjr->dispofftime = (int)(_dispofftime * (1 << TIMER_SHIFT));
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}
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void pcjr_poll(void *p)
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{
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pcjr_t *pcjr = (pcjr_t *)p;
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uint16_t ca = (pcjr->crtc[15] | (pcjr->crtc[14] << 8)) & 0x3fff;
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int drawcursor;
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int x, c;
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int oldvc;
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uint8_t chr, attr;
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uint16_t dat;
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int cols[4];
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int oldsc;
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if (!pcjr->linepos)
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{
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pcjr->vidtime += pcjr->dispofftime;
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pcjr->stat &= ~1;
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pcjr->linepos = 1;
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oldsc = pcjr->sc;
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if ((pcjr->crtc[8] & 3) == 3)
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pcjr->sc = (pcjr->sc << 1) & 7;
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if (pcjr->dispon)
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{
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uint16_t offset = 0;
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uint16_t mask = 0x1fff;
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if (pcjr->displine < pcjr->firstline)
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{
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pcjr->firstline = pcjr->displine;
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video_wait_for_buffer();
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}
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pcjr->lastline = pcjr->displine;
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cols[0] = (pcjr->array[2] & 0xf) + 16;
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for (c = 0; c < 8; c++)
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{
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buffer->line[pcjr->displine][c] = cols[0];
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if (pcjr->array[0] & 1) buffer->line[pcjr->displine][c + (pcjr->crtc[1] << 3) + 8] = cols[0];
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else buffer->line[pcjr->displine][c + (pcjr->crtc[1] << 4) + 8] = cols[0];
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}
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switch (pcjr->addr_mode)
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{
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case 0: /*Alpha*/
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offset = 0;
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mask = 0x3fff;
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break;
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case 1: /*Low resolution graphics*/
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offset = (pcjr->sc & 1) * 0x2000;
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break;
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case 3: /*High resolution graphics*/
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offset = (pcjr->sc & 3) * 0x2000;
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break;
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}
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switch ((pcjr->array[0] & 0x13) | ((pcjr->array[3] & 0x08) << 5))
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{
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case 0x13: /*320x200x16*/
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for (x = 0; x < pcjr->crtc[1]; x++)
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{
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dat = (pcjr->vram[((pcjr->ma << 1) & mask) + offset] << 8) |
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pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1];
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pcjr->ma++;
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buffer->line[pcjr->displine][(x << 3) + 8] =
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buffer->line[pcjr->displine][(x << 3) + 9] = pcjr->array[((dat >> 12) & pcjr->array[1]) + 16] + 16;
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buffer->line[pcjr->displine][(x << 3) + 10] =
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buffer->line[pcjr->displine][(x << 3) + 11] = pcjr->array[((dat >> 8) & pcjr->array[1]) + 16] + 16;
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buffer->line[pcjr->displine][(x << 3) + 12] =
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buffer->line[pcjr->displine][(x << 3) + 13] = pcjr->array[((dat >> 4) & pcjr->array[1]) + 16] + 16;
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buffer->line[pcjr->displine][(x << 3) + 14] =
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buffer->line[pcjr->displine][(x << 3) + 15] = pcjr->array[(dat & pcjr->array[1]) + 16] + 16;
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}
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break;
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case 0x12: /*160x200x16*/
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for (x = 0; x < pcjr->crtc[1]; x++)
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{
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dat = (pcjr->vram[((pcjr->ma << 1) & mask) + offset] << 8) |
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pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1];
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pcjr->ma++;
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buffer->line[pcjr->displine][(x << 4) + 8] =
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buffer->line[pcjr->displine][(x << 4) + 9] =
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buffer->line[pcjr->displine][(x << 4) + 10] =
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buffer->line[pcjr->displine][(x << 4) + 11] = pcjr->array[((dat >> 12) & pcjr->array[1]) + 16] + 16;
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buffer->line[pcjr->displine][(x << 4) + 12] =
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buffer->line[pcjr->displine][(x << 4) + 13] =
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buffer->line[pcjr->displine][(x << 4) + 14] =
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buffer->line[pcjr->displine][(x << 4) + 15] = pcjr->array[((dat >> 8) & pcjr->array[1]) + 16] + 16;
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buffer->line[pcjr->displine][(x << 4) + 16] =
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buffer->line[pcjr->displine][(x << 4) + 17] =
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buffer->line[pcjr->displine][(x << 4) + 18] =
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buffer->line[pcjr->displine][(x << 4) + 19] = pcjr->array[((dat >> 4) & pcjr->array[1]) + 16] + 16;
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buffer->line[pcjr->displine][(x << 4) + 20] =
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buffer->line[pcjr->displine][(x << 4) + 21] =
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buffer->line[pcjr->displine][(x << 4) + 22] =
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buffer->line[pcjr->displine][(x << 4) + 23] = pcjr->array[(dat & pcjr->array[1]) + 16] + 16;
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}
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break;
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case 0x03: /*640x200x4*/
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for (x = 0; x < pcjr->crtc[1]; x++)
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{
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dat = (pcjr->vram[((pcjr->ma << 1) & mask) + offset] << 8) |
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pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1];
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pcjr->ma++;
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for (c = 0; c < 8; c++)
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{
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chr = (dat >> 7) & 1;
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chr |= ((dat >> 14) & 2);
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buffer->line[pcjr->displine][(x << 3) + 8 + c] = pcjr->array[(chr & pcjr->array[1]) + 16] + 16;
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dat <<= 1;
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}
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}
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break;
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case 0x01: /*80 column text*/
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for (x = 0; x < pcjr->crtc[1]; x++)
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{
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chr = pcjr->vram[((pcjr->ma << 1) & mask) + offset];
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attr = pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1];
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drawcursor = ((pcjr->ma == ca) && pcjr->con && pcjr->cursoron);
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if (pcjr->array[3] & 4)
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{
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cols[1] = pcjr->array[ ((attr & 15) & pcjr->array[1]) + 16] + 16;
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cols[0] = pcjr->array[(((attr >> 4) & 7) & pcjr->array[1]) + 16] + 16;
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if ((pcjr->blink & 16) && (attr & 0x80) && !drawcursor)
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cols[1] = cols[0];
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}
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else
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{
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cols[1] = pcjr->array[((attr & 15) & pcjr->array[1]) + 16] + 16;
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cols[0] = pcjr->array[((attr >> 4) & pcjr->array[1]) + 16] + 16;
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}
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if (pcjr->sc & 8)
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{
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for (c = 0; c < 8; c++)
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buffer->line[pcjr->displine][(x << 3) + c + 8] = cols[0];
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}
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else
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{
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for (c = 0; c < 8; c++)
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buffer->line[pcjr->displine][(x << 3) + c + 8] = cols[(fontdat[chr][pcjr->sc & 7] & (1 << (c ^ 7))) ? 1 : 0];
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}
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if (drawcursor)
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{
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for (c = 0; c < 8; c++)
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buffer->line[pcjr->displine][(x << 3) + c + 8] ^= 15;
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}
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pcjr->ma++;
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}
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break;
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case 0x00: /*40 column text*/
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for (x = 0; x < pcjr->crtc[1]; x++)
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{
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chr = pcjr->vram[((pcjr->ma << 1) & mask) + offset];
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attr = pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1];
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drawcursor = ((pcjr->ma == ca) && pcjr->con && pcjr->cursoron);
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if (pcjr->array[3] & 4)
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{
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cols[1] = pcjr->array[ ((attr & 15) & pcjr->array[1]) + 16] + 16;
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cols[0] = pcjr->array[(((attr >> 4) & 7) & pcjr->array[1]) + 16] + 16;
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if ((pcjr->blink & 16) && (attr & 0x80) && !drawcursor)
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cols[1] = cols[0];
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}
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else
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{
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cols[1] = pcjr->array[((attr & 15) & pcjr->array[1]) + 16] + 16;
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cols[0] = pcjr->array[((attr >> 4) & pcjr->array[1]) + 16] + 16;
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}
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pcjr->ma++;
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if (pcjr->sc & 8)
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{
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for (c = 0; c < 8; c++)
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buffer->line[pcjr->displine][(x << 4) + (c << 1) + 8] =
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buffer->line[pcjr->displine][(x << 4) + (c << 1) + 1 + 8] = cols[0];
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}
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else
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{
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for (c = 0; c < 8; c++)
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buffer->line[pcjr->displine][(x << 4) + (c << 1) + 8] =
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buffer->line[pcjr->displine][(x << 4) + (c << 1) + 1 + 8] = cols[(fontdat[chr][pcjr->sc & 7] & (1 << (c ^ 7))) ? 1 : 0];
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}
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if (drawcursor)
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{
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for (c = 0; c < 16; c++)
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buffer->line[pcjr->displine][(x << 4) + c + 8] ^= 15;
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}
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}
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break;
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case 0x02: /*320x200x4*/
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cols[0] = pcjr->array[0 + 16] + 16;
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cols[1] = pcjr->array[1 + 16] + 16;
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cols[2] = pcjr->array[2 + 16] + 16;
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cols[3] = pcjr->array[3 + 16] + 16;
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for (x = 0; x < pcjr->crtc[1]; x++)
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{
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dat = (pcjr->vram[((pcjr->ma << 1) & mask) + offset] << 8) |
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pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1];
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pcjr->ma++;
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for (c = 0; c < 8; c++)
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{
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buffer->line[pcjr->displine][(x << 4) + (c << 1) + 8] =
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buffer->line[pcjr->displine][(x << 4) + (c << 1) + 1 + 8] = cols[dat >> 14];
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dat <<= 2;
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}
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}
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break;
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case 0x102: /*640x200x2*/
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cols[0] = pcjr->array[0 + 16] + 16;
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cols[1] = pcjr->array[1 + 16] + 16;
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for (x = 0; x < pcjr->crtc[1]; x++)
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{
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dat = (pcjr->vram[((pcjr->ma << 1) & mask) + offset] << 8) |
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pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1];
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pcjr->ma++;
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for (c = 0; c < 16; c++)
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{
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buffer->line[pcjr->displine][(x << 4) + c + 8] = cols[dat >> 15];
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dat <<= 1;
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}
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}
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break;
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}
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}
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else
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{
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if (pcjr->array[3] & 4)
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{
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if (pcjr->array[0] & 1) hline(buffer, 0, pcjr->displine, (pcjr->crtc[1] << 3) + 16, (pcjr->array[2] & 0xf) + 16);
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else hline(buffer, 0, pcjr->displine, (pcjr->crtc[1] << 4) + 16, (pcjr->array[2] & 0xf) + 16);
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}
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else
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{
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cols[0] = pcjr->array[0 + 16] + 16;
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if (pcjr->array[0] & 1) hline(buffer, 0, pcjr->displine, (pcjr->crtc[1] << 3) + 16, cols[0]);
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else hline(buffer, 0, pcjr->displine, (pcjr->crtc[1] << 4) + 16, cols[0]);
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}
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}
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if (pcjr->array[0] & 1) x = (pcjr->crtc[1] << 3) + 16;
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else x = (pcjr->crtc[1] << 4) + 16;
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if (pcjr->composite)
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{
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for (c = 0; c < x; c++)
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buffer32->line[pcjr->displine][c] = buffer->line[pcjr->displine][c] & 0xf;
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Composite_Process(pcjr->array[0], 0, x >> 2, buffer32->line[pcjr->displine]);
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}
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pcjr->sc = oldsc;
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if (pcjr->vc == pcjr->crtc[7] && !pcjr->sc)
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{
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pcjr->stat |= 8;
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}
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pcjr->displine++;
|
|
if (pcjr->displine >= 360)
|
|
pcjr->displine = 0;
|
|
}
|
|
else
|
|
{
|
|
pcjr->vidtime += pcjr->dispontime;
|
|
if (pcjr->dispon)
|
|
pcjr->stat |= 1;
|
|
pcjr->linepos = 0;
|
|
if (pcjr->vsynctime)
|
|
{
|
|
pcjr->vsynctime--;
|
|
if (!pcjr->vsynctime)
|
|
{
|
|
pcjr->stat &= ~8;
|
|
}
|
|
}
|
|
if (pcjr->sc == (pcjr->crtc[11] & 31) || ((pcjr->crtc[8] & 3) == 3 && pcjr->sc == ((pcjr->crtc[11] & 31) >> 1)))
|
|
{
|
|
pcjr->con = 0;
|
|
pcjr->coff = 1;
|
|
}
|
|
if (pcjr->vadj)
|
|
{
|
|
pcjr->sc++;
|
|
pcjr->sc &= 31;
|
|
pcjr->ma = pcjr->maback;
|
|
pcjr->vadj--;
|
|
if (!pcjr->vadj)
|
|
{
|
|
pcjr->dispon = 1;
|
|
pcjr->ma = pcjr->maback = (pcjr->crtc[13] | (pcjr->crtc[12] << 8)) & 0x3fff;
|
|
pcjr->sc = 0;
|
|
}
|
|
}
|
|
else if (pcjr->sc == pcjr->crtc[9] || ((pcjr->crtc[8] & 3) == 3 && pcjr->sc == (pcjr->crtc[9] >> 1)))
|
|
{
|
|
pcjr->maback = pcjr->ma;
|
|
pcjr->sc = 0;
|
|
oldvc = pcjr->vc;
|
|
pcjr->vc++;
|
|
pcjr->vc &= 127;
|
|
if (pcjr->vc == pcjr->crtc[6])
|
|
pcjr->dispon = 0;
|
|
if (oldvc == pcjr->crtc[4])
|
|
{
|
|
pcjr->vc = 0;
|
|
pcjr->vadj = pcjr->crtc[5];
|
|
if (!pcjr->vadj)
|
|
pcjr->dispon = 1;
|
|
if (!pcjr->vadj)
|
|
pcjr->ma = pcjr->maback = (pcjr->crtc[13] | (pcjr->crtc[12] << 8)) & 0x3fff;
|
|
if ((pcjr->crtc[10] & 0x60) == 0x20) pcjr->cursoron = 0;
|
|
else pcjr->cursoron = pcjr->blink & 16;
|
|
}
|
|
if (pcjr->vc == pcjr->crtc[7])
|
|
{
|
|
pcjr->dispon = 0;
|
|
pcjr->displine = 0;
|
|
pcjr->vsynctime = 16;
|
|
picint(1 << 5);
|
|
if (pcjr->crtc[7])
|
|
{
|
|
if (pcjr->array[0] & 1) x = (pcjr->crtc[1] << 3) + 16;
|
|
else x = (pcjr->crtc[1] << 4) + 16;
|
|
pcjr->lastline++;
|
|
if (x != xsize || (pcjr->lastline - pcjr->firstline) != ysize)
|
|
{
|
|
xsize = x;
|
|
ysize = pcjr->lastline - pcjr->firstline;
|
|
if (xsize < 64) xsize = 656;
|
|
if (ysize < 32) ysize = 200;
|
|
updatewindowsize(xsize, (ysize << 1) + 16);
|
|
}
|
|
|
|
if (pcjr->composite)
|
|
video_blit_memtoscreen(0, pcjr->firstline-4, 0, (pcjr->lastline - pcjr->firstline) + 8, xsize, (pcjr->lastline - pcjr->firstline) + 8);
|
|
else
|
|
video_blit_memtoscreen_8(0, pcjr->firstline-4, xsize, (pcjr->lastline - pcjr->firstline) + 8);
|
|
|
|
frames++;
|
|
video_res_x = xsize - 16;
|
|
video_res_y = ysize;
|
|
}
|
|
pcjr->firstline = 1000;
|
|
pcjr->lastline = 0;
|
|
pcjr->blink++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
pcjr->sc++;
|
|
pcjr->sc &= 31;
|
|
pcjr->ma = pcjr->maback;
|
|
}
|
|
if ((pcjr->sc == (pcjr->crtc[10] & 31) || ((pcjr->crtc[8] & 3) == 3 && pcjr->sc == ((pcjr->crtc[10] & 31) >> 1))))
|
|
pcjr->con = 1;
|
|
}
|
|
}
|
|
|
|
static void *pcjr_video_init()
|
|
{
|
|
int display_type;
|
|
pcjr_t *pcjr = malloc(sizeof(pcjr_t));
|
|
memset(pcjr, 0, sizeof(pcjr_t));
|
|
|
|
display_type = model_get_config_int("display_type");
|
|
pcjr->composite = (display_type != PCJR_RGB);
|
|
|
|
pcjr->memctrl = -1;
|
|
|
|
timer_add(pcjr_poll, &pcjr->vidtime, TIMER_ALWAYS_ENABLED, pcjr);
|
|
mem_mapping_add(&pcjr->mapping, 0xb8000, 0x08000, pcjr_read, NULL, NULL, pcjr_write, NULL, NULL, NULL, 0, pcjr);
|
|
io_sethandler(0x03d0, 0x0010, pcjr_in, NULL, NULL, pcjr_out, NULL, NULL, pcjr);
|
|
return pcjr;
|
|
}
|
|
|
|
static void pcjr_video_close(void *p)
|
|
{
|
|
pcjr_t *pcjr = (pcjr_t *)p;
|
|
|
|
free(pcjr);
|
|
}
|
|
|
|
static void pcjr_speed_changed(void *p)
|
|
{
|
|
pcjr_t *pcjr = (pcjr_t *)p;
|
|
|
|
pcjr_recalctimings(pcjr);
|
|
}
|
|
|
|
device_t pcjr_video_device =
|
|
{
|
|
"IBM PCjr (video)",
|
|
0,
|
|
pcjr_video_init,
|
|
pcjr_video_close,
|
|
NULL,
|
|
pcjr_speed_changed,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
static device_config_t pcjr_config[] =
|
|
{
|
|
{
|
|
"display_type", "Display type", CONFIG_SELECTION, "", PCJR_RGB,
|
|
{
|
|
{
|
|
"RGB", PCJR_RGB
|
|
},
|
|
{
|
|
"Composite", PCJR_COMPOSITE
|
|
},
|
|
{
|
|
""
|
|
}
|
|
}
|
|
},
|
|
{
|
|
"", "", -1
|
|
}
|
|
};
|
|
|
|
/*This isn't really a device as such - more of a convenient way to hook in the
|
|
config information*/
|
|
device_t pcjr_device =
|
|
{
|
|
"IBM PCjr",
|
|
0,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
pcjr_config
|
|
};
|