549 lines
24 KiB
C
549 lines
24 KiB
C
/*PC1512 CGA emulation
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The PC1512 extends CGA with a bit-planar 640x200x16 mode.
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Most CRTC registers are fixed.
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The Technical Reference Manual lists the video waitstate time as between 12
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and 46 cycles. PCem currently always uses the lower number.*/
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#include <stdlib.h>
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#include "ibm.h"
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#include "device.h"
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#include "io.h"
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#include "mem.h"
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#include "timer.h"
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#include "video.h"
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#include "vid_pc1512.h"
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typedef struct pc1512_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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uint8_t cgacol, cgamode, stat;
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uint8_t plane_write, plane_read, border;
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int fontbase;
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int linepos, displine;
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int sc, vc;
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int cgadispon;
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int con, coff, cursoron, cgablink;
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int vsynctime, vadj;
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uint16_t ma, maback;
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int dispon;
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int blink;
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uint64_t dispontime, dispofftime;
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pc_timer_t timer;
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int firstline, lastline;
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uint8_t *vram;
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} pc1512_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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static void pc1512_recalctimings(pc1512_t *pc1512);
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static void pc1512_out(uint16_t addr, uint8_t val, void *p)
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{
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pc1512_t *pc1512 = (pc1512_t *)p;
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uint8_t old;
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// pclog("PC1512 out %04X %02X %04X:%04X\n",addr,val,CS,pc);
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switch (addr)
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{
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case 0x3d4:
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pc1512->crtcreg = val & 31;
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return;
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case 0x3d5:
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old = pc1512->crtc[pc1512->crtcreg];
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pc1512->crtc[pc1512->crtcreg] = val & crtcmask[pc1512->crtcreg];
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if (old != val)
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{
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if (pc1512->crtcreg < 0xe || pc1512->crtcreg > 0x10)
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{
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fullchange = changeframecount;
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pc1512_recalctimings(pc1512);
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}
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}
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return;
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case 0x3d8:
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if ((val & 0x12) == 0x12 && (pc1512->cgamode & 0x12) != 0x12)
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{
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pc1512->plane_write = 0xf;
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pc1512->plane_read = 0;
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}
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pc1512->cgamode = val;
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return;
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case 0x3d9:
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pc1512->cgacol = val;
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return;
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case 0x3dd:
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pc1512->plane_write = val;
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return;
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case 0x3de:
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pc1512->plane_read = val & 3;
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return;
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case 0x3df:
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pc1512->border = val;
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return;
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}
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}
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static uint8_t pc1512_in(uint16_t addr, void *p)
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{
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pc1512_t *pc1512 = (pc1512_t *)p;
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// pclog("PC1512 in %04X %02X %04X:%04X\n",addr,CS,pc);
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switch (addr)
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{
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case 0x3d4:
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return pc1512->crtcreg;
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case 0x3d5:
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return pc1512->crtc[pc1512->crtcreg];
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case 0x3da:
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pc1512->stat ^= 0x01; /*Bit 0 is toggle bit on PC1512*/
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return pc1512->stat ^ 0x01;
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}
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return 0xff;
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}
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static void pc1512_write(uint32_t addr, uint8_t val, void *p)
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{
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pc1512_t *pc1512 = (pc1512_t *)p;
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egawrites++;
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cycles -= 12;
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addr &= 0x3fff;
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if ((pc1512->cgamode & 0x12) == 0x12)
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{
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if (pc1512->plane_write & 1) pc1512->vram[addr] = val;
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if (pc1512->plane_write & 2) pc1512->vram[addr | 0x4000] = val;
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if (pc1512->plane_write & 4) pc1512->vram[addr | 0x8000] = val;
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if (pc1512->plane_write & 8) pc1512->vram[addr | 0xc000] = val;
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}
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else
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pc1512->vram[addr] = val;
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}
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static uint8_t pc1512_read(uint32_t addr, void *p)
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{
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pc1512_t *pc1512 = (pc1512_t *)p;
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egareads++;
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cycles -= 12;
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addr &= 0x3fff;
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if ((pc1512->cgamode & 0x12) == 0x12)
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return pc1512->vram[addr | (pc1512->plane_read << 14)];
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return pc1512->vram[addr];
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}
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static void pc1512_recalctimings(pc1512_t *pc1512)
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{
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double _dispontime, _dispofftime, disptime;
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disptime = 114; /*Fixed on PC1512*/
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_dispontime = 80;
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_dispofftime = disptime - _dispontime;
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// printf("%i %f %f %f %i %i\n",cgamode&1,disptime,dispontime,dispofftime,crtc[0],crtc[1]);
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_dispontime *= CGACONST;
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_dispofftime *= CGACONST;
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// printf("Timings - on %f off %f frame %f second %f\n",dispontime,dispofftime,(dispontime+dispofftime)*262.0,(dispontime+dispofftime)*262.0*59.92);
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pc1512->dispontime = (uint64_t)_dispontime;
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pc1512->dispofftime = (uint64_t)_dispofftime;
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}
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static void pc1512_poll(void *p)
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{
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pc1512_t *pc1512 = (pc1512_t *)p;
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uint16_t ca = (pc1512->crtc[15] | (pc1512->crtc[14] << 8)) & 0x3fff;
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int drawcursor;
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int x, c;
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uint8_t chr, attr;
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uint16_t dat, dat2, dat3, dat4;
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int cols[4];
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int col;
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int oldsc;
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if (!pc1512->linepos)
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{
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timer_advance_u64(&pc1512->timer, pc1512->dispofftime);
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pc1512->linepos = 1;
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oldsc = pc1512->sc;
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if (pc1512->dispon)
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{
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if (pc1512->displine < pc1512->firstline)
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{
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pc1512->firstline = pc1512->displine;
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video_wait_for_buffer();
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}
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pc1512->lastline = pc1512->displine;
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for (c = 0; c < 8; c++)
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{
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if ((pc1512->cgamode & 0x12) == 0x12)
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{
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((uint32_t *)buffer32->line[pc1512->displine])[c] = cgapal[pc1512->border & 15];
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if (pc1512->cgamode & 1) ((uint32_t *)buffer32->line[pc1512->displine])[c + (pc1512->crtc[1] << 3) + 8] = 0;
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else ((uint32_t *)buffer32->line[pc1512->displine])[c + (pc1512->crtc[1] << 4) + 8] = 0;
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}
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else
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{
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((uint32_t *)buffer32->line[pc1512->displine])[c] = cgapal[pc1512->cgacol & 15];
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if (pc1512->cgamode & 1) ((uint32_t *)buffer32->line[pc1512->displine])[c + (pc1512->crtc[1] << 3) + 8] = cgapal[pc1512->cgacol & 15];
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else ((uint32_t *)buffer32->line[pc1512->displine])[c + (pc1512->crtc[1] << 4) + 8] = cgapal[pc1512->cgacol & 15];
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}
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}
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if (pc1512->cgamode & 1)
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{
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for (x = 0; x < 80; x++)
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{
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chr = pc1512->vram[ ((pc1512->ma << 1) & 0x3fff)];
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attr = pc1512->vram[(((pc1512->ma << 1) + 1) & 0x3fff)];
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drawcursor = ((pc1512->ma == ca) && pc1512->con && pc1512->cursoron);
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if (pc1512->cgamode & 0x20)
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{
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cols[1] = cgapal[attr & 15];
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cols[0] = cgapal[(attr >> 4) & 7];
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if ((pc1512->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] = cgapal[attr & 15];
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cols[0] = cgapal[attr >> 4];
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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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((uint32_t *)buffer32->line[pc1512->displine])[(x << 3) + c + 8] = cols[(fontdat[chr + pc1512->fontbase][pc1512->sc & 7] & (1 << (c ^ 7))) ? 1 : 0] ^ 0xffffff;
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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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((uint32_t *)buffer32->line[pc1512->displine])[(x << 3) + c + 8] = cols[(fontdat[chr + pc1512->fontbase][pc1512->sc & 7] & (1 << (c ^ 7))) ? 1 : 0];
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}
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pc1512->ma++;
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}
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}
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else if (!(pc1512->cgamode & 2))
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{
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for (x = 0; x < 40; x++)
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{
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chr = pc1512->vram[ ((pc1512->ma << 1) & 0x3fff)];
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attr = pc1512->vram[(((pc1512->ma << 1) + 1) & 0x3fff)];
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drawcursor = ((pc1512->ma == ca) && pc1512->con && pc1512->cursoron);
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if (pc1512->cgamode & 0x20)
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{
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cols[1] = cgapal[attr & 15];
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cols[0] = cgapal[(attr >> 4) & 7];
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if ((pc1512->blink & 16) && (attr & 0x80))
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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] = cgapal[attr & 15];
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cols[0] = cgapal[attr >> 4];
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}
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pc1512->ma++;
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if (drawcursor)
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{
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for (c = 0; c < 8; c++)
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((uint32_t *)buffer32->line[pc1512->displine])[(x << 4) + (c << 1) + 8] =
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((uint32_t *)buffer32->line[pc1512->displine])[(x << 4) + (c << 1) + 1 + 8] = cols[(fontdat[chr + pc1512->fontbase][pc1512->sc & 7] & (1 << (c ^ 7))) ? 1 : 0] ^ 0xffffff;
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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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((uint32_t *)buffer32->line[pc1512->displine])[(x << 4) + (c << 1) + 8] =
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((uint32_t *)buffer32->line[pc1512->displine])[(x << 4) + (c << 1) + 1 + 8] = cols[(fontdat[chr + pc1512->fontbase][pc1512->sc & 7] & (1 << (c ^ 7))) ? 1 : 0];
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}
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}
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}
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else if (!(pc1512->cgamode&16))
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{
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cols[0] = cgapal[pc1512->cgacol & 15];
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col = (pc1512->cgacol & 16) ? 8 : 0;
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if (pc1512->cgamode & 4)
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{
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cols[1] = cgapal[col | 3];
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cols[2] = cgapal[col | 4];
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cols[3] = cgapal[col | 7];
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}
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else if (pc1512->cgacol & 32)
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{
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cols[1] = cgapal[col | 3];
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cols[2] = cgapal[col | 5];
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cols[3] = cgapal[col | 7];
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}
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else
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{
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cols[1] = cgapal[col | 2];
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cols[2] = cgapal[col | 4];
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cols[3] = cgapal[col | 6];
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}
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for (x = 0; x < 40; x++)
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{
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dat = (pc1512->vram[((pc1512->ma << 1) & 0x1fff) + ((pc1512->sc & 1) * 0x2000)] << 8) | pc1512->vram[((pc1512->ma << 1) & 0x1fff) + ((pc1512->sc & 1) * 0x2000) + 1];
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pc1512->ma++;
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for (c = 0; c < 8; c++)
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{
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((uint32_t *)buffer32->line[pc1512->displine])[(x << 4) + (c << 1) + 8] =
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((uint32_t *)buffer32->line[pc1512->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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}
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else
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{
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for (x = 0; x < 40; x++)
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{
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ca = ((pc1512->ma << 1) & 0x1fff) + ((pc1512->sc & 1) * 0x2000);
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dat = (pc1512->vram[ca] << 8) | pc1512->vram[ca + 1];
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dat2 = (pc1512->vram[ca + 0x4000] << 8) | pc1512->vram[ca + 0x4001];
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dat3 = (pc1512->vram[ca + 0x8000] << 8) | pc1512->vram[ca + 0x8001];
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dat4 = (pc1512->vram[ca + 0xc000] << 8) | pc1512->vram[ca + 0xc001];
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pc1512->ma++;
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for (c = 0; c < 16; c++)
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{
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((uint32_t *)buffer32->line[pc1512->displine])[(x << 4) + c + 8] = cgapal[((dat >> 15) | ((dat2 >> 15) << 1) | ((dat3 >> 15) << 2) | ((dat4 >> 15) << 3)) & (pc1512->cgacol & 15)];
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dat <<= 1;
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dat2 <<= 1;
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dat3 <<= 1;
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dat4 <<= 1;
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}
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}
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}
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}
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else
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{
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cols[0] = cgapal[((pc1512->cgamode & 0x12) == 0x12) ? 0 : (pc1512->cgacol & 15)];
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if (pc1512->cgamode & 1) hline(buffer32, 0, pc1512->displine, (pc1512->crtc[1] << 3) + 16, cols[0]);
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else hline(buffer32, 0, pc1512->displine, (pc1512->crtc[1] << 4) + 16, cols[0]);
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}
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pc1512->sc = oldsc;
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if (pc1512->vsynctime)
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pc1512->stat |= 8;
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pc1512->displine++;
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if (pc1512->displine >= 360)
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pc1512->displine = 0;
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// pclog("Line %i %i %i %i %i %i\n",displine,cgadispon,firstline,lastline,vc,sc);
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}
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else
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{
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timer_advance_u64(&pc1512->timer, pc1512->dispontime);
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if ((pc1512->lastline - pc1512->firstline) == 199)
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pc1512->dispon = 0; /*Amstrad PC1512 always displays 200 lines, regardless of CRTC settings*/
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pc1512->linepos = 0;
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if (pc1512->vsynctime)
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{
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pc1512->vsynctime--;
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if (!pc1512->vsynctime)
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pc1512->stat &= ~8;
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}
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if (pc1512->sc == (pc1512->crtc[11] & 31))
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{
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pc1512->con = 0;
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pc1512->coff = 1;
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}
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if (pc1512->vadj)
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{
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pc1512->sc++;
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pc1512->sc &= 31;
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pc1512->ma = pc1512->maback;
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pc1512->vadj--;
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if (!pc1512->vadj)
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{
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pc1512->dispon = 1;
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pc1512->ma = pc1512->maback = (pc1512->crtc[13] | (pc1512->crtc[12] << 8)) & 0x3fff;
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pc1512->sc = 0;
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}
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}
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else if (pc1512->sc == pc1512->crtc[9])
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{
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pc1512->maback = pc1512->ma;
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pc1512->sc = 0;
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pc1512->vc++;
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pc1512->vc &= 127;
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if (pc1512->displine == 32)//oldvc == (cgamode & 2) ? 127 : 31)
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{
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pc1512->vc = 0;
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pc1512->vadj = 6;
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if ((pc1512->crtc[10] & 0x60) == 0x20) pc1512->cursoron = 0;
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else pc1512->cursoron = pc1512->blink & 16;
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}
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if (pc1512->displine >= 262)//vc == (cgamode & 2) ? 111 : 27)
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{
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pc1512->dispon = 0;
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pc1512->displine = 0;
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pc1512->vsynctime = 46;
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if (pc1512->cgamode&1) x = (pc1512->crtc[1] << 3) + 16;
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else x = (pc1512->crtc[1] << 4) + 16;
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x = 640 + 16;
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pc1512->lastline++;
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if (x != xsize || (pc1512->lastline - pc1512->firstline) != ysize)
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{
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xsize = x;
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ysize = pc1512->lastline - pc1512->firstline;
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if (xsize < 64) xsize = 656;
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if (ysize < 32) ysize = 200;
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updatewindowsize(xsize, (ysize << 1) + 16);
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}
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video_blit_memtoscreen(0, pc1512->firstline - 4, 0, (pc1512->lastline - pc1512->firstline) + 8, xsize, (pc1512->lastline - pc1512->firstline) + 8);
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// blit(buffer,vbuf,0,firstline-4,0,0,xsize,(lastline-firstline)+8+1);
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// if (vid_resize) stretch_blit(vbuf,screen,0,0,xsize,(lastline-firstline)+8+1,0,0,winsizex,winsizey);
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// else stretch_blit(vbuf,screen,0,0,xsize,(lastline-firstline)+8+1,0,0,xsize,((lastline-firstline)<<1)+16+2);
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// if (readflash) rectfill(screen,winsizex-40,8,winsizex-8,14,0xFFFFFFFF);
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// readflash=0;
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video_res_x = xsize - 16;
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video_res_y = ysize;
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if (pc1512->cgamode & 1)
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{
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video_res_x /= 8;
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video_res_y /= pc1512->crtc[9] + 1;
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video_bpp = 0;
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}
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else if (!(pc1512->cgamode & 2))
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{
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video_res_x /= 16;
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video_res_y /= pc1512->crtc[9] + 1;
|
|
video_bpp = 0;
|
|
}
|
|
else if (!(pc1512->cgamode & 16))
|
|
{
|
|
video_res_x /= 2;
|
|
video_bpp = 2;
|
|
}
|
|
else
|
|
{
|
|
video_bpp = 4;
|
|
}
|
|
|
|
pc1512->firstline = 1000;
|
|
pc1512->lastline = 0;
|
|
pc1512->blink++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
pc1512->sc++;
|
|
pc1512->sc &= 31;
|
|
pc1512->ma = pc1512->maback;
|
|
}
|
|
if (pc1512->sc == (pc1512->crtc[10] & 31))
|
|
pc1512->con = 1;
|
|
}
|
|
}
|
|
|
|
static void *pc1512_init()
|
|
{
|
|
int display_type;
|
|
pc1512_t *pc1512 = malloc(sizeof(pc1512_t));
|
|
memset(pc1512, 0, sizeof(pc1512_t));
|
|
|
|
pc1512->vram = malloc(0x10000);
|
|
|
|
pc1512->cgacol = 7;
|
|
pc1512->cgamode = 0x12;
|
|
pc1512->fontbase = (device_get_config_int("codepage") & 3) * 256;
|
|
display_type = device_get_config_int("display_type");
|
|
|
|
timer_add(&pc1512->timer, pc1512_poll, pc1512, 1);
|
|
mem_mapping_add(&pc1512->mapping, 0xb8000, 0x08000, pc1512_read, NULL, NULL, pc1512_write, NULL, NULL, NULL, 0, pc1512);
|
|
io_sethandler(0x03d0, 0x0010, pc1512_in, NULL, NULL, pc1512_out, NULL, NULL, pc1512);
|
|
cgapal_rebuild(display_type, 0);
|
|
return pc1512;
|
|
}
|
|
|
|
static void pc1512_close(void *p)
|
|
{
|
|
pc1512_t *pc1512 = (pc1512_t *)p;
|
|
|
|
free(pc1512->vram);
|
|
free(pc1512);
|
|
}
|
|
|
|
static void pc1512_speed_changed(void *p)
|
|
{
|
|
pc1512_t *pc1512 = (pc1512_t *)p;
|
|
|
|
pc1512_recalctimings(pc1512);
|
|
}
|
|
|
|
device_config_t pc1512_config[] =
|
|
{
|
|
{
|
|
.name = "display_type",
|
|
.description = "Display type",
|
|
.type = CONFIG_SELECTION,
|
|
.selection =
|
|
{
|
|
{
|
|
.description = "PC-CM (Colour)",
|
|
.value = DISPLAY_RGB
|
|
},
|
|
{
|
|
.description = "PC-MM (Monochrome)",
|
|
.value = DISPLAY_WHITE
|
|
},
|
|
{
|
|
.description = ""
|
|
}
|
|
}
|
|
},
|
|
{
|
|
.name = "codepage",
|
|
.description = "Hardware font",
|
|
.type = CONFIG_SELECTION,
|
|
.selection =
|
|
{
|
|
{
|
|
.description = "US English",
|
|
.value = 3
|
|
},
|
|
{
|
|
.description = "Danish",
|
|
.value = 1
|
|
},
|
|
{
|
|
.description = "Greek",
|
|
.value = 0
|
|
},
|
|
{
|
|
.description = ""
|
|
}
|
|
},
|
|
.default_int = 3
|
|
},
|
|
{
|
|
.type = -1
|
|
}
|
|
};
|
|
|
|
|
|
device_t pc1512_device =
|
|
{
|
|
"Amstrad PC1512 (video)",
|
|
0,
|
|
pc1512_init,
|
|
pc1512_close,
|
|
NULL,
|
|
pc1512_speed_changed,
|
|
NULL,
|
|
NULL,
|
|
pc1512_config
|
|
};
|