a7d006b637
The new code is based on timestamps, rather than delays. This eliminates the need to update every timer in timer_process(), which cost a non-trivial amount of CPU time on low-end machines. This involved changes to every user of the timer code, so this change almost certainly introduces bugs.
393 lines
18 KiB
C
393 lines
18 KiB
C
/*Compaq CGA emulation*/
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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_cga.h"
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#include "vid_compaq_cga.h"
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typedef struct compaq_cga_t
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{
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cga_t cga;
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} compaq_cga_t;
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static uint8_t mdaattr[256][2][2];
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void compaq_cga_recalctimings(compaq_cga_t *self)
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{
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double _dispontime, _dispofftime, disptime;
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disptime = self->cga.crtc[0] + 1;
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_dispontime = self->cga.crtc[1];
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_dispofftime = disptime - _dispontime;
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_dispontime *= MDACONST;
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_dispofftime *= MDACONST;
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self->cga.dispontime = (uint64_t)_dispontime;
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self->cga.dispofftime = (uint64_t)_dispofftime;
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}
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void compaq_cga_poll(void *p)
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{
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compaq_cga_t *self = (compaq_cga_t *)p;
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uint16_t ca = (self->cga.crtc[15] | (self->cga.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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uint32_t cols[4];
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int oldsc;
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int underline;
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int blink;
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/* If in graphics mode or character height is not 13, behave as CGA */
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if ((self->cga.cgamode & 0x12) || (self->cga.crtc[9] != 13))
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{
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cga_poll(&self->cga);
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return;
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}
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/* We are in Compaq 350-line CGA territory */
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if (!self->cga.linepos)
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{
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timer_advance_u64(&self->cga.timer, self->cga.dispofftime);
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self->cga.cgastat |= 1;
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self->cga.linepos = 1;
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oldsc = self->cga.sc;
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if ((self->cga.crtc[8] & 3) == 3)
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self->cga.sc = ((self->cga.sc << 1) + self->cga.oddeven) & 7;
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if (self->cga.cgadispon)
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{
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if (self->cga.displine < self->cga.firstline)
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{
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self->cga.firstline = self->cga.displine;
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video_wait_for_buffer();
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// printf("Firstline %i\n",firstline);
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}
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self->cga.lastline = self->cga.displine;
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cols[0] = (self->cga.cgacol & 15);
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for (c = 0; c < 8; c++)
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{
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((uint32_t *)buffer32->line[self->cga.displine])[c] = cols[0];
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if (self->cga.cgamode & 1)
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((uint32_t *)buffer32->line[self->cga.displine])[c + (self->cga.crtc[1] << 3) + 8] = cols[0];
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else
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((uint32_t *)buffer32->line[self->cga.displine])[c + (self->cga.crtc[1] << 4) + 8] = cols[0];
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}
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if (self->cga.cgamode & 1)
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{
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for (x = 0; x < self->cga.crtc[1]; x++)
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{
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chr = self->cga.charbuffer[x << 1];
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attr = self->cga.charbuffer[(x << 1) + 1];
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drawcursor = ((self->cga.ma == ca) && self->cga.con && self->cga.cursoron);
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underline = 0;
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blink = ((self->cga.cgablink & 8) && (self->cga.cgamode & 0x20) && (attr & 0x80) && !drawcursor);
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if (self->cga.cgamode & 0x80)
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{
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cols[0] = mdaattr[attr][blink][0];
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cols[1] = mdaattr[attr][blink][1];
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if (self->cga.sc == 12 && (attr & 7) == 1) underline = 1;
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}
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else if (self->cga.cgamode & 0x20)
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{
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cols[1] = attr & 15;
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cols[0] = (attr >> 4) & 7;
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if (blink)
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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] = attr & 15;
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cols[0] = attr >> 4;
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}
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if (underline)
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{
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for (c = 0; c < 8; c++)
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((uint32_t *)buffer32->line[self->cga.displine])[(x << 3) + c + 8] = mdaattr[attr][blink][1];
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}
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else if (drawcursor)
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{
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for (c = 0; c < 8; c++)
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((uint32_t *)buffer32->line[self->cga.displine])[(x << 3) + c + 8] = cols[(fontdatm[chr + self->cga.fontbase][self->cga.sc & 15] & (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[self->cga.displine])[(x << 3) + c + 8] = cols[(fontdatm[chr + self->cga.fontbase][self->cga.sc & 15] & (1 << (c ^ 7))) ? 1 : 0];
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}
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self->cga.ma++;
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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 < self->cga.crtc[1]; x++)
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{
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chr = self->cga.vram[((self->cga.ma << 1) & 0x3fff)];
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attr = self->cga.vram[(((self->cga.ma << 1) + 1) & 0x3fff)];
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drawcursor = ((self->cga.ma == ca) && self->cga.con && self->cga.cursoron);
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underline = 0;
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blink = ((self->cga.cgablink & 8) && (self->cga.cgamode & 0x20) && (attr & 0x80) && !drawcursor);
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if (self->cga.cgamode & 0x80)
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{
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cols[0] = mdaattr[attr][blink][0];
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cols[1] = mdaattr[attr][blink][1];
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if (self->cga.sc == 12 && (attr & 7) == 1) underline = 1;
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}
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else if (self->cga.cgamode & 0x20)
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{
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cols[1] = attr & 15;
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cols[0] = (attr >> 4) & 7;
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if (blink)
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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] = attr & 15;
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cols[0] = attr >> 4;
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}
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self->cga.ma++;
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if (underline)
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{
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for (c = 0; c < 8; c++)
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((uint32_t *)buffer32->line[self->cga.displine])[(x << 4)+(c << 1) + 8] =
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((uint32_t *)buffer32->line[self->cga.displine])[(x << 4)+(c << 1) + 9] = mdaattr[attr][blink][1];
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}
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else if (drawcursor)
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{
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for (c = 0; c < 8; c++)
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((uint32_t *)buffer32->line[self->cga.displine])[(x << 4)+(c << 1) + 8] =
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((uint32_t *)buffer32->line[self->cga.displine])[(x << 4) + (c << 1) + 1 + 8] = cols[(fontdatm[chr + self->cga.fontbase][self->cga.sc & 15] & (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[self->cga.displine])[(x << 4) + (c << 1) + 8] =
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((uint32_t *)buffer32->line[self->cga.displine])[(x << 4) + (c << 1) + 1 + 8] = cols[(fontdatm[chr + self->cga.fontbase][self->cga.sc & 15] & (1 << (c ^ 7))) ? 1 : 0];
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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] = (self->cga.cgacol & 15);
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if (self->cga.cgamode & 1) hline(buffer32, 0, self->cga.displine, (self->cga.crtc[1] << 3) + 16, cols[0]);
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else hline(buffer32, 0, self->cga.displine, (self->cga.crtc[1] << 4) + 16, cols[0]);
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}
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if (self->cga.cgamode & 1) x = (self->cga.crtc[1] << 3) + 16;
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else x = (self->cga.crtc[1] << 4) + 16;
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for (c = 0; c < x; c++)
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((uint32_t *)buffer32->line[self->cga.displine])[c] = cgapal[((uint32_t *)buffer32->line[self->cga.displine])[c] & 0xf];
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self->cga.sc = oldsc;
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if (self->cga.vc == self->cga.crtc[7] && !self->cga.sc)
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self->cga.cgastat |= 8;
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self->cga.displine++;
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if (self->cga.displine >= 500)
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self->cga.displine = 0;
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}
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else
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{
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timer_advance_u64(&self->cga.timer, self->cga.dispontime);
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self->cga.linepos = 0;
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if (self->cga.vsynctime)
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{
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self->cga.vsynctime--;
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if (!self->cga.vsynctime)
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self->cga.cgastat &= ~8;
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}
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if (self->cga.sc == (self->cga.crtc[11] & 31) || ((self->cga.crtc[8] & 3) == 3 && self->cga.sc == ((self->cga.crtc[11] & 31) >> 1)))
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{
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self->cga.con = 0;
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self->cga.coff = 1;
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}
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if ((self->cga.crtc[8] & 3) == 3 && self->cga.sc == (self->cga.crtc[9] >> 1))
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self->cga.maback = self->cga.ma;
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if (self->cga.vadj)
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{
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self->cga.sc++;
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self->cga.sc &= 31;
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self->cga.ma = self->cga.maback;
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self->cga.vadj--;
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if (!self->cga.vadj)
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{
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self->cga.cgadispon = 1;
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self->cga.ma = self->cga.maback = (self->cga.crtc[13] | (self->cga.crtc[12] << 8)) & 0x3fff;
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self->cga.sc = 0;
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}
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}
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else if (self->cga.sc == self->cga.crtc[9])
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{
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self->cga.maback = self->cga.ma;
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self->cga.sc = 0;
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oldvc = self->cga.vc;
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self->cga.vc++;
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self->cga.vc &= 127;
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if (self->cga.vc == self->cga.crtc[6])
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self->cga.cgadispon = 0;
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if (oldvc == self->cga.crtc[4])
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{
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self->cga.vc = 0;
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self->cga.vadj = self->cga.crtc[5];
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if (!self->cga.vadj) self->cga.cgadispon = 1;
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if (!self->cga.vadj) self->cga.ma = self->cga.maback = (self->cga.crtc[13] | (self->cga.crtc[12] << 8)) & 0x3fff;
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if ((self->cga.crtc[10] & 0x60) == 0x20) self->cga.cursoron = 0;
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else self->cga.cursoron = self->cga.cgablink & 8;
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}
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if (self->cga.vc == self->cga.crtc[7])
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{
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self->cga.cgadispon = 0;
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self->cga.displine = 0;
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self->cga.vsynctime = 16;
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if (self->cga.crtc[7])
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{
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if (self->cga.cgamode & 1) x = (self->cga.crtc[1] << 3) + 16;
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else x = (self->cga.crtc[1] << 4) + 16;
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self->cga.lastline++;
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if (x != xsize || (self->cga.lastline - self->cga.firstline) != ysize)
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{
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xsize = x;
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ysize = self->cga.lastline - self->cga.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 + 16);
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}
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video_blit_memtoscreen(0, self->cga.firstline - 4, 0, (self->cga.lastline - self->cga.firstline) + 8, xsize, (self->cga.lastline - self->cga.firstline) + 8);
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frames++;
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video_res_x = xsize - 16;
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video_res_y = ysize;
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if (self->cga.cgamode & 1)
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{
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video_res_x /= 8;
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video_res_y /= self->cga.crtc[9] + 1;
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video_bpp = 0;
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}
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else if (!(self->cga.cgamode & 2))
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{
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video_res_x /= 16;
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video_res_y /= self->cga.crtc[9] + 1;
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video_bpp = 0;
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}
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else if (!(self->cga.cgamode & 16))
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{
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video_res_x /= 2;
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video_bpp = 2;
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}
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else
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{
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video_bpp = 1;
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}
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}
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self->cga.firstline = 1000;
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self->cga.lastline = 0;
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self->cga.cgablink++;
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self->cga.oddeven ^= 1;
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}
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}
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else
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{
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self->cga.sc++;
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self->cga.sc &= 31;
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self->cga.ma = self->cga.maback;
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}
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if (self->cga.cgadispon)
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self->cga.cgastat &= ~1;
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if ((self->cga.sc == (self->cga.crtc[10] & 31) || ((self->cga.crtc[8] & 3) == 3 && self->cga.sc == ((self->cga.crtc[10] & 31) >> 1))))
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self->cga.con = 1;
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if (self->cga.cgadispon && (self->cga.cgamode & 1))
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{
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for (x = 0; x < (self->cga.crtc[1] << 1); x++)
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self->cga.charbuffer[x] = self->cga.vram[(((self->cga.ma << 1) + x) & 0x3fff)];
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}
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}
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}
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void *compaq_cga_init()
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{
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int display_type;
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int contrast;
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int c;
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compaq_cga_t *self = malloc(sizeof(compaq_cga_t));
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memset(self, 0, sizeof(compaq_cga_t));
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self->cga.vram = malloc(0x4000);
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timer_add(&self->cga.timer, compaq_cga_poll, self, 1);
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mem_mapping_add(&self->cga.mapping, 0xb8000, 0x08000, cga_read, NULL, NULL, cga_write, NULL, NULL, NULL, MEM_MAPPING_EXTERNAL, self);
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io_sethandler(0x03d0, 0x0010, cga_in, NULL, NULL, cga_out, NULL, NULL, self);
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display_type = device_get_config_int("display_type");
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contrast = device_get_config_int("contrast");
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cgapal_rebuild(display_type, contrast);
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for (c = 0; c < 256; c++)
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{
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mdaattr[c][0][0] = mdaattr[c][1][0] = mdaattr[c][1][1] = 0;
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if (c & 8) mdaattr[c][0][1] = 0xf;
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else mdaattr[c][0][1] = 0x7;
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}
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mdaattr[0x70][0][1] = 0;
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mdaattr[0x70][0][0] = mdaattr[0x70][1][0] = mdaattr[0x70][1][1] = 0xf;
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mdaattr[0xF0][0][1] = 0;
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mdaattr[0xF0][0][0] = mdaattr[0xF0][1][0] = mdaattr[0xF0][1][1] = 0xf;
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mdaattr[0x78][0][1] = 0x7;
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mdaattr[0x78][0][0] = mdaattr[0x78][1][0] = mdaattr[0x78][1][1] = 0xf;
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mdaattr[0xF8][0][1] = 0x7;
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mdaattr[0xF8][0][0] = mdaattr[0xF8][1][0] = mdaattr[0xF8][1][1] = 0xf;
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mdaattr[0x00][0][1] = mdaattr[0x00][1][1] = 0;
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mdaattr[0x08][0][1] = mdaattr[0x08][1][1] = 0;
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mdaattr[0x80][0][1] = mdaattr[0x80][1][1] = 0;
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mdaattr[0x88][0][1] = mdaattr[0x88][1][1] = 0;
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return self;
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}
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void compaq_cga_close(void *p)
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{
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compaq_cga_t *self = (compaq_cga_t *)p;
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free(self->cga.vram);
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free(self);
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}
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void compaq_cga_speed_changed(void *p)
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{
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compaq_cga_t *self = (compaq_cga_t *)p;
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if (self->cga.crtc[9] == 13) /* Character height */
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{
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compaq_cga_recalctimings(self);
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}
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else
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{
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cga_recalctimings(&self->cga);
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}
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}
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extern device_config_t cga_config[];
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device_t compaq_cga_device =
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{
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"Compaq CGA",
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0,
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compaq_cga_init,
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compaq_cga_close,
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NULL,
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compaq_cga_speed_changed,
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NULL,
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NULL,
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cga_config
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};
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