429 lines
19 KiB
C
429 lines
19 KiB
C
/*Plantronics ColorPlus emulation*/
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#include <stdlib.h>
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#include <math.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_colorplus.h"
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typedef struct colorplus_t
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{
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cga_t cga;
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uint8_t control;
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} colorplus_t;
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/* Bits in the colorplus control register: */
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#define COLORPLUS_PLANE_SWAP 0x40 /* Swap planes at 0000h and 4000h */
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#define COLORPLUS_640x200_MODE 0x20 /* 640x200x4 mode active */
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#define COLORPLUS_320x200_MODE 0x10 /* 320x200x16 mode active */
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#define COLORPLUS_EITHER_MODE 0x30 /* Either mode active */
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/* Bits in the CGA graphics mode register */
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#define CGA_GRAPHICS_MODE 0x02 /* CGA graphics mode selected? */
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void colorplus_out(uint16_t addr, uint8_t val, void *p)
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{
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colorplus_t *colorplus = (colorplus_t *)p;
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// pclog("COLORPLUS_OUT %04X %02X\n", addr, val);
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if (addr == 0x3DD)
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{
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colorplus->control = val & 0x70;
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}
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else
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{
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cga_out(addr, val, &colorplus->cga);
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}
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}
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uint8_t colorplus_in(uint16_t addr, void *p)
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{
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colorplus_t *colorplus = (colorplus_t *)p;
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return cga_in(addr, &colorplus->cga);
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}
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void colorplus_write(uint32_t addr, uint8_t val, void *p)
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{
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colorplus_t *colorplus = (colorplus_t *)p;
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// pclog("COLORPLUS_WRITE %04X %02X\n", addr, val);
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if ((colorplus->control & COLORPLUS_PLANE_SWAP) &&
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(colorplus->control & COLORPLUS_EITHER_MODE) &&
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(colorplus->cga.cgamode & CGA_GRAPHICS_MODE))
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{
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addr ^= 0x4000;
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}
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else if (!(colorplus->control & COLORPLUS_EITHER_MODE))
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{
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addr &= 0x3FFF;
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}
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colorplus->cga.vram[addr & 0x7fff] = val;
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egawrites++;
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cycles -= 4;
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}
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uint8_t colorplus_read(uint32_t addr, void *p)
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{
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colorplus_t *colorplus = (colorplus_t *)p;
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if ((colorplus->control & COLORPLUS_PLANE_SWAP) &&
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(colorplus->control & COLORPLUS_EITHER_MODE) &&
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(colorplus->cga.cgamode & CGA_GRAPHICS_MODE))
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{
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addr ^= 0x4000;
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}
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else if (!(colorplus->control & COLORPLUS_EITHER_MODE))
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{
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addr &= 0x3FFF;
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}
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cycles -= 4;
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egareads++;
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// pclog("COLORPLUS_READ %04X\n", addr);
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return colorplus->cga.vram[addr & 0x7fff];
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}
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void colorplus_recalctimings(colorplus_t *colorplus)
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{
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cga_recalctimings(&colorplus->cga);
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}
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void colorplus_poll(void *p)
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{
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colorplus_t *colorplus = (colorplus_t *)p;
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int x, c;
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int oldvc;
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uint16_t dat0, dat1;
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int cols[4];
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int col;
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int oldsc;
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static const int cols16[16] = { 0x0,0x2,0x4,0x6,
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0x8,0xA,0xC,0xE,
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0x1,0x3,0x5,0x7,
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0x9,0xB,0xD,0xF };
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uint8_t *plane0 = colorplus->cga.vram;
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uint8_t *plane1 = colorplus->cga.vram + 0x4000;
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/* If one of the extra modes is not selected, drop down to the CGA
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* drawing code. */
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if (!((colorplus->control & COLORPLUS_EITHER_MODE) &&
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(colorplus->cga.cgamode & CGA_GRAPHICS_MODE)))
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{
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cga_poll(&colorplus->cga);
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return;
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}
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if (!colorplus->cga.linepos)
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{
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colorplus->cga.vidtime += colorplus->cga.dispofftime;
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colorplus->cga.cgastat |= 1;
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colorplus->cga.linepos = 1;
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oldsc = colorplus->cga.sc;
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if ((colorplus->cga.crtc[8] & 3) == 3)
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colorplus->cga.sc = ((colorplus->cga.sc << 1) + colorplus->cga.oddeven) & 7;
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if (colorplus->cga.cgadispon)
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{
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if (colorplus->cga.displine < colorplus->cga.firstline)
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{
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colorplus->cga.firstline = colorplus->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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colorplus->cga.lastline = colorplus->cga.displine;
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/* Left / right border */
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for (c = 0; c < 8; c++)
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{
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((uint32_t *)buffer32->line[colorplus->cga.displine])[c] =
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((uint32_t *)buffer32->line[colorplus->cga.displine])[c + (colorplus->cga.crtc[1] << 4) + 8] = cgapal[colorplus->cga.cgacol & 15];
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}
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if (colorplus->control & COLORPLUS_320x200_MODE)
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{
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for (x = 0; x < colorplus->cga.crtc[1]; x++)
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{
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dat0 = (plane0[((colorplus->cga.ma << 1) & 0x1fff) + ((colorplus->cga.sc & 1) * 0x2000)] << 8) |
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plane0[((colorplus->cga.ma << 1) & 0x1fff) + ((colorplus->cga.sc & 1) * 0x2000) + 1];
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dat1 = (plane1[((colorplus->cga.ma << 1) & 0x1fff) + ((colorplus->cga.sc & 1) * 0x2000)] << 8) |
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plane1[((colorplus->cga.ma << 1) & 0x1fff) + ((colorplus->cga.sc & 1) * 0x2000) + 1];
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colorplus->cga.ma++;
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for (c = 0; c < 8; c++)
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{
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((uint32_t *)buffer32->line[colorplus->cga.displine])[(x << 4) + (c << 1) + 8] =
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((uint32_t *)buffer32->line[colorplus->cga.displine])[(x << 4) + (c << 1) + 1 + 8] =
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cgapal[cols16[(dat0 >> 14) | ((dat1 >> 14) << 2)]];
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dat0 <<= 2;
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dat1 <<= 2;
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}
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}
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}
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else if (colorplus->control & COLORPLUS_640x200_MODE)
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{
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cols[0] = cgapal[colorplus->cga.cgacol & 15];
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col = (colorplus->cga.cgacol & 16) ? 8 : 0;
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if (colorplus->cga.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 (colorplus->cga.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 < colorplus->cga.crtc[1]; x++)
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{
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dat0 = (plane0[((colorplus->cga.ma << 1) & 0x1fff) + ((colorplus->cga.sc & 1) * 0x2000)] << 8) |
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plane0[((colorplus->cga.ma << 1) & 0x1fff) + ((colorplus->cga.sc & 1) * 0x2000) + 1];
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dat1 = (plane1[((colorplus->cga.ma << 1) & 0x1fff) + ((colorplus->cga.sc & 1) * 0x2000)] << 8) |
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plane1[((colorplus->cga.ma << 1) & 0x1fff) + ((colorplus->cga.sc & 1) * 0x2000) + 1];
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colorplus->cga.ma++;
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for (c = 0; c < 16; c++)
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{
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((uint32_t *)buffer32->line[colorplus->cga.displine])[(x << 4) + c + 8] =
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cols[(dat0 >> 15) | ((dat1 >> 15) << 1)];
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dat0 <<= 1;
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dat1 <<= 1;
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}
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}
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}
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}
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else /* Top / bottom border */
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{
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cols[0] = cgapal[colorplus->cga.cgacol & 15];
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hline(buffer32, 0, colorplus->cga.displine, (colorplus->cga.crtc[1] << 4) + 16, cols[0]);
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}
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x = (colorplus->cga.crtc[1] << 4) + 16;
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colorplus->cga.sc = oldsc;
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if (colorplus->cga.vc == colorplus->cga.crtc[7] && !colorplus->cga.sc)
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colorplus->cga.cgastat |= 8;
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colorplus->cga.displine++;
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if (colorplus->cga.displine >= 360)
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colorplus->cga.displine = 0;
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}
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else
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{
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colorplus->cga.vidtime += colorplus->cga.dispontime;
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colorplus->cga.linepos = 0;
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if (colorplus->cga.vsynctime)
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{
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colorplus->cga.vsynctime--;
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if (!colorplus->cga.vsynctime)
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colorplus->cga.cgastat &= ~8;
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}
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if (colorplus->cga.sc == (colorplus->cga.crtc[11] & 31) || ((colorplus->cga.crtc[8] & 3) == 3 && colorplus->cga.sc == ((colorplus->cga.crtc[11] & 31) >> 1)))
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{
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colorplus->cga.con = 0;
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colorplus->cga.coff = 1;
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}
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if ((colorplus->cga.crtc[8] & 3) == 3 && colorplus->cga.sc == (colorplus->cga.crtc[9] >> 1))
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colorplus->cga.maback = colorplus->cga.ma;
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if (colorplus->cga.vadj)
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{
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colorplus->cga.sc++;
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colorplus->cga.sc &= 31;
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colorplus->cga.ma = colorplus->cga.maback;
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colorplus->cga.vadj--;
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if (!colorplus->cga.vadj)
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{
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colorplus->cga.cgadispon = 1;
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colorplus->cga.ma = colorplus->cga.maback = (colorplus->cga.crtc[13] | (colorplus->cga.crtc[12] << 8)) & 0x3fff;
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colorplus->cga.sc = 0;
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}
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}
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else if (colorplus->cga.sc == colorplus->cga.crtc[9])
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{
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colorplus->cga.maback = colorplus->cga.ma;
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colorplus->cga.sc = 0;
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oldvc = colorplus->cga.vc;
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colorplus->cga.vc++;
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colorplus->cga.vc &= 127;
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if (colorplus->cga.vc == colorplus->cga.crtc[6])
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colorplus->cga.cgadispon = 0;
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if (oldvc == colorplus->cga.crtc[4])
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{
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colorplus->cga.vc = 0;
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colorplus->cga.vadj = colorplus->cga.crtc[5];
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if (!colorplus->cga.vadj) colorplus->cga.cgadispon = 1;
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if (!colorplus->cga.vadj) colorplus->cga.ma = colorplus->cga.maback = (colorplus->cga.crtc[13] | (colorplus->cga.crtc[12] << 8)) & 0x3fff;
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if ((colorplus->cga.crtc[10] & 0x60) == 0x20) colorplus->cga.cursoron = 0;
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else colorplus->cga.cursoron = colorplus->cga.cgablink & 8;
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}
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if (colorplus->cga.vc == colorplus->cga.crtc[7])
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{
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colorplus->cga.cgadispon = 0;
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colorplus->cga.displine = 0;
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colorplus->cga.vsynctime = 16;
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if (colorplus->cga.crtc[7])
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{
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if (colorplus->cga.cgamode & 1) x = (colorplus->cga.crtc[1] << 3) + 16;
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else x = (colorplus->cga.crtc[1] << 4) + 16;
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colorplus->cga.lastline++;
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if (x != xsize || (colorplus->cga.lastline - colorplus->cga.firstline) != ysize)
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{
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xsize = x;
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ysize = colorplus->cga.lastline - colorplus->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 << 1) + 16);
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}
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video_blit_memtoscreen(0, colorplus->cga.firstline - 4, 0, (colorplus->cga.lastline - colorplus->cga.firstline) + 8, xsize, (colorplus->cga.lastline - colorplus->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 (colorplus->cga.cgamode & 1)
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{
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video_res_x /= 8;
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video_res_y /= colorplus->cga.crtc[9] + 1;
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video_bpp = 0;
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}
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else if (!(colorplus->cga.cgamode & 2))
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{
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video_res_x /= 16;
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video_res_y /= colorplus->cga.crtc[9] + 1;
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video_bpp = 0;
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}
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else if (!(colorplus->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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colorplus->cga.firstline = 1000;
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colorplus->cga.lastline = 0;
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colorplus->cga.cgablink++;
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colorplus->cga.oddeven ^= 1;
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}
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}
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else
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{
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colorplus->cga.sc++;
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colorplus->cga.sc &= 31;
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colorplus->cga.ma = colorplus->cga.maback;
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}
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if (colorplus->cga.cgadispon)
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colorplus->cga.cgastat &= ~1;
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if ((colorplus->cga.sc == (colorplus->cga.crtc[10] & 31) || ((colorplus->cga.crtc[8] & 3) == 3 && colorplus->cga.sc == ((colorplus->cga.crtc[10] & 31) >> 1))))
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colorplus->cga.con = 1;
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if (colorplus->cga.cgadispon && (colorplus->cga.cgamode & 1))
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{
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for (x = 0; x < (colorplus->cga.crtc[1] << 1); x++)
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colorplus->cga.charbuffer[x] = colorplus->cga.vram[(((colorplus->cga.ma << 1) + x) & 0x3fff)];
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}
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}
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}
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void *colorplus_init()
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{
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int display_type, contrast;
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colorplus_t *colorplus = malloc(sizeof(colorplus_t));
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memset(colorplus, 0, sizeof(colorplus_t));
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colorplus->cga.vram = malloc(0x8000);
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colorplus->cga.composite = colorplus->cga.snow_enabled = 0;
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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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timer_add(colorplus_poll, &colorplus->cga.vidtime, TIMER_ALWAYS_ENABLED, colorplus);
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mem_mapping_add(&colorplus->cga.mapping, 0xb8000, 0x08000, colorplus_read, NULL, NULL, colorplus_write, NULL, NULL, NULL, 0, colorplus);
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io_sethandler(0x03d0, 0x0010, colorplus_in, NULL, NULL, colorplus_out, NULL, NULL, colorplus);
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cgapal_rebuild(display_type, contrast);
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return colorplus;
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}
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void colorplus_close(void *p)
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{
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colorplus_t *colorplus = (colorplus_t *)p;
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free(colorplus->cga.vram);
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free(colorplus);
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}
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void colorplus_speed_changed(void *p)
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{
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colorplus_t *colorplus = (colorplus_t *)p;
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cga_recalctimings(&colorplus->cga);
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}
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device_config_t colorplus_config[] =
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{
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{
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.name = "display_type",
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.description = "Display type",
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.type = CONFIG_SELECTION,
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.selection =
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{
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{
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.description = "RGB",
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.value = DISPLAY_RGB
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},
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{
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.description = "RGB (no brown)",
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.value = DISPLAY_RGB_NO_BROWN
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},
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{
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.description = "Green Monochrome",
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.value = DISPLAY_GREEN
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},
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{
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.description = "Amber Monochrome",
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.value = DISPLAY_AMBER
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},
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{
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.description = "White Monochrome",
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.value = DISPLAY_WHITE
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},
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{
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.description = ""
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}
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},
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.default_int = DISPLAY_RGB
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},
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{
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.name = "contrast",
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.description = "Alternate monochrome contrast",
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.type = CONFIG_BINARY,
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.default_int = 0
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},
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{
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.type = -1
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}
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};
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device_t colorplus_device =
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{
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"Colorplus",
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0,
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colorplus_init,
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colorplus_close,
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NULL,
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colorplus_speed_changed,
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NULL,
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NULL,
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colorplus_config
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};
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