Subversion Repositories Shiroi

/* $Id: shiroi_video_mk_i.c 7 2024-08-28 14:02:52Z nishi $ */
#include "shiroi_video_mk_i.h"

#include "shiroi.h"

#include "tms9918util.h"

#include <stdlib.h>

void shiroi_video_mk_i_install(shiroi_t* shiroi, int slot) {
        shiroi->cards[slot].type = SHIROI_VIDEO_MARK_I;
        shiroi->cards[slot].videoptr = &shiroi->cards[slot].video;

        shiroi->cards[slot].video.width = TMS9918_PIXELS_X;
        shiroi->cards[slot].video.height = TMS9918_PIXELS_Y;
        shiroi->cards[slot].video.tick = 0;

        shiroi->cards[slot].video.vdp = vrEmuTms9918New();
        int x, y;
        for(y = 0; y < TMS9918_PIXELS_Y; y++) {
                for(x = 0; x < TMS9918_PIXELS_X; x++) {
                        shiroi->cards[slot].video.fb[y * TMS9918_PIXELS_X + x] = 0;
                }
        }
}

void shiroi_video_mk_i(shiroi_t* shiroi) {
        int i;

        uint16_t io = Z80_GET_ADDR(shiroi->z80_pins);
        uint16_t addr = io & 0xff;
        uint16_t data = (io >> 8) & 0xff;

        for(i = 0; i < 256 / SHIROI_IO_PORTS; i++) {
                if(shiroi->cards[i].type == SHIROI_VIDEO_MARK_I) {
                        if(shiroi->z80_pins & Z80_RD) {
                                /* I/O Read */
                                if(addr == 1) {
                                        Z80_SET_DATA(shiroi->z80_pins, vrEmuTms9918ReadData(shiroi->cards[i].video.vdp));
                                } else if(addr == 2) {
                                        Z80_SET_DATA(shiroi->z80_pins, shiroi->cards[i].type);
                                }
                        } else if(shiroi->z80_pins & Z80_WR) {
                                /* I/O Write */
                                if(addr == 0) {
                                        vrEmuTms9918WriteAddr(shiroi->cards[i].video.vdp, data);
                                } else if(addr == 1) {
                                        vrEmuTms9918WriteData(shiroi->cards[i].video.vdp, data);
                                }
                        }
                }
        }
}

void shiroi_video_mk_i_tick(shiroi_t* shiroi) {
        uint8_t scanline[TMS9918_PIXELS_X];
        int i, y, x;
        for(i = 0; i < 256 / SHIROI_IO_PORTS; i++) {
                if(shiroi->cards[i].type == SHIROI_VIDEO_MARK_I) {
                        shiroi->cards[i].video.tick++;
                        if(shiroi->cards[i].video.tick == 256) {
                                shiroi->cards[i].video.tick = 0;
                                for(y = 0; y < TMS9918_PIXELS_Y; y++) {
                                        vrEmuTms9918ScanLine(shiroi->cards[i].video.vdp, y, scanline);
                                        for(x = 0; x < TMS9918_PIXELS_X; x++) {
                                                shiroi->cards[i].video.fb[y * TMS9918_PIXELS_X + x] = vrEmuTms9918Palette[scanline[x]];
                                        }
                                }
                        }
                }
        }
}