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nishi |
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/* $Id: shiroi_video_mk_ii.c 7 2024-08-28 14:02:52Z nishi $ */
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#include "shiroi_video_mk_ii.h"
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#include "shiroi.h"
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#include <stdlib.h>
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uint64_t shiroi_video_mk_ii_cb(uint64_t pins, void* data) {
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shiroi_card_t* card = (shiroi_card_t*)data;
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MC6847_SET_DATA(pins, card->video.vram[MC6847_GET_ADDR(pins)]);
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return pins;
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}
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void shiroi_video_mk_ii_install(shiroi_t* shiroi, int slot) {
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shiroi->cards[slot].type = SHIROI_VIDEO_MARK_II;
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shiroi->cards[slot].videoptr = &shiroi->cards[slot].video;
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shiroi->cards[slot].video.width = MC6847_IMAGE_WIDTH + MC6847_BORDER_PIXELS * 2;
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shiroi->cards[slot].video.height = MC6847_FRAMEBUFFER_HEIGHT;
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shiroi->cards[slot].video.tick = 0;
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mc6847_desc_t desc;
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desc.tick_hz = 3 * 1024 * 1024;
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desc.framebuffer.ptr = malloc(MC6847_FRAMEBUFFER_SIZE_BYTES);
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desc.framebuffer.size = MC6847_FRAMEBUFFER_SIZE_BYTES;
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desc.fetch_cb = shiroi_video_mk_ii_cb;
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desc.user_data = &shiroi->cards[slot];
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mc6847_init(&shiroi->cards[slot].video.mc6847, &desc);
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shiroi->cards[slot].video.mc6847.pins |= MC6847_INV;
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int x, y;
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for(y = 0; y < shiroi->cards[slot].video.height; y++) {
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for(x = 0; x < shiroi->cards[slot].video.width; x++) {
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shiroi->cards[slot].video.fb[y * shiroi->cards[slot].video.width + x] = 0;
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}
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}
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}
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void shiroi_video_mk_ii(shiroi_t* shiroi) {
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int i;
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uint16_t io = Z80_GET_ADDR(shiroi->z80_pins);
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uint16_t addr = io & 0xff;
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uint16_t data = (io >> 8) & 0xff;
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for(i = 0; i < 256 / SHIROI_IO_PORTS; i++) {
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if(shiroi->cards[i].type == SHIROI_VIDEO_MARK_II) {
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if(shiroi->z80_pins & Z80_RD) {
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/* I/O Read */
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if(addr == 1) {
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Z80_SET_DATA(shiroi->z80_pins, shiroi->cards[i].video.vram[shiroi->cards[i].video.vram_addr++]);
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} else if(addr == 2) {
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Z80_SET_DATA(shiroi->z80_pins, shiroi->cards[i].type);
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}
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} else if(shiroi->z80_pins & Z80_WR) {
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/* I/O Write */
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if(addr == 0) {
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shiroi->cards[i].video.vram_addr >>= 8;
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shiroi->cards[i].video.vram_addr |= data << 8;
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} else if(addr == 1) {
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shiroi->cards[i].video.vram[shiroi->cards[i].video.vram_addr++] = data;
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}
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}
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}
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}
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}
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void shiroi_video_mk_ii_tick(shiroi_t* shiroi) {
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int i, y, x;
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for(i = 0; i < 256 / SHIROI_IO_PORTS; i++) {
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if(shiroi->cards[i].type == SHIROI_VIDEO_MARK_II) {
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shiroi->cards[i].video.tick++;
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mc6847_tick(&shiroi->cards[i].video.mc6847, shiroi->cards[i].video.mc6847.pins);
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if(shiroi->cards[i].video.tick == 16384) {
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shiroi->cards[i].video.tick = 0;
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for(y = 0; y < MC6847_FRAMEBUFFER_HEIGHT; y++) {
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for(x = 0; x < MC6847_FRAMEBUFFER_WIDTH; x++) {
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if(x < shiroi->cards[i].video.width) {
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uint32_t c = shiroi->cards[i].video.mc6847.hwcolors[shiroi->cards[i].video.mc6847.fb[y * MC6847_FRAMEBUFFER_WIDTH + x] & 0xf];
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shiroi->cards[i].video.fb[y * shiroi->cards[i].video.width + x] = ((c & 0xffffff) << 8) | ((c & 0xff000000) >> 24);
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}
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}
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}
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}
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}
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}
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}
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