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https://github.com/hsoft/collapseos.git
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emul/hw/sms: WIP
VDP kinda works. Can see the Collapse OS prompt with SMS base recipe if `STDIO_GETC` gets replaced with infinite loop (no input emul yet).
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1
emul/hw/sms/.gitignore
vendored
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1
emul/hw/sms/.gitignore
vendored
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/sms
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15
emul/hw/sms/Makefile
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15
emul/hw/sms/Makefile
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EXTOBJS = ../../emul.o ../../libz80/libz80.o
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OBJS = sms.o vdp.o
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TARGET = sms
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CFLAGS += `pkg-config --cflags xcb`
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.PHONY: all
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all: $(TARGET)
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$(TARGET): $(OBJS) $(EXTOBJS)
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$(CC) `pkg-config --libs xcb` $(OBJS) $(EXTOBJS) -o $@
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.PHONY: clean
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clean:
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rm -f $(TARGET) $(OBJS)
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194
emul/hw/sms/sms.c
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194
emul/hw/sms/sms.c
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <xcb/xcb.h>
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#include "../../emul.h"
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#include "vdp.h"
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#define RAMSTART 0xc000
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#define VDP_CMD_PORT 0xbf
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#define VDP_DATA_PORT 0xbe
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#define MAX_ROMSIZE 0x8000
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static xcb_connection_t *conn;
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static xcb_screen_t *screen;
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/* graphics contexts */
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static xcb_gcontext_t fg;
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/* win */
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static xcb_drawable_t win;
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// pixels to draw. We draw them in one shot.
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static xcb_rectangle_t rectangles[VDP_SCREENW*VDP_SCREENH];
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static Machine *m;
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static VDP vdp;
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static bool vdp_changed;
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static uint8_t iord_vdp_cmd()
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{
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return vdp_cmd_rd(&vdp);
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}
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static uint8_t iord_vdp_data()
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{
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return vdp_data_rd(&vdp);
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}
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static void iowr_vdp_cmd(uint8_t val)
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{
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vdp_cmd_wr(&vdp, val);
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}
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static void iowr_vdp_data(uint8_t val)
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{
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vdp_changed = true;
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vdp_data_wr(&vdp, val);
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}
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void create_window()
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{
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uint32_t mask;
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uint32_t values[2];
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/* Create the window */
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win = xcb_generate_id(conn);
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mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
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values[0] = screen->white_pixel;
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values[1] = XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS |
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XCB_EVENT_MASK_KEY_RELEASE;
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xcb_create_window(
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conn,
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screen->root_depth,
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win,
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screen->root,
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0, 0,
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150, 150,
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10,
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XCB_WINDOW_CLASS_INPUT_OUTPUT,
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screen->root_visual,
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mask, values);
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fg = xcb_generate_id(conn);
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mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
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values[0] = screen->black_pixel;
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values[1] = 0;
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xcb_create_gc(conn, fg, screen->root, mask, values);
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/* Map the window on the screen */
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xcb_map_window(conn, win);
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}
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void draw_pixels()
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{
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xcb_get_geometry_reply_t *geom;
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geom = xcb_get_geometry_reply(conn, xcb_get_geometry(conn, win), NULL);
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xcb_clear_area(
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conn, 0, win, 0, 0, geom->width, geom->height);
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// Figure out inner size to maximize our screen's aspect ratio
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int psize = geom->height / VDP_SCREENH;
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if (geom->width / VDP_SCREENW < psize) {
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// width is the constraint
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psize = geom->width / VDP_SCREENW;
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}
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int innerw = psize * VDP_SCREENW;
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int innerh = psize * VDP_SCREENH;
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int innerx = (geom->width - innerw) / 2;
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int innery = (geom->height - innerh) / 2;
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int drawcnt = 0;
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for (int i=0; i<VDP_SCREENW; i++) {
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for (int j=0; j<VDP_SCREENH; j++) {
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if (vdp_pixel(&vdp, i, j)) {
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int x = innerx + (i*psize);
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int y = innery + (j*psize);
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rectangles[drawcnt].x = x;
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rectangles[drawcnt].y = y;
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rectangles[drawcnt].height = psize;
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rectangles[drawcnt].width = psize;
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drawcnt++;
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}
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}
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}
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if (drawcnt) {
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xcb_poly_fill_rectangle(
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conn, win, fg, drawcnt, rectangles);
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}
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vdp_changed = false;
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xcb_flush(conn);
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}
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void event_loop()
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{
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while (1) {
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emul_step();
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if (vdp_changed) {
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// To avoid overdrawing, we'll let the CPU run a bit to finish its
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// drawing operation.
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emul_steps(100);
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draw_pixels();
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}
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xcb_generic_event_t *e = xcb_poll_for_event(conn);
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if (!e) {
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continue;
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}
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switch (e->response_type & ~0x80) {
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/* ESC to exit */
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case XCB_KEY_RELEASE:
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case XCB_KEY_PRESS: {
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xcb_key_press_event_t *ev = (xcb_key_press_event_t *)e;
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if (ev->detail == 0x09) return;
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break;
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}
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case XCB_EXPOSE: {
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draw_pixels();
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break;
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}
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default: {
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break;
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}
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}
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free(e);
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}
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}
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int main(int argc, char *argv[])
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{
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if (argc != 2) {
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fprintf(stderr, "Usage: ./sms /path/to/rom\n");
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return 1;
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}
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FILE *fp = fopen(argv[1], "r");
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if (fp == NULL) {
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fprintf(stderr, "Can't open %s\n", argv[1]);
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return 1;
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}
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m = emul_init();
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m->ramstart = RAMSTART;
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int i = 0;
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int c;
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while ((c = fgetc(fp)) != EOF && i < MAX_ROMSIZE) {
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m->mem[i++] = c & 0xff;
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}
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pclose(fp);
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if (c != EOF) {
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fprintf(stderr, "ROM image too large.\n");
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return 1;
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}
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vdp_init(&vdp);
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vdp_changed = false;
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m->iord[VDP_CMD_PORT] = iord_vdp_cmd;
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m->iord[VDP_DATA_PORT] = iord_vdp_data;
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m->iowr[VDP_CMD_PORT] = iowr_vdp_cmd;
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m->iowr[VDP_DATA_PORT] = iowr_vdp_data;
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conn = xcb_connect(NULL, NULL);
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screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
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create_window();
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draw_pixels();
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event_loop();
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emul_printdebug();
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return 0;
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}
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77
emul/hw/sms/vdp.c
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77
emul/hw/sms/vdp.c
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#include <string.h>
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#include "vdp.h"
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void vdp_init(VDP *vdp)
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{
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memset(vdp->vram, 0, VDP_VRAM_SIZE);
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memset(vdp->regs, 0, 0x10);
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vdp->has_cmdlsb = false;
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vdp->curaddr = 0;
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}
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uint8_t vdp_cmd_rd(VDP *vdp)
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{
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return 0;
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}
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void vdp_cmd_wr(VDP *vdp, uint8_t val)
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{
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if (!vdp->has_cmdlsb) {
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vdp->cmdlsb = val;
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vdp->has_cmdlsb = true;
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return;
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}
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vdp->has_cmdlsb = false;
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if ((val & 0xc0) == 0x80) {
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// set register
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vdp->regs[val&0xf] = vdp->cmdlsb;
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} else if ((val & 0xc0) == 0xc0) {
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// palette RAM
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vdp->curaddr = 0x4000 + (vdp->cmdlsb&0x1f);
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} else {
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// VRAM
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vdp->curaddr = ((val&0x3f) << 8) + vdp->cmdlsb;
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}
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}
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uint8_t vdp_data_rd(VDP *vdp)
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{
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uint8_t res = vdp->vram[vdp->curaddr];
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if (vdp->curaddr < VDP_VRAM_SIZE) {
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vdp->curaddr++;
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}
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return res;
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}
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void vdp_data_wr(VDP *vdp, uint8_t val)
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{
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vdp->vram[vdp->curaddr] = val;
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if (vdp->curaddr < VDP_VRAM_SIZE) {
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vdp->curaddr++;
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}
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}
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uint8_t vdp_pixel(VDP *vdp, uint16_t x, uint16_t y)
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{
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if (x >= VDP_SCREENW) {
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return 0;
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}
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if (y >= VDP_SCREENH) {
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return 0;
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}
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// name table offset
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uint16_t offset = 0x3800 + ((y/8) << 6) + ((x/8) << 1);
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uint16_t tableval = vdp->vram[offset] + (vdp->vram[offset+1] << 8);
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uint16_t tilenum = tableval & 0x1ff;
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// tile offset this time. Each tile is 0x20 bytes long.
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offset = tilenum * 0x20;
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// Each 4 byte is a row. Find row first.
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offset += ((y%8) * 4);
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uint8_t bitnum = 7 - (x%8);
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// Now, let's compose the result by pushing the right bit of our 4 bytes
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// into our result.
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return ((vdp->vram[offset] >> bitnum) & 1) + \
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(((vdp->vram[offset+1] >> bitnum) & 1) << 1) + \
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(((vdp->vram[offset+2] >> bitnum) & 1) << 2) + \
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(((vdp->vram[offset+3] >> bitnum) & 1) << 3);
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}
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26
emul/hw/sms/vdp.h
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26
emul/hw/sms/vdp.h
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#include <stdint.h>
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#include <stdbool.h>
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#define VDP_VRAM_SIZE 0x4020
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#define VDP_SCREENW (32*8)
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#define VDP_SCREENH (24*8)
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// Offset of the name table
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#define VDP_NTABLE_OFFSET 0x3800
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typedef struct {
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// the last 0x20 is palette RAM
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uint8_t vram[VDP_VRAM_SIZE];
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uint8_t regs[0x10];
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uint8_t cmdlsb;
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bool has_cmdlsb;
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uint16_t curaddr;
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} VDP;
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void vdp_init(VDP *vdp);
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uint8_t vdp_cmd_rd(VDP *vdp);
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void vdp_cmd_wr(VDP *vdp, uint8_t val);
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uint8_t vdp_data_rd(VDP *vdp);
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void vdp_data_wr(VDP *vdp, uint8_t val);
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// result is a RGB value
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uint8_t vdp_pixel(VDP *vdp, uint16_t x, uint16_t y);
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