user/ports: make doom playable

1 files changed, 75 insertions, 4 deletions

diff --git a/ports/doom b/ports/doom
index c230087..774e6f6 100644
--- a/ports/doom
+++ b/ports/doom
@@ -14,22 +14,57 @@ fetch() {
 	curl -A "Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/81.0" -LO https://assets.wad-archive.com/wadarchive/files/1437fc1ac25a17d5b3cef4c9d2f74e40cae3d231/DOOM1.WAD
 
 	cat <<\EOF > doomgeneric_camellia.c
-#include <string.h>
 #include <camellia/syscalls.h>
+#include <shared/container/ring.h>
+#include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <user/lib/draw/draw.h>
+#include <user/lib/thread.h>
 
 #include "doomgeneric.h"
+#include "doomkeys.h"
+
+static struct framebuf fb;
+static handle_t kb;
 
-struct framebuf fb;
+static const char keymap_lower[] = {
+	'\0', '\0', '1',  '2',  '3',  '4',  '5',  '6',  '7',  '8',  '9',  '0',  '-',  '=',  '\b', '\t',
+	'q',  'w',  'e',  'r',  't',  'y',  'u',  'i',  'o',  'p',  '[',  ']',  '\r', '\0', 'a',  's',
+	'd',  'f',  'g',  'h',  'j',  'k',  'l',  '\0', '\'', '`',  '\0', '\\', 'z',  'x',  'c',  'v',
+	'b',  'n',  'm',  ',',  '.',  '/',  '\0', '*',  '\0', ' ',  '\0', '\0', '\0', '\0', '\0', '\0',
+	'\0', '\0', '\0', '\0', '\0', '\0', '\0', '7',  '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1',
+	'2',  '3',  '0',  '.',  '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
+	'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
+	'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
+};
+
+static char kb_backbuf[256];
+static ring_t kb_backlog = {kb_backbuf, sizeof kb_backbuf, 0, 0};
+
+static void kb_thread(void *arg) {
+	(void)arg;
+	char buf[sizeof kb_backbuf];
+	for (;;) {
+		int ret = _syscall_read(kb, buf, sizeof buf, 0);
+		if (ret <= 0) break;
+		ring_put(&kb_backlog, buf, ret);
+	}
+}
 
 void DG_Init(void) {
 	if (fb_setup(&fb, "/kdev/video/") < 0) {
 		puts("DG_Init: fb_setup error");
 		abort();
 	}
+	kb = _syscall_open("/kdev/ps2/kb", 12, 0);
+	if (kb < 0) {
+		puts("DG_Init: can't open keyboard");
+		abort();
+	}
+	thread_create(0, kb_thread, NULL);
 }
 
 void DG_DrawFrame(void) {
@@ -57,8 +92,44 @@ uint32_t DG_GetTicksMs(void) {
 	return timer;
 }
 
-int DG_GetKey(int *pressed, unsigned char *doomKey) {
-	return 0;
+int DG_GetKey(int *pressed, unsigned char *key) {
+	uint8_t c;
+	int read = ring_get(&kb_backlog, (char*)&c, 1);
+	bool extended = c == 0xe0;;
+	if (read == 0) return 0;
+	if (extended) ring_get(&kb_backlog, (char*)&c, 1);
+	bool down = !(c & 0x80);
+
+	c &= 0x7f;
+	if (!extended) {
+		switch (c) {
+			case 0x01:
+				c = KEY_ESCAPE;
+				break;
+			case 0x2a: case 0x36:
+				c = KEY_RSHIFT;
+				break;
+			case 0x1d:
+				c = KEY_FIRE;
+				break;
+			default:
+				c = keymap_lower[c & 0x7f];
+				switch (c) {
+					case ' ': c = KEY_USE; break;
+				}
+		}
+	} else {
+		switch (c) {
+			case 0x48: c = KEY_UPARROW; break;
+			case 0x50: c = KEY_DOWNARROW; break;
+			case 0x4B: c = KEY_LEFTARROW; break;
+			case 0x4D: c = KEY_RIGHTARROW; break;
+			default:   c = '\0'; break;
+		}
+	}
+	*pressed = down;
+	*key = c;
+	return 1;
 }
 
 void DG_SetWindowTitle(const char *title) {