From c3b0fa04a663fe233765b83d3be41a42aa08c25d Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Mon, 3 May 2021 08:21:10 +0100
Subject: Initial import for public release

---
 int.h | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 int.h

(limited to 'int.h')

diff --git a/int.h b/int.h
new file mode 100644
index 0000000..3932071
--- /dev/null
+++ b/int.h
@@ -0,0 +1,100 @@
+/*
+   The Return of Traxtor (Amstrad CPC)
+   Copyright (C) 2015 Juan J. Martinez <jjm@usebox.net>
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#ifndef _INT_H
+#define _INT_H
+
+#ifndef WFRAMES
+#define WFRAMES		4
+#endif
+
+// timer
+unsigned char tick;
+unsigned char timer;
+unsigned char playerISR;
+
+void
+wait()
+{
+    while ((unsigned char)(tick - timer) < WFRAMES)
+        __asm__("halt");
+    timer = tick;
+}
+
+void
+WyzPlayerOn()
+{
+    __asm;
+    di
+    ld a, #1
+    ld (_playerISR), a
+    ei
+    __endasm;
+}
+
+void
+WyzPlayerOff()
+{
+    __asm;
+    di
+    xor a
+    ld (_playerISR), a
+    call _cpc_WyzSetPlayerOff
+    ei
+    __endasm;
+
+}
+
+void
+setup_int()
+{
+    tick = 0;
+    timer = 0;
+    playerISR = 0;
+    __asm;
+    di
+
+    ld ix, #0x0038
+    ld hl, #isr
+    ld (ix), #0xc3
+    ld 1(ix), l
+    ld 2(ix), h
+    im 1
+
+    ei
+    jp setup_done
+
+    isr:
+    push af
+    ld a, (#_tick)
+    inc a
+    ld (#_tick), a
+    ld a, (#_playerISR)
+    or a
+    jp z, player_is_off
+
+    jp _cpc_WyzPlayerISR
+    player_is_off:
+    pop af
+    ei
+    ret
+
+    setup_done:
+    __endasm;
+}
+
+#endif // _INT_H
-- 
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