fix: fix POINT screen offset

src/arch/zx48k/library/point.bas

@@ -24,7 +24,7 @@ REM Avoid recursive / multiple inclusion
 ' Returns:
 '     1 if point is plot 0 otherwise (byte)
 ' ----------------------------------------------------------------
-function point(x as ubyte, y as ubyte) as byte
+function fastcall point(x as ubyte, y as ubyte) as byte
 	asm
 
 	PROC
@@ -35,8 +35,22 @@ function point(x as ubyte, y as ubyte) as byte
 
 PIXEL_ADDR EQU (22AAh + 6)	; ROM addrs which calculate screen addr
 
-	ld b, (ix+7)
-	ld c, (ix+5)
+    pop hl
+    ex (sp), hl  ; callee => put RET address back. H = y
+	ld b, h
+	ld c, a
+
+#ifdef SCREEN_Y_OFFSET
+    ld a, SCREEN_Y_OFFSET
+    add a, b
+    ld b, a
+#endif
+
+#ifdef SCREEN_X_OFFSET
+    ld a, SCREEN_X_OFFSET
+    add a, c
+    ld c, a
+#endif
 
 	ld a, 191 ; Max y value
 	sub b	

src/arch/zx48k/library/sinclair.bas

@@ -16,11 +16,17 @@ REM Avoid recursive / multiple inclusion
 
 REM This library includes other classic Sinclair ZX Spectrum Routines
 
+REM Shift the screen 16 pixels UP to match that of the original BASIC
+REM ... unless the user has specified otherwise
+
+#ifndef SCREEN_Y_OFFSET
+#  define SCREEN_Y_OFFSET 16
+#endif
+
 #include once <attr.bas>
 #include once <point.bas>
 #include once <screen.bas>
 
-
 REM This is not the original Sinclair INPUT, but better than nothing
 #include once <input.bas>
 
@@ -30,11 +36,4 @@ REM This needed to initialize USR "a" to a memory heap space
 REM Now updates UDG system var to new UDG memory zone
 POKE Uinteger 23675, allocate(21 * 8) : REM 8 bytes per UDG (21 total)
 
-REM Shift the screen 16 pixels UP to match that of the original BASIC
-REM ... unless the user has specified otherwise
-#ifndef SCREEN_Y_OFFSET
-#  define SCREEN_Y_OFFSET 16
 #endif
-
-#endif
-

src/arch/zxnext/library/point.bas

@@ -24,7 +24,7 @@ REM Avoid recursive / multiple inclusion
 ' Returns:
 '     1 if point is plot 0 otherwise (byte)
 ' ----------------------------------------------------------------
-function point(x as ubyte, y as ubyte) as byte
+function fastcall point(x as ubyte, y as ubyte) as byte
 	asm
 
 	PROC
@@ -35,8 +35,22 @@ function point(x as ubyte, y as ubyte) as byte
 
 PIXEL_ADDR EQU (22AAh + 6)	; ROM addrs which calculate screen addr
 
-	ld b, (ix+7)
-	ld c, (ix+5)
+    pop hl
+    ex (sp), hl  ; callee => put RET address back. H = y
+	ld b, h
+	ld c, a
+
+#ifdef SCREEN_Y_OFFSET
+    ld a, SCREEN_Y_OFFSET
+    add a, b
+    ld b, a
+#endif
+
+#ifdef SCREEN_X_OFFSET
+    ld a, SCREEN_X_OFFSET
+    add a, c
+    ld c, a
+#endif
 
 	ld a, 191 ; Max y value
 	sub b	

src/arch/zxnext/library/sinclair.bas

@@ -16,11 +16,17 @@ REM Avoid recursive / multiple inclusion
 
 REM This library includes other classic Sinclair ZX Spectrum Routines
 
+REM Shift the screen 16 pixels UP to match that of the original BASIC
+REM ... unless the user has specified otherwise
+
+#ifndef SCREEN_Y_OFFSET
+#  define SCREEN_Y_OFFSET 16
+#endif
+
 #include once <attr.bas>
 #include once <point.bas>
 #include once <screen.bas>
 
-
 REM This is not the original Sinclair INPUT, but better than nothing
 #include once <input.bas>
 
@@ -30,11 +36,4 @@ REM This needed to initialize USR "a" to a memory heap space
 REM Now updates UDG system var to new UDG memory zone
 POKE Uinteger 23675, allocate(21 * 8) : REM 8 bytes per UDG (21 total)
 
-REM Shift the screen 16 pixels UP to match that of the original BASIC
-REM ... unless the user has specified otherwise
-#ifndef SCREEN_Y_OFFSET
-#  define SCREEN_Y_OFFSET 16
 #endif
-
-#endif
-

tests/runtime/cases/point.bas

@@ -0,0 +1,14 @@
+#include "lib/tst_framework.bas"
+
+INIT("Testing SCREEN X,Y coords shift")
+
+#define SCREEN_Y_OFFSET 96
+#define SCREEN_X_OFFSET 127
+
+#include <point.bas>
+
+PLOT 0, 0
+PLOT -20, 20
+PRINT POINT(0, 0); " "; POINT(-20, 20); " "; POINT(20, -20); " "; POINT(-20, -20)
+
+FINISH

tests/runtime/run

@@ -1,9 +1,8 @@
-#!/bin/bash
+
 # vim:et:ts=4:
 
 RUN=$(basename -s .bas $1)
 rm -f "$RUN.tzx"
 killall fuse 2>/dev/null
 ../../zxbc.py -TaB $1 --debug-memory || exit 1
-fuse --auto-load --speed=19000 "$RUN.tzx" &
-
+fuse --auto-load --speed=19000 --machine=plus2 "$RUN.tzx" &