Initial data commit

Task/Call-a-foreign-language-function/Modula-2/call-a-foreign-language-function-1.mod2

@@ -0,0 +1,68 @@
+#include <vga.h>
+
+int   Initialize (void)
+{
+   if ( vga_init () == 0 )
+     return 1;
+   else
+     return 0;
+}
+
+void  SetMode (int newmode)
+{
+   vga_setmode (newmode);
+}
+
+int   GetMode (void)
+{
+   return vga_getcurrentmode ();
+}
+
+int   MaxWidth (void)
+{
+   return vga_getxdim ();
+}
+
+int   MaxHeight (void)
+{
+   return vga_getydim ();
+}
+
+void  Clear (void)
+{
+   vga_clear ();
+}
+void  SetColour (int colour)
+{
+   vga_setcolor (colour);
+}
+
+void  SetEGAcolour (int colour)
+{
+   vga_setegacolor (colour);
+}
+
+void  SetRGB (int red, int green, int blue)
+{
+   vga_setrgbcolor (red, green, blue);
+}
+
+void   DrawLine (int x0, int y0, int dx, int dy)
+{
+   vga_drawline (x0, y0, x0 + dx, y0 + dy);
+}
+
+void   Plot (int x, int y)
+{
+   vga_drawpixel (x, y);
+}
+
+int    ThisColour (int x, int y)
+{
+   return vga_getpixel (x, y);
+}
+
+void   GetKey (char *ch)
+{
+   *ch = vga_getkey ();
+}

Task/Call-a-foreign-language-function/Modula-2/call-a-foreign-language-function-2.mod2

@@ -0,0 +1,32 @@
+FOREIGN MODULE Vga;
+
+TYPE    EGAcolour  = (black, blue, green, cyan, red,    pink,  brown, white,
+                       GREY, BLUE, GREEN, CYAN, RED, MAGENTA, YELLOW, WHITE);
+
+PROCEDURE Initialize () : BOOLEAN;
+
+PROCEDURE MaxWidth () : CARDINAL;
+
+PROCEDURE MaxHeight () : CARDINAL;
+
+PROCEDURE Clear;
+
+PROCEDURE SetColour (colour : CARDINAL);
+
+PROCEDURE SetEGAcolour (colour : CARDINAL);
+
+PROCEDURE SetRGB (red, green, blue : CARDINAL);
+
+PROCEDURE DrawLine (x0, y0, dx, dy : CARDINAL);
+
+PROCEDURE Plot (x, y : CARDINAL);
+
+PROCEDURE ThisColour (x, y : CARDINAL) : CARDINAL;
+
+PROCEDURE SetMode (newmode : CARDINAL);
+
+PROCEDURE GetMode () : CARDINAL;
+
+PROCEDURE GetKey (VAR ch : CHAR);
+
+END Vga.

Task/Call-a-foreign-language-function/Modula-2/call-a-foreign-language-function-3.mod2

@@ -0,0 +1,33 @@
+MODULE svg01;
+
+FROM  InOut      IMPORT  Read, Write, WriteBf, WriteString;
+
+IMPORT Vga;
+
+VAR   OldMode, x, y             : CARDINAL;
+      ch                        : CHAR;
+
+BEGIN
+   IF  Vga.Initialize () = FALSE  THEN
+      WriteString ('Could not start SVGAlib libraries. Aborting...');
+      WriteBf;
+      HALT
+   END;
+   OldMode := Vga.GetMode ();
+   Vga.SetMode (4);
+   Vga.SetColour (14);
+   Vga.Clear ();
+   Vga.SetColour (10);
+   FOR y := 125 TO 175 DO
+      FOR x := 100 TO 500 DO
+         Vga.Plot (x, y)
+      END
+   END;
+   LOOP
+      Read (ch);
+      IF  ch = 'X'  THEN  EXIT  END
+   END;
+   Vga.SetMode (OldMode);
+   Write (ch);
+   WriteBf;
+END svg01.