-- ----------------------------------------------------------------- --
-- --
-- This 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 2 of the License, or (at your option) any later version. --
-- --
-- This software 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 library; if not, write to the --
-- Free Software Foundation, Inc., 59 Temple Place - Suite 330, --
-- Boston, MA 02111-1307, USA. --
-- --
-- ----------------------------------------------------------------- --
-- ----------------------------------------------------------------- --
-- This is a translation, to the Ada programming language, of the --
-- original C test files written by Sam Lantinga - www.libsdl.org --
-- translation made by Antonio F. Vargas - www.adapower.net/~avargas --
-- ----------------------------------------------------------------- --
-- ----------------------------------------------------------------- --
-- WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
-- ----------------------------------------------------------------- --
-- SERIOUS WARNING: The Ada code in this files may, at some points,
-- rely directly on pointer arithmetic which is considered very
-- unsafe and PRONE TO ERROR. The AdaSDL_Framebuffer examples are
-- more appropriate and easier to understand. They should be used in
-- replacement of this files. Please go there.
-- This file exists only for the sake of completness and to test
-- AdaSDL without the dependency of AdaSDL_Framebuffer.
-- ----------------------------------------------------------------- --
-- WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
-- ----------------------------------------------------------------- --
with Lib_C;
with Interfaces.C.Strings;
with Interfaces.C.Pointers;
with Ada.Numerics.Discrete_Random;
with Ada.Calendar;
with Ada.Command_Line;
with Ada.Text_IO; use Ada.Text_IO;
with GNAT.OS_Lib;
with SDL.Video;
with SDL.Types; use SDL.Types;
with SDL.Events;
with SDL.Error;
with SDL.Keysym;
with SDL.Mouse;
procedure graywin is
package C renames Interfaces.C;
use type C.int;
package CS renames Interfaces.C.Strings;
package CL renames Ada.Command_Line;
package V renames SDL.Video;
use type V.Surface_Flags;
use type V.Surface_ptr;
package Ev renames SDL.Events;
package Er renames SDL.Error;
package Ks renames SDL.Keysym;
use type Ks.Key;
package M renames SDL.Mouse;
Screen_Width : constant := 640;
Screen_Height : constant := 480;
-- ===============================================
seeded : Boolean := False;
-- Draw a randomly sized and colored box centered about (X,Y)
procedure DrawBox (screen : V.Surface_ptr;
X : C.int;
Y : C.int)
is
area : V.Rect;
color : Uint32;
type Screen_Width_Type is range 0 .. Screen_Width - 1;
package Random_w is new Ada.Numerics.Discrete_Random (
Screen_Width_Type);
Width_Generator : Random_w.Generator;
use Random_w;
type Screen_Height_Type is range 0 .. Screen_Height - 1;
package Random_h is new Ada.Numerics.Discrete_Random (
Screen_Height_Type);
Height_Generator : Random_h.Generator;
use Random_h;
type Color_Range is range 0 .. 255;
package Random_Color is new Ada.Numerics.Discrete_Random (
Color_Range);
Color_Generator : Random_Color.Generator;
use Random_Color;
use Ada.Calendar;
begin
-- See the random number generator
-- if not seeded then
Reset (Width_Generator);
Reset (Height_Generator);
Reset (Color_Generator);
-- seeded := True;
-- end if;
-- Get the bounds of the rectangle
area.w := Uint16 (Random (Width_Generator));
area.h := Uint16 (Random (Height_Generator));
area.x := Sint16 (Uint16 (X) - (area.w / 2));
area.y := Sint16 (Uint16 (Y) - (area.h / 2));
color := Uint32 (Random (Color_Generator));
Put_Line ("Color: " & Uint32'Image (color) & "; " &
"x: " & Sint16'Image (area.x) & "; " &
"y: " & Sint16'Image (area.y) & "; " &
"w: " & Uint16'Image (area.w) & "; " &
"h: " & Uint16'Image (area.h) & "; ");
-- Do is!
-- Read the note in the "area" declaration point.
V.FillRect (screen, area, color);
V.Update_Rect (screen, area);
end DrawBox;
-- ===============================================
function CreateScreen (w, h: Uint16; bpp : Uint8; flags : V.Surface_Flags)
return V.Surface_ptr
is
screen : V.Surface_ptr;
use type C.size_t;
palette : V.Colors_Array (0 .. 255);
use SDL.Types.Uint8_Ptrs;
use SDL.Types.Uint8_PtrOps;
buffer : Uint8_Ptrs.Object_Pointer;
begin
-- Set video mode
screen := V.SetVideoMode (C.int (w), C.int (h),
C.int (bpp), V.Surface_Flags (flags));
if screen = null then
Put_Line ("Couldn't set display mode: " & Er.Get_Error);
return null;
end if;
Put ("Screen is in ");
if (screen.flags and V.FULLSCREEN) /= 0 then
Put_Line ("fullscreen");
else
Put_Line ("windowed");
end if;
-- Set a gray colormap, reverse order from white to black
for i in palette'Range loop
palette (i) := (255 - Uint8 (i),
255 - Uint8 (i),
255 - Uint8 (i), 0);
end loop;
V.SetColors (screen, palette, C.int (palette'First), palette'Length);
-- Set the surface pixels and refresh!
if V.LockSurface (screen) < 0 then
Put_Line ("Couldn't lock display surface: " & Er.Get_Error);
return null;
end if;
buffer := Uint8_Ptrs.To_Pointer (screen.pixels);
for i in 0 .. screen.h - 1 loop
-- Uint8_PtrOps.Value (
-- Pointer (buffer), C.ptrdiff_t (screen.w)).all :=
-- (others => i * 255 / screen.h);
buffer := To_Pointer (
Lib_C.memset (To_Address (buffer),
(i * 255) / screen.h,
C.size_t (screen.w)));
buffer := Object_Pointer (
Pointer (buffer) + C.ptrdiff_t (screen.pitch));
end loop;
V.UnlockSurface (screen);
V.UpdateRect (screen, 0, 0, 0, 0);
return screen;
end CreateScreen;
-- ===============================================
screen : V.Surface_ptr;
videoflags : V.Surface_Flags;
done : Boolean;
event : Ev.Event;
argc : Integer := CL.Argument_Count;
Wait_Event_Result : C.int;
begin
-- Initialize SDL
if SDL.Init (SDL.INIT_VIDEO) < 0 then
Put_Line ("Couldn't initialize SDL: " & Er.Get_Error);
GNAT.OS_Lib.OS_Exit (1);
end if;
-- See if we try to get a hardware colormap */
videoflags := V.SWSURFACE;
while argc > 0 loop
if CL.Argument (argc) = "-hw" then
videoflags := videoflags or V.HWSURFACE;
argc := argc - 1;
elsif CL.Argument (argc) = "-warp" then
videoflags := videoflags or V.HWPALETTE;
argc := argc -1;
elsif CL.Argument (argc) = "-fullscreen" then
videoflags := videoflags or V.FULLSCREEN;
argc := argc - 1;
else
Put_Line ("Usage: " & CL.Command_Name &
" [-hw] [-warp] [-fullscreen]");
GNAT.OS_Lib.OS_Exit (1);
end if;
end loop;
-- Set video mode
screen := CreateScreen (Screen_Width, Screen_Height,
8, videoflags);
if screen = null then
GNAT.OS_Lib.OS_Exit (2);
end if;
-- Wait for a keystroke
done := False;
loop
Ev.Wait_Event (Wait_Event_Result, event);
exit when done or (Wait_Event_Result = 0);
case event.the_type is
when Ev.MOUSEBUTTONDOWN =>
DrawBox (screen, C.int (event.button.x),
C.int (event.button.y));
when Ev.KEYDOWN =>
-- Ignore ALT-TAB for windows
if event.key.keysym.sym = Ks.K_LALT
or event.key.keysym.sym = Ks.K_TAB then
null;
elsif event.key.keysym.sym = Ks.K_SPACE then
-- Center the mouse om <SPACE>
M.WarpMouse (Screen_Width / 2, Screen_Height / 2);
elsif event.key.keysym.sym = Ks.K_RETURN then
-- Toggle fullscreen mode on <RETURN>
videoflags := videoflags xor V.FULLSCREEN;
screen := CreateScreen (Uint16 (screen.w), Uint16 (screen.h),
screen.format.BitsPerPixel,
videoflags);
if screen = null then
Put_Line ("Couldn't toggle fullscreen mode");
done := True;
end if;
else
-- Any other key quits the application...
done := True;
end if;
when Ev.QUIT =>
done := True;
when others => null;
end case;
end loop;
SDL.SDL_Quit;
end graywin;
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