clyne
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ada-chip
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Clyne 2 weeks ago
parent cf8c3a51cb
commit 8fa66b024f
Signed by: clyne
GPG Key ID: 7BA5A2980566A649
18 changed files with 707 additions and 7 deletions
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12
.gitignore vendored
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# ---> Ada
# Object file
*.o
# Ada Library Information
*.ali
alire
bin
obj
*.c8
*.ch8

22
ada_chip.gpr
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with "config/adachip_config.gpr";
project Ada_Chip is
for Source_Dirs use ("src/", "config/");
for Object_Dir use "obj/" & Adachip_Config.Build_Profile;
for Create_Missing_Dirs use "True";
for Exec_Dir use "bin";
for Main use ("ada_chip.adb");
package Compiler is
for Default_Switches ("Ada") use Adachip_Config.Ada_Compiler_Switches;
end Compiler;
package Binder is
for Switches ("Ada") use ("-Es"); -- Symbolic traceback
end Binder;
package Install is
for Artifacts (".") use ("share");
end Install;
end Ada_Chip;

15
alire.toml
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name = "ada_chip"
description = "CHIP 8 emulator written in Ada"
version = "0.1.0-dev"
authors = ["Clyne Sullivan"]
maintainers = ["Clyne Sullivan <clyne@bitgloo.com>"]
maintainers-logins = ["clyne"]
licenses = "GPL-3.0-or-later"
website = "https://code.bitgloo.com/clyne/ada-chip"
tags = []
executables = ["ada_chip"]
[[depends-on]]
asfml = "^2.6.1"

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config/ada_chip_config.ads
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-- Configuration for ada_chip generated by Alire
pragma Restrictions (No_Elaboration_Code);
pragma Style_Checks (Off);
package Ada_Chip_Config is
pragma Pure;
Crate_Version : constant String := "0.1.0-dev";
Crate_Name : constant String := "ada_chip";
Alire_Host_OS : constant String := "linux";
Alire_Host_Arch : constant String := "x86_64";
Alire_Host_Distro : constant String := "debian";
type Build_Profile_Kind is (release, validation, development);
Build_Profile : constant Build_Profile_Kind := development;
end Ada_Chip_Config;

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config/ada_chip_config.gpr
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-- Configuration for ada_chip generated by Alire
with "asfml.gpr";
abstract project Ada_Chip_Config is
Crate_Version := "0.1.0-dev";
Crate_Name := "ada_chip";
Alire_Host_OS := "linux";
Alire_Host_Arch := "x86_64";
Alire_Host_Distro := "debian";
Ada_Compiler_Switches := External_As_List ("ADAFLAGS", " ");
Ada_Compiler_Switches := Ada_Compiler_Switches &
(
"-Og" -- Optimize for debug
,"-ffunction-sections" -- Separate ELF section for each function
,"-fdata-sections" -- Separate ELF section for each variable
,"-g" -- Generate debug info
,"-gnatwa" -- Enable all warnings
,"-gnatw.X" -- Disable warnings for No_Exception_Propagation
,"-gnatVa" -- All validity checks
,"-gnaty3" -- Specify indentation level of 3
,"-gnatya" -- Check attribute casing
,"-gnatyA" -- Use of array index numbers in array attributes
,"-gnatyB" -- Check Boolean operators
,"-gnatyb" -- Blanks not allowed at statement end
,"-gnatyc" -- Check comments
,"-gnaty-d" -- Disable check no DOS line terminators present
,"-gnatye" -- Check end/exit labels
,"-gnatyf" -- No form feeds or vertical tabs
,"-gnatyh" -- No horizontal tabs
,"-gnatyi" -- Check if-then layout
,"-gnatyI" -- check mode IN keywords
,"-gnatyk" -- Check keyword casing
,"-gnatyl" -- Check layout
,"-gnatym" -- Check maximum line length
,"-gnatyn" -- Check casing of entities in Standard
,"-gnatyO" -- Check that overriding subprograms are explicitly marked as such
,"-gnatyp" -- Check pragma casing
,"-gnatyr" -- Check identifier references casing
,"-gnatyS" -- Check no statements after THEN/ELSE
,"-gnatyt" -- Check token spacing
,"-gnatyu" -- Check unnecessary blank lines
,"-gnatyx" -- Check extra parentheses
,"-gnatW8" -- UTF-8 encoding for wide characters
);
type Build_Profile_Kind is ("release", "validation", "development");
Build_Profile : Build_Profile_Kind := "development";
end Ada_Chip_Config;

20
config/ada_chip_config.h
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/* Configuration for ada_chip generated by Alire */
#ifndef ADA_CHIP_CONFIG_H
#define ADA_CHIP_CONFIG_H
#define CRATE_VERSION "0.1.0-dev"
#define CRATE_NAME "ada_chip"
#define ALIRE_HOST_OS "linux"
#define ALIRE_HOST_ARCH "x86_64"
#define ALIRE_HOST_DISTRO "debian"
#define BUILD_PROFILE_RELEASE 1
#define BUILD_PROFILE_VALIDATION 2
#define BUILD_PROFILE_DEVELOPMENT 3
#define BUILD_PROFILE 3
#endif

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config/adachip_config.ads
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-- Configuration for adachip generated by Alire
pragma Restrictions (No_Elaboration_Code);
pragma Style_Checks (Off);
package Adachip_Config is
pragma Pure;
Crate_Version : constant String := "0.1.0-dev";
Crate_Name : constant String := "adachip";
Alire_Host_OS : constant String := "linux";
Alire_Host_Arch : constant String := "x86_64";
Alire_Host_Distro : constant String := "debian";
type Build_Profile_Kind is (release, validation, development);
Build_Profile : constant Build_Profile_Kind := development;
end Adachip_Config;

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config/adachip_config.gpr
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-- Configuration for adachip generated by Alire
with "asfml.gpr";
abstract project Adachip_Config is
Crate_Version := "0.1.0-dev";
Crate_Name := "adachip";
Alire_Host_OS := "linux";
Alire_Host_Arch := "x86_64";
Alire_Host_Distro := "debian";
Ada_Compiler_Switches := External_As_List ("ADAFLAGS", " ");
Ada_Compiler_Switches := Ada_Compiler_Switches &
(
"-Og"
,"-gnat2022"
,"-ffunction-sections" -- Separate ELF section for each function
,"-fdata-sections" -- Separate ELF section for each variable
,"-g" -- Generate debug info
,"-gnatwa" -- Enable all warnings
,"-gnatw.X" -- Disable warnings for No_Exception_Propagation
,"-gnatVa" -- All validity checks
,"-gnaty3" -- Specify indentation level of 3
,"-gnatya" -- Check attribute casing
,"-gnatyA" -- Use of array index numbers in array attributes
,"-gnatyB" -- Check Boolean operators
,"-gnatyb" -- Blanks not allowed at statement end
,"-gnatyc" -- Check comments
,"-gnaty-d" -- Disable check no DOS line terminators present
,"-gnatye" -- Check end/exit labels
,"-gnatyf" -- No form feeds or vertical tabs
,"-gnatyh" -- No horizontal tabs
,"-gnatyi" -- Check if-then layout
,"-gnatyI" -- check mode IN keywords
,"-gnatyk" -- Check keyword casing
,"-gnatyl" -- Check layout
,"-gnatym" -- Check maximum line length
,"-gnatyn" -- Check casing of entities in Standard
,"-gnatyO" -- Check that overriding subprograms are explicitly marked as such
,"-gnatyp" -- Check pragma casing
,"-gnatyr" -- Check identifier references casing
,"-gnatyS" -- Check no statements after THEN/ELSE
,"-gnatyt" -- Check token spacing
,"-gnatyu" -- Check unnecessary blank lines
,"-gnatyx" -- Check extra parentheses
,"-gnatW8" -- UTF-8 encoding for wide characters
);
type Build_Profile_Kind is ("release", "validation", "development");
Build_Profile : Build_Profile_Kind := "development";
end Adachip_Config;

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config/adachip_config.h
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/* Configuration for adachip generated by Alire */
#ifndef ADACHIP_CONFIG_H
#define ADACHIP_CONFIG_H
#define CRATE_VERSION "0.1.0-dev"
#define CRATE_NAME "adachip"
#define ALIRE_HOST_OS "linux"
#define ALIRE_HOST_ARCH "x86_64"
#define ALIRE_HOST_DISTRO "debian"
#define BUILD_PROFILE_RELEASE 1
#define BUILD_PROFILE_VALIDATION 2
#define BUILD_PROFILE_DEVELOPMENT 3
#define BUILD_PROFILE 3
#endif

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src/ada_chip.adb
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with Ada.Command_Line;
with Ada.Numerics.Discrete_Random;
with Ada.Text_IO;
with Sf;
with ISA; use ISA;
with CPU;
with Video;
procedure Ada_Chip is
package Random_Byte is new Ada.Numerics.Discrete_Random (Byte);
Steps_Per_Frame : constant := 16;
State : CPU.Instance;
Random_Generator : Random_Byte.Generator;
procedure Draw_Sprite (VX, VY : Register_Index; N : Byte) is
use Sf;
X, Y : sfUint32;
Row : aliased Byte;
Row_Pixels : Pixel with Address => Row'Address;
VF : Boolean := False;
begin
X := sfUint32 (State.Registers (VX));
Y := sfUint32 (State.Registers (VY));
for I in 0 .. N - 1 loop
Row := State.Memory (State.Address_Register + Address (I));
for J in 0 .. 7 loop
if Row_Pixels (7 - J) then
if Video.Toggle_Pixel (X + sfUint32 (J), Y + sfUint32 (I)) then
VF := True;
end if;
end if;
end loop;
end loop;
State.Registers (15) := (if VF then 1 else 0);
end Draw_Sprite;
procedure Run_Step is
ins : Opcode;
begin
ins := CPU.Get_Opcode (State);
case ins.Class is
when Flow =>
case ins.Value is
when 16#E0# => Video.Clear_Screen;
when 16#EE# => CPU.Ret (State);
when others => begin
Ada.Text_IO.Put_Line ("Unknown flow instruction!");
Ada.Text_IO.Put_Line (Opcode_Value'Image (ins.Value));
delay 1.0;
Video.Finish;
end;
end case;
when Jump => CPU.Jump (State, Address (ins.Value));
when Call => CPU.Call (State, Address (ins.Value));
when Equal =>
if State.Registers (X_Register (ins)) = To_Byte (ins) then
CPU.Skip (State);
end if;
when Not_Equal =>
if State.Registers (X_Register (ins)) /= To_Byte (ins) then
CPU.Skip (State);
end if;
when Compare =>
if State.Registers (X_Register (ins)) =
State.Registers (Y_Register (ins))
then
CPU.Skip (State);
end if;
when Set_Register =>
State.Registers (X_Register (ins)) := To_Byte (ins);
when Add =>
State.Registers (X_Register (ins)) :=
State.Registers (X_Register (ins)) + To_Byte (ins);
when Math =>
CPU.Math (State, X_Register (ins), Y_Register (ins),
To_Byte (ins) mod 16);
when Not_Compare =>
if State.Registers (X_Register (ins)) /=
State.Registers (Y_Register (ins))
then
CPU.Skip (State);
end if;
when Set_Address =>
State.Address_Register := Address (ins.Value);
when Random =>
State.Registers (X_Register (ins)) :=
Random_Byte.Random (Random_Generator) mod To_Byte (ins);
when Draw_Sprite =>
Draw_Sprite (X_Register (ins), Y_Register (ins),
To_Byte (ins) mod 16);
when Misc =>
case To_Byte (ins) is
when 16#07# =>
State.Registers (X_Register (ins)) := State.Delay_Timer;
when 16#15# =>
State.Delay_Timer := State.Registers (X_Register (ins));
when 16#1E# =>
State.Address_Register := State.Address_Register +
Address (State.Registers (X_Register (ins)));
when 16#55# =>
CPU.Reg_Store (State, X_Register (ins));
when 16#65# =>
CPU.Reg_Load (State, X_Register (ins));
when others => begin
Ada.Text_IO.Put_Line ("Unknown misc instruction!");
Ada.Text_IO.Put_Line (Opcode_Value'Image (ins.Value));
delay 1.0;
Video.Finish;
end;
end case;
when others => begin
Ada.Text_IO.Put_Line ("Unknown instruction class!");
Ada.Text_IO.Put_Line (Opcode_Class'Image (ins.Class));
delay 1.0;
Video.Finish;
end;
end case;
end Run_Step;
begin
if Ada.Command_Line.Argument_Count /= 1 then
Ada.Text_IO.Put_Line ("usage: adachip <.c8 file>");
else
Video.Initialize;
Random_Byte.Reset (Random_Generator);
CPU.Load_File (State, Ada.Command_Line.Argument (1));
while Video.Is_Running loop
Video.Display;
if State.Delay_Timer > 0 then
State.Delay_Timer := State.Delay_Timer - 1;
end if;
for I in 0 .. Steps_Per_Frame loop
Run_Step;
end loop;
end loop;
end if;
end Ada_Chip;

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src/bit_ops.adb
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package body Bit_Ops is
function Bitwise_Or (X, Y : Byte) return Byte is
X_Bits : Pixel with Address => X'Address;
Y_Bits : Pixel with Address => Y'Address;
Bits : aliased Pixel;
Bits_Byte : Byte with Address => Bits'Address;
begin
Bits := X_Bits or Y_Bits;
return Bits_Byte;
end Bitwise_Or;
function Bitwise_And (X, Y : Byte) return Byte is
X_Bits : Pixel with Address => X'Address;
Y_Bits : Pixel with Address => Y'Address;
Bits : aliased Pixel;
Bits_Byte : Byte with Address => Bits'Address;
begin
Bits := X_Bits and Y_Bits;
return Bits_Byte;
end Bitwise_And;
function Bitwise_Xor (X, Y : Byte) return Byte is
X_Bits : Pixel with Address => X'Address;
Y_Bits : Pixel with Address => Y'Address;
Bits : aliased Pixel;
Bits_Byte : Byte with Address => Bits'Address;
begin
Bits := X_Bits xor Y_Bits;
return Bits_Byte;
end Bitwise_Xor;
end Bit_Ops;

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src/bit_ops.ads
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with ISA;
package Bit_Ops is
use ISA;
function Bitwise_Or (X, Y : Byte) return Byte;
function Bitwise_And (X, Y : Byte) return Byte;
function Bitwise_Xor (X, Y : Byte) return Byte;
end Bit_Ops;

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src/cpu.adb
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with Ada.Sequential_IO;
with Ada.Text_IO;
with Bit_Ops;
package body CPU is
function Get_Opcode (Inst : in out Instance) return Opcode is
Op : aliased Opcode_Raw;
Op_Record : Opcode with Address => Op'Address;
begin
Op := Opcode_Raw (Inst.Memory (Inst.Program_Counter)) * 2 ** 8;
Op := Op + Opcode_Raw (Inst.Memory (Inst.Program_Counter + 1));
Inst.Program_Counter := Inst.Program_Counter + 2;
return Op_Record;
end Get_Opcode;
procedure Reg_Store (Inst : in out Instance; VX : Register_Index) is
begin
for I in 0 .. VX loop
Inst.Memory (Inst.Address_Register + Address (I)) :=
Inst.Registers (I);
end loop;
end Reg_Store;
procedure Reg_Load (Inst : in out Instance; VX : Register_Index) is
begin
for I in 0 .. VX loop
Inst.Registers (I) := Inst.Memory
(Inst.Address_Register + Address (I));
end loop;
end Reg_Load;
procedure Ret (Inst : in out Instance) is
begin
Jump (Inst, Inst.Stack.Last_Element);
Inst.Stack.Delete_Last;
end Ret;
procedure Call (Inst : in out Instance; A : Address) is
begin
Inst.Stack.Append (Inst.Program_Counter);
Jump (Inst, A);
end Call;
procedure Jump (Inst : in out Instance; A : Address) is
begin
Inst.Program_Counter := A;
end Jump;
procedure Skip (Inst : in out Instance) is
begin
Inst.Program_Counter := Inst.Program_Counter + 2;
end Skip;
procedure Math (Inst : in out Instance; VX, VY : Register_Index; N : Byte)
is begin
case N is
when 0 =>
Inst.Registers (VX) := Inst.Registers (VY);
when 1 =>
Inst.Registers (VX) := Bit_Ops.Bitwise_Or
(Inst.Registers (VX), Inst.Registers (VY));
when 2 =>
Inst.Registers (VX) := Bit_Ops.Bitwise_And
(Inst.Registers (VX), Inst.Registers (VY));
when 3 =>
Inst.Registers (VX) := Bit_Ops.Bitwise_Xor
(Inst.Registers (VX), Inst.Registers (VY));
when 4 =>
declare
X : constant Byte := Inst.Registers (VX);
Y : constant Byte := Inst.Registers (VY);
begin
Inst.Registers (VX) := X + Y;
Inst.Registers (15) :=
(if Integer (X) + Integer (Y) > Integer (X + Y)
then 1 else 0);
end;
when 5 =>
declare
X : constant Byte := Inst.Registers (VX);
Y : constant Byte := Inst.Registers (VY);
begin
Inst.Registers (VX) := X - Y;
Inst.Registers (15) := (if X >= Y then 1 else 0);
end;
when 6 =>
Inst.Registers (15) := Inst.Registers (VX) mod 2;
Inst.Registers (VX) := Inst.Registers (VX) / 2;
when 14 =>
Inst.Registers (15) := Inst.Registers (VX) / (2 ** 7);
Inst.Registers (VX) := Inst.Registers (VX) * 2;
when others => begin
Ada.Text_IO.Put_Line ("Uh oh!");
Ada.Text_IO.Put_Line (Byte'Image (N));
end;
end case;
end Math;
procedure Load_File (Inst : in out Instance; File_Name : String) is
package Byte_IO is new Ada.Sequential_IO (Byte);
I : Address := Start_Address;
File_Handle : Byte_IO.File_Type;
begin
Byte_IO.Open (File_Handle, Byte_IO.In_File, File_Name);
while not Byte_IO.End_Of_File (File_Handle) loop
Byte_IO.Read (File_Handle, Inst.Memory (I));
I := I + 1;
end loop;
Byte_IO.Close (File_Handle);
end Load_File;
end CPU;

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src/cpu.ads
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with Ada.Containers.Vectors;
with ISA;
package CPU is
use ISA;
package Address_Stack is new Ada.Containers.Vectors
(Index_Type => Natural, Element_Type => Address);
type Instance is record
Memory : Bank;
Registers : Register_Bank;
Program_Counter : Address := Start_Address;
Address_Register : Address := 0;
Stack : Address_Stack.Vector;
Delay_Timer : Byte := 0;
end record;
procedure Load_File (Inst : in out Instance; File_Name : String);
function Get_Opcode (Inst : in out Instance) return Opcode;
procedure Reg_Store (Inst : in out Instance; VX : Register_Index);
procedure Reg_Load (Inst : in out Instance; VX : Register_Index);
procedure Ret (Inst : in out Instance);
procedure Call (Inst : in out Instance; A : Address);
procedure Jump (Inst : in out Instance; A : Address);
procedure Skip (Inst : in out Instance);
procedure Math (Inst : in out Instance; VX, VY : Register_Index; N : Byte);
end CPU;

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src/isa.adb
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package body ISA is
function To_Byte (O : Opcode) return Byte
is (Byte (O.Value mod 256));
function X_Register (O : Opcode) return Register_Index
is (Register_Index (O.Value / 256));
function Y_Register (O : Opcode) return Register_Index
is (Register_Index (O.Value / 16 mod 16));
end ISA;

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src/isa.ads
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package ISA is
type Byte is mod 2 ** 8;
type Address is mod 2 ** 12;
type Register_Index is mod 2 ** 4;
type Bank is array (Address) of Byte;
type Register_Bank is array (Register_Index) of Byte;
type Pixel is array (0 .. 7) of Boolean;
pragma Pack (Pixel);
type Opcode_Value is mod 2 ** 12;
type Opcode_Class is (
Flow, Jump, Call, Equal, Not_Equal, Compare, Set_Register, Add, Math,
Not_Compare, Set_Address, Jump_Relative, Random, Draw_Sprite, Input, Misc
) with Size => 4;
type Opcode_Raw is mod 2 ** 16;
type Opcode is record
Value : Opcode_Value;
Class : Opcode_Class;
end record with
Size => 16;
for Opcode use record
Value at 0 range 0 .. 11;
Class at 0 range 12 .. 15;
end record;
for Opcode_Class use (
Flow => 0,
Jump => 1,
Call => 2,
Equal => 3,
Not_Equal => 4,
Compare => 5,
Set_Register => 6,
Add => 7,
Math => 8,
Not_Compare => 9,
Set_Address => 10,
Jump_Relative => 11,
Random => 12,
Draw_Sprite => 13,
Input => 14,
Misc => 15);
Start_Address : constant Address := 16#200#;
function To_Byte (O : Opcode) return Byte;
function X_Register (O : Opcode) return Register_Index;
function Y_Register (O : Opcode) return Register_Index;
end ISA;

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src/video.adb
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with Sf.Window;
with Sf.Window.Event;
with Sf.Graphics.Color;
package body Video is
procedure Clear_Screen is
begin
for X in 0 .. sfUint32 (Width) - 1 loop
for Y in 0 .. sfUint32 (Height) - 1 loop
Image.setPixel (Pixels, X, Y, Color.sfBlack);
end loop;
end loop;
end Clear_Screen;
procedure Initialize is
begin
Sprite.setTexture (Pixels_Sprite, Pixels_Texture);
Sprite.setPosition (Pixels_Sprite, (Float (0), Float (0)));
Sprite.setScale (Pixels_Sprite, (Float (Scale), Float (Scale)));
RenderWindow.setFramerateLimit (app, 60);
end Initialize;
function Is_Running return Boolean is
begin
return RenderWindow.isOpen (app) = sfTrue;
end Is_Running;
procedure Display is
use Sf.Window.Event;
e : sfEvent;
begin
while RenderWindow.pollEvent (app, event => e) = sfTrue loop
if e.eventType = sfEvtClosed then
RenderWindow.close (app);
end if;
end loop;
RenderWindow.clear (app, Color.sfWhite);
Texture.updateFromImage (Pixels_Texture, Pixels, 0, 0);
RenderWindow.drawSprite (app, Pixels_Sprite);
RenderWindow.display (app);
end Display;
function Toggle_Pixel (X, Y : sfUint32) return Boolean is
use Color;
P : constant sfColor := Image.getPixel (Pixels, X, Y);
R : constant Boolean := P = sfWhite;
begin
Image.setPixel (Pixels, X, Y, (if R then sfBlack else sfWhite));
return R;
end Toggle_Pixel;
procedure Finish is
begin
RenderWindow.close (app);
end Finish;
end Video;

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src/video.ads
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with Sf;
with Sf.Graphics;
with Sf.Graphics.Image;
with Sf.Graphics.RenderWindow;
with Sf.Graphics.Sprite;
with Sf.Graphics.Texture;
package Video is
use Sf;
use Sf.Graphics;
Width : constant := 64;
Height : constant := 32;
Scale : constant := 10;
Title : constant String := "Ada-Chip";
procedure Clear_Screen;
procedure Initialize;
function Is_Running return Boolean;
procedure Display;
function Toggle_Pixel (X, Y : sfUint32) return Boolean;
procedure Finish;
private
Pixels : constant sfImage_Ptr := Image.create (Width, Height);
Pixels_Sprite : constant sfSprite_Ptr := Sprite.create;
Pixels_Texture : constant sfTexture_Ptr :=
Texture.createFromImage (Pixels);
app : constant sfRenderWindow_Ptr := RenderWindow.create
((Width * Scale, Height * Scale, 32), Title);
end Video;
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