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ada-chip
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run cleanup; magic constants to enums

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Clyne 2 weeks ago
parent ffecebbda1
commit a80dce67fd
Signed by: clyne
GPG Key ID: 3267C8EBF3F9AFC7
2 changed files with 96 additions and 87 deletions
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137
src/ada_chip.adb
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@ -11,20 +11,18 @@ with CPU;
with Video; with Video;
procedure Ada_Chip is procedure Ada_Chip is
use Sf.Audio;
package Random_Byte is new Ada.Numerics.Discrete_Random (ISA.Byte); package Random_Byte is new Ada.Numerics.Discrete_Random (ISA.Byte);
Steps_Per_Frame : constant := 12; Steps_Per_Frame : constant := 8;
State : CPU.Instance; State : CPU.Instance;
Random_Generator : Random_Byte.Generator; Random_Generator : Random_Byte.Generator;
Delay_Timer : ISA.Byte := 0; Delay_Timer : Natural := 0;
Sound_Timer : ISA.Byte := 0; Sound_Timer : Natural := 0;
Beep_Sound_Buffer : constant sfSoundBuffer_Ptr := Beep_Sound_Buffer : constant Sf.Audio.sfSoundBuffer_Ptr :=
SoundBuffer.createFromFile ("beep.ogg"); Sf.Audio.SoundBuffer.createFromFile ("beep.ogg");
Beep_Sound : constant sfSound_Ptr := Sound.create; Beep_Sound : constant Sf.Audio.sfSound_Ptr := Sf.Audio.Sound.create;
procedure Draw_Sprite (VX, VY : ISA.Register_Index; N : ISA.Byte) is procedure Draw_Sprite (VX, VY : ISA.Register_Index; N : ISA.Byte) is
use Sf; use Sf;
@ -56,23 +54,69 @@ procedure Ada_Chip is
State.Registers (15) := (if VF then 1 else 0); State.Registers (15) := (if VF then 1 else 0);
end Draw_Sprite; end Draw_Sprite;
procedure Run_Step is procedure Run_Flow (ins : ISA.Opcode) is
use ISA;
ins : Opcode;
begin begin
ins := CPU.Get_Opcode (State); case ins.Value is
case ins.Class is
when Flow => case Byte (ins.Value) is
when ISA.Clear_Screen => Video.Clear_Screen; when ISA.Clear_Screen => Video.Clear_Screen;
when ISA.Ret => CPU.Ret (State); when ISA.Ret => CPU.Ret (State);
when others => begin when others => begin
Ada.Text_IO.Put_Line ("Unknown flow instruction!"); Ada.Text_IO.Put_Line ("Machine code calls are unsupported!");
Ada.Text_IO.Put_Line (Opcode_Value'Image (ins.Value));
delay 1.0; delay 1.0;
Video.Finish; Video.Finish;
end; end;
end case; end case;
end Run_Flow;
procedure Run_Input (ins : ISA.Opcode) is
use ISA;
Key : constant Video.Key := Video.Key
(State.Registers (X_Register (ins)) mod 16);
begin
case Input_Class'Enum_Val (ins.Value mod 256) is
when Key_Down =>
if Video.Key_Down (Key) then
CPU.Skip (State);
end if;
when Key_Up =>
if Video.Key_Up (Key) then
CPU.Skip (State);
end if;
end case;
end Run_Input;
procedure Run_Misc (ins : ISA.Opcode) is
use ISA;
X : constant Register_Index := X_Register (ins);
begin
case Misc_Class'Enum_Val (ins.Value mod 256) is
when Get_Delay => State.Registers (X) := Byte (Delay_Timer);
when Get_Key => State.Registers (X) := Byte (Video.Next_Key);
when Set_Delay => Delay_Timer := Natural (State.Registers (X));
when Set_Sound => Sound_Timer := Natural (State.Registers (X));
when Reg_Store => CPU.Reg_Store (State, X);
when Reg_Load => CPU.Reg_Load (State, X);
when Add_Address => State.Address_Register :=
State.Address_Register + Address (State.Registers (X));
when Get_Font =>
State.Address_Register := Address (State.Registers (X) mod 16) * 5;
when Get_BCD => begin
State.Memory (State.Address_Register) :=
State.Registers (X) / 100;
State.Memory (State.Address_Register + 1) :=
State.Registers (X) / 10 mod 10;
State.Memory (State.Address_Register + 2) :=
State.Registers (X) mod 10;
end;
end case;
end Run_Misc;
procedure Run_Step is
use ISA;
ins : Opcode;
begin
ins := CPU.Get_Opcode (State);
case ins.Class is
when Flow => Run_Flow (ins);
when Jump => CPU.Jump (State, Address (ins.Value)); when Jump => CPU.Jump (State, Address (ins.Value));
when Call => CPU.Call (State, Address (ins.Value)); when Call => CPU.Call (State, Address (ins.Value));
when Equal => when Equal =>
@ -111,55 +155,8 @@ procedure Ada_Chip is
when Draw_Sprite => when Draw_Sprite =>
Draw_Sprite (X_Register (ins), Y_Register (ins), Draw_Sprite (X_Register (ins), Y_Register (ins),
To_Byte (ins) mod 16); To_Byte (ins) mod 16);
when Input => case To_Byte (ins) is when Input => Run_Input (ins);
when ISA.Key_Down => when Misc => Run_Misc (ins);
if Video.Key_Down
(Video.Key (State.Registers (X_Register (ins)) mod 16))
then
CPU.Skip (State);
end if;
when ISA.Key_Up =>
if Video.Key_Up
(Video.Key (State.Registers (X_Register (ins)) mod 16))
then
CPU.Skip (State);
end if;
when others => null;
end case;
when Misc => case To_Byte (ins) is
when ISA.Get_Delay =>
State.Registers (X_Register (ins)) := Delay_Timer;
when ISA.Get_Key =>
State.Registers (X_Register (ins)) := Byte (Video.Next_Key);
when ISA.Set_Delay =>
Delay_Timer := State.Registers (X_Register (ins));
when ISA.Set_Sound =>
Sound_Timer := State.Registers (X_Register (ins));
when ISA.Add_Address =>
State.Address_Register := State.Address_Register +
Address (State.Registers (X_Register (ins)));
when ISA.Get_Font =>
State.Address_Register :=
Address (State.Registers (X_Register (ins)) mod 16) * 5;
when ISA.Get_BCD => begin
State.Memory (State.Address_Register) :=
State.Registers (X_Register (ins)) / 100;
State.Memory (State.Address_Register + 1) :=
State.Registers (X_Register (ins)) / 10 mod 10;
State.Memory (State.Address_Register + 2) :=
State.Registers (X_Register (ins)) mod 10;
end;
when ISA.Reg_Store =>
CPU.Reg_Store (State, X_Register (ins));
when ISA.Reg_Load =>
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 when others => begin
Ada.Text_IO.Put_Line ("Unknown instruction class!"); Ada.Text_IO.Put_Line ("Unknown instruction class!");
Ada.Text_IO.Put_Line (Opcode_Class'Image (ins.Class)); Ada.Text_IO.Put_Line (Opcode_Class'Image (ins.Class));
@ -168,8 +165,6 @@ procedure Ada_Chip is
end; end;
end case; end case;
end Run_Step; end Run_Step;
use ISA;
begin begin
if Ada.Command_Line.Argument_Count /= 1 then if Ada.Command_Line.Argument_Count /= 1 then
Ada.Text_IO.Put_Line ("usage: adachip <.c8 file>"); Ada.Text_IO.Put_Line ("usage: adachip <.c8 file>");
@ -177,7 +172,7 @@ begin
Video.Initialize; Video.Initialize;
Random_Byte.Reset (Random_Generator); Random_Byte.Reset (Random_Generator);
CPU.Load_File (State, Ada.Command_Line.Argument (1)); CPU.Load_File (State, Ada.Command_Line.Argument (1));
Sound.setBuffer (Beep_Sound, Beep_Sound_Buffer); Sf.Audio.Sound.setBuffer (Beep_Sound, Beep_Sound_Buffer);
while Video.Is_Running loop while Video.Is_Running loop
Video.Display; Video.Display;
@ -188,7 +183,7 @@ begin
end if; end if;
if Sound_Timer > 0 then if Sound_Timer > 0 then
Sound.play (Beep_Sound); Sf.Audio.Sound.play (Beep_Sound);
Sound_Timer := Sound_Timer - 1; Sound_Timer := Sound_Timer - 1;
end if; end if;
@ -197,6 +192,6 @@ begin
end loop; end loop;
end loop; end loop;
Sound.destroy (Beep_Sound); Sf.Audio.Sound.destroy (Beep_Sound);
end if; end if;
end Ada_Chip; end Ada_Chip;

42
src/isa.ads
Unescape Escape View File

@ -40,21 +40,35 @@ package ISA is
Random => 12, Random => 12,
Draw_Sprite => 13, Draw_Sprite => 13,
Input => 14, Input => 14,
Misc => 15); Misc => 15
);
Clear_Screen : constant Byte := 16#E0#; Clear_Screen : constant Opcode_Value := 16#E0#;
Ret : constant Byte := 16#EE#; Ret : constant Opcode_Value := 16#EE#;
Key_Down : constant Byte := 16#9E#;
Key_Up : constant Byte := 16#A1#; type Input_Class is (Key_Down, Key_Up);
Get_Delay : constant Byte := 16#07#;
Get_Key : constant Byte := 16#0A#; for Input_Class use (
Set_Delay : constant Byte := 16#15#; Key_Down => 16#9E#,
Set_Sound : constant Byte := 16#18#; Key_Up => 16#A1#
Add_Address : constant Byte := 16#1E#; );
Get_Font : constant Byte := 16#29#;
Get_BCD : constant Byte := 16#33#; type Misc_Class is (
Reg_Store : constant Byte := 16#55#; Get_Delay, Get_Key, Set_Delay, Set_Sound, Add_Address, Get_Font, Get_BCD,
Reg_Load : constant Byte := 16#65#; Reg_Store, Reg_Load
);
for Misc_Class use (
Get_Delay => Opcode_Value (16#07#),
Get_Key => Opcode_Value (16#0A#),
Set_Delay => Opcode_Value (16#15#),
Set_Sound => Opcode_Value (16#18#),
Add_Address => Opcode_Value (16#1E#),
Get_Font => Opcode_Value (16#29#),
Get_BCD => Opcode_Value (16#33#),
Reg_Store => Opcode_Value (16#55#),
Reg_Load => Opcode_Value (16#65#)
);
Start_Address : constant Address := 16#200#; Start_Address : constant Address := 16#200#;

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