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drop libc dependencies from chip8.zr

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This commit is contained in:
Antoni Piasecki
2026-03-11 17:15:30 +01:00
parent 73265f9d1e
commit 01b98a1d45
2 changed files with 165 additions and 39 deletions
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173
examples/chip8.zr
View File

@@ -7,8 +7,6 @@ extern ClearBackground
extern DrawRectangle
extern EndDrawing
extern IsKeyDown
extern printf // TODO: replace with std
extern rand // TODO: replace with std
struct CHIP8
memory: ptr
@@ -49,7 +47,9 @@ func chip8_create[] : CHIP8
func chip8_disassemble[c: CHIP8, ins_count: i64] : void
for i in 0..ins_count
printf("0x%x: ", c->pc)
io.print("0x")
io.print_i64_hex(c->pc)
io.print(": ")
let high: i64 = c->memory[c->pc]
let low: i64 = c->memory[c->pc + 1]
@@ -72,81 +72,176 @@ func chip8_disassemble[c: CHIP8, ins_count: i64] : void
io.print("SYS ")
io.println_i64(nnn)
else if op == 0x1
printf("JP 0x%x\n", nnn)
io.print("JP 0x")
io.print_i64_hex(nnn)
io.print("\n")
else if op == 0x2
io.print("CALL ")
io.println_i64(nnn)
else if op == 0x3
printf("SE V%x, %u\n", x, kk)
io.print("SE V")
io.print_i64_hex(x)
io.print(", ")
io.println_i64(kk)
else if op == 0x4
printf("SNE V%x, %u\n", x, kk)
io.print("SNE V")
io.print_i64_hex(x)
io.print(", ")
io.println_i64(kk)
else if op == 0x5
printf("SE V%x, V%x\n", x, y)
io.print("SE V")
io.print_i64_hex(x)
io.print(", V")
io.print_i64_hex(y)
io.print("\n")
else if op == 0x6
printf("LD V%x, %u\n", x, kk)
io.print("LD V")
io.print_i64_hex(x)
io.print(", ")
io.println_i64(kk)
else if op == 0x7
printf("ADD V%x, %u\n", x, kk)
io.print("ADD V")
io.print_i64_hex(x)
io.print(", ")
io.println_i64(kk)
else if op == 0x8
if n == 0x0
printf("LD V%x, V%x\n", x, y)
io.print("LD V")
io.print_i64_hex(x)
io.print(", V")
io.print_i64_hex(y)
io.print("\n")
else if n == 0x1
printf("OR V%x, V%x\n", x, y)
io.print("OR V")
io.print_i64_hex(x)
io.print(", V")
io.print_i64_hex(y)
io.print("\n")
else if n == 0x2
printf("AND V%x, V%x\n", x, y)
io.print("AND V")
io.print_i64_hex(x)
io.print(", V")
io.print_i64_hex(y)
io.print("\n")
else if n == 0x3
printf("XOR V%x, V%x\n", x, y)
io.print("XOR V")
io.print_i64_hex(x)
io.print(", V")
io.print_i64_hex(y)
io.print("\n")
else if n == 0x4
printf("ADD V%x, V%x\n", x, y)
io.print("ADD V")
io.print_i64_hex(x)
io.print(", V")
io.print_i64_hex(y)
io.print("\n")
else if n == 0x5
printf("SUB V%x, V%x\n", x, y)
io.print("SUB V")
io.print_i64_hex(x)
io.print(", V")
io.print_i64_hex(y)
io.print("\n")
else if n == 0x6
printf("SHR V%x\n", x)
io.print("SHR V")
io.print_i64_hex(x)
io.print("\n")
else if n == 0x7
printf("SUBN V%x, V%x\n", x, y)
io.print("SUBN V")
io.print_i64_hex(x)
io.print(", V")
io.print_i64_hex(y)
io.print("\n")
else if n == 0xE
printf("SHL V%x\n", x)
io.print("SHL V")
io.print_i64_hex(x)
io.print("\n")
else
printf("??? (%x)\n", ins)
io.print("??? (")
io.print_i64_hex(ins)
io.println(")")
else if op == 0x9
printf("SNE V%x, V%x\n", x, y)
io.print("SNE V")
io.print_i64_hex(x)
io.print(", V")
io.print_i64_hex(y)
io.print("\n")
else if op == 0xa
printf("LD I, 0x%x\n", nnn)
io.print("LD I, 0x")
io.print_i64_hex(nnn)
io.print("\n")
else if op == 0xb
printf("JP V0, %u\n", nnn)
io.print("JP V0, ")
io.println_i64(nnn)
else if op == 0xc
printf("RND V%x, %u\n", x, kk)
io.print("RND V")
io.print_i64_hex(x)
io.print(", ")
io.println_i64(kk)
else if op == 0xd
printf("DRW V%x, V%x, %u\n", x, y, n)
io.print("DRW V")
io.print_i64_hex(x)
io.print(", V")
io.print_i64_hex(y)
io.print(", ")
io.println_i64(n)
else if op == 0xe
if kk == 0x9e
printf("SKP V%x\n", x)
io.print("SKP V")
io.print_i64_hex(x)
io.print("\n")
else if kk == 0xa1
printf("SKNP V%x\n", x)
io.print("SKNP V")
io.print_i64_hex(x)
io.print("\n")
else
printf("??? (%x)\n", ins)
io.print("??? (")
io.print_i64_hex(ins)
io.println(")")
else if op == 0xf
if kk == 0x07
printf("LD V%x, DT\n", x)
io.print("LD V")
io.print_i64_hex(x)
io.println(", DT")
else if kk == 0x0A
printf("LD V%x, K\n", x)
io.print("LD V")
io.print_i64_hex(x)
io.println(", K")
else if kk == 0x15
printf("LD DT, V%x\n", x)
io.print("LD DT, V")
io.print_i64_hex(x)
io.print("\n")
else if kk == 0x18
printf("LD ST, V%x\n", x)
io.print("LD ST, V")
io.print_i64_hex(x)
io.print("\n")
else if kk == 0x1E
printf("ADD I, V%x\n", x)
io.print("ADD I, V")
io.print_i64_hex(x)
io.print("\n")
else if kk == 0x29
printf("LD F, V%x\n", x)
io.print("LD F, V")
io.print_i64_hex(x)
io.print("\n")
else if kk == 0x33
printf("LD B, V%x\n", x)
io.print("LD B, V")
io.print_i64_hex(x)
io.print("\n")
else if kk == 0x55
printf("LD [I], V%x\n", x)
io.print("LD [I], V")
io.print_i64_hex(x)
io.print("\n")
else if kk == 0x65
printf("LD V%x, [I]\n", x)
io.print("LD V")
io.print_i64_hex(x)
io.println(", [I]")
else
printf("??? (%x)\n", ins)
io.print("??? (")
io.print_i64_hex(ins)
io.println(")")
else
printf("??? (%x)\n", ins)
io.print("??? (")
io.print_i64_hex(ins)
io.println(")")
func chip8_step[c: CHIP8] : void
let high: i64 = c->memory[c->pc]
@@ -219,7 +314,7 @@ func chip8_step[c: CHIP8] : void
else if op == 0xb
c->pc = nnn + c->reg[0]
else if op == 0xc
c->reg[x] = (rand() % 256) & kk
c->reg[x] = (math.floor(os.urandom_i64()) % 256) & kk
else if op == 0xd
c->reg[0xf] = 0
for row in 0..n

31
src/std/std.zr
View File

@@ -62,6 +62,11 @@ func io.print_i64[x: i64] : void
io.print(s)
mem.free(s)
func io.print_i64_hex[x: i64] : void
let s: str = str.hex_from_i64(x)
io.print(s)
mem.free(s)
func io.println_i64[x: i64] : void
let s: str = str.from_i64(x)
io.println(s)
@@ -278,6 +283,32 @@ func str.from_i64[n: i64] : str
mem.free(buf)
return s
func str.hex_from_i64[n: i64] : str
let hex_chars: str = "0123456789abcdef"
if n == 0
let out: str = mem.alloc(2)
out[0] = '0'
out[1] = 0
return out
let buf: str = mem.alloc(17)
let len = 0
while n > 0
buf[len] = hex_chars[n & 15]
n = n >> 4
len = len + 1
let out: str = mem.alloc(len + 1)
let j = 0
while j < len
out[j] = buf[len - 1 - j]
j = j + 1
out[len] = 0
return out
func str.from_char[c: u8] : str
let s: str = mem.alloc(2)
s[0] = c