feat: initial commit

5 files changed, 1271 insertions, 0 deletions

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..2742e4d
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,6 @@
+* text=auto eol=lf
+
+# Older git versions try to fix line endings on images, this prevents it.
+*.png binary
+*.jpg binary
+*.ico binary
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bc583bd
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+hare-chip8
+roms/**
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
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+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program 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 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..7318f60
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,20 @@
+.POSIX:
+.SUFFIXES:
+HARE = hare
+HAREFLAGS = -lSDL2
+
+DESTDIR =
+PREFIX = /usr/local
+
+all: hare-chip8
+
+hare-chip8:
+	$(HARE) build $(HAREFLAGS) -o $@ .
+
+check:
+	$(HARE) test $(HAREFLAGS)
+
+clean:
+	rm -f hare-chip8
+
+.PHONY: all check clean
diff --git a/main.ha b/main.ha
new file mode 100644
index 0000000..7a4e135
--- /dev/null
+++ b/main.ha
@@ -0,0 +1,569 @@
+use fmt;
+use fs;
+use io;
+use math::random;
+use os;
+use time;
+use types;
+use sdl2;
+
+def SCALE: int = 10;
+def CLOCKSPEED: int = 540;
+
+def SCREEN_WIDTH: size = 64;
+def SCREEN_HEIGHT: size = 32;
+
+def MEM_SIZE: size = 4096;
+def START_ADDR: u16 = 0x200;
+
+def FONT_SIZE: size = 80;
+def FONT: [FONT_SIZE]u8 = [
+	0xF0, 0x90, 0x90, 0x90, 0xF0, // 0
+	0x20, 0x60, 0x20, 0x20, 0x70, // 1
+	0xF0, 0x10, 0xF0, 0x80, 0xF0, // 2
+	0xF0, 0x10, 0xF0, 0x10, 0xF0, // 3
+	0x90, 0x90, 0xF0, 0x10, 0x10, // 4
+	0xF0, 0x80, 0xF0, 0x10, 0xF0, // 5
+	0xF0, 0x80, 0xF0, 0x90, 0xF0, // 6
+	0xF0, 0x10, 0x20, 0x40, 0x40, // 7
+	0xF0, 0x90, 0xF0, 0x90, 0xF0, // 8
+	0xF0, 0x90, 0xF0, 0x10, 0xF0, // 9
+	0xF0, 0x90, 0xF0, 0x90, 0x90, // A
+	0xE0, 0x90, 0xE0, 0x90, 0xE0, // B
+	0xF0, 0x80, 0x80, 0x80, 0xF0, // C
+	0xE0, 0x90, 0x90, 0x90, 0xE0, // D
+	0xF0, 0x80, 0xF0, 0x80, 0xF0, // E
+	0xF0, 0x80, 0xF0, 0x80, 0x80  // F
+];
+
+type inst = struct {
+	op: u16,
+	X: u8,
+	Y: u8,
+	N: u8,
+	NN: u8,
+	NNN: u16
+};
+
+type state = struct {
+	mem: [MEM_SIZE]u8,
+	display: [SCREEN_WIDTH * SCREEN_HEIGHT]bool,
+	draw: bool,
+	keys: [16]bool,
+	stack: [16]u16,
+	SP: u16,
+	PC: u16,
+	V: [16]u8,
+	I: u16,
+	DT: u8,
+	ST: u8,
+};
+
+fn chip8() state = {
+	let state = state {
+		PC = START_ADDR,
+		...
+	};
+
+	state.mem[..FONT_SIZE] = FONT[..];
+
+	return state;
+};
+
+fn reset(state: *state) void = {
+	state.display = [false...];
+	state.keys = [false...];
+	state.stack = [0...];
+	state.SP = 0;
+	state.PC = START_ADDR;
+	state.V = [0...];
+	state.I = 0;
+	state.DT = 0;
+	state.ST = 0;
+
+	state.mem[..FONT_SIZE] = FONT[..];
+};
+
+fn instruction(opcode: u16) inst = inst {
+	op = opcode,
+	X = (opcode >> 8): u8 & 0x0F,
+	Y = (opcode >> 4): u8 & 0x0F,
+	N = opcode: u8 & 0x0F,
+	NN = opcode: u8 & 0xFF,
+	NNN = opcode & 0x0FFF,
+};
+
+fn print_instruction(state: *state, inst: inst) void = {
+	fmt::printf("Address: 0x{:.4X}, OP: 0x{:.4X}, Desc: ", state.PC - 2, inst.op)!;
+
+	switch ((inst.op & 0xF000) >> 12) {
+	case 0x00 =>
+		if (inst.NNN == 0x0E0) {
+			fmt::printfln("Clear screen")!;
+		} else if (inst.NNN == 0x0EE) {
+			fmt::printfln("Return from subroutine to 0x{:.4X}", state.stack[state.SP - 1])!;
+		} else fmt::printfln("Unkown OP code")!;
+	case 0x01 =>
+		fmt::printfln("Jump to 0x{:.4X}", inst.NNN)!;
+	case 0x02 =>
+		fmt::printfln("Call subroutine at 0x{:.4X}", inst.NNN)!;
+	case 0x03 =>
+		fmt::printfln("Skip the next instruction if V{:X} (0x{:.2X}) == 0x{:.2X}",
+			inst.X, state.V[inst.X], inst.NN)!;
+	case 0x04 =>
+		fmt::printfln("Skip the next instruction if V{:X} (0x{:.2X}) != 0x{:.2X}",
+			inst.X, state.V[inst.X], inst.NN)!;
+	case 0x05 =>
+		fmt::printfln("Skip the next instruction if V{:X} (0x{:.2X}) == V{:X} (0x{:.2X})",
+			inst.X, state.V[inst.X], inst.Y, state.V[inst.Y])!;
+	case 0x06 =>
+		fmt::printfln("V{:X} (0x{:.2X}) = 0x{:.2X}", inst.X, state.V[inst.X], inst.NN)!;
+	case 0x07 =>
+		fmt::printfln("V{:X} (0x{:.2X}) += 0x{:.2X}", inst.X, state.V[inst.X], inst.NN)!;
+	case 0x08 =>
+		switch (inst.N) {
+		case 0x00 =>
+			fmt::printfln("V{:X} (0x{:.2X}) = V{:X} (0x{:.2X})",
+				inst.X, state.V[inst.X], inst.Y, state.V[inst.Y])!;
+		case 0x01 =>
+			fmt::printfln("V{:X} (0x{:.2X}) |= V{:X} (0x{:.2X})",
+				inst.X, state.V[inst.X], inst.Y, state.V[inst.Y])!;
+		case 0x02 =>
+			fmt::printfln("V{:X} (0x{:.2X}) &= V{:X} (0x{:.2X})",
+				inst.X, state.V[inst.X], inst.Y, state.V[inst.Y])!;
+		case 0x03 =>
+			fmt::printfln("V{:X} (0x{:.2X}) ^= V{:X} (0x{:.2X})",
+				inst.X, state.V[inst.X], inst.Y, state.V[inst.Y])!;
+		case 0x04 =>
+			fmt::printfln("V{:X} (0x{:.2X}) += V{:X} (0x{:.2X})",
+				inst.X, state.V[inst.X], inst.Y, state.V[inst.Y])!;
+		case 0x05 =>
+			fmt::printfln("V{:X} (0x{:.2X}) -= V{:X} (0x{:.2X})",
+				inst.X, state.V[inst.X], inst.Y, state.V[inst.Y])!;
+		case 0x06 =>
+			fmt::printfln("V{:X} >>= 1", inst.X)!;
+		case 0x07 =>
+			fmt::printfln("V{:X} = V{:X} (0x{:.2X}) - V{:X} (0x{:.2X})",
+				inst.X, inst.Y, state.V[inst.Y], inst.X, state.V[inst.X])!;
+		case 0x0E =>
+			fmt::printfln("V{:X} <<= 1", inst.X)!;
+		case =>
+			fmt::printfln("Unkown OP code")!;
+		};
+	case 0x09 =>
+		fmt::printfln("Skip the next instruction if V{:X} (0x{:.2X}) != V{:X} (0x{:.2X})",
+			inst.X, state.V[inst.X], inst.Y, state.V[inst.Y])!;
+	case 0x0A =>
+		fmt::printfln("I (0x{:.4X}) = 0x{:.4X}", state.I, inst.NNN)!;
+	case 0x0B =>
+		fmt::printfln("Jump to 0x{:.4X}", state.V[0x00] + inst.NNN)!;
+	case 0x0C =>
+		fmt::printfln("V{:X} (0x{:.2X}) = rand() & 0x{:.2X}",
+			inst.X, state.V[inst.X], inst.NN)!;
+	case 0x0D =>
+		fmt::printfln("Draw 8 pixel wide, {} pixel tall sprite at X = V{:X} and Y = V{:X} ({}, {}), reading from memory location 0x{:.4X} onward",
+			inst.N, inst.X, inst.Y, state.V[inst.X], state.V[inst.Y], state.I)!;
+	case 0x0E =>
+		if (inst.NN == 0x9E) {
+			fmt::printfln("Skip next instruction if the key stored in V{:X} (0x{:X}) is pressed",
+				inst.X, state.V[inst.X] & 0x0F)!;
+		} else if (inst.NN == 0xA1) {
+			fmt::printfln("Skip next instruction if the key stored in V{:X} (0x{:X}) is not pressed",
+				inst.X, state.V[inst.X] & 0x0F)!;
+		} else fmt::printfln("Unkown OP code")!;
+	case 0x0F =>
+		switch (inst.NN) {
+		case 0x07 =>
+			fmt::printfln("V{:X} (0x{:.2X}) = delay timer (0x{:.2X})",
+				inst.X, state.V[inst.X], state.DT)!;
+		case 0x0A =>
+			fmt::printfln("Wait for keypress and store it in V{:X} (0x{:.2X})",
+				inst.X, state.V[inst.X])!;
+		case 0x15 =>
+			fmt::printfln("Set delay timer (0x{:.2X}) to V{:X} (0x{:.2X})",
+				state.DT, inst.X, state.V[inst.X])!;
+		case 0x18 =>
+			fmt::printfln("Set sound timer (0x{:.2X}) to V{:X} (0x{:.2X})",
+				state.ST, inst.X, state.V[inst.X])!;
+		case 0x1E =>
+			fmt::printfln("I += V{:X} (0x{:.2X})", inst.X, state.V[inst.X])!;
+		case 0x29 =>
+			fmt::printfln("I = sprite location for character {:X} (0x{:.4X})",
+				state.V[inst.X] & 0x0F, (state.V[inst.X] & 0x0F) * 5)!;
+		case 0x33 =>
+			fmt::printfln("Stores the BCD representation of V{:X} (0x{:.2X}) with hundreds at 0x{:.4X}, tens at 0x{:.4X} and ones at 0x{:.4X}",
+				inst.X, state.V[inst.X], state.I, state.I + 1, state.I + 2)!;
+		case 0x55 =>
+			fmt::printfln("Stores from V0 to (and including) V{:X} in memory, starting at 0x{:.4X}",
+				inst.X, state.I)!;
+		case 0x65 =>
+			fmt::printfln("Fills from V0 to (and including) V{:X} with values from memory, starting at 0x{:.4X}",
+				inst.X, state.I)!;
+		case =>
+			fmt::printfln("Unkown OP code")!;
+		};
+	case =>
+		fmt::printfln("Unkown OP code")!;
+	};
+};
+
+fn execute_instruction(state: *state, inst: inst, random: *random::random) void = {
+	switch ((inst.op & 0xF000) >> 12) {
+	case 0x00 =>
+		if (inst.NNN == 0x0E0) {
+			state.display[..] = [false...];
+			state.draw = true;
+		} else if (inst.NNN == 0x0EE) {
+			state.SP -= 1;
+			state.PC = state.stack[state.SP];
+		};
+	case 0x01 =>
+		state.PC = inst.NNN;
+	case 0x02 =>
+		state.stack[state.SP] = state.PC;
+		state.SP += 1;
+		state.PC = inst.NNN;
+	case 0x03 =>
+		if (state.V[inst.X] == inst.NN)
+			state.PC += 2;
+	case 0x04 =>
+		if (state.V[inst.X] != inst.NN)
+			state.PC += 2;
+	case 0x05 =>
+		if (state.V[inst.X] == state.V[inst.Y])
+			state.PC += 2;
+	case 0x06 =>
+		state.V[inst.X] = inst.NN;
+	case 0x07 =>
+		state.V[inst.X] += inst.NN;
+	case 0x08 =>
+		switch (inst.N) {
+		case 0x00 =>
+			state.V[inst.X] = state.V[inst.Y];
+		case 0x01 =>
+			state.V[inst.X] |= state.V[inst.Y];
+		case 0x02 =>
+			state.V[inst.X] &= state.V[inst.Y];
+		case 0x03 =>
+			state.V[inst.X] ^= state.V[inst.Y];
+		case 0x04 =>
+			state.V[0x0F] = if (state.V[inst.X] > types::U8_MAX - state.V[inst.Y]) 1 else 0;
+			state.V[inst.X] += state.V[inst.Y];
+		case 0x05 =>
+			state.V[0x0F] = if (state.V[inst.X] >= state.V[inst.Y]) 1 else 0;
+
+			state.V[inst.X] -= state.V[inst.Y];
+		case 0x06 =>
+			state.V[0x0F] = state.V[inst.X] & 0x01;
+			state.V[inst.X] >>= 1;
+		case 0x07 =>
+			state.V[0x0F] = if (state.V[inst.Y] >= state.V[inst.X]) 1 else 0;
+
+			state.V[inst.X] = state.V[inst.Y] - state.V[inst.X];
+		case 0x0E =>
+			state.V[0x0F] = state.V[inst.X] & 0x80;
+			state.V[inst.X] <<= 1;
+		case =>
+			return;
+		};
+	case 0x09 =>
+		if (state.V[inst.X] != state.V[inst.Y])
+			state.PC += 2;
+	case 0x0A =>
+		state.I = inst.NNN;
+	case 0x0B =>
+		state.PC = state.V[0x00] + inst.NNN;
+	case 0x0C =>
+		state.V[inst.X] = (random::next(random) & 255): u8 & inst.NN;
+	case 0x0D =>
+		const rx = state.V[inst.X];
+		const ry = state.V[inst.Y];
+		const sprite_height = inst.N;
+		let sprite_row = 0u8;
+
+		state.V[0x0F] = 0;
+
+		for (let y = 0u8; y < sprite_height; y += 1) {
+			sprite_row = state.mem[state.I + y];
+
+			for (let x = 0u8; x < 8; x += 1) {
+				if ((sprite_row & (0x80 >> x)) != 0) {
+					let pixel = &state.display[((ry + y) * SCREEN_WIDTH + rx + x) % (SCREEN_WIDTH * SCREEN_HEIGHT)];
+
+					if (*pixel)
+						state.V[0x0F] = 1;
+
+					*pixel = !*pixel;
+				};
+			};
+		};
+
+		state.draw = true;
+	case 0x0E =>
+		if (inst.NN == 0x9E) {
+			if (state.keys[state.V[inst.X] & 0x0F])
+				state.PC += 2;
+		} else if (inst.NN == 0xA1) {
+			if (!state.keys[state.V[inst.X] & 0x0F])
+				state.PC += 2;
+		};
+	case 0x0F =>
+		switch (inst.NN) {
+		case 0x07 =>
+			state.V[inst.X] = state.DT;
+		case 0x0A =>
+			let any_pressed = false;
+			let key: u8 = 0xFF;
+
+			for (let i = 0z; key == 0xFF && i < len(state.keys); i += 1)
+				if (state.keys[i]) {
+					any_pressed = true;
+					key = i: u8;
+					break;
+				};
+
+			if (!any_pressed) state.PC -= 2
+			else {
+				if (state.keys[key])
+					state.PC -= 2
+				else {
+					state.V[inst.X] = key;
+					key = 0xFF;
+					any_pressed = false;
+				};
+			};
+		case 0x15 =>
+			state.DT = state.V[inst.X];
+		case 0x18 =>
+			state.ST = state.V[inst.X];
+		case 0x1E =>
+			state.I += state.V[inst.X];
+		case 0x29 =>
+			state.I = (state.V[inst.X] & 0x0F) * 5;
+		case 0x33 =>
+			let BCD = state.V[inst.X];
+			state.mem[state.I + 2] = BCD % 10;
+			BCD /= 10;
+			state.mem[state.I + 1] = BCD % 10;
+			BCD /= 10;
+			state.mem[state.I] = BCD;
+		case 0x55 =>
+			for (let i = 0u8; i <= inst.X; i += 1) {
+				state.mem[state.I] = state.V[i];
+				state.I += 1;
+			};
+		case 0x65 =>
+			for (let i = 0u8; i <= inst.X; i += 1) {
+				state.V[i] = state.mem[state.I];
+				state.I += 1;
+			};
+		case =>
+			return;
+		};
+	case =>
+		return;
+	};
+};
+
+fn tick_timers(state: *state) void = {
+	if (state.DT > 0)
+		state.DT -= 1;
+
+	if (state.ST > 0) {
+		// BEEP
+
+		state.ST -= 1;
+	};
+};
+
+fn tick(state: *state, random: *random::random, debug: bool) void = {
+	let op_hi = state.mem[state.PC]: u16;
+	let op_lo = state.mem[state.PC + 1]: u16;
+	let op = (op_hi << 8) | op_lo;
+	state.PC += 2;
+
+	if (debug)
+		print_instruction(state, instruction(op));
+
+	execute_instruction(state, instruction(op), random);
+};
+
+fn update_screen(state: *state, renderer: *sdl2::SDL_Renderer) (void | sdl2::error) = {
+	let rect = sdl2::SDL_Rect {
+		x = 0,
+		y = 0,
+		w = SCALE,
+		h = SCALE
+	};
+
+	for (let i = 0z; i < len(state.display); i += 1) {
+		rect.x = (i % SCREEN_WIDTH): int * SCALE;
+		rect.y = (i / SCREEN_WIDTH): int * SCALE;
+
+		if (state.display[i]) {
+			sdl2::SDL_SetRenderDrawColor(renderer, 0xFE, 0xFE, 0xFE, 0xFF)?;
+			sdl2::SDL_RenderFillRect(renderer, &rect)?;
+
+			sdl2::SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0xFF)?;
+			sdl2::SDL_RenderDrawRect(renderer, &rect)?;
+		} else {
+			sdl2::SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0xFF)?;
+			sdl2::SDL_RenderFillRect(renderer, &rect)?;
+		};
+	};
+
+	sdl2::SDL_RenderPresent(renderer);
+};
+
+fn run() (void | fs::error | io::error | sdl2::error) = {
+	if (len(os::args) < 2) {
+		fmt::fatalf("Usage: {} <rom>", os::args[0]);
+	};
+
+	let debug = os::getenv("CHIP8_DEBUG") is str;
+
+	const chip8 = chip8();
+	let seed = time::now(time::clock::REALTIME).nsec: u64;
+	let random = random::init(seed);
+
+	const rom = os::open(os::args[1])?;
+	defer io::close(rom)!;
+
+	io::read(rom, chip8.mem[START_ADDR..])?;
+
+	sdl2::SDL_Init(sdl2::SDL_INIT_VIDEO | sdl2::SDL_INIT_AUDIO)?;
+	defer sdl2::SDL_Quit();
+
+	let window = sdl2::SDL_CreateWindow("CHIP-8", sdl2::SDL_WINDOWPOS_CENTERED, sdl2::SDL_WINDOWPOS_CENTERED, SCREEN_WIDTH: int * SCALE, SCREEN_HEIGHT: int * SCALE, sdl2::SDL_WindowFlags::SHOWN)?;
+	defer sdl2::SDL_DestroyWindow(window);
+
+	let renderer = sdl2::SDL_CreateRenderer(window, -1, sdl2::SDL_RendererFlags::ACCELERATED)?;
+	defer sdl2::SDL_DestroyRenderer(renderer);
+
+	sdl2::SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0xFF)?;
+	sdl2::SDL_RenderClear(renderer)?;
+
+	let quit = false;
+	for (!quit) {
+		let event = sdl2::event { ... };
+		for (sdl2::SDL_PollEvent(&event)? == 1)
+			switch (event.event_type) {
+			case sdl2::SDL_EventType::QUIT =>
+				quit = true;
+			case sdl2::SDL_EventType::KEYDOWN =>
+				switch (event.key.keysym.scancode) {
+				case sdl2::SDL_Scancode::ESCAPE =>
+					quit = true;
+				case sdl2::SDL_Scancode::TWO =>
+					chip8.keys[0x1] = true;
+				case sdl2::SDL_Scancode::THREE =>
+					chip8.keys[0x2] = true;
+				case sdl2::SDL_Scancode::FOUR =>
+					chip8.keys[0x3] = true;
+				case sdl2::SDL_Scancode::FIVE =>
+					chip8.keys[0xC] = true;
+				case sdl2::SDL_Scancode::W =>
+					chip8.keys[0x4] = true;
+				case sdl2::SDL_Scancode::E =>
+					chip8.keys[0x5] = true;
+				case sdl2::SDL_Scancode::R =>
+					chip8.keys[0x6] = true;
+				case sdl2::SDL_Scancode::T =>
+					chip8.keys[0xD] = true;
+				case sdl2::SDL_Scancode::S =>
+					chip8.keys[0x7] = true;
+				case sdl2::SDL_Scancode::D =>
+					chip8.keys[0x8] = true;
+				case sdl2::SDL_Scancode::F =>
+					chip8.keys[0x9] = true;
+				case sdl2::SDL_Scancode::G =>
+					chip8.keys[0xE] = true;
+				case sdl2::SDL_Scancode::X =>
+					chip8.keys[0xA] = true;
+				case sdl2::SDL_Scancode::C =>
+					chip8.keys[0x0] = true;
+				case sdl2::SDL_Scancode::V =>
+					chip8.keys[0xB] = true;
+				case sdl2::SDL_Scancode::B =>
+					chip8.keys[0xF] = true;
+				case =>
+					void;
+				};
+			case sdl2::SDL_EventType::KEYUP =>
+				switch (event.key.keysym.scancode) {
+				case sdl2::SDL_Scancode::ESCAPE =>
+					quit = true;
+				case sdl2::SDL_Scancode::TWO =>
+					chip8.keys[0x1] = false;
+				case sdl2::SDL_Scancode::THREE =>
+					chip8.keys[0x2] = false;
+				case sdl2::SDL_Scancode::FOUR =>
+					chip8.keys[0x3] = false;
+				case sdl2::SDL_Scancode::FIVE =>
+					chip8.keys[0xC] = false;
+				case sdl2::SDL_Scancode::W =>
+					chip8.keys[0x4] = false;
+				case sdl2::SDL_Scancode::E =>
+					chip8.keys[0x5] = false;
+				case sdl2::SDL_Scancode::R =>
+					chip8.keys[0x6] = false;
+				case sdl2::SDL_Scancode::T =>
+					chip8.keys[0xD] = false;
+				case sdl2::SDL_Scancode::S =>
+					chip8.keys[0x7] = false;
+				case sdl2::SDL_Scancode::D =>
+					chip8.keys[0x8] = false;
+				case sdl2::SDL_Scancode::F =>
+					chip8.keys[0x9] = false;
+				case sdl2::SDL_Scancode::G =>
+					chip8.keys[0xE] = false;
+				case sdl2::SDL_Scancode::X =>
+					chip8.keys[0xA] = false;
+				case sdl2::SDL_Scancode::C =>
+					chip8.keys[0x0] = false;
+				case sdl2::SDL_Scancode::V =>
+					chip8.keys[0xB] = false;
+				case sdl2::SDL_Scancode::B =>
+					chip8.keys[0xF] = false;
+				case =>
+					void;
+				};
+			case => void;
+			};
+
+		const frame_start = sdl2::SDL_GetPerformanceCounter();
+
+		for (let i = 0; i < CLOCKSPEED / 60; i += 1) {
+			tick(&chip8, &random, debug);
+
+			if ((chip8.mem[chip8.PC - 2] >> 4) == 0x0D)
+				break;
+		};
+
+		const frame_end = sdl2::SDL_GetPerformanceCounter();
+
+		const time_elapsed = ((frame_end - frame_start) * 1000): f64 / sdl2::SDL_GetPerformanceFrequency(): f64;
+
+		sdl2::SDL_Delay(if (16.67 > time_elapsed) (16.67 - time_elapsed): u32 else 0);
+
+		if (chip8.draw) {
+			update_screen(&chip8, renderer)?;
+			chip8.draw = false;
+		};
+
+		tick_timers(&chip8);
+	};
+};
+
+export fn main() void = {
+	match (run()) {
+	case let err: fs::error =>
+		fmt::fatal("FS error: ", fs::strerror(err));
+	case let err: io::error =>
+		fmt::fatal("I/O error: ", io::strerror(err));
+	case let err: sdl2::error =>
+		fmt::fatal("SDL error: ", sdl2::strerror(err));
+	case void =>
+		return;
+	};
+};