diff options
Diffstat (limited to 'src/main.zig')
| -rw-r--r-- | src/main.zig | 69 |
1 files changed, 55 insertions, 14 deletions
diff --git a/src/main.zig b/src/main.zig index 20202d0..f13cada 100644 --- a/src/main.zig +++ b/src/main.zig @@ -45,56 +45,94 @@ const Chip8 = struct { }; print("{s}\n", .{buf}); + var length: u32 = 0; for (buf) |char, index| { if (index == chars_read) { break; } - print("{}: {}\n", .{ index, char }); + //print("{}: {x}\n", .{ index, char }); self.*.memory[index + 512] = char; + length += 1; } + length = (length + 514) / 2; + var iter: u32 = 510 / 2; + while (iter < length) { + defer iter += 1; + print("{}, {}: {x:0>4}\n", .{ iter * 2, iter * 2 + 1, @intCast(u16, self.*.memory[iter * 2]) << 8 | self.*.memory[iter * 2 + 1] }); + } + print("\n\n", .{}); } pub fn emulate_cycles(self: *Chip8, cycles: u32) void { var i: u32 = cycles; while (i > 0) : (i -= 1) { - //print("{}\n", .{i}); // Fetch Opcode self.*.opcode = @intCast(u16, self.*.memory[self.*.pc]) << 8 | self.*.memory[self.*.pc + 1]; // Decode Opcode // Execute Opcode switch (self.*.opcode & 0xF000) { 0x0000 => { // 00E0: Clear Screen + print("{x:0>4} - Clear Screen\n", .{self.*.opcode}); self.*.gfx = [_]bool{false} ** (64 * 32); self.*.pc += 2; - }, - 0xA000 => { // ANNN: Set I to adress NNN - self.*.I = self.*.opcode & 0x0FFF; - self.*.pc += 2; + print("\n", .{}); }, 0x1000 => { // 1NNN: Jump to NNN + print("{x:0>4} - Jump to 1NNN\n", .{self.*.opcode}); //self.*.stack[self.*.sp] = self.*.pc; - self.*.pc = self.*.opcode & 0x0FFF; + self.*.pc = @intCast(u12, self.*.opcode & 0x0FFF); + print("\n", .{}); }, 0x6000 => { // 6XNN: Set VX to NN - self.*.V[@intCast(u8, self.*.opcode & 0x0F00 >> 8)] = @intCast(u8, self.*.opcode & 0x00FF); + print("{x:0>4} - Set VX to 6XNN\n", .{self.*.opcode}); + self.*.V[(self.*.opcode & 0x0F00) >> 8] = @intCast(u8, self.*.opcode & 0x00FF); + print("set V{x:0>4} to {x:0>4}\n", .{ (self.*.opcode & 0x0F00) >> 8, @intCast(u8, self.*.opcode & 0x00FF) }); self.*.pc += 2; + print("\n", .{}); }, 0x7000 => { // 7XNN: Add NN to VX (dont change carry flag) - self.*.V[@intCast(u8, self.*.opcode & 0x0F00 >> 8)] += @intCast(u8, self.*.opcode & 0x00FF); + print("{x:0>4} - Add 7XNN to VX\n", .{self.*.opcode}); + self.*.V[(self.*.opcode & 0x0F00) >> 8] += @intCast(u8, self.*.opcode & 0x00FF); + self.*.pc += 2; + print("\n", .{}); + }, + 0xA000 => { // ANNN: Set I to adress NNN + print("{x:0>4} - Set I to ANNN\n", .{self.*.opcode}); + self.*.I = self.*.opcode & 0x0FFF; + print("Wrote {x:0>4} to I\n", .{self.*.opcode & 0x0FFF}); + print("Check: {x:0>4}\n", .{self.*.I}); self.*.pc += 2; + print("\n", .{}); }, 0xD000 => { // DXYN: Draw a sprite - const x: u16 = self.*.V[@intCast(u16, self.*.opcode & 0x0F00 >> 8)]; - const y: u16 = self.*.V[@intCast(u16, self.*.opcode & 0x00F0 >> 4)]; - const height: u16 = @intCast(u16, self.*.opcode & 0x000F); + print("{x:0>4} - Draw Sprite DXYN\n", .{self.*.opcode}); + const x: u16 = self.*.V[(self.*.opcode & 0x0F00) >> 8]; + const y: u16 = self.*.V[(self.*.opcode & 0x00F0) >> 4]; + const height: u16 = self.*.opcode & 0x000F; var pixel: u16 = undefined; + print("Opcode x:{x:0>4}\n", .{(self.*.opcode & 0x0F00)}); + print("Opcode y:{x:0>4}\n", .{(self.*.opcode & 0x00F0)}); + print("Vx:{x:0>4}\n", .{((self.*.opcode & 0x0F00) >> 8)}); + print("Vy:{x:0>4}\n", .{((self.*.opcode & 0x00F0) >> 4)}); + + //print("x: {x}\ny: {x}\n\n", .{ x, y }); + //print("x: {x}\ny: {x}\n\n", .{ + // @intCast(u16, self.*.opcode & 0x0F00 >> 8), + // @intCast(u16, self.*.opcode & 0x00F0 >> 4), + //}); + //for (self.*.V) |v| { + //print("{x} ", .{v}); + //} + //print("\n", .{}); self.*.V[0xF] = 0; var yline: u32 = 0; - while (yline < height) : (yline += 1) { + while (yline < height) { + defer yline += 1; pixel = self.*.memory[self.*.I + yline]; var xline: u32 = 0; - while (xline < 8) : (xline += 1) { + while (xline < 8) { + defer xline += 1; //while (times(&eight)) |width| { if ((pixel & (@intCast(u32, 0x80) >> @intCast(u5, xline))) != 0) { if (self.*.gfx[(x + xline + ((y + yline) * 64))] == true) { @@ -105,9 +143,12 @@ const Chip8 = struct { } } self.*.pc += 2; + print("\n", .{}); }, else => { // opcode not found + print("{x:0>4} - OPCODE NOT FOUND\n", .{self.*.opcode}); + print("\n", .{}); }, } // Update timers |