55 lines
1.2 KiB
Zig
55 lines
1.2 KiB
Zig
const DISPLAY_WIDTH: usize = 64;
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const DISPLAY_HEIGHT: usize = 32;
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const std = @import("std");
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pub const Point = struct {
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x: u16,
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y: u16,
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};
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pub const Display = struct {
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buf: [DISPLAY_HEIGHT * DISPLAY_WIDTH]u8,
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pub fn new() Display {
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return .{
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.buf = [_]u8{0x00} ** (DISPLAY_HEIGHT * DISPLAY_WIDTH)
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};
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}
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};
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pub fn clear(disp: *Display) void {
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disp.buf = u8[DISPLAY_WIDTH * DISPLAY_HEIGHT]{0x00};
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}
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pub fn draw_sprite(disp: *Display, pos: *const Point, data: *const []u8) bool {
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var set_vf: bool = false;
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for (data.*) |byte, y_offset| {
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var offset_count: u8 = 0;
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while (offset_count < 8) : (offset_count += 1) {
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const x_bit_offset = @intCast(u3, offset_count);
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const x = @intCast(u8, pos.x + (7 - x_bit_offset));
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const y = @intCast(u8, pos.y + y_offset);
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const temp = (byte >> x_bit_offset) & 0x01;
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const bit = @intCast(u1, temp);
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const i = DISPLAY_WIDTH * y + x;
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if (i >= disp.buf.len) break;
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if (bit == 0x1 and disp.buf[i] == 0x01) {
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set_vf = true;
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}
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disp.buf[i] ^= bit;
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}
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}
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return set_vf;
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} |