Initial commit
Louis Pearson
commit
1d430e81f7
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/zig-cache
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/zig-out
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const std = @import("std");
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// Returns true if the version includes https://github.com/ziglang/zig/pull/10572/commits.
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// When this is false, trying to place the stack first will result in data corruption.
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fn version_supports_stack_first(zig_version: std.SemanticVersion) !bool {
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if (zig_version.order(try std.SemanticVersion.parse("0.10.0")).compare(.gte)) {
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// Merged here: https://github.com/ziglang/zig/pull/10572
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return true;
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}
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if (zig_version.major == 0 and zig_version.minor == 10) {
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// Check for 0.10.0-dev.258+. Conservatively check the prefix of the tag
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// in case zig uses other prefixes that don't respect semver ordering.
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if (zig_version.pre) |pre| {
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// Merged here: https://github.com/ziglang/zig/pull/10572
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return std.mem.startsWith(u8, pre, "dev.") and zig_version.order(try std.SemanticVersion.parse("0.10.0-dev.258")).compare(.gte);
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}
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}
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// Backported here: https://github.com/ziglang/zig/commit/6f49233ac6a6569b909b689f22fc260dc8c19234
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return zig_version.order(try std.SemanticVersion.parse("0.9.1")).compare(.gte);
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}
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test "stack version check" {
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const expect = std.testing.expect;
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const parse = std.SemanticVersion.parse;
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try expect(!try version_supports_stack_first(try parse("0.8.0")));
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try expect(!try version_supports_stack_first(try parse("0.9.0")));
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try expect(!try version_supports_stack_first(try parse("0.9.1-dev.259")));
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try expect(try version_supports_stack_first(try parse("0.9.1")));
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// Conservatively don't recognize tags other than 'dev'.
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try expect(!try version_supports_stack_first(try parse("0.10.0-aev.259")));
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try expect(!try version_supports_stack_first(try parse("0.10.0-zev.259")));
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try expect(!try version_supports_stack_first(try parse("0.10.0-dev.257")));
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try expect(try version_supports_stack_first(try parse("0.10.0-dev.258")));
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try expect(try version_supports_stack_first(try parse("0.10.0-dev.259")));
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try expect(try version_supports_stack_first(try parse("0.10.0")));
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try expect(try version_supports_stack_first(try parse("0.10.1-dev.100")));
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try expect(try version_supports_stack_first(try parse("0.10.1-dev.300")));
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try expect(try version_supports_stack_first(try parse("0.10.1")));
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try expect(try version_supports_stack_first(try parse("1.0.0")));
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}
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pub fn build(b: *std.build.Builder) !void {
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const zig_version = @import("builtin").zig_version;
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const mode = b.standardReleaseOptions();
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const lib = b.addSharedLibrary("cart", "src/main.zig", .unversioned);
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lib.setBuildMode(mode);
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lib.setTarget(.{ .cpu_arch = .wasm32, .os_tag = .freestanding });
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lib.import_memory = true;
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lib.initial_memory = 65536;
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lib.max_memory = 65536;
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if (try version_supports_stack_first(zig_version)) {
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lib.stack_size = 14752;
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} else {
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// `--stack-first` option have been reenabled on wasm targets with https://github.com/ziglang/zig/pull/10572
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std.log.warn("Update to Zig >=0.9.1 (or >=0.10.0-dev.258 for nightly) to detect stack overflows at runtime.", .{});
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lib.global_base = 6560;
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lib.stack_size = 8192;
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}
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// Workaround https://github.com/ziglang/zig/issues/2910, preventing
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// functions from compiler_rt getting incorrectly marked as exported, which
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// prevents them from being removed even if unused.
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lib.export_symbol_names = &[_][]const u8{ "start", "update" };
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lib.install();
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}
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const w4 = @import("wasm4.zig");
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const smiley = [8]u8{
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0b11000011,
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0b10000001,
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0b00100100,
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0b00100100,
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0b00000000,
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0b00100100,
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0b10011001,
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0b11000011,
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};
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export fn update() void {
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w4.DRAW_COLORS.* = 2;
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w4.text("Hello from Zig!", 10, 10);
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const gamepad = w4.GAMEPAD1.*;
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if (gamepad & w4.BUTTON_1 != 0) {
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w4.DRAW_COLORS.* = 4;
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}
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w4.blit(&smiley, 76, 76, 8, 8, w4.BLIT_1BPP);
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w4.text("Press X to blink", 16, 90);
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}
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//
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// WASM-4: https://wasm4.org/docs
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// ┌───────────────────────────────────────────────────────────────────────────┐
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// │ │
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// │ Platform Constants │
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// │ │
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// └───────────────────────────────────────────────────────────────────────────┘
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pub const CANVAS_SIZE: u32 = 160;
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// ┌───────────────────────────────────────────────────────────────────────────┐
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// │ │
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// │ Memory Addresses │
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// │ │
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// └───────────────────────────────────────────────────────────────────────────┘
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pub const PALETTE: *[4]u32 = @intToPtr(*[4]u32, 0x04);
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pub const DRAW_COLORS: *u16 = @intToPtr(*u16, 0x14);
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pub const GAMEPAD1: *const u8 = @intToPtr(*const u8, 0x16);
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pub const GAMEPAD2: *const u8 = @intToPtr(*const u8, 0x17);
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pub const GAMEPAD3: *const u8 = @intToPtr(*const u8, 0x18);
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pub const GAMEPAD4: *const u8 = @intToPtr(*const u8, 0x19);
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pub const MOUSE_X: *const i16 = @intToPtr(*const i16, 0x1a);
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pub const MOUSE_Y: *const i16 = @intToPtr(*const i16, 0x1c);
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pub const MOUSE_BUTTONS: *const u8 = @intToPtr(*const u8, 0x1e);
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pub const SYSTEM_FLAGS: *u8 = @intToPtr(*u8, 0x1f);
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pub const FRAMEBUFFER: *[6400]u8 = @intToPtr(*[6400]u8, 0xA0);
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pub const BUTTON_1: u8 = 1;
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pub const BUTTON_2: u8 = 2;
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pub const BUTTON_LEFT: u8 = 16;
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pub const BUTTON_RIGHT: u8 = 32;
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pub const BUTTON_UP: u8 = 64;
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pub const BUTTON_DOWN: u8 = 128;
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pub const MOUSE_LEFT: u8 = 1;
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pub const MOUSE_RIGHT: u8 = 2;
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pub const MOUSE_MIDDLE: u8 = 4;
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pub const SYSTEM_PRESERVE_FRAMEBUFFER: u8 = 1;
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pub const SYSTEM_HIDE_GAMEPAD_OVERLAY: u8 = 2;
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// ┌───────────────────────────────────────────────────────────────────────────┐
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// │ │
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// │ Drawing Functions │
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// │ │
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// └───────────────────────────────────────────────────────────────────────────┘
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/// Copies pixels to the framebuffer.
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pub extern fn blit(sprite: [*]const u8, x: i32, y: i32, width: i32, height: i32, flags: u32) void;
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/// Copies a subregion within a larger sprite atlas to the framebuffer.
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pub extern fn blitSub(sprite: [*]const u8, x: i32, y: i32, width: i32, height: i32, src_x: u32, src_y: u32, stride: i32, flags: u32) void;
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pub const BLIT_2BPP: u32 = 1;
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pub const BLIT_1BPP: u32 = 0;
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pub const BLIT_FLIP_X: u32 = 2;
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pub const BLIT_FLIP_Y: u32 = 4;
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pub const BLIT_ROTATE: u32 = 8;
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/// Draws a line between two points.
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pub extern fn line(x1: i32, y1: i32, x2: i32, y2: i32) void;
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/// Draws an oval (or circle).
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pub extern fn oval(x: i32, y: i32, width: i32, height: i32) void;
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/// Draws a rectangle.
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pub extern fn rect(x: i32, y: i32, width: u32, height: u32) void;
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/// Draws text using the built-in system font.
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pub fn text(str: []const u8, x: i32, y: i32) void {
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textUtf8(str.ptr, str.len, x, y);
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}
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extern fn textUtf8(strPtr: [*]const u8, strLen: usize, x: i32, y: i32) void;
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/// Draws a vertical line
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pub extern fn vline(x: i32, y: i32, len: u32) void;
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/// Draws a horizontal line
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pub extern fn hline(x: i32, y: i32, len: u32) void;
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// ┌───────────────────────────────────────────────────────────────────────────┐
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// │ │
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// │ Sound Functions │
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// │ │
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// └───────────────────────────────────────────────────────────────────────────┘
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/// Plays a sound tone.
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pub extern fn tone(frequency: u32, duration: u32, volume: u32, flags: u32) void;
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pub const TONE_PULSE1: u32 = 0;
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pub const TONE_PULSE2: u32 = 1;
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pub const TONE_TRIANGLE: u32 = 2;
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pub const TONE_NOISE: u32 = 3;
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pub const TONE_MODE1: u32 = 0;
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pub const TONE_MODE2: u32 = 4;
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pub const TONE_MODE3: u32 = 8;
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pub const TONE_MODE4: u32 = 12;
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// ┌───────────────────────────────────────────────────────────────────────────┐
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// │ │
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// │ Storage Functions │
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// │ │
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// └───────────────────────────────────────────────────────────────────────────┘
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/// Reads up to `size` bytes from persistent storage into the pointer `dest`.
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pub extern fn diskr(dest: [*]u8, size: u32) u32;
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/// Writes up to `size` bytes from the pointer `src` into persistent storage.
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pub extern fn diskw(src: [*]const u8, size: u32) u32;
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// ┌───────────────────────────────────────────────────────────────────────────┐
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// │ │
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// │ Other Functions │
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// │ │
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// └───────────────────────────────────────────────────────────────────────────┘
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/// Prints a message to the debug console.
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pub fn trace(x: []const u8) void {
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traceUtf8(x.ptr, x.len);
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}
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extern fn traceUtf8(strPtr: [*]const u8, strLen: usize) void;
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/// Use with caution, as there's no compile-time type checking.
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///
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/// * %c, %d, and %x expect 32-bit integers.
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/// * %f expects 64-bit floats.
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/// * %s expects a *zero-terminated* string pointer.
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///
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/// See https://github.com/aduros/wasm4/issues/244 for discussion and type-safe
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/// alternatives.
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pub extern fn tracef(x: [*:0]const u8, ...) void;
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