Update memory mapping
This commit is contained in:
Locria Cyber
parent
a39ba72202
commit
97d8d71020
10
src/main.zig
10
src/main.zig
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@ -12,14 +12,14 @@ const smiley = [8]u8{
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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.m.colors._0 = ._1;
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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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const gamepad = w4.m.gamepads[0];
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if (gamepad.x) {
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w4.m.colors._0 = ._3;
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}
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w4.blit(&smiley, 76, 76, 8, 8, w4.BLIT_1BPP);
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w4.blit(&smiley, 76, 76, 8, 8, .{});
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w4.text("Press X to blink", 16, 90);
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}
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144
src/wasm4.zig
144
src/wasm4.zig
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@ -1,6 +1,18 @@
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//
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// WASM-4: https://wasm4.org/docs
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const std = @import("std");
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fn assert_equal(a: anytype, b: anytype, comptime error_msg: []const u8) void {
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if (a != b) @compileError(std.fmt.comptimePrint("{} != {} {s}", .{a, b, error_msg}));
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}
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comptime {
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const builtin = @import("builtin");
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const native_endian = builtin.target.cpu.arch.endian();
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assert_equal(native_endian, .Little, "Bit flags need little endian");
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}
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// ┌───────────────────────────────────────────────────────────────────────────┐
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// │ │
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// │ Platform Constants │
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@ -15,31 +27,70 @@ pub const SCREEN_SIZE: u32 = 160;
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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 Memory = packed struct {
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_padding: [4]u8,
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palette: [4]Color,
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colors: DrawColors,
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gamepads: [4]GamePad,
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mouse: Mouse,
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system: SystemFlags,
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_reserved: [128]u8,
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framebuffer: [6400]u8,
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userdata: [58976]u8,
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};
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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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comptime {
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assert_equal(@bitSizeOf(Memory), 64 * 1024 * 8, "Memory layout wrong");
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}
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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 m = @intToPtr(*allowzero Memory, 0);
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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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pub const Color = packed struct {
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blue : u8,
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green : u8,
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red : u8,
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_reserved: u8 = 0,
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};
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pub const DrawColors = packed struct {
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_0: ColorIndex,
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_1: ColorIndex,
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_2: ColorIndex,
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_3: ColorIndex,
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};
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pub const ColorIndex = enum(u4) {
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transparent = 0,
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_0 = 1,
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_1 = 2,
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_2 = 3,
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_3 = 4,
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};
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pub const GamePad = packed struct {
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x: bool,
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z: bool,
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_reserved: u2,
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left: bool,
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right: bool,
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up: bool,
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down: bool,
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};
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pub const Mouse = packed struct {
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x: i16,
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y: i16,
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_0: bool, // primary button
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_1: bool, // secondary button
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_2: bool, // third button
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_reserved: u5,
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};
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pub const SystemFlags = packed struct {
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preserve_framebuffer: bool,
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hide_gamepad_overlay: bool,
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_reserved: u6,
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};
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// ┌───────────────────────────────────────────────────────────────────────────┐
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// │ │
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@ -47,38 +98,49 @@ pub const SYSTEM_HIDE_GAMEPAD_OVERLAY: u8 = 2;
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// │ │
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// └───────────────────────────────────────────────────────────────────────────┘
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pub const BlitFlags = packed struct {
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_2bpp: bool = false,
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flip_x: bool = false,
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flip_y: bool = false,
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rotate: bool = false,
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_reserved: u28 = 0,
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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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pub fn blit(sprite: [*]const u8, x: u32, y: u32, width: u32, height: u32, flags: BlitFlags) void {
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raw_api.blit(sprite, x, y, width, height, @bitCast(u32, flags));
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}
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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 fn blitSub(sprite: [*]const u8, x: u32, y: u32, width: u32, height: u32, src_x: u32, src_y: u32, stride: u32, flags: BlitFlags) void {
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raw_api.blitSub(sprite, x, y, width, height, src_x, src_y, stride, @bitCast(u32, flags));
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}
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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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const raw_api = struct {
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extern fn blit(sprite: [*]const u8, x: u32, y: u32, width: u32, height: u32, flags: u32) void;
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extern fn blitSub(sprite: [*]const u8, x: u32, y: u32, width: u32, height: u32, src_x: u32, src_y: u32, stride: u32, flags: u32) void;
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};
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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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pub extern fn line(x1: u32, y1: u32, x2: u32, y2: u32) 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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pub extern fn oval(x: u32, y: u32, width: u32, height: u32) 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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pub extern fn rect(x: u32, y: u32, 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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pub fn text(str: []const u8, x: u32, y: u32) 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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extern fn textUtf8(strPtr: [*]const u8, strLen: usize, x: u32, y: u32) 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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pub extern fn vline(x: u32, y: u32, 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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pub extern fn hline(x: u32, y: u32, len: u32) void;
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// ┌───────────────────────────────────────────────────────────────────────────┐
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// │ │
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@ -123,13 +185,3 @@ 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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