feat: initial commit

some basic ROMs already boot (ARM946E-S only), working on Armwrestler
and Rockwrestler next so I can ensure CPU compatability for but ARMv5TE
and ARMv4T

src/ui/imgui.zig

@@ -0,0 +1,40 @@
+const std = @import("std");
+const zgui = @import("zgui");
+
+const platform = @import("../platform.zig");
+
+const Arm946es = @import("../core/nds9.zig").Arm946es;
+const Dimensions = platform.Dimensions;
+
+const nds_height = @import("../core/ppu.zig").screen_height;
+const nds_width = @import("../core/ppu.zig").screen_width;
+
+const GLuint = c_uint;
+
+pub const State = struct {
+    const default_rom_title: [12:0]u8 = "No Title\x00\x00\x00\x00".*;
+
+    title: [12:0]u8 = default_rom_title,
+    dim: Dimensions = .{ .width = 1280, .height = 720 },
+};
+
+pub fn draw(state: *const State, top_tex: GLuint, btm_tex: GLuint, arm946es: *Arm946es) bool {
+    _ = arm946es;
+    zgui.backend.newFrame(@floatFromInt(state.dim.width), @floatFromInt(state.dim.height));
+
+    {
+        const w: f32 = @floatFromInt((nds_width * 3) / 2);
+        const h: f32 = @floatFromInt((nds_height * 3) / 2);
+
+        const provided = std.mem.sliceTo(&state.title, 0);
+        const window_title = if (provided.len == 0) &State.default_rom_title else provided;
+
+        _ = zgui.begin(window_title, .{ .flags = .{ .no_resize = true, .always_auto_resize = true } });
+        defer zgui.end();
+
+        zgui.image(@ptrFromInt(top_tex), .{ .w = w, .h = h, .uv0 = .{ 0, 1 }, .uv1 = .{ 1, 0 } });
+        zgui.image(@ptrFromInt(btm_tex), .{ .w = w, .h = h, .uv0 = .{ 0, 1 }, .uv1 = .{ 1, 0 } });
+    }
+
+    return true;
+}