include all ROMs into final binary at comptime

.gitignore

@@ -1,2 +1,3 @@
 zig-cache
 zig-out
+*.blend1

build-models.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+cd src/assets/models
+blender emulator.blend --background --python export_obj.py

build.zig

@@ -32,6 +32,24 @@ pub fn build(b: *std.Build) !void {
 
     const exe = b.addExecutable(.{ .name = "chip8-zig", .root_source_file = .{ .path = "src/main.zig" }, .optimize = optimize, .target = target });
 
+    // Provide filenames of all files in 'src/ROMs' to program as options
+    {
+        var files = std.ArrayList([]const u8).init(b.allocator);
+        defer files.deinit();
+        var options = b.addOptions();
+        var dir = try std.fs.cwd().openIterableDir("src/ROMs", .{ });
+        var it = dir.iterate();
+        while (try it.next()) |file| {
+            if (file.kind != .file) {
+                continue;
+            }
+            try files.append(b.pathJoin(&.{"ROMs", file.name}));
+        }
+
+        options.addOption([]const []const u8, "roms", files.items);
+        exe.addOptions("options", options);
+    }
+
     raylib.addTo(b, exe, target, optimize);
 
     // rl.link(b, exe, target, optimize);

src/assets/models/emulator.mtl

@@ -1,5 +1,5 @@
-# Blender 3.5.1 MTL File: 'emulator.blend'
+# Blender MTL File: 'emulator.blend'
-# www.blender.org
+# Material Count: 4
 
 newmtl Behind_buttons
 Ns 0.000000
@@ -14,15 +14,16 @@ illum 2
 newmtl Button
 Ns 250.000000
 Ka 1.000000 1.000000 1.000000
+Kd 0.003095 0.002616 0.002869
 Ks 0.500000 0.500000 0.500000
 Ke 0.000000 0.000000 0.000000
 Ni 1.450000
 d 1.000000
 illum 2
-map_Kd Buttons texture.png
+map_Kd /home/rokas/code/fun/chip8-zig/src/assets/models/Buttons texture.png
 
 newmtl Case
-Ns 298.057037
+Ns 298.057005
 Ka 1.000000 1.000000 1.000000
 Kd 0.057402 0.087001 0.228570
 Ks 0.500000 0.500000 0.500000
@@ -40,3 +41,4 @@ Ke 0.000000 0.000000 0.000000
 Ni 1.450000
 d 1.000000
 illum 2
+map_Kd /home/rokas/code/fun/chip8-zig/src/assets/models/screen-texture.png

src/assets/models/export_obj.py

@@ -0,0 +1,8 @@
+import bpy
+
+bpy.ops.export_scene.obj(
+    filepath="emulator.obj",
+    use_triangles=True,
+    use_materials=True,
+    use_normals=True,
+)

src/chip.zig

@@ -4,7 +4,7 @@ const Allocator = std.mem.Allocator;
 
 const Errors = error { UnknownInstruction };
 
-allocator: *const Allocator,
+allocator: Allocator,
 
 display: []bool,
 display_width: u8,
@@ -43,7 +43,7 @@ fn get_inst_n(inst: u16) u4 {
     return @truncate(inst & 0x000F);
 }
 
-pub fn init(allocator: *const Allocator) !Self {
+pub fn init(allocator: Allocator) !Self {
     const seed_bits: u128 = @bitCast(std.time.nanoTimestamp());
     const seed: u64 = @truncate(seed_bits);
 

src/global-context.zig

@@ -0,0 +1,19 @@
+const Self = @This();
+const rl = @import("raylib");
+
+camera: rl.Camera3D,
+
+pub fn init() Self {
+    var camera = rl.Camera3D{
+        .position = rl.Vector3.new(0, 0, -10),
+        .target = rl.Vector3.new(0.0, 0.0, 0.0),
+        .up = rl.Vector3.new(0.0, 1.0, 0.0),
+        .fovy = 45.0,
+        .projection = rl.CameraProjection.CAMERA_PERSPECTIVE,
+    };
+
+    return Self {
+        .camera = camera
+    };
+}
+

src/main-scene.zig

@@ -0,0 +1,413 @@
+const Self = @This();
+const rl = @import("raylib");
+const std = @import("std");
+const MemoryView = @import("memory-view.zig").MemoryView;
+const Range = @import("memory-view.zig").Range;
+const UI = @import("ui.zig").UI;
+const GlobalContext = @import("./global-context.zig");
+
+const ChipContext = @import("chip.zig");
+const RaylibChip = @import("raylib-chip.zig");
+
+const assert = std.debug.assert;
+const Allocator = std.mem.Allocator;
+
+const Tab = enum {
+    MemoryView
+};
+
+var edit_mode = false;
+var tab = Tab.MemoryView;
+
+ctx: *GlobalContext,
+allocator: Allocator,
+
+model: rl.Model,
+model_bbox: rl.BoundingBox,
+model_position: rl.Vector3,
+
+camera_turn_vel: rl.Vector3 = rl.Vector3{ .x = 0, .y = 0, .z = 0 },
+camera_target_orientation: ?rl.Vector3 = null,
+previous_click_time: f64 = 0.0,
+
+shader: rl.Shader,
+light: Light,
+
+chip: *ChipContext,
+raylib_chip: RaylibChip,
+chip_sound: rl.Sound,
+
+screen_texture: rl.RenderTexture2D,
+
+pub fn gen_sin_wave(wave: *rl.Wave, frequency: f32) void {
+    assert(wave.sampleSize == 16); // Only 16 bits are supported
+
+    const sample_rate: f32 = @floatFromInt(wave.sampleRate);
+    const sample_size: u5 = @truncate(wave.sampleSize);
+    const max_sample_value: f32 = @floatFromInt(@shlExact(@as(u32, 1), sample_size - 1));
+
+    const data: [*]i16 = @ptrCast(@alignCast(wave.data));
+    for (0..wave.frameCount) |i| {
+        const i_f32: f32 = @floatFromInt(i);
+        const sin_value: f32 = @sin(std.math.pi*2*frequency/sample_rate*i_f32);
+        data[i] = @intFromFloat(sin_value*max_sample_value);
+    }
+}
+
+const Light = struct {
+    const LightType = enum(i32) {
+        DIRECTIONAL = 0,
+        POINT = 1,
+    };
+
+    type: LightType,
+    enabled: bool,
+    position: rl.Vector3,
+    target: rl.Vector3,
+    color: rl.Color,
+    attenuation: f32 = 0.0,
+
+    enabledLoc: i32,
+    typeLoc: i32,
+    positionLoc: i32,
+    targetLoc: i32,
+    colorLoc: i32,
+    attenuationLoc: i32 = 0,
+
+    fn create(light_type: LightType, postion: rl.Vector3, target: rl.Vector3, color: rl.Color, shader: rl.Shader) Light {
+        var light = Light{
+            .type = light_type,
+            .enabled = true,
+            .position = postion,
+            .target = target,
+            .color = color,
+            .enabledLoc = rl.GetShaderLocation(shader, "lights[0].enabled"),
+            .typeLoc = rl.GetShaderLocation(shader, "lights[0].type"),
+            .positionLoc = rl.GetShaderLocation(shader, "lights[0].position"),
+            .targetLoc = rl.GetShaderLocation(shader, "lights[0].target"),
+            .colorLoc = rl.GetShaderLocation(shader, "lights[0].color"),
+        };
+        light.update_values(shader);
+        return light;
+    }
+
+    fn update_values(light: *Light, shader: rl.Shader) void {
+        const enabled: i32 = @intFromBool(light.enabled);
+        rl.SetShaderValue(shader, light.enabledLoc, &enabled, rl.ShaderUniformDataType.SHADER_UNIFORM_INT);
+
+        const lightType: i32 = @intFromEnum(light.type);
+        rl.SetShaderValue(shader, light.typeLoc, &lightType, rl.ShaderUniformDataType.SHADER_UNIFORM_INT);
+
+        const position = [3]f32{ light.position.x, light.position.y, light.position.z };
+        rl.SetShaderValue(shader, light.positionLoc, &position, rl.ShaderUniformDataType.SHADER_UNIFORM_VEC3);
+
+        const target = [3]f32{ light.target.x, light.target.y, light.target.z };
+        rl.SetShaderValue(shader, light.targetLoc, &target, rl.ShaderUniformDataType.SHADER_UNIFORM_VEC3);
+
+        const color = [4]f32{
+            @as(f32, @floatFromInt(light.color.r)) / 255.0,
+            @as(f32, @floatFromInt(light.color.g)) / 255.0,
+            @as(f32, @floatFromInt(light.color.b)) / 255.0,
+            @as(f32, @floatFromInt(light.color.a)) / 255.0,
+        };
+        rl.SetShaderValue(shader, light.colorLoc, &color, rl.ShaderUniformDataType.SHADER_UNIFORM_VEC4);
+    }
+};
+
+fn get_camera_projection(camera: *const rl.Camera3D) rl.Matrix {
+    const screen_width: f32 = @floatFromInt(rl.GetScreenWidth());
+    const screen_height: f32 = @floatFromInt(rl.GetScreenHeight());
+
+    if (camera.projection == .CAMERA_PERSPECTIVE) {
+        return rl.MatrixPerspective(camera.fovy*rl.DEG2RAD, screen_width/screen_height, rl.RL_CULL_DISTANCE_NEAR, rl.RL_CULL_DISTANCE_FAR);
+    } else if (camera.projection == .CAMERA_ORTHOGRAPHIC) {
+        const aspect = screen_width/screen_height;
+        const top = camera.fovy/2.0;
+        const right = top*aspect;
+
+        return rl.MatrixOrtho(-right, right, -top, top, rl.RL_CULL_DISTANCE_NEAR, rl.RL_CULL_DISTANCE_FAR);
+    } else {
+        unreachable;
+    }
+}
+
+fn get_screen_direction_from_camera(mat_proj: *const rl.Matrix, mat_view: *const rl.Matrix, point: rl.Vector2) rl.Vector3 {
+    const screen_width: f32 = @floatFromInt(rl.GetScreenWidth());
+    const screen_height: f32 = @floatFromInt(rl.GetScreenHeight());
+
+    const ndc_x = (2.0*point.x) / screen_width - 1.0;
+    const ndc_y = 1.0 - (2.0*point.y) / screen_height;
+
+    var near_point = rl.Vector3Unproject(.{ .x = ndc_x, .y = ndc_y, .z = 0.0 }, mat_proj.*, mat_view.*);
+    var far_point  = rl.Vector3Unproject(.{ .x = ndc_x, .y = ndc_y, .z = 1.0 }, mat_proj.*, mat_view.*);
+
+    return rl.Vector3Subtract(far_point, near_point).normalize();
+}
+
+fn get_preffered_distance_to_box(camera: *const rl.Camera3D, box: rl.BoundingBox) f32 {
+    const screen_width: f32 = @floatFromInt(rl.GetScreenWidth());
+    const screen_height: f32 = @floatFromInt(rl.GetScreenHeight());
+    const margin = @min(screen_width, screen_height)*0.1;
+
+    const box_size = box.max.sub(box.min);
+
+    const max_model_scale = @min((screen_width-2*margin)/box_size.x, (screen_height-2*margin)/box_size.y);
+    // const model_screen_width = box_size.x * max_model_scale;
+    const model_screen_height = box_size.y * max_model_scale;
+
+    const mat_proj = get_camera_projection(camera);
+    const mat_view = rl.MatrixIdentity(); // rl.MatrixLookAt(camera.position, camera.target, camera.up);
+
+    const screen_middle = rl.Vector2{ .x = screen_width/2, .y = screen_height/2 };
+    const box_top_middle = screen_middle.add(.{ .y = -model_screen_height/2 });
+
+    const middle_dir = get_screen_direction_from_camera(&mat_proj, &mat_view, screen_middle);
+    const top_middle_dir = get_screen_direction_from_camera(&mat_proj, &mat_view, box_top_middle);
+    const angle = top_middle_dir.angleBetween(middle_dir);
+    const distance = 1/@tan(angle) * (box_size.y/2) + box_size.z/4;
+    return distance;
+}
+
+pub fn init(allocator: Allocator, ctx: *GlobalContext) !Self {
+    // var temp_mem = [1]u8{0xAA} ** (16*80 + 10);
+    // var memory_view = MemoryView.init(&temp_mem, &font, 32);
+    // var memory_view = MemoryView.init(chip.memory, &font, font_size, &allocator);
+    // var selected_memory = Range{};
+    // var ui = UI.init();
+
+    var model = rl.LoadModel("src/assets/models/emulator.obj");
+    var model_bbox = rl.GetModelBoundingBox(model);
+
+    var model_position = rl.Vector3{ };
+
+    const shader = rl.LoadShader("src/shaders/main.vs", "src/shaders/main.fs");
+    shader.locs.?[@intFromEnum(rl.ShaderLocationIndex.SHADER_LOC_VECTOR_VIEW)] = rl.GetShaderLocation(shader, "viewPos");
+
+    const ambientLoc = rl.GetShaderLocation(shader, "ambient");
+    rl.SetShaderValue(shader, ambientLoc, &[4]f32{ 0.2, 0.2, 0.2, 1.0 }, .SHADER_UNIFORM_VEC4);
+
+    var light = Light.create(.DIRECTIONAL, rl.Vector3.new(0.2, 0, -0.2), rl.Vector3.zero(), rl.WHITE, shader);
+
+    for (0..@intCast(model.materialCount)) |i| {
+        model.materials.?[i].shader = shader;
+    }
+
+    var chip = try allocator.create(ChipContext);
+    chip.* = try ChipContext.init(allocator);
+
+    const sample_rate = 44100;
+    var data = try allocator.alloc(i16, sample_rate);
+    defer allocator.free(data);
+    var chip_wave = rl.Wave{
+        .frameCount = sample_rate,
+        .sampleRate = sample_rate,
+        .sampleSize = 16,
+        .channels = 1,
+        .data = @ptrCast(data.ptr),
+    };
+
+    gen_sin_wave(&chip_wave, 440);
+    var chip_sound = rl.LoadSoundFromWave(chip_wave);
+    rl.SetSoundVolume(chip_sound, 0.2);
+    var raylib_chip = RaylibChip.init(chip, chip_sound);
+
+    var screen_texture = rl.LoadRenderTexture(chip.display_width, chip.display_height);
+
+    // TODO: Don't use the fourth material, use name of material to get its index. Or some other more reliable method
+    rl.SetMaterialTexture(@ptrCast(&model.materials.?[3]), rl.MATERIAL_MAP_DIFFUSE, screen_texture.texture);
+
+    var self = Self {
+        .allocator = allocator,
+        .ctx = ctx,
+        .model = model,
+        .model_bbox = model_bbox,
+        .model_position = model_position,
+        .shader = shader,
+        .light = light,
+
+        .chip = chip,
+        .raylib_chip = raylib_chip,
+        .chip_sound = chip_sound,
+
+        .screen_texture = screen_texture,
+    };
+
+    return self;
+}
+
+pub fn deinit(self: *Self) void {
+    rl.UnloadRenderTexture(self.screen_texture);
+    rl.UnloadSound(self.chip_sound);
+    self.chip.deinit();
+    self.allocator.destroy(self.chip);
+}
+
+fn update_camera(self: *Self, dt: f32) void {
+    const mouse_delta = rl.GetMouseDelta();
+    const camera = &self.ctx.camera;
+
+    if (rl.IsWindowResized()) {
+        const distance = get_preffered_distance_to_box(camera, self.model_bbox);
+        const direction = camera.position.sub(self.model_position).normalize();
+        camera.position = self.model_position.add(direction.scale(distance));
+    }
+
+    if (rl.Vector3Equals(camera.position, rl.Vector3Zero()) == 1) {
+        const distance = get_preffered_distance_to_box(camera, self.model_bbox);
+        camera.target = self.model_position;
+        camera.position = self.model_position.sub(rl.Vector3.new(0, 0, 1).scale(distance));
+    }
+
+    var camera_turn_acc = rl.Vector3Zero();
+    if (rl.IsMouseButtonDown(rl.MouseButton.MOUSE_BUTTON_LEFT)) {
+        if (@fabs(mouse_delta.x) > 5) {
+            const rotation_speed = 2; // Radians/second
+            camera_turn_acc.x = -rotation_speed*mouse_delta.x;
+        }
+        if (@fabs(mouse_delta.x) < 5) {
+            self.camera_turn_vel = self.camera_turn_vel.scale(0.90); // Holding drag
+        }
+    }
+
+    if (rl.IsMouseButtonPressed(rl.MouseButton.MOUSE_BUTTON_LEFT)) {
+        self.camera_target_orientation = null;
+
+        const now = rl.GetTime();
+        const duration_between_clicks = now - self.previous_click_time;
+        if (duration_between_clicks < 0.3) {
+            const ray = rl.GetMouseRay(rl.GetMousePosition(), camera.*);
+            const collision = rl.GetRayCollisionBox(ray, self.model_bbox);
+            if (collision.hit) {
+                const front_face_normal = rl.Vector3.new(0, 0, -1);
+                const back_face_normal = rl.Vector3.new(0, 0, 1);
+                if (rl.Vector3Equals(collision.normal, front_face_normal) == 1) {
+                    self.camera_target_orientation = front_face_normal;
+                } else if (rl.Vector3Equals(collision.normal, back_face_normal) == 1) {
+                    self.camera_target_orientation = back_face_normal;
+                }
+            }
+        }
+        self.previous_click_time = now;
+    }
+
+    if (self.camera_target_orientation) |target| {
+        const current_direction = camera.position.sub(self.model_position).normalize();
+        const current_angle = std.math.atan2(f32, current_direction.z, current_direction.x);
+        const target_angle = std.math.atan2(f32, target.z, target.x);
+        const diff_angle = std.math.pi - @mod((target_angle - current_angle) + 3*std.math.pi, 2*std.math.pi);
+        if (@fabs(diff_angle) < 0.001) {
+            self.camera_turn_vel.x = 0;
+            self.camera_target_orientation = null;
+        } else {
+            self.camera_turn_vel.x = diff_angle*3;
+        }
+    }
+
+    self.camera_turn_vel = self.camera_turn_vel.scale(0.95); // Ambient drag
+    self.camera_turn_vel = self.camera_turn_vel.add(camera_turn_acc.scale(dt));
+
+    const camera_min_vel = 0;
+    if (self.camera_turn_vel.length() > camera_min_vel) {
+        const rotation = rl.MatrixRotate(camera.up.normalize(), self.camera_turn_vel.x*dt);
+        var view = rl.Vector3Subtract(camera.position, camera.target);
+        view = rl.Vector3Transform(view, rotation);
+        camera.position = rl.Vector3Add(camera.target, view);
+    }
+}
+
+pub fn update(self: *Self, dt: f32) void {
+    if (rl.IsKeyPressed(rl.KeyboardKey.KEY_TAB)) {
+        edit_mode = !edit_mode;
+    }
+
+    if (edit_mode) {
+        if (rl.IsKeyPressed(rl.KeyboardKey.KEY_ONE)) {
+            tab = .MemoryView;
+        }
+    }
+
+    self.update_camera(dt);
+
+    const camera = &self.ctx.camera;
+    const cameraPos = [3]f32{ camera.position.x, camera.position.y, camera.position.z };
+    rl.SetShaderValue(self.shader, self.shader.locs.?[@intFromEnum(rl.ShaderLocationIndex.SHADER_LOC_VECTOR_VIEW)], &cameraPos, rl.ShaderUniformDataType.SHADER_UNIFORM_VEC3);
+    self.light.update_values(self.shader);
+
+    rl.BeginTextureMode(self.screen_texture);
+        self.raylib_chip.render();
+    rl.EndTextureMode();
+
+    // {
+    //     var matProj = rl.MatrixIdentity();
+    //     // projection = CAMERA_PERSPECTIVE
+    //     matProj = rl.MatrixPerspective(camera.fovy*rl.DEG2RAD, (screen_width/screen_height), rl.RL_CULL_DISTANCE_NEAR, rl.RL_CULL_DISTANCE_FAR);
+    //
+    //     var matView = rl.MatrixLookAt(camera.position, camera.target, camera.up);
+    //     // Convert world position vector to quaternion
+    //     var worldPos = rl.Vector4{ .x = position.x, .y = position.y, .z = position.z, .w = 1.0 };
+    //
+    //     std.debug.print("worldPos {}\n", .{worldPos});
+    //     // Transform world position to view
+    //     worldPos = rl.QuaternionTransform(worldPos, matView);
+    //
+    //     // Transform result to projection (clip space position)
+    //     worldPos = rl.QuaternionTransform(worldPos, matProj);
+    //
+    //     // Calculate normalized device coordinates (inverted y)
+    //     var ndcPos = rl.Vector3.new( worldPos.x/worldPos.w, -worldPos.y/worldPos.w, worldPos.z/worldPos.w );
+    //
+    //     // Calculate 2d screen position vector
+    //     screen_position = rl.Vector2{ .x = (ndcPos.x + 1.0)/2.0*screen_width, .y = (ndcPos.y + 1.0)/2.0*screen_height };
+    // }
+
+    // const target_screen_position = rl.Vector2{ .x = screen_width/2, .y = screen_height*0.1 };
+    // {
+    //     var matProj = get_camera_projection(&camera);
+    //     var matView = rl.MatrixLookAt(camera.position, camera.target, camera.up);
+    //
+    //     const ndc_x = (2.0*target_screen_position.x) / screen_width - 1.0;
+    //     const ndc_y = 1.0 - (2.0*target_screen_position.y) / screen_height;
+    //
+    //     var near_point = rl.Vector3Unproject(.{ .x = ndc_x, .y = ndc_y, .z = 0.0 }, matProj, matView);
+    //     var far_point  = rl.Vector3Unproject(.{ .x = ndc_x, .y = ndc_y, .z = 1.0 }, matProj, matView);
+    //
+    //     var direction = rl.Vector3Subtract(far_point, near_point).normalize();
+    //
+    //     var origin: rl.Vector3 = undefined;
+    //     if (camera.projection == .CAMERA_PERSPECTIVE) {
+    //         origin = camera.position;
+    //     } else {
+    //         origin = rl.Vector3Unproject(.{ .x = ndc_x, .y = ndc_y, .z = -1.0 }, matProj, matView);
+    //     }
+    //
+    //     var world_pos = origin.add(direction.scale(3));
+    //
+    //     model_position = world_pos;
+    // }
+}
+
+pub fn draw(self: *Self) void {
+    rl.DrawModel(self.model, self.model_position, 1.0, rl.WHITE);
+    // rl.DrawMesh(self.screen_mesh, self.screen_material, self.screen_transform);
+
+    // if (!edit_mode) {
+    //     rl.ClearBackground(rl.DARKGRAY);
+    //
+    //     const scale_x = @divFloor(screen_width, chip.display_width);
+    //     const scale_y = @divFloor(screen_height, chip.display_height);
+    //     const min_scale = @min(scale_x, scale_y);
+    //
+    //     const display_width = chip.display_width * min_scale;
+    //     const display_height = chip.display_height * min_scale;
+    //     const display_x = @divFloor(screen_width - display_width, 2);
+    //     const display_y = @divFloor(screen_height - display_height, 2);
+    //     raylib_chip.render(display_x, display_y, display_width, display_height);
+    // } else {
+    //     rl.ClearBackground(rl.RAYWHITE);
+    //     ui.update();
+    //
+    //     if (tab == .MemoryView) {
+    //         try memory_view.show(&ui, 0, 0, @floatFromInt(screen_width), @floatFromInt(screen_height), &selected_memory);
+    //     }
+    // }
+}

src/main.zig

@@ -5,169 +5,26 @@ const print = std.debug.print;
 const Allocator = std.mem.Allocator;
 const ChipContext = @import("chip.zig");
 const RaylibChip = @import("raylib-chip.zig");
-const UI = @import("ui.zig").UI;
+const GlobalContext = @import("./global-context.zig");
-
+const MainScene = @import("./main-scene.zig");
-const MemoryView = @import("memory-view.zig").MemoryView;
+const options = @import("options");
-const Range = @import("memory-view.zig").Range;
-
-const assert = std.debug.assert;
-
-const Tab = enum {
-    MemoryView
-};
-
-pub fn gen_sin_wave(wave: *rl.Wave, frequency: f32) void {
-    assert(wave.sampleSize == 16); // Only 16 bits are supported
-
-    const sample_rate: f32 = @floatFromInt(wave.sampleRate);
-    const sample_size: u5 = @truncate(wave.sampleSize);
-    const max_sample_value: f32 = @floatFromInt(@shlExact(@as(u32, 1), sample_size - 1));
-
-    const data: [*]i16 = @ptrCast(@alignCast(wave.data));
-    for (0..wave.frameCount) |i| {
-        const i_f32: f32 = @floatFromInt(i);
-        const sin_value: f32 = @sin(std.math.pi*2*frequency/sample_rate*i_f32);
-        data[i] = @intFromFloat(sin_value*max_sample_value);
-    }
-}
 
 fn megabytes(amount: usize) usize {
     return amount * 1024 * 1024;
 }
 
-const Light = struct {
+const ROM = struct {
-    const LightType = enum(i32) {
+    name: []const u8,
-        DIRECTIONAL = 0,
+    data: []const u8,
-        POINT = 1,
-    };
-
-    type: LightType,
-    enabled: bool,
-    position: rl.Vector3,
-    target: rl.Vector3,
-    color: rl.Color,
-    attenuation: f32 = 0.0,
-
-    enabledLoc: i32,
-    typeLoc: i32,
-    positionLoc: i32,
-    targetLoc: i32,
-    colorLoc: i32,
-    attenuationLoc: i32 = 0,
-
-    fn create(light_type: LightType, postion: rl.Vector3, target: rl.Vector3, color: rl.Color, shader: rl.Shader) Light {
-        var light = Light{
-            .type = light_type,
-            .enabled = true,
-            .position = postion,
-            .target = target,
-            .color = color,
-            .enabledLoc = rl.GetShaderLocation(shader, "lights[0].enabled"),
-            .typeLoc = rl.GetShaderLocation(shader, "lights[0].type"),
-            .positionLoc = rl.GetShaderLocation(shader, "lights[0].position"),
-            .targetLoc = rl.GetShaderLocation(shader, "lights[0].target"),
-            .colorLoc = rl.GetShaderLocation(shader, "lights[0].color"),
-        };
-        light.update_values(shader);
-        return light;
-    }
-
-    fn update_values(light: *Light, shader: rl.Shader) void {
-        const enabled: i32 = @intFromBool(light.enabled);
-        rl.SetShaderValue(shader, light.enabledLoc, &enabled, rl.ShaderUniformDataType.SHADER_UNIFORM_INT);
-
-        const lightType: i32 = @intFromEnum(light.type);
-        rl.SetShaderValue(shader, light.typeLoc, &lightType, rl.ShaderUniformDataType.SHADER_UNIFORM_INT);
-
-        const position = [3]f32{ light.position.x, light.position.y, light.position.z };
-        rl.SetShaderValue(shader, light.positionLoc, &position, rl.ShaderUniformDataType.SHADER_UNIFORM_VEC3);
-
-        const target = [3]f32{ light.target.x, light.target.y, light.target.z };
-        rl.SetShaderValue(shader, light.targetLoc, &target, rl.ShaderUniformDataType.SHADER_UNIFORM_VEC3);
-
-        const color = [4]f32{
-            @as(f32, @floatFromInt(light.color.r)) / 255.0,
-            @as(f32, @floatFromInt(light.color.g)) / 255.0,
-            @as(f32, @floatFromInt(light.color.b)) / 255.0,
-            @as(f32, @floatFromInt(light.color.a)) / 255.0,
-        };
-        rl.SetShaderValue(shader, light.colorLoc, &color, rl.ShaderUniformDataType.SHADER_UNIFORM_VEC4);
-    }
 };
 
-fn get_camera_projection(camera: *const rl.Camera3D) rl.Matrix {
-    const screen_width: f32 = @floatFromInt(rl.GetScreenWidth());
-    const screen_height: f32 = @floatFromInt(rl.GetScreenHeight());
-
-    if (camera.projection == .CAMERA_PERSPECTIVE) {
-        return rl.MatrixPerspective(camera.fovy*rl.DEG2RAD, screen_width/screen_height, rl.RL_CULL_DISTANCE_NEAR, rl.RL_CULL_DISTANCE_FAR);
-    } else if (camera.projection == .CAMERA_ORTHOGRAPHIC) {
-        const aspect = screen_width/screen_height;
-        const top = camera.fovy/2.0;
-        const right = top*aspect;
-
-        return rl.MatrixOrtho(-right, right, -top, top, rl.RL_CULL_DISTANCE_NEAR, rl.RL_CULL_DISTANCE_FAR);
-    } else {
-        unreachable;
-    }
-}
-
-fn get_screen_direction_from_camera(mat_proj: *const rl.Matrix, mat_view: *const rl.Matrix, point: rl.Vector2) rl.Vector3 {
-    const screen_width: f32 = @floatFromInt(rl.GetScreenWidth());
-    const screen_height: f32 = @floatFromInt(rl.GetScreenHeight());
-
-    const ndc_x = (2.0*point.x) / screen_width - 1.0;
-    const ndc_y = 1.0 - (2.0*point.y) / screen_height;
-
-    var near_point = rl.Vector3Unproject(.{ .x = ndc_x, .y = ndc_y, .z = 0.0 }, mat_proj.*, mat_view.*);
-    var far_point  = rl.Vector3Unproject(.{ .x = ndc_x, .y = ndc_y, .z = 1.0 }, mat_proj.*, mat_view.*);
-
-    return rl.Vector3Subtract(far_point, near_point).normalize();
-}
-
-fn get_preffered_distance_to_box(camera: *const rl.Camera3D, box: rl.BoundingBox) f32 {
-    const screen_width: f32 = @floatFromInt(rl.GetScreenWidth());
-    const screen_height: f32 = @floatFromInt(rl.GetScreenHeight());
-    const margin = @min(screen_width, screen_height)*0.1;
-
-    const box_size = box.max.sub(box.min);
-
-    const max_model_scale = @min((screen_width-2*margin)/box_size.x, (screen_height-2*margin)/box_size.y);
-    // const model_screen_width = box_size.x * max_model_scale;
-    const model_screen_height = box_size.y * max_model_scale;
-
-    const mat_proj = get_camera_projection(camera);
-    const mat_view = rl.MatrixIdentity(); // rl.MatrixLookAt(camera.position, camera.target, camera.up);
-
-    const screen_middle = rl.Vector2{ .x = screen_width/2, .y = screen_height/2 };
-    const box_top_middle = screen_middle.add(.{ .y = -model_screen_height/2 });
-
-    const middle_dir = get_screen_direction_from_camera(&mat_proj, &mat_view, screen_middle);
-    const top_middle_dir = get_screen_direction_from_camera(&mat_proj, &mat_view, box_top_middle);
-    const angle = top_middle_dir.angleBetween(middle_dir);
-    const distance = 1/@tan(angle) * (box_size.y/2) + box_size.z/4;
-    return distance;
-}
-
 pub fn main() anyerror!void {
-    var program_memory = try std.heap.page_allocator.alloc(u8, megabytes(2));
+    const memory = try std.heap.page_allocator.alloc(u8, megabytes(5));
-    var fba = std.heap.FixedBufferAllocator.init(program_memory);
+    var fba = std.heap.FixedBufferAllocator.init(memory);
     const allocator = fba.allocator();
 
-    var chip = try ChipContext.init(&allocator);
-    defer chip.deinit();
-
-    chip.set_memory(0x200, @embedFile("ROMs/br8kout.ch8"));
-    // const file = try std.fs.cwd().openFile("ROMs/morse_demo.ch8", .{ .mode = .read_only });
-    // defer file.close();
-    // try chip.set_memory_from_file(0x200, file);
-
-    const pixel_size = 20;
-    const initial_screen_width: i32 = @as(i32, chip.display_width) * pixel_size;
-    const initial_screen_height: i32 = @as(i32, chip.display_height) * pixel_size;
-
     rl.SetConfigFlags(rl.ConfigFlags{ .FLAG_WINDOW_RESIZABLE = true });
-    rl.InitWindow(initial_screen_width, initial_screen_height, "CHIP-8");
+    rl.InitWindow(1024, 720, "CHIP-8");
     defer rl.CloseWindow();
 
     rl.InitAudioDevice();
@@ -175,243 +32,45 @@ pub fn main() anyerror!void {
 
     rl.SetTargetFPS(60);
 
+    var ctx = GlobalContext.init();
+    var main_scene = try MainScene.init(allocator, &ctx);
+    defer main_scene.deinit();
+
+    comptime var roms = [1]ROM{ undefined } ** options.roms.len;
+    comptime {
+        var i = 0;
+        for (options.roms) |file| {
+            roms[i] = ROM{
+                .name = file,
+                .data = @embedFile(file)
+            };
+            i += 1;
+        }
+    }
+
+    main_scene.chip.set_memory(0x200, roms[3].data);
+
     const font_size = 24;
     const font_ttf_default_numchars = 95; // TTF font generation default charset: 95 glyphs (ASCII 32..126)
-    const font = rl.LoadFontEx("src/fonts/generic-mono.otf", font_size, null, font_ttf_default_numchars);
+    const font = rl.LoadFontEx("src/assets/fonts/generic-mono.otf", font_size, null, font_ttf_default_numchars);
     defer rl.UnloadFont(font);
 
-    const sample_rate = 44100;
-    var data = try allocator.alloc(i16, sample_rate);
-    defer allocator.free(data);
-    var chip_wave = rl.Wave{
-        .frameCount = sample_rate,
-        .sampleRate = sample_rate,
-        .sampleSize = 16,
-        .channels = 1,
-        .data = @ptrCast(data.ptr),
-    };
-    gen_sin_wave(&chip_wave, 440);
-    var chip_sound = rl.LoadSoundFromWave(chip_wave);
-    defer rl.UnloadSound(chip_sound);
-    rl.SetSoundVolume(chip_sound, 0.2);
-
-    var raylib_chip = RaylibChip.init(&chip, &chip_sound);
-    // var raylib_chip = RaylibChip.init(&chip, null);
-    raylib_chip.tick_speed = 500;
-    raylib_chip.timer_speed = 60;
-
-    var edit_mode = false;
-    var tab: Tab = .MemoryView;
-
-    // var temp_mem = [1]u8{0xAA} ** (16*80 + 10);
-    // var memory_view = MemoryView.init(&temp_mem, &font, 32);
-    // var memory_view = MemoryView.init(chip.memory, &font, font_size, &allocator);
-    // var selected_memory = Range{};
-    // var ui = UI.init();
-
-    var camera = rl.Camera3D{
-        .position = rl.Vector3.new(0.0, 0, 0.0),
-        .target = rl.Vector3.new(0.0, 0.0, 0.0),
-        .up = rl.Vector3.new(0.0, 1.0, 0.0),
-        .fovy = 45.0,
-        .projection = rl.CameraProjection.CAMERA_PERSPECTIVE,
-    };
-
-    var model = rl.LoadModel("src/assets/models/emulator.obj");
-    var model_bbox = rl.GetModelBoundingBox(model);
-
-    var model_position = rl.Vector3{ };
-    var model_size = model_bbox.max.sub(model_bbox.min);
-
-    const shader = rl.LoadShader("src/shaders/lighting.vs", "src/shaders/lighting.fs");
-    shader.locs.?[@intFromEnum(rl.ShaderLocationIndex.SHADER_LOC_VECTOR_VIEW)] = rl.GetShaderLocation(shader, "viewPos");
-    const ambientLoc = rl.GetShaderLocation(shader, "ambient");
-    rl.SetShaderValue(shader, ambientLoc, &[4]f32{ 0.2, 0.2, 0.2, 1.0 }, rl.ShaderUniformDataType.SHADER_UNIFORM_VEC4);
-
-    for (0..@intCast(model.materialCount)) |i| {
-        model.materials.?[i].shader = shader;
-    }
-
-    var light = Light.create(Light.LightType.DIRECTIONAL, rl.Vector3.new(0.2, 0, -0.2), rl.Vector3.zero(), rl.WHITE, shader);
-
-    std.debug.print("dimensions {}", .{model_size});
-
-    var camera_turn_vel = rl.Vector3Zero();
-    var camera_target_orientation: ?rl.Vector3 = null;
-    var previous_click_time: f64 = 0.0;
-
-    // rl.DisableCursor();
     while (!rl.WindowShouldClose()) {
         var dt = rl.GetFrameTime();
-        raylib_chip.update(dt);
+        main_scene.raylib_chip.update_input();
+        main_scene.raylib_chip.update(dt);
 
-        if (rl.IsKeyPressed(rl.KeyboardKey.KEY_TAB)) {
+        main_scene.update(dt);
-            edit_mode = !edit_mode;
-        }
-
-        if (edit_mode) {
-            if (rl.IsKeyPressed(rl.KeyboardKey.KEY_ONE)) {
-                tab = .MemoryView;
-            }
-        }
-
-        const mouse_delta = rl.GetMouseDelta();
-
-        if (rl.IsWindowResized()) {
-            const distance = get_preffered_distance_to_box(&camera, model_bbox);
-            const direction = camera.position.sub(model_position).normalize();
-            camera.position = model_position.add(direction.scale(distance));
-        }
-
-        if (rl.Vector3Equals(camera.position, rl.Vector3Zero()) == 1) {
-            const distance = get_preffered_distance_to_box(&camera, model_bbox);
-            camera.target = model_position;
-            camera.position = model_position.sub(rl.Vector3.new(0, 0, 1).scale(distance));
-        }
-
-        var camera_turn_acc = rl.Vector3Zero();
-        if (rl.IsMouseButtonDown(rl.MouseButton.MOUSE_BUTTON_LEFT)) {
-            if (@fabs(mouse_delta.x) > 5) {
-                const rotation_speed = 2; // Radians/second
-                camera_turn_acc.x = -rotation_speed*mouse_delta.x;
-            }
-            if (@fabs(mouse_delta.x) < 5) {
-                camera_turn_vel = camera_turn_vel.scale(0.90); // Holding drag
-            }
-        }
-
-        if (rl.IsMouseButtonPressed(rl.MouseButton.MOUSE_BUTTON_LEFT)) {
-            camera_target_orientation = null;
-
-            const now = rl.GetTime();
-            const duration_between_clicks = now - previous_click_time;
-            if (duration_between_clicks < 0.3) {
-                const ray = rl.GetMouseRay(rl.GetMousePosition(), camera);
-                const collision = rl.GetRayCollisionBox(ray, model_bbox);
-                if (collision.hit) {
-                    const front_face_normal = rl.Vector3.new(0, 0, -1);
-                    const back_face_normal = rl.Vector3.new(0, 0, 1);
-                    if (rl.Vector3Equals(collision.normal, front_face_normal) == 1) {
-                        camera_target_orientation = front_face_normal;
-                    } else if (rl.Vector3Equals(collision.normal, back_face_normal) == 1) {
-                        camera_target_orientation = back_face_normal;
-                    }
-                }
-            }
-            previous_click_time = now;
-        }
-
-        if (camera_target_orientation) |target| {
-            const current_direction = camera.position.sub(model_position).normalize();
-            const current_angle = std.math.atan2(f32, current_direction.z, current_direction.x);
-            const target_angle = std.math.atan2(f32, target.z, target.x);
-            const diff_angle = std.math.pi - @mod((target_angle - current_angle) + 3*std.math.pi, 2*std.math.pi);
-            if (@fabs(diff_angle) < 0.001) {
-                camera_turn_vel.x = 0;
-                camera_target_orientation = null;
-            } else {
-                camera_turn_vel.x = diff_angle*3;
-            }
-        }
-
-        camera_turn_vel = camera_turn_vel.scale(0.95); // Ambient drag
-        camera_turn_vel = camera_turn_vel.add(camera_turn_acc.scale(dt));
-
-        const camera_min_vel = 0;
-        if (camera_turn_vel.length() > camera_min_vel) {
-            const rotation = rl.MatrixRotate(camera.up.normalize(), camera_turn_vel.x*dt);
-            var view = rl.Vector3Subtract(camera.position, camera.target);
-            view = rl.Vector3Transform(view, rotation);
-            camera.position = rl.Vector3Add(camera.target, view);
-        }
-
-        // {
-        //     var matProj = rl.MatrixIdentity();
-        //     // projection = CAMERA_PERSPECTIVE
-        //     matProj = rl.MatrixPerspective(camera.fovy*rl.DEG2RAD, (screen_width/screen_height), rl.RL_CULL_DISTANCE_NEAR, rl.RL_CULL_DISTANCE_FAR);
-        //
-        //     var matView = rl.MatrixLookAt(camera.position, camera.target, camera.up);
-        //     // Convert world position vector to quaternion
-        //     var worldPos = rl.Vector4{ .x = position.x, .y = position.y, .z = position.z, .w = 1.0 };
-        //
-        //     std.debug.print("worldPos {}\n", .{worldPos});
-        //     // Transform world position to view
-        //     worldPos = rl.QuaternionTransform(worldPos, matView);
-        //
-        //     // Transform result to projection (clip space position)
-        //     worldPos = rl.QuaternionTransform(worldPos, matProj);
-        //
-        //     // Calculate normalized device coordinates (inverted y)
-        //     var ndcPos = rl.Vector3.new( worldPos.x/worldPos.w, -worldPos.y/worldPos.w, worldPos.z/worldPos.w );
-        //
-        //     // Calculate 2d screen position vector
-        //     screen_position = rl.Vector2{ .x = (ndcPos.x + 1.0)/2.0*screen_width, .y = (ndcPos.y + 1.0)/2.0*screen_height };
-        // }
-
-        // const target_screen_position = rl.Vector2{ .x = screen_width/2, .y = screen_height*0.1 };
-        // {
-        //     var matProj = get_camera_projection(&camera);
-        //     var matView = rl.MatrixLookAt(camera.position, camera.target, camera.up);
-        //
-        //     const ndc_x = (2.0*target_screen_position.x) / screen_width - 1.0;
-        //     const ndc_y = 1.0 - (2.0*target_screen_position.y) / screen_height;
-        //
-        //     var near_point = rl.Vector3Unproject(.{ .x = ndc_x, .y = ndc_y, .z = 0.0 }, matProj, matView);
-        //     var far_point  = rl.Vector3Unproject(.{ .x = ndc_x, .y = ndc_y, .z = 1.0 }, matProj, matView);
-        //
-        //     var direction = rl.Vector3Subtract(far_point, near_point).normalize();
-        //
-        //     var origin: rl.Vector3 = undefined;
-        //     if (camera.projection == .CAMERA_PERSPECTIVE) {
-        //         origin = camera.position;
-        //     } else {
-        //         origin = rl.Vector3Unproject(.{ .x = ndc_x, .y = ndc_y, .z = -1.0 }, matProj, matView);
-        //     }
-        //
-        //     var world_pos = origin.add(direction.scale(3));
-        //
-        //     model_position = world_pos;
-        // }
-
-        const cameraPos = [3]f32{ camera.position.x, camera.position.y, camera.position.z };
-        rl.SetShaderValue(shader, shader.locs.?[@intFromEnum(rl.ShaderLocationIndex.SHADER_LOC_VECTOR_VIEW)], &cameraPos, rl.ShaderUniformDataType.SHADER_UNIFORM_VEC3);
-        light.update_values(shader);
 
         rl.BeginDrawing();
+        {
             rl.ClearBackground(.{ .r = 33, .g = 33, .b = 33, .a = 255 });
 
-
+            rl.BeginMode3D(ctx.camera);
-            rl.BeginMode3D(camera);
+            main_scene.draw();
-                rl.DrawModel(model, model_position, 1.0, rl.WHITE);
-
-                // rl.rlPushMatrix();
-                //     rl.rlSetLineWidth(2);
-                //     rl.rlTranslatef(model_position.x, model_position.y, model_position.z);
-                //     rl.DrawBoundingBox(model_bbox, rl.GREEN);
-                // rl.rlPopMatrix();
             rl.EndMode3D();
+        }
+        rl.EndDrawing();
 
-       rl.EndDrawing();
-
-        // if (!edit_mode) {
-        //     rl.ClearBackground(rl.DARKGRAY);
-        //
-        //     const scale_x = @divFloor(screen_width, chip.display_width);
-        //     const scale_y = @divFloor(screen_height, chip.display_height);
-        //     const min_scale = @min(scale_x, scale_y);
-        //
-        //     const display_width = chip.display_width * min_scale;
-        //     const display_height = chip.display_height * min_scale;
-        //     const display_x = @divFloor(screen_width - display_width, 2);
-        //     const display_y = @divFloor(screen_height - display_height, 2);
-        //     raylib_chip.render(display_x, display_y, display_width, display_height);
-        // } else {
-        //     rl.ClearBackground(rl.RAYWHITE);
-        //     ui.update();
-        //
-        //     if (tab == .MemoryView) {
-        //         try memory_view.show(&ui, 0, 0, @floatFromInt(screen_width), @floatFromInt(screen_height), &selected_memory);
-        //     }
-        // }
     }
 }

src/raylib-chip.zig

@@ -8,12 +8,12 @@ on_color: rl.Color,
 off_color: rl.Color,
 timer_speed: f32,
 tick_speed: f32,
-beep_sound: ?*rl.Sound,
+beep_sound: ?rl.Sound,
 
 tick_time: f32,
 timer_time: f32,
 
-pub fn init(chip: *ChipContext, beep_sound: ?*rl.Sound) Self {
+pub fn init(chip: *ChipContext, beep_sound: ?rl.Sound) Self {
     return Self{
         .chip = chip,
         .off_color = rl.BLACK,
@@ -22,7 +22,7 @@ pub fn init(chip: *ChipContext, beep_sound: ?*rl.Sound) Self {
         .tick_speed = 500,
         .tick_time = 0,
         .timer_time = 0,
-        .beep_sound = beep_sound
+        .beep_sound = beep_sound,
     };
 }
 
@@ -72,29 +72,24 @@ pub fn update(self: *Self, dt: f32) void {
 
     if (self.beep_sound) |beep_sound| {
         if (self.chip.ST > 0) {
-            if (!rl.IsSoundPlaying(beep_sound.*)) {
+            if (!rl.IsSoundPlaying(beep_sound)) {
-                rl.PlaySound(beep_sound.*);
+                rl.PlaySound(beep_sound);
             }
         } else {
-            if (rl.IsSoundPlaying(beep_sound.*)) {
+            if (rl.IsSoundPlaying(beep_sound)) {
-                rl.StopSound(beep_sound.*);
+                rl.StopSound(beep_sound);
             }
         }
     }
 }
 
-pub fn render(self: *Self, x: i32, y: i32, width: i32, height: i32) void {
+pub fn render(self: *Self) void {
-    const pixel_width = @divFloor(width, self.chip.display_width);
+    rl.DrawRectangle(0, 0, self.chip.display_width, self.chip.display_height, self.off_color);
-    const pixel_height = @divFloor(height, self.chip.display_height);
 
-    rl.DrawRectangle(x, y, width, height, self.off_color);
+    for (0..self.chip.display_height) |y| {
-
+        for (0..self.chip.display_width) |x| {
-    for (0..self.chip.display_height) |oy| {
+            if (self.chip.display_get(@intCast(x), @intCast(y))) {
-        for (0..self.chip.display_width) |ox| {
+                rl.DrawPixel(@intCast(x), @intCast(y), self.on_color);
-            if (self.chip.display_get(@intCast(ox), @intCast(oy))) {
-                const ix = x + @as(i32, @intCast(ox)) * pixel_width;
-                const iy = y + @as(i32, @intCast(oy)) * pixel_height;
-                rl.DrawRectangle(ix, iy, pixel_width, pixel_height, self.on_color);
             }
         }
     }

src/shaders/main.fs

@@ -75,7 +75,6 @@ void main()
     }
 
     finalColor = (texelColor*((colDiffuse + vec4(specular, 1.0))*vec4(lightDot, 1.0)));
-    finalColor += texelColor*(ambient/10.0)*colDiffuse;
 
     // Gamma correction
     finalColor = pow(finalColor, vec4(1.0/1.9));