Diorite 💎

High-Performance 2D & 3D Debug Drawing Plugin & Frame DSL for Godot Engine 4.8+

Diorite is a debug drawing plugin and immediate-mode DSL for Godot 4.8+ powered by the Lapis Crystal toolchain. Inspired by tools like Godot's DebugDraw3D and Raylib's immediate drawing functions, Diorite provides both a node-based scene workflow and a zero-allocation frame-based DSL for real-time visualization.

📖 Full API & Architecture Documentation: https://sol-vin.github.io/diorite/

All debug primitives render with highest visual priority:

• 3D: Unshaded StandardMaterial3D with depth testing disabled (FlagDisableDepthTest = true) and render_priority = 127.
• 2D: Rendered onto an overlay CanvasLayer at layer = 128 with z_index = 4096 (z_as_relative = false).

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⚡ Performance Benchmarks

Diorite was engineered from the ground up for extreme throughput and zero-allocation runtime performance. Benchmarks measured on Crystal 1.21.0:

In a 60 FPS frame budget (16.6 milliseconds), drawing 700 mixed 2D and 3D shapes takes only 0.21 ms (~1.3% of the frame budget).

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✨ Features & Visualization Suite

Diorite ships with 35+ debug visualization items and developer UX helpers:

1. Standard 3D Items

• Line 3D (line_3d): Single segment between two 3D vectors.
• Arrow 3D (arrow_3d): Directional vector with conical arrowhead.
• Line with Arrow 3D: Convenience combination line with terminal arrowhead.
• Line Path 3D (line_path_3d): Continuous polyline through an array of points.
• Box 3D (box_3d): Axis-aligned wireframe bounding box with configurable center and extents.
• Sphere 3D (sphere_3d): 3-axis orthogonal ring wireframe sphere.
• Cylinder 3D (cylinder_3d): Circular top/bottom caps with longitudinal column struts.
• Capsule 3D (capsule_3d): Hemispherical capped cylinder wireframe.
• Plane 3D (plane_3d): Oriented rectangular quad grid with normal indicator.
• Points 3D (points_3d): Collection of 3D point markers (small 3-axis crosshairs).
• Position 3D (position_3d): 3-axis RGB crosshair indicating world position and scale.
• Gizmo 3D (gizmo_3d): Basis transform indicator with Red=X, Green=Y, Blue=Z coordinate axes.
• Grid 3D (grid_3d): Multi-subdivision ground reference plane wireframe.
• Camera Frustum 3D (camera_frustum_3d): Projected view pyramid with near/far clipping planes.
• Billboard Opaque Square 3D (billboard_square_3d): Camera-facing quad marker.
• Text 3D (text_3d): World-positioned 3D billboard text labels with depth priority.

2. Game-Dev Spatial Helpers & Swept Shape Casts

• SphereCast 3D (sphere_cast_3d): Swept collision sphere with tangent boundary rays and impact indicators.
• CapsuleCast 3D (capsule_cast_3d): Swept character capsule with cylindrical rail connectors.
• BoxCast 3D (box_cast_3d): Swept bounding box query with 8 corner connector rays.
• Cubic Bézier 3D (bezier_cubic_3d): Smooth polynomial curve with optional control hull.
• Catmull-Rom Spline 3D (catmull_rom_3d): Smooth multi-waypoint patrol or trajectory curve.
• Actor Card 3D (actor_card_3d): Overhead billboard frame with ground anchor pole and key-value stat blocks.
• Vision Cone 3D (cone_3d / vision_cone_3d): Swept spotlight or AI detection cone.
• Planar Circle 3D (circle_3d): Arbitrarily oriented 3D circular ring.
• Raycast Hit Visualizer (ray_hit_3d): Ray path + surface hit point + surface normal reflection.
• Trajectory Arc (trajectory_arc_3d): Ballistic projectile path computed under gravity.
• Oriented Bounding Box (OBB) (obb_3d): Arbitrarily rotated 3D wireframe box defined by a Basis.
• Motion Trail (trail_3d): Smooth history trail following any moving entity over time.
• Helical Spring (spring_3d): 3D wire spiral for physics constraints and raycast suspension.
• Surface Contact Disk (surface_disk_3d): Normal-aligned circular disc indicating contact patches.
• Distance Measurement Ruler 3D (ruler_3d): Calibrated measurement bar with tick marks and automatic midpoint readout.
• 3D Reticle (reticle_3d): Weapon aim target or lock-on circle with corner brackets.

3. Data Visualization & Charting

• Pie & Donut Charts 2D & 3D (pie_chart_2d, pie_chart_3d): Categorical breakdown with slice spokes and optional donut hole.
• Bar Charts & Histograms 2D (bar_chart_2d): Vertical or horizontal bars with coordinate axis frames and auto-scaling.
• Radial Gauges 2D & 3D (gauge_2d, gauge_3d): Speedometer-style dials with tick marks and needle pointers.
• Multi-Series Telemetry Graphs (stat_graph_2d, telemetry_series_2d, telemetry_threshold_2d): Real-time scrolling performance and variable sparklines with threshold limit guidelines.

4. 2D Canvas Helpers

• 2D Capsule (capsule_2d): Stadium capsule with semicircular end caps.
• 2D Vision Cone (vision_cone_2d): Field-of-view sensory wedge.
• 2D Arc & Sector (arc_2d, sector_2d): Circular arcs and pie sectors.
• 2D Ruler (ruler_2d): Calibrated screen-space distance measuring ruler.
• 2D Primitives: line_2d, arrow_2d, rect_2d, circle_2d, points_2d, path_2d, text_2d.

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🎮 Developer UX & Workflow Features

Category / Channel Filtering

Organize debug output into logical layers and selectively toggle them:

# Draw within an AI channel
DebugDraw.channel("ai") do |d|
  d.vision_cone_3d(enemy.position, enemy.forward, angle_deg: 45.0, range: 10.0)
  d.actor_card_3d(enemy.position, "Enemy Scout", {"HP" => "100%", "State" => "Alert"})
end

# Toggle channels via console command or hotkey
DebugDraw.disable_channel("ai") # Suppresses all AI drawing
DebugDraw.enable_channel("ai")  # Restores AI drawing

Local-Space Transform Stacks

Draw directly relative to moving nodes or local coordinate systems without manual math:

DebugDraw.with_transform(vehicle.global_transform) do
  # These points and boxes automatically rotate and translate with the vehicle
  DebugDraw.box_3d(Godot::Vector3.new(0, 0, 0), Godot::Vector3.new(2, 1, 4))
  DebugDraw.arrow_3d(Godot::Vector3.new(0, 1, 0), Godot::Vector3.new(0, 1, 3))
end

Frame Freeze Mode

Pause lifetime decay with DebugDraw.freeze! to orbit the camera freely and inspect collision glitches:

# Freeze active debug shapes so they don't disappear while inspecting
DebugDraw.freeze!

# Orbit camera freely...

# Resume normal decay
DebugDraw.unfreeze!

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🚀 Usage Example

require "lapis"
require "diorite"

# 1. Immediate-mode drawing in _process
def _process(delta : Float64) : Void
  # Swept sphere cast
  DebugDraw.sphere_cast_3d(start_pos, target_pos, radius: 0.5_f32, hit: is_hit)

  # Data visualization: 2D Bar Chart
  bars = [
    Diorite::BarData.new("RigidBodies", 42.0_f32, Color.new(0.2, 0.8, 0.3)),
    Diorite::BarData.new("Particles", 120.0_f32, Color.new(0.8, 0.3, 0.2))
  ]
  DebugDraw.bar_chart_2d(Rect2.new(20, 200, 160, 80), bars: bars, title: "Engine Stats")

  # Multi-series telemetry graph
  DebugDraw.telemetry_series_2d("Engine", "Frame", frame_ms, Color.new(0.2, 0.9, 0.3))
  DebugDraw.telemetry_series_2d("Engine", "Physics", physics_ms, Color.new(0.2, 0.5, 1.0))
  DebugDraw.telemetry_threshold_2d("Engine", 16.66_f32, Color.new(1.0, 0.2, 0.2, 0.8), "60 FPS")
end

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🛠️ Project Structure

diorite/
├── .github/workflows/
│   ├── ci.yml               # Multi-platform CI (Specs, Benchmarks, Godot Headless Smoke Test)
│   └── docs.yml             # Automatic Lapis documentation generation & GitHub Pages deployment
├── addons/
│   ├── crystal_integration/ # Lapis Crystal GDExtension integration
│   └── diorite/             # Diorite Godot addon manifest & plugin
│       ├── plugin.cfg
│       ├── diorite.gd
│       └── diorite.gdextension
├── bench/
│   └── benchmark_suite.cr   # Comprehensive benchmark suite (IPS & Benchmark.bm)
├── docs_src/                # Source documentation in YAML for lapis docs compiler
├── docs/                    # Compiled static documentation site
├── scenes/
│   └── main.tscn            # Showcase test scene demonstrating Diorite items
├── spec/                    # Pure Crystal unit test suite (53 specs across 7 suites)
│   ├── charts_spec.cr
│   ├── spatial_helpers_spec.cr
│   ├── channels_and_transforms_spec.cr
│   ├── geometry_builder_spec.cr
│   ├── math_helpers_spec.cr
│   ├── dsl_spec.cr
│   ├── dsl_queue_spec.cr
│   ├── telemetry_graph_spec.cr
│   └── spec_helper.cr
├── src/
│   ├── demo/                # Showcase demo controller
│   │   └── demo_controller.cr
│   ├── diorite/
│   │   ├── core/            # Geometry builder, chart builder, math, command queues, DSL
│   │   ├── nodes/           # Node-based 3D and 2D debug shapes & manager
│   │   └── diorite.cr       # Addon entry point
│   └── main.cr              # Project root game entry point
├── project.godot            # Godot 4.8 engine project configuration
├── shard.yml                # Crystal dependency manifest
└── godot-version.yml        # Target Godot version specification (4.8-dev6)

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🧪 Testing & Benchmarking

Running Unit Specs (53 specs)

Diorite contains comprehensive unit specs covering all 35+ geometric builders, charts, channels, transform stacks, vertex counts, color assignments, telemetry ring buffers, and command queue duration decay:

crystal spec

Running Benchmark Suite

crystal run --release bench/benchmark_suite.cr

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📄 License

Licensed under the MIT License. See LICENSE for details.