xenation / ionengine

Experimental Game Engine (uses Clustered Deferred)

IonEngine

IonEngine is currently under developpement. It's main purpose is to experiment with several techniques.

Features

• Scene Hierarchy
• Custom math library (uses SIMD instructions and Rotors for rotations)
• Deferred Renderer
• Clustered Shading (compute shader light assignment)
• Basic BRDF with metallic workflow
• Shader pipeline (detects layouts and possible permutations, uses UBOs to define Materials)
• Basic Shadows with Atlas (Directional and Spotlights supported)
• GUI using DearIMGUI
• Basic Bullet3 implementation

Upcoming

• DX12 / Vulkan
• Better Shadows (Point light support, better smooth)
• Mesh Import pipeline
• Textured Skybox
• Handles to edit scene
• Scene file format

ionengine's Issues

Simple Frustum Culling

Better Creation of Shaders from raw/inlined source

Better Shader/Material find performance

Hash shader/material name strings for a better find performance.

Framebuffer separate clear colors

Ability to defines separate clear behaviors for each attachment.

Basic Clustered Shading

Deferred Shading better worldPos precision

Use precise depth buffer to determine worldpos for deferred shading. Should avoid some z-fighting-like artefacts on lights.

Basic PBR

Implement basic PBR rendering, using metallic workflow.

Textured Test Shader

A Test shader that supports several textures (albedo, spec, normals, ...), to have a better representation of the capabilities.

Workaround for the std140 vec3 alignment

Make a workaround the implementation specific bug for the vec3 variables in uniform blocks with std140 layout. In some implementations vec3 does not follow correctly the std140 rules and has alignment of 3 floats instead of 4.

Clear warnings

More VisualDebug Functions

• drawCube(Vec3f center, Vec3f size, Color color)
• drawFrustum(Matrix4x4f vpMatrix, Color color)
• drawMesh(Mesh mesh, Color color)
• drawRay(Ray3f ray, Color color)
• drawSphere(Vec3f center, float radius, Color color)
• drawWireCube(Vec3f center, Vec3f size, Color color)
• drawWireMesh(Mesh mesh, Color color)
• drawWireSphere(Vec3f center, float size, Color color)

Renderer Component Material change callback/event

FrameBuffer Pool for temporary buffers

More Math Constants

• PI
• PI * 2
• PI / 2
• PI / 4
• E
• (PositiveInfinity)
• (NegativeInfinity)
• Deg2Rad
• Rad2Deg

Materials constant parameters

Support compile-time constant parameters on materials.

Basic Shadows Support (Directional + Spots)

Physics Debug Window

More vector methods

Adding some simple vector methods (currently only the Vec3f has methods).

OpenGL debug markers for Render Passes

Shader Preprocessor automatic uniform buffer layout fill

When preprocessing a shader, for each uniform buffer layout, check for missing fields and add them. This can currently only be done for the global buffers.

Exemple

Expected fields:

• mat4x4 projectionMatrix
• mat4x4 viewMatrix
• ivec2 resolution
• uint sampleCount

Input code:

layout (std140, binding = 1) uniform Camera {
	ivec2 resolution;
	uint sampleCount;
};

Output code:

layout (std140, binding = 1) uniform Camera {
	mat4x4 projectionMatrix;
	mat4x4 viewMatrix;
	ivec2 resolution;
	uint sampleCount;
};

Better VisualDebug.Draw performance

Basic Deferred Rendering Pipeline

Use Rotors instead of Quaternions

Simple Integrated Console Window

Mouse Sub-pixel accuracy when locked

Mesh Importer

Flexible Random class

Implement a flexible Random class that allows:

• Using an instance of the class to have an isolated seed and output values
• Using static methods for quick access to random values

Flip Matrix4x4f constructor to use Row Major order of parameters

Use row major order of parameters in Matrix4x4f constructor for more readability.

Fix Input Unknown key crash

fix crash when pressing keys unknown by the input system (media keys).

Better Cluster intersection tests

Fix some incorrect cases for intersections by using SDF or plane tests

More Copy Constructors

Add proper copy constructors for entities, meshes, textures and others.

Fix glslTypeFromString fail with mat4

Fix Shadow Offset when Moving

Light Component Inspector

Transform Inspector euler rotation

Component Inspector

Fix Light Assignement Concurrency issues

Light Classes

The classes related to the definition of lights.

Math Intersection and Projection Methods

Intersection Tests

	Boxi	Boxf	Recti	Rectf	Ray2f	Ray3f	Line2f	Line3f	Segment2f	Segment3f	Plane	OBB2D	OBB3D	Frustum3f
Boxi	X	X				X		X		X	X		X	X
Boxf	X	X				X		X		X	X		X	X
Recti			X	X	X		X		X			X
Rectf			X	X	X		X		X			X
Ray2f			X	X	X		X		X			X
Ray3f	X	X						(X)		(X)	X		X	X
Line2f			X	X	X		X		X			X
Line3f	X	X				(X)		(X)		(X)	X		X	X
Segment2f			X	X	X		X		X			X
Segment3f	X	X				(X)		(X)		(X)	X		X	X
Plane	X	X				X		X		X	X		X	X
OBB2D			X	X	X		X		X			X
OBB3D	X	X				X		X		X	X		X	X
Frustum3f	X	X				X		X		X	X		X	(X)

Intersection Results

	Boxi	Boxf	Recti	Rectf	Ray2f	Ray3f	Line2f	Line3f	Segment2f	Segment3f	Plane	OBB2D	OBB3D	Frustum3f
Boxi	Boxi	Boxf				Vec3f		Vec3f		Vec3f	SIDE		/	/
Boxf	Boxf	Boxf				Vec3f		Vec3f		Vec3f	SIDE		/	/
Recti			Recti	Rectf	Vec2f		Vec2f		Vec2f			/
Rectf			Rectf	Rectf	Vec2f		Vec2f		Vec2f			/
Ray2f			Vec2f	Vec2f	Vec2f		Vec2f		Vec2f			Vec2f
Ray3f	Vec3f	Vec3f						(Vec3f)		(Vec3f)	Vec3f		Vec3f	Vec3f
Line2f			Vec2f	Vec2f	Vec2f		Vec2f		Vec2f			Vec2f
Line3f	Vec3f	Vec3f				(Vec3f)		(Vec3f)		(Vec3f)	Vec3f		Vec3f	Vec3f
Segment2f			Vec2f	Vec2f	Vec2f		Vec2f		Vec2f			Vec2f
Segment3f	Vec3f	Vec3f				(Vec3f)		(Vec3f)		(Vec3f)	Vec3f		Vec3f	Vec3f
Plane	SIDE	SIDE				Vec3f		Vec3f		Vec3f	(Line3)		/	/
OBB2D			/	/	Vec2f		Vec2f		Vec2f			/
OBB3D	/	/				Vec3f		Vec3f		Vec3f	/		/	/
Frustum3f	/	/				Vec3f		Vec3f		Vec3f	/		/	/

Projections

proj/shape	Boxi	Boxf	Recti	Rectf	Ray2f	Ray3f	Line2f	Line3f	Segment2f	Segment3f	Plane	OBB2D	OBB3D
Vec2i			Vec2i
Vec2f			Vec2f	Vec2f	Vec2f		Vec2f		Vec2f			Vec2f
Vec3i	Vec3i
Vec3f	Vec3f	Vec3f				Vec3f		Vec3f		Vec3f	Vec3f		Vec3f

Auto Resources Copy on build

Automatically copy all resources when building to avoid having to manually change the parameters of each res file in VS.

Fullscreen Shortcut

Support F11 for fullscreen/windowed switch.

Make an IonEngine namespace

Self Contained Assets System

Implement a build mode that allows including all assets into the executable file. This requires an API for the manipulation of files included. The API should implement a folder structure and allow modifications, creations and deletions.

Implement support for the shared layout

Better Textures

Improve Texture creation, to allow for more customisation and avoid unnecessary allocations

More math structures

Add a few useful math structures:

• Ray2f
• Line2f
• Line3f
• Segment2f
• Segment3f
• OBB2D
• OBB3D

(also rename Ray to Ray3f)

Cap deltaTime

Cap the deltaTime to avoid extreme movements on lag spikes.

Fix OBJ models being ignored

Optimised Frustum Culling

Perform Frustum culling using trees or other optimisations.

Improved Input System

Make a proper in depth input system (like Unity's experimental InputSystem)