goga

package module
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 Go to latest Published: Aug 18, 2016 License: MIT Imports: 18 Imported by: 5

README

go-game (package "goga")

Game engine written in Go using OpenGL and GLFW. Mostly for 2D rendering, but also capable of rendering 3D, providing everything to get you started.

Install

go-game requires OpenGL and GLFW. The following three steps install everything you need:

go get github.com/go-gl/gl/v3.2-core/gl
go get github.com/go-gl/glfw/v3.2/glfw
go get github.com/DeKugelschieber/go-game

You also need a cgo compiler (typically gcc) and GL/GLFW development libraries and headers. You can find further instructions on the GitHub pages below (see dependencies).

Usage

Examples can be found within the demo folder. For full reference visit: https://godoc.org/github.com/DeKugelschieber/go-game

Dependencies

To use a different GL version, you need to replace the GL imports in package goga.

Contribute

To contribute, please create pull requests. The code must be formatted by gofmt and fit into the architecture.

License

MIT

Documentation

Index

Constants

View Source 
const (
	// constants for default 2D shader
	Default_shader_2D_vertex_attrib   = "vertex"
	Default_shader_2D_texcoord_attrib = "texCoord"
	Default_shader_2D_ortho           = "o"
	Default_shader_2D_model           = "m"
	Default_shader_2D_tex             = "tex"

	// constants for default 3D shader
	Default_shader_3D_vertex_attrib   = "vertex"
	Default_shader_3D_texcoord_attrib = "texCoord"
	Default_shader_3D_pv              = "pv"
	Default_shader_3D_model           = "m"
	Default_shader_3D_tex             = "tex"

	// constants for default text shader
	Default_shader_text_vertex_attrib   = "vertex"
	Default_shader_text_texcoord_attrib = "texCoord"
	Default_shader_text_ortho           = "o"
	Default_shader_text_model           = "m"
	Default_shader_text_tex             = "tex"
	Default_shader_text_color           = "color"
)
View Source 
const NullTerminator = "\x00"

Variables

View Source 
var (

	// Default resources
	DefaultCamera     *Camera
	Default2DShader   *Shader
	Default3DShader   *Shader
	DefaultTextShader *Shader
)

Functions

func AddKeyboardListener 

func AddKeyboardListener(listener KeyboardListener)

Adds a new keyboard listener.

func AddLoader 

func AddLoader(loader ResLoader) bool

Adds a loader. If a loader with the same file extension exists already, false will be returned.

func AddMouseListener 

func AddMouseListener(listener MouseListener)

Adds a new mouse listener.

func AddScene 

func AddScene(scene Scene) bool

Adds a scene to game. Returns false if the scene exists already. The first scene added will be set active.

func AddSystem 

func AddSystem(system System) bool

Adds a system to the game. Returns false if the system exists already.

func CheckGLError 

func CheckGLError()

Checks for GL errors and prints to log if one occured.

func ClearColorBuffer 

func ClearColorBuffer(do bool)

Adds color buffer to list of buffers to be cleared. If parameter is false, it will be removed.

func ClearDepthBuffer 

func ClearDepthBuffer(do bool)

Adds depth buffer to list of buffers to be cleared. If parameter is false, it will be removed.

func CreateCubeMesh 

func CreateCubeMesh() (*VBO, *VBO, *VBO)

Creates three VBOs for a 3D cube mesh. Texture coordinates won't map properly. This function is supposed to be used for 3D testing.

func CreateRectMesh 

func CreateRectMesh(flip bool) (*VBO, *VBO, *VBO)

Creates three VBOs for a 2D rectangle.

func DistanceVec2 

func DistanceVec2(a, b Vec2) float64

Returns the distance between two 2D vectors.

func DistanceVec3 

func DistanceVec3(a, b Vec3) float64

Returns the distance between two 3D vectors.

func DistanceVec4 

func DistanceVec4(a, b Vec4) float64

Returns the distance between two 4D vectors.

func Drop 

func Drop(objects []Dropable)

Drops given GL objects. Objects must implement the Dropable interface.

func EnableAlphaBlending 

func EnableAlphaBlending(enable bool)

Enables/Disables alpha blending by source alpha channel. BLEND = SRC_ALPHA | ONE_MINUS_SRC_ALPHA

func EnableDepthTest 

func EnableDepthTest(enable bool)

Enables/Disables depth test.

func GetHeight 

func GetHeight() int

Returns height of viewport.

func GetWidth 

func GetWidth() int

Returns width of viewport.

func LoadResFromFolder 

func LoadResFromFolder(path string) error

Loads all files from given folder path. If a loader is missing or fails to load the resource, an error will be returned. All resources will be kept until an error occures.

func NewFBOWithTex2D 

func NewFBOWithTex2D(width, height, filter int32) (*FBO, *Tex)

Creates a new FBO with given target and 2D texture. Used to render to texture.

func RemoveActor 

func RemoveActor(actor *Actor) bool

Removes an actor from all systems. This maybe not as performant as directly removing it from the right system. Returns true if it could be removed from at least one system, else false.

func RemoveActorById 

func RemoveActorById(id ActorId) bool

Removes an actor from all systems by ID. This maybe not as performant as directly removing it from the right system. Returns true if it could be removed from at least one system, else false.

func RemoveAllKeyboardListener 

func RemoveAllKeyboardListener()

Removes all registered keyboard listeners.

func RemoveAllLoaders 

func RemoveAllLoaders()

Removes all loaders.

func RemoveAllMouseListener 

func RemoveAllMouseListener()

Removes all registered mouse listeners.

func RemoveAllRes 

func RemoveAllRes()

Removes all resources.

func RemoveAllScenes 

func RemoveAllScenes()

Removes all scenes.

func RemoveAllSystems 

func RemoveAllSystems()

Removes all systems.

func RemoveKeyboardListener 

func RemoveKeyboardListener(listener KeyboardListener)

Removes given keyboard listener if found.

func RemoveLoader 

func RemoveLoader(loader ResLoader) bool

Removes a loader. Returns false if loader could not be found.

func RemoveLoaderByExt 

func RemoveLoaderByExt(ext string) bool

Removes a loader by file extension. Returns false if loader could not be found.

func RemoveMouseListener 

func RemoveMouseListener(listener MouseListener)

Removes given mouse listener if found.

func RemoveResByName 

func RemoveResByName(name string) bool

Removes a resource by name. Returns false if resource could not be found.

func RemoveResByPath 

func RemoveResByPath(path string) bool

Removes a resource by path. Returns false if resource could not be found.

func RemoveScene 

func RemoveScene(scene Scene) bool

Removes a given scene. Returns false if it could not be found.

func RemoveSystem 

func RemoveSystem(system System) bool

Removes the given system. Returns false if it could not be found.

func Run 

func Run(game Game, options *RunOptions)

Creates a new window with given options and starts the game. The game struct must implement the Game interface. If options is nil, the default options will be used. This function will panic on error.

func SetClearColor 

func SetClearColor(r, g, b, a float64)

Sets GL clear color.

func SetViewport 

func SetViewport(x, y, width, height int32)

Sets GL viewport and updates default resources and systems.

func Stop 

func Stop()

Stops the game and closes the window.

func SwitchScene 

func SwitchScene(scene Scene)

Switches to given scene. This will pause the currently active scene.

func SwitchSceneByName 

func SwitchSceneByName(name string) bool

Switches to given existing scene by name. Returns false if the scene does not exist.

Types

type Actor 

type Actor struct {
	// contains filtered or unexported fields
}

A basic actor, having a unique ID. Use NewActor() to create new actors.

func NewActor 

func NewActor() *Actor

Creates a new basic actor with unique ID.

func (*Actor) GetId 

func (a *Actor) GetId() ActorId

Returns the ID of actor.

type ActorId 

type ActorId uint64

An actor ID is a unique integer, which can be used to reference an actor.

type AnimatedSprite 

type AnimatedSprite struct {
	*Actor
	*Pos2D
	*Tex
	*KeyframeSet
	*KeyframeAnimation
}

An animated sprite is a sprite with keyframe animation information. It will be updated and rendered by the KeyframeRenderer.

func NewAnimatedSprite 

func NewAnimatedSprite(tex *Tex, set *KeyframeSet, width, height int) *AnimatedSprite

Creates a new animated sprite.

type Camera 

type Camera struct {
	Viewport                  Vec4
	Position, LookAt, Up      Vec3
	Fov, Ratio, Znear, Zfar   float64
	Projection, Ortho3D, View Mat4
	Ortho                     Mat3
}

func NewCamera 

func NewCamera(x, y, width, height int) *Camera

Creates a new 2D/3D camera. Pass the viewport as arguments.

func (*Camera) CalcOrtho 

func (c *Camera) CalcOrtho() *Mat3

Calculates orthogonal projection matrix and returns it.

func (*Camera) CalcOrtho3D 

func (c *Camera) CalcOrtho3D() *Mat4

Calculates 3D orthogonal projection matrix and returns it.

func (*Camera) CalcProjection 

func (c *Camera) CalcProjection() *Mat4

Calculates projection matrix and returns it.

func (*Camera) CalcRatio 

func (c *Camera) CalcRatio()

Calculates viewport ratio (width/height).

func (*Camera) CalcView 

func (c *Camera) CalcView() *Mat4

Calculates view matrix and returns it.

func (*Camera) SetViewport 

func (c *Camera) SetViewport(x, y, width, height int)

Updates viewport.

type Cullable 

type Cullable struct {
	*Actor
	*Pos2D
}

type Culling2D 

type Culling2D struct {
	// contains filtered or unexported fields
}

func GetCulling2DSystem 

func GetCulling2DSystem() *Culling2D

func NewCulling2D 

func NewCulling2D(x, y, width, height int) *Culling2D

Creates a new sprite culling system. To update the viewport, call SetViewport().

func (*Culling2D) Add 

func (c *Culling2D) Add(actor *Actor, pos *Pos2D) bool

Adds actor with Pos2D to the system.

func (*Culling2D) Cleanup 

func (c *Culling2D) Cleanup()

func (*Culling2D) GetName 

func (c *Culling2D) GetName() string

func (*Culling2D) Len 

func (c *Culling2D) Len() int

Returns number of cullable objects.

func (*Culling2D) Remove 

func (c *Culling2D) Remove(actor *Actor) bool

Removes actor with Pos2D from system.

func (*Culling2D) RemoveAll 

func (c *Culling2D) RemoveAll()

Removes all cullable objects.

func (*Culling2D) RemoveById 

func (c *Culling2D) RemoveById(id ActorId) bool

Removes actor with Pos2D from system by ID.

func (*Culling2D) SetViewport 

func (c *Culling2D) SetViewport(x, y, width, height int)

Sets the culling outer bounds. Actors outside of this box won't be rendered.

func (*Culling2D) Update 

func (c *Culling2D) Update(delta float64)

Updates visibility of all contained sprites.

type Dropable 

type Dropable interface {
	Drop()
}

The dropable interface is used to clean up GL objects. Use the Drop() function to drop a range of objects.

type FBO 

type FBO struct {
	// contains filtered or unexported fields
}

Frame Buffer Object.

func NewFBO 

func NewFBO(target uint32) *FBO

Creates a new FBO with given target.

func (*FBO) Bind 

func (f *FBO) Bind()

Binds the FBO for usage (rendered on).

func (*FBO) ClearAttachments 

func (f *FBO) ClearAttachments()

Removes all attached textures from FBO.

func (*FBO) Complete 

func (f *FBO) Complete() bool

Returns true if FBO is complete, else false.

func (*FBO) DrawBuffer 

func (f *FBO) DrawBuffer(mode uint32)

Sets draw buffer.

func (*FBO) DrawBuffers 

func (f *FBO) DrawBuffers(mode uint32)

func (*FBO) Drop 

func (f *FBO) Drop()

Drops the FBO.

func (*FBO) GetId 

func (f *FBO) GetId() uint32

Returns the GL ID.

func (*FBO) GetStatus 

func (f *FBO) GetStatus() uint32

Returns the status of the FBO.

func (*FBO) GetTarget 

func (f *FBO) GetTarget() uint32

Returns the target.

func (*FBO) ReadBuffer 

func (f *FBO) ReadBuffer(mode uint32)

Sets read buffer.

func (*FBO) Texture 

func (f *FBO) Texture(attachment, texId uint32, level int32)

Attaches a texture.

func (*FBO) Texture1D 

func (f *FBO) Texture1D(attachment, texId uint32, level int32)

Attaches a 1D texture.

func (*FBO) Texture2D 

func (f *FBO) Texture2D(attachment, texId uint32, level int32)

Attaches a 2D texture.

func (*FBO) Texture3D 

func (f *FBO) Texture3D(attachment, texId uint32, level, layer int32)

Attaches a 3D texture.

func (*FBO) Unbind 

func (f *FBO) Unbind()

Unbinds.

type Font 

type Font struct {
	Tex *Tex

	CharPadding      Vec2
	Space, Tab, Line float64
	// contains filtered or unexported fields
}

Font represents a texture mapped font. It can be loaded from JSON together with a texture.

func NewFont 

func NewFont(tex *Tex, tileSize float64) *Font

Creates a new font for given texture. The tile size specifies the size of one character tile on texture. Characters must be added afterwards.

func (*Font) FromJson 

func (f *Font) FromJson(path string, cut bool) error

Loads characters from JSON file. Format:

[ 

    {
        "char": "a",
        "x": 0,
        "y": 0,
		   "offset": 0
    },
    ...

]

Where x and y start in the upper left corner of the texture, both of type int. Offset is optional and can be used to move a character up or down (relative to others). If cut is set to true, the characters will be true typed.

type Game 

type Game interface {
	Setup()
	Update(float64)
}

Main game object. Setup will be called before the main loop and after GL context has been created. Update will be called each frame. This can be used to switch scenes or end game on win state. For game logic, System should be used.

type KeyboardListener 

type KeyboardListener interface {
	OnKeyEvent(glfw.Key, int, glfw.Action, glfw.ModifierKey)
}

Interface for keyboard input events. Implement and register to receive keyboard input.

type Keyframe 

type Keyframe struct {
	Min, Max Vec2
	// contains filtered or unexported fields
}

A single keyframe within a keyframe set.

func NewKeyframe 

func NewKeyframe(min, max Vec2) *Keyframe

Creates a new single keyframe with texture VBO.

type KeyframeAnimation 

type KeyframeAnimation struct {
	Start, End    int
	Loop          bool
	Speed         float64
	Current       int
	Interpolation float64
}

Keyframe animation component. It has a start and an end frame, a play speed and option to loop.

func NewKeyframeAnimation 

func NewKeyframeAnimation(start, end int, loop bool, speed float64) *KeyframeAnimation

Creates a new keyframe animation with given start, end and loop.

type KeyframeRenderer 

type KeyframeRenderer struct {
	Pos2D

	Shader *Shader
	Camera *Camera
	// contains filtered or unexported fields
}

The keyframe renderer renders animated sprites. It has a 2D position component, to move all sprites at once.

func GetKeyframeRenderer 

func GetKeyframeRenderer() *KeyframeRenderer

func NewKeyframeRenderer 

func NewKeyframeRenderer(shader *Shader, camera *Camera) *KeyframeRenderer

Creates a new keyframe renderer using given shader and camera. If shader and/or camera are nil, the default one will be used.

func (*KeyframeRenderer) Add 

func (s *KeyframeRenderer) Add(actor *Actor, pos *Pos2D, tex *Tex, set *KeyframeSet, animation *KeyframeAnimation) bool

Adds animated sprite to the renderer.

func (*KeyframeRenderer) Cleanup 

func (s *KeyframeRenderer) Cleanup()

Frees recources created by keyframe renderer. This is called automatically when system gets removed.

func (*KeyframeRenderer) GetName 

func (s *KeyframeRenderer) GetName() string

func (*KeyframeRenderer) Len 

func (s *KeyframeRenderer) Len() int

Returns number of sprites.

func (*KeyframeRenderer) Remove 

func (s *KeyframeRenderer) Remove(actor *Actor) bool

Removes animated sprite from renderer.

func (*KeyframeRenderer) RemoveAll 

func (s *KeyframeRenderer) RemoveAll()

Removes all animated sprites.

func (*KeyframeRenderer) RemoveById 

func (s *KeyframeRenderer) RemoveById(id ActorId) bool

Removes sprite from renderer by ID.

func (*KeyframeRenderer) Update 

func (s *KeyframeRenderer) Update(delta float64)

Updates animation state and renders sprites.

type KeyframeSet 

type KeyframeSet struct {
	Keyframes []Keyframe
}

A set of keyframes making up an animation.

func NewKeyframeSet 

func NewKeyframeSet() *KeyframeSet

Creates a new empty keyframe set with given size.

func (*KeyframeSet) Add 

func (s *KeyframeSet) Add(frame *Keyframe) int

Adds a new keyframe to set and returns new length.

type Mat3 

type Mat3 struct {
	Values [9]float64
}

3x3 column major matrix.

func MultMat3 

func MultMat3(a, b *Mat3) *Mat3

Multiplies both matrices and returns a new Mat3.

func NewMat3 

func NewMat3(m00, m10, m20, m01, m11, m21, m02, m12, m22 float64) *Mat3

Creates a new 3x3 matrix with initial values.

func (*Mat3) Clear 

func (m *Mat3) Clear()

Sets the matrix to zeros.

func (*Mat3) Copy 

func (m *Mat3) Copy() *Mat3

Creates a copy of actual matrix.

func (*Mat3) Determinate 

func (m *Mat3) Determinate() float64

Returns the determinate of actual matrix.

func (*Mat3) Identity 

func (m *Mat3) Identity()

Sets the matrix to identity matrix.

func (*Mat3) Inverse 

func (m *Mat3) Inverse()

Sets the inverse of actual matrix.

func (*Mat3) Mult 

func (m *Mat3) Mult(mat *Mat3)

Multiplies actual matrix with given matrix and saves result.

func (*Mat3) MultVec 

func (m *Mat3) MultVec(v Vec3) Vec3

Multiplies given vector with actual matrix and returns result.

func (*Mat3) Ortho 

func (m *Mat3) Ortho(viewport Vec4)

Sets actual matrix to orthogonal projection with given viewport.

func (*Mat3) Rotate 

func (m *Mat3) Rotate(angle float64)

Rotates and saves actual matrix by given vector.

func (*Mat3) Scale 

func (m *Mat3) Scale(v Vec2)

Scales and saves actual matrix by given vector.

func (*Mat3) Translate 

func (m *Mat3) Translate(v Vec2)

Translates and saves actual matrix by given vector.

func (*Mat3) Transpose 

func (m *Mat3) Transpose()

Calculates and saves the transpose of actual matrix.

type Mat4 

type Mat4 struct {
	Values [16]float64
}

4x4 column major matrix.

func MultMat4 

func MultMat4(a, b *Mat4) *Mat4

Multiplies both matrices and returns a new Mat4.

func NewMat4 

func NewMat4(m00, m10, m20, m30, m01, m11, m21, m31, m02, m12, m22, m32, m03, m13, m23, m33 float64) *Mat4

Creates a new 4x4 matrix with initial values.

func (*Mat4) Clear 

func (m *Mat4) Clear()

Sets the matrix to zeros.

func (*Mat4) Copy 

func (m *Mat4) Copy() *Mat4

Creates a copy of actual matrix.

func (*Mat4) Determinate 

func (m *Mat4) Determinate() float64

Returns the determinate of actual matrix.

func (*Mat4) Identity 

func (m *Mat4) Identity()

Sets the matrix to identity matrix.

func (*Mat4) Inverse 

func (m *Mat4) Inverse()

Sets the inverse of actual matrix.

func (*Mat4) LookAt 

func (m *Mat4) LookAt(pos, lookAt, up Vec3)

Sets actual matrix to project to specified locations with given upper axis.

func (*Mat4) Mult 

func (m *Mat4) Mult(mat *Mat4)

Multiplies actual matrix with given matrix and saves result.

func (*Mat4) MultVec 

func (m *Mat4) MultVec(v Vec3) Vec3

Multiplies given vector with actual matrix and returns result.

func (*Mat4) Ortho 

func (m *Mat4) Ortho(viewport Vec4, znear, zfar float64)

Sets actual matrix to orthogonal projection with given viewport.

func (*Mat4) Perspective 

func (m *Mat4) Perspective(fov, ratio, znear, zfar float64)

Sets actual matrix to perspective projection with given viewport.

func (*Mat4) Rotate 

func (m *Mat4) Rotate(angle float64, axis Vec3)

Rotates and saves actual matrix by given vector.

func (*Mat4) Scale 

func (m *Mat4) Scale(v Vec3)

Scales and saves actual matrix by given vector.

func (*Mat4) Translate 

func (m *Mat4) Translate(v Vec3)

Translates and saves actual matrix by given vector.

func (*Mat4) Transpose 

func (m *Mat4) Transpose()

Calculates and saves the transpose of actual matrix.

type Mesh 

type Mesh struct {
	Index, Vertex, TexCoord *VBO
	Vao                     *VAO
}

Component representing a 3D mesh.

func NewMesh 

func NewMesh(index, vertex, texcoord *VBO) *Mesh

Creates a new mesh with given GL buffers. The VAO must be prepared by ModelRenderer.

func (*Mesh) Drop 

func (m *Mesh) Drop()

Drops the VBOs and VAO contained in mesh. This must not be done, if mesh was filled from outer source (like a ply file).

type Model 

type Model struct {
	*Actor
	*Pos3D
	*Tex
	*Mesh
}

Model is an actor having a 3D position, a texture and a 3D mesh.

func NewModel 

func NewModel(mesh *Mesh, tex *Tex) *Model

Creates a new model with given mesh and texture.

type ModelRenderer 

type ModelRenderer struct {
	Pos3D

	Shader *Shader
	Camera *Camera
	// contains filtered or unexported fields
}

The model renderer is a system rendering models. It has a 3D position component, to move all models at once.

func GetModelRenderer 

func GetModelRenderer() *ModelRenderer

func NewModelRenderer 

func NewModelRenderer(shader *Shader, camera *Camera, ortho bool) *ModelRenderer

Creates a new model renderer using given shader and camera. If shader and/or camera are nil, the default one will be used. Orth can be set to true, to use orthogonal projection.

func (*ModelRenderer) Add 

func (s *ModelRenderer) Add(actor *Actor, pos *Pos3D, tex *Tex, mesh *Mesh) bool

Adds model to the renderer. Perpare it first!

func (*ModelRenderer) Cleanup 

func (s *ModelRenderer) Cleanup()

func (*ModelRenderer) GetName 

func (s *ModelRenderer) GetName() string

func (*ModelRenderer) Len 

func (s *ModelRenderer) Len() int

Returns number of sprites.

func (*ModelRenderer) Prepare 

func (s *ModelRenderer) Prepare(model *Model)

Prepares a model to be rendered by setting up its VAO.

func (*ModelRenderer) Remove 

func (s *ModelRenderer) Remove(actor *Actor) bool

Removes model from renderer.

func (*ModelRenderer) RemoveAll 

func (s *ModelRenderer) RemoveAll()

Removes all sprites.

func (*ModelRenderer) RemoveById 

func (s *ModelRenderer) RemoveById(id ActorId) bool

Removes model from renderer by ID.

func (*ModelRenderer) Update 

func (s *ModelRenderer) Update(delta float64)

Render models.

type MouseListener 

type MouseListener interface {
	OnMouseButton(glfw.MouseButton, glfw.Action, glfw.ModifierKey)
	OnMouseMove(float64, float64)
	OnMouseScroll(float64, float64)
}

Interface for mouse input events. Implement and register to receive mouse input.

type Ply 

type Ply struct {
	IndexBuffer, VertexBuffer, TexCoordBuffer, NormalBuffer *VBO
	// contains filtered or unexported fields
}

Standford ply file resource.

func GetPly 

func GetPly(name string) (*Ply, error)

Finds and returns a Ply resource. If not found or when the resource is of wrong type, an error will be returned.

func (*Ply) Drop 

func (p *Ply) Drop()

Drops contained GL buffers.

func (*Ply) GetExt 

func (p *Ply) GetExt() string

Returns the file extension of this resource.

func (*Ply) GetName 

func (p *Ply) GetName() string

Returns the name of this resource.

func (*Ply) GetPath 

func (p *Ply) GetPath() string

Returns the path of this resource.

func (*Ply) SetExt 

func (p *Ply) SetExt(ext string)

Sets the file extension of this resource.

func (*Ply) SetName 

func (p *Ply) SetName(name string)

Sets the name of this resource.

func (*Ply) SetPath 

func (p *Ply) SetPath(path string)

Sets the path of this resource.

type PlyLoader 

type PlyLoader struct {
	VboUsage uint32
}

Loads ply files and creates VBOs within the Ply resource. The indices must be present as triangles. Expected type is float32. If it fails to parse, it will panic.

func (*PlyLoader) Ext 

func (p *PlyLoader) Ext() string

func (*PlyLoader) Load 

func (p *PlyLoader) Load(file string) (Res, error)

type PngLoader 

type PngLoader struct {
	Filter   int32
	KeepData bool
}

Loads textures from png files. If keepData is set to true, pixel data will be stored inside the texture (additionally to VRAM).

func (*PngLoader) Ext 

func (p *PngLoader) Ext() string

func (*PngLoader) Load 

func (p *PngLoader) Load(file string) (Res, error)

type Pos2D 

type Pos2D struct {
	Pos, Size, Scale, RotPoint Vec2
	Rot                        float64
	Visible                    bool
	M                          Mat3
}

Position component for 2D objects.

func NewPos2D 

func NewPos2D() *Pos2D

Creates a default initialized Pos2D.

func (*Pos2D) CalcModel 

func (p *Pos2D) CalcModel() *Mat3

Calculates model matrix for 2D positioning.

func (*Pos2D) GetCenter 

func (p *Pos2D) GetCenter() Vec2

Returns the center of object. Assumes y = 0 is bottom left corner, if not you have to subtract height of object.

func (*Pos2D) PointInRect 

func (p *Pos2D) PointInRect(point Vec2) bool

Returns true when given point is within rectangle of this object.

type Pos3D 

type Pos3D struct {
	Pos, Size, Scale, RotPoint, Rot Vec3
	Visible                         bool
	M                               Mat4
}

Position component for 3D objects

func NewPos3D 

func NewPos3D() *Pos3D

Creates a default initialized Pos3D.

func (*Pos3D) CalcModel 

func (p *Pos3D) CalcModel() *Mat4

Calculates model matrix for 3D positioning.

func (*Pos3D) GetCenter 

func (p *Pos3D) GetCenter() Vec3

Returns the center of object. Assumes y = 0 is bottom left corner, if not you have to subtract height of object.

type Res 

type Res interface {
	GetName() string
	SetName(string)
	GetPath() string
	SetPath(string)
	GetExt() string
	SetExt(string)
}

A generic resource. Must be cast to appropriate type. The name is the file name and must be unique.

func GetResByName 

func GetResByName(name string) Res

Returns a resource by name or nil, if not found.

func GetResByPath 

func GetResByPath(path string) Res

Returns a resource by path or nil, if not found.

func LoadRes 

func LoadRes(path string) (Res, error)

Loads a resource by file path. If no loader is present for given file, an error will be returned. If the loader fails to load the resource, an error will be returned. If the resource name exists already, an error AND the resource will be returned. This is allows to cleanup on failure.

type ResLoader 

type ResLoader interface {
	Load(string) (Res, error)
	Ext() string
}

Resource loader interface. The loader accepts files by file extension. and loads them if accepted.

func GetLoaderByExt 

func GetLoaderByExt(ext string) ResLoader

Returns a loader by file extension. If not found, nil will be returned.

type ResizeCallback 

type ResizeCallback func(width, height int)

If set in RunOptions, the function will be called on window resize.

type RunOptions 

type RunOptions struct {
	Title               string
	Width               uint32
	Height              uint32
	ClearColor          Vec4
	Resizable           bool
	SetViewportOnResize bool
	ResizeCallbackFunc  ResizeCallback
	ExitOnClose         bool
	RefreshRate         int
	Fullscreen          bool
	MonitorId           uint // index
}

Run options allow to set some parameters on startup.

type Scene 

type Scene interface {
	Pause()
	Resume()
	Cleanup()
	Resize(int, int)
	GetName() string
}

A scene used to switch between game states. The Cleanup() method is called when a scene is removed or the program is stopped. It can be used to cleanup open resources (like GL objects). On switch, Pause() and Resume() are called. The name returned by GetName() must be unique. A scene must only be registered once.

func GetActiveScene 

func GetActiveScene() Scene

Returns the currently active scene. Can be nil if no scene was set.

func GetSceneByName 

func GetSceneByName(name string) Scene

Finds and returns a scene by name, or nil if not found.

type Shader 

type Shader struct {
	// contains filtered or unexported fields
}

Combination of shaders and shader program.

func NewShader 

func NewShader(vertexShader, fragmentShader string) (*Shader, error)

Creates a new shader program by given vertex and fragment shader source code. The shaders itself will be deleted when compiled, only the program ID will be kept.

func (*Shader) Bind 

func (s *Shader) Bind()

Binds the shader for usage.

func (*Shader) BindAttrib 

func (s *Shader) BindAttrib(name string)

Binds an attribute to this shader (with default index), name must be present in shader source.

func (*Shader) BindAttribIndex 

func (s *Shader) BindAttribIndex(name string, index uint32)

Binds an attribute to this shader, name must be present in shader source.

func (*Shader) DisableVertexAttribArrays 

func (s *Shader) DisableVertexAttribArrays()

Disables all bound attributes.

func (*Shader) Drop 

func (s *Shader) Drop()

Deletes the GL program object.

func (*Shader) EnableVertexAttribArrays 

func (s *Shader) EnableVertexAttribArrays()

Enables all bound attributes.

func (*Shader) GetAttribLocation 

func (s *Shader) GetAttribLocation(name string) int32

Returns the location of an attribute. The name must be present in the shader source.

func (*Shader) GetFragmentId 

func (s *Shader) GetFragmentId() uint32

Returns the fragment shader GL ID.

func (*Shader) GetProgramId 

func (s *Shader) GetProgramId() uint32

Retuns the program GL ID.

func (*Shader) GetUniformLocation 

func (s *Shader) GetUniformLocation(name string) int32

Returns the uniform location of a variable. The name must be present in the shader source.

func (*Shader) GetVertexId 

func (s *Shader) GetVertexId() uint32

Returns the vertex shader GL ID.

func (*Shader) SendMat3 

func (s *Shader) SendMat3(name string, m Mat3)

func (*Shader) SendMat4 

func (s *Shader) SendMat4(name string, m Mat4)

func (*Shader) SendUniform1f 

func (s *Shader) SendUniform1f(name string, v float32)

func (*Shader) SendUniform1fv 

func (s *Shader) SendUniform1fv(name string, count int32, data *float32)

func (*Shader) SendUniform1i 

func (s *Shader) SendUniform1i(name string, v int32)

func (*Shader) SendUniform1iv 

func (s *Shader) SendUniform1iv(name string, count int32, data *int32)

func (*Shader) SendUniform2f 

func (s *Shader) SendUniform2f(name string, v0, v1 float32)

func (*Shader) SendUniform2fv 

func (s *Shader) SendUniform2fv(name string, count int32, data *float32)

func (*Shader) SendUniform2i 

func (s *Shader) SendUniform2i(name string, v0, v1 int32)

func (*Shader) SendUniform2iv 

func (s *Shader) SendUniform2iv(name string, count int32, data *int32)

func (*Shader) SendUniform2x2 

func (s *Shader) SendUniform2x2(name string, data *float32, count int32, transpose bool)

func (*Shader) SendUniform2x3 

func (s *Shader) SendUniform2x3(name string, data *float32, count int32, transpose bool)

func (*Shader) SendUniform2x4 

func (s *Shader) SendUniform2x4(name string, data *float32, count int32, transpose bool)

func (*Shader) SendUniform3f 

func (s *Shader) SendUniform3f(name string, v0, v1, v2 float32)

func (*Shader) SendUniform3fv 

func (s *Shader) SendUniform3fv(name string, count int32, data *float32)

func (*Shader) SendUniform3i 

func (s *Shader) SendUniform3i(name string, v0, v1, v2 int32)

func (*Shader) SendUniform3iv 

func (s *Shader) SendUniform3iv(name string, count int32, data *int32)

func (*Shader) SendUniform3x2 

func (s *Shader) SendUniform3x2(name string, data *float32, count int32, transpose bool)

func (*Shader) SendUniform3x3 

func (s *Shader) SendUniform3x3(name string, data *float32, count int32, transpose bool)

func (*Shader) SendUniform3x4 

func (s *Shader) SendUniform3x4(name string, data *float32, count int32, transpose bool)

func (*Shader) SendUniform4f 

func (s *Shader) SendUniform4f(name string, v0, v1, v2, v3 float32)

func (*Shader) SendUniform4fv 

func (s *Shader) SendUniform4fv(name string, count int32, data *float32)

func (*Shader) SendUniform4i 

func (s *Shader) SendUniform4i(name string, v0, v1, v2, v3 int32)

func (*Shader) SendUniform4iv 

func (s *Shader) SendUniform4iv(name string, count int32, data *int32)

func (*Shader) SendUniform4x2 

func (s *Shader) SendUniform4x2(name string, data *float32, count int32, transpose bool)

func (*Shader) SendUniform4x3 

func (s *Shader) SendUniform4x3(name string, data *float32, count int32, transpose bool)

func (*Shader) SendUniform4x4 

func (s *Shader) SendUniform4x4(name string, data *float32, count int32, transpose bool)

func (*Shader) Unbind 

func (s *Shader) Unbind()

Unbinds shader.

type Sprite 

type Sprite struct {
	*Actor
	*Pos2D
	*Tex
}

Sprite is an actor having a 2D position and a texture.

func NewSprite 

func NewSprite(tex *Tex) *Sprite

Creates a new sprite with given texture.

type SpriteRenderer 

type SpriteRenderer struct {
	Pos2D

	Shader *Shader
	Camera *Camera
	// contains filtered or unexported fields
}

The sprite renderer is a system rendering sprites. It has a 2D position component, to move all sprites at once.

func GetSpriteRenderer 

func GetSpriteRenderer() *SpriteRenderer

func NewSpriteRenderer 

func NewSpriteRenderer(shader *Shader, camera *Camera, flip bool) *SpriteRenderer

Creates a new sprite renderer using given shader and camera. If shader and/or camera are nil, the default one will be used.

func (*SpriteRenderer) Add 

func (s *SpriteRenderer) Add(actor *Actor, pos *Pos2D, tex *Tex) bool

Adds sprite to the renderer.

func (*SpriteRenderer) Cleanup 

func (s *SpriteRenderer) Cleanup()

Frees recources created by sprite renderer. This is called automatically when system gets removed.

func (*SpriteRenderer) GetName 

func (s *SpriteRenderer) GetName() string

func (*SpriteRenderer) Len 

func (s *SpriteRenderer) Len() int

Returns number of sprites.

func (*SpriteRenderer) Remove 

func (s *SpriteRenderer) Remove(actor *Actor) bool

Removes sprite from renderer.

func (*SpriteRenderer) RemoveAll 

func (s *SpriteRenderer) RemoveAll()

Removes all sprites from renderer.

func (*SpriteRenderer) RemoveById 

func (s *SpriteRenderer) RemoveById(id ActorId) bool

Removes sprite from renderer by ID.

func (*SpriteRenderer) Update 

func (s *SpriteRenderer) Update(delta float64)

Render sprites.

type System 

type System interface {
	Update(float64)
	Cleanup()
	Remove(*Actor) bool
	RemoveById(ActorId) bool
	RemoveAll()
	Len() int
	GetName() string
}

A system provides logic for actors satisfying required components. They are automatically updated on each frame. When a system is removed from systems, the Cleanup() method will be called. This will also happen on program stop. It can be used to cleanup open resources (like GL objects).

func GetSystemByName 

func GetSystemByName(name string) System

Finds and returns a system by name, or nil if not found.

type Tex 

type Tex struct {
	// contains filtered or unexported fields
}

Texture object.

func GetTex 

func GetTex(name string) (*Tex, error)

Finds and returns a Tex resource. If not found or when the resource is of wrong type, an error will be returned.

func NewTex 

func NewTex(target uint32) *Tex

Creates a new texture for given target (e.g. GL_TEXTURE_2D).

func (*Tex) Bind 

func (t *Tex) Bind()

Binds the texture for rendering.

func (*Tex) Drop 

func (t *Tex) Drop()

Drops the texture.

func (*Tex) GetExt 

func (t *Tex) GetExt() string

Returns the file extension of this resource.

func (*Tex) GetId 

func (t *Tex) GetId() uint32

Returns the GL ID.

func (*Tex) GetName 

func (t *Tex) GetName() string

Returns the name of this resource.

func (*Tex) GetPath 

func (t *Tex) GetPath() string

Returns the path of this resource.

func (*Tex) GetRGBA 

func (t *Tex) GetRGBA() *image.RGBA

Returns the pixel data.

func (*Tex) GetSize 

func (t *Tex) GetSize() Vec3

Returns the size of this texture.

func (*Tex) GetTarget 

func (t *Tex) GetTarget() uint32

Returns the texture target

func (*Tex) Parameterf 

func (t *Tex) Parameterf(name uint32, param float32)

Sets float parameter.

func (*Tex) Parameteri 

func (t *Tex) Parameteri(name uint32, param int32)

Sets integer parameter.

func (*Tex) SetActiveTexture 

func (t *Tex) SetActiveTexture(activeTexture uint32)

Sets which texture boundary is used when bound for rendering. Can be GL_TEXTURE0, GL_TEXTURE1, ... GL_TEXTUREn.

func (*Tex) SetDefaultParams 

func (t *Tex) SetDefaultParams(filter int32)

Sets the default parameters, which are passed filter and CLAMP_TO_EDGE.

func (*Tex) SetExt 

func (t *Tex) SetExt(ext string)

Sets the file extension of this resource.

func (*Tex) SetName 

func (t *Tex) SetName(name string)

Sets the name of this resource.

func (*Tex) SetPath 

func (t *Tex) SetPath(path string)

Sets the path of this resource.

func (*Tex) SetRGBA 

func (t *Tex) SetRGBA(rgba *image.RGBA)

Sets pixel data.

func (*Tex) Texture1D 

func (t *Tex) Texture1D(level, internalFormat, width int32, format, ttype uint32, data []uint8)

Creates a new 1D texture.

func (*Tex) Texture2D 

func (t *Tex) Texture2D(level, internalFormat, width, height int32, format, ttype uint32, data []uint8)

Creates a new 2D texture.

func (*Tex) Texture3D 

func (t *Tex) Texture3D(level, internalFormat, width, height, depth int32, format, ttype uint32, data []uint8)

Creates a new 3D texture.

func (*Tex) Unbind 

func (t *Tex) Unbind()

Unbinds.

type Text 

type Text struct {
	*Actor
	*Pos2D
	*TextComponent
}

Text is an actor representing text rendered as texture mapped font. Each Text has a position and its own buffers.

func NewText 

func NewText(font *Font, textStr string) *Text

Returns a new renderable text object.

func (*Text) GetBounds 

func (t *Text) GetBounds() Vec2

Returns bounds of text, which is the size of characters.

func (*Text) GetText 

func (t *Text) GetText() string

Returns the text as string.

func (*Text) SetText 

func (t *Text) SetText(font *Font, text string)

Sets the given string as text and (re)creates buffers.

type TextComponent 

type TextComponent struct {
	Color Vec4
	// contains filtered or unexported fields
}

Renderable text component. Use together with Text and create using NewText().

func (*TextComponent) Drop 

func (t *TextComponent) Drop()

Deletes GL buffers bound to this text component.

type TextRenderer 

type TextRenderer struct {
	Pos2D

	Shader *Shader
	Camera *Camera
	Font   *Font
	// contains filtered or unexported fields
}

The text renderer is a system rendering 2D texture mapped font. It has a 2D position component, to move all texts at once.

func GetTextRenderer 

func GetTextRenderer() *TextRenderer

func NewTextRenderer 

func NewTextRenderer(shader *Shader, camera *Camera, font *Font) *TextRenderer

Creates a new text renderer using given shader, camera and font. If shader and/or camera are nil, the default one will be used.

func (*TextRenderer) Add 

func (r *TextRenderer) Add(actor *Actor, pos *Pos2D, text *TextComponent) bool

Adds text to the renderer.

func (*TextRenderer) Cleanup 

func (r *TextRenderer) Cleanup()

Frees recources created by text component. This is called automatically when system gets removed.

func (*TextRenderer) GetName 

func (r *TextRenderer) GetName() string

func (*TextRenderer) Len 

func (r *TextRenderer) Len() int

Returns number of texts.

func (*TextRenderer) Prepare 

func (r *TextRenderer) Prepare(text *Text)

Prepares given text for rendering.

func (*TextRenderer) Remove 

func (r *TextRenderer) Remove(actor *Actor) bool

Removes text from renderer.

func (*TextRenderer) RemoveAll 

func (r *TextRenderer) RemoveAll()

Removes all texts.

func (*TextRenderer) RemoveById 

func (r *TextRenderer) RemoveById(id ActorId) bool

Removes text from renderer by ID.

func (*TextRenderer) Update 

func (r *TextRenderer) Update(delta float64)

Renders texts.

type VAO 

type VAO struct {
	// contains filtered or unexported fields
}

Vertex Array Object.

func NewVAO 

func NewVAO() *VAO

Creates a new VAO. Bind and use VBOs for rendering later.

func (*VAO) Bind 

func (v *VAO) Bind()

Binds VAO for rendering.

func (*VAO) Drop 

func (v *VAO) Drop()

Drops this VAO.

func (*VAO) GetId 

func (v *VAO) GetId() uint32

Returns the GL ID.

func (*VAO) Unbind 

func (v *VAO) Unbind()

Unbinds.

type VBO 

type VBO struct {
	// contains filtered or unexported fields
}

Vertex Buffer Object.

func NewVBO 

func NewVBO(target uint32) *VBO

Creates a new VBO with given target.

func (*VBO) AttribPointer 

func (v *VBO) AttribPointer(attribLocation int32, size int32, btype uint32, normalized bool, stride int32)

Sets the attribute pointer for rendering. Used together with shader.

func (*VBO) Bind 

func (v *VBO) Bind()

Binds VBO for rendering.

func (*VBO) Drop 

func (v *VBO) Drop()

Drops this VBO.

func (*VBO) Fill 

func (v *VBO) Fill(data unsafe.Pointer, elements, size int, use uint32)

Fills VBO with data. An unsafe pointer must be used out of Gos unsafe package.

func (*VBO) GetId 

func (v *VBO) GetId() uint32

Returns the GL ID.

func (*VBO) GetTarget 

func (v *VBO) GetTarget() uint32

Returns the target.

func (*VBO) Size 

func (v *VBO) Size() int32

Returns the number of elements within this VBO.

func (*VBO) Unbind 

func (v *VBO) Unbind()

Unbinds.

func (*VBO) Update 

func (v *VBO) Update(data unsafe.Pointer, elements, offset, size int)

Updates data or part of data. An unsafe pointer must be used out of Gos unsafe package.

type Vec2 

type Vec2 struct {
	X, Y float64
}

A 2D vector.

func (*Vec2) Add 

func (v *Vec2) Add(vec Vec2)

Adds and saves the given vector to actual vector.

func (*Vec2) Copy 

func (v *Vec2) Copy() Vec2

Creates a copy of actual vector.

func (*Vec2) Div 

func (v *Vec2) Div(vec Vec2)

Divides and saves the given vector to actual vector.

func (*Vec2) Dot 

func (v *Vec2) Dot() float64

Calculates and returns the dot product of actual vector.

func (*Vec2) DotVec 

func (v *Vec2) DotVec(vec Vec2) float64

Calculates and returns the dot product of combination of given vector and actual vector.

func (*Vec2) Length 

func (v *Vec2) Length() float64

Returns the length of actual vector.

func (*Vec2) Mult 

func (v *Vec2) Mult(vec Vec2)

Multiplies and saves the given vector to actual vector.

func (*Vec2) Normalize 

func (v *Vec2) Normalize()

Normalizes actual vector to length 1.

func (*Vec2) Sub 

func (v *Vec2) Sub(vec Vec2)

Subtracts and saves the given vector to actual vector.

type Vec3 

type Vec3 struct {
	X, Y, Z float64
}

A 3D vector.

func CrossVec3 

func CrossVec3(a, b Vec3) Vec3

Calulates the cross product of given vectors and returns result as a new vector.

func (*Vec3) Add 

func (v *Vec3) Add(vec Vec3)

Adds and saves the given vector to actual vector.

func (*Vec3) Copy 

func (v *Vec3) Copy() Vec3

Creates a copy of actual vector.

func (*Vec3) Cross 

func (v *Vec3) Cross(vec Vec3)

Calculates and saves cross product of given and actual vector.

func (*Vec3) Div 

func (v *Vec3) Div(vec Vec3)

Divides and saves the given vector to actual vector.

func (*Vec3) Dot 

func (v *Vec3) Dot() float64

Calculates and returns the dot product of actual vector.

func (*Vec3) DotVec 

func (v *Vec3) DotVec(vec Vec3) float64

Calculates and returns the dot product of combination of given vector and actual vector.

func (*Vec3) Length 

func (v *Vec3) Length() float64

Returns the length of actual vector.

func (*Vec3) Mult 

func (v *Vec3) Mult(vec Vec3)

Multiplies and saves the given vector to actual vector.

func (*Vec3) Normalize 

func (v *Vec3) Normalize()

Normalizes actual vector to length 1.

func (*Vec3) Sub 

func (v *Vec3) Sub(vec Vec3)

Subtracts and saves the given vector to actual vector.

type Vec4 

type Vec4 struct {
	X, Y, Z, W float64
}

A 4D vector.

func (*Vec4) Add 

func (v *Vec4) Add(vec Vec4)

Adds and saves the given vector to actual vector.

func (*Vec4) Copy 

func (v *Vec4) Copy() Vec4

Creates a copy of actual vector.

func (*Vec4) Div 

func (v *Vec4) Div(vec Vec4)

Divides and saves the given vector to actual vector.

func (*Vec4) Dot 

func (v *Vec4) Dot() float64

Calculates and returns the dot product of actual vector.

func (*Vec4) DotVec 

func (v *Vec4) DotVec(vec Vec4) float64

Calculates and returns the dot product of combination of given vector and actual vector.

func (*Vec4) Length 

func (v *Vec4) Length() float64

Returns the length of actual vector.

func (*Vec4) Mult 

func (v *Vec4) Mult(vec Vec4)

Multiplies and saves the given vector to actual vector.

func (*Vec4) Normalize 

func (v *Vec4) Normalize()

Normalizes actual vector to length 1.

func (*Vec4) Sub 

func (v *Vec4) Sub(vec Vec4)

Subracts and saves the given vector to actual vector.

Source Files

View all Source files

Directories

Path Synopsis
demo
input
keyframe
model
sprite
text

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