gfx

package
v0.3.24 Latest Latest
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 Go to latest Published: Oct 11, 2021 License: MIT Imports: 23 Imported by: 0

Documentation

Overview

Package gfx is a thin abstraction layer for OpenGL.

Index

Constants

This section is empty.

Variables

View Source 
var (
	// FrameSync is an internal variable.
	FrameSync = make(chan chan struct{}, 1)
)
View Source 
var GL gl.Context

GL is the OpenGL context.

View Source 
var Lock sync.Mutex

Lock should be held whenever an operation depends on or modifies global OpenGL state.

Functions

func Do added in v0.3.19 

func Do(f func())

func HorizontalFOV added in v0.3.12 

func HorizontalFOV(angle float64) float32

func Init 

func Init(ctx gl.Context)

Init is an internal function that sets up the context.

func InvalidateFramebuffer added in v0.3.24 

func InvalidateFramebuffer(fb, reset gl.Framebuffer, attachments ...gl.Enum)

func NextFrame 

func NextFrame() bool

NextFrame synchronizes a frame boundary.

func PixelSize added in v0.3.6 

func PixelSize() (w, h int)

PixelSize returns the screen size without compensation for pixel density.

func Release added in v0.2.70 

func Release()

Release is an internal function that shuts down the context.

func SetSize 

func SetSize(e size.Event)

SetSize processes a size.Event.

func Size 

func Size() (w, h int)

Size returns the current screen size.

func StatRecordBufferData added in v0.3.4 

func StatRecordBufferData(count int)

func StatRecordTextureUse added in v0.3.4 

func StatRecordTextureUse(tex *AssetTexture)

func StatRecordTriangleBatch added in v0.3.4 

func StatRecordTriangleBatch(points int)

func TexStorage2D added in v0.3.22 

func TexStorage2D(target gl.Enum, levels int, format, ty, sizedformat gl.Enum, width, height int)

Types

type AssetTexture added in v0.2.72 

type AssetTexture struct {
	Name      string
	DownScale int

	NoClamp bool
	// contains filtered or unexported fields
}

AssetTexture is a lazy-loaded texture.

func BlankAssetTexture added in v0.2.75 

func BlankAssetTexture() *AssetTexture

BlankAssetTexture returns a 1x1 white square.

func DummyAssetTexture added in v0.3.5 

func DummyAssetTexture(name string, tex gl.Texture) *AssetTexture

func NewAssetTexture added in v0.2.72 

func NewAssetTexture(name string, nearest, noMip bool) *AssetTexture

NewAssetTexture creates a lazy-loaded texture from an asset.

func NewCachedAssetTexture added in v0.2.75 

func NewCachedAssetTexture(name string) *AssetTexture

NewCachedAssetTexture creates a lazy-loaded texture from an asset.

func NewEmbeddedTexture added in v0.2.75 

func NewEmbeddedTexture(name string, nearest, noMip bool, data []byte, mimeType string, premultiplyAlpha bool) *AssetTexture

NewEmbeddedTexture creates an AssetTexture that loads from memory.

func (*AssetTexture) LazyTexture added in v0.2.73 

func (a *AssetTexture) LazyTexture(def gl.Texture) gl.Texture

LazyTexture loads the texture and returns the texture handle.

func (*AssetTexture) Preload added in v0.2.72 

func (a *AssetTexture) Preload() error

Preload loads the texture and returns any error encountered.

func (*AssetTexture) Ready added in v0.3.10 

func (a *AssetTexture) Ready() bool

func (*AssetTexture) Release added in v0.2.73 

func (a *AssetTexture) Release()

Release deletes the texture handle.

func (*AssetTexture) StartPreload added in v0.3.7 

func (a *AssetTexture) StartPreload()

StartPreload is a convenience function that calls Preload in a new goroutine.

func (*AssetTexture) Texture added in v0.2.72 

func (a *AssetTexture) Texture() gl.Texture

Texture loads the texture and returns the texture handle.

type Attrib added in v0.2.70 

type Attrib struct {
	Attrib gl.Attrib
	Name   string
	// contains filtered or unexported fields
}

Attrib is a vertex attribute.

type Camera 

type Camera struct {
	Offset      Matrix
	Rotation    Matrix
	Position    Matrix
	Perspective Matrix

	Invert bool
	// contains filtered or unexported fields
}

Camera tracks the position and orientation of the 3D camera.

func (*Camera) Combined 

func (c *Camera) Combined(m *Matrix)

Combined returns the combined transformation matrix.

func (*Camera) MarkDirty added in v0.3.15 

func (c *Camera) MarkDirty()

func (*Camera) PopTransform 

func (c *Camera) PopTransform()

PopTransform removes the last transform added via PushTransform.

func (*Camera) PushTransform 

func (c *Camera) PushTransform(m *Matrix)

PushTransform adds a transform to the transform stack.

func (*Camera) PushTranslation added in v0.3.7 

func (c *Camera) PushTranslation(x, y, z float32)

PushTranslation is a helper function to push a translation-based transform to the stack.

func (*Camera) SetDefaults 

func (c *Camera) SetDefaults()

SetDefaults sets the Matrix fields in Camera to default values.

type CustomInit added in v0.2.70 

type CustomInit struct {
	Name string
	// contains filtered or unexported fields
}

CustomInit is a custom OpenGL init/release function pair.

func Custom added in v0.2.70 

func Custom(name string, init, release func()) *CustomInit

Custom registers a CustomInit. 

type ErrShaderLink struct {
	Name string
	Vert string
	Frag string
	Link string

	Message string
	Extra   string
}

func (ErrShaderLink) Error added in v0.3.7 

func (err ErrShaderLink) Error() string

type GPUPowerLevel added in v0.3.18 

type GPUPowerLevel int
const (
	GPULow    GPUPowerLevel = 0
	GPUMedium GPUPowerLevel = 1
	GPUHigh   GPUPowerLevel = 2
)

Constants for GPUPowerLevel. 

var GPULevel GPUPowerLevel = -1

GPULevel is 0, 1, or 2, for low-, medium-, or high-powered GPUs.

type Matrix 

type Matrix [16]float32

Matrix is a 4x4 transformation matrix.

func (*Matrix) Determinant added in v0.3.22 

func (m *Matrix) Determinant() float32

func (*Matrix) FunHouse added in v0.3.22 

func (m *Matrix) FunHouse(x, y, divisor, falloff, offX, offY, scale, hover float32)

func (*Matrix) Identity added in v0.3.7 

func (m *Matrix) Identity()

Identity returns the identity matrix.

func (*Matrix) Inverse added in v0.3.22 

func (m *Matrix) Inverse(m0 *Matrix) bool

Inverse computes the inverse of the matrix.

This function's implementation is based on the implementation from Mesa3D, contributed by Jacques Leroy.

func (*Matrix) Multiply added in v0.3.7 

func (m *Matrix) Multiply(m0, m1 *Matrix)

Multiply multiplies a matrix by a matrix.

func (*Matrix) Perspective added in v0.3.7 

func (m *Matrix) Perspective(fov, aspect, nearZ, farZ float32)

Perspective constructs a perspective matrix.

func (*Matrix) RotationX added in v0.3.7 

func (m *Matrix) RotationX(r float32)

RotationX constructs a rotation matrix over the X axis.

func (*Matrix) RotationXYZ added in v0.3.22 

func (m *Matrix) RotationXYZ(x, y, z float32)

RotationXYZ constructs a rotation matrix over euler angles.

func (*Matrix) RotationY added in v0.3.7 

func (m *Matrix) RotationY(r float32)

RotationY constructs a rotation matrix over the Y axis.

func (*Matrix) RotationZ added in v0.3.7 

func (m *Matrix) RotationZ(r float32)

RotationZ constructs a rotation matrix over the Z axis.

func (*Matrix) Scale added in v0.3.7 

func (m *Matrix) Scale(x, y, z float32)

Scale constructs a scaling matrix.

func (*Matrix) Translation added in v0.3.7 

func (m *Matrix) Translation(x, y, z float32)

Translation constructs translation matrix.

type Program added in v0.2.70 

type Program struct {
	Name string

	Program gl.Program
	// contains filtered or unexported fields
}

Program is an OpenGL shader.

func Shader added in v0.2.70 

func Shader(name, vertex2, fragment2, vertex3, fragment3 string) *Program

Shader registers an OpenGL shader.

func (*Program) Attrib added in v0.2.70 

func (p *Program) Attrib(name string) *Attrib

Attrib gets the location of a vertex attribute.

func (*Program) Uniform added in v0.2.70 

func (p *Program) Uniform(name string) *Uniform

Uniform gets the location of a global variable.

type StaticBuffer 

type StaticBuffer struct {
	Name string

	Data    gl.Buffer
	Element gl.Buffer
	VAO     gl.VertexArray
	Count   int

	SetPointers    func()
	DisableAttribs func()
	// contains filtered or unexported fields
}

StaticBuffer is a convenience layer for OpenGL vertex buffer objects.

func NewStaticBuffer 

func NewStaticBuffer(name string, data, elements []uint8, elementSize int, setPointers, disableAttribs func()) *StaticBuffer

NewStaticBuffer creates a StaticBuffer.

func (*StaticBuffer) Bind added in v0.3.19 

func (sb *StaticBuffer) Bind()

func (*StaticBuffer) Delete 

func (sb *StaticBuffer) Delete()

Delete frees the GPU memory held by StaticBuffer and removes it from the list of buffers.

func (*StaticBuffer) Unbind added in v0.3.19 

func (sb *StaticBuffer) Unbind()

type Texture added in v0.2.70 

type Texture struct {
	Name    string
	Texture gl.Texture
	// contains filtered or unexported fields
}

Texture is an OpenGL texture.

func NewTexture added in v0.2.70 

func NewTexture(name string, img image.Image, nearest, noMip, noClamp, premultiplyAlpha bool) *Texture

NewTexture creates a texture.

func (*Texture) Release added in v0.2.73 

func (t *Texture) Release()

Release deletes a texture handle.

type Uniform added in v0.2.70 

type Uniform struct {
	Uniform gl.Uniform
	Name    string
	// contains filtered or unexported fields
}

Uniform is a global variable.

type Vector 

type Vector [4]float32

Vector is a 4-component geometric vector of (x, y, z, w).

w should be 1 for absolute vectors like position and 0 for relative vectors like normal.

func (*Vector) Multiply added in v0.3.7 

func (v *Vector) Multiply(m *Matrix, v0 *Vector)

Multiply multiplies a matrix by a vector.

Source Files

View all Source files

Directories

Path Synopsis
Package crt renders a screen-space CRT monitor effect.
 Package crt renders a screen-space CRT monitor effect.
Package sprites handles loading and rendering sprites.
 Package sprites handles loading and rendering sprites.
internal/gentext
internal/splitsheet

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