fauxgl

package module
v0.0.0-...-27cddc1 Latest Latest
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 Go to latest Published: Aug 18, 2020 License: MIT Imports: 18 Imported by: 241

README

FauxGL

3D software rendering in pure Go. No OpenGL, no C extensions, no nothin'.


Dragon

About

It's like OpenGL, but it's not. It's FauxGL.

It doesn't use your graphics card, only your CPU. So it's slow and unsuitable for realtime rendering. But it's still pretty fast. It works the same way OpenGL works - rasterizing.

Features
  • STL, OBJ, PLY, 3DS file formats
  • triangle rasterization
  • vertex and fragment "shaders"
  • view volume clipping
  • face culling
  • alpha blending
  • textures
  • triangle & line meshes
  • depth biasing
  • wireframe rendering
  • built-in shapes (plane, sphere, cube, cylinder, cone)
  • anti-aliasing (via supersampling)
  • voxel rendering
  • parallel processing
Performance

FauxGL uses all of your CPU cores. But none of your GPU.

Rendering the Stanford Dragon shown above (871306 triangles) at 1920x1080px takes about 150 milliseconds on my machine. With 4x4=16x supersampling, it takes about 950 milliseconds. This is the time to render a frame and does not include loading the mesh from disk.

Go Get
go get -u github.com/fogleman/fauxgl
Go Run
cd go/src/github.com/fogleman/fauxgl
go run examples/hello.go
Go Doc

https://godoc.org/github.com/fogleman/fauxgl

Complete Example
package main

import (
	. "github.com/fogleman/fauxgl"
	"github.com/nfnt/resize"
)

const (
	scale  = 1    // optional supersampling
	width  = 1920 // output width in pixels
	height = 1080 // output height in pixels
	fovy   = 30   // vertical field of view in degrees
	near   = 1    // near clipping plane
	far    = 10   // far clipping plane
)

var (
	eye    = V(-3, 1, -0.75)               // camera position
	center = V(0, -0.07, 0)                // view center position
	up     = V(0, 1, 0)                    // up vector
	light  = V(-0.75, 1, 0.25).Normalize() // light direction
	color  = HexColor("#468966")           // object color
)

func main() {
	// load a mesh
	mesh, err := LoadOBJ("examples/dragon.obj")
	if err != nil {
		panic(err)
	}

	// fit mesh in a bi-unit cube centered at the origin
	mesh.BiUnitCube()

	// smooth the normals
	mesh.SmoothNormalsThreshold(Radians(30))

	// create a rendering context
	context := NewContext(width*scale, height*scale)
	context.ClearColorBufferWith(HexColor("#FFF8E3"))

	// create transformation matrix and light direction
	aspect := float64(width) / float64(height)
	matrix := LookAt(eye, center, up).Perspective(fovy, aspect, near, far)

	// use builtin phong shader
	shader := NewPhongShader(matrix, light, eye)
	shader.ObjectColor = color
	context.Shader = shader

	// render
	context.DrawMesh(mesh)

	// downsample image for antialiasing
	image := context.Image()
	image = resize.Resize(width, height, image, resize.Bilinear)

	// save image
	SavePNG("out.png", image)
}

Teapot

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	Discard     = Color{}
	Transparent = Color{}
	Black       = Color{0, 0, 0, 1}
	White       = Color{1, 1, 1, 1}
)
View Source 
var EmptyBox = Box{}

Functions

func AbsInt 

func AbsInt(x int) int

func Clamp 

func Clamp(x, lo, hi float64) float64

func ClampInt 

func ClampInt(x, lo, hi int) int

func Degrees 

func Degrees(radians float64) float64

func InterpolateFloats 

func InterpolateFloats(v1, v2, v3 float64, b VectorW) float64

func LoadImage 

func LoadImage(path string) (image.Image, error)

func ParseFloats 

func ParseFloats(items []string) []float64

func Radians 

func Radians(degrees float64) float64

func Round 

func Round(a float64) int

func RoundPlaces 

func RoundPlaces(a float64, places int) float64

func SavePNG 

func SavePNG(path string, im image.Image) error

func SaveSTL 

func SaveSTL(path string, mesh *Mesh) error

Types

type Box 

type Box struct {
	Min, Max Vector
}

func BoxForBoxes 

func BoxForBoxes(boxes []Box) Box

func (Box) Anchor 

func (a Box) Anchor(anchor Vector) Vector

func (Box) Center 

func (a Box) Center() Vector

func (Box) Contains 

func (a Box) Contains(b Vector) bool

func (Box) ContainsBox 

func (a Box) ContainsBox(b Box) bool

func (Box) Extend 

func (a Box) Extend(b Box) Box

func (Box) Intersection 

func (a Box) Intersection(b Box) Box

func (Box) Intersects 

func (a Box) Intersects(b Box) bool

func (Box) Offset 

func (a Box) Offset(x float64) Box

func (Box) Size 

func (a Box) Size() Vector

func (Box) Transform 

func (a Box) Transform(m Matrix) Box

func (Box) Translate 

func (a Box) Translate(v Vector) Box

func (Box) Volume 

func (a Box) Volume() float64

type Color 

type Color struct {
	R, G, B, A float64
}

func Gray 

func Gray(x float64) Color

func HexColor 

func HexColor(x string) Color

func InterpolateColors 

func InterpolateColors(v1, v2, v3 Color, b VectorW) Color

func MakeColor 

func MakeColor(c color.Color) Color

func (Color) Add 

func (a Color) Add(b Color) Color

func (Color) AddScalar 

func (a Color) AddScalar(b float64) Color

func (Color) Alpha 

func (a Color) Alpha(alpha float64) Color

func (Color) Div 

func (a Color) Div(b Color) Color

func (Color) DivScalar 

func (a Color) DivScalar(b float64) Color

func (Color) Lerp 

func (a Color) Lerp(b Color, t float64) Color

func (Color) Max 

func (a Color) Max(b Color) Color

func (Color) Min 

func (a Color) Min(b Color) Color

func (Color) Mul 

func (a Color) Mul(b Color) Color

func (Color) MulScalar 

func (a Color) MulScalar(b float64) Color

func (Color) NRGBA 

func (c Color) NRGBA() color.NRGBA

func (Color) Opaque 

func (a Color) Opaque() Color

func (Color) Pow 

func (a Color) Pow(b float64) Color

func (Color) Sub 

func (a Color) Sub(b Color) Color

func (Color) SubScalar 

func (a Color) SubScalar(b float64) Color

type Context 

type Context struct {
	Width       int
	Height      int
	ColorBuffer *image.NRGBA
	DepthBuffer []float64
	ClearColor  Color
	Shader      Shader
	ReadDepth   bool
	WriteDepth  bool
	WriteColor  bool
	AlphaBlend  bool
	Wireframe   bool
	FrontFace   Face
	Cull        Cull
	LineWidth   float64
	DepthBias   float64
	// contains filtered or unexported fields
}

func NewContext 

func NewContext(width, height int) *Context

func (*Context) ClearColorBuffer 

func (dc *Context) ClearColorBuffer()

func (*Context) ClearColorBufferWith 

func (dc *Context) ClearColorBufferWith(color Color)

func (*Context) ClearDepthBuffer 

func (dc *Context) ClearDepthBuffer()

func (*Context) ClearDepthBufferWith 

func (dc *Context) ClearDepthBufferWith(value float64)

func (*Context) DepthImage 

func (dc *Context) DepthImage() image.Image

func (*Context) DrawLine 

func (dc *Context) DrawLine(t *Line) RasterizeInfo

func (*Context) DrawLines 

func (dc *Context) DrawLines(lines []*Line) RasterizeInfo

func (*Context) DrawMesh 

func (dc *Context) DrawMesh(mesh *Mesh) RasterizeInfo

func (*Context) DrawTriangle 

func (dc *Context) DrawTriangle(t *Triangle) RasterizeInfo

func (*Context) DrawTriangles 

func (dc *Context) DrawTriangles(triangles []*Triangle) RasterizeInfo

func (*Context) Image 

func (dc *Context) Image() image.Image

type Cull 

type Cull int
const (
	CullNone Cull
	CullFront
	CullBack
)

type Face 

type Face int
const (
	FaceCW Face
	FaceCCW
)

type ImageTexture 

type ImageTexture struct {
	Width  int
	Height int
	Image  image.Image
}

func (*ImageTexture) BilinearSample 

func (t *ImageTexture) BilinearSample(u, v float64) Color

func (*ImageTexture) Sample 

func (t *ImageTexture) Sample(u, v float64) Color

type Line 

type Line struct {
	V1, V2 Vertex
}

func ClipLine 

func ClipLine(l *Line) *Line

func NewLine 

func NewLine(v1, v2 Vertex) *Line

func NewLineForPoints 

func NewLineForPoints(p1, p2 Vector) *Line

func (*Line) BoundingBox 

func (l *Line) BoundingBox() Box

func (*Line) Transform 

func (l *Line) Transform(matrix Matrix)

type Matrix 

type Matrix struct {
	X00, X01, X02, X03 float64
	X10, X11, X12, X13 float64
	X20, X21, X22, X23 float64
	X30, X31, X32, X33 float64
}

func Frustum 

func Frustum(l, r, b, t, n, f float64) Matrix

func Identity 

func Identity() Matrix

func LookAt 

func LookAt(eye, center, up Vector) Matrix

func LookAtDirection 

func LookAtDirection(forward, up Vector) Matrix

func Orient 

func Orient(position, size, up Vector, rotation float64) Matrix

func Orthographic 

func Orthographic(l, r, b, t, n, f float64) Matrix

func Perspective 

func Perspective(fovy, aspect, near, far float64) Matrix

func Rotate 

func Rotate(v Vector, a float64) Matrix

func RotateTo 

func RotateTo(a, b Vector) Matrix

func Scale 

func Scale(v Vector) Matrix

func Screen 

func Screen(w, h int) Matrix

func Translate 

func Translate(v Vector) Matrix

func Viewport 

func Viewport(x, y, w, h float64) Matrix

func (Matrix) Determinant 

func (a Matrix) Determinant() float64

func (Matrix) Frustum 

func (m Matrix) Frustum(l, r, b, t, n, f float64) Matrix

func (Matrix) Inverse 

func (a Matrix) Inverse() Matrix

func (Matrix) LookAt 

func (m Matrix) LookAt(eye, center, up Vector) Matrix

func (Matrix) Mul 

func (a Matrix) Mul(b Matrix) Matrix

func (Matrix) MulBox 

func (a Matrix) MulBox(box Box) Box

func (Matrix) MulDirection 

func (a Matrix) MulDirection(b Vector) Vector

func (Matrix) MulPosition 

func (a Matrix) MulPosition(b Vector) Vector

func (Matrix) MulPositionW 

func (a Matrix) MulPositionW(b Vector) VectorW

func (Matrix) MulScalar 

func (a Matrix) MulScalar(b float64) Matrix

func (Matrix) Orthographic 

func (m Matrix) Orthographic(l, r, b, t, n, f float64) Matrix

func (Matrix) Perspective 

func (m Matrix) Perspective(fovy, aspect, near, far float64) Matrix

func (Matrix) Rotate 

func (m Matrix) Rotate(v Vector, a float64) Matrix

func (Matrix) RotateTo 

func (m Matrix) RotateTo(a, b Vector) Matrix

func (Matrix) Scale 

func (m Matrix) Scale(v Vector) Matrix

func (Matrix) Translate 

func (m Matrix) Translate(v Vector) Matrix

func (Matrix) Transpose 

func (a Matrix) Transpose() Matrix

func (Matrix) Viewport 

func (m Matrix) Viewport(x, y, w, h float64) Matrix

type Mesh 

type Mesh struct {
	Triangles []*Triangle
	Lines     []*Line
	// contains filtered or unexported fields
}

func Load3DS 

func Load3DS(filename string) (*Mesh, error)

func LoadMesh 

func LoadMesh(path string) (*Mesh, error)

func LoadOBJ 

func LoadOBJ(path string) (*Mesh, error)

func LoadPLY 

func LoadPLY(path string) (*Mesh, error)

func LoadSTL 

func LoadSTL(path string) (*Mesh, error)

func NewCone 

func NewCone(step int, capped bool) *Mesh

func NewCube 

func NewCube() *Mesh

func NewCubeForBox 

func NewCubeForBox(box Box) *Mesh

func NewCubeOutlineForBox 

func NewCubeOutlineForBox(box Box) *Mesh

func NewCylinder 

func NewCylinder(step int, capped bool) *Mesh

func NewEmptyMesh 

func NewEmptyMesh() *Mesh

func NewIcosahedron 

func NewIcosahedron() *Mesh

func NewLatLngSphere 

func NewLatLngSphere(latStep, lngStep int) *Mesh

func NewLineMesh 

func NewLineMesh(lines []*Line) *Mesh

func NewMesh 

func NewMesh(triangles []*Triangle, lines []*Line) *Mesh

func NewPlane 

func NewPlane() *Mesh

func NewSphere 

func NewSphere(detail int) *Mesh

func NewTriangleMesh 

func NewTriangleMesh(triangles []*Triangle) *Mesh

func NewVoxelMesh 

func NewVoxelMesh(voxels []Voxel) *Mesh

func (*Mesh) Add 

func (a *Mesh) Add(b *Mesh)

func (*Mesh) BiUnitCube 

func (m *Mesh) BiUnitCube() Matrix

func (*Mesh) BoundingBox 

func (m *Mesh) BoundingBox() Box

func (*Mesh) Center 

func (m *Mesh) Center() Matrix

func (*Mesh) Copy 

func (m *Mesh) Copy() *Mesh

func (*Mesh) FitInside 

func (m *Mesh) FitInside(box Box, anchor Vector) Matrix

func (*Mesh) MoveTo 

func (m *Mesh) MoveTo(position, anchor Vector) Matrix

func (*Mesh) ReverseWinding 

func (m *Mesh) ReverseWinding()

func (*Mesh) SaveSTL 

func (m *Mesh) SaveSTL(path string) error

func (*Mesh) SetColor 

func (m *Mesh) SetColor(c Color)

func (*Mesh) SharpEdges 

func (m *Mesh) SharpEdges(angleThreshold float64) *Mesh

func (*Mesh) Silhouette 

func (m *Mesh) Silhouette(eye Vector, offset float64) *Mesh

func (*Mesh) Simplify 

func (m *Mesh) Simplify(factor float64)

func (*Mesh) SmoothNormals 

func (m *Mesh) SmoothNormals()

func (*Mesh) SmoothNormalsThreshold 

func (m *Mesh) SmoothNormalsThreshold(radians float64)

func (*Mesh) SplitTriangles 

func (m *Mesh) SplitTriangles(maxEdgeLength float64)

func (*Mesh) SurfaceArea 

func (m *Mesh) SurfaceArea() float64

func (*Mesh) Transform 

func (m *Mesh) Transform(matrix Matrix)

func (*Mesh) UnitCube 

func (m *Mesh) UnitCube() Matrix

func (*Mesh) Volume 

func (m *Mesh) Volume() float64

type PhongShader 

type PhongShader struct {
	Matrix         Matrix
	LightDirection Vector
	CameraPosition Vector
	ObjectColor    Color
	AmbientColor   Color
	DiffuseColor   Color
	SpecularColor  Color
	Texture        Texture
	SpecularPower  float64
}

PhongShader implements Phong shading with an optional texture.

func NewPhongShader 

func NewPhongShader(matrix Matrix, lightDirection, cameraPosition Vector) *PhongShader

func (*PhongShader) Fragment 

func (shader *PhongShader) Fragment(v Vertex) Color

func (*PhongShader) Vertex 

func (shader *PhongShader) Vertex(v Vertex) Vertex

type RasterizeInfo 

type RasterizeInfo struct {
	TotalPixels   uint64
	UpdatedPixels uint64
}

func (RasterizeInfo) Add 

func (info RasterizeInfo) Add(other RasterizeInfo) RasterizeInfo

type STLHeader 

type STLHeader struct {
	Count uint32
	// contains filtered or unexported fields
}

type STLTriangle 

type STLTriangle struct {
	N, V1, V2, V3 [3]float32
	// contains filtered or unexported fields
}

type Shader 

type Shader interface {
	Vertex(Vertex) Vertex
	Fragment(Vertex) Color
}

type SolidColorShader 

type SolidColorShader struct {
	Matrix Matrix
	Color  Color
}

SolidColorShader renders with a single, solid color.

func NewSolidColorShader 

func NewSolidColorShader(matrix Matrix, color Color) *SolidColorShader

func (*SolidColorShader) Fragment 

func (shader *SolidColorShader) Fragment(v Vertex) Color

func (*SolidColorShader) Vertex 

func (shader *SolidColorShader) Vertex(v Vertex) Vertex

type Texture 

type Texture interface {
	Sample(u, v float64) Color
	BilinearSample(u, v float64) Color
}

func LoadTexture 

func LoadTexture(path string) (Texture, error)

func NewImageTexture 

func NewImageTexture(im image.Image) Texture

type TextureShader 

type TextureShader struct {
	Matrix  Matrix
	Texture Texture
}

TextureShader renders with a texture and no lighting.

func NewTextureShader 

func NewTextureShader(matrix Matrix, texture Texture) *TextureShader

func (*TextureShader) Fragment 

func (shader *TextureShader) Fragment(v Vertex) Color

func (*TextureShader) Vertex 

func (shader *TextureShader) Vertex(v Vertex) Vertex

type Triangle 

type Triangle struct {
	V1, V2, V3 Vertex
}

func ClipTriangle 

func ClipTriangle(t *Triangle) []*Triangle

func NewTriangle 

func NewTriangle(v1, v2, v3 Vertex) *Triangle

func NewTriangleForPoints 

func NewTriangleForPoints(p1, p2, p3 Vector) *Triangle

func (*Triangle) Area 

func (t *Triangle) Area() float64

func (*Triangle) BoundingBox 

func (t *Triangle) BoundingBox() Box

func (*Triangle) FixNormals 

func (t *Triangle) FixNormals()

func (*Triangle) IsDegenerate 

func (t *Triangle) IsDegenerate() bool

func (*Triangle) Normal 

func (t *Triangle) Normal() Vector

func (*Triangle) ReverseWinding 

func (t *Triangle) ReverseWinding()

func (*Triangle) SetColor 

func (t *Triangle) SetColor(c Color)

func (*Triangle) Transform 

func (t *Triangle) Transform(matrix Matrix)

type VOXChunk 

type VOXChunk struct {
	ID            [4]byte
	ContentBytes  int32
	ChildrenBytes int32
}

type VOXHeader 

type VOXHeader struct {
	Magic   [4]byte
	Version int32
}

type VOXVoxel 

type VOXVoxel struct {
	X, Y, Z, I uint8
}

type Vector 

type Vector struct {
	X, Y, Z float64
}

func InterpolateVectors 

func InterpolateVectors(v1, v2, v3 Vector, b VectorW) Vector

func LatLngToXYZ 

func LatLngToXYZ(lat, lng float64) Vector

func RandomUnitVector 

func RandomUnitVector() Vector

func V 

func V(x, y, z float64) Vector

func (Vector) Abs 

func (a Vector) Abs() Vector

func (Vector) Add 

func (a Vector) Add(b Vector) Vector

func (Vector) AddScalar 

func (a Vector) AddScalar(b float64) Vector

func (Vector) Ceil 

func (a Vector) Ceil() Vector

func (Vector) Cross 

func (a Vector) Cross(b Vector) Vector

func (Vector) Distance 

func (a Vector) Distance(b Vector) float64

func (Vector) DistanceSquared 

func (a Vector) DistanceSquared(b Vector) float64

func (Vector) Div 

func (a Vector) Div(b Vector) Vector

func (Vector) DivScalar 

func (a Vector) DivScalar(b float64) Vector

func (Vector) Dot 

func (a Vector) Dot(b Vector) float64

func (Vector) Floor 

func (a Vector) Floor() Vector

func (Vector) IsDegenerate 

func (a Vector) IsDegenerate() bool

func (Vector) Length 

func (a Vector) Length() float64

func (Vector) LengthSquared 

func (a Vector) LengthSquared() float64

func (Vector) Lerp 

func (a Vector) Lerp(b Vector, t float64) Vector

func (Vector) LerpDistance 

func (a Vector) LerpDistance(b Vector, d float64) Vector

func (Vector) Less 

func (a Vector) Less(b Vector) bool

func (Vector) Max 

func (a Vector) Max(b Vector) Vector

func (Vector) MaxComponent 

func (a Vector) MaxComponent() float64

func (Vector) Min 

func (a Vector) Min(b Vector) Vector

func (Vector) MinComponent 

func (a Vector) MinComponent() float64

func (Vector) Mod 

func (a Vector) Mod(b Vector) Vector

func (Vector) Mul 

func (a Vector) Mul(b Vector) Vector

func (Vector) MulScalar 

func (a Vector) MulScalar(b float64) Vector

func (Vector) Negate 

func (a Vector) Negate() Vector

func (Vector) Normalize 

func (a Vector) Normalize() Vector

func (Vector) Perpendicular 

func (a Vector) Perpendicular() Vector

func (Vector) Reflect 

func (i Vector) Reflect(n Vector) Vector

func (Vector) Round 

func (a Vector) Round() Vector

func (Vector) RoundPlaces 

func (a Vector) RoundPlaces(n int) Vector

func (Vector) SegmentDistance 

func (p Vector) SegmentDistance(v Vector, w Vector) float64

func (Vector) Sub 

func (a Vector) Sub(b Vector) Vector

func (Vector) SubScalar 

func (a Vector) SubScalar(b float64) Vector

func (Vector) VectorW 

func (a Vector) VectorW() VectorW

type VectorW 

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

func Barycentric 

func Barycentric(p1, p2, p3, p Vector) VectorW

func InterpolateVectorWs 

func InterpolateVectorWs(v1, v2, v3, b VectorW) VectorW

func (VectorW) Add 

func (a VectorW) Add(b VectorW) VectorW

func (VectorW) DivScalar 

func (a VectorW) DivScalar(b float64) VectorW

func (VectorW) Dot 

func (a VectorW) Dot(b VectorW) float64

func (VectorW) MulScalar 

func (a VectorW) MulScalar(b float64) VectorW

func (VectorW) Outside 

func (a VectorW) Outside() bool

func (VectorW) Sub 

func (a VectorW) Sub(b VectorW) VectorW

func (VectorW) Vector 

func (a VectorW) Vector() Vector

type Vertex 

type Vertex struct {
	Position Vector
	Normal   Vector
	Texture  Vector
	Color    Color
	Output   VectorW
}

func InterpolateVertexes 

func InterpolateVertexes(v1, v2, v3 Vertex, b VectorW) Vertex

func (Vertex) Outside 

func (a Vertex) Outside() bool

type Voxel 

type Voxel struct {
	X, Y, Z int
	Color   Color
}

func LoadVOX 

func LoadVOX(path string) ([]Voxel, error)

Source Files

View all Source files

Directories

Path Synopsis
cmd
mesh2stl
meshmontage
meshrepeat
meshsample
meshscale

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