webgl

package
v0.0.0-...-b89353a Latest Latest
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 Go to latest Published: Mar 29, 2015 License: BSD-3-Clause Imports: 5 Imported by: 0

Documentation

Rendered for js/wasm

Index

Constants

This section is empty.

Variables

View Source 
var (
	ErrNoWebGLSupport = errors.New("browser does not support WebGL")
)

Functions

func New 

func New(canvas *js.Object, ca *ContextAttributes) (gfx.Context, error)

New takes an HTML5 canvas object and context attributes (nil for the default ones). If any error is returned, it will be of type ErrNoWebGLSupport

func Wrap 

func Wrap(o *js.Object) gfx.Context

Wrap returns a new WebGL rendering context by wrapping the given JavaScript WebGLRenderingContext object.

Types

type Buffer 

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

Buffer implements the gfx.Buffer interface by wrapping a WebGLBuffer JavaScript object.

func (*Buffer) DataFloat32 

func (b *Buffer) DataFloat32(data []float32, usage gfx.BufferUsage)

DataFloat32 implements the gfx.Buffer interface.

func (*Buffer) DataFloat64 

func (b *Buffer) DataFloat64(data []float64, usage gfx.BufferUsage)

DataFloat64 implements the gfx.Buffer interface.

func (*Buffer) DataInt16 

func (b *Buffer) DataInt16(data []int16, usage gfx.BufferUsage)

DataInt16 implements the gfx.Buffer interface.

func (*Buffer) DataInt32 

func (b *Buffer) DataInt32(data []int32, usage gfx.BufferUsage)

DataInt32 implements the gfx.Buffer interface.

func (*Buffer) DataInt8 

func (b *Buffer) DataInt8(data []int8, usage gfx.BufferUsage)

DataInt8 implements the gfx.Buffer interface.

func (*Buffer) DataSize 

func (b *Buffer) DataSize(size int, usage gfx.BufferUsage)

DataSize implements the gfx.Buffer interface.

func (*Buffer) DataUint16 

func (b *Buffer) DataUint16(data []uint16, usage gfx.BufferUsage)

DataUint16 implements the gfx.Buffer interface.

func (*Buffer) DataUint32 

func (b *Buffer) DataUint32(data []uint32, usage gfx.BufferUsage)

DataUint32 implements the gfx.Buffer interface.

func (*Buffer) DataUint8 

func (b *Buffer) DataUint8(data []uint8, usage gfx.BufferUsage)

DataUint8 implements the gfx.Buffer interface.

func (*Buffer) Delete 

func (b *Buffer) Delete()

Delete implements the gfx.Object interface.

func (*Buffer) Draw 

func (b *Buffer) Draw(p gfx.Primitive, first, count int)

Draw implements the gfx.Buffer interface.

func (*Buffer) Object 

func (b *Buffer) Object() interface{}

Object implements the gfx.Object interface.

func (*Buffer) SubDataFloat32 

func (b *Buffer) SubDataFloat32(offset int, data []float32)

SubDataFloat32 implements the gfx.Buffer interface.

func (*Buffer) SubDataFloat64 

func (b *Buffer) SubDataFloat64(offset int, data []float64)

SubDataFloat64 implements the gfx.Buffer interface.

func (*Buffer) SubDataInt16 

func (b *Buffer) SubDataInt16(offset int, data []int16)

SubDataInt16 implements the gfx.Buffer interface.

func (*Buffer) SubDataInt32 

func (b *Buffer) SubDataInt32(offset int, data []int32)

SubDataInt32 implements the gfx.Buffer interface.

func (*Buffer) SubDataInt8 

func (b *Buffer) SubDataInt8(offset int, data []int8)

SubDataInt8 implements the gfx.Buffer interface.

func (*Buffer) SubDataUint16 

func (b *Buffer) SubDataUint16(offset int, data []uint16)

SubDataUint16 implements the gfx.Buffer interface.

func (*Buffer) SubDataUint32 

func (b *Buffer) SubDataUint32(offset int, data []uint32)

SubDataUint32 implements the gfx.Buffer interface.

func (*Buffer) SubDataUint8 

func (b *Buffer) SubDataUint8(offset int, data []uint8)

SubDataUint8 implements the gfx.Buffer interface.

func (*Buffer) VertexAttribPointer 

func (b *Buffer) VertexAttribPointer(l gfx.AttribLocation, size int, normalized bool, stride, offset int)

VertexAttribPointer implements the gfx.Buffer interface.

type Context 

type Context struct {
	// O is literally the WebGLRenderingContext JavaScript object.
	O *js.Object
	state.Context

	// Enums maps a gfx enumeration to it's cooresponding OpenGL one.
	Enums [gfx.EnumMax]int

	LastBindFramebuffer  *js.Object
	LastBindRenderbuffer *js.Object
	LastBindBuffer       *js.Object
	LastUseProgram       *js.Object

	// WebGL error codes (see the Check method).
	NO_ERROR                      int `js:"NO_ERROR"`
	OUT_OF_MEMORY                 int `js:"OUT_OF_MEMORY"`
	INVALID_ENUM                  int `js:"INVALID_ENUM"`
	INVALID_OPERATION             int `js:"INVALID_OPERATION"`
	INVALID_FRAMEBUFFER_OPERATION int `js:"INVALID_FRAMEBUFFER_OPERATION"`
	INVALID_VALUE                 int `js:"INVALID_VALUE"`
	CONTEXT_LOST_WEBGL            int `js:"CONTEXT_LOST_WEBGL"`

	FRAMEBUFFER        int `js:"FRAMEBUFFER"`
	RENDERBUFFER       int `js:"RENDERBUFFER"`
	UNSIGNED_BYTE      int `js:"UNSIGNED_BYTE"`
	RGBA               int `js:"RGBA"`
	DEPTH_BUFFER_BIT   int `js:"DEPTH_BUFFER_BIT"`
	STENCIL_BUFFER_BIT int `js:"STENCIL_BUFFER_BIT"`
	COLOR_BUFFER_BIT   int `js:"COLOR_BUFFER_BIT"`
	COMPILE_STATUS     int `js:"COMPILE_STATUS"`
	LINK_STATUS        int `js:"LINK_STATUS"`
	UNSIGNED_SHORT     int `js:"UNSIGNED_SHORT"`
	FLOAT              int `js:"FLOAT"`

	// Framebuffer status codes (see the Framebuffer.Status method).
	FRAMEBUFFER_COMPLETE                      int `js:"FRAMEBUFFER_COMPLETE"`
	FRAMEBUFFER_INCOMPLETE_ATTACHMENT         int `js:"FRAMEBUFFER_INCOMPLETE_ATTACHMENT"`
	FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT int `js:"FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT"`
	FRAMEBUFFER_INCOMPLETE_DIMENSIONS         int `js:"FRAMEBUFFER_INCOMPLETE_DIMENSIONS"`
	FRAMEBUFFER_UNSUPPORTED                   int `js:"FRAMEBUFFER_UNSUPPORTED"`
	// contains filtered or unexported fields
}

Context implements the gfx.Context interface.

func (*Context) BlendColor 

func (c *Context) BlendColor(r, g, b, a float32) gfx.ContextStateValue

BlendColor implements the gfx.ContextStateProvider interface.

func (*Context) BlendEquation 

func (c *Context) BlendEquation(eq gfx.BlendEquation) gfx.ContextStateValue

BlendEquation implements the gfx.ContextStateProvider interface.

func (*Context) Check 

func (c *Context) Check()

Check implements the gfx.Context interface.

func (*Context) ColorMask 

func (c *Context) ColorMask(r, g, b, a bool) gfx.ContextStateValue

ColorMask implements the gfx.ContextStateProvider interface.

func (*Context) CullFace 

func (c *Context) CullFace(f gfx.Facet) gfx.ContextStateValue

CullFace implements the gfx.ContextStateProvider interface.

func (*Context) DepthMask 

func (c *Context) DepthMask(m bool) gfx.ContextStateValue

DepthMask implements the gfx.ContextStateProvider interface.

func (*Context) Disable 

func (c *Context) Disable(f gfx.Feature) gfx.ContextStateValue

Disable implements the gfx.ContextStateProvider interface.

func (*Context) Enable 

func (c *Context) Enable(f gfx.Feature) gfx.ContextStateValue

Enable implements the gfx.ContextStateProvider interface.

func (*Context) EnableVertexAttribArray 

func (c *Context) EnableVertexAttribArray(l gfx.AttribLocation) gfx.ContextStateValue

EnableVertexAttribArray implements the gfx.ContextStateProvider interface.

func (*Context) Finish 

func (c *Context) Finish()

Finish implements the gfx.Context interface.

func (*Context) Flush 

func (c *Context) Flush()

Flush implements the gfx.Context interface.

func (*Context) Framebuffer 

func (c *Context) Framebuffer() gfx.Framebuffer

Framebuffer implements the gfx.Context interface.

func (*Context) FrontFace 

func (c *Context) FrontFace(o gfx.Orientation) gfx.ContextStateValue

FrontFace implements the gfx.ContextStateProvider interface.

func (*Context) LineWidth 

func (c *Context) LineWidth(w float32) gfx.ContextStateValue

LineWidth implements the gfx.ContextStateProvider interface.

func (*Context) NewBuffer 

func (c *Context) NewBuffer(t gfx.BufferType) gfx.Buffer

NewBuffer implements the gfx.Buffer interface.

func (*Context) NewFramebuffer 

func (c *Context) NewFramebuffer() gfx.Framebuffer

NewFramebuffer implements the gfx.Context interface.

func (*Context) NewProgram 

func (c *Context) NewProgram() gfx.Program

NewProgram implements the gfx.Context interface.

func (*Context) NewRenderbuffer 

func (c *Context) NewRenderbuffer() gfx.Renderbuffer

NewRenderbuffer implements the gfx.Context interface.

func (*Context) NewShader 

func (c *Context) NewShader(t gfx.ShaderType) gfx.Shader

NewShader implements the gfx.Context interface.

func (*Context) NewTexture 

func (c *Context) NewTexture(t gfx.TextureType) gfx.Texture

NewTexture implements the gfx.Context interface.

func (*Context) Scissor 

func (c *Context) Scissor(x, y, width, height int) gfx.ContextStateValue

Scissor implements the gfx.ContextStateProvider interface.

func (*Context) UseProgram 

func (c *Context) UseProgram(p gfx.Program) gfx.ContextStateValue

UseProgram implements the gfx.ContextStateProvider interface.

func (*Context) Viewport 

func (c *Context) Viewport(x, y, width, height int) gfx.ContextStateValue

Viewport implements the gfx.ContextStateProvider interface.

type ContextAttributes 

type ContextAttributes struct {
	// If the value is true, the drawing buffer has an alpha channel for the
	// purposes of performing OpenGL destination alpha operations and
	// compositing with the page. If the value is false, no alpha buffer is
	// available.
	Alpha bool

	// If the value is true, the drawing buffer has a depth buffer of at least
	// 16 bits. If the value is false, no depth buffer is available.
	Depth bool

	// If the value is true, the drawing buffer has a stencil buffer of at
	// least 8 bits. If the value is false, no stencil buffer is available.
	Stencil bool

	// If the value is true and the implementation supports antialiasing the
	// drawing buffer will perform antialiasing using its choice of technique
	// (multisample/supersample) and quality. If the value is false or the
	// implementation does not support antialiasing, no antialiasing is
	// performed.
	Antialias bool

	// If the value is true the page compositor will assume the drawing buffer
	// contains colors with premultiplied alpha. If the value is false the page
	// compositor will assume that colors in the drawing buffer are not
	// premultiplied. This flag is ignored if the alpha flag is false.
	PremultipliedAlpha bool

	// If false, once the drawing buffer is presented as described in the
	// "Drawing Buffer" section, the contents of the drawing buffer are cleared
	// to their default values. All elements of the drawing buffer (color,
	// depth and stencil) are cleared. If the value is true the buffers will
	// not be cleared and will preserve their values until cleared or
	// overwritten by the author.
	//
	// On some hardware setting the preserveDrawingBuffer flag to true can have
	// significant performance implications.
	PreserveDrawingBuffer bool

	// Provides a hint to the implementation suggesting that, if possible, it
	// creates a context that optimizes for power consumption over performance.
	// For example, on hardware that has more than one GPU, it may be the case
	// that one of them is less powerful but also uses less power. An
	// implementation may choose to, and may have to, ignore this hint.
	PreferLowPowerToHighPerformance bool

	// If the value is true, context creation will fail if the implementation
	// determines that the performance of the created WebGL context would be
	// dramatically lower than that of a native application making equivalent
	// OpenGL calls. This could happen for a number of reasons, including:
	//
	// An implementation might switch to a software rasterizer if the user's
	// GPU driver is known to be unstable.
	//
	// An implementation might require reading back the framebuffer from GPU
	// memory to system memory before compositing it with the rest of the page,
	// significantly reducing performance.
	//
	// Applications that don't require high performance should leave this
	// parameter at its default value of false. Applications that require high
	// performance may set this parameter to true, and if context creation
	// fails then the application may prefer to use a fallback rendering path
	// such as a 2D canvas context. Alternatively the application can retry
	// WebGL context creation with this parameter set to false, with the
	// knowledge that a reduced-fidelity rendering mode should be used to
	// improve performance.
	FailIfMajorPerformanceCaveat bool
}

ContextAttributes is a set of drawing surface attributes passed to New.

func DefaultAttributes 

func DefaultAttributes() *ContextAttributes

DefaultAttributes returns a copy of the default context attributes.

type Framebuffer 

type Framebuffer struct {
	s.Framebuffer
	// contains filtered or unexported fields
}

Framebuffer implements the gfx.Framebuffer interface by wrapping a WebGLFramebuffer JavaScript object.

func (*Framebuffer) Clear 

func (f *Framebuffer) Clear(m gfx.ClearMask)

Clear implements the gfx.Framebuffer interface.

func (*Framebuffer) ClearColor 

func (f *Framebuffer) ClearColor(r, g, b, a float32) gfx.FramebufferStateValue

ClearColor implements the gfx.ContextStateProvider interface.

func (*Framebuffer) ClearDepth 

func (f *Framebuffer) ClearDepth(depth float64) gfx.FramebufferStateValue

ClearDepth implements the gfx.ContextStateProvider interface.

func (*Framebuffer) ClearStencil 

func (f *Framebuffer) ClearStencil(stencil int) gfx.FramebufferStateValue

ClearStencil implements the gfx.ContextStateProvider interface.

func (*Framebuffer) Delete 

func (f *Framebuffer) Delete()

Delete implements the gfx.Object interface.

func (*Framebuffer) Object 

func (f *Framebuffer) Object() interface{}

Object implements the gfx.Object interface.

func (*Framebuffer) ReadPixelsUint8 

func (f *Framebuffer) ReadPixelsUint8(x, y, width, height int, dst []uint8)

ReadPixelsUint8 implements the gfx.Framebuffer interface.

func (*Framebuffer) Renderbuffer 

func (f *Framebuffer) Renderbuffer(attachment gfx.FramebufferAttachment, buf gfx.Renderbuffer)

Renderbuffer implements the gfx.Framebuffer interface.

func (*Framebuffer) Status 

func (f *Framebuffer) Status() error

Status implements the gfx.Framebuffer interface.

func (*Framebuffer) Texture2D 

func (f *Framebuffer) Texture2D(attachment gfx.FramebufferAttachment, target gfx.TextureTarget, tex gfx.Texture)

Texture2D implements the gfx.Framebuffer interface.

type Program 

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

Program implements the gfx.Program interface by wrapping a WebGLProgram JavaScript object.

func (*Program) AttribLocation 

func (p *Program) AttribLocation(name string) gfx.AttribLocation

AttribLocation implements the gfx.Program interface.

func (*Program) Delete 

func (p *Program) Delete()

Delete implements the gfx.Object interface.

func (*Program) InfoLog 

func (p *Program) InfoLog() string

InfoLog implements the gfx.Program interface. 

func (p *Program) Link(vert, frag gfx.Shader) bool

Link implements the gfx.Program interface.

func (*Program) Object 

func (p *Program) Object() interface{}

Object implements the gfx.Object interface.

func (*Program) Uniform1fv 

func (p *Program) Uniform1fv(l gfx.UniformLocation, data []float32)

Uniform1fv implements the gfx.Program interface.

func (*Program) Uniform1iv 

func (p *Program) Uniform1iv(l gfx.UniformLocation, data []int32)

Uniform1iv implements the gfx.Program interface.

func (*Program) Uniform2fv 

func (p *Program) Uniform2fv(l gfx.UniformLocation, data []float32)

Uniform2fv implements the gfx.Program interface.

func (*Program) Uniform2iv 

func (p *Program) Uniform2iv(l gfx.UniformLocation, data []int32)

Uniform2iv implements the gfx.Program interface.

func (*Program) Uniform3fv 

func (p *Program) Uniform3fv(l gfx.UniformLocation, data []float32)

Uniform3fv implements the gfx.Program interface.

func (*Program) Uniform3iv 

func (p *Program) Uniform3iv(l gfx.UniformLocation, data []int32)

Uniform3iv implements the gfx.Program interface.

func (*Program) Uniform4fv 

func (p *Program) Uniform4fv(l gfx.UniformLocation, data []float32)

Uniform4fv implements the gfx.Program interface.

func (*Program) Uniform4iv 

func (p *Program) Uniform4iv(l gfx.UniformLocation, data []int32)

Uniform4iv implements the gfx.Program interface.

func (*Program) UniformLocation 

func (p *Program) UniformLocation(name string) gfx.UniformLocation

UniformLocation implements the gfx.Program interface.

func (*Program) UniformMatrix2fv 

func (p *Program) UniformMatrix2fv(l gfx.UniformLocation, transpose bool, data []float32)

UniformMatrix2fv implements the gfx.Program interface.

func (*Program) UniformMatrix3fv 

func (p *Program) UniformMatrix3fv(l gfx.UniformLocation, transpose bool, data []float32)

UniformMatrix3fv implements the gfx.Program interface.

func (*Program) UniformMatrix4fv 

func (p *Program) UniformMatrix4fv(l gfx.UniformLocation, transpose bool, data []float32)

UniformMatrix4fv implements the gfx.Program interface.

type Renderbuffer 

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

Renderbuffer implements the gfx.Renderbuffer interface by wrapping a WebGLRenderbuffer JavaScript object.

func (*Renderbuffer) Delete 

func (r *Renderbuffer) Delete()

Delete implements the gfx.Object interface.

func (*Renderbuffer) Object 

func (r *Renderbuffer) Object() interface{}

Object implements the gfx.Object interface.

func (*Renderbuffer) Storage 

func (r *Renderbuffer) Storage(internalFormat gfx.RenderbufferFormat, width, height int)

Storage implements the gfx.Renderbuffer interface.

type Shader 

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

Shader implements the gfx.Shader interface by wrapping a WebGLShader JavaScript object.

func (*Shader) Compile 

func (s *Shader) Compile(src string) bool

Compile implements the gfx.Shader interface.

func (*Shader) Delete 

func (s *Shader) Delete()

Delete implements the gfx.Object interface.

func (*Shader) InfoLog 

func (s *Shader) InfoLog() string

InfoLog implements the gfx.Shader interface.

func (*Shader) Object 

func (s *Shader) Object() interface{}

Object implements the gfx.Object interface.

type Texture 

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

Texture implements the gfx.Texture interface by wrapping a WebGLTexture JavaScript object.

func (*Texture) Delete 

func (t *Texture) Delete()

Delete implements the gfx.Object interface.

func (*Texture) Object 

func (t *Texture) Object() interface{}

Object implements the gfx.Object interface.

func (*Texture) Type 

func (t *Texture) Type() gfx.TextureType

Type implements the gfx.Texture interface.

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