graphics

Documentation

Overview

Package graphics represents a low layer for graphics using OpenGL.

Index

• Constants
• func FlushCommands() error
• func QuadVertexSizeInBytes() int
• func ResetGLState() error
• type Filter
• type Image
  • func NewImage(width, height int, filter Filter) *Image
  • func NewImageFromImage(img *image.RGBA, width, height int, filter Filter) *Image
  • func NewScreenFramebufferImage(width, height int, offsetX, offsetY float64) *Image
  • func (i *Image) Dispose()
  • func (i *Image) DrawImage(src *Image, vertices []float32, clr *affine.ColorM, mode opengl.CompositeMode)
  • func (i *Image) Fill(r, g, b, a uint8)
  • func (i *Image) IsInvalidated() bool
  • func (i *Image) Pixels() ([]byte, error)
  • func (i *Image) ReplacePixels(p []byte)
  • func (i *Image) Size() (int, int)

Constants

const MaxImageSize = defaultViewportSize

MaxImageSize is the maximum of width/height of an image.

Functions

func FlushCommands

func FlushCommands() error

FlushCommands flushes the command queue.

func QuadVertexSizeInBytes

func QuadVertexSizeInBytes() int

QuadVertexSizeInBytes returns the size in bytes of vertices for a quadrangle.

func ResetGLState

func ResetGLState() error

ResetGLState resets or initializes the current OpenGL state.

Types

type Filter

type Filter int

const (
	FilterNone Filter = iota
	FilterNearest
	FilterLinear
)

type Image

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

Image represents an image that is implemented with OpenGL.

func NewImage

func NewImage(width, height int, filter Filter) *Image

func NewImageFromImage

func NewImageFromImage(img *image.RGBA, width, height int, filter Filter) *Image

func NewScreenFramebufferImage

func NewScreenFramebufferImage(width, height int, offsetX, offsetY float64) *Image

func (*Image) Dispose

func (i *Image) Dispose()

func (*Image) DrawImage

func (i *Image) DrawImage(src *Image, vertices []float32, clr *affine.ColorM, mode opengl.CompositeMode)

func (*Image) Fill

func (i *Image) Fill(r, g, b, a uint8)

func (*Image) IsInvalidated

func (i *Image) IsInvalidated() bool

func (*Image) Pixels

func (i *Image) Pixels() ([]byte, error)

func (*Image) ReplacePixels

func (i *Image) ReplacePixels(p []byte)

func (*Image) Size

func (i *Image) Size() (int, int)