graphics

Documentation

Overview

Package graphics represents a low layer for graphics using OpenGL.

Index

• func Error() error
• func FlushCommands()
• func MaxImageSize() int
• func ResetGLState() error
• func VertexSizeInBytes() int
• type Filter
• type Image
  • func NewImage(width, height int) *Image
  • func NewScreenFramebufferImage(width, height int) *Image
  • func (i *Image) Dispose()
  • func (i *Image) DrawImage(src *Image, vertices []float32, indices []uint16, clr *affine.ColorM, ...)
  • func (i *Image) IsInvalidated() bool
  • func (i *Image) Pixels() []byte
  • func (i *Image) ReplacePixels(p []byte, x, y, width, height int)
  • func (i *Image) Size() (int, int)

Functions

func Error

func Error() error

Error returns an OpenGL error for the last command.

func FlushCommands

func FlushCommands()

FlushCommands flushes the command queue.

func MaxImageSize

func MaxImageSize() int

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

func ResetGLState

func ResetGLState() error

ResetGLState resets or initializes the current OpenGL state.

func VertexSizeInBytes

func VertexSizeInBytes() int

VertexSizeInBytes returns the size in bytes of one vertex.

Types

type Filter

type Filter int

const (
	FilterDefault Filter = iota
	FilterNearest
	FilterLinear
	FilterScreen
)

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) *Image

func NewScreenFramebufferImage

func NewScreenFramebufferImage(width, height int) *Image

func (*Image) Dispose

func (i *Image) Dispose()

func (*Image) DrawImage

func (i *Image) DrawImage(src *Image, vertices []float32, indices []uint16, clr *affine.ColorM, mode opengl.CompositeMode, filter Filter)

func (*Image) IsInvalidated

func (i *Image) IsInvalidated() bool

func (*Image) Pixels

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

Pixels returns the image's pixels. Pixels might return nil when OpenGL error happens.

func (*Image) ReplacePixels

func (i *Image) ReplacePixels(p []byte, x, y, width, height int)

func (*Image) Size

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