graphicscommand

Documentation

Overview

Package graphicscommand represents a low layer for graphics using OpenGL.

Index

• func Error() error
• func FlushCommands()
• func NeedsRestoring() bool
• func ResetGraphicsDriverState() error
• func SetGraphicsDriver(driver driver.Graphics)
• type Image
  • func NewImage(width, height int) *Image
  • func NewScreenFramebufferImage(width, height int) *Image
  • func (i *Image) Dispose()
  • func (i *Image) DrawTriangles(src *Image, vertices []float32, indices []uint16, clr *affine.ColorM, ...)
  • func (i *Image) Dump(path string) error
  • func (i *Image) InternalSize() (int, int)
  • func (i *Image) IsInvalidated() bool
  • func (i *Image) Pixels() []byte
  • func (i *Image) ReplacePixels(pixels []byte, x, y, width, height 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 NeedsRestoring

func NeedsRestoring() bool

func ResetGraphicsDriverState

func ResetGraphicsDriverState() error

ResetGraphicsDriverState resets or initializes the current graphics driver state.

func SetGraphicsDriver

func SetGraphicsDriver(driver driver.Graphics)

Types

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

NewImage returns a new image.

Note that the image is not initialized yet.

func NewScreenFramebufferImage

func NewScreenFramebufferImage(width, height int) *Image

func (*Image) Dispose

func (i *Image) Dispose()

func (*Image) DrawTriangles

func (i *Image) DrawTriangles(src *Image, vertices []float32, indices []uint16, clr *affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address)

DrawTriangles draws triangles with the given image.

The vertex floats are:

0:  Destination X in pixels
1:  Destination Y in pixels
2:  Source X in pixels (not texels!)
3:  Source Y in pixels
4:  Bounds of the source min X in pixels
5:  Bounds of the source min Y in pixels
6:  Bounds of the source max X in pixels
7:  Bounds of the source max Y in pixels
8:  Color R [0.0-1.0]
9:  Color G
10: Color B
11: Color Y

func (*Image) Dump

func (i *Image) Dump(path string) error

Dump dumps the image to the specified path. In the path, '*' is replaced with the image's ID.

This is for testing usage.

func (*Image) InternalSize

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

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(pixels []byte, x, y, width, height int)