Version: v2.1.3 Latest Latest

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Published: Jul 6, 2021 License: Apache-2.0 Imports: 11 Imported by: 0



Package graphicscommand represents a low layer for graphics using OpenGL.



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func FlushCommands

func FlushCommands() error

FlushCommands flushes the command queue.

func MaxImageSize

func MaxImageSize() int

MaxImageSize returns the maximum size of an image.

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)

func SetMainThread

func SetMainThread(thread Thread)

SetMainThread must be called from the main thread (i.e, the goroutine where the thread is created).


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(srcs [graphics.ShaderImageNum]*Image, offsets [graphics.ShaderImageNum - 1][2]float32, vertices []float32, indices []uint16, clr *affine.ColorM, mode driver.CompositeMode, filter driver.Filter, address driver.Address, dstRegion, srcRegion driver.Region, shader *Shader, uniforms []interface{})

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: Color R [0.0-1.0]
5: Color G
6: Color B
7: Color Y

src and shader are exclusive and only either is non-nil.

The elements that index is in between 2 and 7 are used for the source images. The source image is 1) src argument if non-nil, or 2) an image value in the uniform variables if it exists. If there are multiple images in the uniform variables, the smallest ID's value is adopted.

If the source image is not specified, i.e., src is nil and there is no image in the uniform variables, the elements for the source image are not used.

func (*Image) Dump

func (i *Image) Dump(path string, blackbg bool) error

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

If blackbg is true, any alpha values in the dumped image will be 255.

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, error)

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)

type Shader

type Shader struct {
	// contains filtered or unexported fields

func NewShader

func NewShader(ir *shaderir.Program) *Shader

func (*Shader) Dispose

func (s *Shader) Dispose()

type Thread

type Thread interface {
	Call(f func() error) error

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