graphicsdriver

Documentation

Index

• Constants
• Variables
• type Blend
• type BlendFactor
• type BlendOperation
• type DstRegion
• type Graphics
• type Image
• type ImageID
• type Region
• type Shader
• type ShaderID
• type WritePixelsArgs

Constants

const (
	InvalidImageID  = 0
	InvalidShaderID = 0
)

Variables

var BlendClear = Blend{
	BlendFactorSourceRGB:        BlendFactorZero,
	BlendFactorSourceAlpha:      BlendFactorZero,
	BlendFactorDestinationRGB:   BlendFactorZero,
	BlendFactorDestinationAlpha: BlendFactorZero,
	BlendOperationRGB:           BlendOperationAdd,
	BlendOperationAlpha:         BlendOperationAdd,
}

var BlendCopy = Blend{
	BlendFactorSourceRGB:        BlendFactorOne,
	BlendFactorSourceAlpha:      BlendFactorOne,
	BlendFactorDestinationRGB:   BlendFactorZero,
	BlendFactorDestinationAlpha: BlendFactorZero,
	BlendOperationRGB:           BlendOperationAdd,
	BlendOperationAlpha:         BlendOperationAdd,
}

var BlendSourceOver = Blend{
	BlendFactorSourceRGB:        BlendFactorOne,
	BlendFactorSourceAlpha:      BlendFactorOne,
	BlendFactorDestinationRGB:   BlendFactorOneMinusSourceAlpha,
	BlendFactorDestinationAlpha: BlendFactorOneMinusSourceAlpha,
	BlendOperationRGB:           BlendOperationAdd,
	BlendOperationAlpha:         BlendOperationAdd,
}

var GraphicsNotReady = errors.New("graphics not ready")

GraphicsNotReady represents that the graphics driver is not ready for recovering from the context lost.

Types

type Blend

type Blend struct {
	BlendFactorSourceRGB        BlendFactor
	BlendFactorSourceAlpha      BlendFactor
	BlendFactorDestinationRGB   BlendFactor
	BlendFactorDestinationAlpha BlendFactor
	BlendOperationRGB           BlendOperation
	BlendOperationAlpha         BlendOperation
}

type BlendFactor

type BlendFactor byte

const (
	BlendFactorZero BlendFactor = iota
	BlendFactorOne
	BlendFactorSourceColor
	BlendFactorOneMinusSourceColor
	BlendFactorSourceAlpha
	BlendFactorOneMinusSourceAlpha
	BlendFactorDestinationColor
	BlendFactorOneMinusDestinationColor
	BlendFactorDestinationAlpha
	BlendFactorOneMinusDestinationAlpha
	BlendFactorSourceAlphaSaturated
)

type BlendOperation

type BlendOperation byte

const (
	BlendOperationAdd BlendOperation = iota
	BlendOperationSubtract
	BlendOperationReverseSubtract
)

type DstRegion

type DstRegion struct {
	Region     Region
	IndexCount int
}

type Graphics

type Graphics interface {
	Initialize() error
	Begin() error
	End(present bool) error
	SetTransparent(transparent bool)
	SetVertices(vertices []float32, indices []uint16) error
	NewImage(width, height int) (Image, error)
	NewScreenFramebufferImage(width, height int) (Image, error)
	SetVsyncEnabled(enabled bool)
	SetFullscreen(fullscreen bool)
	NeedsRestoring() bool
	NeedsClearingScreen() bool
	IsGL() bool
	IsDirectX() bool
	MaxImageSize() int

	NewShader(program *shaderir.Program) (Shader, error)

	// DrawTriangles draws an image onto another image with the given parameters.
	DrawTriangles(dst ImageID, srcs [graphics.ShaderImageCount]ImageID, shader ShaderID, dstRegions []DstRegion, indexOffset int, blend Blend, uniforms [][]uint32, evenOdd bool) error
}

type Image

type Image interface {
	ID() ImageID
	Dispose()
	IsInvalidated() bool
	ReadPixels(buf []byte, x, y, width, height int) error
	WritePixels(args []*WritePixelsArgs) error
}

type ImageID

type ImageID int

type Region

type Region struct {
	X      float32
	Y      float32
	Width  float32
	Height float32
}

type Shader

type Shader interface {
	ID() ShaderID
	Dispose()
}

type ShaderID

type ShaderID int

type WritePixelsArgs

type WritePixelsArgs struct {
	Pixels []byte
	X      int
	Y      int
	Width  int
	Height int
}