graphicsdriver

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

type BlendFactor byte

type BlendOperation byte

type DstRegion struct {
	Region     Region
	IndexCount int
}

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)
	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 interface {
	ID() ImageID
	Dispose()
	IsInvalidated() bool
	ReadPixels(buf []byte, region image.Rectangle) error
	WritePixels(args []*WritePixelsArgs) error
}

type ImageID int

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

type Resetter interface {
	Reset() error
}

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

type ShaderID int

type WritePixelsArgs struct {
	Pixels []byte
	Region image.Rectangle
}