graphics

Documentation

Index

• Constants
• func CompileShader(src []byte) (*shaderir.Program, error)
• func InternalImageSize(x int) int
• func LockAndResetVertices(f func() error) error
• func QuadIndices() []uint16
• func QuadVertices(sx0, sy0, sx1, sy1 float32, a, b, c, d, tx, ty float32, cr, cg, cb, ca float32) []float32
• func Vertices(n int) []float32

Constants

const (
	ShaderImageCount = 4

	// PreservedUniformVariablesCount represents the number of preserved uniform variables.
	// Any shaders in Ebitengine must have these uniform variables.
	PreservedUniformVariablesCount = 1 +
		1 +
		1 +
		1 +
		1 +
		1 +
		1 +
		1 // the projection matrix

	TextureDestinationSizeUniformVariableIndex         = 0
	TextureSourceSizesUniformVariableIndex             = 1
	TextureDestinationRegionOriginUniformVariableIndex = 2
	TextureDestinationRegionSizeUniformVariableIndex   = 3
	TextureSourceOffsetsUniformVariableIndex           = 4
	TextureSourceRegionOriginUniformVariableIndex      = 5
	TextureSourceRegionSizeUniformVariableIndex        = 6
	ProjectionMatrixUniformVariableIndex               = 7
)

const (
	IndicesCount     = (1 << 16) / 3 * 3 // Adjust num for triangles.
	VertexFloatCount = 8
)

Functions

func CompileShader

func CompileShader(src []byte) (*shaderir.Program, error)

func InternalImageSize

func InternalImageSize(x int) int

InternalImageSize returns a nearest appropriate size as an internal image.

func LockAndResetVertices

func LockAndResetVertices(f func() error) error

func QuadIndices

func QuadIndices() []uint16

func QuadVertices

func QuadVertices(sx0, sy0, sx1, sy1 float32, a, b, c, d, tx, ty float32, cr, cg, cb, ca float32) []float32

QuadVertices returns a float32 slice for a quadrangle. QuadVertices returns a slice that never overlaps with other slices returned this function, and users can do optimization based on this fact.

func Vertices

func Vertices(n int) []float32

Vertices returns a float32 slice for n vertices. Vertices returns a slice that never overlaps with other slices returned this function, and users can do optimization based on this fact.