ebiten/graphics/graphics.go
2014-01-08 00:45:53 +09:00

42 lines
769 B
Go

package graphics
type Rect struct {
X int
Y int
Width int
Height int
}
type TexturePart struct {
LocationX int
LocationY int
Source Rect
}
type Filter int
const (
FilterNearest Filter = iota
FilterLinear
)
type TextureId int
// A render target is essentially same as a texture, but it is assumed that the
// all alpha of a render target is maximum.
type RenderTargetId int
func OrthoProjectionMatrix(left, right, bottom, top int) [4][4]float64 {
e11 := float64(2) / float64(right-left)
e22 := float64(2) / float64(top-bottom)
e14 := -1 * float64(right+left) / float64(right-left)
e24 := -1 * float64(top+bottom) / float64(top-bottom)
return [4][4]float64{
{e11, 0, 0, e14},
{0, e22, 0, e24},
{0, 0, 1, 0},
{0, 0, 0, 1},
}
}