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