mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 04:08:53 +01:00
57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
package shader
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import (
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"github.com/hajimehoshi/ebiten"
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)
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type textureQuad struct {
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VertexX1 float32
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VertexX2 float32
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VertexY1 float32
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VertexY2 float32
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TextureCoordU1 float32
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TextureCoordU2 float32
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TextureCoordV1 float32
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TextureCoordV2 float32
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}
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func NextPowerOf2(x uint64) uint64 {
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x -= 1
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x |= (x >> 1)
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x |= (x >> 2)
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x |= (x >> 4)
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x |= (x >> 8)
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x |= (x >> 16)
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x |= (x >> 32)
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return x + 1
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}
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func AdjustSizeForTexture(size int) int {
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return int(NextPowerOf2(uint64(size)))
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}
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func u(x int, width int) float32 {
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return float32(x) / float32(AdjustSizeForTexture(width))
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}
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func v(y int, height int) float32 {
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return float32(y) / float32(AdjustSizeForTexture(height))
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}
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func textureQuads(parts []ebiten.TexturePart, width, height int) []textureQuad {
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quads := []textureQuad{}
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for _, part := range parts {
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x1 := float32(part.LocationX)
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x2 := float32(part.LocationX + part.Source.Width)
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y1 := float32(part.LocationY)
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y2 := float32(part.LocationY + part.Source.Height)
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u1 := u(part.Source.X, width)
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u2 := u(part.Source.X+part.Source.Width, width)
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v1 := v(part.Source.Y, height)
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v2 := v(part.Source.Y+part.Source.Height, height)
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quad := textureQuad{x1, x2, y1, y2, u1, u2, v1, v2}
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quads = append(quads, quad)
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}
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return quads
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}
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