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ebiten: simplify the screen shader

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This commit is contained in:
Hajime Hoshi 2023-08-31 12:56:19 +09:00
parent ad2d8977b6
commit 0e1b73f94f
1 changed files with 5 additions and 10 deletions
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15
gameforui.go
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@ -29,9 +29,11 @@ const screenShaderSrc = `//kage:unit pixels
package main
func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
// Blend source colors in a square region, which size is 1/scale.
scale := imageDstSize()/imageSrc0Size()
pos := texCoord
p0 := pos - 1/2.0
p1 := pos + 1/2.0
p0 := pos - 1/2.0/scale
p1 := pos + 1/2.0/scale
// Texels must be in the source rect, so it is not necessary to check.
c0 := imageSrc0UnsafeAt(p0)
@ -40,14 +42,7 @@ func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
c3 := imageSrc0UnsafeAt(p1)
// p is the p1 value in one pixel assuming that the pixel's upper-left is (0, 0) and the lower-right is (1, 1).
p := fract(p1)
// rate indicates how much the 4 colors are mixed. rate is in between [0, 1].
//
// 0 <= p <= 1/scale: The rate is in between [0, 1]
// 1/scale < p: 1
scale := imageDstSize()/imageSrc0Size()
rate := clamp(p*scale, 0, 1)
rate := clamp(fract(p1), 0, 1)
return mix(mix(c0, c1, rate.x), mix(c2, c3, rate.x), rate.y)
}
`