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examples/shader: bug fix: use pixels instead of texels for offsets

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Closes #2483
This commit is contained in:
Hajime Hoshi 2022-12-03 22:25:28 +09:00
parent 89c64f83e3
commit 760e6b9ebd
1 changed files with 6 additions and 4 deletions
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10
examples/shader/water.go
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@ -21,16 +21,18 @@ var Cursor vec2
var ScreenSize vec2 var ScreenSize vec2
func Fragment(position vec4, texCoord vec2, color vec4) vec4 { func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
border := ScreenSize.y*0.6 + 4*cos(Time*3+texCoord.y*200) srcsize := imageSrcTextureSize()
ypx := texCoord.y * srcsize.y
border := ScreenSize.y*0.6 + 4*cos(Time*3+ypx/10)
if position.y < border { if position.y < border {
return imageSrc2UnsafeAt(texCoord) return imageSrc2UnsafeAt(texCoord)
} }
srcsize := imageSrcTextureSize()
rorigin, _ := imageSrcRegionOnTexture() rorigin, _ := imageSrcRegionOnTexture()
xoffset := (4 / srcsize.x) * cos(Time*3+texCoord.y*200) xoffset := (4 / srcsize.x) * cos(Time*3+ypx/10)
yoffset := (20 / srcsize.y) * (1.0 + cos(Time*3+texCoord.y*50)) yoffset := (20 / srcsize.y) * (1.0 + cos(Time*3+ypx/40))
bordertex := border / srcsize.y bordertex := border / srcsize.y
clr := imageSrc2At(vec2( clr := imageSrc2At(vec2(
texCoord.x+xoffset, texCoord.x+xoffset,