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examples/shader: bug fix: wrong function usages

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The tex-coord should have been modified by the source texture
region/size, rather than the destination texture's.
This commit is contained in:
Hajime Hoshi 2022-10-14 16:04:04 +09:00
parent 4395d91c6b
commit 93c09633ee
1 changed files with 14 additions and 14 deletions
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28
examples/shader/crt.go
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@ -23,37 +23,37 @@ var ScreenSize vec2
func Fragment(position vec4, texCoord vec2, color vec4) vec4 { func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
const ( const (
BLURSCALEX = 0.45 blurScaleX = 0.45
LOWLUMSCAN = 5.0 lowLumScan = 5.0
HILUMSCAN = 10.0 hiLumScan = 10.0
BRIGHTBOOST = 1.25 BrightBoost = 1.25
MASK_DARK = 0.25 maskDark = 0.25
MASK_FADE = 0.8 maskFade = 0.8
) )
pos := texCoord pos := texCoord
origin, size := imageDstRegionOnTexture() origin, size := imageSrcRegionOnTexture()
pos -= origin pos -= origin
pos /= size pos /= size
maskFade := 0.3333 * MASK_FADE maskFade := 0.3333 * maskFade
invDims := 1.0 / imageDstTextureSize().xy invDims := 1.0 / imageSrcTextureSize().xy
p := pos * imageDstTextureSize() p := pos * imageSrcTextureSize()
i := floor(p) + 0.50 i := floor(p) + 0.50
f := p - i f := p - i
p = (i + 4.0*f*f*f) * invDims p = (i + 4.0*f*f*f) * invDims
p.x = mix(p.x, pos.x, BLURSCALEX) p.x = mix(p.x, pos.x, blurScaleX)
Y := f.y * f.y Y := f.y * f.y
YY := Y * Y YY := Y * Y
whichmask := fract(pos.x * -0.4999) whichmask := fract(pos.x * -0.4999)
mask := 1.0 mask := 1.0
if whichmask < 0.5 { if whichmask < 0.5 {
mask -= MASK_DARK mask -= maskDark
} }
clr := imageSrc2At(p*size + origin).rgb clr := imageSrc2At(p*size + origin).rgb
scanLineWeight := (BRIGHTBOOST - LOWLUMSCAN*(Y-2.05*YY)) scanLineWeight := (BrightBoost - lowLumScan*(Y-2.05*YY))
scanLineWeightB := 1.0 - HILUMSCAN*(YY-2.8*YY*Y) scanLineWeightB := 1.0 - hiLumScan*(YY-2.8*YY*Y)
return vec4(clr.rgb*mix(scanLineWeight*mask, scanLineWeightB, dot(clr.rgb, vec3(maskFade))), 1.0) return vec4(clr.rgb*mix(scanLineWeight*mask, scanLineWeightB, dot(clr.rgb, vec3(maskFade))), 1.0)
} }