examples/shader: add CRT shader example (#2012)

Closes #2008
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Bertrand Jung 2022-03-09 16:02:07 +01:00 committed by GitHub
parent 5e5e3c64ac
commit 2453f8f0df
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3 changed files with 62 additions and 0 deletions

56
examples/shader/crt.go Normal file
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@ -0,0 +1,56 @@
// Copyright 2022 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build ignore
// +build ignore
package main
var Time float
var Cursor vec2
var ScreenSize vec2
func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
const (
BLURSCALEX = 0.45
LOWLUMSCAN = 5.0
HILUMSCAN = 10.0
BRIGHTBOOST = 1.25
MASK_DARK = 0.25
MASK_FADE = 0.8
)
pos := texCoord
origin, size := imageDstRegionOnTexture()
pos -= origin
pos /= size
maskFade := 0.3333 * MASK_FADE
invDims := 1.0 / imageDstTextureSize().xy
p := pos * imageDstTextureSize()
i := floor(p) + 0.50
f := p - i
p = (i + 4.0*f*f*f) * invDims
p.x = mix(p.x, pos.x, BLURSCALEX)
Y := f.y * f.y
YY := Y * Y
whichmask := fract(pos.x * -0.4999)
mask := 1.0 + float(whichmask < 0.5)*-MASK_DARK
clr := imageSrc2At(p*size + origin).rgb
scanLineWeight := (BRIGHTBOOST - LOWLUMSCAN*(Y-2.05*YY))
scanLineWeightB := 1.0 - HILUMSCAN*(YY-2.8*YY*Y)
return vec4(clr.rgb*mix(scanLineWeight*mask, scanLineWeightB, dot(clr.rgb, vec3(maskFade))), 1.0)
}

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@ -0,0 +1,5 @@
// Code generated by file2byteslice. DO NOT EDIT.
package main
var crt_go = []byte("// Copyright 2022 The Ebiten Authors\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n// http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n//go:build ignore\r\n// +build ignore\r\n\r\npackage main\r\n\r\nvar Time float\r\nvar Cursor vec2\r\nvar ScreenSize vec2\r\n\r\nfunc Fragment(position vec4, texCoord vec2, color vec4) vec4 {\r\n\tconst (\r\n\t\tBLURSCALEX = 0.45\r\n\t\tLOWLUMSCAN = 5.0\r\n\t\tHILUMSCAN = 10.0\r\n\t\tBRIGHTBOOST = 1.25\r\n\t\tMASK_DARK = 0.25\r\n\t\tMASK_FADE = 0.8\r\n\t)\r\n\r\n\tpos := texCoord\r\n\torigin, size := imageDstRegionOnTexture()\r\n\tpos -= origin\r\n\tpos /= size\r\n\r\n\tmaskFade := 0.3333 * MASK_FADE\r\n\tinvDims := 1.0 / imageDstTextureSize().xy\r\n\tp := pos * imageDstTextureSize()\r\n\ti := floor(p) + 0.50\r\n\tf := p - i\r\n\tp = (i + 4.0*f*f*f) * invDims\r\n\tp.x = mix(p.x, pos.x, BLURSCALEX)\r\n\tY := f.y * f.y\r\n\tYY := Y * Y\r\n\twhichmask := fract(pos.x * -0.4999)\r\n\tmask := 1.0 + float(whichmask < 0.5)*-MASK_DARK\r\n\r\n\tclr := imageSrc2At(p*size + origin).rgb\r\n\tscanLineWeight := (BRIGHTBOOST - LOWLUMSCAN*(Y-2.05*YY))\r\n\tscanLineWeightB := 1.0 - HILUMSCAN*(YY-2.8*YY*Y)\r\n\r\n\treturn vec4(clr.rgb*mix(scanLineWeight*mask, scanLineWeightB, dot(clr.rgb, vec3(maskFade))), 1.0)\r\n}\r\n")

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@ -85,6 +85,7 @@ var shaderSrcs = [][]byte{
chromaticaberration_go, chromaticaberration_go,
dissolve_go, dissolve_go,
water_go, water_go,
crt_go,
} }
type Game struct { type Game struct {