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skybox lut

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This commit is contained in:
minjaesong
2023-08-01 17:22:45 +09:00
parent 451808cd1c
commit 1ac861fa82
4 changed files with 23 additions and 19 deletions
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6
src/net/torvald/terrarum/modulebasegame/clut/GenerateSkyboxTextureAtlas.kt
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@@ -22,7 +22,7 @@ fun main() {
// y: increasing turbidity (1.0 .. 10.0, in steps of 0.333)
// x: elevations (-75 .. 75 in steps of 1, then albedo of [0.1, 0.3, 0.5, 0.7, 0.9])
val texh = Skybox.gradSize * Skybox.turbCnt
val texw = 2 * Skybox.elevCnt * 5
val texw = Skybox.elevCnt * Skybox.albedoCnt
val TGA_HEADER_SIZE = 18
val bytes = ByteArray(TGA_HEADER_SIZE + texw * texh * 4 + 26)
@@ -83,10 +83,10 @@ fun main() {
val rgb = xyz2.toRGB().toColor()
val colour = rgb.toIntBits().toLittle()
val imgOffX = 2 * (albedo0 * Skybox.elevCnt + elev0)
val imgOffX = (albedo0 * Skybox.elevCnt + elev0)
val imgOffY = texh - 1 - (Skybox.gradSize * turb0 + yp)
val fileOffset = TGA_HEADER_SIZE + 4 * (imgOffY * texw + imgOffX)
for (i in 0..7) {
for (i in 0..3) {
bytes[fileOffset + i] = colour[bytesLut[i]]
}
}

14
src/net/torvald/terrarum/modulebasegame/clut/Skybox.kt
View File

@@ -29,11 +29,13 @@ object Skybox : Disposable {
private lateinit var tex: Texture
private lateinit var texRegions: TextureRegionPack
private lateinit var texStripRegions: TextureRegionPack
fun loadlut() {
tex = Texture(ModMgr.getGdxFile("basegame", "weathers/main_skybox.png"))
tex.setFilter(Texture.TextureFilter.Linear, Texture.TextureFilter.Linear)
texRegions = TextureRegionPack(tex, 2, gradSize - 2, 0, 2, 0, 1)
texStripRegions = TextureRegionPack(tex, elevCnt - 2, gradSize - 2, 2, 2, 1, 1)
}
// use internal LUT
@@ -47,12 +49,18 @@ object Skybox : Disposable {
// use external LUT
operator fun get(elevationDeg: Double, turbidity: Double, albedo: Double): TextureRegion {
val elev = elevationDeg.coerceIn(-75.0, 75.0).roundToInt().plus(75)
val turb = turbidity.coerceIn(1.0, 10.0).minus(1.0).times(3.0).roundToInt()
val turb = turbidity.coerceIn(1.0, 10.0).minus(1.0).times(5.0).roundToInt()
val alb = albedo.coerceIn(0.1, 0.9).minus(0.1).times(5.0).roundToInt()
//printdbg(this, "elev $elevationDeg->$elev; turb $turbidity->$turb; alb $albedo->$alb")
return texRegions.get(alb * elevCnt + elev, turb)
}
fun getStrip(turbidity: Double, albedo: Double): TextureRegion {
val turb = turbidity.coerceIn(1.0, 10.0).minus(1.0).times(3.0).roundToInt()
val alb = albedo.coerceIn(0.1, 0.9).minus(0.1).times(5.0).roundToInt()
return texStripRegions.get(alb, turb)
}
private fun Float.scaleFun() =
(1f - 1f / 2f.pow(this/6f)) * 0.97f
@@ -82,8 +90,8 @@ object Skybox : Disposable {
val elevations = (0..150) //
val elevationsD = elevations.map { -75.0 + it } // -75, -74, -73, ..., 74, 75 // (specifically using whole number of angles because angle units any finer than 1.0 would make "hack" sunsut happen too fast)
val turbidities = (0..27) // 1, 1.333, 1.666, 2, 2,333, ... , 10.0
val turbiditiesD = turbidities.map { 1.0 + it / 3.0 }
val turbidities = (0..45) // 1, 1.2, 1.4, 1.6, ..., 10.0
val turbiditiesD = turbidities.map { 1.0 + it / 5.0 }
val albedos = arrayOf(0.1, 0.3, 0.5, 0.7, 0.9)
val elevCnt = elevations.count()
val turbCnt = turbidities.count()