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simpler light tone mapping

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This commit is contained in:
minjaesong
2024-02-03 15:13:33 +09:00
parent f91fbf6cf0
commit 808862c520
3 changed files with 49 additions and 57 deletions
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75
src/net/torvald/terrarum/worlddrawer/LightmapRenderer.kt
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@@ -17,9 +17,7 @@ import net.torvald.terrarum.modulebasegame.IngameRenderer
import net.torvald.terrarum.modulebasegame.ui.abs
import net.torvald.terrarum.realestate.LandUtil
import java.util.*
import kotlin.math.max
import kotlin.math.min
import kotlin.math.roundToInt
import kotlin.math.*
/**
* Sub-portion of IngameRenderer. You are not supposed to directly deal with this.
@@ -133,7 +131,6 @@ object LightmapRenderer {
}
init {
LightmapHDRMap.invoke()
printdbg(this, "Overscan open: $overscan_open; opaque: $overscan_opaque")
}
@@ -730,18 +727,18 @@ object LightmapRenderer {
/*lightBuffer.drawPixel(
x - this_x_start,
lightBuffer.height - 1 - y + this_y_start, // flip Y
(max(red,grnw,bluw,uvlwr) * solidMultMagic).hdnorm().times(255f).roundToInt().shl(24) or
(max(redw,grn,bluw,uvlwg) * solidMultMagic).hdnorm().times(255f).roundToInt().shl(16) or
(max(redw,grnw,blu,uvlwb) * solidMultMagic).hdnorm().times(255f).roundToInt().shl(8) or
(max(bluwv,uvl) * solidMultMagic).hdnorm().times(255f).roundToInt()
(max(red,grnw,bluw,uvlwr) * solidMultMagic).tonemap().times(255f).roundToInt().shl(24) or
(max(redw,grn,bluw,uvlwg) * solidMultMagic).tonemap().times(255f).roundToInt().shl(16) or
(max(redw,grnw,blu,uvlwb) * solidMultMagic).tonemap().times(255f).roundToInt().shl(8) or
(max(bluwv,uvl) * solidMultMagic).tonemap().times(255f).roundToInt()
)*/
lightBuffer.drawPixel(
x - this_x_start,
lightBuffer.height - 1 - y + this_y_start, // flip Y
(red * solidMultMagic).hdnorm().times(255f).roundToInt().shl(24) or
(grn * solidMultMagic).hdnorm().times(255f).roundToInt().shl(16) or
(blu * solidMultMagic).hdnorm().times(255f).roundToInt().shl(8) or
(uvl * solidMultMagic).hdnorm().times(255f).roundToInt()
(red * solidMultMagic).tonemap().times(255f).roundToInt().shl(24) or
(grn * solidMultMagic).tonemap().times(255f).roundToInt().shl(16) or
(blu * solidMultMagic).tonemap().times(255f).roundToInt().shl(8) or
(uvl * solidMultMagic).tonemap().times(255f).roundToInt()
)
}
}
@@ -764,7 +761,6 @@ object LightmapRenderer {
}
fun dispose() {
LightmapHDRMap.dispose()
_lightBufferAsTex.dispose()
lightBuffer.dispose()
@@ -846,26 +842,6 @@ object LightmapRenderer {
fun Int.even(): Boolean = this and 1 == 0
fun Int.odd(): Boolean = this and 1 == 1
// TODO: float LUT lookup using linear interpolation
// input: 0..1 for int 0..1023
fun hdr(intensity: Float): Float {
val intervalStart = (intensity / 4f * LightmapHDRMap.size).floorToInt()
val intervalEnd = (intensity / 4f * LightmapHDRMap.size).floorToInt() + 1
if (intervalStart == intervalEnd) return LightmapHDRMap[intervalStart]
val intervalPos = (intensity / 4f * LightmapHDRMap.size) - (intensity / 4f * LightmapHDRMap.size).toInt()
val ret = interpolateLinear(
intervalPos,
LightmapHDRMap[intervalStart],
LightmapHDRMap[intervalEnd]
)
return ret
}
private var _init = false
fun resize(screenW: Int, screenH: Int) {
@@ -901,16 +877,33 @@ object LightmapRenderer {
printdbg(this, "Resize event")
}
// private const val clip_p = 0.277777f // knee of around -1.94dB
private const val clip_p = 0.349f // knee of around -3.01dB
// private const val clip_p = 0.44444f // knee of around -6.02dB
private val clip_p1 = sqrt(1.0f - 2.0f * clip_p)
private val clip_lim = 1.0f / (1.0f + clip_p1)
/**
* https://www.desmos.com/calculator/syqd1byzzl
* @param x0 -0.5..0.5 ish
* @return -0.5..0.5
*/
private fun clipfun0(x0: Float): Float {
val x = x0 * (1.0f + clip_p1) / 2.0f
val t = 0.5f * clip_p1
/** To eliminated visible edge on the gradient when 255/1023 is exceeded */
fun Color.normaliseToHDR() = Color(
hdr(this.r.coerceIn(0f, 1f)),
hdr(this.g.coerceIn(0f, 1f)),
hdr(this.b.coerceIn(0f, 1f)),
hdr(this.a.coerceIn(0f, 1f))
)
if (x0.absoluteValue >= clip_lim) return 0.5f * sign(x0)
inline fun Float.hdnorm() = hdr(this.coerceIn(0f, 1f))
val y0 = if (x < -t)
(x*x + x + 0.25f) / clip_p - 0.5f
else if (x > t)
-(x*x - x + 0.25f) / clip_p + 0.5f
else
x * 2.0f * clip_lim
return y0
}
fun Float.tonemap() = clipfun0(this / 2f) * 2f
private fun Cvec.nonZero() = this.r.abs() > epsilon ||
this.g.abs() > epsilon ||