un-hardcode fog config

src/main/kotlin/CustomDefaultShader.kt

@@ -0,0 +1,71 @@
+package gay.pizza.CavesOfJolk
+
+import com.badlogic.gdx.graphics.g3d.Attributes
+import com.badlogic.gdx.graphics.g3d.Renderable
+import com.badlogic.gdx.graphics.g3d.attributes.ColorAttribute
+import com.badlogic.gdx.graphics.g3d.shaders.DefaultShader
+
+class CustomDefaultShader(renderable: Renderable, config: Config):
+	DefaultShader(renderable, config, createPrefix(renderable, config))
+{
+	companion object
+	{
+		fun createPrefix(renderable: Renderable, config: Config): String
+		{
+			var prefix = DefaultShader.createPrefix(renderable, config)
+
+			val attribs = Attributes()
+			renderable.environment.let { attribs.set(it) }
+			renderable.material.let { attribs.set(it) }
+
+			if (attribs.has(ColorAttribute.Fog))
+			{
+				prefix += "#define fog${
+					when (attribs.get<CustomIntAttribute>(CustomIntAttribute.FogMode)?.value
+							?: CustomIntAttribute.FogModes.Distance.toInt()) {
+						CustomIntAttribute.FogModes.Distance.toInt() -> "Distance"
+						CustomIntAttribute.FogModes.Depth.toInt()    -> "Depth"
+						else -> throw IndexOutOfBoundsException()
+					}
+				}Flag\n"
+				prefix += "#define fog${
+					when (attribs.get<CustomIntAttribute>(CustomIntAttribute.FogType)?.value
+							?: CustomIntAttribute.FogTypes.Original.toInt()) {
+						CustomIntAttribute.FogTypes.Original.toInt()  -> "Original"
+						CustomIntAttribute.FogTypes.Linear.toInt()    -> "Linear"
+						CustomIntAttribute.FogTypes.Smooth.toInt()    -> "Smooth"
+						CustomIntAttribute.FogTypes.InvSquare.toInt() -> "InvSquare"
+						CustomIntAttribute.FogTypes.Exp.toInt()       -> "Exp"
+						CustomIntAttribute.FogTypes.Exp2.toInt()      -> "Exp2"
+						else -> throw IndexOutOfBoundsException()
+					}
+				}Flag\n"
+			}
+
+			return prefix
+		}
+
+		object Inputs
+		{
+			val fogNear    = Uniform("u_fogNear")
+			val fogFar     = Uniform("u_fogFar")
+			val fogDensity = Uniform("u_fogDensity")
+		}
+	}
+
+	private val u_fogNear    = register(Inputs.fogNear)
+	private val u_fogFar     = register(Inputs.fogFar)
+	private val u_fogDensity = register(Inputs.fogDensity)
+
+	override fun bindLights(renderable: Renderable?, attributes: Attributes?)
+	{
+		if (attributes == null)
+			return
+
+		attributes.get<CustomFloatAttribute>(CustomFloatAttribute.FogNear)?.let { set(u_fogNear, it.value) }
+		attributes.get<CustomFloatAttribute>(CustomFloatAttribute.FogFar)?.let { set(u_fogFar, it.value) }
+		attributes.get<CustomFloatAttribute>(CustomFloatAttribute.FogDensity)?.let { set(u_fogDensity, it.value) }
+
+		super.bindLights(renderable, attributes)
+	}
+}

src/main/kotlin/CustomDefaultShaderProvider.kt

@@ -0,0 +1,34 @@
+package gay.pizza.CavesOfJolk
+
+import com.badlogic.gdx.Gdx
+import com.badlogic.gdx.graphics.g3d.Renderable
+import com.badlogic.gdx.graphics.g3d.Shader
+import com.badlogic.gdx.graphics.g3d.attributes.ColorAttribute
+import com.badlogic.gdx.graphics.g3d.shaders.DefaultShader
+import com.badlogic.gdx.graphics.g3d.utils.DefaultShaderProvider
+
+class CustomDefaultShaderProvider(config: DefaultShader.Config): DefaultShaderProvider(config)
+{
+	init
+	{
+		if (config.vertexShader == null)
+			config.vertexShader = Gdx.files.internal("lit.vert.glsl").readString()
+		if (config.fragmentShader == null)
+			config.fragmentShader = Gdx.files.internal("lit.frag.glsl").readString()
+	}
+
+	override fun createShader(renderable: Renderable): Shader
+	{
+		val renderableMask = renderable.environment.mask or renderable.material.mask
+
+		val fogMask =
+			CustomIntAttribute.FogMode or
+			CustomIntAttribute.FogType or
+			CustomFloatAttribute.FogNear or
+			CustomFloatAttribute.FogFar or
+			CustomFloatAttribute.FogDensity
+		if ((renderableMask and ColorAttribute.Fog == ColorAttribute.Fog) && (renderableMask and fogMask != 0L))
+			return CustomDefaultShader(renderable, config)
+		return super.createShader(renderable)
+	}
+}

src/main/kotlin/CustomFloatAttribute.kt

@@ -0,0 +1,21 @@
+package gay.pizza.CavesOfJolk
+
+import com.badlogic.gdx.graphics.g3d.attributes.FloatAttribute
+
+class CustomFloatAttribute private constructor(type: Long, value: Float): FloatAttribute(type, value)
+{
+	companion object
+	{
+		const val FogNearAlias = "fogNear"
+		val FogNear = register(FogNearAlias)
+		fun createFogNear(value: Float) = CustomFloatAttribute(FogNear, value)
+
+		const val FogFarAlias = "fogFar"
+		val FogFar = register(FogFarAlias)
+		fun createFogFar(value: Float) = CustomFloatAttribute(FogFar, value)
+
+		const val FogDensityAlias = "fogDensity"
+		val FogDensity = register(FogDensityAlias)
+		fun createFogDensity(value: Float) = CustomFloatAttribute(FogDensity, value)
+	}
+}

src/main/kotlin/CustomIntAttribute.kt

@@ -0,0 +1,37 @@
+package gay.pizza.CavesOfJolk
+
+import com.badlogic.gdx.graphics.g3d.attributes.IntAttribute
+
+class CustomIntAttribute private constructor(type: Long, value: Int): IntAttribute(type, value)
+{
+	enum class FogModes(private val value: Int)
+	{
+		Distance(0),
+		Depth(1);
+
+		fun toInt() = value
+	}
+
+	enum class FogTypes(private val value: Int)
+	{
+		Original(0),
+		Linear(1),
+		Smooth(2),
+		InvSquare(3),
+		Exp(4),
+		Exp2(5);
+
+		fun toInt() = value
+	}
+
+	companion object
+	{
+		const val FogModeAlias = "fogMode"
+		val FogMode = register(FogModeAlias)
+		fun createFogMode(value: FogModes) = CustomIntAttribute(FogMode, value.toInt())
+
+		const val FogTypeAlias = "fogType"
+		val FogType = register(FogTypeAlias)
+		fun createFogType(value: FogTypes) = CustomIntAttribute(FogType, value.toInt())
+	}
+}

src/main/kotlin/Game.kt

@@ -2,7 +2,6 @@ package gay.pizza.CavesOfJolk
 
 import com.badlogic.gdx.ApplicationAdapter
 import com.badlogic.gdx.Gdx
-import com.badlogic.gdx.audio.Sound
 import com.badlogic.gdx.graphics.*
 import com.badlogic.gdx.graphics.g2d.BitmapFont
 import com.badlogic.gdx.graphics.g2d.SpriteBatch
@@ -13,7 +12,6 @@ import com.badlogic.gdx.graphics.g3d.attributes.IntAttribute
 import com.badlogic.gdx.graphics.g3d.attributes.TextureAttribute
 import com.badlogic.gdx.graphics.g3d.environment.DirectionalLight
 import com.badlogic.gdx.graphics.g3d.shaders.DefaultShader
-import com.badlogic.gdx.graphics.g3d.utils.DefaultShaderProvider
 import com.badlogic.gdx.graphics.g3d.utils.ModelBuilder
 import com.badlogic.gdx.graphics.g3d.utils.TextureDescriptor
 import com.badlogic.gdx.math.*
@@ -24,7 +22,6 @@ class Game: ApplicationAdapter()
 {
 	private lateinit var texJolk: Texture
 	private lateinit var fntComic: BitmapFont
-	private lateinit var nut: Sound
 	private lateinit var cube: Model
 	private lateinit var floor: Model
 
@@ -95,18 +92,28 @@ class Game: ApplicationAdapter()
 		spriteBatch = SpriteBatch()
 
 		env = Environment()
-		env.set(IntAttribute.createCullFace(GL20.GL_BACK))
-		env.set(ColorAttribute.createAmbientLight(XnaColor.DarkSlateGray.lighten(-0.6)))
-		env.set(ColorAttribute.createFog(XnaColor.CornflowerBlue))
+		env.set(
+			IntAttribute.createCullFace(GL20.GL_BACK),
+			ColorAttribute.createAmbientLight(XnaColor.DarkSlateGray.lighten(-0.6)),
+			ColorAttribute.createFog(XnaColor.CornflowerBlue))
+		env.set(
+			CustomIntAttribute.createFogMode(CustomIntAttribute.FogModes.Depth),
+			CustomIntAttribute.createFogType(CustomIntAttribute.FogTypes.Smooth),
+			CustomFloatAttribute.createFogNear(0.75f),
+			CustomFloatAttribute.createFogFar(20.5f))
+		/*
+		env.set(
+			CustomIntAttribute.createFogMode(CustomIntAttribute.FogModes.Distance),
+			CustomIntAttribute.createFogType(CustomIntAttribute.FogTypes.Exp2),
+			CustomFloatAttribute.createFogDensity(0.1f))
+		 */
 		env.add(DirectionalLight().set(XnaColor.White, Vector3(1.0f, -1.0f, -1.0f).nor()))
 
-		val shaderConfig = DefaultShader.Config(
-			Gdx.files.internal("lit.vert.glsl").readString(),
-			Gdx.files.internal("lit.frag.glsl").readString())
+		val shaderConfig = DefaultShader.Config()
 		shaderConfig.numDirectionalLights = 1
 		shaderConfig.numPointLights = 0
 		shaderConfig.numBones = 0
-		modelBatch = ModelBatch(DefaultShaderProvider(shaderConfig))
+		modelBatch = ModelBatch(CustomDefaultShaderProvider(shaderConfig))
 
 		colin = Colin()
 
@@ -136,9 +143,7 @@ class Game: ApplicationAdapter()
 		val deltaTime = Gdx.graphics.deltaTime
 		update(deltaTime)
 
-		val fogColour = XnaColor.CornflowerBlue.lighten(Math.sin(0.056 * jolkRot.toDouble()) * 0.15 - 0.15)
-		ScreenUtils.clear(fogColour, true)
-		env.set(ColorAttribute.createFog(fogColour))
+		ScreenUtils.clear(XnaColor.CornflowerBlue, true)
 
 		val jolkPos = Vector3(0.0f, 1.0f + MathUtils.sin(jolkRot * 0.25f) * 0.25f, -4.0f)
 		val world = Matrix4()

src/main/kotlin/Util.kt

@@ -1,6 +1,8 @@
 package gay.pizza.CavesOfJolk
 
 import com.badlogic.gdx.graphics.Color
+import com.badlogic.gdx.graphics.g3d.Attribute
+import com.badlogic.gdx.graphics.g3d.Attributes
 import com.badlogic.gdx.math.MathUtils
 import com.badlogic.gdx.math.Vector2
 import ktx.math.div
@@ -58,3 +60,7 @@ fun Color.mix(rhs: Color, x: Float) = Color(
 	MathUtils.lerp(this.g, rhs.g, x),
 	MathUtils.lerp(this.b, rhs.b, x),
 	MathUtils.lerp(this.a, rhs.a, x))
+
+//FIXME: find some way to get rid of these warnings
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER", "UNCHECKED_CAST")
+fun <T: Attribute> Attributes.get(type: Long) = get(type) as? T

src/main/resources/lit.frag.glsl

@@ -88,7 +88,14 @@ uniform vec4 u_cameraPosition;
 
 #ifdef fogFlag
 uniform vec4 u_fogColor;
-varying float v_fog;
+
+#if defined(fogLinearFlag) || defined(fogSmoothFlag) || defined(fogInvSquareFlag)
+uniform float u_fogNear;
+uniform float u_fogFar;
+#elif defined(fogExpFlag) || defined(fogExp2Flag)
+uniform float u_fogDensity;
+#endif
+
 #endif // fogFlag
 
 uniform mat4 u_projViewTrans;
@@ -174,68 +181,42 @@ void main()
 	fragment = diffuse.rgb;
 #endif // lightingFlag
 
-#ifdef fogFlag
-#define fogDistance
-//#define fogDepth
+#ifdef fogOriginalFlag
+	vec3 fogVec = u_cameraPosition.xyz - v_worldPosition.xyz;
+	float fogDist = dot(fogVec, fogVec);
+	float fog = min(fogDist * u_cameraPosition.w, 1.0);
+#elif defined(fogDistanceFlag)
+	float fogDist = length(v_worldPosition.xyz - u_cameraPosition.xyz);
+#elif defined(fogDepthFlag)
+	float fogDist = gl_FragCoord.z / gl_FragCoord.w;
+#endif // fogOriginalFlag || fogDistanceFlag || fogDepthFlag
 
-//#define fogOriginal
-//#define fogLinear
-#define fogSmooth
-//#define fogInvSquare
-//#define fogExp
-//#define fogExp2
-
-#if defined(fogLinear) || defined(fogSmooth) || defined(fogInvSquare)
-	float near = 1.5;
-	float far = 20.5;
-#elif defined(fogExp) || defined(fogExp2)
-	float density = 0.12;
-#endif
-
-#ifdef fogOriginal
-	vec3 fvec = u_cameraPosition.xyz - v_worldPosition.xyz;
-	float flen = dot(fvec, fvec);
-	float fog = min(flen * u_cameraPosition.w, 1.0);
-#elif defined(fogDistance)
-	float flen = length(v_worldPosition.xyz - u_cameraPosition.xyz);
-#elif defined(fogDepth)
-	float flen = gl_FragCoord.z / gl_FragCoord.w;
-#endif // fogOriginal || fogDistance || fogDepth
-
-#ifdef fogLinear
+#ifdef fogLinearFlag
 	// fog = saturate(linearstep(near, far, x))
-	float fog = clamp((flen - near) / (far - near), 0.0, 1.0);
-#elif defined(fogSmooth)
+	float fog = clamp((fogDist - u_fogNear) / (u_fogFar - u_fogNear), 0.0, 1.0);
+#elif defined(fogSmoothFlag)
 	// fog = smoothstep(saturate(linearstep(near, far, x)))
-	float fog = clamp((flen - near) / (far - near), 0.0, 1.0);
+	float fog = clamp((fogDist - u_fogNear) / (u_fogFar - u_fogNear), 0.0, 1.0);
 	fog = fog * fog * (3.0 - 2.0 * fog);
 	//fog = fog * fog * fog * (fog * (6.0 * fog - 15.0) + 10.0);
-#elif defined(fogInvSquare)
+#elif defined(fogInvSquareFlag)
 	// fog = isqstep(saturate(linearstep(near, far, x)))
-	float fog = clamp((flen - near) / (far - near), 0.0, 1.0);
+	float fog = clamp((fogDist - u_fogNear) / (u_fogFar - u_fogNear), 0.0, 1.0);
 	fog = 1.0 - fog;
 	fog = 1.0 - fog * fog;
-#elif defined(fogExp)
-	float fog = max(1.0 - exp(-density * flen), 0.0);
-#elif defined(fogExp2)
-	float dz = density * flen;
+#elif defined(fogExpFlag)
+	// todo: can precompute some stuff in uniforms
+	float fog = max(1.0 - exp(-u_fogDensity * fogDist), 0.0);
+#elif defined(fogExp2Flag)
+	// todo: can precompute some stuff in uniforms
+	float dz = u_fogDensity * fogDist;
 	float fog = max(1.0 - exp(-dz * dz), 0.0);
-#endif // fogLinear || fogSmooth || fogInvSquare || fogExp || fogExp2
+#endif // fogLinearFlag || fogSmoothFlag || fogInvSquareFlag || fogExpFlag || fogExp2Flag
 
+#ifdef fogFlag
 	vec3 fogColor = u_fogColor.rgb;
 	fogColor = linearEncode(fogColor);
 	fragment = mix(fragment, fogColor, fog);
 #endif // fogFlag
 	gl_FragColor = vec4(linearDecode(fragment), diffuse.a);
-	/*
-	if (gl_FragCoord.x > 1280.0)
-	{
-		if (fog <= 0.0)
-			gl_FragColor = vec4(1.0, 0.0, 1.0, diffuse.a);
-		else if (fog >= 1.0)
-			gl_FragColor = vec4(1.0, 0.0, 0.0, diffuse.a);
-		else
-			gl_FragColor = vec4(fog, fog, 0.0, diffuse.a);
-	}
-	*/
 }