implemented fragment shader parallax occlusion mapping & add some assets to test it

src/main/kotlin/CustomDefaultShader.kt

@@ -3,6 +3,9 @@ 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.attributes.FloatAttribute
+import com.badlogic.gdx.graphics.g3d.attributes.TextureAttribute
+import com.badlogic.gdx.graphics.g3d.shaders.BaseShader
 import com.badlogic.gdx.graphics.g3d.shaders.DefaultShader
 
 class CustomDefaultShader(renderable: Renderable, config: Config):
@@ -18,6 +21,13 @@ class CustomDefaultShader(renderable: Renderable, config: Config):
 			renderable.environment.let { attribs.set(it) }
 			renderable.material.let { attribs.set(it) }
 
+			if (attribs.has(CustomFloatAttribute.BumpHeight) && attribs.has(TextureAttribute.Bump))
+			{
+				prefix += "#define " + CustomFloatAttribute.BumpHeightAlias + "Flag\n"
+				prefix += "#define " + TextureAttribute.BumpAlias + "Flag\n"
+				prefix += "#define " + TextureAttribute.BumpAlias + "Coord texCoord0\n"
+			}
+
 			if (attribs.has(ColorAttribute.Fog))
 			{
 				prefix += "#define fog${
@@ -50,6 +60,41 @@ class CustomDefaultShader(renderable: Renderable, config: Config):
 			val fogNear    = Uniform("u_fogNear")
 			val fogFar     = Uniform("u_fogFar")
 			val fogDensity = Uniform("u_fogDensity")
+
+			val bumpHeight = Uniform("u_bumpHeight")
+
+			val bumpTexture     = Uniform("u_bumpTexture")
+			val bumpUVTransform = Uniform("u_bumpUVTransform")
+		}
+
+		object Setters
+		{
+			val bumpHeight = object: LocalSetter()
+			{
+				override fun set(shader: BaseShader, inputId: Int, renderable: Renderable, combAttribs: Attributes)
+				{
+					val attr = combAttribs.get(CustomFloatAttribute.BumpHeight) as FloatAttribute
+					shader.set(inputId, attr.value)
+				}
+			}
+
+			val bumpTexture = object: LocalSetter()
+			{
+				override fun set(shader: BaseShader, inputId: Int, renderable: Renderable, combAttribs: Attributes)
+				{
+					val texAttr = combAttribs.get(TextureAttribute.Bump) as TextureAttribute
+					val unit = shader.context.textureBinder.bind(texAttr.textureDescription)
+					shader.set(inputId, unit)
+				}
+			}
+			var bumpUVTransform = object: LocalSetter()
+			{
+				override fun set(shader: BaseShader, inputId: Int, renderable: Renderable, combAttribs: Attributes)
+				{
+					val ta = combAttribs.get(TextureAttribute.Normal) as TextureAttribute
+					shader.set(inputId, ta.offsetU, ta.offsetV, ta.scaleU, ta.scaleV)
+				}
+			}
 		}
 	}
 
@@ -57,6 +102,10 @@ class CustomDefaultShader(renderable: Renderable, config: Config):
 	private val u_fogFar     = register(Inputs.fogFar)
 	private val u_fogDensity = register(Inputs.fogDensity)
 
+	private val u_bumpHeight     = register(Inputs.bumpHeight,       Setters.bumpHeight)
+	private val u_bumpTexture     = register(Inputs.bumpTexture,     Setters.bumpTexture)
+	private val u_bumpUVTransform = register(Inputs.bumpUVTransform, Setters.bumpUVTransform)
+
 	override fun bindLights(renderable: Renderable?, attributes: Attributes?)
 	{
 		if (attributes == null)

src/main/kotlin/CustomDefaultShaderProvider.kt

@@ -4,6 +4,7 @@ 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.attributes.TextureAttribute
 import com.badlogic.gdx.graphics.g3d.shaders.DefaultShader
 import com.badlogic.gdx.graphics.g3d.utils.DefaultShaderProvider
 
@@ -29,6 +30,11 @@ class CustomDefaultShaderProvider(config: DefaultShader.Config): DefaultShaderPr
 			CustomFloatAttribute.FogDensity
 		if ((renderableMask and ColorAttribute.Fog == ColorAttribute.Fog) && (renderableMask and fogMask != 0L))
 			return CustomDefaultShader(renderable, config)
+
+		val bumpMask = CustomFloatAttribute.BumpHeight or TextureAttribute.Bump
+		if (renderableMask and bumpMask == bumpMask)
+			return CustomDefaultShader(renderable, config)
+
 		return super.createShader(renderable)
 	}
 }

src/main/kotlin/CustomFloatAttribute.kt

@@ -17,5 +17,9 @@ class CustomFloatAttribute private constructor(type: Long, value: Float): FloatA
 		const val FogDensityAlias = "fogDensity"
 		val FogDensity = register(FogDensityAlias)
 		fun createFogDensity(value: Float) = CustomFloatAttribute(FogDensity, value)
+
+		const val BumpHeightAlias = "bumpHeight"
+		val BumpHeight = register(BumpHeightAlias)
+		fun createBumpHeight(value: Float) = CustomFloatAttribute(BumpHeight, value)
 	}
 }

src/main/kotlin/Game.kt

@@ -22,10 +22,10 @@ import ktx.math.times
 
 class Game: ApplicationAdapter()
 {
-	private lateinit var texJolk: Texture
 	private lateinit var fntComic: BitmapFont
 	private lateinit var cube: Model
 	private lateinit var floor: Model
+	private lateinit var toybox: Model
 
 	private lateinit var spriteBatch: SpriteBatch
 	private lateinit var modelBatch: ModelBatch
@@ -41,23 +41,17 @@ class Game: ApplicationAdapter()
 	private lateinit var suzanneInstance: ModelInstance
 	private lateinit var rockBatch: ModelCache
 	private lateinit var knux: ModelInstance
+	private lateinit var toyboxInstance: ModelInstance
 
-	private fun makeCube(texture: Texture): Model
+	private fun makeCube(size: Float, material: Material): Model
 	{
-		val modelBuilder = ModelBuilder()
-		val size = 2.0f
-		val material = Material(
-			ColorAttribute.createDiffuse(XnaColor.White),
-			TextureAttribute(TextureAttribute.Diffuse,
-				TextureDescriptor(texture,
-					Texture.TextureFilter.Linear,
-					Texture.TextureFilter.Linear,
-					Texture.TextureWrap.ClampToEdge,
-					Texture.TextureWrap.ClampToEdge)),
-			ColorAttribute.createSpecular(XnaColor.Gray),
-			FloatAttribute.createShininess(20.0f))
-		val attribs = VertexAttributes.Usage.Position or VertexAttributes.Usage.TextureCoordinates or VertexAttributes.Usage.Normal
-		return modelBuilder.createBox(size, size, size, material, attribs.toLong())
+		ModelBuilder().apply {
+			val attribs =
+				VertexAttributes.Usage.Position or
+				VertexAttributes.Usage.TextureCoordinates or
+				VertexAttributes.Usage.Normal
+			return createBox(size, size, size, material, attribs.toLong())
+		}
 	}
 
 	private fun makeFloor(size: Float): Model
@@ -103,8 +97,9 @@ class Game: ApplicationAdapter()
 				shininess = 65.0f
 				textures = Array()
 				textures.add(
-					modelTexture(ModelTexture.USAGE_DIFFUSE, "cobblestone.png"),
-					modelTexture(ModelTexture.USAGE_NORMAL, "cobblestone_normal.png"),
+					modelTexture(ModelTexture.USAGE_DIFFUSE,  "cobblestone.png"),
+					modelTexture(ModelTexture.USAGE_NORMAL,   "cobblestone_normal.png"),
+					modelTexture(ModelTexture.USAGE_BUMP,     "cobblestone_bump.png"),
 					modelTexture(ModelTexture.USAGE_SPECULAR, "cobblestone_specular.png"))
 			})
 			nodes.add(ModelNode().apply {
@@ -115,7 +110,9 @@ class Game: ApplicationAdapter()
 					materialId = "floormat"
 				})
 			})
-		}, AssetTextureProvider(assetManager))
+		}, AssetTextureProvider(assetManager)).apply {
+			materials[0].set(CustomFloatAttribute.createBumpHeight(0.0075f))
+		}
 	}
 
 	override fun create()
@@ -123,11 +120,20 @@ class Game: ApplicationAdapter()
 		Resources.instance.loadAssets()
 		assetManager.finishLoading()
 
-		texJolk = assetManager.get("jolkmeup.jpg")
 		fntComic = assetManager.get("Comic Sans MS.ttf")
 
-		cube = makeCube(texJolk)
-		var joeMany = 56.0f
+		cube = makeCube(2.0f, Material(
+			ColorAttribute.createDiffuse(XnaColor.White),
+			TextureAttribute(TextureAttribute.Diffuse, TextureDescriptor(assetManager.get("jolkmeup.jpg"))),
+			ColorAttribute.createSpecular(XnaColor.Gray),
+			FloatAttribute.createShininess(20.0f)))
+		toybox = assetManager.get("toybox.g3db", Model::class.java).apply { materials[0].set(
+			TextureAttribute(TextureAttribute.Diffuse, TextureDescriptor(assetManager.get("toybox_albedo.png"))),
+			TextureAttribute(TextureAttribute.Normal,  TextureDescriptor(assetManager.get("toybox_normal.png"))),
+			TextureAttribute(TextureAttribute.Bump,    TextureDescriptor(assetManager.get("toybox_displace.png"))),
+			CustomFloatAttribute.createBumpHeight(0.04f),
+			FloatAttribute.createShininess(35.0f)) }
+		val joeMany = 56.0f
 		floor = makeFloor(joeMany)
 
 		spriteBatch = SpriteBatch()
@@ -190,6 +196,7 @@ class Game: ApplicationAdapter()
 
 		suzanneInstance.transform = Matrix4().translate(3.0f, 1.0f, -3.5f)
 		knux = ModelInstance(assetManager.get("knux.g3db", Model::class.java))
+		toyboxInstance = ModelInstance(toybox)
 	}
 
 	override fun resize(width: Int, height: Int)
@@ -247,12 +254,19 @@ class Game: ApplicationAdapter()
 		knux.transform.rotate(Quaternion().slerp(rand.nextQuaternion(), deltaTime))
 		knux.transform.translate(knux.transform * Util.forward * deltaTime)
 
+		toyboxInstance.transform = Matrix4(
+			Vector3(6.0f, 0.667f, -3.5f),
+			Quaternion().setEulerAnglesRad(lightTheta * 0.5f, 0.0f, 0.0f),
+			Util.one * 0.25f
+		)
+
 		modelBatch.begin(colin.camera)
 		modelBatch.render(floorInstance, env)
 		modelBatch.render(rockBatch, env)
 		modelBatch.render(cubeInstance, env)
 		modelBatch.render(suzanneInstance, env)
 		modelBatch.render(knux, env)
+		modelBatch.render(toyboxInstance, env)
 		modelBatch.end()
 
 		spriteBatch.begin()

src/main/kotlin/Resources.kt

@@ -31,18 +31,25 @@ class Resources private constructor()
 		assetManager.setLoader(BitmapFont::class.java, ".ttf", FreetypeFontLoader(resolver))
 	}
 
-		val linearMipped = TextureLoader.TextureParameter().apply {
-			minFilter = Texture.TextureFilter.MipMapLinearLinear
-			magFilter = Texture.TextureFilter.Linear
-			wrapU = Texture.TextureWrap.Repeat
-			wrapV = Texture.TextureWrap.Repeat
-			genMipMaps = true
-		}
+	val linearMipped = TextureLoader.TextureParameter().apply {
+		minFilter = Texture.TextureFilter.MipMapLinearLinear
+		magFilter = Texture.TextureFilter.Linear
+		wrapU = Texture.TextureWrap.Repeat
+		wrapV = Texture.TextureWrap.Repeat
+		genMipMaps = true
+	}
+
+	val linearClamp = TextureLoader.TextureParameter().apply {
+		minFilter = Texture.TextureFilter.Linear
+		magFilter = Texture.TextureFilter.Linear
+		wrapU = Texture.TextureWrap.ClampToEdge
+		wrapV = Texture.TextureWrap.ClampToEdge
+	}
 
 	fun loadAssets()
 	{
 		assetManager.load("colin.png", Texture::class.java)
-		assetManager.load("jolkmeup.jpg", Texture::class.java)
+		assetManager.load("jolkmeup.jpg", Texture::class.java, linearClamp)
 		assetManager.loadFont("Comic Sans MS.ttf", 20)
 		assetManager.load("suzanne.g3db", Model::class.java)
 		assetManager.load("nut.wav", Sound::class.java)
@@ -51,6 +58,11 @@ class Resources private constructor()
 		assetManager.load("cobblestone_specular.png", Texture::class.java, linearMipped)
 		assetManager.load("rock.g3db", Model::class.java)
 		assetManager.load("knux.g3db", Model::class.java)
+		assetManager.load("toybox.g3db", Model::class.java)
+		assetManager.load("cobblestone_bump.png", Texture::class.java, linearMipped)
+		assetManager.load("toybox_albedo.png", Texture::class.java, linearMipped)
+		assetManager.load("toybox_normal.png", Texture::class.java, linearMipped)
+		assetManager.load("toybox_displace.png", Texture::class.java, linearMipped)
 	}
 }
 

src/main/resources/lit.frag.glsl

@@ -13,7 +13,7 @@ precision mediump float;
 varying vec3 v_normal;
 #endif // normalFlag
 
-#if defined(tangentFlag) && defined(binormalFlag)
+#if (defined(tangentFlag) && defined(binormalFlag)) || (defined(bumpHeightFlag) && defined(bumpTextureFlag))
 varying mat3 v_tbn;
 #endif // tangentFlag && bitangentFlag
 
@@ -28,6 +28,10 @@ varying vec4 v_color;
 varying MEDP vec2 v_diffuseUV;
 uniform sampler2D u_diffuseTexture;
 #endif // diffuseTextureFlag
+#ifdef bumpTextureFlag
+varying MEDP vec2 v_bumpUV;
+uniform sampler2D u_bumpTexture;
+#endif // bumpTextureFlag
 #ifdef normalTextureFlag
 varying MEDP vec2 v_normalUV;
 uniform sampler2D u_normalTexture;
@@ -60,6 +64,10 @@ uniform float u_shininess;
 const float u_shininess = 20.0;
 #endif // shininessFlag
 
+#ifdef bumpHeightFlag
+uniform float u_bumpHeight;
+#endif // bumpHeightFlag
+
 #if numDirectionalLights > 0
 struct DirectionalLight
 {
@@ -114,14 +122,30 @@ vec3 linearDecode(vec3 v) { return vec3(pow(v.r, 1.0 / 2.2), pow(v.g, 1.0 / 2.2)
 
 void main()
 {
+#if defined(specularFlag) || (defined(bumpHeightFlag) && defined(bumpTextureFlag))
+	vec3 eyeVec = normalize(u_cameraPosition.xyz - v_worldPosition.xyz);
+#endif // specularFlag || (bumpHeightFlag && bumpTextureFlag)
+
+#if defined(bumpHeightFlag) && defined(bumpTextureFlag)
+	float bumpHeight = (1.0 - texture2D(u_bumpTexture, v_bumpUV).r) * u_bumpHeight;
+	vec3 tbnEyeVec = normalize(mat3(
+		-v_tbn[0][0], v_tbn[1][0], v_tbn[2][0],
+		-v_tbn[0][1], v_tbn[1][1], v_tbn[2][1],
+		-v_tbn[0][2], v_tbn[1][2], v_tbn[2][2]
+	) * -eyeVec);
+	vec2 uvOffset = -tbnEyeVec.xy * bumpHeight;
+#else // !(bumpHeightFlag && bumpTextureFlag)
+	vec2 uvOffset = vec2(0.0);
+#endif // bumpHeightFlag && bumpTextureFlag
+
 #if defined(diffuseTextureFlag) && defined(diffuseColorFlag) && defined(colorFlag)
-	vec4 diffuse = texture2D(u_diffuseTexture, v_diffuseUV) * u_diffuseColor * v_color;
+	vec4 diffuse = texture2D(u_diffuseTexture, v_diffuseUV + uvOffset) * u_diffuseColor * v_color;
 #elif defined(diffuseTextureFlag) && defined(diffuseColorFlag)
-	vec4 diffuse = texture2D(u_diffuseTexture, v_diffuseUV) * u_diffuseColor;
+	vec4 diffuse = texture2D(u_diffuseTexture, v_diffuseUV + uvOffset) * u_diffuseColor;
 #elif defined(diffuseTextureFlag) && defined(colorFlag)
-	vec4 diffuse = texture2D(u_diffuseTexture, v_diffuseUV) * v_color;
+	vec4 diffuse = texture2D(u_diffuseTexture, v_diffuseUV + uvOffset) * v_color;
 #elif defined(diffuseTextureFlag)
-	vec4 diffuse = texture2D(u_diffuseTexture, v_diffuseUV);
+	vec4 diffuse = texture2D(u_diffuseTexture, v_diffuseUV + uvOffset);
 #elif defined(diffuseColorFlag) && defined(colorFlag)
 	vec4 diffuse = u_diffuseColor * v_color;
 #elif defined(diffuseColorFlag)
@@ -136,7 +160,7 @@ void main()
 #ifdef lightingFlag
 
 #if defined(normalFlag) && defined(tangentFlag) && defined(binormalFlag) && defined(normalTextureFlag)
-	vec3 normal = vec3(2.0 * texture2D(u_normalTexture, v_normalUV).rgb - 1.0);
+	vec3 normal = vec3(2.0 * texture2D(u_normalTexture, v_normalUV + uvOffset).rgb - 1.0);
 	normal = normalize(v_tbn * normal);
 #elif defined(normalFlag)
 	vec3 normal = normalize(v_normal);
@@ -149,7 +173,6 @@ void main()
 #endif // ambientFlag
 
 #ifdef specularFlag
-	vec3 eyeVec = normalize(u_cameraPosition.xyz - v_worldPosition.xyz);
 	vec3 specAccum = vec3(0.0);
 #endif // specularFlag
 
@@ -201,7 +224,7 @@ void main()
 	vec3 fragment;
 #ifdef specularFlag
 #ifdef specularTextureFlag
-	vec3 specularColorTex = texture2D(u_specularTexture, v_specularUV).rgb;
+	vec3 specularColorTex = texture2D(u_specularTexture, v_specularUV + uvOffset).rgb;
 	specularColorTex = linearEncode(specularColorTex);
 	specAccum *= specularColorTex;
 #endif // specularTextureFlag

src/main/resources/lit.vert.glsl

@@ -7,7 +7,7 @@ uniform mat3 u_normalMatrix;
 varying vec3 v_normal;
 #endif // normalFlag
 
-#if defined(tangentFlag) && defined(binormalFlag)
+#if (defined(tangentFlag) && defined(binormalFlag)) || (defined(bumpHeightFlag) && defined(bumpTextureFlag))
 attribute vec3 a_tangent;
 attribute vec3 a_binormal;
 varying mat3 v_tbn;
@@ -35,6 +35,11 @@ uniform vec4 u_diffuseUVTransform;
 varying vec2 v_diffuseUV;
 #endif // diffuseTextureFlag
 
+#ifdef bumpTextureFlag
+uniform vec4 u_bumpUVTransform;
+varying vec2 v_bumpUV;
+#endif // bumpTextureFlag
+
 #ifdef normalTextureFlag
 uniform vec4 u_normalUVTransform;
 varying vec2 v_normalUV;
@@ -104,6 +109,10 @@ void main()
 	v_diffuseUV = u_diffuseUVTransform.xy + a_texCoord0 * u_diffuseUVTransform.zw;
 #endif // diffuseTextureFlag
 
+#ifdef bumpTextureFlag
+	v_bumpUV = u_bumpUVTransform.xy + a_texCoord0 * u_bumpUVTransform.zw;
+#endif // bumpTextureFlag
+
 #ifdef normalTextureFlag
 	v_normalUV = u_normalUVTransform.xy + a_texCoord0 * u_normalUVTransform.zw;
 #endif // normalTextureFlag