[DEV] tutorial 12 'specular lightning' implementation

src/engineTester/MainGameLoop.java

@@ -46,6 +46,8 @@ public class MainGameLoop {
 		ModelTexture texture = new ModelTexture(loader.loadTexture("white"));
 		
 		TexturedModel staticModel = new TexturedModel(model, texture);
+		texture.setShineDamper(10);
+		texture.setReflectivity(1);
 		
 		Entity entity = new Entity(staticModel, new Vector3f(0,0,-25), new Vector3f(0,0,0), 1);
 		Light light = new Light(new Vector3f(0,0,-20), new Vector3f(1,1,1));

src/renderEngine/Renderer.java

@@ -13,6 +13,7 @@ import entities.Entity;
 import models.RawModel;
 import models.TexturedModel;
 import shaders.StaticShader;
+import textures.ModelTexture;
 import toolbox.Maths;
 
 /**
@@ -50,6 +51,8 @@ public class Renderer {
 		GL20.glEnableVertexAttribArray(2);
 		Matrix4f transformationMatrix = Maths.createTransformationMatrix(entity.getPosition(), entity.getRotation(), entity.getScale());
 		shader.loadTransformationMatrix(transformationMatrix);
+		ModelTexture texture = texturedModel.getTexture();
+		shader.loadShineVariable(texture.getShineDamper(), texture.getReflectivity());
 		GL13.glActiveTexture(GL13.GL_TEXTURE0);
 		GL11.glBindTexture(GL11.GL_TEXTURE_2D, texturedModel.getTexture().getTexturedID());
 		GL11.glDrawElements(GL11.GL_TRIANGLES, rawModel.getVertexCount(), GL11.GL_UNSIGNED_INT, 0);

src/shaders/StaticShader.java

@@ -15,7 +15,9 @@ public class StaticShader extends ShaderProgram {
 	private int location_viewMatrix;
 	private int location_lightPosition;
 	private int location_lightColour;
-	
+	private int location_reflectivity;
+	private int location_shineDamper;
+
 	public StaticShader() {
 		super(VERTEX_FILE, FRAGMENT_FILE);
 	}
@@ -34,8 +36,14 @@ public class StaticShader extends ShaderProgram {
 		location_viewMatrix = super.getUniformLocation("viewMatrix");
 		location_lightPosition = super.getUniformLocation("lightPosition");
 		location_lightColour = super.getUniformLocation("lightColour");
+		location_reflectivity = super.getUniformLocation("reflectivity");
+		location_shineDamper = super.getUniformLocation("shineDamper");
 	}
-
+	public void loadShineVariable(float shineDamper, float reflectivity) {
+		super.loadFloat(location_reflectivity, reflectivity);
+		super.loadFloat(location_shineDamper, shineDamper);
+	}
+	
 	public void loadTransformationMatrix(Matrix4f matrix) {
 		super.loadMatrix(location_transformationMatrix, matrix);
 	}

src/shaders/fragmentShader.txt

@@ -3,11 +3,14 @@
 in vec2 pass_textureCoords;
 in vec3 surfaceNormal;
 in vec3 toLightVector;
+in vec3 toCameraVector;
 
 out vec4 out_Color;
 
 uniform sampler2D textureSampler;
 uniform vec3 lightColour;
+uniform float reflectivity;
+uniform float shineDamper;
 
 
 void main(void) {
@@ -19,6 +22,15 @@ void main(void) {
 	float brightness = max(nDot1, 0.0);
 	vec3 diffuse = brightness * lightColour;
 	
-	out_Color = vec4(diffuse,1.0) * texture(textureSampler,pass_textureCoords); 
+	vec3 unitVectorToCamera = normalize(toCameraVector);
+	vec3 lightDirection = -unitLightVector;
+	vec3 reflectedLightDirection = reflect(lightDirection, unitNormal);
+	
+	float specularFactor = dot(reflectedLightDirection, unitVectorToCamera);
+	specularFactor = max(specularFactor, 0.0);
+	float damperFactor = pow(specularFactor, shineDamper);
+	vec3 finalSpecular = damperFactor * reflectivity * lightColour;
+	
+	out_Color = vec4(diffuse,1.0) * texture(textureSampler,pass_textureCoords) + vec4(finalSpecular, 1.0); 
 }
 

src/shaders/vertexShader.txt

@@ -7,6 +7,7 @@ in vec3 normal;
 out vec2 pass_textureCoords;
 out vec3 surfaceNormal;
 out vec3 toLightVector;
+out vec3 toCameraVector;
 
 uniform mat4 transformationMatrix;
 uniform mat4 projectionMatrix;
@@ -20,5 +21,6 @@ void main(void) {
 	
 	surfaceNormal = (transformationMatrix * vec4(normal, 0.0)).xyz;
 	toLightVector = lightPosition - worldPosition.xyz;
+	toCameraVector = (inverse(viewMatrix) * vec4(0.0,0.0,0.0,1.0)).xyz - worldPosition.xyz;
 }
 

src/textures/ModelTexture.java

@@ -4,6 +4,11 @@ public class ModelTexture {
 
 	private int textureID;
 	
+	// Reflectivity of the light on the surface of the texture
+	private float reflectivity = 0;
+	// Distance of whitch the camera must to be to receive the the reflection
+	private float shineDamper = 1;
+	
 	public ModelTexture(int id) {
 		this.textureID = id;
 	}
@@ -11,5 +16,21 @@ public class ModelTexture {
 	public int getTexturedID() {
 		return textureID;
 	}
+
+	public float getReflectivity() {
+		return reflectivity;
+	}
+
+	public void setReflectivity(float reflectivity) {
+		this.reflectivity = reflectivity;
+	}
+
+	public float getShineDamper() {
+		return shineDamper;
+	}
+
+	public void setShineDamper(float shineDamper) {
+		this.shineDamper = shineDamper;
+	}
 	
 }