omg ça marche

app/src/main/java/chess/view/DDDrender/shader/BoardShader.java

@@ -11,13 +11,19 @@ public class BoardShader extends ShaderProgram {
 			layout(location = 1) in vec3 color;
 
 			uniform mat4 camMatrix;
+			uniform vec3 lightPosition;
 
 			flat out vec3 pass_color;
+			out vec3 toLightVector;
 
 			void main(void){
 				gl_Position = camMatrix * vec4(position, 1.0);
+
+				toLightVector = lightPosition - position;
+
 				pass_color = color;
 			}
+
 				""";
 
 	private static String fragmentShader = """
@@ -25,11 +31,34 @@ public class BoardShader extends ShaderProgram {
 
 			flat in vec3 pass_color;
 
+			in vec3 toLightVector;
+
 			out vec4 out_color;
 
 			void main(void){
-				out_color = vec4(pass_color, 1.0);
+				const float shineDamper = 10.0;
+				const float reflectivity = 1.0;
+
+				float lightDistance = length(toLightVector);
+
+				const vec3 attenuation = vec3(0.3, 0.03, 0);
+				float attenuationFactor = attenuation.x + attenuation.y * lightDistance + attenuation.z * lightDistance * lightDistance;
+
+				vec3 unitNormal = vec3(0, 1, 0);
+				vec3 unitLightVector = normalize(toLightVector);
+
+				vec3 lightDirection = -unitLightVector;
+				vec3 reflectedLightDirection = reflect(lightDirection, unitNormal);
+
+				float diffuse = max(0.2, dot(unitNormal, unitLightVector));
+
+				float brightness = diffuse / attenuationFactor;
+
+				out_color = brightness * vec4(pass_color, 1.0);
+				out_color.w = 1.0;
+
 			}
+
 				""";
 
 	private int location_CamMatrix = 0;