Merge pull request #30 from Pilzschaf/tutorial33-pointlight

Added old shader code

Author: Pilzschaf

shaders_old/basic.fs

@@ -18,8 +18,20 @@ struct DirectionalLight {
     vec3 ambient;
 };
 
+struct PointLight {
+    vec3 position;
+
+    vec3 diffuse;
+    vec3 specular;
+    vec3 ambient;
+
+    float linear;
+    float quadratic;
+};
+
 uniform Material u_material;
 uniform DirectionalLight u_directional_light;
+uniform PointLight u_point_light;
 
 void main()
 {
@@ -33,5 +45,13 @@ void main()
     vec3 diffuse = u_directional_light.diffuse * max(dot(normal, light), 0.0) * u_material.diffuse;
     vec3 specular = u_directional_light.specular * pow(max(dot(reflection, view), 0.000001), u_material.shininess) * u_material.specular;
 
+    light = normalize(u_point_light.position - v_position);
+    reflection = reflect(-light, normal);
+    float distance = length(u_point_light.position - v_position);
+    float attentuation = 1.0 / ((1.0) + (u_point_light.linear*distance) + (u_point_light.quadratic*distance*distance));
+    ambient += attentuation * u_point_light.ambient * u_material.diffuse;
+    diffuse += attentuation * u_point_light.diffuse * max(dot(normal, light), 0.0) * u_material.diffuse;
+    specular += attentuation * u_point_light.specular * pow(max(dot(reflection, view), 0.000001), u_material.shininess) * u_material.specular;
+
     gl_FragColor = vec4(ambient + diffuse + specular + u_material.emissive, 1.0f);
 }