implemented spotlights

shader.fs

@@ -14,7 +14,9 @@ struct Material {
 struct Light{
      vec3 position; 
 
-    // vec3 direction; //  neccessary when using directional lights.
+     vec3 direction; //  neccessary when using directional lights or spotlights.
+     float cutoff;
+     float outerCutOff;
 
     vec3 ambient;
     vec3 diffuse;
@@ -39,6 +41,8 @@ uniform vec3 viewPos;
 
 void main()
 {
+  
+
     // ambient lighting calculation
     vec3 ambient =  light.ambient * vec3(texture(material.diffuse, TexCoords));
 
@@ -56,17 +60,29 @@ void main()
     float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
     vec3 specular = light.specular *  spec * vec3( texture(material.specular, TexCoords));
 
+
+
+    float theta = dot(lightDir, normalize(-light.direction));
+    float epsilon = light.cutoff - light.outerCutOff;
+    float intensity = clamp((theta - light.outerCutOff)/ epsilon, 0.0, 1.0);
+    
+
+    diffuse *= intensity;
+    specular *= intensity;
+
+    
     // calculate the attenuation
     float distance = length(light.position - FragPos);
     float attenuation = 1.0/ (light.constant + light.linear * distance + light.quadratic * (distance*distance));
 
 
+
     ambient *= attenuation;
     diffuse *= attenuation;
     specular *= attenuation;
 
   
-    // Calculate the result;
+
     vec3 result = ambient + diffuse + specular ;
 
     FragColor = vec4(result, 1.0);

src/main.cpp

@@ -258,13 +258,17 @@ while(!glfwWindowShouldClose(window))
 
 
 
-
-   shader.setVec3("light.direction", lightpos);
+   shader.setVec3("light.position", camera.Position);
+   shader.setVec3("light.direction", camera.Front);
+   shader.setFloat("light.cutoff", glm::cos(glm::radians(12.5f)));
+   shader.setFloat("light.outerCutOff", glm::cos(glm::radians(17.5f)));
 
    shader.setVec3("light.ambient", glm::vec3(0.2f, 0.2f, 0.2f));
    shader.setVec3("light.diffuse", glm::vec3(0.5f, 0.5f, 0.5f));
    shader.setVec3("light.specular", glm::vec3(1.0f, 1.0f, 1.0f));
    
+
+
    shader.setFloat("light.constant", 1.0f);
    shader.setFloat("light.linear", 0.09f);
    shader.setFloat("light.quadratic", 0.032f);