Implemented basic materials in to the fragment shader..

shader.fs

@@ -4,9 +4,25 @@ out vec4 FragColor;
 in vec3 Normal;
 in vec3 FragPos;
 
-uniform vec3 objectColor;
+struct Material {
-uniform vec3 lightColor;
+    vec3 ambient;
-uniform vec3 lightPos;
+    vec3 diffuse;
+    vec3 specular;
+    float shininess;
+};
+
+struct Light{
+    vec3 position;
+
+    vec3 ambient;
+    vec3 diffuse;
+    vec3 specular;
+};
+
+uniform Light light;
+uniform Material material;
+
+
 uniform vec3 viewPos;
 
 
@@ -14,28 +30,25 @@ uniform vec3 viewPos;
 void main()
 {
     // ambient lighting calculation
-    float ambientStrength = 0.1;
+    vec3 ambient =  light.ambient * material.ambient;
-    vec3 ambient = ambientStrength * lightColor;
 
     // diffuse lighting calculation
     vec3 norm = normalize(Normal);
-    vec3 lightDir = normalize(lightPos - FragPos);
+    vec3 lightDir = normalize(light.position - FragPos);
 
     float diff = max(dot(norm, lightDir), 0.0);
-    vec3 diffuse = diff * lightColor;
+    vec3 diffuse =  light.diffuse * ( diff * material.diffuse);
 
-    // specular lighting
+    // specular lighting  
-    float specularStrength = 0.5;
-    float shininess = 32;
     vec3 viewDir = normalize(viewPos - FragPos);
     vec3 reflectDir = reflect(-lightDir, norm);
     
-    float spec = pow(max(dot(viewDir, reflectDir), 0.0), shininess);
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
-    vec3 specular = specularStrength * spec * lightColor;
+    vec3 specular = light.specular * ( spec * material.specular);
 
 
     // Calculate the result;
-    vec3 result = (ambient + diffuse + specular) * objectColor;
+    vec3 result = ambient + diffuse + specular ;
 
     FragColor = vec4(result, 1.0);
 }

src/main.cpp

@@ -196,9 +196,31 @@ while(!glfwWindowShouldClose(window))
    
    // draw cubes
    shader.use();
-   shader.setVec3("objectColor", glm::vec3( 1.0f, 0.5, 0.31f));
+   
-   shader.setVec3("lightColor",glm::vec3( 1.0f, 1.0f, 1.0f));
+   shader.setVec3("material.ambient", glm::vec3(1.0f, 0.5f, 0.31f));
-   shader.setVec3("lightPos", lightpos);
+   shader.setVec3("material.diffuse", glm::vec3(1.0f, 0.5f, 0.31f));
+   shader.setVec3("material.specular", glm::vec3(0.5, 0.5f, 0.5f));
+   shader.setFloat("material.shininess", 32.0f);
+
+
+   glm::vec3 lightColor;
+   lightColor.x = sin(glfwGetTime() * 2.0f);
+   lightColor.y = sin(glfwGetTime() * 0.7f);
+   lightColor.z = sin(glfwGetTime() * 1.3f);
+
+   glm::vec3 diffuseColor = lightColor * glm::vec3(0.5f);
+   glm::vec3 ambientColor = diffuseColor * glm::vec3(0.2f);
+
+
+
+   shader.setVec3("light.position", lightpos);
+
+   shader.setVec3("light.ambient", ambientColor);
+   shader.setVec3("light.diffuse", diffuseColor);
+   shader.setVec3("light.specular", glm::vec3(1.0f, 1.0f, 1.0f));
+   
+
+
    shader.setVec3("viewPos", camera.Position);
 
    shader.setMat4("view", view);