added basic lighting

resources/shaders/shader.fs

@@ -1,11 +1,32 @@
 #version 330 core
 out vec4 FragColor;
 
+in vec3 Normal;
 in vec2 TexCoords;
+in vec3 FragPos;
 
 uniform sampler2D texture_diffuse1;
+uniform vec3 lightColor;
+uniform vec3 lightPos;
+uniform vec3 viewPos;
 
 void main()
-{    
-    FragColor = texture(texture_diffuse1, TexCoords);
+{
+    float ambientStrength = 0.1;
+    vec3 ambient = ambientStrength * lightColor;
+
+    vec3 norm = normalize(Normal);
+    vec3 lightDir = normalize(lightPos - FragPos);
+    float diff = max(dot(norm, lightDir), 0.0);
+    vec3 diffuse = diff * lightColor;
+
+    float specularStrength = 0.5;
+    vec3 viewDir = normalize(viewPos - FragPos);
+    vec3 reflectDir = reflect(-lightDir, norm);  
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32);
+    vec3 specular = specularStrength * spec * lightColor;  
+
+    vec3 result = (ambient + diffuse + specular) * vec3(1.0, 0.5, 0.2);
+    vec4 light = vec4(result, 1.0);
+    FragColor = texture(texture_diffuse1, TexCoords) * light;
 }

resources/shaders/shader.vs

@@ -3,7 +3,9 @@ layout (location = 0) in vec3 aPos;
 layout (location = 1) in vec3 aNormal;
 layout (location = 2) in vec2 aTexCoords;
 
+out vec3 Normal;
 out vec2 TexCoords;
+out vec3 FragPos;
 
 uniform mat4 model;
 uniform mat4 view;
@@ -11,6 +13,8 @@ uniform mat4 projection;
 
 void main()
 {
-    TexCoords = aTexCoords;    
-    gl_Position = projection * view * model * vec4(aPos, 1.0);
+	TexCoords = aTexCoords;
+	Normal = mat3(transpose(inverse(model))) * aNormal;
+	FragPos = vec3(model * vec4(aPos, 1.0));
+	gl_Position = projection * view * model * vec4(aPos, 1.0);
 }