Implement flashlight

fragmentshader.txt

@@ -1,38 +1,57 @@
 #version 460 core
 out vec4 FragColor;
 
-in vec3 Normal;
+struct Material {
+    //sampler2D diffuse;
+    //sampler2D specular;
+    float shininess;
+    vec3 color;
+};
+
+struct Light {
+    vec3 position;
+    vec3 direction;
+    float largecutoff;
+    float smallcutoff;
+
+    vec3 ambient;
+    vec3 diffuse;
+    vec3 specular;
+};
+
 in vec3 FragPos;
+in vec3 Normal;
 
 uniform vec3 viewPos;
-uniform vec3 lightColor;
-uniform vec3 objectColor;
+uniform Material material;
+uniform Light light;
 
 void main()
 {
-    // ambient
-    float ambientStrength = 0.1;
-    vec3 ambient = ambientStrength * lightColor;
+    vec3 lightDir = normalize(light.position - FragPos);
 
-    vec3 vecDist = viewPos - FragPos;
-    vec3 normDist = normalize(vecDist);
+    // check if lighting is inside the spotlight cone
+    float theta = dot(lightDir, normalize(-light.direction));
 
+    float co = clamp((theta - light.largecutoff) / (light.smallcutoff - light.largecutoff), 0.0, 1.0);
     // diffuse
     vec3 norm = normalize(Normal);
-    vec3 lightDir = normDist;
     float diff = max(dot(norm, lightDir), 0.0);
-    vec3 diffuse = diff * lightColor;
+    vec3 diffuse = light.diffuse * diff * material.color * co;
 
     // specular
-    float specularStrength = 0.5;
-    vec3 viewDir = normDist;
+    vec3 viewDir = normalize(viewPos - FragPos);
     vec3 reflectDir = reflect(-lightDir, norm);
-    float spec = pow(max(dot(viewDir, reflectDir), 0.0), 8);
-    vec3 specular = specularStrength * spec * lightColor;
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+    vec3 specular = light.specular * spec * material.color * co;
 
-    float dist = distance(viewPos, FragPos);
-    float att = 1.0 / (1.0 + 0.1*dist + 0.01*dist*dist);
+    // attenuation
+    float distance    = length(light.position - FragPos);
+    float atten = 1.0 / (1.0 + 0.1 * distance + 0.01 * (distance * distance));
 
-    vec3 result = (ambient + diffuse + specular) * att * objectColor;
+    diffuse  *= atten;
+    specular *= atten;
+
+    vec3 result = light.ambient + diffuse + specular;
     FragColor = vec4(result, 1.0);
 }