more lighting

assets/shaders/basicFragment.frag

@@ -1,16 +1,56 @@
 #version 330 core
 out vec4 FragColor;
 
+in vec3 FragPos;
+in vec3 Normal;
 in vec2 TexCoord;
 
 uniform sampler2D ourTexture;
 uniform sampler2D decal;
 
-void main()
-{
+uniform vec3 lightPos;
+uniform vec3 lightColor;
+uniform vec3 viewPos;
+
+vec4 calcTextures(){
     vec4 tex1 = texture(ourTexture, TexCoord);
     vec4 tex2 = texture(decal, TexCoord);
     vec4 textures = mix(tex1, tex2, 0.2f);
 
-    FragColor = textures;
+    return textures;
+}
+
+vec4 calcDirectLight(norm, viewDir){
+    // Ambient Lighting
+    float ambientStrength = 0.1;
+    vec3 ambient = ambientStrength * lightColor;
+
+    // Diffuse Lighting
+    vec3 lightDir = normalize(lightPos - FragPos);
+
+    float diff = max(dot(norm, lightDir), 0.0);
+    vec3 diffuse = diff * lightColor;
+
+    // Specular Lighting
+    float specularStrength = 0.5;
+
+    vec3 reflectDir = reflect(-lightDir, norm);
+
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32);
+    vec3 specular = specularStrength * spec * lightColor;
+
+    vec4 result = vec4(ambient.rgb + diffuse.rgb + specular.rgb, 1.0f);
+
+    return result;
+}
+
+void main()
+{
+    vec3 norm = normalize(Normal);
+    vec3 viewDir = normalize(viewPos - FragPos);
+
+    vec4 result = calcTextures();
+    result += calcDirectLight(norm, viewDir);
+
+    FragColor = result;
 }