Added support for rendering multiple lights, standardized shaders to use snake case for variables and camel case for functions, stubbed PBR material shader include.

assets/shaders/fragment/lighting.glsl

@@ -1,22 +1,23 @@
 #version 330 core
-out vec4 FragColor;
+out vec4 frag_color;
 
 @include "light_struct"
 const int DIRECTIONAL = 0;
 const int POINT = 1;
 const int SPOT = 2;
 
-in vec2 outTexCoords;
-flat in Light outLight[1];
+flat in Light out_lights[7];
+in vec2 out_tex_coords;
+flat in int out_light_count;
 
 uniform sampler2D diffuse, position, texcoord, normal, depth;
 
 vec4 directionalLight(Light light) {
-  vec3 norm = normalize(texture(normal, outTexCoords).rgb);
-  vec3 diffuse_color = texture(diffuse, outTexCoords).rgb;
-  vec3 fragPos = texture(position, outTexCoords).rgb;
+  vec3 norm = normalize(texture(normal, out_tex_coords).rgb);
+  vec3 diffuse_color = texture(diffuse, out_tex_coords).rgb;
+  vec3 frag_pos = texture(position, out_tex_coords).rgb;
 
-  vec3 lightDir = normalize(light.position - fragPos);
+  vec3 lightDir = normalize(light.position - frag_pos);
   float diff = max(dot(norm, lightDir), 0);
 
   vec3 _ambient = light.ambient;
@@ -59,5 +60,10 @@ vec4 calculateLighting(Light light) {
 }
 
 void main() {
-  FragColor = texture(diffuse, outTexCoords) * calculateLighting(outLight[0]);
-}
+  frag_color = vec4(0.0);
+
+  for(int i = 0; i < out_light_count; i++)
+  {
+    frag_color += texture(diffuse, out_tex_coords) * calculateLighting(out_lights[i]);
+  }
+}