19/20 is done so setup for day 21.

21-framebuffers/shaders/11-frag.glsl

@@ -0,0 +1,46 @@
+#version 330 core
+struct Material {
+  sampler2D diffuse;
+  sampler2D specular;
+  float shininess;
+};
+
+struct Light {
+  vec3 position;
+  vec3 diffuse;
+  vec3 specular;
+  vec3 ambient;
+};
+
+out vec4 FragColor;
+in vec3 FragPos;
+in vec3 Normal;
+in vec2 TexCoords;
+
+uniform vec3 viewPos;
+uniform Light light;
+uniform Material material;
+
+void main()
+{
+  vec3 mat_tex = vec3(texture(material.diffuse, TexCoords));
+  vec3 spec_tex = vec3(texture(material.specular, TexCoords));
+
+  vec3 ambient = light.ambient * mat_tex;
+
+  vec3 norm = normalize(Normal);
+  vec3 lightDir = normalize(light.position - FragPos);
+  float diff = max(dot(norm, lightDir), 0.0);
+  vec3 diffuse = light.diffuse * diff * mat_tex;
+
+  vec3 viewDir = normalize(viewPos - FragPos);
+  vec3 reflectDir = reflect(-lightDir, norm);
+
+  float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+
+  vec3 specular = light.specular * spec * spec_tex;
+
+  vec3 result = ambient + diffuse + specular;
+
+  FragColor = vec4(result, 1.0);
+}