From 02b8093bf0c09b838650f96d3d86be5d3231490e Mon Sep 17 00:00:00 2001
From: jvech <jmvalenciae@unal.edu.co>
Date: Thu, 3 Nov 2022 14:50:17 -0500
Subject: add: material and illumnation render implemented

shaders now render the models using ambient, diffuse and specular
properties and react to directional light.
---
 shaders/dummy.fsh | 36 +++++++++++++++++++++++++++++++++---
 shaders/dummy.vsh |  4 ++--
 2 files changed, 35 insertions(+), 5 deletions(-)

(limited to 'shaders')

diff --git a/shaders/dummy.fsh b/shaders/dummy.fsh
index 472bb26..75c7ef2 100644
--- a/shaders/dummy.fsh
+++ b/shaders/dummy.fsh
@@ -1,17 +1,47 @@
 #version 330 core
-
 struct Material {
     vec3 ambient;
     vec3 diffuse;
     vec3 specular;
+
     int illum;
     float Ns;
 };
 
-uniform Material mtl;
+struct DirLight {
+    vec3 direction;
+
+    vec3 ambient;
+    vec3 diffuse;
+    vec3 specular;
+};
+
 out vec4 FragColor;
 
+in vec3 FragPos;
+in vec3 Normal;
+in vec2 TexCoords;
+
+uniform vec3 viewPos;
+uniform DirLight dirLight;
+uniform Material mtl;
+
+
+
 void main()
 {
-    FragColor = vec4(mtl.diffuse, 1.0);
+    vec3 norm = normalize(Normal);
+    vec3 viewDir = normalize(viewPos - FragPos);
+
+    vec3 lightDir = normalize(-dirLight.direction);
+    float diff = max(dot(norm, lightDir), 0.0);
+
+    vec3 reflectDir = normalize(reflect(-lightDir, norm));
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), mtl.Ns);
+
+    vec3 ambient = dirLight.ambient * mtl.ambient;
+    vec3 diffuse = diff * dirLight.diffuse * mtl.diffuse;
+    vec3 specular = spec * dirLight.specular * mtl.specular;
+
+    FragColor = vec4(ambient + diffuse + specular, 1.0);
 }
diff --git a/shaders/dummy.vsh b/shaders/dummy.vsh
index bd540ab..d3a2082 100644
--- a/shaders/dummy.vsh
+++ b/shaders/dummy.vsh
@@ -15,6 +15,6 @@ void main()
 {
     gl_Position = proj * view * model * vec4(aPos, 1.0f);
     FragPos = vec3(model * vec4(aPos, 1.0));
-    //Normal = vec3(rotNormals * vec4(aNormal, 1.0));
-    //TexCoords = aTexCoords;
+    Normal = vec3(rotNormals * vec4(aNormal, 1.0));
+    TexCoords = aTexCoords;
 }
-- 
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