1 files changed, 35 insertions, 0 deletions
diff --git a/data/shaders/ideas-logo.frag b/data/shaders/ideas-logo.frag
new file mode 100644
index 0000000..61b1d4f
--- /dev/null
+++ b/data/shaders/ideas-logo.frag
@@ -0,0 +1,35 @@
+uniform vec4 light0Position;
+varying vec3 vertex_normal;
+varying vec4 vertex_position;
+varying vec3 eye_direction;
+
+vec3 unitvec(vec4 v1, vec4 v2)
+{
+    if (v1.w == 0.0 && v2.w == 0.0)
+        return vec3(v2 - v1);
+    if (v1.w == 0.0)
+        return vec3(-v1);
+    if (v2.w == 0.0)
+        return vec3(v2);
+    return v2.xyz/v2.w - v1.xyz/v1.w;
+}
+
+void main()
+{
+    vec4 lightAmbient = vec4(0.0, 0.0, 0.0, 1.0);
+    vec4 lightDiffuse = vec4(1.0, 1.0, 1.0, 1.0);
+    vec4 lightSpecular = vec4(1.0, 1.0, 1.0, 1.0);
+    vec4 matAmbient = vec4(0.1, 0.1, 0.1, 1.0);
+    vec4 matDiffuse = vec4(0.5, 0.4, 0.7, 1.0);
+    vec4 matSpecular = vec4(1.0, 1.0, 1.0, 1.0);
+    float matShininess = 30.0;
+    vec3 light_direction = normalize(unitvec(vertex_position, light0Position));
+    vec3 normalized_normal = normalize(vertex_normal);
+    vec3 reflection = reflect(-light_direction, normalized_normal);
+    float specularTerm = pow(max(0.0, dot(reflection, eye_direction)), matShininess);
+    float diffuseTerm = max(0.0, dot(normalized_normal, light_direction));
+    vec4 specular = (lightSpecular * matSpecular);
+    vec4 ambient = (lightAmbient * matAmbient);
+    vec4 diffuse = (lightDiffuse * matDiffuse);
+    gl_FragColor = (specular * specularTerm) + ambient + (diffuse * diffuseTerm);
+}