1 files changed, 33 insertions, 0 deletions
diff --git a/data/shaders/bump-poly.frag b/data/shaders/bump-poly.frag
new file mode 100644
index 0000000..ffd4c6c
--- /dev/null
+++ b/data/shaders/bump-poly.frag
@@ -0,0 +1,33 @@
+varying vec3 Normal;
+
+void main(void)
+{
+    const vec4 LightSourceAmbient = vec4(0.1, 0.1, 0.1, 1.0);
+    const vec4 LightSourceDiffuse = vec4(0.8, 0.8, 0.8, 1.0);
+    const vec4 LightSourceSpecular = vec4(0.8, 0.8, 0.8, 1.0);
+    const vec4 MaterialAmbient = vec4(1.0, 1.0, 1.0, 1.0);
+    const vec4 MaterialDiffuse = vec4(1.0, 1.0, 1.0, 1.0);
+    const vec4 MaterialSpecular = vec4(0.2, 0.2, 0.2, 1.0);
+    const float MaterialShininess = 100.0;
+
+    vec3 N = normalize(Normal);
+
+    // In the lighting model we are using here (Blinn-Phong with light at
+    // infinity, viewer at infinity), the light position/direction and the
+    // half vector is constant for the all the fragments.
+    vec3 L = normalize(LightSourcePosition.xyz);
+    vec3 H = normalize(LightSourceHalfVector);
+
+    // Calculate the diffuse color according to Lambertian reflectance
+    vec4 diffuse = MaterialDiffuse * LightSourceDiffuse * max(dot(N, L), 0.0);
+
+    // Calculate the ambient color
+    vec4 ambient = MaterialAmbient * LightSourceAmbient;
+
+    // Calculate the specular color according to the Blinn-Phong model
+    vec4 specular = MaterialSpecular * LightSourceSpecular *
+                    pow(max(dot(N,H), 0.0), MaterialShininess);
+
+    // Calculate the final color
+    gl_FragColor = ambient + specular + diffuse;
+}