1 files changed, 22 insertions, 0 deletions
diff --git a/src/render/shaders/es2/diffuse.frag b/src/render/shaders/es2/diffuse.frag
new file mode 100644
index 000000000..b9c7c8919
--- /dev/null
+++ b/src/render/shaders/es2/diffuse.frag
@@ -0,0 +1,22 @@
+#define FP highp
+
+uniform FP vec4 lightPosition;
+uniform FP vec3 lightIntensity;
+uniform FP vec3 kd; // Diffuse reflectivity
+uniform FP vec3 ka; // Ambient reflectivity
+
+varying FP vec3 position;
+varying FP vec3 normal;
+
+void main()
+{
+    // Calculate the vector from the light to the fragment
+    FP vec3 s = normalize( vec3( lightPosition ) - position );
+
+    // Calculate the diffuse lighting factor
+    FP vec3 n = normalize( normal );
+    FP float diffuse = max( dot( s, n ), 0.0 );
+
+    // Multiply by incoming light intensity
+    gl_FragColor = vec4( lightIntensity * (kd * diffuse + ka), 1.0 );
+}